[{"Question":"I have a django server running on my PC. I want to access the server through my android phone.How can I do that? I tried running \n\npython manage.py runserver 0.0.0.0:8000.\n\nAfter this, I can access server from my pc through PC's ip address, but not accessible through other device coonected to same wifi.","AnswerCount":4,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":9759,"Q_Id":42451790,"Users Score":0,"Answer":"A related issue I ran into was in relation to this error:\n\"code 400, message Bad HTTP\/0.9 request type ('\\***\\***\\***\\***\\***\\***\\***\\***\\***')\n[time stamp] You're accessing the development server over HTTPS, but it only supports HTTP\"\nJust verify that this is the reason you are not able to view also. Of course you would see this in your server messages if so.","Q_Score":4,"Tags":"android,python,django,networking","A_Id":44104349,"CreationDate":"2017-02-25T03:57:00.000","Title":"Accessing django localhost server through lan","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a django server running on my PC. I want to access the server through my android phone.How can I do that? I tried running \n\npython manage.py runserver 0.0.0.0:8000.\n\nAfter this, I can access server from my pc through PC's ip address, but not accessible through other device coonected to same wifi.","AnswerCount":4,"Available Count":2,"Score":1.0,"is_accepted":false,"ViewCount":9759,"Q_Id":42451790,"Users Score":6,"Answer":"can you try it python manage.py runserver youripadress:8000 [python manage.py runserver 192.168.0.1:8000]","Q_Score":4,"Tags":"android,python,django,networking","A_Id":42451815,"CreationDate":"2017-02-25T03:57:00.000","Title":"Accessing django localhost server through lan","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How to fix this error?\n\nTraceback (most recent call last):\n    File \"C:\/Users\/HP\/Downloads\/cv_api\/cv_api\/manage.py\", line 10, in \n      execute_from_command_line(sys.argv)\nFile \"F:\\Anaconda2Installation\\lib\\site-packages\\django-1.10.5-py2.7.egg\\django\\core\\management__init__.py\", line 367, in execute_from_command_line\n      utility.execute()\nFile \"F:\\Anaconda2Installation\\lib\\site-packages\\django-1.10.5-py2.7.egg\\django\\core\\management__init__.py\", line 316, in execute\n      settings.INSTALLED_APPS\nFile \"F:\\Anaconda2Installation\\lib\\site-packages\\django-1.10.5-py2.7.egg\\django\\conf__init__.py\", line 53, in getattr\n      self._setup(name)\nFile \"F:\\Anaconda2Installation\\lib\\site-packages\\django-1.10.5-py2.7.egg\\django\\conf__init__.py\", line 41, in _setup\n      self._wrapped = Settings(settings_module)\nFile \"F:\\Anaconda2Installation\\lib\\site-packages\\django-1.10.5-py2.7.egg\\django\\conf__init__.py\", line 97, in init\n      mod = importlib.import_module(self.SETTINGS_MODULE)\nFile \"F:\\Anaconda2Installation\\lib\\importlib__init__.py\", line 37, in import_module\nimport(name)\nImportError: No module named cv_api.settings","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":93,"Q_Id":42473069,"Users Score":0,"Answer":"You need to move your settings.py file to the cv_api directory.","Q_Score":1,"Tags":"python,django,opencv,django-views,django-rest-framework","A_Id":42482342,"CreationDate":"2017-02-26T19:22:00.000","Title":"How to fix Django Rest API error?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am attempting to deploy a Django project on AWS Elastic Beanstalk. One of my views makes use of Pandas to generate some data.\nI was able to get Pandas to compile properly on my EBS hosted site. I was noticing however that the browser would become \"hung\" when I tried to access any pages. I removed the view with the Pandas and the pandas import and the problem went away. However, when I add the Pandas import back, the problem recurs, leading me to believe it is a problem with Pandas. Also, if I remove the view that utilizes Pandas, but keep the \"import pandas\" statement, the problem remains. As soon as I remove \"import pandas as pd\" the problem goes away.\nWhen I SSH into the instance and run manage.py shell I can import Pandas properly and have no problems whatsoever - so I know Pandas has compiled properly. \nI checked the logs and nothing jumps out at me. Any help would be greatly appreciated!","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":202,"Q_Id":42473383,"Users Score":2,"Answer":"I've had problems using panda w\/django on a micro aws ec2 instance because of too little memory. Upgrading the instance solved the problem for me - \nIf you are using a t2.micro for example, i might be worth upgrading to a larger instance just to see if the problem magically disappears - like it did for me.\nPerhaps not a completely satisfactory answer, but t might help you narrow down the problem.","Q_Score":2,"Tags":"python,django,pandas,amazon-web-services,amazon-elastic-beanstalk","A_Id":42474523,"CreationDate":"2017-02-26T19:49:00.000","Title":"Django Pandas AWS","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I know that superusers and regular users are both just django's User objects, but how can I write a custom user class that requires some fields for plain users and doesn't require those fields for superusers?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":535,"Q_Id":42493384,"Users Score":1,"Answer":"You can have a profile class (say UserProfile) with foreign key to the user that is to be created only when user signs up using the website's registration form. That way, superuser which is created on admin site or through command line wouldn't need an extra profile instance attached to it.","Q_Score":2,"Tags":"python,django,python-2.7,django-models","A_Id":42494571,"CreationDate":"2017-02-27T18:40:00.000","Title":"In Django, is it possible for superusers to have different required fields than non-superusers?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I read a lot about the topic, but didn't find anything that sounded as satisfactory as an idea of mine, and also don't see why it would raise problems. So if you can give it a look...\nI want to change user authentication in mid-project, i.e. avoid using a custom user model, since this requires to be done before the first migration.\nCan I just modify the email field to editable=False in the django.contrib.user.models and add a modified save(), so the email is updated from the username? Or the other way round? Pro\nAnd another distict general question: Would I do such things in the venv, or can I copy the whole auth-folder as a local app?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":305,"Q_Id":42506097,"Users Score":2,"Answer":"Firstly, your title doesn't seem to have anything to do with your question; which is a good thing, because using email as a primary key is an incredibly bad idea. People change email addresses all the time, but a PK must stay constant.\nSecondly, you should absolutely not copy the contrib.auth code. Apart from anything else, this wouldn't solve your problems with the migrations, it would just make them worse. \nA much better solution would be add a pre-save signal on User, which you can do from anywhere in your project (ideally in an AppConfig ready method). And you don't need to change the model in order to make email uneditable; you should do that in the forms that use that model.","Q_Score":0,"Tags":"python,django,authentication","A_Id":42506251,"CreationDate":"2017-02-28T10:22:00.000","Title":"django user with email as pk - hack possible?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How to remove and add completly new db.sqlite3 database to django project written in pycharm?\nI did something wrong and I need completelty new database. The 'flush' command just removes data from databse but it't dosent remove tables schema. So the question is how to get get back my databse to begin point(no data, no sql table)","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1356,"Q_Id":42514902,"Users Score":4,"Answer":"A SQLite database is just a file. To drop the database, simply remove the file.\nWhen using SQLite, python manage.py migrate will automatically create the database if it doesn't exist.","Q_Score":1,"Tags":"python,sql,django","A_Id":42515036,"CreationDate":"2017-02-28T17:14:00.000","Title":"How to remove and add completly new db.sqlite3 to django project written in pycharm?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to start a Python 3.6 project by creating a virtualenv to keep the dependencies. I currently have both Python 2.7 and 3.6 installed on my machine, as I have been coding in 2.7 up until now and I wish to try out 3.6. I am running into a problem with the different versions of Python not detecting modules I am installing inside the virtualenv. \nFor example, I create a virtualenv with the command: virtualenv venv\nI then activate the virtualenv and install Django with the command: pip install django\nMy problems arise when I activate either Python 2.7 or 3.6 with the commands\npy -2 or py -3, neither of the interactive shells detect Django as being installed.\nDjango is only detected when I run the python command, which defaults to 2.7 when I want to use 3.6. Does anyone know a possible fix for this so I can get my virtualenv working correctly? Thanks! If it matters at all I am on a machine running Windows 7.","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":771,"Q_Id":42519094,"Users Score":0,"Answer":"The key is that pip installs things for a specific version of Python, and to a very specific location. Basically, the pip command in your virtual environment is set up specifically for the interpreter that your virtual environment is using. So even if you explicitly call another interpreter with that environment activated, it will not pick up the packages pip installed for the default interpreter.","Q_Score":0,"Tags":"python,pip,virtualenv","A_Id":42519225,"CreationDate":"2017-02-28T21:30:00.000","Title":"Virtualenv installing modules with multiple Python versions","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have changed the Odoo 10 login page title by using website builder app  but it does not work on the other pages after login. After login when I access different installed apps then the page title shows Odoo with apps name like \"Products - Odoo\" or \"Customers - Odoo\".","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":5989,"Q_Id":42526695,"Users Score":0,"Answer":"the funciton that change the tilte_part is :\n_title_changed in the js file : addons\/web\/static\/src\/js\/abstract_web_client.js\nit uses this.set('title_part', {\"zopenerp\": \"Odoo\"});\nso you can change the word odoo by something that you need. and costumize the order of the title in _title_changed to display it like what ever you want.","Q_Score":1,"Tags":"python,openerp,open-source,erp,odoo-10","A_Id":44158222,"CreationDate":"2017-03-01T08:27:00.000","Title":"How to change the title in Odoo 10?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have coded python to scrape a webpage and retrieve listing prices.\nI want to store the data and conduct a statistical analysis on the dataset. \nWould this work?\nPython -> beautifulsoup -> mySQL -> html\nData set:\n$10 , $20, $10\nI want to be able to calculate averages and then display them on the html page.","AnswerCount":3,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":475,"Q_Id":42527324,"Users Score":0,"Answer":"If you are using the data for normal use you can store it in sqlite db instead of mysql which has inbuilt support from python. If your site is mostly static then you can use Beautifulsoup for scraping and there are lot of python libraries like numpy for statistical analysis. If your target site has dynamically generated content then better use phantomjs or selenium driver to retrieve those contents","Q_Score":0,"Tags":"python,html,mysql,beautifulsoup","A_Id":42529552,"CreationDate":"2017-03-01T08:59:00.000","Title":"Scrape and store data for html display","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have coded python to scrape a webpage and retrieve listing prices.\nI want to store the data and conduct a statistical analysis on the dataset. \nWould this work?\nPython -> beautifulsoup -> mySQL -> html\nData set:\n$10 , $20, $10\nI want to be able to calculate averages and then display them on the html page.","AnswerCount":3,"Available Count":3,"Score":0.0665680765,"is_accepted":false,"ViewCount":475,"Q_Id":42527324,"Users Score":1,"Answer":"You could stay in Python for the analysis (for example with Python Pandas dataframes) before storing in mySQL:\nPython -> Beautifulsoup -> pandas -> mySQL -> html","Q_Score":0,"Tags":"python,html,mysql,beautifulsoup","A_Id":42527517,"CreationDate":"2017-03-01T08:59:00.000","Title":"Scrape and store data for html display","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have coded python to scrape a webpage and retrieve listing prices.\nI want to store the data and conduct a statistical analysis on the dataset. \nWould this work?\nPython -> beautifulsoup -> mySQL -> html\nData set:\n$10 , $20, $10\nI want to be able to calculate averages and then display them on the html page.","AnswerCount":3,"Available Count":3,"Score":0.0665680765,"is_accepted":false,"ViewCount":475,"Q_Id":42527324,"Users Score":1,"Answer":"Beautifulsoup is an HTML parser. You can feed it an HTML page using Python, and extract the data you need from it. Then you can post-process the data in Python, and load it into MySQL once you're ready. I'm a bit confused about the step MySQL -> HTML, since neither is a programming language (HTML is a markup language that can't talk to MySQL, and MySQL is a database management system that can't directly output HTML), but sure, displaying MySQL data in an HTML page is a trivial step.\nIt might be a good idea to separate these steps a bit better, by the way. You have some code that extracts data and loads it into a database, and you have some code that displays data from the database. Keeping these two separated might increase you code quality.","Q_Score":0,"Tags":"python,html,mysql,beautifulsoup","A_Id":42527571,"CreationDate":"2017-03-01T08:59:00.000","Title":"Scrape and store data for html display","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I noticed that Django use double under score to define a lookup in Model.objects.filter instance.\nFor example:\nRoom.objects.filter(width__lte = 10)\nHow does it work? How can I create my own function like Django and know that width__lte is actually separated for width and lower then or equal to 10.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2764,"Q_Id":42544689,"Users Score":2,"Answer":"Thanks to answers below I found the answer to my question:\nDjango have a const LOOKUP_SEP = '__' then using split to split the param to a key value pair","Q_Score":4,"Tags":"python,django,django-models,syntax","A_Id":42545133,"CreationDate":"2017-03-02T00:22:00.000","Title":"How does django implement double underscore in filter?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have been adding items from a txt to my database in a djago-view - with and without the @transaction.atomic-decorator, i.e. with a loop over db-writes or one db-write -- the performance difference is near infinite!^^\nNow my observation: the default delete-action in the admin panel clearly does the (inferior) loop over db-wirtes. Which takes really long for deleting 1000 entries. \nWhy is this, is there a reason, am I missing something?!\nOr should I fix this and open a pull request ;) (would be my first oss-contribution :))\nAs mentioned in the first answer, there is a confirmation step between chosing the action and the actual delete. But even after the confirmation it takes several minutes (for a few thousand entries) to delete the items, during which the database is locked, so there is no way back at that point...","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":299,"Q_Id":42552650,"Users Score":1,"Answer":"When doing a bulk delete, neither the models delete() methods nor the eventual pre_delete and post_delete signals are invoked, so if your code relies on either of those you are in trouble. Hence the very sensible choice to loop over instances and call their delete() method individually. No need to report it as a bug (nor to submit a patch), it's actually a feature ;)","Q_Score":0,"Tags":"python,django,database","A_Id":42555104,"CreationDate":"2017-03-02T10:18:00.000","Title":"django built-in admin action delete - reason for bad performance?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"requests.exceptions.Timeout  VS \nrequests.models.Response.status_code = 504 [gateway timeout]\nwhat is the actual difference between the two as both deals with saying timeout has occurred?\nLet us say Service s1 makes call to S2\nIn s1:\nrequest.post( url=s2,..., timeout=60 ) \nwhen will requests.exceptions.Timeout  be raised and in what scenario 504 is received.\nCan retries be made for all of those exceptions  - I believe answer for above question might give lead to this..\nThanks in advance.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1354,"Q_Id":42558294,"Users Score":0,"Answer":"The gateway timeout means the connected server had some sort of timeout after receiving your request(i.e. you did make a connection).  However, the requests timeout exception means your script never connected to the server and timed out waiting on a response from the server (i.e. you did not make a connection).","Q_Score":1,"Tags":"python,python-2.7,request,timeoutexception,http-status-code-504","A_Id":42558358,"CreationDate":"2017-03-02T14:38:00.000","Title":"python: requests.exceptions.Timeout vs requests.models.Response.status_code 504 ( gateway timeout )","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to Python scripting and I am currently trying to get acquainted with python scripting and DigSILENT Powerfactory. \nI have managed thus far to execute powerfactory, activate projects and execute a load flow but after my code ends, when I try to rerun it, it wont run. In order for it to run I need to close Spyder and reopen it. I believe this is related to the fact that powerfactory is still running in the background so I was wondering if there is any command that \"forces\" powerfactory to shut down after the code execution. \nAny tip would be greatly appreciated :)","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":826,"Q_Id":42582399,"Users Score":0,"Answer":"you could try this:\napp.PostCommand(\"exit\")","Q_Score":2,"Tags":"python-3.x,python-3.4","A_Id":55909536,"CreationDate":"2017-03-03T15:11:00.000","Title":"How can I exit powerfactory using Python in Unattended mode?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to Python scripting and I am currently trying to get acquainted with python scripting and DigSILENT Powerfactory. \nI have managed thus far to execute powerfactory, activate projects and execute a load flow but after my code ends, when I try to rerun it, it wont run. In order for it to run I need to close Spyder and reopen it. I believe this is related to the fact that powerfactory is still running in the background so I was wondering if there is any command that \"forces\" powerfactory to shut down after the code execution. \nAny tip would be greatly appreciated :)","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":826,"Q_Id":42582399,"Users Score":0,"Answer":"I had the same problem. But faster than shutdown\/reopen spyder is to restart the kernel with ctrl + .","Q_Score":2,"Tags":"python-3.x,python-3.4","A_Id":43653385,"CreationDate":"2017-03-03T15:11:00.000","Title":"How can I exit powerfactory using Python in Unattended mode?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a page View-Consult with 4 bootstrap tabs.\nThere are two entities retrieved from the Datastore on this page (Consult and Assessment). The consult is created first and the assessment later (by a different user).\nNote: Consults have a property called \"consult_status\" that is PENDING before the Assessment is added, and COMPLETED after. This may be useful as a condition.\nThe properties from the Consult populate the first 3 bootstrap tabs. The Assessment properties are displayed in the 4th tab.\nThere will be a period where the Assessment has not been completed and the View-Consult page will need to display a message in the 4th tab saying \"This consult is currently awaiting assessment. You will be notified by email when it is complete.\"\nHow would I create and test for this condition and render the appropriate output inside tab 4, depending if the Assessment is complete or not.\nNote also: The Consult and Assessment have the same ID, so perhaps a better condition would be to check if there exists an Assignment with the current Consult ID. If not display message \"awaiting assessment\".","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":29,"Q_Id":42597497,"Users Score":0,"Answer":"When rendering the page just check if the assessment exists by retrieving it from the Consult (I imagine you store the assessment key inside the Consult).\nThat's it","Q_Score":0,"Tags":"twitter-bootstrap,python-2.7,google-app-engine,google-cloud-datastore,app-engine-ndb","A_Id":43709266,"CreationDate":"2017-03-04T15:05:00.000","Title":"Appengine Python - How to filter tab content depending if entity has been created","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a web server using NodeJS - Express and I have a Scikit-Learn (machine learning) model pickled (dumped) in the same machine.\nWhat I need is to demonstrate the model by sending\/receiving data from it to the server. I want to load the model on startup of the web server and keep \"listening\" for data inputs. When receive data, executes a prediction and send it back.\nI am relatively new to Python. From what I've seen I could use a \"Child Process\" to execute that. I also saw some modules that run Python script from Node. \nThe problem is I want to load the model once and let it be for as long as the server is on. I don't want to keep loading the model every time due to it's size. How is the best way to perform that?\nThe idea is running everything in a AWS machine.\nThank you in advance.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":3643,"Q_Id":42610590,"Users Score":6,"Answer":"My recommendation: write a simple python web service (personally recommend flask) and deploy your ML model. Then you can easily send requests to your python web service from your node back-end. You wouldn't have a problem with the initial model loading. it is done once in the app startup, and then you're good to go\nDO NOT GO FOR SCRIPT EXECUTIONS AND CHILD PROCESSES!!! I just wrote it in bold-italic all caps so to be sure you wouldn't do that. Believe me... it potentially go very very south, with all that zombie processes upon job termination and other stuff. let's just simply say it's not the standard way to do that.\nYou need to think about multi-request handling. I think flask now has it by default\nI am just giving you general hints because your problem has been generally introduced.","Q_Score":11,"Tags":"python,node.js,scikit-learn,child-process","A_Id":62075227,"CreationDate":"2017-03-05T16:02:00.000","Title":"Sklearn Model (Python) with NodeJS (Express): how to connect both?","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Good day. \nI'm a newbie to Django and I have a slight confusion:\nWhen deploying my Django app, do I need to deploy it with all the Python 'come-with' modules, or the hosts already have them installed. \nAlso, I installed PIL for image manipulation. Would they also have it installed or i have to find a way to install it on their servers. Thanks in advance","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":28,"Q_Id":42615538,"Users Score":1,"Answer":"do I need to deploy it with all the Python 'come-with' modules\n\nNever do that. It might conflict with the dependencies on the server. Instead issue the following command to create a dependency file (requirements.txt).\npip freeze > requirements.txt (issue this command where manage.py is located)\nOn the server create a new virtual environment. Now copy django project to the server (you can do this using git clone or just plain old Filezilla). Activate virtual environment. Then change you current working directory to the where manage.py is located. to install all the dependencies issue the following command.\npip install -r requirements.txt\nThis will install the required dependencies on on server.","Q_Score":0,"Tags":"django,python-3.x","A_Id":42618333,"CreationDate":"2017-03-05T23:56:00.000","Title":"confusion in deploying module's with django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We have asynchronous python application (telegram bot), and we want to add localization: user selects language when he starts dialog with bot, then bot translates all messages for him.\nDjango allows to change language for every request, it is working normally, because Django create separate process for each request. But it will not work in async bot \u2014 there is only one process and we should handle multiple users with different languages inside of it.\nWe can do simple thing \u2014 store user's preferences in Database, load the preferred language from DB with each incoming message, and them pass this settings to all inside functions \u2014 but it is quite complicated, because our bot is complex and there can be more than dozen included function calls.\nHow we can implement language switching in the asynchronous application with elegant way?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":703,"Q_Id":42619597,"Users Score":0,"Answer":"Okay, we solved problem using with that provide us with context to all inner function calls.","Q_Score":2,"Tags":"python,asynchronous,localization,internationalization,gettext","A_Id":42623529,"CreationDate":"2017-03-06T07:13:00.000","Title":"Localization for Async Python Telegram bot","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Basically, I would like to deploy a web2py application with a set of default users already registered\/created in the application. \nCan this be accomplished by importing a CSV file containing default username\/password and other details into the auth_user table?  \nAny help is welcome.\nThanks.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":183,"Q_Id":42620942,"Users Score":0,"Answer":"If you want to do it manually, just:\n\ngo to your application admin interface\nclick on the \"database admin\" button (mighy be translated to your OS language)\nclick on db.auth_user\nthen use the Import\/Export feature form at the bottom of the page\n\nThat's it.","Q_Score":0,"Tags":"python,web2py","A_Id":42701682,"CreationDate":"2017-03-06T08:36:00.000","Title":"Creating default set of username\/password from a csv file in a web2py application","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am getting CSRF verification failed when i return to back go back after login using django method.\nIt returns the sign in page even after i successfully log in. And it posts the error as CSRF verification failed.\nCould I use to set anything in Django setting?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":528,"Q_Id":42625724,"Users Score":0,"Answer":"The CSRF token is rotated after the user logs in. If the user goes back in their browser after logging in and submits a form with the old token, then you will get a CSRF error.\nIf you refresh the page with the form after logging in, then the page will be reloaded with the new token, and CSRF verification should pass.","Q_Score":1,"Tags":"python,django","A_Id":42626309,"CreationDate":"2017-03-06T12:30:00.000","Title":"Django - CSRF verification failed - after successfully logged in","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have multiple python apps that are gathering and doing manipulation with data. \nAt this moment I use pewee as a database, but I am considering integrating them with Django, mostly because of the Django admin (more easy to manually check\/modify data for me and non-devs) instead of building an interface myself.\nThe external apps run independently one of another and do a lot of database operations. They are gathering data from online and offline(excel, csv) sources, and do not run on a server(can be considered desktop apps).\nIt is possible to start an app from Django admin, by adding a button ?\nWhat is the best way to add them from a project organization point of view ?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":68,"Q_Id":42650548,"Users Score":1,"Answer":"Add the app name into installed_apps in Django settings file. Then you can use all the features of the app in django.","Q_Score":1,"Tags":"python,django,python-3.x","A_Id":42651965,"CreationDate":"2017-03-07T14:13:00.000","Title":"Integrating other python apps in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"What does the mytubeid tag(like <iframe src=\"\/portal\/corporateEventsCalendarIframe.html\" mytubeid=\"mytube1\" width=\"820\" height=\"1600\" frameborder=\"0\"\/>) do in an iframe? \nNote that the iframe do not have an id or as such in it!\nHow can it be referenced in code? I am using python+selenium+scrapy to build a webscraping tool.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":159,"Q_Id":42653958,"Users Score":0,"Answer":"If you want to find  this iframe using selenium try something like\ndriver.find_element_by_xpath('\/\/iframe[@mytubeid=\"mytube1\"]').\nFor more explicit answer please provide some code and site url.","Q_Score":0,"Tags":"python,html,selenium,iframe,scrapy","A_Id":42658773,"CreationDate":"2017-03-07T16:57:00.000","Title":"Referencing mytubeid in iframe using Python Selenium","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to start a python script that will parse a csv file uploaded from the UI by the user.  On the client side, how do I make a call to start the python script (I've read AJAX http requests work)?  And then secondly, how do I take the user input (just a simple user upload with the  HTML tag) which will be read by the python script?\nThe back end python script works perfectly through the command line, I just need to create a front end for easier use.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":899,"Q_Id":42660299,"Users Score":0,"Answer":"Many (if not all) server side technology can solve your problem: CGI, Java Servlet, NodeJS, Python, PHP etc. \nThe steps are: \n\nIn browser, upload file via AJAX request.\nIn server, receive file sent from browser, save it somewhere in server disk.\nAfter file is saved, invoke your python script to handle the file.\n\nAs your current script is written by Python, I guess Python is the best choice for server side technology.","Q_Score":0,"Tags":"javascript,jquery,python,ajax,http","A_Id":42662740,"CreationDate":"2017-03-07T23:29:00.000","Title":"Start python script from client side","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to Django, but I recently created my first application. I am wondering if I put my logic in the wrong places. From the Django book, I got that logic should but put into the views and data in models. But I have recently read that views should be as small as possible and let models handle the logic. My problem is my views handle all my logic while my models only handle data going to and from my database. Have I messed up when creating this app, and if so, how would I fix it?","AnswerCount":4,"Available Count":4,"Score":0.1488850336,"is_accepted":false,"ViewCount":1476,"Q_Id":42703962,"Users Score":3,"Answer":"Django's philosophy \/ best practices encourage \"fat models thin controllers\" (controllers being Views in Django). Having tried both ways, it definitely works better with the \"fat models\" approach. Keeping the logic as close to the data models makes it more reusable and you can there are many features in Django that work better that way. \nOne example would be returning a paginated list view. If you need to calculate something for every object in a queryset, you could \n\nloop over it in the view doing the calculation\nor you could add a model method then call it on every iteration in the template. \n\nLooping over the queryset in the view will do the calculation on the whole queryset - not good if you are only showing 10 objects from a list of 1000.\nCalling a model method from the template, the calculation will only be done on the 10 objects on that page. \nObviously you can add some more code to the view to only do that calculation on the objects on that page, but then thats extra code that isn't needed if you go the other route. If you need the same calculation on another page, keeping the logic in a model method will be reusable without any alteration, while you will need to cut and paste it in the view, or create a new method. While its not a huge difference, lots of small things like this start to add up.","Q_Score":2,"Tags":"python,django","A_Id":42706616,"CreationDate":"2017-03-09T19:36:00.000","Title":"Django logic and where to put it?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to Django, but I recently created my first application. I am wondering if I put my logic in the wrong places. From the Django book, I got that logic should but put into the views and data in models. But I have recently read that views should be as small as possible and let models handle the logic. My problem is my views handle all my logic while my models only handle data going to and from my database. Have I messed up when creating this app, and if so, how would I fix it?","AnswerCount":4,"Available Count":4,"Score":0.0,"is_accepted":false,"ViewCount":1476,"Q_Id":42703962,"Users Score":0,"Answer":"The way to do it is simple. And I would say that it is not actually messed up if your logic lies in views mostly.\nThe most repetitive functions and logic which you have used in views in multiple functions, you can create a function defined in model and then call that function in views. (you can do it step by step)\nFor example if it is a social network and you are setting the city of the user. Now as your app grows, possibly there will be many functions and many places through which city is being set. If you are doing it all in views repitively then you would be stuck at some point of time because to make smallest of changes, you might have to edit all the functions.\nThe good way would be to define set_cities(self, cities) in user model and  call it whenever needed like user.set_cities(cities_list). So if you have to trigger other functions everytime city is being set (maybe like sending notifications or updating other tables), you have to define it once only in set_cities().\nIn any case, all logic cannot be only in models so do not worry much about it. Just keep on trying to simplify the views and keep on shifting any repetition of logic to models.","Q_Score":2,"Tags":"python,django","A_Id":42704220,"CreationDate":"2017-03-09T19:36:00.000","Title":"Django logic and where to put it?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to Django, but I recently created my first application. I am wondering if I put my logic in the wrong places. From the Django book, I got that logic should but put into the views and data in models. But I have recently read that views should be as small as possible and let models handle the logic. My problem is my views handle all my logic while my models only handle data going to and from my database. Have I messed up when creating this app, and if so, how would I fix it?","AnswerCount":4,"Available Count":4,"Score":0.049958375,"is_accepted":false,"ViewCount":1476,"Q_Id":42703962,"Users Score":1,"Answer":"It is better to have \"Fat Models, Skinny Views.\" Many of Django experts will give you this tip. Google this phrase and you will find some resources that are saying \"Fat Models, Skinny Views,\" or \"Fat Models, Skinny Controllers.\" By the way, Django creators named Controllers as Views, and Views as Templates which maybe will cause some misunderstanding while reading articles about MVC which is MTV in Django.","Q_Score":2,"Tags":"python,django","A_Id":42704100,"CreationDate":"2017-03-09T19:36:00.000","Title":"Django logic and where to put it?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to Django, but I recently created my first application. I am wondering if I put my logic in the wrong places. From the Django book, I got that logic should but put into the views and data in models. But I have recently read that views should be as small as possible and let models handle the logic. My problem is my views handle all my logic while my models only handle data going to and from my database. Have I messed up when creating this app, and if so, how would I fix it?","AnswerCount":4,"Available Count":4,"Score":0.0,"is_accepted":false,"ViewCount":1476,"Q_Id":42703962,"Users Score":0,"Answer":"No you haven't mess it up. You can find your solution through experience (years of developing).\nSo, either using fat models and thin views or the opposite its up to you and your application requirements.\nAs you learn you'll discover new techniques and methods that will help you extend your \"logic\" and your app implementation.\nAt the beggining you'll make mistakes, but that's alright. We need them to become better developers, coders etc.\nSo my advice is: keep calm and learn (good practices)!","Q_Score":2,"Tags":"python,django","A_Id":42704005,"CreationDate":"2017-03-09T19:36:00.000","Title":"Django logic and where to put it?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it a good practice to just import the models of my Django app in the secondary app and query the database? Does it have any performance issues or something?\nActually the second application is a simple lightweight websocket server.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":192,"Q_Id":42706316,"Users Score":0,"Answer":"you might run into database performance issues if the traffic from both apps overloads the database but that's a solvable problem","Q_Score":1,"Tags":"python,django,websocket","A_Id":42706481,"CreationDate":"2017-03-09T22:01:00.000","Title":"How to share a Django database with another Python app?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I currently have a flask application that uses Flask-Security to handle user login and registration. I'm trying to test a chatroom I made so I want to login to two different accounts in different windows to check if it works. However I can't do that because when I login to account2 it simply logs out account1 in my other browser. I'm certain this has something to do with Flask-Login and user sessions but I'm not sure how to fix this issue. If anyone could point me in the right direction that'd be awesome.\nI tried looking at the LoginManger docs on Flask-Login's site but can't figure out how to disable cookies.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1395,"Q_Id":42710628,"Users Score":0,"Answer":"I was using the same type of browser to try and log into different accounts. Such as two firefox browsers and I tried two firefox incognito browsers. Which in both cases I think they shared the same cookies. After trying with one Chrome and one Firefox it worked correctly.","Q_Score":3,"Tags":"python,flask,flask-login,flask-security","A_Id":42752122,"CreationDate":"2017-03-10T05:05:00.000","Title":"Flask multiple login from same computer","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am attempting to write an endpoint in Python Flask that requires inputs from 2 users to run the function. I would like to have it so that user 1 would send a request with inputs to the backend and then wait for user 2 to send inputs as well. The endpoint would then calculate a result and output it to both users. What is the most efficient way to do this?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":124,"Q_Id":42715005,"Users Score":0,"Answer":"This is best done by some asynchronous mechanism. The best solution will depend on your exact use-case.\n\nWebhook - If user 1 and user 2 are other applications using your api, the simplest way would be with a webhook mechanism. Where user 1 and user 2 would subscribe to the api by depositing a url that your application calls with the results once both inputs are sent.\nPolling - You provide an endpoint that both users need to poll to check if the api is ready to send back the results.\nEmail - You simply email both users the results once you receive both inputs. Or SMS, or IM message ...\nPersistent connections - With a mechanism like websockets or http2 push. You can achieve this with a python application. But it this is the most complex solution and in most cases not needed.","Q_Score":1,"Tags":"python,flask","A_Id":42715400,"CreationDate":"2017-03-10T09:39:00.000","Title":"Multiple Users Connecting to an API Endpoint","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to develop an application that takes as input an url of an e-commerce website and scrap the products titles, prices with the categories and sub-categories.\nScrapy seems like a good solution for scraping data, so my question is how can I tell scrapy where the titles, prices, cat and sub categories are to extract them knowing that websites have different structures and don't really use the same tags?\nEDIT: I gotta change my question to this, can't we write a generic spider that takes the start url, allowed domains, and xpath or css selectors as arguments?","AnswerCount":1,"Available Count":1,"Score":-0.1973753202,"is_accepted":false,"ViewCount":1132,"Q_Id":42716807,"Users Score":-1,"Answer":"Categories and subcategories are usually in the breadcrumbs.\nIn general the css selector for those will be .breadcrumb a and that will probably work for 80% of modern e-commerce websites.","Q_Score":0,"Tags":"python,scrapy,web-crawler,e-commerce,screen-scraping","A_Id":42729874,"CreationDate":"2017-03-10T11:02:00.000","Title":"Scraping products data with categories from e-commerce","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So, I'm trying to deploy a Django Web App to production, but I want to change the secret key before doing so.\nI've attempted to generate a new key using a randomizing function and insert that new key in place of the old one. When I do so, I get an error that says the following:\n\nAttributeError 'module' object has no attribute 'JSONEncoder' ...\n  Exception Location ...\/django\/contrib\/messages\/storage\/cookie.py in\n  , line 9\n\nI've deleted the browser cache and restarted the server, but the error persists.\nI've also attempted to change the key back, after deleting the browser cache and restarting, the error still persists.\nAny idea how to resolve this issue?\nEdit: Python version is 2.6.6 and Django version is 1.3.1","AnswerCount":2,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":4502,"Q_Id":42726719,"Users Score":7,"Answer":"So, to answer my own question, changing the assigned key is done the same way you'd change any other variable. Just create a 50 character (ideally random) string and set SECRET_KEY equal to it.\nSECRET_KEY = \"#$%&N(ASFGAD^*(%326n26835625BEWSRTSER&^@T#%$Bwertb\"\nThen restart the web application.\nMy problem was completely unrelated. It occurred because I set the path python uses to locate packages to a weird location. Sorry about that guys.","Q_Score":8,"Tags":"python,django,secret-key","A_Id":42772208,"CreationDate":"2017-03-10T19:57:00.000","Title":"How can i properly change the assigned secret key in a Django Web Application","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've studied Python and Django, building a homepage.\nAnd I've been using a virtual memory on Ubuntu server(apache2 2.4.18\/ php-7.0\/ MariaDB 10.0.28 with phpMyAdmin\/ FTP) offered for developers.\nThe server hadn't allowed users to use python, but I asked the server administrator to give me a permission and I got it.\nThe problem was, however, that I was not allowed to use not only any sudo command line but also basic commands like apt-get and python.\nThe only administrator can do so, therefore it seems that I cannot install any neccessary things-virtualenv, django, and so on- by myself. \nJust to check whether .py file works or not, I added <?php include_once\"test.py\" ?> on the header of index.php about the test.py where only print \"python test\"(meaning only python 2 is installed on this server) is written. It works. That is, I guess, all I can do is uploading .py file with Filezilla.\nIn this case, can I make a homepage with Python on this server efficiently? I was thinking about using Bottle Framework, but also not sure. \nI am confused with wondering whether I should use PHP on this server and using Python on PythonAnywhere in the end.\nI am a beginner. Any advice will be appreciated :)","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":38,"Q_Id":42730059,"Users Score":1,"Answer":"Have you thought about asking the admin to start a virtualenv for you and give you permissions to work in that environment?","Q_Score":0,"Tags":"python,django","A_Id":42730116,"CreationDate":"2017-03-11T00:50:00.000","Title":"Is it possible to build a homepage with python on virtual server when the sudo command is disabled?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have been updating about 1000 sheets using Python. Each takes about 2-3 minutes to update. The job ran most of the day yesterday (~8hrs). And when I look at my quotas for Google Sheets API in console.developers.google.com, I have used about 3k in the read group and 4k in the write group. Not nearly close to the 40k quota that is given. \nNow all of the 1000 sheets interact with one sheet because all of the keys are on that one sheet. \nIn fact, I have tried using 2 different project sign ins, one through my company domain and one through my gmail, that both have access to these files. When I run it with the company credentials. It also gives me a HttpError 429, and 0 requests have been made with that credential. \nIs there some hidden quota I don't know about? Like calls to one spreadsheet? That's what it seems like. Google, are you cutting me off to the spreadsheet because I accessed it for 8hrs yesterday?\nIt is bombing on spreadsheets().values().update and spreadsheets().batchUpdate","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":10665,"Q_Id":42735670,"Users Score":0,"Answer":"I had this issue with a long-running script...I am putting batches of data in spreadsheets, and every 100k rows I start on a new spreadsheet. The data is rolled up on a separate spreadsheet using IMPORTRANGE(). the first 3 were fine but the 4th was bombing with the \"Resource has been exhausted\" error. I noticed that when I saw this error, the IMPORTRANGE() was also failing in the browser. The error must be indicating something wrong with the server where the spreadsheet is stored\/served, and is not API-related. Switching to a new spreadsheet fixed the error for me.","Q_Score":3,"Tags":"python,google-sheets,google-sheets-api,quota","A_Id":59957826,"CreationDate":"2017-03-11T13:18:00.000","Title":"Google sheets API v4: HttpError 429. \"Resource has been exhausted (e.g. check quota).\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am doing API for my app using flask. It is like, suppose you query the API, it will give a list of 100 items as a response. I need to show first 10 to the users and save rest 90 in cache, so when user swiped those first 10 items, I will display next 11-20 items and so on..\nThe problem I am facing is to where store those 90 items and retrieve them using API. I am thinking of doing this using varnish as cache to store responses. I want to know is varnish a good fit here? If yes then How? or Is there any better way to achieve the desired result?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":119,"Q_Id":42746949,"Users Score":0,"Answer":"No, that's not really what Varnish is for; it's more for caching complete pages.\nA better fit here would be memcached, which is perfect for storing arbitrary data against a key. Redis could be another alternative.","Q_Score":0,"Tags":"python,caching,flask","A_Id":42746999,"CreationDate":"2017-03-12T11:41:00.000","Title":"Flask-python caching","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to get the INSPECT ELEMENT data of a website. Let's say Truecaller. So that i can get the Name of the person who's mobile number I searched.\nBut whenever i make a python script it gives me the PAGE SOURCE that does not contain the required information.\nKindly help me. I am a beginner so kindly excuse me of any mistake in the question.","AnswerCount":3,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":3156,"Q_Id":42757866,"Users Score":0,"Answer":"INSPECT ELEMENT and VIEW PAGE SOURCE are not the same. \nView source shows you the original HTML source of the page. When you view source from the browser, you get the HTML as it was delivered by the server, not after javascript does its thing.\nThe inspector shows you the DOM as it was interpreted by the browser. This includes for example changes made by javascript which cannot be seen in the HTML source.","Q_Score":0,"Tags":"javascript,python,html,python-2.7,dom","A_Id":42757939,"CreationDate":"2017-03-13T06:46:00.000","Title":"How do I get the data of a website as shown in INSPECT ELEMENT and not in VIEW PAGE SOURCE?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to get the INSPECT ELEMENT data of a website. Let's say Truecaller. So that i can get the Name of the person who's mobile number I searched.\nBut whenever i make a python script it gives me the PAGE SOURCE that does not contain the required information.\nKindly help me. I am a beginner so kindly excuse me of any mistake in the question.","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":3156,"Q_Id":42757866,"Users Score":0,"Answer":"what you see in the element inspector is not the source-code anymore.\nYou see a javascript manipulated version.\nInstead of trying to execute all the scripts on your own which may lead into multiple problems like cross origin security and so on,\nsearch the network tab for the actual search request and its parameters. \nThen request the data from there, that is the trick.\nAlso it seems like you need to be logged in to search on the url you provided so you need to eventually adapt cookie\/session\/header and stuff, just like a request from your browser would.\nSo what i want to say is, better analyse where the data you look for is coming from if it is not in the source","Q_Score":0,"Tags":"javascript,python,html,python-2.7,dom","A_Id":42758772,"CreationDate":"2017-03-13T06:46:00.000","Title":"How do I get the data of a website as shown in INSPECT ELEMENT and not in VIEW PAGE SOURCE?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to use ZEEP v1.2.0 to connect to some service and ran into this issue.\nI just execute: python -mzeep http:\/\/fulfill.sfcservice.com\/default\/svc\/wsdl\nResult:\nzeep.exceptions.LookupError: No type 'string' in namespace\nhttp:\/\/www.chinafulfill.com\/CffSvc\/. Available types are: [...]\nAm I missing anything here to test this?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":996,"Q_Id":42759735,"Users Score":1,"Answer":"No this is a bug in the WSDL file, It defines an element with type \"tns:string\", I assume they meant \"xsd:string\".\nSee the following line in the wsdl:","Q_Score":0,"Tags":"python,soap,wsdl,zeep","A_Id":42760121,"CreationDate":"2017-03-13T09:00:00.000","Title":"ZEEP WSDL LookupError: No type 'string' in namespace","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"If a database table contains 100 fields, and a django application utilises only a few fields say 1 or 2, does the corresponding django model needs to be declared with 100 fields?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":252,"Q_Id":42781136,"Users Score":1,"Answer":"No, you do not need to declare the Django model with all the fields from the database.","Q_Score":2,"Tags":"python,mysql,django","A_Id":42781404,"CreationDate":"2017-03-14T08:34:00.000","Title":"Django model with number of fields less than corresponding database table","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am looking to have a model that can accept a partially completed date as one of its field. \nThe field is supposed to represent the date that a historical event happened. Some of these events are only known to the year or month and not to the day. \nIs there any graceful way to handle this?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":19,"Q_Id":42798315,"Users Score":0,"Answer":"I think CharField is better if you just want to represent it","Q_Score":0,"Tags":"python,django,datetime,django-models","A_Id":42798413,"CreationDate":"2017-03-14T23:18:00.000","Title":"Python Django Datetime Field that doesn't need all the information","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"What I have done:\n1- Created a web form using HTML and javascript to create a SSL certificate that can create dynamic certificates.\n2- Successfully parsed through an existing certificate and passed the required values to the web form.\n3- I am using the HTML+javascript inside the python script itself and appending the parsed certificate values to the javascript before displaying it.\nWhat I need to do:\n1-Take values from the web form, assign those to particular variables and pass those variables to a python script, that can create a CSR using those and sign it using a dummy key.\nSo, basically, I want to call a python script on a click of a button that can take web form values and create a certificate.\nP.S. PHP isn't an option for me, as the server I am working on doesn't support it.\nCan someone guide me in the right direction as for how to proceed? Any examples or study material? Or should I start working with Flask?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":134,"Q_Id":42801569,"Users Score":1,"Answer":"Django is a good option to create applications using python. You can start an application, and embed your code in template and write a view to handle requests and responses.","Q_Score":0,"Tags":"javascript,python,ssl,x509certificate","A_Id":42801616,"CreationDate":"2017-03-15T05:13:00.000","Title":"Using javascript to pass web forms values to python script","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've been trying to add a foreign key to my models in Django 1.9 with the option on_delete='DO_NOTHING' per instructions on Django Docs, but for version 1.10. I ran python manage.py makemigrations without any problems but when I tried to run python manage.py migrate of course I got the error:\ndjango.core.exceptions.FieldDoesNotExist: Entrance has no field named u'DO_NOTHING'\nRealizing my mistake, I changed the option to on_delete=models.DO_NOTHING and ran makemigrations and migrate again but I'm still getting the same error:\ndjango.core.exceptions.FieldDoesNotExist: Entrance has no field named u'DO_NOTHING'\nLooks like something is wrong in migration files. Not too familiar with internal workings of Django so I don't know where to look to fix this. Any ideas?","AnswerCount":4,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1411,"Q_Id":42806319,"Users Score":0,"Answer":"Look django_migrations table in db. Find last migrated migrations file there\nand compare this file with next migrations file.\nYou can also add last migrations file in there with manually if everything okay in your database.","Q_Score":0,"Tags":"python,django","A_Id":42808397,"CreationDate":"2017-03-15T09:56:00.000","Title":"Django migration error: has no field named u'DO_NOTHING'","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've been trying to add a foreign key to my models in Django 1.9 with the option on_delete='DO_NOTHING' per instructions on Django Docs, but for version 1.10. I ran python manage.py makemigrations without any problems but when I tried to run python manage.py migrate of course I got the error:\ndjango.core.exceptions.FieldDoesNotExist: Entrance has no field named u'DO_NOTHING'\nRealizing my mistake, I changed the option to on_delete=models.DO_NOTHING and ran makemigrations and migrate again but I'm still getting the same error:\ndjango.core.exceptions.FieldDoesNotExist: Entrance has no field named u'DO_NOTHING'\nLooks like something is wrong in migration files. Not too familiar with internal workings of Django so I don't know where to look to fix this. Any ideas?","AnswerCount":4,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1411,"Q_Id":42806319,"Users Score":0,"Answer":"When you added the migration with on_delete='DO_NOTHING' django generated a migration. Then, you generated a new migration with on_delete=models.DO_NOTHING. So you have to delete both migrations located in your_project\/your_app\/migrations\/ and then execute makemigrations again.\nHope it helps!","Q_Score":0,"Tags":"python,django","A_Id":42806401,"CreationDate":"2017-03-15T09:56:00.000","Title":"Django migration error: has no field named u'DO_NOTHING'","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am downloading an .apk file from a link.\nI open browser > Go to URL > Chrome browser is displayed.\nHow do I click on \"OK\" from the alert.\nI am using AppiumLibrary.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":480,"Q_Id":42817322,"Users Score":0,"Answer":"capabilities.setCapability(\u201cautoAcceptAlerts\u201d,true);","Q_Score":1,"Tags":"android,appium,robotframework,python-appium","A_Id":62967696,"CreationDate":"2017-03-15T17:59:00.000","Title":"Handle browser alert\/pop up in Robot framework + appium","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working on a project where i do need to do a communication in 3 parts. Let me explain:\n1.- The user fills a form, which is used to create a set of objects from the models. This objects are not saved in the database on this moment. All the objects are related between them.\n2.- This objects must be saved in some way for an admin user to check the data and decide if proceed to save it, or if any element is invalid and reject the form.\n3.- If the admin decide that the data is correct, select an option to send a .save() to add the data to the database.\nAt least that's the idea i have on how should work. I decided to create the objects before send it to the admin because it sounded easier to show that if i sended the request.POST and the request.FILES. My problem is that i don't know where could save the objects to show it to the admin when he connects(There are 2 types of users, Normal and Admin, the normal are the ones that fill the forms, the admins only check it, the two of them has their own views). So, does anyone how could i send the data and storage it until the admin connects? I'm open to any idea if this is not possible, the only thing that is necesary is the flow of: User fills the form, admin check it, data is saved or rejected.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":38,"Q_Id":42823336,"Users Score":1,"Answer":"You will want to save() them when the user submits the form at the start. Add a BooleanField to your model that says whether the row has been moderated and accepted. Then in your application, filter out all non-moderated rows, and on the admin side, filter out only rows that need moderation.","Q_Score":1,"Tags":"python,django","A_Id":42823497,"CreationDate":"2017-03-16T00:43:00.000","Title":"How to storage objects for communication without the database in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm attempting to access a Google Cloud SQL instance stored on one Cloud Platform project from an App Engine application on another project, and it's not working.\nConnections to the SQL instance fail with this error:\nOperationalError: (2013, \"Lost connection to MySQL server at 'reading initial communication packet', system error: 38\")\nI followed the instructions in Google's documentation and added the App Engine service account for the second project to the IAM permissions list for the project housing the Cloud SQL instance (with \"Cloud SQL Editor\" as the role). The connection details and configuration I'm using in my app are identical to those being used in a perfectly functioning App Engine app housed in the same project as the Cloud SQL instance.\nThe only thing that seems off about my configuration is that in my second GCP project, while an App Engine service account that looks like the default one ([MY-PROJECT-NAME]@appspot.gserviceaccount.com) appears in the IAM permissions list, this service account is not listed under the Service Accounts tab of IAM & Admin. The only service account listed is the Compute Engine default service account. I haven't deleted any service accounts; there's never been an App Engine default service account listed here, but apart from the MySQL connection the App Engine app runs fine.\nNot sure if it's relevant, but I'm running a Python 2.7 app on the App Engine Standard Environment, connecting using MySQLdb.","AnswerCount":1,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":3103,"Q_Id":42826560,"Users Score":6,"Answer":"Figured it out eventually - perhaps this will be useful to someone else encountering the same problem. \nProblem:\n\nThe problem was that the \"Cloud SQL Editor\" role is not a superset\n  of the \"Cloud SQL Client\", as I had imagined; \"Cloud SQL Editor\"\n  allows administration of the Cloud SQL instance, but doesn't allow\n  basic connectivity to the database.\n\nSolution:\n\nDeleting the IAM entry granting Cloud SQL Editor permissions and\n  replacing it with one granting Cloud SQL Client permissions fixed the\n  issue and allowed the database connection to go through.","Q_Score":3,"Tags":"python,mysql,google-app-engine,google-cloud-sql","A_Id":42827972,"CreationDate":"2017-03-16T06:14:00.000","Title":"Can't access Google Cloud SQL instance from different GCP project, despite setting IAM permissions","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I need to implement a special superuser account with ability to change the current session to a new session of any other user. How do I change to a different account if I'm already logged in?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":475,"Q_Id":42837372,"Users Score":2,"Answer":"In the same way that you logged in the current user, call login_user with a different user instance to become that user.\nYou can't acquire their actual session data though unless you're using server side sessions. The default cookie-based session only stores the data as a cookie, which only the real user has access to.\nConsider the security implications before implementing something like this. If a superuser can become any user, then only one login needs to be compromised to get everyone's data.","Q_Score":1,"Tags":"python,flask,flask-login","A_Id":42837507,"CreationDate":"2017-03-16T14:47:00.000","Title":"Change Flask-Login currently logged in user","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an app on Google App Engine, I used to deploy my application and see the deployed files and changes instantly.\nBut recently I have to wait about 5 minutes to see if the files are changed.\nThe only thing that I suspect is that I changed the application Zone. I am not sure what was the default Zone but now I set it to us-central1-a.\nHow can I solve this issue? I want to see all changes instantly as before.\nThanks!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":47,"Q_Id":42848692,"Users Score":0,"Answer":"A common reason for not seeing your changes instantly after deploying is that you didn't change the application version. Instances with the same version will continue serving traffic until they die off, which could take a while. If instead you bump the default version, traffic will only be routed to instances that are funning the newer version of the code.","Q_Score":0,"Tags":"google-app-engine,google-app-engine-python","A_Id":42870689,"CreationDate":"2017-03-17T03:26:00.000","Title":"After deploying python app on Google App Engine changes are reflected after several minutes","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"i have published my website using python-php mysql hosting server. Now they told me to create an virtualenv after that i was able to install my required packages like pypi newspaper. My python scripts are totally dependent on pypi newspaper.\nNow the issue is that when i call my index.php from publi_html and call my python script it shows me following error:\n\nTraceback (most recent call last):\" [1]=> string(79) \" File\n  \"\/home\/adpnewsi\/public_html\/adpScripts\/getImage.py\", line 3, in \"\n  [2]=> string(33) \" from newspaper import Article\" [3]=> string(38)\n  \"ImportError: No module named newspaper\" }","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":50,"Q_Id":42871961,"Users Score":0,"Answer":"You are probably not using the virtual python environment. \nIn your terminal type which python. \nIf the output is \/usr\/bin\/python you need to switch to your virtual environment.\nGo to the directory where you created your virtualenv and in terminal enter source bin\/activate. Then use which python to verify your are now using your virtual environment to run the server.","Q_Score":0,"Tags":"php,python,mysql","A_Id":42872603,"CreationDate":"2017-03-18T08:02:00.000","Title":"error while executing python script from php","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am creating a social networking site using django. I will send lots of emails depending on the user actions. Should I create an email app or just create an email_funcitons.py file in each individual app. Which is best practice? \nApps created so far:\nAccounts\nNewsFeed\nProfile\nNotifications\nMessaging\nPrivacy","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":285,"Q_Id":42873225,"Users Score":1,"Answer":"You should create separate module. There is no reason to have same function implemented in multiple places, it makes your code hard to maintenance.\nEach functionality should have own module (in this case app), so modifying email you will have to modify only one file\/module, not all email functions in all modules","Q_Score":0,"Tags":"python,django","A_Id":42874336,"CreationDate":"2017-03-18T10:34:00.000","Title":"I am creating a social networking site using django, should I have create a email app","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I tried to install python tools 2.2 for Visual studio 2013 for flask web development, but i keep getting an error saying,\n\nUnsupported python version - 3.6\n\nMy python version is 3.6.0. Is python 3.6 supported on Visual Studio 2013?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":4969,"Q_Id":42878237,"Users Score":0,"Answer":"PTVS 2.2.2 works for Visual Studio 2013 + Python 3.6.","Q_Score":1,"Tags":"python,visual-studio-2013","A_Id":56850040,"CreationDate":"2017-03-18T18:27:00.000","Title":"Python 3.6 supported for visual studio 2013","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a backend with two flask servers. One that handles all RESTfull request and one that is an flask-socketio server. Is there a way how I can share the session variables (Logged in User etc.) between these two applications? They do run over different ports if that is important.\nHow I have understood sessions they work over client session cookies so shouldn't both of these servers have access to the information? If yes how? and if not is there a way to achieve the same effect?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":2550,"Q_Id":42879963,"Users Score":5,"Answer":"There are a couple of ways to go at this, depending on how you have your two servers set up.\nThe easiest solution is to have both servers appear to the client on the same domain and port. For example, you can have www.example.com\/socket.io as the root for your Socket.IO server, and any other URLs on www.example.com going to your HTTP server. To achieve this, you need to use a reverse proxy server, such as nginx. Clients do not connect directly to your servers, instead they connect to nginx on a single port, and nginx is configured to forward requests the the appropriate server depending on the URL.\nWith the above set up both servers are exposed to the client on the same domain, so session cookies will be sent to both.\nIf you want to have your servers appear separate to your client, then a good option to share session data is to switch to server-side sessions, stored in Redis, memcache, etc. You can use the Flask-Session to set that up.\nHope this helps!","Q_Score":4,"Tags":"python,session,flask,socket.io,flask-socketio","A_Id":42888376,"CreationDate":"2017-03-18T21:14:00.000","Title":"Sharing sessions between two flask servers","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a backend with two flask servers. One that handles all RESTfull request and one that is an flask-socketio server. Is there a way how I can share the session variables (Logged in User etc.) between these two applications? They do run over different ports if that is important.\nHow I have understood sessions they work over client session cookies so shouldn't both of these servers have access to the information? If yes how? and if not is there a way to achieve the same effect?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":2550,"Q_Id":42879963,"Users Score":0,"Answer":"I found that flask.session.sid = sid_from_another_domain works fine in having individual sub domains case.\nI have several flask apps has individual domain names like A.domain.com, B.domain.com, and C.domain.com.\nThey all are based on flask and has redis session manager connected to same redis server.\nI wanted to federate them to be logged in at once and to be logged out too.\nI had to save the session id on db with user infomation together when I logged in A and passed it to domain B.\nThese domains communicates using oauth2 protocol, and I used flask_dance in this case.\nAnd set it into flask.session.sid on B domain.\nAnd then I could confirmed that this implementation works fine.","Q_Score":4,"Tags":"python,session,flask,socket.io,flask-socketio","A_Id":62935664,"CreationDate":"2017-03-18T21:14:00.000","Title":"Sharing sessions between two flask servers","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How can I use pymel, or just python in general, to render the current frame with whatever settings are given?\nI've looked into pymel.core.rendering, but all I can find are render specific commands. I tried the basic cmds.render() but it didn't do anything.\nI basically want the same functionality as the \"Render Current Frame\"-Button at the top of the UI - that it renders the currently active view with whatever the settings are.\nI hope you can help me!","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":748,"Q_Id":42903669,"Users Score":1,"Answer":"I figured it out by looking at the script editor. It's within the runtime module. So for anyone else with this problem, the command is:\npymel.Core.runtime.RenderIntoNewWindow()","Q_Score":0,"Tags":"python,maya,autodesk,pymel","A_Id":42905764,"CreationDate":"2017-03-20T12:30:00.000","Title":"\"Render Current Frame\" in Maya with Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"We have a flask app running behind uwsgi with 4 processes. Its an API which serves data from one of our two ElasticSearch clusters. \nOn app bootstrap each process pulls config from external DB to check which ES cluster is active and connects to it.\nEvey now and then POST request comes (from aws SNS service) which informs all the clients to switch ES cluster. That triggers the same function as on bootstrap - pull config from DB reconnect to active ES cluster.\nIt works well running as a single process, but when we have more then one process running only one of them will get updated (the one which picks up POST request)... where other processes are still connected to inactive cluster.\nPulling config on each request to make sure that ES cluster we use is active would be to slow. Im thinking to install redis locally and store the active_es_cluster there... any other ideas?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":504,"Q_Id":42967242,"Users Score":2,"Answer":"I think there are two routes you could go down.\n\nHave an endpoint \"\/set_es_cluster\" that gets hit by your SNS POST request. This endpoint then sets the key \"active_es_cluster\", which is read on every ES request by your other processes. The downside of this is that on each ES request you need to do a redis lookup first.\nHave a seperate process that gets the POST request specifically (I assume the clusters are not changing often). The purpose of this process is to receive the post request and just have uWSGI gracefully restart your other flask processes.\n\nThe advantages of the second option:\n\nDon't have to hit redis on every request\nLet uWSGI handle the restarts for you (which it does well)\nYou already setup the config pulling at runtime anyway so it should \"just work\" with your existing application","Q_Score":4,"Tags":"python,flask,multiprocessing,uwsgi","A_Id":42967483,"CreationDate":"2017-03-23T04:26:00.000","Title":"Python + uwsgi - multiprocessing and shared app state","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am developing a python application which will majorly be used as a command line interface. I want to push notifications from Amazon SNS or Google PubSub to the python application.\nIs this possible? \nIf yes, what is the best solution to this?\nIf no, is there a workaround?\nThank you for the help.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":80,"Q_Id":42969345,"Users Score":1,"Answer":"It is not possible for CLI applications\nThe workarounds are\n\nHave a web api and register the endpoint with SNS. SNS will push notifications to the web API. From the web api somehow pass that to the CLI app, using either RPC calls or some other mechanism\nHave the SNS push notifications to AWS SQS and then from your CLI poll the SQS","Q_Score":0,"Tags":"python,push-notification,command-line-interface,amazon-sns,google-cloud-pubsub","A_Id":43002548,"CreationDate":"2017-03-23T07:07:00.000","Title":"SNS\/PubSub notifications on a Python CLI Application?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a list of Django objects, all from the same class and those objects are not saved in the DB. \nI want to sort the list (again, a list of models) by a specific field in that class.\nHow can I do that?\nThanks!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1595,"Q_Id":42972951,"Users Score":4,"Answer":"so this is what I did and it worked for me:\nlist_of_models = sorted(list_of_models , key = lambda x: x.object.time)","Q_Score":1,"Tags":"python,django,django-models","A_Id":42973432,"CreationDate":"2017-03-23T10:09:00.000","Title":"sort a list of django models by specific fields","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to know, how one can edit an uploaded CSV file to the database, using Django admin panel and then save the changes.\nDetails: So I have uploaded a csv file to the database and I want my users to go the Django admin panel, log in with their username and password and then edit the uploaded CSV file and then save the changes.\nP.S: I am a beginner in Django so any help will be much much appreciated. Thanks :)","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1138,"Q_Id":42973795,"Users Score":0,"Answer":"Django admin (and django in general) does not provide any editing functionality for editing CSV files. Your only option is to let users download the uploaded file, change it and then upload it again in the place of the old one. There's also no third party tool to make this in the admin. You have write your own probably.","Q_Score":2,"Tags":"python,django,database,csv","A_Id":42976604,"CreationDate":"2017-03-23T10:45:00.000","Title":"How to edit uploaded csv files using django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to Django.\nI was trying to design a model in django. First I did with adding some fields, then I migrated the code. Later I found that I should have some other fields. I added some new fields, let say a CharField. Then while I was doing the migration, its showing error like you are trying to add a non-nullable field without a default. Can anybody tell should I add every time a default value to a new field OR Is there any other way to handle this?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":80,"Q_Id":42983117,"Users Score":3,"Answer":"You would need to add null=True to the field parameter that gives you this error in your model to allow for null values or give it a default value default=<value> and then re-run your migration","Q_Score":0,"Tags":"python,django","A_Id":42983217,"CreationDate":"2017-03-23T17:34:00.000","Title":"What is the right way to add a field in the middle in django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"apologies upfront. I am an extreme newbie and this is probably a very easy question. After much trial and error, I set up an app on Heroku that runs a python script that scrapes data off of a website and stores it in a text file. (I may switch the output to a .csv file). The script and app are running on a Heroku Scheduler, so the scraping takes place on a schedule and the data automatically gets written to the file that is on the Heroku platform. I simply want to download the particular output file occasionally so that I can look at it. (Part of the data that is scraped is being tweeted on a twitter bot that is part of the script.)\n(Not sure that this is relevant but I uploaded everything through Git.)\nMany thank in advance.","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":1626,"Q_Id":42989247,"Users Score":1,"Answer":"Not just ephemeral, but immutable, which means you can't write to the file system. You'll have to put the file in something like S3, or just put the data into a database like Postgres.","Q_Score":1,"Tags":"python,heroku","A_Id":43195564,"CreationDate":"2017-03-24T00:16:00.000","Title":"How to Access text files uploaded to Heroku that is running with Python Script","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"apologies upfront. I am an extreme newbie and this is probably a very easy question. After much trial and error, I set up an app on Heroku that runs a python script that scrapes data off of a website and stores it in a text file. (I may switch the output to a .csv file). The script and app are running on a Heroku Scheduler, so the scraping takes place on a schedule and the data automatically gets written to the file that is on the Heroku platform. I simply want to download the particular output file occasionally so that I can look at it. (Part of the data that is scraped is being tweeted on a twitter bot that is part of the script.)\n(Not sure that this is relevant but I uploaded everything through Git.)\nMany thank in advance.","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":1626,"Q_Id":42989247,"Users Score":1,"Answer":"You can run this command heroku run cat path\/to\/file.txt, but keep in mind that Heroku uses ephemeral storage, so you don't have any guarantee that your file will be there.\nFor example, Heroku restarts your dynos every 24 hours or so. After that you won't have that file anymore. The general practice is to store files on some external storage provider like Amazon S3.","Q_Score":1,"Tags":"python,heroku","A_Id":42989347,"CreationDate":"2017-03-24T00:16:00.000","Title":"How to Access text files uploaded to Heroku that is running with Python Script","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I use microsoft bot framework and a flask based bot server in my application.\nWhen someone installs the bot, the Botframework stores the JSON POSTed by slack, including data like SLACK_TEAM_ID, SLACK_USER_ID and BOT_ACCESS_TOKEN. Its great, that from this point whenever, an user mentions or directmessages the botuser, the Bot Framework POSTs a JSON to the flask server.\nWhat I would like is, right when the user installs the bot, the Bot Framework does a POST call to the flask server, so that I can (say) congratulate the user for installing my bot. \nIn short: How to get my flask application notified as to who installs my bot as soon as they install it?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":51,"Q_Id":43002043,"Users Score":0,"Answer":"ConversationUpdate should be sent any time a bot is added to a channel with a user in it. Are you not seeing that on install?","Q_Score":0,"Tags":"python,rest,botframework","A_Id":43031505,"CreationDate":"2017-03-24T14:26:00.000","Title":"How can my bot server know INSTANTLY when someone installed the bot using Add-to-slack button?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to generate a flask-sqlalchemy for an existing mysql db.\nI used the following command\nflask-sqlacodegen --outfile rcdb.py mysql:\/\/username:password@hostname\/tablename\nThe project uses python 3.4. Any clues?\n```Traceback (most recent call last):\nFile \"\/var\/www\/devaccess\/py_api\/ds\/venv\/bin\/flask-sqlacodegen\", line 11, in \nsys.exit(main())\nFile \"\/var\/www\/devaccess\/py_api\/ds\/venv\/lib\/python3.4\/site-packages\/sqlacodegen\/main.py\", line 59, in main\nTraceback (most recent call last):\nFile \"\/var\/www\/devaccess\/py_api\/ds\/venv\/bin\/flask-sqlacodegen\", line 11, in \nsys.exit(main())\nFile \"\/var\/www\/devaccess\/py_api\/ds\/venv\/lib\/python3.4\/site-packages\/sqlacodegen\/main.py\", line 59, in main\nargs.flask, ignore_cols, args.noclasses)\nFile \"\/var\/www\/devaccess\/py_api\/ds\/venv\/lib\/python3.4\/site-packages\/sqlacodegen\/codegen.py\", line 606, in init\nmodel = ModelClass(table, links[table.name], inflect_engine, not nojoined)\nFile \"\/var\/www\/devaccess\/py_api\/ds\/venv\/lib\/python3.4\/site-packages\/sqlacodegen\/codegen.py\", line 335, in init\nrelationship_ = ManyToManyRelationship(self.name, target_cls, association_table, inflect_engine)\nFile \"\/var\/www\/devaccess\/py_api\/ds\/venv\/lib\/python3.4\/site-packages\/sqlacodegen\/codegen.py\", line 501, in init\nself.kwargs['secondary'] = repr(assocation_table.schema + '.' + assocation_table.name)\nTypeError: unsupported operand type(s) for +: 'NoneType' and 'str'\n```","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":362,"Q_Id":43008166,"Users Score":1,"Answer":"try specifying your database schema with option --schema","Q_Score":1,"Tags":"python-3.x,sqlalchemy,flask-sqlalchemy,sqlacodegen","A_Id":49161491,"CreationDate":"2017-03-24T20:00:00.000","Title":"flask-sqlacodegen suports python 3.4?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"If database(Django ORM) is based on data which is parsed . And there is a 'city' field, which is often used when filtering data. Is it much better to use Chocies or just Charfield for saving 'city' into the field. Will be filtering much faster?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":23,"Q_Id":43019666,"Users Score":0,"Answer":"Choices field like positiveintegerfield will has smaller size than charfield \nif you save cities as [(1, 'NY'),(2, ' LA')] in positiveintegerfield but at query complexity time I think integer will win \nInt comparisons are faster than varchar comparisons, for the simple fact that ints take up much less space than varchars.\nThis holds true both for unindexed and indexed access. The fastest way to go is an indexed int column.\nfor postgresql, you might be interested in the space usage of different date types:\n\nint fields occupy between 2 and 8 bytes, with 4 being usually more\n  than enough ( -2147483648 to +2147483647 ) \n      character types occupy 4 bytes plus the actual strings.","Q_Score":0,"Tags":"python,django","A_Id":43020395,"CreationDate":"2017-03-25T17:34:00.000","Title":"Choices VS Charfield in filtering","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to stackoverflow, very new to Python and trying to learn Django.\nI am on Windows 10 and running commands from powershell (as administrator). \nI am in a virtual environment.  I am trying to set up Django. \nI have run the following commands\n\"pip install Django\"\n\"django-admin.py startproject learning_log .\"\n\"python manage.py migrate\"\nAll of the above seemed to work okay, however, when I then try to run the command\n\"python manage.py runserver\"\nI get a popup error box that says:\nPython has stopped working\nA problem caused the program to stop working correctly.\nWindows will close the program and notify you if a solution is available.\nCan someone tell me how to resolve this issue or where to look for any error messages that might clue me in as to what is causing the problem?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":2081,"Q_Id":43024066,"Users Score":0,"Answer":"I finally got the \"python manage.py runserver\" command to work. The only thing different I did was before setting up the virtual env and installing Django was set my executionpolicy to Unrestricted. Previously it had been set to RemoteSigned. I hadn't been gettiing any warning or errors but thought I would try it and it worked.","Q_Score":0,"Tags":"python,django","A_Id":43051626,"CreationDate":"2017-03-26T01:47:00.000","Title":"Python stops working on manage.py runserver","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to stackoverflow, very new to Python and trying to learn Django.\nI am on Windows 10 and running commands from powershell (as administrator). \nI am in a virtual environment.  I am trying to set up Django. \nI have run the following commands\n\"pip install Django\"\n\"django-admin.py startproject learning_log .\"\n\"python manage.py migrate\"\nAll of the above seemed to work okay, however, when I then try to run the command\n\"python manage.py runserver\"\nI get a popup error box that says:\nPython has stopped working\nA problem caused the program to stop working correctly.\nWindows will close the program and notify you if a solution is available.\nCan someone tell me how to resolve this issue or where to look for any error messages that might clue me in as to what is causing the problem?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":2081,"Q_Id":43024066,"Users Score":0,"Answer":"I encountered the same problem. After trying everything, I switched from PS to cmd, cd to the same directory and run python manage.py runserver. Then it worked. Then I ctrl+C quit the server, switched back to PS, ran the command, it still threw the same dialog window (Python stopped working). Then I went back to cmd, typed the command and the server started fine.\nConclusion: Use cmd to run the command, not PS.","Q_Score":0,"Tags":"python,django","A_Id":49569047,"CreationDate":"2017-03-26T01:47:00.000","Title":"Python stops working on manage.py runserver","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"There are already some question on this but most of their answers are using models based workflow which is not a recommended way anymore according to django-registration. I am just frustrated from last week, trying to figure out how to add first and last name fields in registration form in HMAC Workflow.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":174,"Q_Id":43026801,"Users Score":1,"Answer":"I am not intimately familiar with django, but an easy solution would be to follow the default registration workflow to let your user register. Then when your user tries to login for the first time you present them with a form to fill with all the extra information you might need.\nIn this way you also decouple the actual account creation from asking the user for more information, creating for them an extra incentive to actually go through with this process (\"Oh man why do I need to provide my name, let's not sign up\" vs \"Oh well, I have already registered and given them an email might as well go through with it\")\n\nIf you would prefer to have them in one step, then providing what code you have already would help us provide better feedback","Q_Score":0,"Tags":"python,django,django-registration","A_Id":43152421,"CreationDate":"2017-03-26T08:47:00.000","Title":"How to add custom-fields (First and Last Name) in django-registration 2.2 (HMAC activation Workflow)?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to use gunicorn for a REST API application with Flask\/Python. What is the purpose of adding nginx here to gunicorn? The gunicorn site recommends using gunicorn with nginx.","AnswerCount":5,"Available Count":3,"Score":1.0,"is_accepted":false,"ViewCount":31058,"Q_Id":43044659,"Users Score":8,"Answer":"Do you know why the Django mascot is a pony? The story is that Django\n  comes with so many things you want: an ORM, all sorts of middleware,\n  the admin site\u2026\u200b \"What else do you want, a pony?\" Well, Gunicorn\n  stands for \"Green Unicorn\" - obeythetestinggoat.com\n\n\nNginx is the front face for your server.\nGunicorn runs multiple django projects(each project is a wsgi\napplication powered by Gunicorn) in a single server(say Ubuntu).\n\n\nEvery request comes to nginx and asks for which gunicorn application\n  should it go and it redirects it.\n\nNOTE - Gunicorn cannot serve static files automatically as your local django server does. So you will need nginx for that again.","Q_Score":46,"Tags":"python,nginx,flask,gunicorn","A_Id":43045007,"CreationDate":"2017-03-27T11:05:00.000","Title":"What is the purpose of using nginx with gunicorn?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to use gunicorn for a REST API application with Flask\/Python. What is the purpose of adding nginx here to gunicorn? The gunicorn site recommends using gunicorn with nginx.","AnswerCount":5,"Available Count":3,"Score":0.1194272985,"is_accepted":false,"ViewCount":31058,"Q_Id":43044659,"Users Score":3,"Answer":"In production nginx works as reverse proxy.  It means users will hit nginx from browser and nginx will forward the call to your application.\nHope this helps.","Q_Score":46,"Tags":"python,nginx,flask,gunicorn","A_Id":43044788,"CreationDate":"2017-03-27T11:05:00.000","Title":"What is the purpose of using nginx with gunicorn?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to use gunicorn for a REST API application with Flask\/Python. What is the purpose of adding nginx here to gunicorn? The gunicorn site recommends using gunicorn with nginx.","AnswerCount":5,"Available Count":3,"Score":1.0,"is_accepted":false,"ViewCount":31058,"Q_Id":43044659,"Users Score":9,"Answer":"Gunicorn is an application server for running your python application instance.\nNGINX is a reverse proxy. It accepts incoming connections and decides where they should go next. It is in front of Gunicorn.","Q_Score":46,"Tags":"python,nginx,flask,gunicorn","A_Id":43044819,"CreationDate":"2017-03-27T11:05:00.000","Title":"What is the purpose of using nginx with gunicorn?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'd like to reverse engineer Selenium WebDriver to write my tests for me as I use it. This would entail opening a WebDriver on screen, and clicking around and using it as normal. It will output instructions like self.driver.find_element_by_id('username-box') or whatnot for me, instead of the time-wasting of right-clicking the \"Inspect element\" each time I write a test.\nIdeally this will give me a nice xpath which is more exact. How do I retrieve the Xpath\/way to recreate actions when manually using Selenium WebDriver?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":43,"Q_Id":43051032,"Users Score":0,"Answer":"As Nameless said, it won't solve the \"make me an efficient XPath\", etc. problem that you are talking about but you can install Selenium IDE (a FF plugin) and record your scenarios and then export them into various languages. It doesn't write the best code but you can get an idea of what it does with a quick download and install.","Q_Score":0,"Tags":"java,python,selenium,selenium-webdriver","A_Id":43053997,"CreationDate":"2017-03-27T15:53:00.000","Title":"How to retrieve HTML information about specific actions using WebDriver","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created python 3.5.2 virtual environment (\"python --version\" confirms that) \nbut when i try to install django using \"pip install django~=1.10.0\" I get this message: \n\nRequirement already satisfied: django~=1.10.0 in \/usr\/local\/lib\/python2.7\/dist-packages\n\nHow can I get django version that agrees with the python version in my venv?","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":114,"Q_Id":43060735,"Users Score":0,"Answer":"Ok - so I figured out what happened. I have installed django using sudo pip install. Even though I was in the venv (created with python3) this has resulted in reference to django outside the venv. Sooo...it was an interesting thing to learn I guess.","Q_Score":1,"Tags":"django,python-2.7,python-3.x,python-venv","A_Id":43073626,"CreationDate":"2017-03-28T04:40:00.000","Title":"virtual env python 3.5 only finds django python 2.7","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created python 3.5.2 virtual environment (\"python --version\" confirms that) \nbut when i try to install django using \"pip install django~=1.10.0\" I get this message: \n\nRequirement already satisfied: django~=1.10.0 in \/usr\/local\/lib\/python2.7\/dist-packages\n\nHow can I get django version that agrees with the python version in my venv?","AnswerCount":3,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":114,"Q_Id":43060735,"Users Score":0,"Answer":"Probabily you have already installed django outside the venv with python2.\njust write see in the pip list if django is installed.\nThen uninstall, enter in the venv and reinstall django with python3","Q_Score":1,"Tags":"django,python-2.7,python-3.x,python-venv","A_Id":43069102,"CreationDate":"2017-03-28T04:40:00.000","Title":"virtual env python 3.5 only finds django python 2.7","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to using python, so bear with me if I make any assumptions.. So I have virtualenv and pip installed in my ubuntu machine. Every time I create a virtual environment I have to remotely download and install python modules(using pip install) such as django already installed in the main python package. \nThe problem is that I am not always connected to the internet. Is there a way I can load modules existing in the main Python to every virtual environment I create? Thanks!","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":323,"Q_Id":43064496,"Users Score":1,"Answer":"You can pip download the Python packages you want to install offline and then install the .whl files in your virtualenv. Here is an example with Django and Requests:\n\nCreate a directory to store local Python packages:\nmkdir local_python\nChange directory: cd local_python\nDownload Python packages to be available offline:\npip download django requests\nInstall local package .whl files after you activate your virtualenv:\npip install Django-1.11.1-py2.py3-none-any.whl requests-2.16.5-py2.py3-none-any.whl","Q_Score":1,"Tags":"python,pip,virtualenv","A_Id":44232164,"CreationDate":"2017-03-28T08:32:00.000","Title":"Option to import global packages into virtual environment I create?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to have certain users fill out a specific form on login. Django should redirect the user to the form, whenever a certain condition is True for that user. \nI used a custom middleware to do it, but I am curious if there is a better approach.\nAny ideas?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":203,"Q_Id":43064625,"Users Score":0,"Answer":"The middleware is the way to go for this problem, it's the only method that's truly reliable and configurable.","Q_Score":0,"Tags":"python,django","A_Id":43066067,"CreationDate":"2017-03-28T08:38:00.000","Title":"Django force user to fill out form on login","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"What I want is that when I have looked up a user in a table, I want to list all the file urls that the user have access to. My first thought was to have a field in the table with a list of file URLs. However, I have now understood that there are no such field type. \nI was then thinking that maybe ForeignKeys might work, but I am having trouble getting my head around it. \nAnother solution maybe is to have one table for each user, with each row representing each file.\nWhat would you say is best practice in this case? \nI am also going to expand into having shared files, but thought that I'd address this issue first.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":25,"Q_Id":43066877,"Users Score":0,"Answer":"2 tables: user and user_uri_permission? 2 columns in the second: userID and URI. When the User-URI pair is in the table the use has access.","Q_Score":0,"Tags":"mysql,mysql-python","A_Id":43179890,"CreationDate":"2017-03-28T10:18:00.000","Title":"Mapping users to all of their files(URLs) in a mysql database.","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am editing a content from table which has pagination in it. If i update a user which is at the page no 9 and save that user, it will return me to page no 1.\nI want it to return to a same page where user was previously there that is at page no 9.\nAny help regarding the same would be appreciated!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":134,"Q_Id":43093142,"Users Score":1,"Answer":"You need to pass to the editing page the page number you were on, in a query parameter. And keep track of it and when editing\/updating is successful you redirect back to that page number.\nIn your form include a next field. Where to redirect in case of success.","Q_Score":0,"Tags":"python,django,pagination,django-pagination","A_Id":43093197,"CreationDate":"2017-03-29T12:09:00.000","Title":"Django: How to return a user to correct pagination page after editing or updating?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So is it possible to mix 2 ORM's in same web app,and if so how optimal would it be ? Why so?\n- I'm working on a web app in flask using flask-mysqldb and I came to a point where I need to implement an auth system, and on flask-mysqldb there's no secure way to do it.\n- With that said now I'm trying to implement flask-security but it only works on flask-sqlalchemy so I'm trying to mix sqlalchemy with mysqldb and before that I want to know if it's optimal and if it works.That would lead to using user auth along sqlalchemy and other data to mysqldb.Thanks!","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":145,"Q_Id":43098668,"Users Score":1,"Answer":"It's possible, but not recommended. Consider this:\n\nHalf of your app will not benefit from anything a proper ORM offers\nAdding a field to the table means editing raw SQL in many places, and then changing the model.\nDon't forget to keep them in sync.\n\nAlternatively, you can port everything that uses raw mysqldb to use SQLAlchemy:\n\nNeed to add a field to your table? Just change the model in one place.\nDon't like SQL queries that ORM generates for you? You still have a low-level control over this.","Q_Score":0,"Tags":"python,flask,flask-sqlalchemy,flask-mysql","A_Id":43098951,"CreationDate":"2017-03-29T16:03:00.000","Title":"Is it possible to mix 2 ORMS in same web app?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So is it possible to mix 2 ORM's in same web app,and if so how optimal would it be ? Why so?\n- I'm working on a web app in flask using flask-mysqldb and I came to a point where I need to implement an auth system, and on flask-mysqldb there's no secure way to do it.\n- With that said now I'm trying to implement flask-security but it only works on flask-sqlalchemy so I'm trying to mix sqlalchemy with mysqldb and before that I want to know if it's optimal and if it works.That would lead to using user auth along sqlalchemy and other data to mysqldb.Thanks!","AnswerCount":2,"Available Count":2,"Score":0.2913126125,"is_accepted":false,"ViewCount":145,"Q_Id":43098668,"Users Score":3,"Answer":"You can have a module for each orm. One module can be called auth_db and the other can be called data_db. In your main app file just import both modules and initialize the database connections. That being said, this approach will be harder to maintain in the future, and harder for other developers to understand what's going on. I'd recommend moving your flask-mysqldb code to sqlalchemy so that you are only using one ORM.","Q_Score":0,"Tags":"python,flask,flask-sqlalchemy,flask-mysql","A_Id":43098934,"CreationDate":"2017-03-29T16:03:00.000","Title":"Is it possible to mix 2 ORMS in same web app?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Python\/Flask web application that I am deploying via Gunicorn in a docker image on Amazon ECS. Everything is going fine, and then suddenly, including the last successful request, I see this in the logs:\n[2017-03-29 21:49:42 +0000] [14] [DEBUG] GET \/heatmap_column\/e4c53623-2758-4863-af06-91bd002e0107\/ADA\n[2017-03-29 21:49:43 +0000] [1] [INFO] Handling signal: term\n[2017-03-29 21:49:43 +0000] [14] [INFO] Worker exiting (pid: 14)\n[2017-03-29 21:49:43 +0000] [8] [INFO] Worker exiting (pid: 8)\n[2017-03-29 21:49:43 +0000] [12] [INFO] Worker exiting (pid: 12)\n[2017-03-29 21:49:43 +0000] [10] [INFO] Worker exiting (pid: 10)\n...\n[2017-03-29 21:49:43 +0000] [1] [INFO] Shutting down: Master\n\nAnd the processes die off and the program exits. ECS then restarts the service, and the docker image is run again, but in the meanwhile the service is interrupted.\nWhat would be causing my program to get a TERM signal? I can't find any references to this happening on the web. Note that this only happens in Docker on ECS, not locally.","AnswerCount":4,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":11790,"Q_Id":43104913,"Users Score":0,"Answer":"For me, it turned out that the worker was quitting due to one of the containers in my Docker Swarm stack was failing repeatedly, resulting in the rollback process. The gunicorn process received the signal 'term' when the rollback process began.","Q_Score":13,"Tags":"python,docker,flask,gunicorn,amazon-ecs","A_Id":71013193,"CreationDate":"2017-03-29T21:58:00.000","Title":"Why are my gunicorn Python\/Flask workers exiting from signal term?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a Python\/Flask web application that I am deploying via Gunicorn in a docker image on Amazon ECS. Everything is going fine, and then suddenly, including the last successful request, I see this in the logs:\n[2017-03-29 21:49:42 +0000] [14] [DEBUG] GET \/heatmap_column\/e4c53623-2758-4863-af06-91bd002e0107\/ADA\n[2017-03-29 21:49:43 +0000] [1] [INFO] Handling signal: term\n[2017-03-29 21:49:43 +0000] [14] [INFO] Worker exiting (pid: 14)\n[2017-03-29 21:49:43 +0000] [8] [INFO] Worker exiting (pid: 8)\n[2017-03-29 21:49:43 +0000] [12] [INFO] Worker exiting (pid: 12)\n[2017-03-29 21:49:43 +0000] [10] [INFO] Worker exiting (pid: 10)\n...\n[2017-03-29 21:49:43 +0000] [1] [INFO] Shutting down: Master\n\nAnd the processes die off and the program exits. ECS then restarts the service, and the docker image is run again, but in the meanwhile the service is interrupted.\nWhat would be causing my program to get a TERM signal? I can't find any references to this happening on the web. Note that this only happens in Docker on ECS, not locally.","AnswerCount":4,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":11790,"Q_Id":43104913,"Users Score":16,"Answer":"It turned out that after adding a login page to the system, the health check was getting a 302 redirect to \/login at \/, which was failing the health check. So the container was periodically killed. Amazon support is awesome!","Q_Score":13,"Tags":"python,docker,flask,gunicorn,amazon-ecs","A_Id":43105563,"CreationDate":"2017-03-29T21:58:00.000","Title":"Why are my gunicorn Python\/Flask workers exiting from signal term?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I want to test my django app in my WAMP server. The idea is that i want to create a web app for aaa.com and aaa.co.uk, if the user enter the domain aaa.co.uk, my django app will serve the UK version, if the user go to aaa.com, the same django app will serve the US version (different frontend). Basically i will be detecting the host of the user and serve the correct templates.\nHow do i setup my WAMP so i can test this? right now i am using pyCharm default server which is 127.0.0.1:8000","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":3505,"Q_Id":43107173,"Users Score":2,"Answer":"Ok the answer is basically  ericeastwood.com\/blog\/3\/django-setup-for-wamp  combined with httpd.apache.org\/docs\/2.4\/vhosts\/name-based.html \u2013 shadow","Q_Score":0,"Tags":"python,django,wamp","A_Id":43772665,"CreationDate":"2017-03-30T01:57:00.000","Title":"how do i setup django in wamp?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm working on a robot that uses a CNN that needs much more memory than my embedded computer (Jetson TX1) can handle. I was wondering if it would be possible (with an extremely low latency connection) to outsource the heavy computations to EC2 and send the results back to the be used in a Python script. If this is possible, how would I go about it and what would the latency look like (not computations, just sending to and from).","AnswerCount":3,"Available Count":2,"Score":0.0665680765,"is_accepted":false,"ViewCount":99,"Q_Id":43107807,"Users Score":1,"Answer":"Possible: of course it is.\nYou can use any kind of RPC to implement this. HTTPS requests, xml-rpc, raw UDP packets, and many more. If you're more interested in latency and small amounts of data, then something UDP based could be better than TCP, but you'd need to build extra logic for ordering the messages and retrying the lost ones. Alternatively something like Zeromq could help.\nAs for the latency: only you can answer that, because it depends on where you're connecting from. Start up an instance in the region closest to you and run ping, or mtr against it to find out what's the roundtrip time. That's the absolute minimum you can achieve. Your processing time goes on top of that.","Q_Score":2,"Tags":"python,amazon-web-services,amazon-ec2,hpc,grid-computing","A_Id":43107922,"CreationDate":"2017-03-30T03:08:00.000","Title":"Possible to outsource computations to AWS and utilize results locally?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm working on a robot that uses a CNN that needs much more memory than my embedded computer (Jetson TX1) can handle. I was wondering if it would be possible (with an extremely low latency connection) to outsource the heavy computations to EC2 and send the results back to the be used in a Python script. If this is possible, how would I go about it and what would the latency look like (not computations, just sending to and from).","AnswerCount":3,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":99,"Q_Id":43107807,"Users Score":1,"Answer":"I think it's certainly possible. You would need some scripts or a web server to transfer data to and from. Here is how I think you might achieve it:\n\nSend all your training data to an EC2 instance \nTrain your CNN \nSave the weights and\/or any other generated parameters you may need\nConstruct the CNN on your embedded system and input the weights\nfrom the EC2 instance. Since you won't be needing to do any training\nhere and won't need to load in the training set, the memory usage\nwill be minimal. \nUse your embedded device to predict whatever you may need\n\nIt's hard to give you an exact answer on latency because you haven't given enough information. The exact latency is highly dependent on your hardware, internet connection, amount of data you'd be transferring, software, etc. If you're only training once on an initial training set, you only need to transfer your weights once and thus latency will be negligible. If you're constantly sending data and training, or doing predictions on the remote server, latency will be higher.","Q_Score":2,"Tags":"python,amazon-web-services,amazon-ec2,hpc,grid-computing","A_Id":43107931,"CreationDate":"2017-03-30T03:08:00.000","Title":"Possible to outsource computations to AWS and utilize results locally?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am thinking to use AWS API Gateway and AWS Lambda(Python) to create a serverless API's , but while designing this i was thinking of some aspects like pagination,security,caching,versioning ..etc \nso my question is: \nWhat is the best approach performance & cost wise to implement API pagination with very big data (1 million records)? \n\nshould i implement the pagination in postgresql db? (i think this\nwould be slow)\nshould i not use postgresql db pagination and just cache all the results i get from db into aws elastic cache and then do server side pagination in lambda.\n\nI appreciate your help guys.","AnswerCount":1,"Available Count":1,"Score":0.537049567,"is_accepted":false,"ViewCount":1679,"Q_Id":43113198,"Users Score":3,"Answer":"If your data is going to live in a postgresql data base anyway I would start with your requests hitting the database and profile the performance. You've made assumptions about it being slow but you haven't stated what your requirements for latency are or what your schema is, so any assertions people would make about whether or not it would fit your case is completely speculative.\nIf you do decide that after profiling that it is not fast enough, than adding a cache would make sense, though storing the entire contents in the cache seems wasteful unless you can guarantee your clients will always iterate through all results. You may want to consider a mechanism that prefetches blocks of data that would service a few requests rather than trying to cache the whole data.\nTL;DR : Don't prematurely optimize your solution. Quantify how you want your system to respond and test and validate your assumptions.","Q_Score":1,"Tags":"python,postgresql,amazon-web-services,aws-lambda,aws-api-gateway","A_Id":43126859,"CreationDate":"2017-03-30T09:04:00.000","Title":"AWS API Gateway & Lambda - API Pagination","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using webkit.WebView in Python to display html generated from Markdown. I can display an image from a local file by generating an img tag with an absolute src path, but a realtive path doesn't work. The html with the relative path displays the image OK in Firefox. Is this a known problem with webkit and if so is there a soultion?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":94,"Q_Id":43123395,"Users Score":0,"Answer":"Answering my own question .... I realised I was using the WebView's load_string function, rather than writing the html to a file and loading that. This means that there is no html file as a base uri to load the image relative to.\nThe designers have obviously thought of this and provided a base_uri parameter, which I had just set to \"File:\/\/\". Changing this to a path which makes sense in conjunction with the relative path to the image file fixes the problem.\nHope this will be useful to someone who may have the same problem.","Q_Score":0,"Tags":"python","A_Id":43159587,"CreationDate":"2017-03-30T16:24:00.000","Title":"Relative image paths in html displayed by webkit","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is 'scrapy' compatible with Python 3(or later) on Windows?\nIf not, then is the only option to use it with Python 2.7?\nI need this for a project I need to do.\nThank you.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":1291,"Q_Id":43137423,"Users Score":1,"Answer":"Yes, it is, you can install it via \npip install scrapy\n(You may want to activate your virtual environment first)","Q_Score":0,"Tags":"python,python-3.x,web-scraping,scrapy","A_Id":43137750,"CreationDate":"2017-03-31T09:39:00.000","Title":"Is Scrapy compatible with Python 3 on Windows?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on a python\/tornado web application.\nI have several options to save in my app.\nThoses options can by changed by the user, and those options will be access very often.\nI have created an sqlite database but there is some disk operation and i am asking you what is the best location for those options.\nDoes tornado embed a feature for custom user options ?\nThanks","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":28,"Q_Id":43145705,"Users Score":0,"Answer":"Yes, there is the tornado.options package, which does pretty much what you need. Keep in mind, however, that the values saved here are not persisted between requests; if you need that kind of functionality, you will have to implement an external persistence solution, which you already have done with SQLite.","Q_Score":0,"Tags":"python,tornado","A_Id":43171572,"CreationDate":"2017-03-31T16:39:00.000","Title":"Where should i save my tornado custom options","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have PhpMyAdmin to view and edit a database and a Flask + SQLAlchemy app that uses a table from this database. Everything is working fine and I can read\/write to the database from the flask app. However, If I make a change through phpmyadmin, this change is not detected by SQLAlchmey. The only to get those changes is by manually refreshing SQLAlchmey connection \nMy Question is how to tell SQLAlchemy to reload\/refresh its Database connection?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":665,"Q_Id":43149092,"Users Score":0,"Answer":"I suggest you to look at Server Sent Events(SSE). I am looking for code of SSE for postgres,mysql,etc. It is available for reddis.","Q_Score":0,"Tags":"python,flask,sqlalchemy,flask-sqlalchemy","A_Id":43703427,"CreationDate":"2017-03-31T20:22:00.000","Title":"Flask App using SQLAlcehmy: How to detect external changes committed to the database?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"server.build_job(self.job_full_name, parameters=params) when parameters is not None, jenkins.JenkinsException: Error in request. Possibly authentication failed [500]: Server Error occurs. It works when parameters=None.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2304,"Q_Id":43155042,"Users Score":2,"Answer":"The problem may appear when the job you are trying to build with python-jenkins doesn't require any parameters, so if you try to pass some, it just fails.\nPlease, doublecheck this.\nHope, it will help","Q_Score":1,"Tags":"python,jenkins,continuous-integration","A_Id":43264504,"CreationDate":"2017-04-01T09:25:00.000","Title":"500 server error when using jenkins python module build_job(job_name, parameters=) method","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am directing this question to experienced, Django developers, so as in subject, I have been learning Django since September 2016, but I've started to learn it without any knowledge about databases syntax. I know basic concepts and definitions, so I can easily implement in Django models. Summarizing, have I to know SQL to create web apps in Django? Thanks in advance.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":1361,"Q_Id":43161718,"Users Score":1,"Answer":"You do not have to be a wizard at it but understanding relations between data sets can be extremely helpful especially if you have a complicated data hierarchy. \nJust learn as you go. If you want you can look at the SQL code Django executes for you in the migrations.py file of each app.","Q_Score":1,"Tags":"python,sql,django","A_Id":43164854,"CreationDate":"2017-04-01T20:33:00.000","Title":"Do I need to know SQL when I work with Django","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Django documentation says:\n\nget_absolute_url() method to tell Django how to calculate the canonical URL for an object.\n\nWhat is canonical URL mean in this is context?\nI know from an SEO perspective that canonical URL means picking the best URL from the similar looking URLs (example.com , example.com\/index.html). But this meaning doesn't fit in this context.\nI know this method provides some additional functionality in Django admin, redirection etc. And I am fully aware of how to use this method.\nBut what is the philosophy behind it? I have never actually used it in my projects. Does it serve any special purpose?","AnswerCount":4,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":37142,"Q_Id":43179875,"Users Score":10,"Answer":"You create models for your website. When a new instance is made for a model, django must know where to go when a new post is created or a new instance is created.\nHere get_absolute_url comes in picture. It tells the django where to go when new post is created.","Q_Score":43,"Tags":"python,django","A_Id":54591055,"CreationDate":"2017-04-03T08:29:00.000","Title":"When to use Django get_absolute_url() method?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"This is more of a conceptual question. While learning the Django class-based view, I am wondering if it is possible to make a call to a Django view as an initiation call. I mean, after the first call, the following calls from the templates can share the instance variables created by the first one. This avoids passing variables back and forth between the template and server.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":60,"Q_Id":43184937,"Users Score":2,"Answer":"No. Django views are specifically designed to prevent this. It would be a very bad idea; any instance variables set would be shared by all future users of that process, leading to potential information leakage and other thread-safety bugs. \nIf you want to store information between requests, use the session.","Q_Score":2,"Tags":"python,django","A_Id":43184995,"CreationDate":"2017-04-03T12:40:00.000","Title":"Initiation call Django class based view.","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We are using the Django framework and in the book \"2 scoops of django\" there is a recommendation to use underscore naming for specific things, should this be included in the naming of templates as well? front end developers here are really locked on dashes and I was just wondering?","AnswerCount":1,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":913,"Q_Id":43193286,"Users Score":8,"Answer":"I think one reason why underscores are better in Python files is so that they can be imported. A dash is interpreted as a minus sign, which can cause problems. \nFor your Django templates, it's a matter of preference so you will likely be fine using any convention you prefer.","Q_Score":5,"Tags":"python,html,django,django-templates,naming-conventions","A_Id":43193334,"CreationDate":"2017-04-03T20:01:00.000","Title":"Django template naming with dashes VS underscores","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I downloaded a Python wrapper called rawpy recently using easy_install (pip install did not work). When I imported it and attempted to run code, this error appeared: \"ImportError: DLL load failed: The application has failed to start because its side-by-side configuration is incorrect. Please see the application event log or use the command-line sxstrace.exe tool for more detail.\"\nCould anyone offer a fix for this?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2176,"Q_Id":43196821,"Users Score":0,"Answer":"I looked at similar questions on SO and found that a common theme was that they had incorrect versions of whatever they were working with. I decided to switch to Python 3.5.3 over 2.7; this fixed the problem, but a new error \"ImportError: No module named 'rawpy'\" appeared. This is because the module is now in the incorrect directory. I was able to fix this by uninstalling and reinstalling the module using pip.","Q_Score":0,"Tags":"python,import","A_Id":43220261,"CreationDate":"2017-04-04T01:23:00.000","Title":"ImportError: DLL load failed: The application has failed to start because its side-by-side configuration is incorrect","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am writing API in python, When i read the react js documentation it describe's lot about view layer and JSX and i didn't find any good tutorial to start with and apart from that im confused with technology decision shall i go with these technologies or not.\nhelp me in taking right decision.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":354,"Q_Id":43204913,"Users Score":1,"Answer":"Just posting @Sami's comment as an answer so you can accept it.\n\nThe React site itself has quite good documentation. It doesn't care what the backend is, or if there even is a backend. That's all up to you. So to your question in the title: yes, you can. As for should you, that's an opinion based question and not a good fit for Stack Overflow.","Q_Score":0,"Tags":"python,django,reactjs","A_Id":43205392,"CreationDate":"2017-04-04T10:41:00.000","Title":"I am newbie to react.js can i use python as a backend and react as a frontend for data science application","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to generated unique Ids in distributed manner. Some at server side and another at client side. Server side programming language can be ruby and python while client side is javascript.\nI am plannning to use simpleflake libraries for respective languages.\nCan I assume that the ids will never collide?\nOR they can collide often, due to the implementation details in different packages?\nThanks in advance.\n-Amit","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":317,"Q_Id":43248083,"Users Score":1,"Answer":"I haven't used Simpleflake itself, but have been using a similar scheme for years, though I use 128 bits instead of 64.\nThe key ingredient is that most of the bits are random. So even if your libraries choose a slightly different number of bits for the timestamp portion, or a different granularity then the likelihood of collisions is low. Of course, in such cases it lessens the speed improvements in the database.\nI imagine that some Simpleflake implementation is \"standard\" and the other implementations are straight ports---keeping compatibility and characteristics. If not, shame on them for using Simpleflake in their name.","Q_Score":3,"Tags":"javascript,python,uniqueidentifier,distributed-system","A_Id":43288043,"CreationDate":"2017-04-06T07:08:00.000","Title":"Are simpleflake ids generarated in different languages consistent?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Hi I have two process \n\nDjango and MYSQL \nnode\/express and mongo db.\n\n1.\nHow can I configure this two process to point to different url\nlike. Django point to api.abc.com\/v1 and node point to api.abc.com\/v2 ?\n2.\nall my user login is inside Django and MYSQL with OAuth. I can authenticate user in Django.\nBut how can authenticate user in nodejs app with the token send by Django REST OAuth ?\nThanks.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":1050,"Q_Id":43253823,"Users Score":1,"Answer":"Scenario A\nYou create a url in django ^v2\/.*$ and then make a request from django view to node.js process. this way django can handle user auth and permissions and node can be standalone and not know anything about user auth. If you need user data (id or something) you can inject it in the request as a header or a cookie. \nScenario B\nYou dig into django REST OAuth implementation, find where tokens are stored in db, and on each request you take the oauth token from the header\/cookie and compare it to the one in DB. You would have to setup nginx as a reverse proxy and route all traffic that goes on url \/v1\/.*$ to django app, and all traffic that goes to \/v2\/.*\/ to node app.\nEither options are doable but I would suggest Scenario A. It's easier, quicker and far less error prone.","Q_Score":1,"Tags":"node.js,django,python-2.7,oauth-2.0,nodes","A_Id":43254420,"CreationDate":"2017-04-06T11:26:00.000","Title":"Django and Node processes for the same domain","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Which is the good python package\/library for integrating MS Exchange in Python.: PyExchange or exchangelib .\nI am trying to integrate MS Exchange with Odoo 10, please advise me with the best package to do it. I tried some of the functions of exchangelib . eg: bulk_create, account.calendar.all(), etc and working.But some functions bulk_update, bulk_delete is not working.\nAm not able to update the values from Odoo to MS Exchange calender because it shows error:\n\nAttributeError: 'Calendar' object has no attribute 'bulk_update'\nAttributeError: 'Calendar' object has no attribute 'bulk_delete'\n\nplease advise","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":310,"Q_Id":43256137,"Users Score":0,"Answer":"bulk_update() and bulk_delete() are methods on the Account class, not the Folder class. That's why you're getting the AttributeError.","Q_Score":1,"Tags":"python,outlook,openerp,exchange-server,pyexchange","A_Id":45020552,"CreationDate":"2017-04-06T13:06:00.000","Title":"Microsoft Exchange Integration in Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Django project with 5 different PostgreSQL databases.  The project was preemptively separated in terms of model routing, but has proven quite problematic so now I'm trying to reverse it.  Unfortunately, there's some overlap of empty, migrated tables so pg_dump's out of the question.  It looks like django-dumpdb may suit my needs but it doesn't handle per-database export\/import.  Additionally, Django's dumpdata\/loaddata are installing 0 of the records from generated fixtures.  Can I have some suggestions as to the least painful way to merge the data?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":650,"Q_Id":43266059,"Users Score":1,"Answer":"there's always the dump data from django, which is pretty easy to use.\nor you could do this manually:\n\nif the 2 databases share the same data (they are mirror one to another) and the same table structure, you could just run a syncdb from django to create the new table structure and then dump and import (i'm assuming you're using mysql, but the general idea is the same) the old database into the new one\nif the two databases share different data (still with the same structure) you should import every single row of the two databases: this way, you'll keep relations etc, but you'll have your unique id updated to the new sole db.\nif the two databases are different in both data and structure, you'll have to run two sincdb and two imports, but this doesn't seem to be your case","Q_Score":2,"Tags":"python,django,postgresql,django-models,django-database","A_Id":43267208,"CreationDate":"2017-04-06T21:27:00.000","Title":"How to intelligently merge Django databases?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"as of right now I have a file called song.mp3 that I have integrated into a Python program which will act as an alarm. I would like it so that whenever I send the Raspberry Pi a new song via Bluetooth, it will just automatically rename this song to be song.mp3, thereby overwriting the previous song. That way I don't have to change my alarm program for different songs. Any help?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":141,"Q_Id":43267632,"Users Score":0,"Answer":"Assuming that the mp3 files are all in the same directory, you could perhaps have a cron job running that periodically renames the most recent file and so something like:\nmv $(ls -1t *.txt | head -1) song.mp3\nThis is a quick example. It would be more preferable to add the ablve to a script and add some \"belts and braces\" to ensure that the script doesn't crash.","Q_Score":0,"Tags":"python,bash,bluetooth,rename,overwrite","A_Id":43277093,"CreationDate":"2017-04-07T00:00:00.000","Title":"Automatically overwrite existing file with an incoming file","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I noticed that I sometimes get blocked while scraping because of a session cookie being used on too many pages.\nIs there a way to simply clear all cookies completely during crawling to get back to the initial state of the crawler?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":879,"Q_Id":43275741,"Users Score":0,"Answer":"Facing the similar situation myself. I can get away easily here, but one idea that I have is to subclass CookieMiddleware and then write a method to tweak jar variable directly. It's dirty, but maybe is worth consideration.\nAnother option would be to write a feature request to at least have a function to clear the cookies. Can easily take another year to implement, if deemed needed at all, I don't particularly trust scrapy devs here.\nJust occured to me, that you can use your own cookiejar meta, and if you want to return to the clean state, you simply use different value (something like incrementing an integer would do).","Q_Score":2,"Tags":"python,cookies,scrapy","A_Id":44177895,"CreationDate":"2017-04-07T10:25:00.000","Title":"Clear cookies on scrapy completely instead of changing them","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How to run flask (A Python Microframework) on Vesta Panel?\nIt's not specialized question for Flask. I'm asking django, flask, cherrypy, sanic, nodejs, strongloop etc.\nIt's looks like basic question but vesta panel wrote with PHP and using apache, nginx. It's complicated. Python and NodeJS using their own socket.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":708,"Q_Id":43276189,"Users Score":1,"Answer":"You will have to build them from source yourself or use binaries.\nIf you build them you will probably need to pass user directory parameters to the build, e.g.: you will have to crete \"\/opt\", \"\/lib\", \"\/tmp\" and other root folders and point the build to them.\nElse just place the binaries in the \/bin folder, create it if it doesn't exist, add it to your $PATH and use them directly.","Q_Score":0,"Tags":"python,node.js,flask,vesta","A_Id":43281169,"CreationDate":"2017-04-07T10:46:00.000","Title":"Flask, Django, NodeJS on Vesta Panel","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How do I change the browser used by the view(response) command in the scrapy shell?  It defaults to safari on my machine but I'd like it to use chrome as the development tools in chrome are better.","AnswerCount":4,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1418,"Q_Id":43299688,"Users Score":0,"Answer":"This fixed it for me:\nIf you're on windows 10, find or create a random html-file on your system.\n\nRight click the html-file\nOpen with\nChoose another app\nSelect your browser (e.g Google Chrome) and check the box \"Always use this app to open .html\"\n\nNow attempt to use view(response) in the Scrapy shell again and it should work.","Q_Score":2,"Tags":"python,scrapy","A_Id":62831415,"CreationDate":"2017-04-08T19:51:00.000","Title":"How do I change the browser used by the scrapy view command?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Suppose, I am making a movie rating app. A logged-in user should be able to rate the movie with stars (in the range 1 to 5).\nI want to quickly access all the rater's name along with their rating. \nIf a user rates the movie again, the rating should be updated. At the same time, if a user decides to withdraw his rating i.e. provide zero rating, I would like to remove the entry from the field.\nI believe dictionary would be the best choice to achieve the same. However, I am open for suggestions.\nI also want a user to see all the movies the he\/she has rated along with the rating.","AnswerCount":4,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":66,"Q_Id":43321447,"Users Score":2,"Answer":"You should create an ForeignKey field between the user model and the voting model. To only allow a single vote, per user; per movie, you might want to create a unique key constraint, on the voting model, over the userid and the movieid.\nThe vote should then contain a relation to the movie and a rating. If a user withdraws his vote you remove it from database.\nUsing a dictionary will lead to problems for you as you will have multiple movies.\nTo increase the speed and performance counting the votes you might want to take a look at caching and simply cache the number of votes and update the number every time a vote was added\/withdrawn by a user on the specific movie.","Q_Score":1,"Tags":"python,django,django-models,django-model-utils","A_Id":43321849,"CreationDate":"2017-04-10T11:01:00.000","Title":"Is there a way to have dictinary-like field in Django model?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am making a Django application and I am running into an issue. I know Python is interpreted and it would be impossible to completely fight against piracy, however I want to implement some sort of security\/licensing feature for my application.\nI thought I would post the question because I can't find much information about this online. I'm not sure if I should create some sort of installer which downloads files from a server depending on if a key is valid or not and installs them onto a users host, or if I should encrypt the files upon sending and decrypt them with a key.\nIf anybody has any pointers or if anybody has faced this before I'd love to hear!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1487,"Q_Id":43348620,"Users Score":0,"Answer":"This is very late. but I have implemented license validation through python java bridge. I am generating tokens at the device level. and put a valid key according to that token so that it doesn't work on another device. and I have disabled the main feature for an invalid license key. and also compiled source code in deployment. however, it is not difficult to decompile code but at least we can prevent a normal user.","Q_Score":3,"Tags":"python,django,security","A_Id":72083078,"CreationDate":"2017-04-11T14:19:00.000","Title":"Protecting or Licensing a Django Application","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Django has many management commands. In addition, we can write our own commands.\nWhat happens after I make a shell call python manage.py XXX?\nWill the code be executed in a process that launched from the shell?\nOr the shell process just communicates with the main Django process that executes the command?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":485,"Q_Id":43348971,"Users Score":4,"Answer":"The shell starts a new process to run the Python interpreter.  The Python interpreter reads manage.py and executes it directly.  There's no such thing as \"the main Django process\".","Q_Score":2,"Tags":"python,django,shell","A_Id":43349037,"CreationDate":"2017-04-11T14:34:00.000","Title":"is the Django management command executed in a separate process?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"xunitmerge create duplicate tests when merged the py.test results of two different set of tests.\nI have two test folders and ran them separately using py.test, which created results-1.xml &results-2.xml. after that i am merging as below.\nxunitmerge results-1.xml results-2.xml results.xml\nwhich created results.xml, when i publish the results using jenkins (publish xunit results) i see the tests recorded shown them as duplicate though the tests of results-1.xml and results-2.xml are unique.\nHow to avoid duplicate test results during merge?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":272,"Q_Id":43351833,"Users Score":0,"Answer":"Check that you didn't include the original results-1.xml and results-2.xml file in the path that Jenkins scan for results.\nIf you're not sure about it, try to delete the origin files after the merge (and before running the xunit-report action)","Q_Score":0,"Tags":"python,unit-testing,jenkins,pytest,xunit","A_Id":45173514,"CreationDate":"2017-04-11T16:47:00.000","Title":"xunitmerge does creates duplicate tests when merged the py.test results of two different set of tests","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Flask\/Python for what it matters. \nI need to have one user begin filling out a form, lets say question 1 and 2, and then save that form and send it via email to another user to finish the form, question 3. The second user then saves it again and the final product is stored. \nQuestion 1 would be a name field and question 2 would be a status field (like here, not going, etc) and question 3, the question for the second user, would be a 'yes' 'no' to confirm the information from the first user. \nThat description was just to outline the full workflow. If anyone can point me to some useful information and\/or examples how of how to send the uncompleted form for another use to finish I'd appreciate it.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":26,"Q_Id":43358798,"Users Score":1,"Answer":"You can define one model which contain three fields and define two forms. The first form contain question1 and question2. The second form inherit from the first form and add question3.\nThere are some views:\n\na view to show the first form to the first user to fill in\na view to save the first form data to the database(SQLALchemy) and send email to the second user that contain a url(with a id point to the data object) which map to the next view\na view which accept the id of data object and show the second form to the second user, in this view you can create the second form with form = Form2(obj=Data.query.get(id)) to populate data from data object\na view to save the second from data to the database(You only define one model and update the last field in this view function)","Q_Score":0,"Tags":"python,web,flask","A_Id":43359234,"CreationDate":"2017-04-12T01:37:00.000","Title":"Process for one user starting a form and another finishing it","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have configured credentials using aws configure.\naws configure list looks fine.Python\/django is able to locate the credentials in the shell_plus but unable to locate credentials when django is being run through gunicorn \/ supervisor.\nThis is weired","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1139,"Q_Id":43361364,"Users Score":2,"Answer":"When you run aws configure you will write files linked to your profile as they will be written in ~\/.aws\/config and ~\/.aws\/credentials.\nWhen you run your application, the application will look for those files using the same logic, ie.~\/.aws\/credentials.\nWhen in a shell, the interpreter will try to translate ~ to an absolute path based on $(whoami).\nTL;DR - You must run aws configure with the same user as your application is running with.","Q_Score":0,"Tags":"python,django,amazon-web-services,boto3","A_Id":43364021,"CreationDate":"2017-04-12T05:55:00.000","Title":"AWS credentials : unable to locate credentials in django python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am raising Value Error in my API because the input parameter of a particular function is not valid like below\n\nPassword doesn't match\nUser doesn't exist in db or the value is negative \n\nClient provided valid argument as per the API norms so I think Client side error is not the case(400 series code).\nSo whether I have to return status code as 200 because that request is totally processed or there should be a http status code for this.","AnswerCount":3,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":2334,"Q_Id":43363636,"Users Score":1,"Answer":"As there are various invalid types, you should use the most appropriate HTTP status code for each different situation, case by case.\nFor Password doesn't match, I think 403 Forbidden is the best choice.\nFor User doesn't exist in db, 204 No Content is the best one.\nFor value is negative, it depends on why value is negative.","Q_Score":1,"Tags":"python,http,http-status-codes,valueerror","A_Id":43363842,"CreationDate":"2017-04-12T07:59:00.000","Title":"What is the http status code when Api raises ValueError?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am raising Value Error in my API because the input parameter of a particular function is not valid like below\n\nPassword doesn't match\nUser doesn't exist in db or the value is negative \n\nClient provided valid argument as per the API norms so I think Client side error is not the case(400 series code).\nSo whether I have to return status code as 200 because that request is totally processed or there should be a http status code for this.","AnswerCount":3,"Available Count":2,"Score":0.0665680765,"is_accepted":false,"ViewCount":2334,"Q_Id":43363636,"Users Score":1,"Answer":"You should send another status code.\nA good example of a processed request which gives another status than 200 is the redirection 3xx. After submitting a form through a POST request, it is recommended that the server gives a 307 Temporary Redirect. However, the request was totally processed, and even succeeded.\nIn your case, something happened (an exception has been raised). Let the client know it by sending a adequate status. I would recommend 403 Forbidden or 401 Unauthorized.","Q_Score":1,"Tags":"python,http,http-status-codes,valueerror","A_Id":43363778,"CreationDate":"2017-04-12T07:59:00.000","Title":"What is the http status code when Api raises ValueError?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need a small help.\nI am new to postgres and django. I am creating a project in django where there will n number of clients and their data is saved into the database on monthly basis.\nSo my doubts is should i go with only a single table and save all the data inside it or do I have an option to create individual tables dynamically as the user approaches and then save the values into those table?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":324,"Q_Id":43367732,"Users Score":1,"Answer":"In fact you do not need to create a special table for each customer. SQL databases is designed in a manner to keep all similar data in one table. It is much easier to work with them in such a way.\nAt a moment I'd like to recommend to read about relational databases to better understand ways how to store data in it. Then you'll see how to better design application and data storage.","Q_Score":0,"Tags":"python,django,postgresql","A_Id":43369451,"CreationDate":"2017-04-12T11:01:00.000","Title":"Creating dynamic tables in postgres using django","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a project on GAE wich use Google Cloud Datastore.\nOf course, I have a development environment on my local machine(with local Datastore), and stage environment and production environment on the Google Cloud with two Datastores(stage & prod) for each environment.\nWhen I run a project on my local machine NDB connect me to my local Datastore. And it's a problem because I want to connect to Google Cloud Datastore\nHow can I run the project on my local machine and connect it Google Cloud Datastore(stage)? \nI use Python, and run the project via: \ndev_appserver.py app.yaml","AnswerCount":1,"Available Count":1,"Score":-0.3799489623,"is_accepted":false,"ViewCount":378,"Q_Id":43394318,"Users Score":-2,"Answer":"You have to specify the path to your codebase. IF you are running the command from the same folder, use .\ndev_appserver.py .","Q_Score":4,"Tags":"python,google-app-engine,google-cloud-datastore","A_Id":43394458,"CreationDate":"2017-04-13T13:59:00.000","Title":"Connect from local GAE project to Google Cloud Datastore","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am using python 2.7 and trying to install scrapy using pip but get this:\nException:\nTraceback (most recent call last):\n  File \"\/usr\/local\/lib\/python2.7\/dist-packages\/pip\/basecommand.py\", line 215, in main\n    status = self.run(options, args)\n  File \"\/usr\/local\/lib\/python2.7\/dist-packages\/pip\/commands\/install.py\", line 324, in run\n    requirement_set.prepare_files(finder)\n  File \"\/usr\/local\/lib\/python2.7\/dist-packages\/pip\/req\/req_set.py\", line 380, in prepare_files\n    ignore_dependencies=self.ignore_dependencies))\n  File \"\/usr\/local\/lib\/python2.7\/dist-packages\/pip\/req\/req_set.py\", line 634, in _prepare_file\n    abstract_dist.prep_for_dist()\n  File \"\/usr\/local\/lib\/python2.7\/dist-packages\/pip\/req\/req_set.py\", line 129, in prep_for_dist\n    self.req_to_install.run_egg_info()\n  File \"\/usr\/local\/lib\/python2.7\/dist-packages\/pip\/req\/req_install.py\", line 412, in run_egg_info\n    self.setup_py, self.name,\n  File \"\/usr\/local\/lib\/python2.7\/dist-packages\/pip\/req\/req_install.py\", line 387, in setup_py\n    import setuptools  # noqa\n  File \"\/root\/.local\/lib\/python2.7\/site-packages\/setuptools\/init.py\", line 12, in \n    import setuptools.version\n  File \"\/root\/.local\/lib\/python2.7\/site-packages\/setuptools\/version.py\", line 1, in \n    import pkg_resources\n  File \"\/root\/.local\/lib\/python2.7\/site-packages\/pkg_resources\/init.py\", line 72, in \n    import packaging.requirements\n  File \"\/root\/.local\/lib\/python2.7\/site-packages\/packaging\/requirements.py\", line 59, in \n    MARKER_EXPR = originalTextFor(MARKER_EXPR())(\"marker\")\nTypeError: call() takes exactly 2 arguments (1 given)","AnswerCount":3,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":3160,"Q_Id":43400703,"Users Score":3,"Answer":"Seems there's a problem with your pip installation. I have two options for you. \n1) Edit file \/usr\/lib\/python2.7\/site-packages\/packaging\/requirements.py and replace line \nMARKER_EXPR = originalTextFor(MARKER_EXPR())(\"marker\") \nwith\nMARKER_EXPR = originalTextFor(MARKER_EXPR)(\"marker\")\nOR\n2) Try and upgrade your pip installation with \npip install -U pip setuptools","Q_Score":1,"Tags":"linux,python-2.7,pip,installation","A_Id":43401090,"CreationDate":"2017-04-13T19:54:00.000","Title":"Linux pip package installation error","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have seen in Firebug that my browser sends requests even for all static files. This happened when I have enabled caching for static files.\nI also saw the server response with 304 status code.\nNow, my question:\nWhy should the browser send requests for all static files when the cache is enabled?\nIs there a way that the browser does not send any request for static files until the expiration of the cache?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":149,"Q_Id":43424090,"Users Score":-1,"Answer":"Browsers still send requests to the server in case the files are cached to get to know whether there are new contents to fetch. Note that the response code 304 comes from the server telling the browser that the contents it has cached are still valid, so it doesn't have to download them again.","Q_Score":0,"Tags":"caching,browser,static,python-requests","A_Id":43425459,"CreationDate":"2017-04-15T08:50:00.000","Title":"Why does browser send requests for static files?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My python version is 3.4.3 and my django version is 1.9.6 . I tried many django facebook registrations apps  but almost all the versions are outdated. \nWhat I want is to allow users to login via facebook and check if their friends are registered to my website. Your help would be very much appreciated!","AnswerCount":3,"Available Count":1,"Score":0.0665680765,"is_accepted":false,"ViewCount":62,"Q_Id":43429169,"Users Score":1,"Answer":"If you are trying to develop a Web-Application and use FaceBook login, register as a facebook developer (it is free) and then go through their instructions. It is completely self-explanatory and quite easy to follow. \nVisit : developers.facebook.com for clear way of how to do this.","Q_Score":2,"Tags":"python,django,facebook,user-registration","A_Id":43429232,"CreationDate":"2017-04-15T17:34:00.000","Title":"How can I add a facebook user login functionality","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Jupyer 4.3.0. I find that when I update my ~\/.jupyter\/custom\/custom.css, the changes are not reflected in my notebook until I kill jupyter-notebook and start it again. This is annoying, so how can I make Jupyter Notebook recognize the custom.css file changes without completely restarting the notebook?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":643,"Q_Id":43457337,"Users Score":4,"Answer":"I'm using Jupyter 5.0. \nRight now I've tried to edit custom.css and the changes are reflected immediately after reloading a page without restarting. \nI'm not sure about 4.3 version, but I guess it should work the same way. What did the property you change?","Q_Score":4,"Tags":"css,ipython-notebook,jupyter-notebook,jupyter","A_Id":43461264,"CreationDate":"2017-04-17T18:33:00.000","Title":"Jupyter reload custom.css?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Jupyer 4.3.0. I find that when I update my ~\/.jupyter\/custom\/custom.css, the changes are not reflected in my notebook until I kill jupyter-notebook and start it again. This is annoying, so how can I make Jupyter Notebook recognize the custom.css file changes without completely restarting the notebook?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":643,"Q_Id":43457337,"Users Score":0,"Answer":"The \/custom\/custom.css stopped working for me when I generated a config file, but if anyone stumbles to this problem too, the solution is to uncomment the line c.NotebookApp.extra_static_paths = [] in the jupyter_notebook_config.py file and add \".\/custom\/\" - or whatever path you chose for your custom css - inside the brackets.\nP.S.: OS is Linux Manjaro 5.12 and Jupyter Notebook version is 6.3.0.","Q_Score":4,"Tags":"css,ipython-notebook,jupyter-notebook,jupyter","A_Id":67893531,"CreationDate":"2017-04-17T18:33:00.000","Title":"Jupyter reload custom.css?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Flask app, served by Nginx and Gunicorn with 3 workers. My Flask app is a API microservice designed for doing NLP stuff and I am using the spaCy library for it. \nMy problem is that they are taking huge number of RAM as loading the spaCy pipeline spacy.load('en') is very memory-intensive and since I have 3 gunicorn workers, each will take about 400MB of RAM. \nMy question is, is there a way to load the pipeline once and share it across all my gunicorn workers?","AnswerCount":4,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":5127,"Q_Id":43467312,"Users Score":0,"Answer":"One workaround is, you can load the spaCy pipeline before-hand, pickle (or any comfortable way of serializing) the resultant object and store it in a DB or file system. Each worker can just fetch the serialized object, and simply deserialize it.","Q_Score":24,"Tags":"python,gunicorn,spacy","A_Id":65805224,"CreationDate":"2017-04-18T08:29:00.000","Title":"Sharing data across my gunicorn workers","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm interested in trying a web scraping project. The target sites use Javascript to dynamically load and update content. Most of the discussion online concerning web scraping such sites indicates node.js, casper.js, phantom.js, and nightmare.js are all reasonably popular tools to use when attempting such a project. Node.js seems to be used most often. \nIf I am running a Flask server and wish to display the results of a node.js, for example, scrape in tabular format on my site, is this possible? Will I run into compatibility issues? Or should I try to stick it out with a python-based approach to scraping like BS4 for the sake of consistency? I ask because node.js is described as a server, so I assume a conflict would arise if I tried to use it and Flask simultaneously.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":160,"Q_Id":43485072,"Users Score":1,"Answer":"If you want to write a web scraper that executes javascript, node.js (with something like Phantom.js) is a great choice. Another popular choice is Selenium. You would need to simulate user actions to activate event handlers. Let's call this action \"scraping\". BS4 would not be appropriate because it cannot execute javascript.\nOnce you have your data saved to disk, displaying the results in HTML tabular form (let's call this action \"reporting\") would require yet another solution. Flask is a suitable choice.\nSince the scraping and reporting are separate concerns, no conflict would arise if you wanted to use the two services simultaneously. When using Selenium or node.js as a scraper, you aren't really running a web server. So it's incorrect to think of it as two web-servers in possible conflict.","Q_Score":0,"Tags":"javascript,node.js,python-3.x,web-scraping","A_Id":43485536,"CreationDate":"2017-04-19T02:05:00.000","Title":"Does running a Flask web server preclude web scraping in Node.JS?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"i have a django chatbot application on web faction shard host. the idea is : the chatbot application simulate the customer service in chatting with the customers.\nBasically the conversation will be exchanged through the API using GET and POST, where it first POST the input then GET calls the python file to SELECT the input form the DB and process it then update the database with the retrieved out put.Finally a GET is used to fetch the out put and display it.\nso far it is working for one user at a time, what i am considering now is that i want it to chat with multiple customer at the same time an isolating each user. \nDo i have to use Redis just for the chatting part, if yes how i can merge it in my project? other there are other solution out there?\ni have developed it using:\npython3: for the chatbot code.\nDjango: for the website.\nMysql: for the data base, that hold the knowledge based for the chatbot such as a table that include number of input and it correspond output.\nThank you,","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":2101,"Q_Id":43503589,"Users Score":1,"Answer":"You can use Redis,Celery,Python RQ,Rabbit MQ  as a queue for distributed tasks(chatting tasks) in your Django app. But this will increase complexity in your project. I will recommend you to Develop Python based multi client chat server.","Q_Score":0,"Tags":"python,mysql,django","A_Id":43504942,"CreationDate":"2017-04-19T18:35:00.000","Title":"making a Django chatbot application interact with multiple users","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Appium-Python with AWS Device farm. And I noticed that AWS run my tests in a random order.\nSince my tests are part dependent I need to find a way to tell AWS to run my tests in a specific order.\nAny ideas about how can I accomplish that?\nThanks","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":251,"Q_Id":43520574,"Users Score":0,"Answer":"I work for the AWS Device Farm team. \nThis seems like an old thread but I will answer so that it is helpful to everyone in future. \nDevice Farm parses the test in a random order. In case of Appium Python it will be the order what is received from pytest --collect-only. \nThis order may change across executions. \nThe only way to guarantee an order right now is to wrap all the test calls in a new test which will be the only test called. Although not the prettiest solution this is the only way to achieve this today.\nWe are working on bringing more parity between your local environment and Device Farm in the coming weeks.","Q_Score":1,"Tags":"pytest,python-appium,aws-device-farm","A_Id":44378193,"CreationDate":"2017-04-20T13:12:00.000","Title":"AWS Device Farm- Appium Python - Order of tests","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"working on a website built with python and angular but after every single change I need to hard reset browser to see it. I see this is a problem in general so what's the best approach for caching js and css resources ? right now I dont care if each file will be called on every single page if there is no other option.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":129,"Q_Id":43523750,"Users Score":1,"Answer":"Are you referring to development time? If so, this can often be set in the browser. Which browser are you using? For Chrome: \n\nOpen the developer tools.\nSelect the network tab.\nCheck the Disable cache checkbox","Q_Score":0,"Tags":"python,angularjs,angular,caching,browser-cache","A_Id":43525479,"CreationDate":"2017-04-20T15:23:00.000","Title":"angular\/python - browser caching issue on each change","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have the following directory structure for my Sphinx project.\n\nroot\n\n\nbuild\nsource\n\n\nindex.md\nsnippets\n\n\n\nI want to copy root\/source\/snippets to build\/html\/snippets as is; this directory has code snippet files.\nI don't think .. include::, :download: and html_extra_path are what I need. Is there a way to do this using the build configuration? Or is the only way to modify the make build scripts.\nI am using Python v2.7.13 and Sphinx v1.5.1.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":596,"Q_Id":43526551,"Users Score":1,"Answer":"I just came across this question, and can answer for Sphinx 3.3 with Python 3.8.\nAll I had to do was put html_extra_path = ['extra'] into conf.py. Then I made docs\/extra\/snippets. Now snippets and all of its content are copied into _build\/html\/snippets.","Q_Score":1,"Tags":"python-sphinx","A_Id":64704941,"CreationDate":"2017-04-20T17:52:00.000","Title":"How do I include a subdirectory and its content to the Sphinx output\/build directory?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Basically I'm using python to send serial data to an arduino so that I can make moving dials using data from the game. This would work because you can use the url \"localhost:8111\" to give you a list of these stats when ingame. The problem is I'm using urllib and BeautifulSoup but they seem to be blindly reading the source code not giving the data I need.\nThe data I need comes up when I inspect the element of that page. Other pages seem to suggest that using something to run the HTML in python would fix this but I have found no way of doing this. Any help here would be great thanks.","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":853,"Q_Id":43552146,"Users Score":0,"Answer":"Your problem might be that the page elements are Dynamic. (Revealed by JavaScript for example)\nWhy is this a problem? A: You can't access those tags or data. You'll have to use either a headless\/Automated browser ( Learn more about selenium ).\nThen make a session through selenium and keep feeding the data the way you wanted to the Arduino.\nSummary: If you inspect elements you can see the tag, if you go to view source you cant see it. This can't be solved using bs4 or requests alone. You'll have to use a module called Selenium or something similar.","Q_Score":2,"Tags":"python,html,beautifulsoup,urllib","A_Id":43559174,"CreationDate":"2017-04-21T21:15:00.000","Title":"Trying to read data from War Thunder local host with python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Python 2.7 and flask framework with flask-sqlalchemy module.\nI always get the following exception when trying to insert : Exception Type: OperationalError. Exception Value: (1366, \"Incorrect string value: \\xF09...\nI already set MySQL database, table and corresponding column to utf8mb4_general_ci and I can insert emoji string using terminal.\nFlask's app config already contains app.config['MYSQL_DATABASE_CHARSET'] = 'utf8mb4', however it doesn't help at all and I still get the exception.\nAny help is appreciated","AnswerCount":4,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1485,"Q_Id":43557926,"Users Score":0,"Answer":"Add config file main file and set set 'charset' => 'utf8mb4'\nyou have to edit field in which you want to store emoji and set collation as utf8mb4_unicode_ci","Q_Score":4,"Tags":"python,mysql,flask","A_Id":43557984,"CreationDate":"2017-04-22T10:08:00.000","Title":"Flask SQLAlchemy can't insert emoji to MySQL","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Essentially, my questions are as stated above in the title. What I'm really seeking to know is why it would be privy of me to build a web-page utilizing the Django framework as opposed to solely building it out with HTML5 and CSS3. \nI do know that Django utilizes bootstrapping of HTML5 and CSS and this is where my questions are raised over the efficiency of using the Django framework as opposed to solely using HTML5\/CSS3.\n1.) What are the advantages of Django?\n2.) What does utilizing the Django framework offer me that HTML5\/CSS3 do not? \n3.) HTML5 can also build dynamic web-pages as can Django. Why would Django be better for a dynamic web-page?\nI am looking for a very valid answer here as I am about to start building my web-page. The responses I get to these questions will be the nail in the coffin for which method I will be using to build the web-page. Thanks ladies and gentleman and I hope you find this question to be worth your while in answering.","AnswerCount":4,"Available Count":4,"Score":0.0996679946,"is_accepted":false,"ViewCount":1470,"Q_Id":43565014,"Users Score":2,"Answer":"Django is a server side framework. So it has little to do with HTML.\nDjango will give you easier\/standardized ways to handle HTTP requests, and to manipulate entries in the database, among other things.\nHTML5 alone doesn't enable dynamic web-pages. You can have interactive web pages, but they will always be the same, for every user, whenever you access it.","Q_Score":0,"Tags":"python,html,django,dynamic","A_Id":43565086,"CreationDate":"2017-04-22T21:49:00.000","Title":"What Are The Advantages of Building a Web-Page with Django as Opposed to Solely Using HTML5\/CSS3?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Essentially, my questions are as stated above in the title. What I'm really seeking to know is why it would be privy of me to build a web-page utilizing the Django framework as opposed to solely building it out with HTML5 and CSS3. \nI do know that Django utilizes bootstrapping of HTML5 and CSS and this is where my questions are raised over the efficiency of using the Django framework as opposed to solely using HTML5\/CSS3.\n1.) What are the advantages of Django?\n2.) What does utilizing the Django framework offer me that HTML5\/CSS3 do not? \n3.) HTML5 can also build dynamic web-pages as can Django. Why would Django be better for a dynamic web-page?\nI am looking for a very valid answer here as I am about to start building my web-page. The responses I get to these questions will be the nail in the coffin for which method I will be using to build the web-page. Thanks ladies and gentleman and I hope you find this question to be worth your while in answering.","AnswerCount":4,"Available Count":4,"Score":0.049958375,"is_accepted":false,"ViewCount":1470,"Q_Id":43565014,"Users Score":1,"Answer":"Django is a python web application framework that allows you to send requests from your page to a server that will in turn provide a response back to your web page.  \n\nAdvantages: The power of Django is the ability to quickly get both the client ( your page ) and the backend ( the server-side logic ) setup.  The backend can include writing to a database, processing information, retrieving information which is subsequently a response delivered to your web page. \nHTML5\/CSS3 is markup languages for your web page.  You can use a editors like sublime or even notepad ++ if you are building a static web page. Django, like most web app frameworks, are used because of what I've described in #1 ( and many other unlisted reasons ).\nHTML5 provides the ability to make dynamic web pages ( using a client side library like JQuery as an embedded script ), Django helps you build web apps.  You can write a web page using only HTML5 and JQuery to display list of tv shows that are currently on ABC by listing what is currently playing today, but what about for tomorrow?  You need server-side help by creating response that will fetch all shows for tomorrow by calling the ABC API.  Take a look at server-side logic and web applications. \n\nIn short, there are web pages and web applications.  Sounds like to me you are building the former, so Django might be overkill.","Q_Score":0,"Tags":"python,html,django,dynamic","A_Id":43565218,"CreationDate":"2017-04-22T21:49:00.000","Title":"What Are The Advantages of Building a Web-Page with Django as Opposed to Solely Using HTML5\/CSS3?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Essentially, my questions are as stated above in the title. What I'm really seeking to know is why it would be privy of me to build a web-page utilizing the Django framework as opposed to solely building it out with HTML5 and CSS3. \nI do know that Django utilizes bootstrapping of HTML5 and CSS and this is where my questions are raised over the efficiency of using the Django framework as opposed to solely using HTML5\/CSS3.\n1.) What are the advantages of Django?\n2.) What does utilizing the Django framework offer me that HTML5\/CSS3 do not? \n3.) HTML5 can also build dynamic web-pages as can Django. Why would Django be better for a dynamic web-page?\nI am looking for a very valid answer here as I am about to start building my web-page. The responses I get to these questions will be the nail in the coffin for which method I will be using to build the web-page. Thanks ladies and gentleman and I hope you find this question to be worth your while in answering.","AnswerCount":4,"Available Count":4,"Score":0.049958375,"is_accepted":false,"ViewCount":1470,"Q_Id":43565014,"Users Score":1,"Answer":"1.) What are the advantages of Django?\nServer-side scripting without the necessity to use PHP. If you already worked with Python, you don't need to learn another language for you server-side.\n2.) What does utilizing the Django framework offer me that HTML5\/CSS3 do not?\nHm, deployment to a server, handling user requests and dynamically generated webpages. You mentioned making an intricate website in a comment. I don't know what you mean by that, but a framework will let you do this way faster then without. Especially, if you only rely on client-side JS with static HTML5 and CSS3, I'm fairly certain you will have a hard time achieving your goal.\n3.) HTML5 can also build dynamic web-pages as can Django. Why would Django be better for a dynamic web-page?\nI'm not really sure you understand what dynamic means. Dynamic means generated from code, as opposed to static, which means served directly from an .html file. Django let's you do both, it's a framework and offers lots of flexibility.","Q_Score":0,"Tags":"python,html,django,dynamic","A_Id":43565333,"CreationDate":"2017-04-22T21:49:00.000","Title":"What Are The Advantages of Building a Web-Page with Django as Opposed to Solely Using HTML5\/CSS3?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Essentially, my questions are as stated above in the title. What I'm really seeking to know is why it would be privy of me to build a web-page utilizing the Django framework as opposed to solely building it out with HTML5 and CSS3. \nI do know that Django utilizes bootstrapping of HTML5 and CSS and this is where my questions are raised over the efficiency of using the Django framework as opposed to solely using HTML5\/CSS3.\n1.) What are the advantages of Django?\n2.) What does utilizing the Django framework offer me that HTML5\/CSS3 do not? \n3.) HTML5 can also build dynamic web-pages as can Django. Why would Django be better for a dynamic web-page?\nI am looking for a very valid answer here as I am about to start building my web-page. The responses I get to these questions will be the nail in the coffin for which method I will be using to build the web-page. Thanks ladies and gentleman and I hope you find this question to be worth your while in answering.","AnswerCount":4,"Available Count":4,"Score":0.0,"is_accepted":false,"ViewCount":1470,"Q_Id":43565014,"Users Score":0,"Answer":"If you want to serve same dish for all visitors to your site, HTML is fine. But if you want to server different dish to different user then you'll need ingredients and a way to churn them. Ingredients can be users, their profile and preferences, location, and other entities users are dealing with. Django is one way to churn all of these together and present (in HTML for example) to users.","Q_Score":0,"Tags":"python,html,django,dynamic","A_Id":43584653,"CreationDate":"2017-04-22T21:49:00.000","Title":"What Are The Advantages of Building a Web-Page with Django as Opposed to Solely Using HTML5\/CSS3?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am facing a strange problem. I added latest sphinx_rtd_theme files on to my project and did the required theme overrides (including the well-known text wrapping within the tables).\nThe local build works absolutely fine. But it was pushed to the master, the theme goes back to very basic and it is not getting applied. I tried manual builds but still I could not trace the root cause and the workaround.\nBy master, I mean the builds that are created on the ReadTheDocs website (account).","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1500,"Q_Id":43571768,"Users Score":0,"Answer":"ReadTheDocs doesn't purge the build directory on every new build. I fixed it by manually cleaning all temporary files from ReadTheDocs:\n\nall build directories\ncreated content from autoapi plugins\n\nAfter that, my modified RTD theme was used for new builds.\nTo do so I added a tag detection in conf.py. If my tag is set, it does a cleanup. You can set user defined tags in the ReadTheDocs web UI.","Q_Score":1,"Tags":"themes,python-sphinx,read-the-docs","A_Id":43587070,"CreationDate":"2017-04-23T13:26:00.000","Title":"sphinx_rtd_theme is not getting applied on the ReadTheDocs builds but local builds work fine","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on Guardian mobile robot. It has 2 ROS packages, one for real robot and other for Gazebo simulation. Mapping and navigation code is available in real robot package and not in Gazebo simulation package. Please tell, how can I run mapping and navigation code in Gazebo package. Thanks","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1003,"Q_Id":43582979,"Users Score":0,"Answer":"gazebo has a node you can start and use it to exchange data:\ngazebo_ros_api_plugin\n\nThe gazebo_ros_api_plugin plugin, located with the gazebo_ros package,\n  initializes a ROS node called \"gazebo\". It integrates the ROS callback\n  scheduler (message passing) with Gazebo's internal scheduler to\n  provide the ROS interfaces described below. This ROS API enables a\n  user to manipulate the properties of the simulation environment over\n  ROS, as well as spawn and introspect on the state of models in the\n  environment.\nThis plugin is only loaded with gzserver.","Q_Score":1,"Tags":"python,ros","A_Id":43583439,"CreationDate":"2017-04-24T08:14:00.000","Title":"How to run actual robot code in Gazebo Simulation?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm wondering if there's an easy way (using python\/js\/html) to automatically select the form to insert credentials.\nBasically at the login-page you don't have to click the 'username' form and can type right away.\nThanks!","AnswerCount":2,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":63,"Q_Id":43606341,"Users Score":4,"Answer":"simply use 'autofocus' in input html <input type=\"text\" name=\"fname\" autofocus>","Q_Score":2,"Tags":"javascript,python","A_Id":43606517,"CreationDate":"2017-04-25T09:12:00.000","Title":"Type your info without having to click the form","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using g2.2 xlarge instance of amazon.\nI'm having this function that takes 3 minutes to run on my laptop which is so slow.\n         However, when running it on EC2 it takes the same time , sometimes even more.\nSeeing the statistics , I noticed EC2 uses at its best 25% of CPU.\nI paralleled my code, It's better but I get the same execution time between my laptop and EC2.\nfor my function:\nI have an image as input,I run my function 2 times(image with and without image processing) that I managed to run them in parallel.  I then extract 8 text fields from that image using 2 machine learning algorithms(faster-rcnn(field detection)+clstm(text reading) and then the text is displayed on my computer.\nAny idea how to improve performance (processing time) in EC2?","AnswerCount":1,"Available Count":1,"Score":0.6640367703,"is_accepted":false,"ViewCount":1356,"Q_Id":43607466,"Users Score":4,"Answer":"I think you need to profile your code locally and ensure it really is CPU bound. Could it be that time is spent on the network or accessing disk (e.g. reading the image to start with). \nIf it is CPU bound then explore how to exploit all the cores available (and 25% sounds suspicious - is it maxing out one core?). Python can be hard to parallelise due to the (in)famous GIL. However, only worry about this when you can prove it's a problem, profile first!","Q_Score":1,"Tags":"python,python-2.7,amazon-web-services,amazon-ec2","A_Id":43607778,"CreationDate":"2017-04-25T09:58:00.000","Title":"Why amazon EC2 is as slow as my machine when running python code?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a WebSocketServer with Flask and gevent. I have my own WebsocketApplication inheriting from WebSocketApplication in which I overrite on_open(), on_close(), on_message() and it's working fine. I also have a Method broadcast_message() to send a message to all clients, which is working fine as well.  Now I need to call broadcast_message() from outside my WebSocketApplication (e.g. when a special site is visited), but I didn't find any way to do this.  I am using Python 3.5.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":108,"Q_Id":43614750,"Users Score":0,"Answer":"You can call the ws = environ[\"wsgi.websocket\"] to pull up the websocket interface anywhere in your application.","Q_Score":0,"Tags":"python,flask,websocket,python-3.5,gevent","A_Id":46964623,"CreationDate":"2017-04-25T15:18:00.000","Title":"Websocketserver with Flask and gevent in Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I use cqlengine with django. In some occasions Cassandra throws an error indicating that user has no permissions do to something. Sometimes this is select, sometimes this is update or sometimes it is something else. I have no code to share, because there is no specific line that does this. I am very sure that user has all the permissions, and sometimes it works. So if user did not have the permissions it should always throw no permission error. \nSo what might be the reasons behind this and how to find the problem?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":292,"Q_Id":43622277,"Users Score":0,"Answer":"Is the system_auth keyspace RF the same as the amount of nodes? Did you try to run a repair on the system_auth keyspace already? If not do so.\nFor me it sounds like a consistency issue.","Q_Score":0,"Tags":"python,django,cassandra,permissions,cqlengine","A_Id":43630653,"CreationDate":"2017-04-25T22:54:00.000","Title":"Cassandra: occasional permission errors","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I use cqlengine with django. In some occasions Cassandra throws an error indicating that user has no permissions do to something. Sometimes this is select, sometimes this is update or sometimes it is something else. I have no code to share, because there is no specific line that does this. I am very sure that user has all the permissions, and sometimes it works. So if user did not have the permissions it should always throw no permission error. \nSo what might be the reasons behind this and how to find the problem?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":292,"Q_Id":43622277,"Users Score":0,"Answer":"If you have authentication enabled, make sure you set appropriate RF for keyspace system_auth (should be equal to number of nodes).\nSecondly, make sure the user you have created has following permissions on all keyspaces. {'ALTER', 'CREATE', 'DROP', 'MODIFY', 'SELECT'}. If you have the user as a superuser make sure you add 'AUTHORIZE' as a permission along with the ones listed above for that user.  \nThirdly, you can set off a read-repair job for all the data in system_auth keyspace by running CONSISTENCY ALL;\nSELECT * from system_auth.users ;\nSELECT * from system_auth.permissions ;\nSELECT * from system_auth.credentials ;\nHope this will resolve the issue !","Q_Score":0,"Tags":"python,django,cassandra,permissions,cqlengine","A_Id":43645204,"CreationDate":"2017-04-25T22:54:00.000","Title":"Cassandra: occasional permission errors","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"It's my first website on Azure with Python. I developed before with .NET. Sorry if my question is a basic one.\nI deployed my Django website on Azure. It works fine with the DB settings in the settings.py.\nNext step, I thought, is to transfer the DB settings to Azure's Application Settings - Connection Strings, what I did. \nI am aware that I need the prefix MYSQLCONNSTR_connectionString1. \nHow can I now link my Django\/Python WebApp with the Connection String in the Azure Application Settings? \nI would be very grateful for help.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":987,"Q_Id":43630573,"Users Score":0,"Answer":"Just use import os to import os package in your Django code like settings.py, then get these environment variables which be defined in App settings or Connection strings of the tab Application settings on Azure portal via the code os.getenv(\"<environ-var-name>\").\nFor the environment variable defined in App settings, you just pass the variable name defined like VARNAME as the argument for os.getenv().\nTo get the value of the environment variable defined in Connection strings, you need to add the different prefix or surfix for the variable name like VARNAME, as below.\n\nFor SQL Database, using prefix SQLAZURECONNSTR with infix symbol _ for VARNAME is SQLAZURECONNSTR_VARNAME.\nFor SQL Server, using prefix SQLCONNSTR with infix symbol _ for VARNAME is SQLCONNSTR_VARNAME.\nFor MySQL, using prefix MYSQLCONNSTR with infix symbol _ for VARNAME is MYSQLCONNSTR_VARNAME.\nFor Custom, using surfix MYSQLCONNSTR with infix symbol _ for VARNAME is VARNAME_CONNECTSTRING.\n\nHope it helps.","Q_Score":0,"Tags":"python,django,azure,environment-variables","A_Id":43651050,"CreationDate":"2017-04-26T09:45:00.000","Title":"Link Azure Connection String with Django WebApp?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I exported my documents from Alfresco 4.x and now i need to import them to Alfreco 5.1, however i had different content models. So only think i need is to rewrite types and base url, i have similar types in my new Alfresco, but not the same name and prefix, url. So my question is:\nHow to rewrite metadata which is stored in ACP file in python or maybe java?\nI tried to use zipFile in python, but it gives me only errors and keep convincing me that i dont have zip file. I can't open it in notepad++ because it is not readable. I tried to just read content of file but python give blank line when i try to print it.\nEDIT:\nHere is a link to my file that i need to open and edit.\nDELETED no need for this anymore.","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":115,"Q_Id":43638497,"Users Score":2,"Answer":"If it is a single archive your best bet is to unpack the acp (just a normal zip file, so any zip tool will work) and manipulate the .XML file inside it, which contains all the metadata, types, associations... \nYou could then use an XSLT to change the XML file and types and properties inside and rezip it with the rest of the content package.\nAnother approach can be to add the missing properties and aspects in a new 'legacy'-content model and add it to Alfresco 5.1. Once it is imported you can write a script to transfer the properties to the new model.\nOnce you are sure everything is copied you can remove the old model.","Q_Score":0,"Tags":"java,python,import,export,alfresco","A_Id":43650006,"CreationDate":"2017-04-26T15:28:00.000","Title":"Edit content of acp in python\/java","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I exported my documents from Alfresco 4.x and now i need to import them to Alfreco 5.1, however i had different content models. So only think i need is to rewrite types and base url, i have similar types in my new Alfresco, but not the same name and prefix, url. So my question is:\nHow to rewrite metadata which is stored in ACP file in python or maybe java?\nI tried to use zipFile in python, but it gives me only errors and keep convincing me that i dont have zip file. I can't open it in notepad++ because it is not readable. I tried to just read content of file but python give blank line when i try to print it.\nEDIT:\nHere is a link to my file that i need to open and edit.\nDELETED no need for this anymore.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":115,"Q_Id":43638497,"Users Score":0,"Answer":"I'm sorry i see today that i did bad export it had 0 kb so python was right it is empty i don't know how it happened. Thank you all, now i can work with as a zipFile and i will edit xml with metadatas im happy now :)","Q_Score":0,"Tags":"java,python,import,export,alfresco","A_Id":43651233,"CreationDate":"2017-04-26T15:28:00.000","Title":"Edit content of acp in python\/java","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In Odoo 8, I added an ir.rule to a model that restricts write access for certain users. I would\u00a0like to personalize the error message restricted user get after clicking 'Save'. I can't just modify the translation with _() because the new message must be specific to that model.\nIs there a way to do this easily in Odoo 8 without having to modify the source code of Odoo itself ?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":197,"Q_Id":43639539,"Users Score":0,"Answer":"I assume the Save button invokes the model's write method. In that case, you can override this method to raise custom error message when the corresponding conditions are met. You have the uid of the user that called the write method, so it must be enough to achieve the desired effect.","Q_Score":0,"Tags":"python,openerp,odoo-8","A_Id":43661888,"CreationDate":"2017-04-26T16:14:00.000","Title":"Odoo 8 : Personalized error message after trying to modify a read-only object","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am deploying a Django App using Elastic Beanstalk on AWS. The app has a function whereby user can register their details.\nThe problem is when I make small changes to my app and deploy this new version I loose the registered users since their information isn't in my local database (only the database on aws).\nIs there any way to download the modifications to the database during production so that I can keep these changes when I redeploy. \nI'm not using AWS RDS, I simply bundle the .SQLite file with my source code and deploy to Elastic Beanstalk.\nThanks in Advance.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":137,"Q_Id":43650204,"Users Score":0,"Answer":"Don't bundle the development .sqlite file with the production stuff. It needs to have its own .sqlite file and you just need to run migrations on the production one.","Q_Score":0,"Tags":"python,django,sqlite,amazon-web-services,amazon-elastic-beanstalk","A_Id":43666611,"CreationDate":"2017-04-27T06:31:00.000","Title":"Update sqlite database based on changes in production","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Django documentation version 1.11 states:\n\nYour apps can live anywhere on your Python path. In this tutorial, we\u2019ll create our poll app right next to your manage.py file so that it can be imported as its own top-level module, rather than a submodule of mysite.\n\nDoes this means that this is the recommended location for apps? Why is it that this is being recommended in the first place? What is the advantage of having the apps available to be imported as its own top-level module rather than a submodule of mysite?","AnswerCount":1,"Available Count":1,"Score":0.537049567,"is_accepted":false,"ViewCount":533,"Q_Id":43660860,"Users Score":3,"Answer":"There are basically two kind of apps: your own project-specific apps, and generic reusable ones. Examples of reusable apps are the Django contrib's \"admin\" and \"auth\" apps. But there are hundreds of third-part reusable apps on the net, ranging from a couple helper functions to full-blown CMS or e-shop solutions.\nThe project's root is of course the obvious place for your own project-specific apps. Third-parts are usually installed as python packages (Django apps are python packages) in your virtualenv.","Q_Score":4,"Tags":"python,django","A_Id":43661039,"CreationDate":"2017-04-27T14:36:00.000","Title":"Where to put apps in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've been looking into flask lately and when looking at the tutorial information on the flask website, they have you install the demo webapp as a python package. \n I've seen this in some other demo flask webapps as well, but I haven't seen a reason why you would do this.  The dev server renders the app without this and I would assume that a production server would once it is set up correctly.\nThis is probably an issue of simply not having the right mindset, but I just can't find a reason why I want to do this.  Is it for easy replication or something else altogether?","AnswerCount":3,"Available Count":1,"Score":0.1325487884,"is_accepted":false,"ViewCount":1356,"Q_Id":43662475,"Users Score":2,"Answer":"What would be involved in setting up your production server to deploy everything it needs without packaging it up?\n\nThe right Python version\nThe right Python packages\nEnough memory\nSecurity to ensure that no one that has access to that box can suddenly commit changes to your repo\n\nIf you did package your webapp, you can mitigate or eliminate most of these issues.\n\nThe version you require would be specified by your webapp, and you'd be compelled to install it anyway.\nThe packages you require could be pulled down through the use of a package manager, thus eliminating any manual installation of these.\nIf you don't hook this package to a code repository at all, then there's no fear of intrusion from the outside.\n\nAdditionally, a package is a lot more consumer-friendly.  Sure, we as developers work just fine with setting up code and environments, but if you want to show something off real fast, the last thing you want to do is force someone to have to download all of the dependencies and prerequisites before they can run your app.","Q_Score":3,"Tags":"python,flask","A_Id":43662608,"CreationDate":"2017-04-27T15:51:00.000","Title":"Why install flask webapp as a package?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is there any such library available which allow to run python code or any executable binary on the client machine using JavaScript. I have a strange scenario. All client machine use a web application hosted on a server, but authentication should be done using a device in the client machine using ttyUSB0 interface. Since it is not possible for a web application to access client machine, is it possible to create a client application using library like Pywebview which will allow to call that library directly from the web application using Javascript.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":66,"Q_Id":43672788,"Users Score":0,"Answer":"Can you not call a specific page of your web application (assuming your web application uses some web framework developed in python) via ajax with javascript and does this page execute a Python function (under the table)?","Q_Score":0,"Tags":"javascript,python","A_Id":43673110,"CreationDate":"2017-04-28T05:43:00.000","Title":"Call Python function from javascript inside client application","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm currently building a scrapy project that can crawl any website from the first depth to the last. I don't extract many data, but I store the all page HTML (response.body) in a database.\nI am currently using Elasticsearch with the bulk API, to store my raw HTML.\nI had a look in Cassandra but I did not find an equivalent of the Elasticsearch bulk and it affects the performances of my spider.\nI am interested in performance, and was wondering if Elasticsearch was a good choice, and if maybe there was a more appropriate NoSQL database.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":796,"Q_Id":43677809,"Users Score":2,"Answer":"That very much depends on what you are planning to do with the scraped data later on. \nElasticsearch does some complex indexing operations upon insertion which will make subsequent searches in the database quite fast ... but this also costs processing time and introduces a latency.\nSo to answer your question whether Elasticsearch was a good choice: \nIf you plan to build some kind of search engine later on, Elasticsearch was a good choice (as the name indicates). But you should have a close look at the configuration of Elasticsearch's indexing options etc to make sure it works the way you need it.\nIf on the other hand you just want to store the data and do processing tasks on it later, Elasticsearch was a poor choice and you would be better off with Cassandra or another NoSQL database. \nWhich NoSQL database suits your needs best, depends - again - on the actual usage scenario.","Q_Score":3,"Tags":"python,database,elasticsearch,scrapy,nosql","A_Id":43679611,"CreationDate":"2017-04-28T10:17:00.000","Title":"Scrapy - Database choice","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I recently started playing with Django.\nWhen I try to log in into the admin panel, it succeeds in Firefox but doesn't in Google Chrome.\nThis is the error i get : \nForbidden (CSRF cookie not set.): \/admin\/login\/\nMy cookies are enabled in Chrome for every website. Is there a specific reason why it would work in Firefox but not in Chrome?\nThanks!","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":258,"Q_Id":43680502,"Users Score":0,"Answer":"I reset my chrome setting and it worked fine.\nIn Chrome, click on the 3 dots on the far right and goto settings.\nOn settings page, scroll all the way down or click on the bottom left \"Reset Settings\" button and reset settings.","Q_Score":1,"Tags":"python,django,google-chrome","A_Id":63429211,"CreationDate":"2017-04-28T12:40:00.000","Title":"Django let me log in in Firefox but not in chrome","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am currently using boto3 to sign users up inside a UserPool with cognito.  I'd like to allow a policy for these users to be able to synthesize speech in Amazon Polly.  However, I am not sure how to set a limit to the number of times they can call this?\nI would like to be able to sell a tier service, i.e. tier 1 can read x amount of strings so it is important I be able to limit polly requests per user.  Thank you.","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":1412,"Q_Id":43690635,"Users Score":2,"Answer":"This is not possible.\nThe permission model in AWS controls whether or not a set of credentials is permitted to make a particular API call. The credentials can be time-limited and API calls can be restricted by things like IP address, but it is not possible to limits API calls by quantity.\nThis need is usually addressed by having users (\"clients\") call an API (eg in AWS API Gateway) which will trigger your own code on either AWS Lambda or an application. The Lambda function or app then verifies whether to allow the action and then makes the API call on behalf of the client.\nThis method has other advantages, such as adding functionality to the call, tracking per-user usage for billing purposes and further restricting functionality.","Q_Score":0,"Tags":"python,amazon-web-services,authentication,resources,limit","A_Id":43692199,"CreationDate":"2017-04-29T00:35:00.000","Title":"How to set quota or limit to aws cognito user?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to pass username in my URL.\nusername can be any combination of letter, numbers and special characters like @,_.\nalso, username starts with a letter.\nusername examples: test@1, test_1,test2_1990,","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1512,"Q_Id":43697351,"Users Score":2,"Answer":"You can use this regex for your purpose: \"^[a-zA-Z][a-zA-Z0-9_@]*$\"","Q_Score":1,"Tags":"python,regex,django,django-urls","A_Id":43697484,"CreationDate":"2017-04-29T15:22:00.000","Title":"Regex to match combination of letter and numbers to be used in URL pattarns in Django Project?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am recently using Django to program my web interface for my \"scientific computing engine\".\nI wrap the \"computing engine\" as a python module and call it inside the Django Framework. \nThe compute() function of the \"engine\" takes several minutes to run (I use ajax to trigger it) , at the same time, I let the front-end make extra ajax call every 0.5 second to update the CPU and Memory status to the front-end. But I find the server is not respond to the extra ajax call until the compute() finishes.\nAfter search around, I think I might use the idea of asynchronous or multithreading\nso I make the function in views.py like below.\ndef submit(request):\n     #some prepare\n     ........\n     # call the engine\n     t = Thread(target = compute)\n     t.start()\n     return HttpResponse(\"started\")\n\nBut the system still not response to my extra ajax call until the compute() finish (The \"engine\" only use around 20% of the CPU, so there is plenty of computing power left). \nI am a newbie in back-end programming, I am not sure about how Django or backend server handle request internally. \nThank you so much if anyone can give me some hint about how to handle this situation.","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":94,"Q_Id":43706048,"Users Score":1,"Answer":"I finally solved this problem by using python subprocess\nI make my \"compute\" code in a separate file and use the Popen to call it. \n\nfrom subprocess import Popen\ndef submit(request):\n     #some prepare\n     ........\n     # call the engine\n     p = Popen([\"python\", \"compute.py\", <arguments>])\n     return HttpResponse(\"started\")\n\nHowever as suggested, subprocess is not a very good and safe practice. This solution is easy to realize but I will try to convert the back-end to worker mode by using Celery or  django-channels as @Grimmy suggested.","Q_Score":1,"Tags":"python,ajax,django,asynchronous,backend","A_Id":43707120,"CreationDate":"2017-04-30T11:50:00.000","Title":"Django not response to Ajax call while doing a computing intensive task","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am recently using Django to program my web interface for my \"scientific computing engine\".\nI wrap the \"computing engine\" as a python module and call it inside the Django Framework. \nThe compute() function of the \"engine\" takes several minutes to run (I use ajax to trigger it) , at the same time, I let the front-end make extra ajax call every 0.5 second to update the CPU and Memory status to the front-end. But I find the server is not respond to the extra ajax call until the compute() finishes.\nAfter search around, I think I might use the idea of asynchronous or multithreading\nso I make the function in views.py like below.\ndef submit(request):\n     #some prepare\n     ........\n     # call the engine\n     t = Thread(target = compute)\n     t.start()\n     return HttpResponse(\"started\")\n\nBut the system still not response to my extra ajax call until the compute() finish (The \"engine\" only use around 20% of the CPU, so there is plenty of computing power left). \nI am a newbie in back-end programming, I am not sure about how Django or backend server handle request internally. \nThank you so much if anyone can give me some hint about how to handle this situation.","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":94,"Q_Id":43706048,"Users Score":1,"Answer":"It's never a good idea to start threads from views like that. \nThe most common way to solve this is to delegate the work to a separate worker\/process. In addition to django you have another python process looking for work.\nYou can keep it simple and make the Django view store information about the work that needs to be done in some format on disk or in a database (this would be the work queue). Then the worker process will run in a loop checking for available work every N seconds. Increase the number of workers\/processes to add more computing power (limited by your hardware of course)\nThe http request that creates the work request can return a job_id the user can query to get the status of the job. Is the job pending\/in progress\/done? Then maybe the user can also fetch the result of the job or even metadata such as duration and logs?\nThere are also frameworks out there to solve problems like this such as Celery and django-channels. Celery is probably easier to start with, but it might be overkill for what you are trying to do.\nThe advantage of using workers like this is that you can have a very light weight REST api in the front and you can scale up the number of workers, possibly across multiple servers as the demand increases.","Q_Score":1,"Tags":"python,ajax,django,asynchronous,backend","A_Id":43706191,"CreationDate":"2017-04-30T11:50:00.000","Title":"Django not response to Ajax call while doing a computing intensive task","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In the User Interface Revit has a \"select element by ID\" which has a \"Show\" button.  I'm able using RPS and a custom pyrevit code to select the elements, however I'd like to give my users the ability to scan through all the views and open views where the element is visible similar to the \"Show\" button.  Before going through, iterating views and elements in views, I thought I'd ask if there's a direct command open in the API. Or a way to call the show ribbon command.\nThanks in advance","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1445,"Q_Id":43720595,"Users Score":1,"Answer":"UIDocument.ShowElements( ICollection ids);","Q_Score":1,"Tags":"revit-api,revit,revitpythonshell,pyrevit","A_Id":43727921,"CreationDate":"2017-05-01T14:17:00.000","Title":"Run the \"Show\" Feature of \"Select Elements by ID\" using API Revit","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to use SASS in my Django Project. But where should I put all my Sass files ? Should I create a 'Sass' folder in my Project Folder or is it better to create for each App a 'Sass' folder. \nAnd which converter would you recommend to convert my sass files to css ?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":553,"Q_Id":43722940,"Users Score":1,"Answer":"In my opinion, sass files are frontend's stuffs so i will put it in static.","Q_Score":2,"Tags":"python,css,django,web,sass","A_Id":43750155,"CreationDate":"2017-05-01T16:52:00.000","Title":"Adding Sass to Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it possible to get lifetime data from using facebookads api on python? I tried to use date_preset:lifetime and time_increment:1, but got a server error instead. And, then I found this on their website:\n\"We use data-per-call limits to prevent a query from retrieving too much data beyond what the system can handle. There are 2 types of data limits:\nBy number of rows in response, and\nBy number of data points required to compute the total, such as summary row.\"\nAny way I can do this? And, another question, is there like any way to pull raw data from facebook ad account, like a dump of all the data that resides on facebook for an ad account?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":108,"Q_Id":43731132,"Users Score":0,"Answer":"The first thing is to try is to add the limit parameter, which limits the number of results returned per page. \nHowever, if the account has a large amount of history, the likelihood is that the total amount of data is too great, and in this case, you'll have to query ranges of data. \nAs you're looking for data by individual day, I'd start trying to query for month blocks, and if this is still too much data, query for each date individually.","Q_Score":0,"Tags":"python,facebook,facebook-graph-api,facebook-ads-api","A_Id":44020372,"CreationDate":"2017-05-02T06:05:00.000","Title":"Get all data since creation until today from ad account using facebook ads api for python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to build an app in Django that lets the user do some task everyday at the time they specify at runtime.\nI have looked at Celery but couldn't\u200b find anything that will help. I found apply_async and I can get the task to execute once at the specificied duration but not recurrent. I am missing something but don't know what. \nPlease suggest how can I achieve this.","AnswerCount":5,"Available Count":1,"Score":0.0798297691,"is_accepted":false,"ViewCount":6721,"Q_Id":43733387,"Users Score":2,"Answer":"There is django-celery-beat package which allows you to dynamicly add tasks to database and then they are executed as you defined in database.(e.g. every 5 minutes) But currently they have bug which causes that task is not appended to celery queue when added to database. One suggested workaround is to restart celery process every time that new task is added. \nI solved it with Dan Baders schedule package. I scheduled task on every minute which checks database for tasks that need to be executed in current minute. Then I start each of this tasks in new thread.\nHope this helps.","Q_Score":6,"Tags":"python,django,celery","A_Id":43733656,"CreationDate":"2017-05-02T08:29:00.000","Title":"How to dynamically schedule tasks in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have some text fields in my Django model that are filled by a script, with values in English (the list of values is known). \nBut the app is actually made for Russian clients only. I'd like to translate those fields into Russian, and here comes a little question. These values are taken from an API response, which means I should check the value to translate it. What's faster: to check and translate fields in template or to make extra fields and translate strings in the Python script?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":40,"Q_Id":43740269,"Users Score":0,"Answer":"The problem is overhead of compiling Templates when rendering. So the more complicated the template gets (method calls etc), the performance tends to get slow (like py files are converted to pyc). Django has template caching but that also is limited (I don't know how much). I have faced performance issue because of lot of logic in templates. Plus its always good to have a dumb client (template). I will prefer the Python approach because of the idea to keep client thin and not because of the performance gap.  Plus if tomorrow you need to add one more language then changing templates is always going to be difficult  then server.","Q_Score":0,"Tags":"python,django","A_Id":43740807,"CreationDate":"2017-05-02T14:20:00.000","Title":"Django. Check in template or use an extra field?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm learning Django but the ORM doesn't give a way to have a text primary key.I would like to have a primary such as 00RTTIN223.Is there any other way to bypass that limite?","AnswerCount":3,"Available Count":1,"Score":0.0665680765,"is_accepted":false,"ViewCount":6788,"Q_Id":43756353,"Users Score":1,"Answer":"Try using CharField with unique=True and primary_key=True","Q_Score":3,"Tags":"python,django","A_Id":43756404,"CreationDate":"2017-05-03T09:37:00.000","Title":"How to use text type as primary key in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I know how to write and read from a file in S3 using boto. I'm wondering if there is a way to append to a file without having to download the file and re-upload an edited version?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":4234,"Q_Id":43791236,"Users Score":5,"Answer":"There is no way to append data to an existing object in S3.  You would have to grab the data locally, add the extra data, and then write it back to S3.","Q_Score":5,"Tags":"python-3.x,amazon-s3,boto,boto3","A_Id":43791579,"CreationDate":"2017-05-04T19:24:00.000","Title":"Appending to a text file in S3","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to deploy a Flask app on an EC2 instance running Ubuntu.  I have my WSGI file set up, but I'm having some issues running gunicorn.  At first, I installed gunicorn with sudo apt-get install gunicorn.  However, it ran with the wrong version of python, and it threw import errors for each of the modules my Flask app uses.  I ascertained that this was due to the fact that I use conda as an environment manager, and because installing with apt-get placed gunicorn outside of the purview virtual environment.  So, I uninstalled gunicorn (sudo apt-get purge gunicorn) and reinstalled it through conda (conda install gunicorn).  Now, when I run gunicorn (gunicorn --bind 0.0.0.0:8000 wsgi:app), I don't get a 50 line traceback.  I do, however, get the following error: -bash: \/usr\/bin\/gunicorn: No such file or directory.  I tried uninstalling gunicorn and reinstalling with pip, but I still get the same error.  I've tried searching Google and StackOverflow for solutions, but all I've discovered is that I should be installing gunicorn within a virtual environment to overcome this error (which, I beleive, I'm already doing).  I'm guessing there's an easy fix to this, and that the problem is related to my ineptitude, as opposed to conda or something else.  Any suggestions would be much appreciated.  Thanks.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":3262,"Q_Id":43809618,"Users Score":5,"Answer":"So, I was right - the problem is entirely related to my own ineptitude.  Rather than deleting this question, though, I'm going to answer it myself and leave it here in case any future fledgling developers run into the same problem.  The issue, as it turns out, is that I was running gunicorn --bind 0.0.0.0:8000 wsgi:app in the wrong directory.  After I cd into the directory containing wsgi.py, gunicorn works just fine.  The takeaway: gunicorn must be run from within the directory containing wsgi.py.","Q_Score":4,"Tags":"python,ubuntu,gunicorn,conda","A_Id":43809861,"CreationDate":"2017-05-05T16:21:00.000","Title":"Running gunicorn on Ubuntu in a conda environment","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"For optimization purposes, I need to my spider to skip website that has been once timed out, and dont let scrapy que it and try it again and again. \nHow can this be achieved?\nThanks.","AnswerCount":1,"Available Count":1,"Score":-0.1973753202,"is_accepted":false,"ViewCount":117,"Q_Id":43827307,"Users Score":-1,"Answer":"I just found out,\nin setting set :\n\"RETRY_ENABLED = False\" that will take care of it :)","Q_Score":0,"Tags":"python,scrapy,scrapy-spider","A_Id":43827353,"CreationDate":"2017-05-07T02:41:00.000","Title":"How to not allow scrapy to retry timed out websites?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In IPython\/Jupyter notebooks, is there a clear, concise summary of the 'rules' for when markdown is rendered into that nice, rich text format that's pleasant to look at?\nHere's what I've got so far:\n\nWhen I create a new cell, then switch it to 'Markdown' it stays in 'raw markdown mode' (meaning: I can see the raw markdown.  There's some nice, syntax-based color-coding and font-sizing, but it's clearly raw markdown)\nIf I save the notebook, close it (i.e., close the browser's page) and then re-open the notebook I see the nice, rich-text version of the markdown (i.e., \"#Topic 1\" is rendered as H1 by the browser, and the browser hides the \"#\" at the start - it's clearly NOT the 'raw markdown'\nIf I click on the markdown cell it remains in 'nice mode'\nIf I press the 'Enter' key I enter Jupyter's edit mode, it replaces the 'nice mode' view with the 'raw markdown mode' view, and I can edit the markdown.\n\nWhat I'd love to know is:\nHow do I get Jupyter to render that 'raw markdown mode' cell again? (Without closing and re-opening the notebook)\n(Alternately -is this the expected behavior?  You get the nice view when you first load it, and you're stuck with the 'raw markdown' view for any cell you edit until you reload it?)","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":11457,"Q_Id":43827784,"Users Score":34,"Answer":"You just need to execute or run the cell which is in markdown format.  \nIf you press Ctrl + Enter will execute and convert the raw text to markdown form.  \nOr you can press Shift + Enter which will execute the current cell and will move to the next one.","Q_Score":24,"Tags":"ipython,jupyter-notebook,jupyter","A_Id":43827809,"CreationDate":"2017-05-07T04:21:00.000","Title":"IPython\/Jupyter Notebook: How to render a markdown cell without reloading doc?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using one of the examples in the tutorial as a basis to model call center simulation.\nSimulation is for one hour window (max simulation time of 60 minutes). When I execute env.run(until = 60) calls arrive even few seconds before 60 minute ends, which is quite ok and realistic.\nI'm trying to have the simulation terminate when the resource served this last call. Is there a way to do this?\nAny guidance or advice on this is greatly appreciated.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":489,"Q_Id":43842363,"Users Score":0,"Answer":"You can pass any event to env.run(until=event).  The simulation will run until this event has been triggered.\nenv.run(until=60) is just a shortcut for env.run(until=env.timeout(60)) (if env.now == 0).","Q_Score":1,"Tags":"python,simpy","A_Id":43845103,"CreationDate":"2017-05-08T07:47:00.000","Title":"Terminating SimPy simulation","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"i have written parameters in webpage & applying them by selecting apply button. \n1. apply button is getting clicked for web elements outside frame using below command \nbrowser1.find_element_by_name(\"action\").click()\n\napply button not getting clicked when saving the paramters inside a frame of web page using same command\nbrowser1.find_element_by_name(\"action\").click()","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1392,"Q_Id":43846875,"Users Score":0,"Answer":"I do not know the Python syntax, but in Selenium you have to switch to the frame much like you would switch to a new tab or window before performing your click.\nThe syntax in Java would be: driver.switchTo().frame();","Q_Score":0,"Tags":"python-3.x,selenium","A_Id":43850009,"CreationDate":"2017-05-08T11:48:00.000","Title":"click() method not working inside a frame in selenium python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Flask app running on Heroku. \nInstalling from requirements.txt is failing as later packages depend on the on the earlier ones to be installed first. \nIs there a way to stagger these installs, or to run a bash script to install one at a time when the dyno is spun up?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":39,"Q_Id":43857305,"Users Score":0,"Answer":"Okay so a workaround: \nRemove the latter package in the requirements.txt file which depends on the earlier one. Deploy to heroku so the earlier one is installed. Then add back the package you removed and deploy again. Huzzah!","Q_Score":0,"Tags":"python,heroku,pip","A_Id":43857760,"CreationDate":"2017-05-08T21:09:00.000","Title":"Staggered install of pip requirements on Heroku","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to be able to apply a list filter based on a known foreign-key value without showing the sidebar at all. \nI have 3 schools with IDs 1, 2 & 3.\nI have 39 programs, each having various fields, one of which being 'school' a foreign-key to schools table, and 39 records having either 1, 2, or 3 in 'school' field.\nIn admin.py, I create a ProgramsAdmin with list_filter = (('school')).  This works perfectly, with the 3 schools appearing in sidebar. Clicking on any of them properly filters the programs.\nSince user is going to log in and select the school they are working on, I want the list to be filtered without seeing the sidebar.  Chosen school will be stored in database in settings table, but for now I just want to get it to work hard-coded to 1, 2 or 3 and not show sidebar.\nThis works SO easy in models.py, filtering a many-to-many relationship, just using limit_choices_to clause.  Not so easy filtering in admin.  Is it even possible to filter the admin on a hard-coded value, or a function which returns a filter value like limit_choices_to does?\nThanks...","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":509,"Q_Id":43857661,"Users Score":0,"Answer":"The Django Admin is intended as a really basic administration panel, not a staff tool or content management system. It doesn't have any notion of roles or user access levels, so any user in the Admin can edit any other users' records.\nWhat you're trying to do goes way beyond what the Django Admin was designed to do. If you want custom behaviour or appearance, you should build actual pages using ModelViews. That way you can apply apply per-user restrictions on what they can see and modify.\nIf that's more work than you anticipated then you should probably just accept what the Django Admin gives you.","Q_Score":0,"Tags":"python,django","A_Id":43857755,"CreationDate":"2017-05-08T21:37:00.000","Title":"Django Admin List Filter Without Sidebar","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm running Django 1.8.18 and django-auth-ldap 1.2.11 authenticating against Active Directory.\nMy current configuration authenticates properly against the AD, however, when I enabled AUTH_LDAP_FIND_GROUPS_PERMS it doesn't seem to do anything. I've previously tried AUTH_LDAP_MIRROR_GROUPS (which works without any problem), and found all of the user's groups created. The only slight issue is that it also remove any local group memberships the user had.\nIn any case, after having the groups auto-created by AUTH_LDAP_MIRROR_GROUPS I would expect AUTH_LDAP_FIND_GROUPS_PERMS would auto-add the user to that same group on the next login. However, this did not happen. The only change in configuration was those two lines. The AUTH_LDAP_GROUP_TYPE is set to NestedActiveDirectoryGroupType()\nAny ideas why users aren't being added to the groups with matching names?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1265,"Q_Id":43860814,"Users Score":3,"Answer":"Turns out that AUTH_LDAP_FIND_GROUPS_PERMS doesn't actually add users to a group, but virtually adds them to it making sure their permissions respond as if they are in the groups that match names.","Q_Score":1,"Tags":"python,django,ldap,django-auth-ldap","A_Id":43929764,"CreationDate":"2017-05-09T03:55:00.000","Title":"django-auth-ldap AUTH_LDAP_FIND_GROUPS_PERMS not working","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a page that I want to behave like this: First, the user only sees a single form, for the sake of example, lets say it allows the user to select the type of product. Upon submitting this form, a second form (whose contents depend on the product type) appears below it. The user can then either fill out the second form and submit it, or revise and resubmit the first form - either way I want the first form to maintain the user's input (in this case, the product type), even if the second form is submitted.\nHow can I do this cleanly in django? What I am struggling with is preserving the data in the first form: e.g. if the user submits the second form and it has validation errors, when the page displays the first form the product type will be rendered blank but I want the option to remain set to what the user picked. This behaviour isn't mysterious or unexpected, but is not what I want. Also, if the user submits the second form successfully, I would like to redirect so that the first form maintains the selection and the second form is cleared. \nThe best that I've thought of is mucking up the URL with the fields of the first form (admittedly not too many parameters) and storing its state there, or combining both forms into one form object in HTML and responding differently based on the name of the submit button (though I don't see how I could use a redirect to clear the second form and keep the first if I do this). Are there any cleaner, more obvious ways that I'm missing? Thanks.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":35,"Q_Id":43862233,"Users Score":0,"Answer":"may be you can store the first form values in session and provide them as initial data for the first form when you are rendering the second form with error. For eg: data={\"f1\":request.session['abc'],\"f2\":request.session[\"xyz\"]} form1 = abc(initial=data)","Q_Score":0,"Tags":"python,django,forms","A_Id":43864634,"CreationDate":"2017-05-09T06:03:00.000","Title":"Retain edit data for one form when submitting a second","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I use community pycharm and the version of python is 3.6.1, django is 1.11.1. This warning has no affect on running, but I cannot use the IDE's auto complete.","AnswerCount":6,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":51524,"Q_Id":43865989,"Users Score":153,"Answer":"You need to enable Django support. Go to \n\nPyCharm -> Preferences -> Languages & Frameworks -> Django \n\nand then check Enable Django Support","Q_Score":84,"Tags":"python,django,pycharm","A_Id":43867016,"CreationDate":"2017-05-09T09:22:00.000","Title":"Unresolved attribute reference 'objects' for class '' in PyCharm","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"With Django,\nIs it better to have a virtualenv created at project level. \nOr,\nis it better to have a virtualenv per app within a single project?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":62,"Q_Id":43881785,"Users Score":5,"Answer":"All the apps installed (INSTALLED_APPS) within a single project run under the same python process, so it's going to be one virtualenv for all apps.\nIf you have an app that requires a specific python environment and the others really aren't able to run in that environment (for example, if one app requires python3 and another requires python2), then you would have to run the problem app in its own Django application server instance.\nSince normally you would have nginx or Apache in front of your Django instance, you could have multiple Django instances appear to be one server.  But it's a situation you'd want to avoid.","Q_Score":1,"Tags":"python,django,virtualenv","A_Id":43881812,"CreationDate":"2017-05-10T00:25:00.000","Title":"Virtualenv for Django dev, better to be at Project or App level?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I write a very simple flask server. This server response to GET and give back my home.html.\nI visit the site on 127.0.0.1:5000\neverything is good till now.\nHowever, if I keep pressing \"fresh\" (Command+R on my computer) a lot of times for a few second, as fast as I can, then, my flask give this error and breaks down.\n\nException in thread Thread-1:\n  Traceback (most recent call last):\n    File \"\/usr\/local\/Cellar\/python\/2.7.11\/Frameworks\/Python.framework\/Versions\/2.7\/lib\/python2.7\/threading.py\", line 801, in bootstrap_inner\n      self.run()\n    File \"\/usr\/local\/Cellar\/python\/2.7.11\/Frameworks\/Python.framework\/Versions\/2.7\/lib\/python2.7\/threading.py\", line 754, in run\n      self.__target(*self.__args, **self.__kwargs)\n    File \"\/usr\/local\/lib\/python2.7\/site-packages\/werkzeug\/serving.py\", line 659, in inner\n      srv.serve_forever()\n    File \"\/usr\/local\/lib\/python2.7\/site-packages\/werkzeug\/serving.py\", line 499, in serve_forever\n      HTTPServer.serve_forever(self)\n    File \"\/usr\/local\/Cellar\/python\/2.7.11\/Frameworks\/Python.framework\/Versions\/2.7\/lib\/python2.7\/SocketServer.py\", line 238, in serve_forever\n      self._handle_request_noblock()\n    File \"\/usr\/local\/Cellar\/python\/2.7.11\/Frameworks\/Python.framework\/Versions\/2.7\/lib\/python2.7\/SocketServer.py\", line 297, in _handle_request_noblock\n      self.handle_error(request, client_address)\n    File \"\/usr\/local\/Cellar\/python\/2.7.11\/Frameworks\/Python.framework\/Versions\/2.7\/lib\/python2.7\/SocketServer.py\", line 295, in _handle_request_noblock\n      self.process_request(request, client_address)\n    File \"\/usr\/local\/Cellar\/python\/2.7.11\/Frameworks\/Python.framework\/Versions\/2.7\/lib\/python2.7\/SocketServer.py\", line 321, in process_request\n      self.finish_request(request, client_address)\n    File \"\/usr\/local\/Cellar\/python\/2.7.11\/Frameworks\/Python.framework\/Versions\/2.7\/lib\/python2.7\/SocketServer.py\", line 334, in finish_request\n      self.RequestHandlerClass(request, client_address, self)\n    File \"\/usr\/local\/Cellar\/python\/2.7.11\/Frameworks\/Python.framework\/Versions\/2.7\/lib\/python2.7\/SocketServer.py\", line 655, in __init\n      self.handle()\n    File \"\/usr\/local\/lib\/python2.7\/site-packages\/werkzeug\/serving.py\", line 216, in handle\n      rv = BaseHTTPRequestHandler.handle(self)\n    File \"\/usr\/local\/Cellar\/python\/2.7.11\/Frameworks\/Python.framework\/Versions\/2.7\/lib\/python2.7\/BaseHTTPServer.py\", line 340, in handle\n      self.handle_one_request()\n    File \"\/usr\/local\/lib\/python2.7\/site-packages\/werkzeug\/serving.py\", line 251, in handle_one_request\n      return self.run_wsgi()\n    File \"\/usr\/local\/lib\/python2.7\/site-packages\/werkzeug\/serving.py\", line 193, in run_wsgi\n      execute(self.server.app)\n    File \"\/usr\/local\/lib\/python2.7\/site-packages\/werkzeug\/serving.py\", line 184, in execute\n      write(data)\n    File \"\/usr\/local\/lib\/python2.7\/site-packages\/werkzeug\/serving.py\", line 152, in write\n      self.send_header(key, value)\n    File \"\/usr\/local\/Cellar\/python\/2.7.11\/Frameworks\/Python.framework\/Versions\/2.7\/lib\/python2.7\/BaseHTTPServer.py\", line 401, in send_header\n      self.wfile.write(\"%s: %s\\r\\n\" % (keyword, value))\n  IOError: [Errno 32] Broken pipe\n\nI believe this is what happened: When my server was trying to transmit html to my browser, I pressed the refresh and broke the pipe. So my server got confused and then give error.\nHow to solve this problem? Or this site is not usable as all since anyone who ask constantly for my page can break my webpage down.\nThanks!","AnswerCount":5,"Available Count":1,"Score":0.0399786803,"is_accepted":false,"ViewCount":4808,"Q_Id":43893208,"Users Score":1,"Answer":"This error appear because your server is overloaded! Stop and start it!","Q_Score":3,"Tags":"python,flask,server","A_Id":43896817,"CreationDate":"2017-05-10T12:58:00.000","Title":"Flask gives \"error 32 broken pipe\" when being requested too often","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Has anyone here ever worked with chalice?  Its an aws tool for creating api's.  I want to use it to create a single page application, but Im not sure how to actually serve html from it.  I've seen videos where its explored, but I can't figure out how they actually built the thing.  Anyone have any advice on where to go, how to start this?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":923,"Q_Id":43898566,"Users Score":1,"Answer":"You wouldn't serve HTML from Chalice directly. It is explicitly designed to work in concert with AWS Lambda and API Gateway to serve dynamic, API-centric content. For the static parts of an SPA, you would use a web server (nginx or Apache) or S3 (with or without CloudFront). \nAssuming you are interested in a purely \"serverless\" application model, I suggest looking into using the API Gateway \"Proxy\" resource type, forwarding to static resources on S3. \nWorth noting that it's probably possible to serve HTML from Chalice, but from an architecture perspective, that's not the intent of the framework and you'd be swimming upstream to get all the capabilities and benefits from tools purpose-built for serving static traffic (full HTTP semantics w\/ caching, conditional gets, etc)","Q_Score":1,"Tags":"python,amazon-web-services,chalice","A_Id":44975845,"CreationDate":"2017-05-10T16:54:00.000","Title":"Using aws chalice to build a single page application?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So I'm sending an item to my html page and put a value off this item in an input.\nWhat i want is when i change the input, i want to dynamically print the new value next to the input.\nSomething like that :\n\n<input type='text' value=\"{{item.qty}}\"\/>\n  {{myNewInputValue}}\n\nI know how to do this with angular but don't know if it's possible with Python\nThanks","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":61,"Q_Id":43922344,"Users Score":0,"Answer":"Unfortunately you can't do this directly with Django. You'll have to set up an AJAX handler (probably on keypress) in order to do this.","Q_Score":1,"Tags":"django,python-2.7,jinja2","A_Id":43922380,"CreationDate":"2017-05-11T17:44:00.000","Title":"How to show input value next to it ? Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"On AWS, I created a  new lambda function. I added a role to the lambda that has the policy, AWSLambdaVPCAccessExecutionRole. I placed the lambda in the same VPC as my EC2 instance and made sure the security group assigned to the lambda and EC2 instance have the same default VPC security group created by AWS which allows all traffic within the vpc. On my EC2 instance, I have a tomcat app running on port 8080. I tried to hit the URL by two methods in my lambda function:\n\nUsing my load balancer, which has the same assigned security group\nHitting the IP address of the EC2 box with port 8080\n\nBoth of these options do not work for the lambda function. I tried it on my local computer and it is fine.\nAny suggestions?\nSecurity Group for Inbound\n\nType = All Traffic\nProtocol = All\nPort Range = All\nSource = Group ID of Security Group","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1713,"Q_Id":43923482,"Users Score":0,"Answer":"has the security group 8080 port open to internet?\nTo connect Lambdas with VPC you can't use the default VPC, you have to create one with a nat gateway. \nEDIT: Only if the Lambda fucntion needs to access to internet and VPC.","Q_Score":0,"Tags":"python,amazon-web-services,tomcat,amazon-ec2,aws-lambda","A_Id":43923646,"CreationDate":"2017-05-11T18:51:00.000","Title":"AWS Lambda function can't communicate with EC2 Instance","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am still pretty new to python, and I need html5lib for a project, but when I run pip install html5lib, here's what I get:\n\nError: [('\/System\/Library\/Frameworks\/Python.framework\/Versions\/2.7\/Extras\/lib\/python\/_markerlib\/init.py', '\/var\/folders\/yr\/8762117x5h7_pwb9fx5f0tzr0000gn\/T\/pip-uiZ0aQ-uninstall\/System\/Library\/Frameworks\/Python.framework\/Versions\/2.7\/Extras\/lib\/python\/_markerlib\/init.py', \"[Errno 1] Operation not permitted: '\/var\/folders\/yr\/8762117x5h7_pwb9fx5f0tzr0000gn\/T\/pip-uiZ0aQ-uninstall\/System\/Library\/Frameworks\/Python.framework\/Versions\/2.7\/Extras\/lib\/python\/_markerlib\/init.py'\"), ('\/System\/Library\/Frameworks\/Python.framework\/Versions\/2.7\/Extras\/lib\/python\/_markerlib\/init.pyc', '\/var\/folders\/yr\/8762117x5h7_pwb9fx5f0tzr0000gn\/T\/pip-uiZ0aQ-uninstall\/System\/Library\/Frameworks\/Python.framework\/Versions\/2.7\/Extras\/lib\/python\/_markerlib\/init.pyc', \"[Errno 1] Operation not permitted: '\/var\/folders\/yr\/8762117x5h7_pwb9fx5f0tzr0000gn\/T\/pip-uiZ0aQ-uninstall\/System\/Library\/Frameworks\/Python.framework\/Versions\/2.7\/Extras\/lib\/python\/_markerlib\/init.pyc'\"), ('\/System\/Library\/Frameworks\/Python.framework\/Versions\/2.7\/Extras\/lib\/python\/_markerlib\/markers.py', '\/var\/folders\/yr\/8762117x5h7_pwb9fx5f0tzr0000gn\/T\/pip-uiZ0aQ-uninstall\/System\/Library\/Frameworks\/Python.framework\/Versions\/2.7\/Extras\/lib\/python\/_markerlib\/markers.py', \"[Errno 1] Operation not permitted: '\/var\/folders\/yr\/8762117x5h7_pwb9fx5f0tzr0000gn\/T\/pip-uiZ0aQ-uninstall\/System\/Library\/Frameworks\/Python.framework\/Versions\/2.7\/Extras\/lib\/python\/_markerlib\/markers.py'\"), ('\/System\/Library\/Frameworks\/Python.framework\/Versions\/2.7\/Extras\/lib\/python\/_markerlib\/markers.pyc', '\/var\/folders\/yr\/8762117x5h7_pwb9fx5f0tzr0000gn\/T\/pip-uiZ0aQ-uninstall\/System\/Library\/Frameworks\/Python.framework\/Versions\/2.7\/Extras\/lib\/python\/_markerlib\/markers.pyc', \"[Errno 1] Operation not permitted: '\/var\/folders\/yr\/8762117x5h7_pwb9fx5f0tzr0000gn\/T\/pip-uiZ0aQ-uninstall\/System\/Library\/Frameworks\/Python.framework\/Versions\/2.7\/Extras\/lib\/python\/_markerlib\/markers.pyc'\"), ('\/System\/Library\/Frameworks\/Python.framework\/Versions\/2.7\/Extras\/lib\/python\/_markerlib', '\/var\/folders\/yr\/8762117x5h7_pwb9fx5f0tzr0000gn\/T\/pip-uiZ0aQ-uninstall\/System\/Library\/Frameworks\/Python.framework\/Versions\/2.7\/Extras\/lib\/python\/_markerlib', \"[Errno 1] Operation not permitted: '\/var\/folders\/yr\/8762117x5h7_pwb9fx5f0tzr0000gn\/T\/pip-uiZ0aQ-uninstall\/System\/Library\/Frameworks\/Python.framework\/Versions\/2.7\/Extras\/lib\/python\/_markerlib'\")]\n\nReally long gross error, I know, but I'm not sure what is going on. I've actually had errors trying to install other python packages as well and I am not sure what the problem is. Any help or insight would be greatly aprecaited, thanks!","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1726,"Q_Id":43927525,"Users Score":0,"Answer":"I think you're on a Mac.\nAnd it smells like you are trying to install into the system-level Python directories without being root (hence, \"Operation not permitted.\")\nSee if you have the \"virtualenv\" command on your system (you probably do), and then read up on that for how to use it.  (You really want it.)","Q_Score":0,"Tags":"python,python-2.7,html5lib","A_Id":43927551,"CreationDate":"2017-05-12T00:20:00.000","Title":"Error when trying to install html5lib","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I tried to research on all related topics here and googled it but the django-admin command is not doing anything whenever I type it in CMD (win 7).\nIt only opens my pycharm and shows codes inside the django-admin.py. I already added it to environment variables and tried these syntax but didn't work (I was able to create and run virtual environment):\nversion1:\ndjango-admin startproject mysite\nversion2:\ndjango-admin.py startproject mysite\nversion3:\npath-to-django-admin\\django-admin.py startproject mysite\nI even tried to copy the django-admin.py on my project folder but didn't do any good.","AnswerCount":3,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1335,"Q_Id":43928517,"Users Score":1,"Answer":"Exprator's answer worked for me. I installed Django while inside virtualenv and did \"django-admin --version\", it works fine then I did the code: \"django-admin startproject mysite .\" (The period is included) and it worked. Finally the manage.py showed up inside the project folder.","Q_Score":0,"Tags":"python,django,windows-7","A_Id":43939021,"CreationDate":"2017-05-12T02:50:00.000","Title":"Django-admin is not working Django 1.11 Python 3.6","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was wondering how exactly is the request handled, I mean,I think it's something like this:\n\nNginx receives the request, does initial handling based on configuration,passes to Gunicorn\nGunicorn receives it, and initiate a instance of the Flask app, with the request data\nFlask app receives the request data, and does the work it was programmed to\n\nIs it something like this? Does a new instance of the Flask app get initiated at each request?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":538,"Q_Id":43941174,"Users Score":2,"Answer":"Not quite. Basically flask is the webapp, it gets loaded when gunicorn starts up. \nAt that point the flask app is up and running and gunicorn itself can answer requests by sending them to the flask app within its python processes (ie, no net traffic).\nNginx sits on top of gunicorn and proxies requests between clients and gunicorn as gunicorn is not a web server.\nSo nginx -> gunicorn -> flask (loaded by gunicorn itself)\nWhen gunicorn starts up, it loads and initialises the flask app on its own. Doing that on every request would be very slow.\nNginx just proxies to gunicorn's listening port. It does not load a Flask app by itself, which is really a WSGI compliant Python webapp.","Q_Score":1,"Tags":"python,python-3.x,nginx,gunicorn","A_Id":43942327,"CreationDate":"2017-05-12T15:15:00.000","Title":"How does the Flask-Gunicorn-Nginx setup works under the hood?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Ok, I am connecting my Django app to Microsoft Graph API to get my user photo. The problem is that I cant  find how to transform the 64base not encoded binary data to a file I can use. I have been reading and searching for about 2 hours, with no luck.\nThanks for your help.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":116,"Q_Id":43945538,"Users Score":0,"Answer":"Well, I got confused among Microsoft API manual and base64 information everywhere. I just needed to write the raw binary from Microsoft Graph API to a jpg file openend in binary mode, and thats was it.","Q_Score":0,"Tags":"python,django,base64,microsoft-graph-api","A_Id":43986333,"CreationDate":"2017-05-12T19:54:00.000","Title":"Microsoft Graph binary photo to file in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've created a new module in odoo 10 with diff\u00e9rents menus, now I want to create a user who have some menus of this module. So I created the user but when I tried to create the group (in order to associte to the groupe the menu) in the field application I can't find the module that I've created. I've  seted in the manifest file the field application to true and I've checked in the database in ir_module the field is true. Can someone help me please","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":413,"Q_Id":43964318,"Users Score":0,"Answer":"In real it's a fake problem because the field \"Application\" in the form corresponds to an Application category not Application (or module) so a users group (from the menu Setting -> Users -> Groups ) will be applied to a set of Applications (Modules) not for a unique application, so if anyone want to make a group for a unique module he could name the category attribute in the manifest file the as the same of the application (module name)\nso try to get the category of your application and choose it from the list.","Q_Score":0,"Tags":"python,openerp","A_Id":44001967,"CreationDate":"2017-05-14T13:15:00.000","Title":"odoo 10 creating a group and associate it to a custom module","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using normal html table, and I am having more than 1000 records to display. So,I used pagination concept and make 100 results per page.\nThe problem is, for the serial number column, Iam using forloop counter, for first page I got serial numbers as 1 to 100, for second page also I am getting serial numbers as 1 to 100.\nWhat I need is, it has to be 101 to 200 for second page and for third page it has to be 201 to 300, but it is showing 1 to 100.\nHow to make serial number like I am expecting?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":187,"Q_Id":43972774,"Users Score":1,"Answer":"Well, you can solve it like this:\n\nInstall mathfilters:\npip install django-mathfilters\nAdd 'mathfilters' to Installed_Apps\nReplace {{ forloop.counetr }} by something like this in your template:\n\n{{ page_obj.number|add:-1|mul:page_obj.paginator.per_page|add:forloop.counter }}\nwhere:\npage_obj.number - page number\npage_obj.paginator.per_page - number of items on page","Q_Score":0,"Tags":"python,html,django,django-templates","A_Id":44286610,"CreationDate":"2017-05-15T06:29:00.000","Title":"Forloop counter with dynamic value range","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"What is the major difference in these test classes django.test.TestCase and rest_framework.test.APITestCase . which is Better to test my views.py ?\ncan you suggest me documentations to understand about these.\nThank you in advance. :-)","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":1881,"Q_Id":43973305,"Users Score":1,"Answer":"APITestCase in rest_framework.test is to test the api's in the rest. It is specific for the api operations and api calls.\nDjango.test.TestCase is used to test the Django classes.","Q_Score":2,"Tags":"python-3.x,unit-testing,django-rest-framework,django-testing,web-api-testing","A_Id":43977762,"CreationDate":"2017-05-15T07:04:00.000","Title":"what is difference between `django.test.APITestCase` and `rest_framework.test.TestCase` in `python-django`","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Greeting;\nI have created a new module named phpevaluation, and i want to configure security on this module (who use what), so i have to create a set of users groups to define my types of access, the problem is in the users group form , when I try to choose my created module from the list of applications I could not found it;\n-I named the module phpevaluation (without dashes nor underscores)\n-Inside my manifest.py file the application attribute is setted to True\n-When I access using pgAdmin to the \"ir_module_module\" table I find the record and the \"application\" attribute is correction setted to True\nI am using Odoo 10","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":288,"Q_Id":43975795,"Users Score":0,"Answer":"In real it was a fake probelm because the field \"Application\" in the form corresponds to an Application category not Application (or module)\nso a users group (from the menu Setting -> Users -> Groups ) will be applied to a set of Applications (Modules) not for a unique application, so if anyone want to make a groupd for a unique module he could name the category attribute in the manifest file the as the same of the application (module name)","Q_Score":0,"Tags":"python,openerp,odoo-8,erp,odoo-10","A_Id":43982399,"CreationDate":"2017-05-15T09:26:00.000","Title":"Odoo security : My Module not found in the applications list when creating new users group","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to make a site like Codeacademy. Where users can learn Python online,\nsolve problems and master theory.\nFramework for the server is Ruby On Rails\nI am trying to understand how can I translate python's code to the server, then execute this code on the server? Any python's interpreters created in Ruby? I totally can not understand how this should work.\nPython's version: 2.7 or 3.5 (Not fundamentally)\nThank you for attention","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":81,"Q_Id":44000085,"Users Score":0,"Answer":"As other have stated, there are serious security implications for letting users blindly run things on your server, but if you really wanted to, you could write the python to a file and then execute the python using system \"python #{file_path}\".\nI'm not too familiar with python, but you could probably switch stdout and stderr to write to files and then read those files to get any print statements.","Q_Score":0,"Tags":"python,ruby-on-rails,ruby","A_Id":44006799,"CreationDate":"2017-05-16T11:20:00.000","Title":"Python embedded in RubyOnRails","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have sqlite db runing on my server. I want to access it using client side javascript in browser. Is this possible?\nAs of now, I am using python to access the db and calling python scripts for db operations.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":158,"Q_Id":44000687,"Users Score":1,"Answer":"It's not a good idea to allow clients to access directly to the db. If you have to do it be carefull to not give to the account you use full write\/read access to the db or any malicius client can erase modify or steal information from the db.\nAn implementation with client identification server-side and rest API to return or modify DB it's safer.","Q_Score":0,"Tags":"javascript,python,sql,sqlite","A_Id":44001568,"CreationDate":"2017-05-16T11:51:00.000","Title":"Access sqlite in server through client side javascript","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I use pyaudio with python2.7.13 to record wav ,but my pragram dead when I record more than 1 hour , how can I do if I want to record for more than 1 hour with py2.7. Thanks for your replay!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":204,"Q_Id":44006560,"Users Score":2,"Answer":"Surely you can record audio for more than an hour using pyaudio. Try invoking the recording function in a thread and put the main process in a loop or sleep for that period. \nNote: Make sure you do not run out of memory.","Q_Score":0,"Tags":"python,pyaudio","A_Id":44007671,"CreationDate":"2017-05-16T16:12:00.000","Title":"I want to use pyaudio to record wav more than hours","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to install mysqlclient on mac to use mysql in a django project. I have made sure that setup tools is installed and that mysql connector c is installed as well. I keep getting the error Command \"python setup.py egg_info\" failed with error code 1 in. This is my first django project since switching from rails. Is there something I am missing? I am using python 3 and I use pip install mysqlclient.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":599,"Q_Id":44008037,"Users Score":0,"Answer":"I was able to fix this by running pip install mysql. I do not understand why this worked because I already had MySQL installed on my system and had been using it.\nI am going to assume it is because Python uses environments and MySQL wasn't installed in the environment but I would like to know for sure.","Q_Score":0,"Tags":"python,mysql,django,pip","A_Id":44036652,"CreationDate":"2017-05-16T17:32:00.000","Title":"Mysqlclient fails to install","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Flask Documentation states:\n\nDynamic web applications also need static files. That\u2019s usually where\n  the CSS and JavaScript files are coming from. Ideally your web server\n  is configured to serve them for you, but during development Flask can\n  do that as well. Just create a folder called static in your package or\n  next to your module and it will be available at \/static on the\n  application.\n\nBut in my webapp, when I try to acces localhost:5000\/static\/, I get a 404 error on the browser. What is more weird is that when I run it in debug mode, I get a 200 (ok) on the terminal, and 404 on the browser.\nCould you explain what is happening? I want a directory listing of my static directory on the browser.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":587,"Q_Id":44011414,"Users Score":2,"Answer":"Files you put in the \/static folder will be accessible, but flask doesn't do directory listing. So if you put a script.js in \/static\/js for instance, you should be able to GET \/static\/js\/script.js even though GET \/static will 404.","Q_Score":0,"Tags":"python,flask,web-development-server","A_Id":44011562,"CreationDate":"2017-05-16T20:54:00.000","Title":"Flask - GET request to 'static' directory returns Error 404","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We are receiving an error:\n\nImportError: No module named OAuth2Client\n\nWe have noticed scores of questions around this topic, many unanswered and at least one answer that describes the solution of copying over files from the Google App Engine SDK. \nThis approach, however, seems tedious because all the dependencies are unclear. If we copy over oauth2client then run, the next error is another module that is missing. Fix that, then another module is missing, etc., etc. \nWhat is ironic is that we can see all the files and modules needed, listed from Google App Engine SDK right in PyCharm but they seem inaccessible to the script.\nIs there no better way to pull in all the files that oauth2client needs for Python to work on App Engine?","AnswerCount":5,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":80755,"Q_Id":44011776,"Users Score":0,"Answer":"Run this \nsudo python -m pip install oauth2client","Q_Score":49,"Tags":"python,google-app-engine,oauth-2.0","A_Id":55574741,"CreationDate":"2017-05-16T21:21:00.000","Title":"How to prevent \"ImportError: No module named oauth2client.client\" on Google App Engine?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Bottle as my webservice. Currently, its running on bottle's default wsgi server and handles HTTP requests. I want to encrypt my webservice and handle HTTPS requests. Can someone suggest a method for this. I tried running on cherrypy server, but the latest version is not supporting the pyOpenSSLAdapter.","AnswerCount":3,"Available Count":1,"Score":0.1325487884,"is_accepted":false,"ViewCount":4247,"Q_Id":44013107,"Users Score":2,"Answer":"You need to put your WSGI server (not WsgiRef certainly) behind a reverse-proxy with https support. Nginx is the most common choice.","Q_Score":8,"Tags":"python-3.x,https,cherrypy,bottle","A_Id":44016254,"CreationDate":"2017-05-16T23:18:00.000","Title":"How to make bottle server HTTPS python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm doing a project for a year 11 physics class and I'm trying to make a battery that generates electrons. This is the code:\nelectron = sphere(radius = 1, color = color.yellow, vel = vec(-1,0,0));\nwhile battery.voltage > 0:\n    eb = electron.clone(pos=vec(0,0,0), vel = vec(-1,0,0));\nI'm trying to make \"eb\" constantly, but it only applies  eb.pos = eb.pos + eb.vel * deltat; apply to a the first electron. Is there any way to do this without making 600 different electron objects?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":86,"Q_Id":44033590,"Users Score":0,"Answer":"You could change the attribute that is modified directly to the electron object instead of creating it all the time. Apply the modifications to electron and add the computing action in the while. Is it what you meant?","Q_Score":0,"Tags":"vpython","A_Id":44033675,"CreationDate":"2017-05-17T19:47:00.000","Title":"making objects constantly in a while loop","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have python flask app which loads to memory large file (3.5 GB). When I run that app in docker, it doesn't respond to requests, but container somehow works. When I try to run my app without loading that large file to memory it respons to requests.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":808,"Q_Id":44048555,"Users Score":3,"Answer":"By default docker does not restrict memory usage by containers. However, on Mac and Windows installs, Docker runs in a VM and that VM is limited in how much memory it takes from your OS. You can adjust this setting in the Docker preferences for Mac and Windows.","Q_Score":0,"Tags":"python,docker,flask","A_Id":44055755,"CreationDate":"2017-05-18T13:03:00.000","Title":"How to allocate more memory for docker container?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm trying to export a file as mp3 in pydub, but I get this error:\n\nAutomatic encoder selection failed for output stream #0:0. Default encoder for format mp3 is probably disabled. Please choose an encoder manually\n\nHow do I select an encoder manually, what is the default encoder, and how could I enable it?\nPS: My Pydub opens mp3 files without any problem. I'm using Windows and Libav.","AnswerCount":3,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":8086,"Q_Id":44058544,"Users Score":6,"Answer":"The other solution did not work for me. The problem for me was that the ffmpeg version that came installed with Anaconda did not seem to be compiled with an encoder. So instead of:\nDEA.L. mp3                  MP3 (MPEG audio layer 3) (decoders: mp3 mp3float mp3_at ) (encoders: libmp3lame )\nI saw:\nDEA.L. mp3                  MP3 (MPEG audio layer 3) (decoders: mp3 mp3float mp3_at )\nWithout the (encoders: ...) part.\nMy solution was to do this:\n\nffmpeg -codecs | grep mp3, to check if there is any encoder (there isn't!).\nconda uninstall ffmpeg\nOpen new terminal window.\nbrew install ffmpeg --with-libmp3lame\nffmpeg -codecs | grep mp3, to check if there is any encoder (now there is!).","Q_Score":5,"Tags":"python,audio,mp3,encoder,pydub","A_Id":48354157,"CreationDate":"2017-05-18T22:11:00.000","Title":"Pydub export error - Choose encoder manually","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"What should I know about saving files in production? I need to save lots media which are pdf files. The only thing I know so far, is that I shall rename pdf files into my own naming system (for example by overwriting storage in django). But what else is important ?\nOr that's all, just saving all files like 1.pdf,2.pdf,3.pdf,4.pdf.. in one media folder and it will work in long term without any other tricks and optimization? I am using django1.8 and python 2.7, but I guess it's very general question regarding running production server at all . \nI hope it's not off topic, as far I faced the lack of information on the issue.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":41,"Q_Id":44072308,"Users Score":0,"Answer":"Here are some tips:\n\nFollow a directory structure similar to this: appname\/%Y\/%m\/%d.\nUse AWS S3, or another storage service, for your media and static files.\nCompress files to reduce size. \nUse whitenoise, or a similar package, to serve static files in production.\n\nNote: These tips are not solely for media, but also static files.","Q_Score":0,"Tags":"python,django,file,optimization,deployment","A_Id":44072397,"CreationDate":"2017-05-19T14:12:00.000","Title":"What are important tricks about saving heavy media files in production?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Say, I have a list full of html links that looks something like this:\nhttps:\/\/www.nytimes.com\/2017\/05\/19\/realestate\/they-can-afford-to-buy-but-they-would-rather-rent.html\nWhen I run a script in Python 3.6 Idle, I get the list as an output in Python 3.6 shell; however, they are not clickable.  Is there a simple way to make them clickable in the shell? \nI've googled around but I can't seem to find anything involving the Python shell.\nThank you.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":6771,"Q_Id":44078888,"Users Score":0,"Answer":"Sorry. No. IDLE is the most basic of editors and the shell is just that.","Q_Score":0,"Tags":"python,shell,clickable","A_Id":63865129,"CreationDate":"2017-05-19T20:58:00.000","Title":"Clickable html links in Python 3.6 shell?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"After several weeks looking for some information here and google, I've decided to post it here to see if anyone with the same problem can raise me a hand.\nI have a java application developed in Eclipse Ganymede using tomcat to connect with my local database. The problem is that I want to send a simple message (\"Hello World\") to a Kafka Topic published on a public server. I've imported the libraries and developed the Kafka function but something happens when I run in debug mode. I have no issues or visible errors when compiling, but when I run the application and push the button to raise this function it stops in KafkaProducer function because there is NoClassDefFoundError kafka.producer..... It seems like it is not finding the library properly, but I have seen that it is in the build path properly imported.\nI am not sure if the problem is with Kafka and the compatibility with Eclipse or Java SDK (3.6), it could be?. Anyone knows the minimum required version of Java for Kafka?\nAlso, I have found that with Kafka is really used Scala but I want to know if I can use this Eclipse IDE version for not change this.\nAnother solution that I found is to use a Python script called from the Java application, but I have no way to call it from there since I follow several tutorials but then nothing works, but I have to continue on this because it seems an easier option. I have developed the .py script and works with the Kafka server, now I have to found the solution to exchange variables from Java and Python. If anyone knows any good tutorial for this, please, let me know.\nAfter this resume of my days and after hitting my head with the walls, maybe someone has found this error previously and can help me to find the solution, I really appreciate it and sorry for the long history.","AnswerCount":3,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":370,"Q_Id":44087849,"Users Score":0,"Answer":"Please include the Kafka client library within the WAR file of the Java application which you are deploying to Tomcat","Q_Score":0,"Tags":"python,eclipse,apache-kafka,kafka-producer-api","A_Id":44092800,"CreationDate":"2017-05-20T15:44:00.000","Title":"Send message to a kafka topic using java","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"After several weeks looking for some information here and google, I've decided to post it here to see if anyone with the same problem can raise me a hand.\nI have a java application developed in Eclipse Ganymede using tomcat to connect with my local database. The problem is that I want to send a simple message (\"Hello World\") to a Kafka Topic published on a public server. I've imported the libraries and developed the Kafka function but something happens when I run in debug mode. I have no issues or visible errors when compiling, but when I run the application and push the button to raise this function it stops in KafkaProducer function because there is NoClassDefFoundError kafka.producer..... It seems like it is not finding the library properly, but I have seen that it is in the build path properly imported.\nI am not sure if the problem is with Kafka and the compatibility with Eclipse or Java SDK (3.6), it could be?. Anyone knows the minimum required version of Java for Kafka?\nAlso, I have found that with Kafka is really used Scala but I want to know if I can use this Eclipse IDE version for not change this.\nAnother solution that I found is to use a Python script called from the Java application, but I have no way to call it from there since I follow several tutorials but then nothing works, but I have to continue on this because it seems an easier option. I have developed the .py script and works with the Kafka server, now I have to found the solution to exchange variables from Java and Python. If anyone knows any good tutorial for this, please, let me know.\nAfter this resume of my days and after hitting my head with the walls, maybe someone has found this error previously and can help me to find the solution, I really appreciate it and sorry for the long history.","AnswerCount":3,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":370,"Q_Id":44087849,"Users Score":0,"Answer":"Please use org.apache.kafka.clients.producer.KafkaProducer rather than kafka.producer.Producer (which is the old client API) and make sure you have the Kafka client library on the classpath. The client library is entirely in Java. It's the old API that's written in scala, as is the server-side code. You don't need to import the server library in your code or add it to the classpath if you use the new client API.","Q_Score":0,"Tags":"python,eclipse,apache-kafka,kafka-producer-api","A_Id":44109016,"CreationDate":"2017-05-20T15:44:00.000","Title":"Send message to a kafka topic using java","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"After several weeks looking for some information here and google, I've decided to post it here to see if anyone with the same problem can raise me a hand.\nI have a java application developed in Eclipse Ganymede using tomcat to connect with my local database. The problem is that I want to send a simple message (\"Hello World\") to a Kafka Topic published on a public server. I've imported the libraries and developed the Kafka function but something happens when I run in debug mode. I have no issues or visible errors when compiling, but when I run the application and push the button to raise this function it stops in KafkaProducer function because there is NoClassDefFoundError kafka.producer..... It seems like it is not finding the library properly, but I have seen that it is in the build path properly imported.\nI am not sure if the problem is with Kafka and the compatibility with Eclipse or Java SDK (3.6), it could be?. Anyone knows the minimum required version of Java for Kafka?\nAlso, I have found that with Kafka is really used Scala but I want to know if I can use this Eclipse IDE version for not change this.\nAnother solution that I found is to use a Python script called from the Java application, but I have no way to call it from there since I follow several tutorials but then nothing works, but I have to continue on this because it seems an easier option. I have developed the .py script and works with the Kafka server, now I have to found the solution to exchange variables from Java and Python. If anyone knows any good tutorial for this, please, let me know.\nAfter this resume of my days and after hitting my head with the walls, maybe someone has found this error previously and can help me to find the solution, I really appreciate it and sorry for the long history.","AnswerCount":3,"Available Count":3,"Score":1.2,"is_accepted":true,"ViewCount":370,"Q_Id":44087849,"Users Score":0,"Answer":"At the end the problem was related with the library that was not well added. I had to add it in the build.xml file, importing here the library. Maybe this is useful for the people who use an old Eclipse version.\nSo now it finds the library but I have to update Java version, other matter. So it is solved","Q_Score":0,"Tags":"python,eclipse,apache-kafka,kafka-producer-api","A_Id":44161576,"CreationDate":"2017-05-20T15:44:00.000","Title":"Send message to a kafka topic using java","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've built a small telegram bot using python-telegram-bot.\nWhen a conversation is started,I add a periodical job to the job queue and then message back to the user every X minutes.\nProblem is when my bot goes offline (maintenance, failures, etc), the jobqueue is lost and clients do not receive updates anymore unless they send \/start again\nI could maybe store all chat_ids in a persistent queue and restore them at startup but how do I send a message without responding to an update ?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":778,"Q_Id":44090457,"Users Score":0,"Answer":"you have lots of options. at first you need to store all chat_ids. you can do it in database or simple text file.\nthen you need a trigger in order to start sending messages. I'm not familiar with your technology but i just create simple service in order to do it.","Q_Score":1,"Tags":"telegram-bot,python-telegram-bot","A_Id":44094915,"CreationDate":"2017-05-20T20:19:00.000","Title":"Restoring job-queue between telegram-bot restarts","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am building a web application that allows users to login and upload data files that would eventually be used to perform data visualisation and data mining features - Imagine a SAS EG\/Orange equivalent on the web.\nWhat are the best practices to store these files (in a database or on file) to facilitate efficient retrieval and processing of the data and the pros and cons of each method?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":299,"Q_Id":44094933,"Users Score":0,"Answer":"This depends on what functionality you can offer.\nMany very interesting data mining tools will read raw data files only, so storing the data in a database does not help you anything.\nBut then you won't want to run them \"on the web\" anyway, as they easily eat all your resources.\nEither way, first get your requirements straight and explicit, then settle on the analysis tools, then decide on the storage backend depending on what the tools can use.","Q_Score":0,"Tags":"python,django,database,data-visualization,data-mining","A_Id":44206133,"CreationDate":"2017-05-21T08:50:00.000","Title":"Storing data files on Django application","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Hello I did a hello world python application in local host and then I deployed it to the google app engine using google application launcher but I don't know where access it inside the google app engine from inside the dashboard.And is there any way through which I can edit the hello world once its uploaded to app engine.\nI went through their tutorial but I am stuck right here .","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":22,"Q_Id":44097436,"Users Score":1,"Answer":"You cannot to my knowledge edit the codebase once it's uploaded - it can only be modified locally. If you want to access app engine have a look at appengine.google.com . If you look under \"Versions\" you'll see some the links to the version(s) of your app.","Q_Score":0,"Tags":"python,google-app-engine","A_Id":44226486,"CreationDate":"2017-05-21T13:25:00.000","Title":"[Python ]google app engine deploying the file to server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Slighty new to django..\nI got this error when attempting to do \"django-admin makemigrations\"\n\ndjango.core.exceptions.ImproperlyConfigured: Requested setting\n  DEFAULT_INDEX_TABLESPACE, but settings are not configured. You must\n  either define the environment variable DJANGO_SETTINGS_MODULE or call\n  settings.configure() before accessing settings.\n\nAlso get this error when attempting to load my home page:\n\nOperationalError at \/home\/ no such table: home_post","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":2203,"Q_Id":44101319,"Users Score":1,"Answer":"You should use manage.py, not django-admin, to run management commands inside your project.","Q_Score":1,"Tags":"python,django,sqlite","A_Id":44101694,"CreationDate":"2017-05-21T20:12:00.000","Title":"Requested setting DEFAULT_INDEX_TABLESPACE, but settings are not configured","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Things being used:\n\nSupervisor to run uwsgi\nuwsgi to bring up my Django non-rel 1.6 based ML app (Django Upgrade in process)\n\nI am using Uwsgi to start my Django ML based app. \nBut somehow as it has to load a lot of binaries for initialization, it takes about 20-30 seconds for supervisor to restart and load new code. \nHow can I reduce this time?\nor is there any other way to run the Django app so as to reload quickly when code changes?   With ZERO downtime? as Nginx will start throwing 5xx if it can't connect to Django.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":614,"Q_Id":44109334,"Users Score":0,"Answer":"You can use Blue-Green deployment approach.\nIn this approach, there are two identical server: one is Blue, other is Green.\nAt any time, only one of the environments is live, with the live environment serving all production traffic.As you prepare a new release of your software you do your final stage of testing in the green environment. Once the software is working in the green environment, you switch the router so that all incoming requests go to the green environment - the blue one is now idle.","Q_Score":3,"Tags":"python,django","A_Id":44109481,"CreationDate":"2017-05-22T09:26:00.000","Title":"Zero Downtime Code Update for Django App","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was running Django 1.11 with Python 3.5 and I decided to upgrade to Python 3.6.\nMost things worked well, but I am having issues connection to AWS S3. I know that they have a new boto version boto3 and that django-storages is a little outdated, so now there is django-storages-redux.\nI've been trying multiple combinations of boto\/boto3 and django-storages-redux\/django-storages to see if it works. But I'm getting a lot of erros, from SSL connection failing to the whole website being offline due to server errors. The newest is my website throwing a 400 Bad Request to all urls.\nMy app does run on Python 3.5, so I'm confident that the issue is around collectstatic and S3.\nIs there anybody here who made a similar update work and tell me what configuration was used?\nThanks a lot!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":149,"Q_Id":44121989,"Users Score":-1,"Answer":"Found the issue.\nDjango-storages-redux was temporarily replacing django-storages since it's development had been interrupted.\nNow the django-storages team restarted to support it.\nThat means that the correct configuration to use is: django-storages + boto3","Q_Score":0,"Tags":"django,python-3.x,amazon-s3,boto","A_Id":44122528,"CreationDate":"2017-05-22T20:53:00.000","Title":"Django: Upgrading to python3.6 with Amazon S3","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a web service that accepts post requests. A post request specifies a specific job to be executed in the background, that modifies a database used for later analysis. The sender of the request does not care about the result, and only needs to receive a 202 acknowledgment from the web service. \nHow it was implemented so far:\nFlask Web service will get the http request , and add the necessary parameters to the task queue (rq workers), and return back an acknowledgement. A separate rq worker process listens on the queue and processes the job.\nWe have now switched to aiohttp, and realized that the web service can now schedule the actual job request in its own event loop, by using the aiohttp.ensure_future() method.\nThis however blurs the lines between the web-server and the task queue. On the positive side, it eliminates the need of having to manage the rq workers.\nIs this considered a good practice?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":381,"Q_Id":44139153,"Users Score":0,"Answer":"If your tasks are not CPU heavy - yes, it is good practice.\nBut if so, then you need to move them to separate service or use run_in_executor(). In other case your aiohttp event loop will be blocked by this tasks and server will not be able to accept new requests.","Q_Score":2,"Tags":"python-3.x,celery,aiohttp","A_Id":51969202,"CreationDate":"2017-05-23T15:30:00.000","Title":"Background processes in the aiohttp event loop","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have pretty simple model. User defines url and database name for his own Postgres server. My django backend fetches some info from client DB to make some calculations, analytics and draw some graphs.\nHow to handle connections? Create new one when client opens a page, or keep connections alive all the time?(about 250-300 possible clients)\nCan I use Django ORM or smth like SQLAlchemy? Or even psycopg library?\nDoes anyone tackle such a problem before?\nThanks","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":77,"Q_Id":44139772,"Users Score":0,"Answer":"In your case, I would rather go with Django internal implementation and follow Django ORM as you will not need to worry about handling connection and different exceptions that may arise during your own implementation of DAO model in your code.\nAs per your requirement, you need to access user database, there still exists overhead for individual users to create db and setup something to connect with your codebase. So, I thinking sticking with Django will be more profound.","Q_Score":0,"Tags":"python,django,database,postgresql,orm","A_Id":44139838,"CreationDate":"2017-05-23T16:00:00.000","Title":"Handle connections to user defined DB in Django","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to know if django creates a new instance of the view (or the whole app) on each request.\nIm not sure if this fit too but would love to know if a request will have to wait for a current one to complete before the incoming starts?\nThanks in advance","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":59,"Q_Id":44156976,"Users Score":1,"Answer":"I want to know if django creates a new instance of the view (or the whole app) on each request.\n\nNope - unless you serve your project with plain cgi of course but that would be a very very strange choice.\n\nIm not sure if this fit too but would love to know if a request will have to wait for a current one to complete before the incoming starts?\n\nDepends on how many worker processes \/ threads you use to serve your project. A single worker process\/thread will handle a single request at a time obviously.","Q_Score":0,"Tags":"python,django,server","A_Id":44157132,"CreationDate":"2017-05-24T11:24:00.000","Title":"Django handling request","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using Django 1.2 template tags over webapp framework in Google App engine. I intend to migrate over to Webapp2.  I was looking for a way to this in webapp2, but did not find a template engine for webapp2. So, should I continue with webapp's template engine or use pure Django template engine.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":109,"Q_Id":44158025,"Users Score":2,"Answer":"Many people use Jinja templates with webapp2 in GAE, but you can also use Django templates.  The two template systems are very similar so it is fairly easy to switch between the two.\nThe template system that you use is quite independent of webapp2.  It works like this:\n\nRender your template to get a string representation of your HTML page\nTransmit the string with webapp2\n\nFeel free to use Jinja, Django, or any other templating system.  Webapp2 doesn't provide templates because it is not part of its job.","Q_Score":0,"Tags":"python,google-app-engine,django-templates,webapp2","A_Id":44158851,"CreationDate":"2017-05-24T12:08:00.000","Title":"Is there any way to use Django templates in Webapp2 framework in Google App Engine","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I recently did an inspectdb of our old database which is on MySQL. We want to move to postgre. now we want the inspection to migrate to a different schema is there a migrate command to achieve this? so different apps shall use different schemas in the same database","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":204,"Q_Id":44161614,"Users Score":0,"Answer":"so simple!\npython manage.py migrate \"app_name\"","Q_Score":0,"Tags":"postgresql,python-3.5,django-migrations,django-1.8,django-postgresql","A_Id":47838958,"CreationDate":"2017-05-24T14:39:00.000","Title":"how to specify an app to migrate to a schema django","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a table which I am working on and it contains 11 million rows there abouts... I need to run a migration on this table but since Django trys to store it all in cache I run out of ram or disk space which ever comes first and it comes to abrupt halt.\nI'm curious to know if anyone has faced this issue and has come up with a solution to essentially \"paginate\" migrations maybe into blocks of 10-20k rows at a time?\nJust to give a bit of background I am using Django 1.10 and Postgres 9.4 and I want to keep this automated still if possible (which I still think it can be)\nThanks\nSam","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":995,"Q_Id":44167386,"Users Score":5,"Answer":"The issue comes from a Postgresql which rewrites each row on adding a new column (field).\nWhat you would need to do is to write your own data migration in the following way:\n\nAdd a new column with null=True. In this case data will not be\nrewritten and migration will finish pretty fast. \nMigrate it \nAdd a default value \nMigrate it again.\n\nThat is basically a simple pattern on how to deal with adding a new row in a huge postgres database.","Q_Score":5,"Tags":"python,django,postgresql,django-migrations","A_Id":44167568,"CreationDate":"2017-05-24T19:55:00.000","Title":"Django migration 11 million rows, need to break it down","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a huge database which includes a \"posted time\" field.\nThis field contains values such as: 2 days ago, 3 months ago, 5 minutes ago...\nI can sort it the hard way which involves looking first at the second parameter (day, month, minutes) and then looking at the first parameter which is the number.\nI was wondering if there is a better (easier) way?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":100,"Q_Id":44180835,"Users Score":1,"Answer":"These fuzzy values \"x y's ago\" are clearly display values calculated from some original source data.  Are you sourcing these data from some API?\nYou should instead try to source the original data behind these display values. Probably the \"huge database\" you are sourcing these records from can be queried in a way that returns absolute values for dates, rather than these fuzzy ones.\n(as an aside, I find the current trend of using so-called human-friendly fuzzy date stamps to be extremely annoying, especially when you can't turn them off. Not only does it impact screen scraping applications as this appears to be, but it's really a hindrance for time-critical data such as ticketing systems with date-stamped notes. I look forward to seeing this UI trend abate).","Q_Score":2,"Tags":"python","A_Id":44181046,"CreationDate":"2017-05-25T12:39:00.000","Title":"Sort dates in Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to spawn a mapreduce job using the mrjob library from AWS Lambda. The job takes longer than the 5 minute Lambda time limit, so I want to execute a remote job. Using the paramiko package, I ssh'd onto the server and ran a nohup command to spawn a background job, but this still waits until the end of job. Is there anyway to do this with Lambda?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":441,"Q_Id":44184942,"Users Score":0,"Answer":"Instead of using SSH I've solved this before by pushing a message onto a SQS queue that a process on the server monitors. This is much simpler to implement and avoids needing to keep credentials in the lambda function or place it in a VPC.","Q_Score":0,"Tags":"python,amazon-web-services,aws-lambda,paramiko,mrjob","A_Id":44213779,"CreationDate":"2017-05-25T16:02:00.000","Title":"How to execute a job on a server on Lambda without waiting for the response?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How can I catch a request that is forbidden by robots.txt in scrapy? Usually this seems to get ignored automatically, i.e. nothing in the output, so I really can't tell what happens to those urls. Ideally if crawling a url leads to this forbidden by robots.txt error, I'd like to output a record like {'url': url, 'status': 'forbidden by robots.txt'}. How can I do that? \nNew to scrapy. Appreciate any help.","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":1197,"Q_Id":44187774,"Users Score":2,"Answer":"Go to settings.py in the project folder and change ROBOTSTXT_OBEY = True to ROBOTSTXT_OBEY = False.","Q_Score":1,"Tags":"python,scrapy","A_Id":45843257,"CreationDate":"2017-05-25T18:47:00.000","Title":"How to catch forbidden by robots.txt?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it considered against Django \"best practices\" to place templates, views, or models inside the Django config app? (The same app with settings.py)\nTemplates are probably a \"no\" because template files in a templates directory under the config app will not be found by default, I had to add a django.template.loaders.filesystem.Loader to load them.\nThank you for any advice.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":24,"Q_Id":44192062,"Users Score":0,"Answer":"Its normally a good practice to leave your project directory as such and keep the apps in their own separate directory and have them defined in the settings.py. This will make your project much more organised and easy to maintain.","Q_Score":0,"Tags":"python,django","A_Id":44192368,"CreationDate":"2017-05-26T01:08:00.000","Title":"Should templates, views, and models go in the Django config app?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"When the content-type of the server is 'Content-Type:text\/html', requests.get() returns improperly encoded data.\nHowever, if we have the content type explicitly as 'Content-Type:text\/html; charset=utf-8', it returns properly encoded data.\nAlso, when we use urllib.urlopen(), it returns properly encoded data. \nHas anyone noticed this before? Why does requests.get() behave like this?","AnswerCount":4,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":113907,"Q_Id":44203397,"Users Score":20,"Answer":"The default assumed content encoding for text\/html is ISO-8859-1 aka Latin-1 :( See RFC-2854. UTF-8 was too young to become the default, it was born in 1993, about the same time as HTML and HTTP.\nUse .content to access the byte stream, or .text to access the decoded Unicode stream. If the HTTP server does not care about the correct encoding, the value of .text may be off.","Q_Score":56,"Tags":"python,utf-8,python-requests","A_Id":44203633,"CreationDate":"2017-05-26T13:54:00.000","Title":"python requests.get() returns improperly decoded text instead of UTF-8?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"in my app I have a mixin that defines 2 fields like start_date and end_date. I've added this mixin to all table declarations which require these fields. \nI've also defined a function that returns filters (conditions) to test a timestamp (e.g. now) to be >= start_date and < end_date. Currently I'm manually adding these filters whenever I need to query a table with these fields.\nHowever sometimes me or my colleagues forget to add the filters, and I wonder whether it is possible to automatically extend any query on such a table. Like e.g. an additional function in the mixin that is invoked by SQLalchemy whenever it \"compiles\" the statement. I'm using 'compile' only as an example here, actually I don't know when or how to best do that.\nAny idea how to achieve this?\nIn case it works for SELECT, does it also work for INSERT and UPDATE?\nthanks a lot for your help\nJuergen","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":182,"Q_Id":44207726,"Users Score":0,"Answer":"I tried extending Query but had a hard time. Eventually (and unfortunately) I moved back to my previous approach of little helper functions returning filters and applying them to queries.\nI still wish I would find an approach that automatically adds certain filters if a table (Base) has certain columns.\nJuergen","Q_Score":1,"Tags":"python,sqlalchemy","A_Id":44395701,"CreationDate":"2017-05-26T18:06:00.000","Title":"sqlalchemy automatically extend query or update or insert upon table definition","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm getting parameters through GET or POST.\nOn the book I'm reading,\nthere's \nWord = '%s' % self.request.POST['word']\nI wonder whether there's a specific reason for that.\nI mean why not like this just simply?\nWord = self.request.POST['word']","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":60,"Q_Id":44214153,"Users Score":0,"Answer":"I think there is no difference between the two line.","Q_Score":0,"Tags":"django,python-3.x","A_Id":44214492,"CreationDate":"2017-05-27T07:23:00.000","Title":"Django python, differences between self.request and '%s' % self.request","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In a Django website of mine, I allow usernames that are alphanumeric, and\/or contain @ _ . + -. Moreover, whitespaces are allowed too. I've written a simple regex to ensure this: '^[\\w\\s.@+-]+$'. \nIt might be an obvious question, but how do I capture characters that do not pass regex validation? I want to display such characters in a tool tip to my users.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":26,"Q_Id":44217644,"Users Score":1,"Answer":"Using the carat inside of square brackets (e.g. [^...]) makes it an inverse. So, for example, [A-Za-z0-9_] would match alpha numerics and underscores, whereas [^A-Za-z0-9_] would match anything that is not alpha numerics or underscores. In your case, the regex you seem to want is r'^[^\\w\\s\\.\\@\\+\\-]+$'.","Q_Score":0,"Tags":"python,regex,django","A_Id":44217707,"CreationDate":"2017-05-27T13:50:00.000","Title":"Catching characters that do not pass regex validation","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Selenium in Python for a project and I was wondering if there was a way to record or stream audio that is being played in the browser. Essentially I want to use selenium to get the audio and pass it to my application in Python so that I can process it. \nIs there a way to do this in Selenium, or using another Python package? \nIdeally I would want to be able to get any audio playing in the browser window irregardless of the source.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1354,"Q_Id":44221542,"Users Score":0,"Answer":"There is no way to do it with just selenium, but it will be not so hard to implement it with python, just search python module or external program which suite your purpose","Q_Score":5,"Tags":"javascript,python,html,selenium,audio","A_Id":44233382,"CreationDate":"2017-05-27T20:57:00.000","Title":"Selenium, streaming audio from browser","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Could I change \"updated\" field for Jira issue without changing any others fields for the issue?\nI want to update this filed let's say in the \"silent mode\" without changing values in the other fields.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":38,"Q_Id":44225170,"Users Score":1,"Answer":"without having used jira-python, i guess you can't. That would break the meaning of the updated field, when setting \"updated\" to a new value, although there hasn't been any update. In which situation would that make sense?","Q_Score":0,"Tags":"python,jira","A_Id":44225250,"CreationDate":"2017-05-28T08:14:00.000","Title":"Python + Jira (lib) How to change \"updated\" fileld","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to upload video into S3 using AWS lambda function. This video is not available in my local computer. I have 'download URL'. I don't want to download it into my local computer and upload it into S3. I am looking for a solution to directly put this video file into S3 using lambda function. If I use buffer or streaming, I will consume lots of memory. Is there a better efficient solution for this?\nI really appreciate your help.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":7999,"Q_Id":44233777,"Users Score":2,"Answer":"You could certainly write an AWS Lambda function that would:\n\nDownload the file from the URL and store it in \/tmp\nUpload to Amazon S3 using the AWS S3 SDK\n\nIt would be easiest to download the complete file rather than attempting to stream it in 'bits'. However, please note that there is a limit of 500MB of disk space available for storing data. If your download is larger than 500MB, you'll need to do some creative programming to download portions of it and then upload it as a multi-part upload.\nAs for how to download it, use whatever library you prefer for download a web file.","Q_Score":7,"Tags":"python,amazon-web-services,amazon-s3,aws-lambda","A_Id":44234884,"CreationDate":"2017-05-29T02:09:00.000","Title":"Use AWS lambda to upload video into S3 with download URL","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am developing a Django project for which I wrote some non-web related libraries.\nMy directory structure looks something like this:\nMain folder\n\nTheorem prover\n\n\nhere are the things I want to import\n\nweb\n\n\napp\n\n\nhere's where I want to import things from\n\n\n\nThe place where I'm running the app is the web\/ folder. What would be the proper way of doing this?","AnswerCount":3,"Available Count":1,"Score":0.0665680765,"is_accepted":false,"ViewCount":738,"Q_Id":44243446,"Users Score":1,"Answer":"Make sure, that your settings.py which located at the project root directory, has sys.path.append(os.path.dirname(os.path.abspath(__file__)))\nfrom web -> app -> here's where I want to import things from:\nimport Theorem_prover.here_are_the_things_I_want_to_import","Q_Score":1,"Tags":"python,django","A_Id":44285373,"CreationDate":"2017-05-29T13:15:00.000","Title":"Python import from beyond top-level package","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Im on Level 2, part 2: (Level 2, 50%)\nAfter I submitted challenge (java) I got nothing - the time stops and status doesn't update.\nLogout\/Clear cash - doesn't work, all looks like I need request the new challenge but I did it twice! And it doesn't work at all!\nI posted bug though Feedback command from foo.bar but who knows where it goes. \nWho knows where I can find foo.bar bug tracker? To understand what is going on.\nAlso I will appreciate any help and advice.\nThanks!\ngoogle-chrome, macos, foobar version 53-17-g6bfce4dd-beta (2017-03-21-22:12+0000)","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":405,"Q_Id":44252108,"Users Score":0,"Answer":"After 2 weeks of waiting for any messages from support or new build I have decided to request a new challenge (3rd one) and vuala - the system accepted my solution and promoted me to the 3rd level.","Q_Score":1,"Tags":"java,python,google-chrome","A_Id":44575770,"CreationDate":"2017-05-30T01:25:00.000","Title":"Google Foobar Bug chahallenge resets after submit","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a situation where if the user visits any route on my Pyramid application I would like to serve them one particular view. Basically \"force\" them to a single page. A redirect would be fine too.\nIs there something in Pyramid to achieve this?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":52,"Q_Id":44256443,"Users Score":0,"Answer":"If you can manage to view this as a permission\/security problem then you can deal with it by adding appropriate permissions\/ACLs to your application and then handling the issue in a forbidden view by likely returning a redirect.","Q_Score":0,"Tags":"python,web,pyramid","A_Id":44275394,"CreationDate":"2017-05-30T07:46:00.000","Title":"Changing view or route after the request has been started in Pyramid","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Hi, I declared variables in config and iam using in below test case. the variables are not passing. iam not able to figure out the actual issue.\n\nconfig:\n\n\nvariable_binds: {'user_id': 'ravitej', 'pass': 'password', 'auth': 'plain'}\n\ntest:\n\n\nname:\"login success\"\nurl: \"\/api\/login\"\nmethod: \"POST\"\nbody: '{\"username\": \"$user_id\", \"password\": \"$pass\", \"authtype\": \"$auth\"}'\nheaders: {Content-Type: application\/json}\nexpected_status: [200]\ngroup: \"User\"\n\n\nIn this below case: I'm running 1st test set and I'm getting some auth_token in response this auth_token is saved to auth_key to use in another test set, but this auth_key is not passing to the 2nd test set. it was passing an empty variable. I tried all possible ways wich are posted in Github still I am getting the same problem\n\ntest:\n\nname: \"Registration\"\nurl: \"\/api\/register\"\nmethod: \"POST\"\nbody: '{\"device_id\": \"0080\", \"device_key\": \"imAck\", \"device_name\": \"teja\", \"device_description\": \"Added By Ravi\", \"project_tag\": \"MYSTQ-16\", \"attributes\": \"{}\"}'\nheaders: {Content-Type: application\/json}\nexpected_status: [200]\ngroup: \"Register\"\nextract_binds:\n     - 'auth_key': {'jsonpath_mini': 'auth_token'}\n\ntest:\n\nname: \"Status\"\nurl: \"\/api\/status\"\nmethod: \"POST\"\nbody: '{\"attributes\": {\"num_ports\": \"2\", \"model\": \"Phillips\", \"firmware_ver\": \"8.0.1\", \"ipaddress\": \"192.168.0.0\", \"rssi\": \"Not Available\"}}'\nheaders: {Content-Type: application\/json, auth_token: \"$auth_key\"}\nexpected_status: [200]\ngroup: \"Status\"","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":202,"Q_Id":44260604,"Users Score":0,"Answer":"need to use template headers, like\nheaders: {template: {Content-Type: application\/json, auth_token: \"$auth_key\"}}\nExample: \nheaders: {template: {'$headername': '$headervalue', '$cache': '$cachevalue'}}\nits worked fine now","Q_Score":1,"Tags":"python,rest,pyresttest","A_Id":44262032,"CreationDate":"2017-05-30T11:09:00.000","Title":"Variables are not passing from one test set to another?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I started to learn Django, I don't know python very well, so please forgive me, if the question is quite stupid). \nfrom . import views\nwhat is \".\" in this statement? Module's name?","AnswerCount":4,"Available Count":3,"Score":0.049958375,"is_accepted":false,"ViewCount":15432,"Q_Id":44262586,"Users Score":1,"Answer":"It means from the current directory import views.py module","Q_Score":8,"Tags":"python,django,python-import","A_Id":44262726,"CreationDate":"2017-05-30T12:41:00.000","Title":"Django tutorial. from . import views","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I started to learn Django, I don't know python very well, so please forgive me, if the question is quite stupid). \nfrom . import views\nwhat is \".\" in this statement? Module's name?","AnswerCount":4,"Available Count":3,"Score":0.049958375,"is_accepted":false,"ViewCount":15432,"Q_Id":44262586,"Users Score":1,"Answer":"while one dot means the current directory if you want upper dicrectory then use double dot just for your referencce","Q_Score":8,"Tags":"python,django,python-import","A_Id":44263397,"CreationDate":"2017-05-30T12:41:00.000","Title":"Django tutorial. from . import views","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I started to learn Django, I don't know python very well, so please forgive me, if the question is quite stupid). \nfrom . import views\nwhat is \".\" in this statement? Module's name?","AnswerCount":4,"Available Count":3,"Score":1.2,"is_accepted":true,"ViewCount":15432,"Q_Id":44262586,"Users Score":6,"Answer":"The single dot is a convention from command line applications. It means the current directory. In terms of Django it stands for the directory\/module the current file is on.","Q_Score":8,"Tags":"python,django,python-import","A_Id":44262623,"CreationDate":"2017-05-30T12:41:00.000","Title":"Django tutorial. from . import views","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have different settings for different environments for my application, such as local, dev, stage, production. So, when I run my apps, say, locally, I pass the settings as the parameter to manage.py, e.g. python3 manage.py runserver 0.0.0.0:8080 --settings=myapp.settings.local, and indeed all my settings are correctly initialised, e.g. DEBUG is True as it is set in my settings file, and not False as it is in defaultsettings.py.\nHowever, when I try to run tests with python3 manage.py test --settings=myapp.settings.local, the value of DEBUG is set to false, that is it is loaded from defaultsettings.py. Why does that happen and how can I fix this?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":293,"Q_Id":44265851,"Users Score":0,"Answer":"Make sure that in the test you import the settings like this:\nfrom django.conf import settings","Q_Score":0,"Tags":"python,django,settings","A_Id":44270896,"CreationDate":"2017-05-30T15:08:00.000","Title":"Django settings are not loaded when running tests","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I user next line in my template: {{ description|linebreaks }}\nHow to add the same class to all <p> elements which will be generate?","AnswerCount":2,"Available Count":1,"Score":0.2913126125,"is_accepted":false,"ViewCount":153,"Q_Id":44269711,"Users Score":3,"Answer":"You could do this by modifying template processors, but if you want to add this to all <p> elements which are generated why not just use CSS?","Q_Score":1,"Tags":"python,django","A_Id":44269738,"CreationDate":"2017-05-30T18:46:00.000","Title":"How add class to p elements which generated by linebreaks?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working on a project and I just wanted to know what route (If I'm not going down the correct route) I should go down in order to successfully complete this project. \nFerry Time: This application uses boat coordinates and ETA algorithms to determine when a boat will be approaching a certain destination.\nNow, I've worked up a prototype that works, but not the way I want it to. In order for my ETA's to show up on my website accurately, I have a python script that runs every minute to webscrape these coordinates from a specific site, do an algorithm, and spit out an ETA. The ETA is then sent to my database, where I display it on my website using PHP and SQL. \nThe ETA's only update as long as this script is running (I literally run the script on Eclipse and just leave it there)\nNow my question: Is there a way I can avoid running the script? Almost like an API. Or to not use a database at all?\nThanks !","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":71,"Q_Id":44270585,"Users Score":1,"Answer":"If the result of your algorithm only depends on the LAST scrape and not a history of several scrapes, then you could just scrape \"on demand\" and deploy your algo as an AWS lambda function.","Q_Score":0,"Tags":"php,python,api,server","A_Id":44271429,"CreationDate":"2017-05-30T19:38:00.000","Title":"Project using Python Webscraping","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working on a project and I just wanted to know what route (If I'm not going down the correct route) I should go down in order to successfully complete this project. \nFerry Time: This application uses boat coordinates and ETA algorithms to determine when a boat will be approaching a certain destination.\nNow, I've worked up a prototype that works, but not the way I want it to. In order for my ETA's to show up on my website accurately, I have a python script that runs every minute to webscrape these coordinates from a specific site, do an algorithm, and spit out an ETA. The ETA is then sent to my database, where I display it on my website using PHP and SQL. \nThe ETA's only update as long as this script is running (I literally run the script on Eclipse and just leave it there)\nNow my question: Is there a way I can avoid running the script? Almost like an API. Or to not use a database at all?\nThanks !","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":71,"Q_Id":44270585,"Users Score":0,"Answer":"Even if they had an API you'd still need to run something against it to get the results. If you don't want to leave your IDE open you could use cron to call your script.","Q_Score":0,"Tags":"php,python,api,server","A_Id":44270817,"CreationDate":"2017-05-30T19:38:00.000","Title":"Project using Python Webscraping","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am currently using a angular4 projected generated by angular-CLI to create the project structure and I was able to serve it using ng-serve and develop and see changes. Now I would like to move it to being hosted on my own backend, using google app engine and webApp2 and run it using dev_appserver.py app.yaml. Currently the only way I can get it to work is by doing an ng-build and serving the files out of the dist folder. I would like to make it so I can easily make changes but not have to wait for it to rebuild each time.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":468,"Q_Id":44271174,"Users Score":1,"Answer":"You can use enviroment on angular in order to point you python rest service and another enviroment to production.\nExample:\nenviroment.ts\n\nexport const environment = {\n  production: false,\n  urlServices: 'http:\/\/190.52.112.41:8075'\n};\n\nenviroment.prod.ts\n\nexport const environment = {\n  production: true,\n  urlServices: 'http:\/\/localhost:8080'\n};\n\nIn this way , you dont need to compile to test you aplication because angular always will be pointed to you python app.","Q_Score":0,"Tags":"python,angular,google-app-engine,angular-cli,google-app-engine-python","A_Id":44271728,"CreationDate":"2017-05-30T20:17:00.000","Title":"Angular4 and WebApp2 on google App engine","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have django form with name and email address as a form field in forms.py file.\nI am implementing that form in HTML Page with the help of {form.as_p}.\nNow I have JavaScript inside that same HTML page with...\n{% block javascript %}\n<script>\n<\/script>\n{% endblock %}\nNow How can I access both form variable inside this script tag. I want to validate data at client-side and than wants to send at server.\nWill getElementById() method works? and If so what I need to write for access my form variables or any other good alternative.\nThanks","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2842,"Q_Id":44276329,"Users Score":3,"Answer":"Yes, its possible. Django gives an id in format id_fieldname to each field you define in your Django form.\nE.g. For name field, id in HTML will be id_name and For email_address field ,id in HTML will be id_email_address\nNow you can simply use getElementById() in your JS with these ID for validation.","Q_Score":0,"Tags":"javascript,jquery,python,django-forms,django-templates","A_Id":44276395,"CreationDate":"2017-05-31T05:24:00.000","Title":"accessing django form variable in javascript which is inside html page","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I managed to run a scrapy program in Ubuntu terminal. However, I cannot use Ctrl+Z and bg command to let it run in the background. It will close the spider connection everytime I press Ctrl + Z.\nIs there any workaround or ways to solve the issue?","AnswerCount":3,"Available Count":2,"Score":0.1325487884,"is_accepted":false,"ViewCount":2613,"Q_Id":44291111,"Users Score":2,"Answer":"If you run your spider with scrapy crawl:\n\nIf you want to keep the logs: scrapy crawl my_spider > \/path\/to\/logfile.txt 2>&1 &\nIf you want to dismiss the logs: scrapy crawl my_spider > \/dev\/null 2>&1 &","Q_Score":5,"Tags":"python,python-3.x,ubuntu,scrapy","A_Id":44655448,"CreationDate":"2017-05-31T17:22:00.000","Title":"Run scrapy in background (Ubuntu)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I managed to run a scrapy program in Ubuntu terminal. However, I cannot use Ctrl+Z and bg command to let it run in the background. It will close the spider connection everytime I press Ctrl + Z.\nIs there any workaround or ways to solve the issue?","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":2613,"Q_Id":44291111,"Users Score":0,"Answer":"You can use screen to run one or more task in the background","Q_Score":5,"Tags":"python,python-3.x,ubuntu,scrapy","A_Id":44650889,"CreationDate":"2017-05-31T17:22:00.000","Title":"Run scrapy in background (Ubuntu)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have 3 models. Rhyme, CommunityRhyme, and AssortedRhymes.\nRhyme(s) are collected by a bot.\nCommunityRhyme(s) are rhymes added by the community.\nAssortedRhymes contains a ManyToManyField that references only the Rhyme model.\nHow can I make it so that Rhyme and CommunityRhyme are of the same \"type\" so that the AssortedRhymes ManyToManyField that references the Rhyme model can also reference (add) CommunityRhymes?\nThank you in advance","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":33,"Q_Id":44293170,"Users Score":0,"Answer":"I deleted the CommunityRhyme model and added a \"is_community\" Boolean field to Rhyme.","Q_Score":0,"Tags":"python,django","A_Id":44293598,"CreationDate":"2017-05-31T19:24:00.000","Title":"How can I make two models the same \"type\"?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I get the following error: \nValueError: The default Firebase app already exists. This means you called initialize_app() more than once without providing an app name as the second argument. In most cases you only need to call initialize_app() once. But if you do want to initialize multiple apps, pass a second argument to initialize_app() to give each app a unique name.\nHow Can I check if the default firebase app is already initialized or not in python?","AnswerCount":10,"Available Count":1,"Score":0.0199973338,"is_accepted":false,"ViewCount":23579,"Q_Id":44293241,"Users Score":1,"Answer":"In my case, I faced a similar error. But my issue was, I have initialized the app twice in my python file. So it crashed my whole python file and returns a\nValueError: The default Firebase app already exists. This means you called initialize_app() more than once without providing an app name as the second argument. In most cases you only need to call initialize_app() once. But if you do want to initialize multiple apps, pass a second argument to initialize_app() to give each app a unique name. \nI solved this by removing one of my firebase app initialization. I hope this will help someone!!","Q_Score":30,"Tags":"python,firebase","A_Id":62375312,"CreationDate":"2017-05-31T19:30:00.000","Title":"check if a Firebase App is already initialized in python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm new to AWS in general, and would like to learn how to deploy a dynamic website with AWS. I'm coming from a self-hosted perspective (digitalocean + flask app), so I'm confused on what exactly the process would be for AWS.\nWith self-hosting solution, the process is something like:\n\nUser makes a request to my server (nginx)\nnginx then directs the request to my flask app\nflask app handles the specific route (ie, GET \/users)\nflask does db operations, then builds an html page using jinja2 with the results from the db operation\nreturns html to user and user's browser renders the page.\n\nWith AWS, I understand the following:\n\nUser makes a request to Amazon's API Gateway (ie, GET \/users)\nAPI Gateway can call a AWS Lambda function\nAWS Lambda function does db functions or whatever, returns some data\nAPI Gateway returns the result as JSON (assuming I set the content-type to JSON)\n\n\nThe confusing part is how do I generate the webpage for the user, not just return the JSON data? I see two options:\n1) Somehow get AWS Lambda to use Jinja2 module, and use it to build the HTML pages after querying the db for data. API Gateway will just return the finished HTML text. Downside is this will no longer be a pure api, and so I lose flexibility.\n2) Deploy Flask app onto Amazon Beanstalk. Flask handles application code, like session handling, routes, HTML template generation, and makes calls to Amazon's API Gateway to get any necessary data for the page.\nI think (2) is the 'correct' way to do things; I get the benefit of scaling the flask app with Beanstalk, and I get the flexibility of calling an API with the API Gateway.\n\nAm I missing anything? Did I misunderstand something in (2) for serving webpages? Is there another way to host a dynamic website without using a web framework like Flask through AWS, that I don't know about?","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":818,"Q_Id":44297372,"Users Score":1,"Answer":"The recommended way to host a server with lambda and without EC2 is: \n\nHost your front static files on S3 (html, css, js). \nConfigure your S3 bucket to be a static web server \nConfigure your lambdas for dynamic treatments and open it to the outside with API-gateway \nyour JS call the lambda through API-gateway, so don't forget to activate CORS (on the S3 bucket AND on API-gateway). \nconfigure route53 to link it with your bucket (your route53 config must have the same name as your bucket) so you can use your own DNS name, not the generic S3-webserver url","Q_Score":2,"Tags":"python,amazon-web-services,flask,aws-lambda,aws-api-gateway","A_Id":44307224,"CreationDate":"2017-06-01T02:06:00.000","Title":"Serving dynamic webpages using aws?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm new to AWS in general, and would like to learn how to deploy a dynamic website with AWS. I'm coming from a self-hosted perspective (digitalocean + flask app), so I'm confused on what exactly the process would be for AWS.\nWith self-hosting solution, the process is something like:\n\nUser makes a request to my server (nginx)\nnginx then directs the request to my flask app\nflask app handles the specific route (ie, GET \/users)\nflask does db operations, then builds an html page using jinja2 with the results from the db operation\nreturns html to user and user's browser renders the page.\n\nWith AWS, I understand the following:\n\nUser makes a request to Amazon's API Gateway (ie, GET \/users)\nAPI Gateway can call a AWS Lambda function\nAWS Lambda function does db functions or whatever, returns some data\nAPI Gateway returns the result as JSON (assuming I set the content-type to JSON)\n\n\nThe confusing part is how do I generate the webpage for the user, not just return the JSON data? I see two options:\n1) Somehow get AWS Lambda to use Jinja2 module, and use it to build the HTML pages after querying the db for data. API Gateway will just return the finished HTML text. Downside is this will no longer be a pure api, and so I lose flexibility.\n2) Deploy Flask app onto Amazon Beanstalk. Flask handles application code, like session handling, routes, HTML template generation, and makes calls to Amazon's API Gateway to get any necessary data for the page.\nI think (2) is the 'correct' way to do things; I get the benefit of scaling the flask app with Beanstalk, and I get the flexibility of calling an API with the API Gateway.\n\nAm I missing anything? Did I misunderstand something in (2) for serving webpages? Is there another way to host a dynamic website without using a web framework like Flask through AWS, that I don't know about?","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":818,"Q_Id":44297372,"Users Score":1,"Answer":"You definitely have to weigh the pros and cons of serving the dynamic website via API GW and Lambda. \nPros:\n\nLikely cheaper at low volume\nDon't have to worry about scaling\nLambda Functions are easier to manage than even beanstalk.\n\nCons:\n\nThere will be some latency overhead \nIn some ways less flexible, although Python is well supported and you should be able to import the jinja2 module.\n\nBoth of your proposed solutions would work well, it kind of depends on how you view the pros and cons.","Q_Score":2,"Tags":"python,amazon-web-services,flask,aws-lambda,aws-api-gateway","A_Id":44312884,"CreationDate":"2017-06-01T02:06:00.000","Title":"Serving dynamic webpages using aws?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a menu.py which contains all my menus. \nI would like to use the menu.py file and in case someone from another team needs to add additional sub-menus they can add them on their own file, then import menu.py as well.\nfor example: i have 2 sub-menus under \/models\/menu.py:\nsystem_sub_menu = [\n...               ....\n...               ....\n]\nfile_sub_menu = [\n...               ...\n...               ...\n]\nCan i separate them into 2 files?\nThanks \nYaron","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":72,"Q_Id":44302025,"Users Score":0,"Answer":"You have two options. First, you can put the two sets of items in two different files in the \/models folder. Model files are executed in alphabetical order, so you can put together the final response.menu object in the second of the two files (any variables defined in the first model file will be available globally in the second file, without any need to import).\nAlternatively, you can put one of the sub-menus in a module (in the \/modules folder) and simply import it where needed.","Q_Score":0,"Tags":"python,linux,python-2.7,web2py","A_Id":44313012,"CreationDate":"2017-06-01T08:12:00.000","Title":"web2py - is it possible to import content of menu.py from another file?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I know easy way, make a few different fields for needed currencies, but that's not only ugly, but the currencies will be hardcoded. It seems to me be more elegant through django-parler, but I do not quite understand how to do it.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":210,"Q_Id":44313288,"Users Score":1,"Answer":"The simplest way to localize prices in django-SHOP, is to use the MoneyInXXX class. This class can be generated for each currency using the MoneyMaker factory.\nWhenever an amount of a Money class is formatted, it is localized properly.","Q_Score":1,"Tags":"python,django,django-parler,django-shop","A_Id":50614495,"CreationDate":"2017-06-01T17:00:00.000","Title":"What the right way to localize the price in the Django-shop?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Django website with 3 environments (Local, Staging, Production).\nProduction contains some data that I don't want my developers to have access to (Personal data and financial data of users).\nDoing a DB backup restore is not an option for compliance reason.\nHowever we also have some content pages on this website that we manage with Wagtail CMS.\nI am looking for a way to sync production data (only some models but specifically the wagtail pages) back to Staging and Developers local environment when they need to.\nIdeally I would have a manage command that I can run in another environment to copy data:\nExample: .\/manage.py sync_from_prod BlogPost this would find all missing blog post in the local or staging environment and would create them in the database. I cannot find any library doing this for Wagtail or Django doing this. \nThis seems like a common problem and I am surprised to find no Stackoverflow questions or opensource libraries fixing this problem.\nIf nothing exist I will probably try to write my own django-model-sync (Found this project, but is 3 year old and compatible until django 1.7 and I am on python3 django 1.11)\nIn order to manage security, a secret could be used by a dev to access a production API exposing the data (over ssl) for example","AnswerCount":3,"Available Count":1,"Score":0.0665680765,"is_accepted":false,"ViewCount":2016,"Q_Id":44319954,"Users Score":1,"Answer":"I struggled mightily with the dumpdata \/ loaddata and had to assemble the answer from various sources, so I'll write a short summary of what worked for me in the end:\n\nOn Prod: .\/manage.py dumpdata -e contenttypes -e auth.Permission --output data.json\nOn Dev: flush your database .\/manage.py flush, if flushing does not work, see below\nOn Dev: .\/manage.py loaddata data.json\n\nIf flush does not work due to some data inconsistency on Dev which happened to me:\n\ndelete the db file\ndelete everything except the initials from the migrations folder rm *\/migrations\/0*.py\n.\/manage.py migrations && .\/manage.py migrate\n\nThen you should be able to load the data","Q_Score":6,"Tags":"python,django,database,development-environment,wagtail","A_Id":69073212,"CreationDate":"2017-06-02T02:37:00.000","Title":"Replicate part of production django database to local or staging","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"This is my first post so I did some research before asking this question, but it was all in vaine.\nI'm writing my python script for Android application and I need to use basic click() command, in order to get deeper.\nAndroid 6.0.1 (xiaomi redmi note 3 pro), SDK installed for Android 6.0, python 3.6.1, Appium 1.0.2 + Pycharm.\nElement is localized with no problems, but click() doesn't work, nothing happens. \nPart of my script:\ndriver.find_element_by_id('com.socialnmobile.dictapps.notepad.color.note:id\/main_btn1').click()\nI tried to use .tap() instead, but it says \"AttributeError: 'WebElement' object has no attribute 'tap'\". \nI would be very grateful for your help, cause I'm stuck with it for good.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":305,"Q_Id":44325823,"Users Score":0,"Answer":"Try this\ndriver.find_element_by_id('main_btn1').click() \nFind the ID mentioned under the resource id in case you are using appium version less than 1.0.2 \nYou are pasting the whole package id com.socialnmobile.dictapps.notepad.color.note:id\/main_btn1 which appium wont detect because that is certainly not the element id. \nIn case this doesnt work, please let me know the contents you see in the inspector.","Q_Score":0,"Tags":"android,python,appium","A_Id":44330828,"CreationDate":"2017-06-02T09:46:00.000","Title":"Python+Appium+Android 6.0.1 - 'Click()' doesn't work","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"This is my first post so I did some research before asking this question, but it was all in vaine.\nI'm writing my python script for Android application and I need to use basic click() command, in order to get deeper.\nAndroid 6.0.1 (xiaomi redmi note 3 pro), SDK installed for Android 6.0, python 3.6.1, Appium 1.0.2 + Pycharm.\nElement is localized with no problems, but click() doesn't work, nothing happens. \nPart of my script:\ndriver.find_element_by_id('com.socialnmobile.dictapps.notepad.color.note:id\/main_btn1').click()\nI tried to use .tap() instead, but it says \"AttributeError: 'WebElement' object has no attribute 'tap'\". \nI would be very grateful for your help, cause I'm stuck with it for good.","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":305,"Q_Id":44325823,"Users Score":1,"Answer":"Ok, after a long fight I came up with the solution. My smartphone - Xiaomi Redmi Note 3 Pro apart from standard USB Debugging option in settings, has another USB Debugging (security option). It has to be enabled as well, cause the second option protects smartphone from remote moves. Regards.","Q_Score":0,"Tags":"android,python,appium","A_Id":44336428,"CreationDate":"2017-06-02T09:46:00.000","Title":"Python+Appium+Android 6.0.1 - 'Click()' doesn't work","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So, I created a simple site written in Python using Web.py. It's now live and running. I can access it through my computer that runs the server by typing one of this: http:\/\/0.0.0.0:8080\/ or http:\/\/localhost:8080\/. However, I can only access it through that computer that runs the Python Web.py server. \nI tried accessing it with another computer on the same network, but it gives me an error. Help?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":947,"Q_Id":44328855,"Users Score":0,"Answer":"You need to check your firewall. Try to disable it and it will work fine.","Q_Score":0,"Tags":"python,python-2.7,network-programming,web.py","A_Id":50786355,"CreationDate":"2017-06-02T12:21:00.000","Title":"How to access Python web.py server in LAN?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I read the Flask doc, it said whenever you need to access the GET variables in the URL, you can just import the request object in your current python file? \nMy question here is that if two user are hitting the same Flask app with the same URL and GET variable, how does Flask differentiate the request objects? Can someone tell me want is under the hood?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":553,"Q_Id":44337390,"Users Score":0,"Answer":"Just wanted to highlight one more fact about the requests object.\nAs per the documentation, it is kind of proxy to objects that are local to a specific context.\n\nImagine the context being the handling thread. A request comes in and the web server decides to spawn a new thread (or something else, the underlying object is capable of dealing with concurrency systems other than threads). When Flask starts its internal request handling it figures out that the current thread is the active context and binds the current application and the WSGI environments to that context (thread). It does that in an intelligent way so that one application can invoke another application without breaking.","Q_Score":0,"Tags":"python,flask","A_Id":48550508,"CreationDate":"2017-06-02T21:02:00.000","Title":"Flask\/Python: from flask import request","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I wonder if a good habit is to have some logic in MySQL database (triggers etc.) instead of logic in Django backend. I'm aware of fact that some functionalities may be done both in backend and in database but I would like to do it in accordance with good practices. I'm not sure I should do some things manually or maybe whole database should be generated by Django (is it possible)? What are the best rules to do it as well as possible? I would like to know the opinion of experienced people.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":133,"Q_Id":44353532,"Users Score":1,"Answer":"It is true that if you used a database for your business logic you could get maximum possible performance and security optimizations. However, you would also risk many things such as \n\nNo separation of concerns\nBeing bound to the database vendor\netc.\n\nAlso, whatever logic you write in your database won't be version controlled with your app. Thus, whenever you change your database, you will have to create all those things once again.\nInstead, use Django ORM. It will create and manage your database based on your models by itself. As a result, whenever you recreate your database, you will just have to run migrations with one single command and you are done.\nThis will cover most of the situations. And whenever you will need those speeds of stored procedures, Django ORM has you covered as well.\nIn short, I believe that business logic should be kept out of the database as much as possible.","Q_Score":0,"Tags":"python,mysql,django,django-models,django-rest-framework","A_Id":44354531,"CreationDate":"2017-06-04T11:24:00.000","Title":"Django - backend logic vs database logic","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was wondering if it is possible to get all the URL's from the history page of a person, perhaps with python (using selenium, or any other tool)?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":181,"Q_Id":44354833,"Users Score":2,"Answer":"No, that is not possible for two reasons:\n\nPython is a server side language that is not executed in the user's browser \nEven if you did use a client side language that runs in the user's browser (i.e. JavaScript), security restrictions prevent this\n\nThink of the implications if this were possible: Would you want any company whose website you are accessing to be able to spy on you like that?","Q_Score":0,"Tags":"python,web","A_Id":44354888,"CreationDate":"2017-06-04T13:55:00.000","Title":"Getting the user's browsing history's URLs","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"If for example I want to show a zero(0) for all users to see, and I want all users to add one(1) to the number With their Identity only shown for superusers. And how to make sure that each user only can add one time, and of course what is the Security requirements that have to be done to prevent unautohrized Access to change any of this or to get any information?\nI understand this is a big topic, but could someone briefly explain for me what parts of Programming that are involved, and maybe some good books on these topics?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":79,"Q_Id":44358307,"Users Score":4,"Answer":"The web is stateless. This means that if a browser requests the same page twice, a traditional web server has no real way of knowing if it's the same user.\nEnter sessions. Django has an authentication system which requires each user to log in. When the user is logged in they're given a session. A session is made of two parts; A cookie containing a randomly generated token, and a database entry with that same token.\nWhen a user logs in, a new session token is generated and sent, via a cookie, back to the user which the browser stores. At the same time, that record is created in the database. Each time a browser makes a request to Django, it sends its session cookie along with the request and Django compares this to the tokens in the database. If the token exists, the user is considered to be logged in. If the token doesn't exist, the user isn't logged in.\nIn Django, there are User models which make it easy to check who the currently logged in user is for each request. They're doing all that token checking in the background for us on each and every request made by every user. Armed with this, we can associate other models via \"foreign key\" relationships to indicate who owns what.\nSay you were making a blog where multiple users could write articles. If you wanted to build an editing feature you'd probably want to restrict users to only be allowed to edit their own articles and nobody else's. In this situation, you'd receive the request, find out who the current user was from it, compare that user to the \"author\" field on the blog Post model and see if that foreign key matches. If it matches, then the user making the current request is the owner and is allowed to edit.\nThis whole process is secured by the fact that the session tokens are randomly generated hashes, rather than simple ID numbers. A malicious attacker can't simply take the hash and increment the value to try and access adjacent accounts, they'd have to intercept another user's hash entirely. This can be further secured by using SSL certificates so that your connections go over https:\/\/ and all traffic is encrypted between the browser and your server.","Q_Score":0,"Tags":"python,django","A_Id":44358407,"CreationDate":"2017-06-04T20:06:00.000","Title":"How does django know which user owns what data?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a situation where if I run Apache with wsgi (now uninstalled), a test website works, but running the same server with runserver 0.0.0.0:8080 gives ERR_CONNECTION_REFUSED from local or remote (even with the apache2 service stopped).\nEdit: I don't think it's Apache, I've reproduced the problem on a clean server with no Apache installed, so unless Apache somehow modified something under source control it's not that\nMy knowledge of web details is hazy, I don't even know where to troubleshoot this problem - the devserver runs (runserver prints as expected and doesn't give any errors) but never receives a request, I have nothing in iptables.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":246,"Q_Id":44358803,"Users Score":0,"Answer":"Sorry for anyone who read this, it would probably have been impossible to solve given my supplied information.\nWhat had actually happened was that I'd been having to modify my wsgi.py script in order to make it happy inside the Apache server, and I'd added a line which said \"os.system('\/bin\/bash --rcfile )\" to try and make sure that when running inside apache it got the virtualenv activated.\nThis line must have been causing some strange problem, another symptom was that I realised when I was running \"runserver\", it wasn't crashing the the python process was backgrounding itself, where normally it runs inside that console window.\nThanks everyone who asked questions helping me debug!","Q_Score":0,"Tags":"python,django,apache,wsgi","A_Id":44366981,"CreationDate":"2017-06-04T21:10:00.000","Title":"django devserver can't connect","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I want to get eta of task in celery each time with get request. There is no direct api in celery to get task scheduled time (except inspect() - but it's seems very costly to me)\nHow can i manage eta of particular task? The downside of storing eta time in Django model is not consistent ( either i couldnt store taks_id because i can't -  dont know how get eta from task_id)\nI see on one question that there is no api, cause it somehow depends on brokers and etc. But i hope that there is some solution\nSo what's the best way manage task_id to get eta? \nBackend and broker is redis","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":429,"Q_Id":44367961,"Users Score":0,"Answer":"I don't think there is a magic way to do this.\nWhat I do in my app is just log the execution time for each task and return that as an ETA. If you wanted to get a little more accurate you could also factor in the redis queue size and the task consumption rate.","Q_Score":0,"Tags":"python,redis,celery,estimation","A_Id":44961359,"CreationDate":"2017-06-05T11:28:00.000","Title":"Celery best way manage\/get eta of task","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a few django micro-services.\nTheir main workload is constant background processes, not request handling.\nThe background processes constantly use Django's ORM, and since I needed to hack a few things for it to work properly (it did for quite a while), now I have problems with the DB connection, since Django is not really built for using DB connections a lot in the background I guess...\nCelery is always suggested in these cases, but before switching the entire design, I want to know if it really is a good solution.\nCan celery tasks (a lot of tasks, time-consuming tasks) use Django's ORM in the background without problems?","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1506,"Q_Id":44368133,"Users Score":0,"Answer":"Celery was originally written specifically as an offline task processor for Django, and although it was later generalised to deal with any Python code it still works perfectly well with Django.\nHow many tasks there are and how long they take is pretty much irrelevant to the choice of technology; each Celery worker runs as a separate process, so the limiting resource will be your server capacity.","Q_Score":0,"Tags":"python,django,celery","A_Id":44368455,"CreationDate":"2017-06-05T11:38:00.000","Title":"Use Django's ORM in Celery","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a few django micro-services.\nTheir main workload is constant background processes, not request handling.\nThe background processes constantly use Django's ORM, and since I needed to hack a few things for it to work properly (it did for quite a while), now I have problems with the DB connection, since Django is not really built for using DB connections a lot in the background I guess...\nCelery is always suggested in these cases, but before switching the entire design, I want to know if it really is a good solution.\nCan celery tasks (a lot of tasks, time-consuming tasks) use Django's ORM in the background without problems?","AnswerCount":3,"Available Count":2,"Score":0.1973753202,"is_accepted":false,"ViewCount":1506,"Q_Id":44368133,"Users Score":3,"Answer":"Can celery tasks (a lot of tasks, time-consuming tasks) use Django's ORM in the background without problems?\n\nYes, depending on your definition of \u201cproblems\u201d :-)\nMore seriously: The Django ORM performance will be mostly limited by the performance characteristics of the underlying database engine.\nIf your chosen database engine is PostgreSQL, for example, you will be able to handle a high volume of concurrent connections.","Q_Score":0,"Tags":"python,django,celery","A_Id":44382660,"CreationDate":"2017-06-05T11:38:00.000","Title":"Use Django's ORM in Celery","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am new to Django and have completed the 7 part tutorial and am now trying to learn more by making my own app.\nSuppose you are making an interactive data visualization application where the front end is powered by d3 (or your favorite JS library) and your data is coming from the server. Since your data is large, you first have to load it into server memory (maybe from a binary file, or however you store it). Yet you don't want your user to be looking at a blank page when they could be seeing the rest of the site (maybe filling in some parameters for the interactive data).\nHow can you, when a user requests a web-page, load and maintain data in memory on the server while Django still renders the page as well as maybe sends POST requests to update some server side information?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1588,"Q_Id":44373924,"Users Score":4,"Answer":"Django doesn't have any asynchronous method to deal with what you're asking. The platform is request-based so there's no way to send the information later using the same request.\nThe solution in this case is using two views (or a view that can handle multiple formats, like @SumNeuron mentioned):\n\nThe first view loads the page where you'll be loading the data later. On that page, an XMLHttpRequest is done to request the data.\nThis view only sends the data, it can be just the data in JSON or it can be partial HTML made from a template.","Q_Score":1,"Tags":"python,django,python-3.x","A_Id":44374195,"CreationDate":"2017-06-05T16:59:00.000","Title":"Django: asynchronously load data when page is requested?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So I just bought a VPS server from Vultr. Then I went on ServerPilot, and installed it on my server.\nNow I can access, via SFTP, all the files on my server.\nBut how can I access these files from my web-browser via Internet? I mean, when I type in the IP address of my Vultr Server, I land on the ServerPilot page \"your app xxx is set up\". Alright, but how can I access the other files I uploaded now?\nThanks","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":110,"Q_Id":44376270,"Users Score":1,"Answer":"you can connect to your server\/serverpilot app via SSH\/SFTP.\nFilezilla, codeanywhere are options that allow you to do this.","Q_Score":0,"Tags":"python,html,hosting,vps","A_Id":46166962,"CreationDate":"2017-06-05T19:26:00.000","Title":"Beginner VPS Vultr\/ServerPilot -> How to change the homepage & access the files I uploaded?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Many Visualisation libraries and languages provide easy ways of generating any color. for example you could simple add a style tag with a css color code to set the color of an object in html.\nIs there a similiar way to set the color of a pyx drawing to any wanted color code instead of the predefined pyx color codes?\n(for example something like color.code = #1122DD instead of color.rgb.blue)","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":216,"Q_Id":44378805,"Users Score":1,"Answer":"PyX provides several color schemes for defining colors, if you want to use RGB as a hex string you can provide it as: pyx.color.rgbfromhexstring(\"#1122DD\").","Q_Score":2,"Tags":"python,colors,visualization,pyx","A_Id":44378914,"CreationDate":"2017-06-05T22:43:00.000","Title":"How to generate any color in PyX","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Many Visualisation libraries and languages provide easy ways of generating any color. for example you could simple add a style tag with a css color code to set the color of an object in html.\nIs there a similiar way to set the color of a pyx drawing to any wanted color code instead of the predefined pyx color codes?\n(for example something like color.code = #1122DD instead of color.rgb.blue)","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":216,"Q_Id":44378805,"Users Score":2,"Answer":"Here is the way I found as the most convenient to have a simple RGB color:\npyx.color.rgb(r,g,b)\nwhere r, g, b are numbers in the range [0, 1] and set the percentage of each base color in RGB format.","Q_Score":2,"Tags":"python,colors,visualization,pyx","A_Id":44378992,"CreationDate":"2017-06-05T22:43:00.000","Title":"How to generate any color in PyX","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm building a website with some backprocessing with python. I want to know how to execute my python code from the server ?\nThere is no direct link between my HTML pages and my python code.\nLet's say I want to do an addition with python in the server, how can I do that ?\nThanks so much in advence :)","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":105,"Q_Id":44387283,"Users Score":0,"Answer":"is your server is linux or windows?\nfor linux: you can add a script to run your script on runlevel 3 or 5\nwrite a script put it under \/etc\/init.d\/ folder then link your script \/etc\/rc3.d or \/etc\/rc5.d to be start","Q_Score":0,"Tags":"python,server","A_Id":44387505,"CreationDate":"2017-06-06T10:15:00.000","Title":"Running python code on server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on creating a Sphinx theme based on Accelerated Mobile Pages (AMP). While creating it, I came to realize that since AMP uses amp-img tag in place of the img tag. Is there a way to convert all the img tag in the sphinx generated docs to amp-img","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":94,"Q_Id":44389123,"Users Score":0,"Answer":"There is nothing out of the box. The easiest option is to post-process your HTML output from Sphinx.","Q_Score":1,"Tags":"python-sphinx,accelerated-mobile-page","A_Id":44396007,"CreationDate":"2017-06-06T11:43:00.000","Title":"Use amp-img tag in place of img tag for images - Sphinx","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm a beginner, and I'm learning Django for web development. So I want to know for my little test, should in always have a virtualenv or can I continue to learn without installing it? I've asked because in youtube Django videos, some instructors are installing it, and others aren't.","AnswerCount":5,"Available Count":3,"Score":0.0399786803,"is_accepted":false,"ViewCount":987,"Q_Id":44392159,"Users Score":1,"Answer":"This is to some extent an opinion based question, but because it concerns good practices I'd like to drop few lines.\nSome instructors in Django videos don't say anything about virtualenvs, maybe because their course aims at Django and not virtualenvs and their videos can't have it all.\nIt is generally a good practice to use virtual environments for Python, especially for web development. You'll start with some tutorial and use certain version of Django. For your next project, you'd like eventually to go with the latest or maybe the LTS version. Don't mess everything by installing packages globally as root.\nBeyond virtualenv I'd strongly recommend using virtualenvwrapper, which makes the use of virtual environments a real pleasure.","Q_Score":0,"Tags":"python,django,virtualenv","A_Id":44392332,"CreationDate":"2017-06-06T14:02:00.000","Title":"Should I always use virtualenvs in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm a beginner, and I'm learning Django for web development. So I want to know for my little test, should in always have a virtualenv or can I continue to learn without installing it? I've asked because in youtube Django videos, some instructors are installing it, and others aren't.","AnswerCount":5,"Available Count":3,"Score":0.0399786803,"is_accepted":false,"ViewCount":987,"Q_Id":44392159,"Users Score":1,"Answer":"Your question is:\n\nCan I continue without installing it?\n\nSo the answer is yes.\nThe virtualenv is not a requirement to set up a Django project. Nevertheless, you will eventually use virtualenvs in the future when you are more aware of dependencies, so why don't you start to learn now how to use them?\nA virtualenv is not the only solution to isolate your project's dependencies but is the most commonly used in Python developments.","Q_Score":0,"Tags":"python,django,virtualenv","A_Id":44392512,"CreationDate":"2017-06-06T14:02:00.000","Title":"Should I always use virtualenvs in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm a beginner, and I'm learning Django for web development. So I want to know for my little test, should in always have a virtualenv or can I continue to learn without installing it? I've asked because in youtube Django videos, some instructors are installing it, and others aren't.","AnswerCount":5,"Available Count":3,"Score":1.2,"is_accepted":true,"ViewCount":987,"Q_Id":44392159,"Users Score":3,"Answer":"No. It's not mandatory to use virtualenvs but it might help.\nI think you need to understand what virtualenvs does and when to use it.\nWhat virtualenvs does is creating an isolated environment(for example, a django project) from others.\nIt's not just a Django component. It can be used for other projects as well. \nLet's assume that there are two different projects, A and B. It doesn't matter if they are Django projects.\nIn project A, you might want to use python module AAA(version 1.00). And in project B, you also want to use python module AAA(version 2.00). Both use the same module but their versions are different.\nIn those cases you can use virtualenvs to create two different environments and isolate those. And install AAA version 1.0, AAA version 2.0 in those environment respectively.\nWhen people start a new project, it's very natural and common to create a new isolated environment only for it. Then it would be easy to move the project to another computer or recreate exactly the same environment in other machines. Also it won't be affected by other previously installed modules or configuration. If there are other modules before your project might work differently and you might not find that until you deploy. \nSo it's not mandatory but using it is a good practice.\nAlso there are many tools for creating an isolated environment in different layers like Conda, Docker etc... Take a look at those as well.","Q_Score":0,"Tags":"python,django,virtualenv","A_Id":44392668,"CreationDate":"2017-06-06T14:02:00.000","Title":"Should I always use virtualenvs in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to use the REST api to link a wordpress e-commerce (using woocommerce) website and a Django app.\nMy question is, how can I execute a python script inside Django, and return data after a purchase has been made on the e-commerce website.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":2463,"Q_Id":44395496,"Users Score":1,"Answer":"Woocommerce now has a REST webhooks API that can push orders to your django when orders are made\/updated\/deleted - its great.\nI'm doing this with my site Adventuretickets.nl - you can ask for code samples. \nGoogle woocommerce webhooks API for documentation on what exactly they will send you on new order. You can write normal django views to receive the JSON. \nIf you do need to pull from Woocommerce, you can use package django-woocommerce.","Q_Score":2,"Tags":"python,django,rest,woocommerce","A_Id":47623906,"CreationDate":"2017-06-06T16:41:00.000","Title":"Django and woocommerce","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I would like to know whether I could return a pdf as a response to Google App Engine Endpoints for Python.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":40,"Q_Id":44404237,"Users Score":0,"Answer":"Responses from Google Cloud Endpoints APIs must be of content-type application\/json. You could bundle the binary data of the PDF in a JSON value by encoding it with base64.","Q_Score":0,"Tags":"python,google-app-engine,google-cloud-endpoints","A_Id":44442742,"CreationDate":"2017-06-07T05:30:00.000","Title":"What are the supported return types for Google App Engine Endpoints for Python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have installed odoo - 9 in my local , I cannot able to see my custom module in update module list. I have activated \"Developer Mode\" even though it is not appearing in my module list. I also updated the module list, Can anybody guide me to install \"Custom Module\"  .","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":156,"Q_Id":44408340,"Users Score":1,"Answer":"To install a new module in Odoo you have to :\n\nTake a acces right to your new module : chmod -R 755 custom_module\nIn admin user activate external carctirstique\nrestart the service service odoo restart\nUpdate module list","Q_Score":0,"Tags":"python,odoo-9","A_Id":44408527,"CreationDate":"2017-06-07T09:11:00.000","Title":"odoo - 9 how to install custom module in odoo 9","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am developing a django application which handles lots of file uploads from multiple clients periodically. Each file is around 1 to 10 megabytes.\nSince uploads are thread blocking I can only serve a number of requests equivalent to the number of uwsgi workers\/processes (4 in my case).\nWhat should I do to increase throughput?\nIs it advisable to increase number of processes\/workers in uwsgi? \nWhat should be the upper limit? \nIs there any other solution that I can use in this scenario?\nStack: django+uwsgi+nginx running on amazon ec2 and s3 buckets used for storing zip files.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":700,"Q_Id":44411632,"Users Score":0,"Answer":"What should be the upper limit?\n\nThat depends on your hardware such as quantity of core in your server\n\nIs there any other solution that I can use in this scenario?\n\nConsider using Celery\/rabbitMQ. Celery could be used to process asynchronously file or upload to S3 and notify the events to rabbitMQ","Q_Score":1,"Tags":"python,django,amazon-s3,uwsgi","A_Id":44416796,"CreationDate":"2017-06-07T11:40:00.000","Title":"Django - Handling several file upload requests at a time?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a PostgreSQL database that is being used by a front-end application built with Django, but being populated by a scraping tool in Node.js. I have made a sequence that I want to use across two different tables\/entities, which can be accessed by a function (nexval(serial)) and is called on every insert. This is not the primary key for these tables, but simply a way to maintain order through some metadata. Using it in Node.js during the insertion of the data into the tables is trivial, as I am using raw SQL queries. However, I am struggling with how to represent this using Django models. There does not seem to be any way to associate this Postgres function with a model's field.\nQuestion:\nIs there a way to use a Postgres function as the default value of a Django model field?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2587,"Q_Id":44444385,"Users Score":1,"Answer":"My eventual solution:\nOverride the save method of the model, using a raw query to SELECT nextval('serial') inside the override, setting that as the value of the necessary field, then call save on the parent (super(PARENT, self).save()).","Q_Score":3,"Tags":"python,django,postgresql,orm","A_Id":44806040,"CreationDate":"2017-06-08T19:47:00.000","Title":"Postgres Sequences as Default Value for Django Model Field","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it possible to send the result of a Python script to the input field of a PHP page? \nI am using a PYTHON script to capture weight data from a scale. I would like to use that data from the python script, placing it into the input field of a PHP page.\nThe name of the input field on the page will remain static, as will the name of the page.\nTo initiate the process (from python script to the input field) I would use an on click command or something similar. \nI am very new to python and very much appreciate any help.\nBob","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":140,"Q_Id":44466061,"Users Score":0,"Answer":"You have to expose the data to the Internet - either create an upload script in PHP that will receive data whenever your Python script captures the new weight (you probably don't want this approach), or write a PHP script that will execute the Python script, take its output and send it back to you. You can then reload the whole page or use JavaScript to update the input field\nHope this helps you, comment if you have any questions","Q_Score":0,"Tags":"php,python","A_Id":44466115,"CreationDate":"2017-06-09T20:15:00.000","Title":"Send output to a PHP input field","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to Amazon Web Services (AWS) & I am using the free tier t2.micro right now ( 1 CPU and 1 GB memory).  Doing some backtesting\/ simulation stuff and it seems free tier is quite inadequate. Pretty slow actually. Thus thinking of options which will help me to run my code at a faster speed for few hours.\nOption 1 : I can 1 buy CPU optimized\/ higher Memory instance ( 4 cores and 4 GB RAM for example ) and then make an image of my t2.micro and run my stuff in that new one. It will be expensive though if I keep it running, so I need to \"stop\" the instance when I am not working  ( or nothing is running ) to reduce the cost. \nOption 2 : I can buy spot instances. I am not sure how to use the CPU and RAM of that spot instance from my existing t2.micro. Can I create a temporary grid\/cluster where my Head Node will be running in my t2.micro but compute node will be the spot instance ( higher CPU and RAM ), thus all my calculations, etc will be using the spot instance. \nMy question : Is the Option 2 possible ? I program everything in python and I have all the relevant softwares\/python IDEs etc are already installed in my t2.micro instance.\nAny existing grid\/cluster software I can use right now ? I don't know C++, Csharp, Java etc. Know only phython & R so any programming stuff I need to do to build a grid\/cluster must use Python :)\nThank you in advance.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":582,"Q_Id":44468527,"Users Score":0,"Answer":"Much of what you are asking depends upon your use-case. For example, if you have work continually arriving then you will need capacity continually available. However, if it is more batch-oriented then you could start\/stop capacity and even use the new Amazon Batch service that can allocate resources when needed and remove them when jobs are finished.\nSome things to note:\n\nYou can change the Instance Type when an instance is stopped. So, your t2.micro instance can be changed to a large instance (eg m4.xlarge) by stopping it, changing the instance type and starting it again.\nThe t2.micro Instance Type is actually extremely powerful when CPU burst credits are available, but it limited in capability when all CPU Credits are consumed. A good machine for bursty workloads, but not continual workloads.\nSpot instances are great, but please note that they will be terminated if the Spot Price goes above your bid price. Prices vary by region, Availability Zone within a region and instance type, so you could launch instances with a variety of attributes (different AZs, different instance types) that would make it unlikely that you would lose all capacity at the same time. Spot can save considerable costs and is well worth investigating.\nTake a look at Amazon EMR, which runs Hadoop to provide parallel processing across a cluster of instances.\nStop instances when you don't need them. That's the best way to get good value!","Q_Score":0,"Tags":"python,amazon-web-services","A_Id":44469173,"CreationDate":"2017-06-10T01:04:00.000","Title":"Cluster with t2.micro instances in AWS","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using python Tornado to perform asynchronous requests to crawl certain websites and one of the things I want to know is if a URL results in a redirect or what it's inital status code is (301, 302, 200, etc.). However, right now I can't figure out a way to find that information out with a Tornado response. I know a requests response object has a history attribute which records the redirect history, is there something similar for Tornado?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":65,"Q_Id":44508737,"Users Score":0,"Answer":"Tornado's HTTP clients do not currently provide this information. Instead, you can pass follow_redirects=False and handle and record redirects yourself.","Q_Score":0,"Tags":"python,tornado","A_Id":44511338,"CreationDate":"2017-06-12T21:08:00.000","Title":"Is there a way to get the redirect history from a Tornado response?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have an standard appengine app currently running. I am currently developing another flask app which will use flexible runtime. I am wondering is it possible for me to have both apps in same project?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":460,"Q_Id":44539192,"Users Score":0,"Answer":"There is an even easier way to do this that doesn't require creating a separate service :)\nSince you are only developing your second application, you do not need to set it as the default version to serve traffic to the public.  You only need to access it yourself, (or perhaps whoever you give the URL to).  The only drawback really is that you will not be able to access your project at the default url, usually .appspot.com\nTherefore, you can simply deploy your flexible app engine project, but make sure you don't give it any traffic sharing or promote it to the main version!!  You can then access your version simply by clicking on the version in the google cloud console, or by visiting http:\/\/-dot-.appspot.com\/ (It was not possible to access individual versions like this for flexible for quite some time, but this has now been resolved.)","Q_Score":0,"Tags":"google-app-engine,google-cloud-platform,google-app-engine-python,app-engine-flexible","A_Id":44711051,"CreationDate":"2017-06-14T08:15:00.000","Title":"Is it possible to have both appengine fleixble and standard in single project","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"i'm actually making ajax request that call a php file which call a python file. My main problem is with the imports in the python scripts. I actually work on local.\nI'm on linux. When i do \"$ php myScript.php\"  ( which call python script inside ) it's work but when it come from the ajax call then the import of the python files does not work. So i moved some libraries in the current folder of the php and python script. First the import will only work if the library is in a folder, impossible to call a function from my other python script. Then i can't do \" import tweepy \" even if the library is in the current folder. But for pymongo its worked because I do \" from pymongo import MongoClient \". All my script worked when call from php or when executed with python throw command line.\nThoses libraries are also in my current python folder on linux but throw ajax call it never go there. I specify this at the beginning of each python file \"#!\/usr\/bin\/env python2.7\"\nHere the path of my files \nfolder \n----- script.php \n----- script.py \n----- pymongo[FOLDER] \n----- tweepy[FOLDER] \nPs : Sorry english is not my main language","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":104,"Q_Id":44558269,"Users Score":0,"Answer":"I finally succeed. In fact tweepy use the library call \"six\" which is not in my current folder. So i import all the python library in my folder, so i get no more error. \nBut i still don't understand why python does not go search the library in his normal folder instead in the current folder.","Q_Score":0,"Tags":"php,python,ajax,import,directory","A_Id":44577194,"CreationDate":"2017-06-15T03:56:00.000","Title":"executing python throw ajax , import does not work","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying port a python code into java and am stuck at one place. Is there any method in java that is equivalent to numpy.random.uniform() in python?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":674,"Q_Id":44559717,"Users Score":0,"Answer":"Just use \n\nRandom rnd = new Random();\nrnd.nextInt(int boundary);\nrnd.nextDouble(double boundary);\nrnd.next();\n\nIf you want a list of randoms the best way is probably ti write your own little method, just use an array and fill it with a for loop.","Q_Score":0,"Tags":"java,python,random,distribution,uniform-distribution","A_Id":44561811,"CreationDate":"2017-06-15T06:02:00.000","Title":"Equivalent method in Java for np.random.uniform()","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Can the flask.request object be used similarly to flask.g to store per-request data? \nI am writing a library that is compatible with both Flask and Django. I plan to store information on the request object in both cases. Can I safely store objects on the request, say request.user, with the assurance that it will not be shared between different requests?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1251,"Q_Id":44571764,"Users Score":9,"Answer":"Yes, it is safe. The request object is unique per request.\nTypically g is used because it is an empty namespace specifically created for holding data during a request.\nrequest is an internal object with existing meaning, although it is common for libraries to use it for storage, leaving g for \"application level\" data.","Q_Score":6,"Tags":"python,flask","A_Id":44572046,"CreationDate":"2017-06-15T15:44:00.000","Title":"Is it safe to store per-request data on flask.request?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm on Docker for past weeks and I can say I love it and I get the idea. But what I can't figure out is how can I \"transfer\" my current set-up on Docker solution. I guess I'm not the only one and here is what I mean.\nI'm Python guys, more specifically Django. So I usually have this:\n\nDebian installation\nMy app on the server (from git repo).\nVirtualenv with all the app dependencies\nSupervisor that handles Gunicorn that runs my Django app.\n\nThe thing is when I want to upgrade and\/or restart the app (I use fabric for these tasks) I connect to the server, navigate to the app folder, run git pull, restart the supervisor task that handles Gunicorn which reloads my app. Boom, done.\nBut what is the right (better, more Docker-ish) approach to modify this setup when I use Docker? Should I connect to docker image bash somehow everytime I want upgrade the app and run the upgrade or (from what I saw) should I like expose the app into folder out-of docker image and run the standard upgrade process?\nHope you get the confusion of old school dude. I bet Docker guys were thinking about that.\nCheers!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":284,"Q_Id":44591775,"Users Score":3,"Answer":"For development, docker users will typically mount a folder from their build directory into the container at the same location the Dockerfile would otherwise COPY it. This allows for rapid development where at most you need to bounce the container rather than rebuild the image.\nFor production, you want to include everything in the image and not change it, only persistent data goes in the volumes, your code is in the image. When you make a change to the code, you build a new image and replace the running container in production.\nLogging into the container and manually updating things is something I only do to test while developing the Dockerfile, not to manage a developing application.","Q_Score":1,"Tags":"python,django,git,docker","A_Id":44591974,"CreationDate":"2017-06-16T14:27:00.000","Title":"Docker vs old approach (supervisor, git, your project)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Is it good to put html code in a Django TextField that will be used in a blog app?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1043,"Q_Id":44605000,"Users Score":0,"Answer":"It's all right you use any HTML in django textfield, for example, if you are using TinyMCE, this kind of list can be used very easily","Q_Score":0,"Tags":"python,django,django-models,django-apps","A_Id":44605316,"CreationDate":"2017-06-17T13:08:00.000","Title":"Is it ok to put html code in Django TextField?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Firstly, this question isn't a request for code suggestions- it's more of a question about a general approach others would take for a given problem. \nI've been given the task of writing a web application in python to allow users to check the content of media files held on a shared server. There will also likely be a postgres database from which records for each file will be gathered.\nI want the web app to:\n1) Suggest the next file to check (from files that have yet to be checked) and have a link to the next unchecked file once the result of the previous check have been submitted. \n2) Prevent the app from suggesting the same file to multiple users simultaneously. \nIf it was just one user checking the files it would be easier, but I'm having trouble conceptualising how i'm going to achieve the two points above with multiple simultaneous users.\nAs I say, this isn't a code request i'm just just interested in what approach\/tools others feel would be best suited to this type of project. \nIf there are any python libraries that could be useful i'd be interested to hear any recommendations.\nThanks","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":49,"Q_Id":44606342,"Users Score":1,"Answer":"These requirements are more or less straightforward to follow. Given that you will have a persistent database that can share the state of each file with multiple sessions - and even multiple deploys - of your system - and that is more or less a given with Python + PostgreSQL.\nI'd  suggest you to create a Python class with a few fields yuu can use for the whole process, and use an ORM like SQLAlchemy or Django's to bind those to a database. The fields you will need are more or less: filename, filpath, timestamp, check_status - and some extra like \"locked_for_checking\", and \"checker\" (which might be a foreignkey to a Users collection). On presenting a file as a sugestion for  a given user, you set the \"locked_for_checking\" flag - and for the overall listing, yu create a list that exc\u00e7uds files \"checked\" or \"locked_for_checking\". (and sort the  files by timestamp\/size or other metadata that attends your requirements). \nYou will need some logic to \"unlock for checking\" if the first user does not complete  the checking in a given time frame, but that is it.","Q_Score":0,"Tags":"python,postgresql,python-3.x,flask","A_Id":44608243,"CreationDate":"2017-06-17T15:37:00.000","Title":"Python web app ideas- incremental\/unique file suggestions for multiple users","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have looked for Python 2.7.12 in my apps and docs but I can't find it... \nI'm using a macbook pro.\nI can see Python 3.6 in my applications so I don't know why the terminal isn't referring to this one.  \nI want to get started learning django but I don't think it will be possible if I don't use Python 3.5 or later.  \nis there a way to tell the terminal to use 3.6 instead?","AnswerCount":4,"Available Count":4,"Score":0.0,"is_accepted":false,"ViewCount":2694,"Q_Id":44615007,"Users Score":0,"Answer":". ~\/.bashrc\nalias python='\/usr\/bin\/python3.4'","Q_Score":0,"Tags":"python,django,macos,terminal,installation","A_Id":44615048,"CreationDate":"2017-06-18T12:33:00.000","Title":"Downloaded Python 3.6 but terminal is still saying I'm using python 2.7.12","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have looked for Python 2.7.12 in my apps and docs but I can't find it... \nI'm using a macbook pro.\nI can see Python 3.6 in my applications so I don't know why the terminal isn't referring to this one.  \nI want to get started learning django but I don't think it will be possible if I don't use Python 3.5 or later.  \nis there a way to tell the terminal to use 3.6 instead?","AnswerCount":4,"Available Count":4,"Score":0.049958375,"is_accepted":false,"ViewCount":2694,"Q_Id":44615007,"Users Score":1,"Answer":"Open the text editor like nano , vim or gedit and open the .bashrc file ,\nnano ~\/.bashrc\nand create the bash alias,\nTo do so add the following line into the .bashrc file:\nalias python='\/usr\/bin\/python3.6'\nSave the file and re-open the terminal.\nEdit:\nSimilarly, if you don't want to create the direct alias.\nAs @exprator suggested above you can also use python command for python 2 and python3 to use Python 3 version","Q_Score":0,"Tags":"python,django,macos,terminal,installation","A_Id":44615199,"CreationDate":"2017-06-18T12:33:00.000","Title":"Downloaded Python 3.6 but terminal is still saying I'm using python 2.7.12","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have looked for Python 2.7.12 in my apps and docs but I can't find it... \nI'm using a macbook pro.\nI can see Python 3.6 in my applications so I don't know why the terminal isn't referring to this one.  \nI want to get started learning django but I don't think it will be possible if I don't use Python 3.5 or later.  \nis there a way to tell the terminal to use 3.6 instead?","AnswerCount":4,"Available Count":4,"Score":0.0,"is_accepted":false,"ViewCount":2694,"Q_Id":44615007,"Users Score":0,"Answer":"By the way, you shouldn't use the default environment to develop. Instead, you have to use Virtualenv","Q_Score":0,"Tags":"python,django,macos,terminal,installation","A_Id":44618123,"CreationDate":"2017-06-18T12:33:00.000","Title":"Downloaded Python 3.6 but terminal is still saying I'm using python 2.7.12","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have looked for Python 2.7.12 in my apps and docs but I can't find it... \nI'm using a macbook pro.\nI can see Python 3.6 in my applications so I don't know why the terminal isn't referring to this one.  \nI want to get started learning django but I don't think it will be possible if I don't use Python 3.5 or later.  \nis there a way to tell the terminal to use 3.6 instead?","AnswerCount":4,"Available Count":4,"Score":0.049958375,"is_accepted":false,"ViewCount":2694,"Q_Id":44615007,"Users Score":1,"Answer":"Just use python in terminal for python 2.7 and type python3 to use python 3.6 when you need","Q_Score":0,"Tags":"python,django,macos,terminal,installation","A_Id":44615243,"CreationDate":"2017-06-18T12:33:00.000","Title":"Downloaded Python 3.6 but terminal is still saying I'm using python 2.7.12","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"I want to create a new cytoscape app for analysing protein interaction but I don't know if I can use python or just java.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":159,"Q_Id":44616799,"Users Score":0,"Answer":"Great question. This is within scope of this forum.\nThe answer is \"it depends\". Cytoscape apps themselves must be Java (or something that runs in JVM, though there's only documentation support for Java and the forums will give best advice for Java).\nHowever, the Cytoscape Cyberinfrastructure (CI) allows Python-based services (e.g., the Diffusion service) called by Cytoscape apps (e.g., the Diffusion app). The service must be deployed somewhere on the web (e.g., in a Kubernetes cluster). \nIf you'd like help with that route, you'll find enthusiastic support ... please e-mail the cytoscape-app-dev at googlegroups.com forum directly.","Q_Score":0,"Tags":"python,cytoscape","A_Id":45496273,"CreationDate":"2017-06-18T15:52:00.000","Title":"can I use python for create cytoscape app?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How do you change the model class name in Django without losing data?  Does anybody knows? Thank you very much to all for the help in advance.","AnswerCount":3,"Available Count":1,"Score":0.1325487884,"is_accepted":false,"ViewCount":1361,"Q_Id":44619977,"Users Score":2,"Answer":"If you just go ahead and change the model name in your models.py file, the \"makemigrations\" command is usually smart enough to pick it up. It will ask you if you changed the model name and create a migration to rename the table accordingly if you confirm.","Q_Score":3,"Tags":"python,django,django-models","A_Id":44621292,"CreationDate":"2017-06-18T22:04:00.000","Title":"How to change model class name without losing data?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I know there are several softwares for Django like Pycharm,etc. But I want to know can I run a webpage created by Django from Python IDLE. Is there any way if there is please help me.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1144,"Q_Id":44622868,"Users Score":0,"Answer":"Django is a web framework. you can not compile it, you can just write the code and then the browser will show the page you designed.\nyou can use Atom or Sublimetext for this purpose.test","Q_Score":0,"Tags":"python,django,python-idle","A_Id":44623832,"CreationDate":"2017-06-19T05:31:00.000","Title":"How to run django from python idle?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I know there are several softwares for Django like Pycharm,etc. But I want to know can I run a webpage created by Django from Python IDLE. Is there any way if there is please help me.","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":1144,"Q_Id":44622868,"Users Score":-1,"Answer":"IDLE and pycharm are development tools. When you run the code as webpage, you shouldn't use them.\nIn particular -- idle is an editor for one file at a time, while pycharm is better for project development.\nAny way, you can use any text editor for editing the python files.","Q_Score":0,"Tags":"python,django,python-idle","A_Id":44622927,"CreationDate":"2017-06-19T05:31:00.000","Title":"How to run django from python idle?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was wondering if it's possible to store an array in a Django model?\nI'm asking this because I need to store an array of int (e.g [1,2,3]) in a field and then be able to search a specific array and get a match with it or by it's possible combinations.\nI was thinking to store that arrays as strings in CharFields and then, when I need to search something, concatenate the values(obtained by filtering other model) with '[', ']' and ',' and then use a object filter with that generated string. The problem is that I will have to generate each possible combination and then filter them one by one until I get a match, and I believe that this might be inefficient.\nSo, I hope you can give me other ideas that I could try.\nI'm not asking for code, necessarily, any ideas on how to achieve this will be good.","AnswerCount":5,"Available Count":1,"Score":0.0798297691,"is_accepted":false,"ViewCount":103363,"Q_Id":44630642,"Users Score":2,"Answer":"I don't know why nobody has suggested it, but you can always pickle things and put the result into a binary field.\nThe advantages of this method are that it will work with just about any database, it's efficient, and it's applicable to more than just arrays.  The downside is that you can't have the database run queries on the pickled data (not easily, anyway).","Q_Score":52,"Tags":"python,arrays,django","A_Id":61437282,"CreationDate":"2017-06-19T12:30:00.000","Title":"Is it possible to store an array in Django model?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm building exchange rate app and using Firebase as datastore.\nOn previous version 1 did store rates' data in string and convert string to BigDecimal on Android device for calculation.\nNow, while I'm working on version 2 I decided to review code and make updates. I found solution to store rates' data in Integer type than convert back to Decimal\/Double\/Float.\nFlow:\nBackend Python -> dataTostore = int(currency rate value * 100)\nAndroid Java -> rateValue = dataToStore \/ 100.00\nAny experience with this problem ?\nHow to solve it OR using string-BigDecimal good enough ?\nThanks.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1268,"Q_Id":44632272,"Users Score":0,"Answer":"Storing monetary values in counts of the smallest denomination is a common practice. It ensures that you can always count full values and reduces the risk of rounding errors associated with floating point types.\nWhether an integer type is enough depends on the maximum value you want to store. \nFirebase Database internally supports signed 64-bit longs (-2^63 ... 2^63-1).  Note that JavaScript uses 64-bit double values internally so some large integers (greater than 2^53) are not precisely representable and will lose precision.","Q_Score":3,"Tags":"java,python,firebase,firebase-realtime-database","A_Id":44632746,"CreationDate":"2017-06-19T13:43:00.000","Title":"Firebase - store currency type value","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm not able anymore to change my database on arangodb.\nIf I try to create a collection I get the error: \n\nCollection error: cannot create collection: invalid database directory\n\nIf I try to delete a collection I get the error: \n\nCouldn't delete collection.\n\nBesides that some of the collections are now corrupted.\nI've been working with this db for 2 months and I'm only getting these errors now.\nThanks.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":111,"Q_Id":44632365,"Users Score":1,"Answer":"If anyone gets the same error anytime in life, it was just a temporary error due to server overload.","Q_Score":1,"Tags":"python,arangodb","A_Id":44649139,"CreationDate":"2017-06-19T13:47:00.000","Title":"Python ArangoDB","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Scenario: A User registers to my Wagtail site. This creates a Group, and a Page. This page wil be set Private 'Private, accessible to users in specific groups' The just created group will be set.\nThe user invites people to the group, and shares pages as childpages of the just created root-page, so only group members can acces it.\nWould this scale? For like, hopefully, thousands of groups? Is this a way to separate content for a SAAS setup?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":254,"Q_Id":44644596,"Users Score":0,"Answer":"Yes, that should work - I can't think of any issues that would prevent that approach from scaling to thousands of groups.\nHowever, be aware that Wagtail doesn't currently provide complete isolation between sub-sites on the same Wagtail installation - users will still be able to see pages from other groups when they're choosing a page to link to.","Q_Score":0,"Tags":"python,django,wagtail","A_Id":44649905,"CreationDate":"2017-06-20T05:35:00.000","Title":"Wagtail Page Privacy 'Private, accessible to users in specific groups' as SAAS separation","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My json file is in the same directory of view.py file.\nHowever, when I open the html in browser, the IO error happens.\nWhen I run view.py through pycharm, it works fine.\nThe JSon file is a database configuretion file. I want to display some data from the databse in that case I need to connect to database first.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1550,"Q_Id":44647376,"Users Score":0,"Answer":"if you need to see the JSON file via browser, you need to put it in the static folder.","Q_Score":0,"Tags":"django,python-2.7,django-templates,django-views","A_Id":44648315,"CreationDate":"2017-06-20T08:09:00.000","Title":"Django app can not find json file in the same directory","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"My json file is in the same directory of view.py file.\nHowever, when I open the html in browser, the IO error happens.\nWhen I run view.py through pycharm, it works fine.\nThe JSon file is a database configuretion file. I want to display some data from the databse in that case I need to connect to database first.","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":1550,"Q_Id":44647376,"Users Score":2,"Answer":"With the information provided, it is really hard to give you a good answer.\nHowevr, I assume, that you run your view in PyCharm by actually running views.py instead of using the runserver command? In this case, the execution directory is the folder of your app and a relative path to the JSON file can be resolved.\nAs soon as you run a development or real server and access the view in the browser using its URL, the execution directory is the firectory of the manage.py file (the root folder of your project). If you just access the name of your JSON file, then it cannot be found, since you are searching it in the wrong folder.\nWhat are you using the JSON file for? If it should be available in the web borwser as well (as a resource for e.g. JavaScript), then you may want to put it into the static folder of your app or project (remember to run manage.py collectstatic then). In this case, the STATIC_ROOT would be defined in settings.py and you could resolve the path from there (using os.path.join(STATIC_ROOT, \"path to json file\") )","Q_Score":0,"Tags":"django,python-2.7,django-templates,django-views","A_Id":44648366,"CreationDate":"2017-06-20T08:09:00.000","Title":"Django app can not find json file in the same directory","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"nameko run --config .\/foobar.yaml my_app\nthe above line defaults to to running my_app with python2. can I change it to python3? the documentation doesn't show this option but considering you get get nameko with pip3 it sounds reasonable.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":232,"Q_Id":44647687,"Users Score":1,"Answer":"Yes, Nameko works with Python 3.\nYou just need to execute nameko run in an environment where Python 3 is the default (or only) interpreter.","Q_Score":1,"Tags":"python-3.x,nameko","A_Id":44650675,"CreationDate":"2017-06-20T08:25:00.000","Title":"can nameko use python3?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it possible to share data between queues in stomp? We have a new project and my task is pass data from one queue to another. Consider a system with ActiveMQ and Stomp. In this system I have find a message that return by queue1 and pass to queue2. This doesn't make much sense to me. Any advice about this issue would be appreciated.\nUse Case:\nI have an application like this:\n\nqueue1 : make query from ldap and find user\nqueue2 : make query from exchange server with given user\n\nI want to use \"user\" founded from queue1 for query in queue2","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":50,"Q_Id":44648000,"Users Score":0,"Answer":"Yes, you can move messages between queues within the same broker, or across brokers.\nSame broker use case: \nApplication sends message to queue1 on brokerA. Using ActiveMQ's Composite Destination support, you could configure brokerA to also deliver the message to queue2 on brokerA.\nDifferent broker use case: \nApplication sends message to queue1 on brokerA, the messages are then passed queue2 on brokerB using a bridge, or an ActiveMQ network connector.\nAdditionally, code could read a message from queue1 on brokerA, perform some processing and then publish the message to queue2 on brokerB.\nAs Tim mentioned in his comment, additional detail identifying which use case applies to you is needed in order to recommend the best solution.","Q_Score":0,"Tags":"python,activemq,message-queue,stomp","A_Id":44658880,"CreationDate":"2017-06-20T08:40:00.000","Title":"Pass data between queues - Stomp","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using google cloudSQL for applying advance search on people data to fetch the list of users. In datastore, there are data already stored there with 2 model. First is used to track current data of users and other model is used to track historical timeline. The current data is stored on google cloudSQL are more than millions rows for all users. Now I want to implement advance search on historical data including between dates by adding all history data to cloud.  \nIf anyone can suggest the better structure for this historical model as I've gone through many of the links and articles. But cannot find proper solution as I have to take care of the performance for search (In Current search, the time is taken to fetch result is normal but when history is fetched, It'll scan all the records which causes slowdown of queries because of complex JOINs as needed). The query that is used to fetch the data from cloudSQL are made dynamically based on the users' need. For example, A user want the employees list whose manager is \"xyz.123@abc.in\" , by using python code, the query will built accordingly. Now a user want to find users whose manager WAS \"xyz.123@abc.in\" with effectiveFrom 2016-05-02 to 2017-01-01.\nAs I've find some of the usecases for structure as below:\n1) Same model as current structure with new column flag for isCurrentData (status of data whether it is history or active)\nDisadv.:\n - queries slowdown while fetching data as it will scan all records.\n   Duplication of data might increase.\nThese all disadv. will affect the performance of advance search by increasing time.\n    Solution to this problem is to partition whole table into diff tables.\n2) Partition based on year.\n   As time passes, this will generate too many tables.\n3) 2 tables might be maintained.\n   1st for current data and second one for history. But when user want to search data on both models will create complexity of build query.\nSo, need suggestions for structuring historical timeline with improved performance and effective data handling.\nThanks in advance.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":81,"Q_Id":44654127,"Users Score":0,"Answer":"@Kevin Malachowski : Thanks for guiding me with your info and questions as It gave me new way of thinking. \nHistorical data records will be more than 0.3-0.5 million(maximum). Now I'll use BigQuery for historical advance search.\nFor live data-cloudSQL will be used as we must focus on perfomance for fetched data.\nSome of performance issue will be there for historical search, when a user wants both results from live as well as historical data. (BigQuery is taking time near about 5-6 sec[or more] for worst case) But it will be optimized as per data and structure of the model.","Q_Score":1,"Tags":"python,google-app-engine,google-cloud-sql","A_Id":44715500,"CreationDate":"2017-06-20T13:14:00.000","Title":"Google CloudSQL : structuring history data on cloudSQL","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm using google cloudSQL for applying advance search on people data to fetch the list of users. In datastore, there are data already stored there with 2 model. First is used to track current data of users and other model is used to track historical timeline. The current data is stored on google cloudSQL are more than millions rows for all users. Now I want to implement advance search on historical data including between dates by adding all history data to cloud.  \nIf anyone can suggest the better structure for this historical model as I've gone through many of the links and articles. But cannot find proper solution as I have to take care of the performance for search (In Current search, the time is taken to fetch result is normal but when history is fetched, It'll scan all the records which causes slowdown of queries because of complex JOINs as needed). The query that is used to fetch the data from cloudSQL are made dynamically based on the users' need. For example, A user want the employees list whose manager is \"xyz.123@abc.in\" , by using python code, the query will built accordingly. Now a user want to find users whose manager WAS \"xyz.123@abc.in\" with effectiveFrom 2016-05-02 to 2017-01-01.\nAs I've find some of the usecases for structure as below:\n1) Same model as current structure with new column flag for isCurrentData (status of data whether it is history or active)\nDisadv.:\n - queries slowdown while fetching data as it will scan all records.\n   Duplication of data might increase.\nThese all disadv. will affect the performance of advance search by increasing time.\n    Solution to this problem is to partition whole table into diff tables.\n2) Partition based on year.\n   As time passes, this will generate too many tables.\n3) 2 tables might be maintained.\n   1st for current data and second one for history. But when user want to search data on both models will create complexity of build query.\nSo, need suggestions for structuring historical timeline with improved performance and effective data handling.\nThanks in advance.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":81,"Q_Id":44654127,"Users Score":0,"Answer":"Depending on how often you want to do live queries vs historical queries and the size of your data set, you might want to consider placing the historical data elsewhere.\nFor example, if you need quick queries for live data and do many of them, but can handle higher-latency queries and only execute them sometimes, you might consider periodically exporting data to Google BigQuery. BigQuery can be useful for searching a large corpus of data but has much higher latency and doesn't have a wire protocol that is MySQL-compatible (although it's query language will look familiar to those who know any flavor of SQL). In addition, while for Cloud SQL you pay for data storage and the amount of time your database is running, in BigQuery you mostly pay for data storage and the amount of data scanned during your query executions. Therefore, if you plan on executing many of these historical queries it may get a little expensive.\nAlso, if you don't have a very large data set, BigQuery may be a bit of an overkill. How large is your \"live\" data set and how large do you expect your \"historical\" data set to grow over time? Is it possible to just increase the size of the Cloud SQL instance as the historical data grows until the point at which it makes sense to start exporting to Big Query?","Q_Score":1,"Tags":"python,google-app-engine,google-cloud-sql","A_Id":44662852,"CreationDate":"2017-06-20T13:14:00.000","Title":"Google CloudSQL : structuring history data on cloudSQL","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I've read that it's best practice for security reason to store things like API keys in the instance\/settings.py file in Flask - why is this so and what is the mechanism that makes it so. I haven't been able to find much documentation about this online.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":49,"Q_Id":44659458,"Users Score":0,"Answer":"As @davidism suggested, Config files are never meant to be tracked since these are your secret keys and anybody with access to your code will have access to your keys if tracked.\nBut, there is no hard and fast rule in Flask to keep your settings file in a specific location. You can keep them anywhere and name them anything.\nBut, when adding the config to the app, the correct file path must be given.","Q_Score":0,"Tags":"python,flask","A_Id":44661281,"CreationDate":"2017-06-20T17:24:00.000","Title":"Why is more secure to store sensitive settings in instance settings instead config settings in Flask?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to create a web app for my company that functions like a tool suite for non-technical employees to use. I'm using\nPython\nSelenium WebDriver,\nBeautifulSoup,\nSrapy,\nDjango\nIs it possible and is this the right approach?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":322,"Q_Id":44668401,"Users Score":1,"Answer":"\"The idea is to create a variety of methods that can be run by\n  clicking a button and\/or inserting content in inputs, and having the\n  tests \/ functions run and returning the specified results.\"\n\nMaybe Flask can help you here. It has a nice functionality to route urls to specific functions or methods in your code. It provides a convenient way to bind actions to code. You can search the web for how you can leverage Flask to cater to your specific needs, but here I just wanted to convey that it would help.","Q_Score":0,"Tags":"python,django,selenium,beautifulsoup,scrapy","A_Id":44668515,"CreationDate":"2017-06-21T06:32:00.000","Title":"Selenium \/ Web crawling \/ Web scraping App in Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was trying to set background image in my website \nbut in style.css file is not visible it has this error is \"Cannot reslove directory 'Images'\nCSS:\nbackground: white url(\"images\/one.png\") no-repeat right bottom;\nindex.html:\n{% load staticfiles %}\n <link rel=\"stylesheet\" type=\"text\/css\" href=\"{% static 'music\/style.css' %}\"\/>\nI want to select image from music\/images\/one.png\nThanks is advance","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":128,"Q_Id":44669297,"Users Score":1,"Answer":"I don't know your folder layout, however have you tried providing it with the full URL to the file? If that doesn't work, provided it's sensible for your folder structure you can try relative paths, for instance \"..\/images\/one.png\"","Q_Score":0,"Tags":"python,html,css,django","A_Id":44669492,"CreationDate":"2017-06-21T07:19:00.000","Title":"Background image add in website in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Self explanatory question here.\nIs this even possible? Can't find any documentation regarding this anywhere.. \nAnd if not, how complicated is it to write a plugin?\nThanks!","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":219,"Q_Id":44671776,"Users Score":1,"Answer":"pytest is not currently in the test framework like JUnit is but since you have a command line you could run your tests manually or create a custom command from the commands tab on the left. \n\nclick the \"+\" under \"TEST\"\nreplace the \"Command Line\" entry that reads echo \"hello\" with \npython ${current.project.relpath}\nclick save\nWith your python test file selected in the Project Explorer, click run on your new custom test shift+F10.","Q_Score":0,"Tags":"python,pytest,codenvy,eclipse-che","A_Id":44780474,"CreationDate":"2017-06-21T09:16:00.000","Title":"Is it possible to run Py.Test tests on Eclipse Che\/Codenvy?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Self explanatory question here.\nIs this even possible? Can't find any documentation regarding this anywhere.. \nAnd if not, how complicated is it to write a plugin?\nThanks!","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":219,"Q_Id":44671776,"Users Score":0,"Answer":"Correct, there's no built in UI to run python tests. However, you may use command line approach.","Q_Score":0,"Tags":"python,pytest,codenvy,eclipse-che","A_Id":45098100,"CreationDate":"2017-06-21T09:16:00.000","Title":"Is it possible to run Py.Test tests on Eclipse Che\/Codenvy?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I edited my dispatch.yaml and deployed on app engine using\n appcfg.py update_dispatch .\nBut when I go and see source code under StackDriver debug, I don't see the change.\nWhy the changes doesn't get reflected. But when I deploy complete app by appcfg.py update . the changes get reflected.\nBut in case, If I only want to update dispatch how do I do???","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":306,"Q_Id":44698229,"Users Score":1,"Answer":"Try\n\ngcloud app deploy dispatch.yaml\n\n...to connect services to dispatch rules.","Q_Score":0,"Tags":"python,google-app-engine","A_Id":62299368,"CreationDate":"2017-06-22T11:33:00.000","Title":"dispatch.yaml not getting updated","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm looking for ways to scrape all tables on a certain website. The tables are formatted exactly the same in all subpages. The problem is, the urls of those subpages are in this way:\nurl1 = 'http...\/Tom',\nurl2 = 'http...\/Mary',\nurl3 = 'http...\/Jason', such that I cannot set a loop by altering the url incrementally. Are there any possible ways to solve this by pandas?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":424,"Q_Id":44703138,"Users Score":0,"Answer":"Another idea would be to use BeautifulSoup library first and get all the table elements from a webpage and then apply pd.read_html()","Q_Score":0,"Tags":"python,pandas,beautifulsoup","A_Id":44703767,"CreationDate":"2017-06-22T15:05:00.000","Title":"Is it possible to use pandas to scrape html tables over multiple web pages?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"PROBLEM\nEven after installation of django, typing the command django-admin --version shows up the message failed to create the process.\nwhat I've done\n\nI have installed python version3.6.1 ,pip version 9.0.1 ,easy_install version28.0.1 and then installed django version 1.9 using easy_install. \nIn the Environment variables of mycomputer I've set the PATH both to python folder and the scripts folder.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":83,"Q_Id":44703243,"Users Score":0,"Answer":"Finally got the hang .The problem is with windows , not the installation process. For the same task the commands doesn't remain the same in everyone's case as changing the command from django-admin --version to C:>path to installation directory>python django-admin-script.py --version from the script directory worked in my case.","Q_Score":0,"Tags":"python,django","A_Id":44719815,"CreationDate":"2017-06-22T15:09:00.000","Title":"django1.9 after installation is not recognised by the command prompt","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working on a flask API, which one of the endpoint is to receive a message and publish it to PubSub. Currently, in order to test that endpoint, I will have to manually spin-up a PubSub emulator from the command line, and keep it running during the test. It working just fine, but it wouldn't be ideal for automated test. \nI wonder if anyone knows a way to spin-up a test PubSub emulator from python? Or if anyone has a better solution for testing such an API?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":768,"Q_Id":44708430,"Users Score":0,"Answer":"This is how I usually do:\n1. I create a python client class which does publish and subscribe with the topic, project and subscription used in emulator.\nNote: You need to set PUBSUB_EMULATOR_HOST=localhost:8085 as env in your python project.\n2. I spin up a pubsub-emulator as a docker container.\nNote: You need to set some envs, mount volumes and expose port 8085.\nset following envs for container:\n\nPUBSUB_EMULATOR_HOST\nPUBSUB_PROJECT_ID\nPUBSUB_TOPIC_ID\nPUBSUB_SUBSCRIPTION_ID\n\n\nWrite whatever integration tests you want to. Use publisher or subscriber from client depending on your test requirements.","Q_Score":1,"Tags":"python,google-cloud-platform,google-cloud-pubsub","A_Id":64239668,"CreationDate":"2017-06-22T20:03:00.000","Title":"How to boot up a test pubsub emulator from python for automated testing","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am trying to learn Python from an online course that I purchased.  The instructor uses IntelliJ IDEA as an IDE and since I am trying to follow along I am trying to use it as well.  When I download IntelliJ IDEA and then try to open it I receive the following error message: \"No JVM Installation found.  Please install a 32 bit JDK.  If you already have a JDK installed, define a JAVA_Home variable in COmputer>System Properties>System Settings>Environmental Variables\"\nI tried googling the issue and found my way to the Oracle website where they offered JDK downloads.  However there was no 32bit windows version available.\n\nWhat is a JDK?\nWhy do I need a JDK for Python development?\nHow can I download a 32 bit version of JDK?\nWhat is an easy to learn IDE for Python?  I've tried Visual Studio Code and PyCharm and have had issues with the set up of both and have not found many helpful articles\/videos.\n\nThank you!","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":7803,"Q_Id":44709252,"Users Score":1,"Answer":"Open the root folder. And you should find the 64 bits version in it. You can then create a short cut for that.You should be fine.","Q_Score":2,"Tags":"python,intellij-idea,ide","A_Id":49150590,"CreationDate":"2017-06-22T20:55:00.000","Title":"Error Launching IDEA: No JVM Installation Found","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a basic personal project website that I am looking to learn some web dev fundamentals with and database (SQL) fundamentals as well (If SQL is even the right technology to use??).\nI have the basic skeleton up and running but as I am new to this, I want to make sure I am doing it in the most efficient and \"correct\" way possible.\nCurrently the site has a main index (landing) page and from there the user can select one of a few subpages. For the sake of understanding, each of these sub pages represents a different surf break and they each display relevant info about that particular break i.e. wave height, wind, tide. \nAs I have already been able to successfully scrape this data, my main questions revolve around how would I go about inserting this data into a database for future use (historical graphs, trends)? How would I ensure data is added to this database in a continuous manner (once\/day)? How would I use data that was scraped from an earlier time, say at noon, to be displayed\/used at 12:05 PM rather than scraping it again?\nAny other tips, guidance, or resources you can point me to are much appreciated.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":181,"Q_Id":44714345,"Users Score":2,"Answer":"This kind of data is called time series. There are specialized database engines for time series, but with a not-extreme volume of observations - (timestamp, wave heigh, wind, tide, which break it is) tuples - a SQL database will be perfectly fine.\nTry to model your data as a table in Postgres or MySQL. Start by making a table and manually inserting some fake data in a GUI client for your database. When it looks right, you have your schema. The corresponding CREATE TABLE statement is your DDL. You should be able to write SELECT queries against your table that yield the data you want to show on your webapp. If these queries are awkward, it's a sign that your schema needs revision. Save your DDL. It's (sort of) part of your source code. I imagine two tables: a listing of surf breaks, and a listing of observations. Each row in the listing of observations would reference the listing of surf breaks. If you're on a Mac, Sequel Pro is a decent tool for playing around with a MySQL database, and playing around is probably the best way to learn to use one.\nNext, try to insert data to the table from a Python script. Starting with fake data is fine, but mold your Python script to read from your upstream source (the result of scraping) and insert into the table. What does your scraping code output? Is it a function you can call? A CSV you can read? That'll dictate how this script works.\nIt'll help if this import script is idempotent: you can run it multiple times and it won't make a mess by inserting duplicate rows. It'll also help if this is incremental: once your dataset grows large, it will be very expensive to recompute the whole thing. Try to deal with importing a specific interval at a time. A command-line tool is fine. You can specify the interval as a command-line argument, or figure out out from the current time.\nThe general problem here, loading data from one system into another on a regular schedule, is called ETL. You have a very simple case of it, and can use very simple tools, but if you want to read about it, that's what it's called. If instead you could get a continuous stream of observations - say, straight from the sensors - you would have a streaming ingestion problem.\nYou can use the Linux subsystem cron to make this script run on a schedule. You'll want to know whether it ran successfully - this opens a whole other can of worms about monitoring and alerting. There are various open-source systems that will let you emit metrics from your programs, basically a \"hey, this happened\" tick, see these metrics plotted on graphs, and ask to be emailed\/texted\/paged if something is happening too frequently or too infrequently. (These systems are, incidentally, one of the main applications of time-series databases). Don't get bogged down with this upfront, but keep it in mind. Statsd, Grafana, and Prometheus are some names to get you started Googling in this direction. You could also simply have your script send an email on success or failure, but people tend to start ignoring such emails.\nYou'll have written some functions to interact with your database engine. Extract these in a Python module. This forms the basis of your Data Access Layer. Reuse it in your Flask application. This will be easiest if you keep all this stuff in the same Git repository. You can use your chosen database engine's Python client directly, or you can use an abstraction layer like SQLAlchemy. This decision is controversial and people will have opinions, but just pick one. Whatever database API you pick, please learn what a SQL injection attack is and how to use user-supplied data in queries without opening yourself up to SQL injection. Your database API's documentation should cover the latter.\nThe \/ page of your Flask application will be based on a SQL query like SELECT * FROM surf_breaks. Render a link to the break-specific page for each one.\nYou'll have another page like \/breaks\/n where n identifies a surf break (an integer that increments as you insert surf break rows is customary). This page will be based on a query like SELECT * FROM observations WHERE surf_break_id = n. In each case, you'll call functions in your Data Access Layer for a list of rows, and then in a template, iterate through those rows and render some HTML. There are various Javascript and Python graphing libraries you can feed this list of rows into and get graphs out of (client side or server side). If you're interested in something like a week-over-week change, you should be able to express that in one SQL query and get that dataset directly from the database engine.\nFor performance, try not to get in a situation where more than one SQL query happens during a page load. By default, you'll be doing some unnecessary work by going back to the database and recomputing the page every time someone requests it. If this becomes a problem, you can add a reverse proxy cache in front of your Flask app. In your case this is easy, since nothing users do to the app cause its content to change. Simply invalidate the cache when you import new data.","Q_Score":0,"Tags":"python,sql,web,flask","A_Id":44715054,"CreationDate":"2017-06-23T06:20:00.000","Title":"Flask website backend structure guidance assistance?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've seen a few posts on this topic with odd hard to reproduce behaviours. Here's a new set of data points.\n\nCurrently the following works\n\ncd .\/hosts\n.\/ec2.py --profile=dev\n\n\nAnd this fails\n\nAWS_PROFILE=dev; ansible-playbook test.yml\nThese were both working a couple days ago.  Something in my environment changed. Still investigating. Any guesses?\nError message:\nERROR! The file .\/hosts\/ec2.py is marked as executable, but failed to execute correctly. If this is not supposed to be an executable script, correct this withchmod -x .\/hosts\/ec2.py.\nERROR! Inventory script (.\/hosts\/ec2.py) had an execution error: ERROR: \"Error connecting to AWS backend.\nYou are not authorized to perform this operation.\", while: getting EC2 instances\nERROR! .\/hosts\/ec2.py:3: Error parsing host definition ''''': No closing quotation\n\nNote that the normal credentials error is:\nERROR: \"Error connecting to AWS backend.\nYou are not authorized to perform this operation.\", while: getting EC2 instances\n...\nHmmm. Error message has shifted. \n\nAWS_PROFILE=dev; ansible-playbook test.yml\nERROR! ERROR! .\/hosts\/tmp:2: Expected key=value host variable assignment, got: {","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1445,"Q_Id":44737529,"Users Score":0,"Answer":"Looks like the problem was a temporary file in the hosts folder.  After removing it the problems went away.  It looks like std ansible behaviour: Pull in ALL files in the hosts folder.","Q_Score":0,"Tags":"python,amazon-ec2,ansible","A_Id":44737817,"CreationDate":"2017-06-24T14:36:00.000","Title":"Ansible ec2.py runs standalone but fails in playbook","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Ok so I'm hosting a Django EC2 instance right now using ngrok http 8000 and leaving it running. It's doing fine but a lot of browsers are blocking the traffic to my site. I need to make my reserved domain (I have some on Amazon and some on 1 and 1) to my 123.4.5.67:8000 public IPv4 IP or just my public IPv4 DNS on my EC2.\nWhat I need in a nutshell is example.com to redirect to 123.4.5.67:8000 while still saying example.com in the url.\nSo far I have heard of Apache, WSGI, and nginx. None of them have worked for me, but maybe I haven't gotten the right direction.\nPlease help!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":47,"Q_Id":44741368,"Users Score":0,"Answer":"I\u2019m pretty sure that you need to make this change wherever you host your domain. The only way i was able to do this with my personal server was to point to port 80instead of 8000","Q_Score":0,"Tags":"python,django,amazon-web-services,nginx,amazon-ec2","A_Id":44742316,"CreationDate":"2017-06-24T22:05:00.000","Title":"How do I point my reserved domain to a Django EC2 instance?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Just wondering if anyone could explain why I navigate to a webpage using Chrome and the request headers include Accept, Accept-Encoding, Accept-Language, Connection, Cookie, Host, Referer, Upgrade-Insecure-Request, and User-Agent but when I make a request via Python and print request.headers it only returns Connection, Accept-Encoding, Accept, and User-Agent even if I set the User-Agent to the same one I see in Chrome. Also I'm wondering if it's possible to return those request headers I see in Chrome rather than those I see in Python. Thank you.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":498,"Q_Id":44742686,"Users Score":0,"Answer":"Your using two different libraries (Chrome's internal http library and requests). It's very rare for two unrelated libraries to send the same set of headers, especially when one is from a browser. You could manually set those headers in requests but I'm not sure what you're trying to do","Q_Score":0,"Tags":"python,python-2.7,google-chrome,python-requests,request-headers","A_Id":44744069,"CreationDate":"2017-06-25T02:35:00.000","Title":"Python request.headers differs from what I see in Chrome","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm in the process of delving into Django into a little more depth - and I now have certain blocks around my website which are recycled, but not necessarily suited to a being placed in base.html and then sprinkled with {% extends \/root\/to\/base.html %}.\nSo, I have a bespoke widget I have created which is utilised on certain pages but in different configurations, is it best to register and inclusion tag and reference the template you want to accompany those stored variables and arrays\/lists\/dictionaries etc..\nFor me it seems easier to define tags and then dot these around where I need them and just make edits to the template that is registered with that tag method? But is this the accepted Django standard?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":36,"Q_Id":44758375,"Users Score":2,"Answer":"In Django \n\na \"view\" is a callable that is responsible for handling a request and returning a response, \na template tag is a piece of code that will be executed in the context of rendering a template and will either push something in the template's context or render some text or markup.\n\nOranges and apples, really, and it should be quite clear when you want a view and when you want a template tag. \nAnd yes, using inclusion tags (or a full-blown custom tag using a template to render some data) is \"an accepted Django standard\" - actually that's exactly what template tags are for.","Q_Score":2,"Tags":"python,django,django-templates,django-views","A_Id":44759403,"CreationDate":"2017-06-26T11:09:00.000","Title":"Best Django practise - when to use views and when to use tags","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I noticed that whenever you type comma in integer field, odoo (or python) automatically removes that comma and merges numbers (for example whenever you type 1,3 it will become 13). If I type 1.3 or 1;3 etc. everything is fine. Probably I could do something like @api.constrains for a field, but how I could fix this for whole system?\nThank you for your time considering my question.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":741,"Q_Id":44774814,"Users Score":0,"Answer":"This depends on the language the user has chosen. Under Settings\/Translations\/Languages (in newer versions of Odoo you first need to activate developer mode to see this menu) chose a language and look into \"Thousands Separator\" and \"Decimal Separator\".\nFor example using German language it's the other way around, because we use comma as decimal separator and dot as thousands separator.\nSo nothing to program here, it's just a configuration issue.","Q_Score":0,"Tags":"python,openerp,odoo-8,odoo-9,odoo-10","A_Id":44778932,"CreationDate":"2017-06-27T07:45:00.000","Title":"How to prevent user from saving comma at integer field in whole Odoo system?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I wanna migrate from sqlite3 to MySQL in Django. Now I have been working in Oracle, MS Server and I know that I can make Exception to try over and over again until it is done... However this is insert in a same table where the data must be INSERTED right away because users will not be happy for waiting their turn on INSERT on the same table.\nSo I was wondering, will the deadlock happen on table if to many users make insert in same time and what should I do to bypass that, so that users don't sense it?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":397,"Q_Id":44789046,"Users Score":1,"Answer":"I don't think you can get deadlock just from rapid insertions. Deadlock occurs when you have two processes that are each waiting for the other one to do something before they can make the change that the other one is waiting for. If two processes are just inserting, the database will simply process them in the order that they're received, there's no dependency between them.\nIf you're using InnoDB, it uses row-level locking. So unless two inserts both try to insert the same unique key, they shouldn't even lock each other out, they can be done concurrently.","Q_Score":1,"Tags":"python,mysql,django","A_Id":44789450,"CreationDate":"2017-06-27T20:10:00.000","Title":"MySql: will it deadlock on to many insert - Django?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have B* instances running on App Engine(Python env) to serve user facing requests. Sometimes I see B* instances getting terminated due to Exceeded soft private memory limit \nI understand that increasing the instance class will solve the issue but\nI have few queries regarding requests that are present in the Instance Pending Queue !\nAssume we have 2 instances of B* instance class and we call it let say => I-1, I-2  \n\nWhat will happen to those requests that are there in I-1 Instance Request Pending Queue after the I-1 instance gets terminated due to some reason? Will those requests gets evicted from the instance queue as this instance got terminated ?\nWill the requests in Instance Pending Queue are Dequeued from the Instance Pending Queue for I-1 and will be put in I-2 Request Queue by the Request scheduler as soon as Request Scheduler finds that I-1 is shutting down due to some reason.\n\nAny help regarding understanding these things will be highly appreciated !","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":34,"Q_Id":44795589,"Users Score":1,"Answer":"Based on my external observations of how things work, I suspect there is only a single ingress queue (per service\/module) from which requests are only handed to instances which can immediately handle them.\nThe actual parameters of this single queue (depth, waiting time, etc) would be the indicators driving the automatic\/basic instance scaling logic for that service\/module - starting and stopping instances.\nIn such architecture the death of an instance has absolutely no impact on the queued requests, they would simply be dispatched to other instance(s), either already running or specifically started to handle such request.\nNote: this is just a theory, though.","Q_Score":0,"Tags":"python,google-app-engine,google-cloud-platform","A_Id":44805435,"CreationDate":"2017-06-28T06:58:00.000","Title":"What happens to requests in Instance Request Pending Queue when a backend instance gets terminated due to \"Exceeded soft private memory limit\"?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a python script that collects data on some virtual machines. I want to display this data in a webpage.The web page must be dynamic since the script will run continuously and the data must be updated every time the script runs. I possibly want this data displayed in a table but I am not sure what direction to go?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":653,"Q_Id":44804099,"Users Score":1,"Answer":"You could use Apache or another web server. Set up an HTML web page with javascript. I recommend using jQuery as it makes making ajax calls so much easier. Have your javascript\/ajax\/jquery call your python script every x minutes\/seconds.\nEnsure your apache server is setup to run CGI scripts and ensure they are set with read and execute permissions.","Q_Score":0,"Tags":"python,html,database,webpage","A_Id":44804332,"CreationDate":"2017-06-28T13:36:00.000","Title":"Best way to display python script data in a webpage?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I  am trying to create a model via a form that has multiple other models related to it. Say I have a model Publisher, then another model Article with a foreign key to Publisher. When creating a Publisher via a form, I want to create An article at the same time. I know how to do this via formsets. However, I don't know how to add a button that says add extra article at the same view, without having to be redirected to a new page and losing the old data since the form was not saved. What I want is when someone clicks add new article, for a new form for article to appear and for the user to add a new Article. Is this possible to be done in the same view in django, if so can someone give me and idea how to approach this?\nI would show code or my attempts, but I am not sure how to even approach it.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":56,"Q_Id":44810259,"Users Score":0,"Answer":"This can only be done using JavaScript. The hard part is to have the management form sync up with the number of rows.\nBut there's two alternatives:\n\nSemi-javascript (Mezzanine's approach): Generate a ton of rows in the formset and only show one empty. Upon the click of the \"add another row\" button, unhide the next one. This makes it easier to handle the management form as the unfilled extra's don't need any work.\nNo fix needed: Add as many rows as is humanly sane. In general, people don't need 40 rows, they get bored with filling out the form or worry that all that work is lost when the browser crashes.\n\nHope this helps you along. Good luck!","Q_Score":1,"Tags":"python,django,forms","A_Id":44810611,"CreationDate":"2017-06-28T18:42:00.000","Title":"Option to add extra choices in django form","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"What is the difference between get_context_data and queryset in Django generic views? They seem to do the same thing?","AnswerCount":3,"Available Count":1,"Score":0.2605204458,"is_accepted":false,"ViewCount":3102,"Q_Id":44823132,"Users Score":4,"Answer":"These are completely different things.\nget_context_data() is used to generate dict of variables that are accessible in template. queryset is Django ORM queryset that consists of model instances\nDefault implementation of get_context_data() in ListView adds return value of get_queryset() (which simply returns self.queryset by default) to context as objects_list variable.","Q_Score":4,"Tags":"python,django,django-views,django-generic-views","A_Id":44823316,"CreationDate":"2017-06-29T10:51:00.000","Title":"Diference between get_context_data and queryset in Django generic views?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to provide REST interface and a single page JS-application for consuming the REST-service. Is there a way to do both in one python app or should I start eve-app for providing REST and flask-app for providing HTML as two processes?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":806,"Q_Id":44825336,"Users Score":1,"Answer":"If your flask app is only for serving static files, you don't even need a flask app. You may be able to directly serve static assets via Nginx","Q_Score":1,"Tags":"python,flask,eve","A_Id":44917195,"CreationDate":"2017-06-29T12:36:00.000","Title":"Using Eve and Flask in one application","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a python script that continuously generates JSON object \n{ time: \"timestamp\", behaviour: 'random behaviour'} and display it on stdout.\nNow I want to build a web app and modify the script so that I can read continous data to my web page. I donno where to start from.\nWell in details: I want a web API to have an on\/off button and by clicking on it start reading the beahviour and on clicking off it stops. \nI am very new to programming so please suggest me topics and ways I need to study\/ look upon to make this app.\nthanks","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":38,"Q_Id":44829186,"Users Score":0,"Answer":"Here's a simple way I'd go about doing it:\n\nCreate a backend service that exposes the python script's output via HTTP.  You can use any familiar backend programming language: python, java, .net etc to host a simple http web server, and expose the data.\nCreate a simple html page, that makes an ajax call to your backend service, pulls the data, and shows it on the page.\nLater add your buttons, make the page nicer, responsive on other devices.\n\nTopics to read depends on what you are missing above.  My best guess based on your question is that you are not familar with front end programming.  So read up on html, js, css and ajax.","Q_Score":0,"Tags":"python,rest,reactjs,web-applications,websocket","A_Id":44830106,"CreationDate":"2017-06-29T15:21:00.000","Title":"Web App to read data continously from another app","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a myList list with e.g. 5 elements, but I want to slice it in template by using command:\n{% for item in myList|slice:\"3\" %}\nor this command:\n{% for item in myList|slice:\":3\" %}\nWhat's the difference between slice:\"x\" and slice:\":x\"? (I don't have currently access to machine with django installed but I'm curious)","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":544,"Q_Id":44838519,"Users Score":5,"Answer":"slice:\"3\" and slice:\":x\" are both same as they will return first 3 elements from the list\nbut if you use slice:\"2:x\" then it will leave the 2 items from the first of the list and take from 3rd item till the number you mentioned in the x variable, its basically taking a part","Q_Score":5,"Tags":"python,django,django-templates,slice","A_Id":44838616,"CreationDate":"2017-06-30T04:17:00.000","Title":"The difference between django slice filter usages","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to deploy my Django application on pythonanywhere through manual-configuration. I selected Python 3.6.When I opened the console and type \"python --version\" It is showing python 2.7 instead of 3.6. How can I change this?\nPlease help me.","AnswerCount":4,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":3626,"Q_Id":44839204,"Users Score":0,"Answer":"Try to type \"python3 --version\". This can work on linux, but I am not sure whether it works on pythonanywhere","Q_Score":2,"Tags":"python,django,web-deployment,pythonanywhere","A_Id":44839307,"CreationDate":"2017-06-30T05:32:00.000","Title":"how can I change default python version in pythonanywhere?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to deploy my Django application on pythonanywhere through manual-configuration. I selected Python 3.6.When I opened the console and type \"python --version\" It is showing python 2.7 instead of 3.6. How can I change this?\nPlease help me.","AnswerCount":4,"Available Count":3,"Score":1.2,"is_accepted":true,"ViewCount":3626,"Q_Id":44839204,"Users Score":2,"Answer":"Python 3.6 is available as python3.6 in a console on PythonAnywhere.","Q_Score":2,"Tags":"python,django,web-deployment,pythonanywhere","A_Id":44850691,"CreationDate":"2017-06-30T05:32:00.000","Title":"how can I change default python version in pythonanywhere?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to deploy my Django application on pythonanywhere through manual-configuration. I selected Python 3.6.When I opened the console and type \"python --version\" It is showing python 2.7 instead of 3.6. How can I change this?\nPlease help me.","AnswerCount":4,"Available Count":3,"Score":0.0996679946,"is_accepted":false,"ViewCount":3626,"Q_Id":44839204,"Users Score":2,"Answer":"to set your default python version from 2.7 to 3.7 run the command below\n$ alias python=python3\nthat's it now check the version \n$ python --version \nit should be solved","Q_Score":2,"Tags":"python,django,web-deployment,pythonanywhere","A_Id":55050163,"CreationDate":"2017-06-30T05:32:00.000","Title":"how can I change default python version in pythonanywhere?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a flask application where i submit tasks to celery(worker) to execute it. so that i can get the webpage back after submitting. Can i achieve same if i submit the task to Jenkins instead? Just wanted an opinion why would i use celery when i can ask Jenkins to schedule\/execute the job through Jenkins API ? still get my webpage back. I may be wrong with my approach  but anyone who can shed light on this would really appreciate. \nThe Main aim is that user submits the form which actually is task to execute and after hitting submit task detachs from web , reloads the form. Meanwhile task runs in background which celery does it efficiently but can it be done via jenkins.\nThanks","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1256,"Q_Id":44843864,"Users Score":0,"Answer":"Couple of points below to consider to compare between celery and jenkins.\n\nCelery is specifically designed and built for running resource intensive tasks in background whereas jenkins is a more general tool for automation.\njenkins is built on java so native integration is there although plugins are available whereas celery is built with python so you can directly program the tasks in python and send it to celery or just call your shell tasks from python.\nMessage queuing - Again jenkins does not have builtin support for message brokers so queuing might be difficult for you. Celery uses rabbitmq as default to queue the tasks so your tasks never gets lost.\nCelery also provide simple callbacks so when task is completed you can run some function after it.\nNow if you ask about cpu comsumption then celery is not at all heavy","Q_Score":0,"Tags":"python,jenkins,flask,celery","A_Id":44846900,"CreationDate":"2017-06-30T10:05:00.000","Title":"Flask async job\/task submit to Celery or Jenkins","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Been trying for the last two hours and it keeps telling me that the job already exists:\nFrom the logs:\nBackup \"datastore_backup_2017_06_30\" already exists. (\/base\/data\/home\/runtimes\/python27\/python27_lib\/versions\/1\/google\/appengine\/ext\/datastore_admin\/backup_handler.py:853) Traceback (most recent call last): File \"\/base\/data\/home\/runtimes\/python27\/python27_lib\/versions\/1\/google\/appengine\/ext\/datastore_admin\/backup_handler.py\", line 839, in _ProcessPostRequest raise BackupValidationError('Backup \"%s\" already exists.' % backup) BackupValidationError: Backup \"datastore_backup_2017_06_30\" already exists.\nHowever, there is not a job running as far as I can tell. The last time I did one was this morning:\nStarted:    June 30, 2017, 9:27 a.m.\nCompleted:  June 30, 2017, 9:28 a.m.\nAnyone hd similar or have a solution","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":19,"Q_Id":44850538,"Users Score":2,"Answer":"The logs are telling you exactly what the problem is.  The backup you did today at 9:27AM already has the name \"datastore_backup_2017_06_30\".  To do another, it must have a unique name.  Try adding a time to the backup filename, or change it to \"datastore_backup_2017_06_30_2\".","Q_Score":0,"Tags":"python,google-app-engine,google-cloud-datastore","A_Id":44851226,"CreationDate":"2017-06-30T15:55:00.000","Title":"Can't do manual backup of ndb datastore from datastore admin","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have built a MITM with python and scapy.I want to make the \"victim\" device be redirected to a specific page each time it tried to access a website. Any suggestions on how to do it?\n*Keep in mind that all the traffic from the device already passes through my machine before being routed.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":141,"Q_Id":44851959,"Users Score":0,"Answer":"You can directly answer HTTP requests to pages different to that specific webpage with HTTP redirections (e.g. HTTP 302). Moreover, you should only route packets going to the desired webpage and block the rest (you can do so with a firewall such as iptables).","Q_Score":0,"Tags":"python,scapy","A_Id":44997621,"CreationDate":"2017-06-30T17:24:00.000","Title":"Python : Redirecting device with MITM","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to use selenium for a scraping job with a heap javascript generated webpages. I can open several instances of the webdriver at a time and pass the websites to the instances using queue.\nIt can be done in multiple way.s though. I've experimented with both the Threading module and the Pool- and Process-ways from the  multiprocessing module.\nAll work and will do the job quite fast.\nThis leaves me wondering: Which module is generalky prefered in a situation like this?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":632,"Q_Id":44860570,"Users Score":1,"Answer":"The main factor in CPython for choosing between Threads of Processes is based on your type of workload.\nIf you have a I\/O bound type of workload, where most of your application time is spent waiting for data to come in or to go out, then your best choice is using Threads.\nIf, instead, your application is spending great time using the CPU, then Processes are your tool of choice.\nThis is due to the fact that, in CPython (the most commonly used interpreter) only one Thread at a time can make use of the CPU cores. For more information regarding this limitation just read about the Global Interpreter Lock (GIL).\nThere is another advantage when using Processes which is usually overlooked: Processes allow to achieve a greater degree of isolation. This means that if you have some unstable code (in your case could be the scraping logic) which might hang or crash badly, encapsulating it in a separate Process allows your service to detect the anomaly and recover (kill the Process and restart it).","Q_Score":0,"Tags":"multithreading,python-3.x,selenium-webdriver,multiprocessing","A_Id":44864054,"CreationDate":"2017-07-01T11:49:00.000","Title":"Threading or multiprocessing for webscraping with selenium","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to create a python script (widget.py) that will get a JSON feed from an arbitrary resource. I can't get the python script to execute on localhost. Here are the steps I have followed:\n\nIn etc\/apache2\/httpd.conf I enabled LoadModule cgi_module libexec\/apache2\/mod_cgi.so\nRestarted Apache sudo apachectl restart\nAdded a .htaccess file to my directory:\n<Directory \"widget.py\">\n  Options +ExecCGI\n  AddHandler cgi-script .py\n<\/Directory>\nNOTE: I will eventually need to deploy this on a server where I won't have access to the apache2 directory.\nNavigated to http:\/\/localhost\/~walter\/widget\/widget.py\n\nI get a 500 server error. Log file contents:\n[Sat Jul 01 08:51:00.922413 2017] [core:info] [pid 75403] AH00096: removed PID file \/private\/var\/run\/httpd.pid (pid=75403)\n[Sat Jul 01 08:51:00.922446 2017] [mpm_prefork:notice] [pid 75403] AH00169: caught SIGTERM, shutting down\nAH00112: Warning: DocumentRoot [\/usr\/docs\/dummy-host.example.com] does not exist\nAH00112: Warning: DocumentRoot [\/usr\/docs\/dummy-host2.example.com] does not exist\n[Sat Jul 01 08:51:01.449227 2017] [mpm_prefork:notice] [pid 75688] AH00163: Apache\/2.4.25 (Unix) PHP\/5.6.30 configured -- resuming normal operations\n[Sat Jul 01 08:51:01.449309 2017] [core:notice] [pid 75688] AH00094: Command line: '\/usr\/sbin\/httpd -D FOREGROUND'\nDo I need to enable cgi in \/etc\/apache2\/users\/walter\/http.conf? Should I?","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":3573,"Q_Id":44862432,"Users Score":0,"Answer":"1, 2. Ok.\n\nAre .htaccess files allowed in \/etc\/apache2\/httpd.conf ?\n\n<Directory \"widget.py\"> \u2014 I think you want <File \"widget.py\">.\n\nLook into error log \u2014 what is the error?","Q_Score":1,"Tags":"python,apache,.htaccess,httpd.conf,macos-sierra","A_Id":44862745,"CreationDate":"2017-07-01T15:12:00.000","Title":"Executing python script on Apache in MacOS Sierra","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am trying to create a python script (widget.py) that will get a JSON feed from an arbitrary resource. I can't get the python script to execute on localhost. Here are the steps I have followed:\n\nIn etc\/apache2\/httpd.conf I enabled LoadModule cgi_module libexec\/apache2\/mod_cgi.so\nRestarted Apache sudo apachectl restart\nAdded a .htaccess file to my directory:\n<Directory \"widget.py\">\n  Options +ExecCGI\n  AddHandler cgi-script .py\n<\/Directory>\nNOTE: I will eventually need to deploy this on a server where I won't have access to the apache2 directory.\nNavigated to http:\/\/localhost\/~walter\/widget\/widget.py\n\nI get a 500 server error. Log file contents:\n[Sat Jul 01 08:51:00.922413 2017] [core:info] [pid 75403] AH00096: removed PID file \/private\/var\/run\/httpd.pid (pid=75403)\n[Sat Jul 01 08:51:00.922446 2017] [mpm_prefork:notice] [pid 75403] AH00169: caught SIGTERM, shutting down\nAH00112: Warning: DocumentRoot [\/usr\/docs\/dummy-host.example.com] does not exist\nAH00112: Warning: DocumentRoot [\/usr\/docs\/dummy-host2.example.com] does not exist\n[Sat Jul 01 08:51:01.449227 2017] [mpm_prefork:notice] [pid 75688] AH00163: Apache\/2.4.25 (Unix) PHP\/5.6.30 configured -- resuming normal operations\n[Sat Jul 01 08:51:01.449309 2017] [core:notice] [pid 75688] AH00094: Command line: '\/usr\/sbin\/httpd -D FOREGROUND'\nDo I need to enable cgi in \/etc\/apache2\/users\/walter\/http.conf? Should I?","AnswerCount":3,"Available Count":2,"Score":0.2605204458,"is_accepted":false,"ViewCount":3573,"Q_Id":44862432,"Users Score":4,"Answer":"Got it to work. Here are the steps that I followed:\n\nIn etc\/apache2\/httpd.conf I uncommented:\nLoadModule cgi_module libexec\/apache2\/mod_cgi.so\nRestarted Apache sudo apachectl restart\nList itemAdded a .htaccess file to my directory with the following contents:\nOptions ExecCGI\n AddHandler cgi-script .py\n Order allow,deny\n Allow from all\nAdded #!\/usr\/bin\/env python to the top of my python script\nIn terminal enabled execution of the python script using: chmod +x widget.py","Q_Score":1,"Tags":"python,apache,.htaccess,httpd.conf,macos-sierra","A_Id":44865681,"CreationDate":"2017-07-01T15:12:00.000","Title":"Executing python script on Apache in MacOS Sierra","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I can import BeautifulSoup using Python 2.7 but not when I try using Python 3.6, even though BeautifulSoup claims to work on both?\nSorry this is my first question so apologies if it's trivial or if I haven't used the proper conventions.\n\n\n\nfrom BeautifulSoup import *\n      Traceback (most recent call last):\n        File \"\", line 1, in \n        File \"\/Users\/tobiecusson\/Desktop\/Python\/Ch3-PythonForWebData\/AssignmentWeek4\/BeautifulSoup.py\", line 448\n          raise AttributeError, \"'%s' object has no attribute '%s'\" % (self.class.name, attr)\n                              ^\n      SyntaxError: invalid syntax\nfrom BS4 import BeautifulSoup\n      Traceback (most recent call last):\n        File \"\", line 1, in \n        File \"\/Users\/tobiecusson\/Desktop\/Python\/Ch3-PythonForWebData\/AssignmentWeek4\/BS4.py\", line 448\n          raise AttributeError, \"'%s' object has no attribute '%s'\" % (self.class.name, attr)\n                              ^\n      SyntaxError: invalid syntax","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":289,"Q_Id":44870168,"Users Score":0,"Answer":"Just noticed - you're importing from BeautifulSoup.\nTry from bs4 import *","Q_Score":0,"Tags":"beautifulsoup,python-3.6","A_Id":44872494,"CreationDate":"2017-07-02T11:11:00.000","Title":"Python 3.6 Beautiful Soup - Attribute Error","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"i have a problem, if you have any idea how it may be fixed, please help)\nI have a project, which run by the .sh file, and this .sh refers to a python file.py which uses the Flask for html-reports.\nWhen i run the file.py (for simplify with 'hello world'), but when i run the .sh file, it writes the error \"ImportError: No module named 'flask'\".\nI installed the virtualenv for file.py's folder and .sh folder.\nPlease, give an advice for fix it. Thank's.","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":986,"Q_Id":44881128,"Users Score":0,"Answer":"Installing wheel using:\npip install wheel\nworks, not sure what influenced it.","Q_Score":0,"Tags":"python,shell,flask","A_Id":44884067,"CreationDate":"2017-07-03T08:40:00.000","Title":"Run Flask from run.sh","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Trying to install a postgresql database which resides on Azure for my python flask application; but the installation of psycopg2 package requires the pg_config file which comes when postgresql is installed. So how do I export the pg_config file from the postgresql database which also resides on azure? Is pg_config all psycopg2 need for a successful installation?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":164,"Q_Id":44911066,"Users Score":2,"Answer":"You don't need the specific pg_config from the target database. It's only being used to compile against libpq, the client library for PostgreSQL, so you only need the matching PostgreSQL client installed on your local machine.\nIf you're on Windows I strongly advise you to install a pre-compiled PostgreSQL. You can just install the whole server, it comes with the client libraries.\nIf you're on Linux, you'll probably need the PostgreSQL -devel or -dev package that matches your PostgreSQL version.","Q_Score":0,"Tags":"python,postgresql,azure,psycopg2","A_Id":44915875,"CreationDate":"2017-07-04T16:59:00.000","Title":"How to retrieve the pg_config file from Azure postgresql Database","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm currently working on a larger Apache Beam pipeline with the Python API which reads data from BigQuery and in the end writes it back to another BigQuery task. \nOne of the transforms needs to use a binary program to transform the data, and for that it needs to load a 23GB file with binary lookup data. So starting and running the program takes a lot of overhead (takes about 2 minutes to load\/run each time) and RAM, and it wouldn't make sense to start it up for just a single record. Plus the 23GB file would need to be copied locally from Cloud Storage every time.\nThe workflow for the binary would be:\n\nCopy 23GB file from cloud storage if it's not there already\nSave records to a file\nrun the binary with call()\nread the output of the binary and return it\n\nThe amount of records the program can process at a time is basically unlimited, so it would be nice to get a somewhat-distributed Beam Transform, where I could specify a number of records to be processed at once (say 100'000 at a time), but still have it distributed so it can run it for 100'000 records at a time on multiple nodes.\nI don't see Beam supporting this behaviour, it might be possible to hack something together as a KeyedCombineFn operation that collects records based on some split criterion\/key and then runs the binary in the merge_accumulators step over the accumulated records. But this seems very hackish to me.\nOr is it possible to GroupByKey and process groups as batches? Does this guarantee that each group is processed at once, or can groups be split behind the scenes by Beam?\nI also saw there's a GroupIntoBatches in the Java API, which sounds like what I'd need, but isn't available in the Python SDK as far as I can tell.\nMy two question are, what's the best way (performance-wise) to achieve this use-case in Apache Beam, and if there isn't a good solution, is there some other Google Cloud service that might be better suited that could be used like Beam --> Other Service --> Beam ?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1299,"Q_Id":44942445,"Users Score":1,"Answer":"Groups cannot be split behind the scenes, so using a GroupByKey should work. In fact, this is a requirement since each individual element must be processed on a single machine and after a GroupByKey all values with a given key are part of the same element.\nYou will likely want to assign random keys. Keep in mind that if there are too many values with a given key it may also be difficult to pass all of those values to your program -- so you may also want to limit how many of the values you pass to the program at a time and\/or adjust how you assign keys.\nOne trick for assigning random keys is to generate the random number in start bundle (say 1 to 1000) and then in process element just increment this and wrap 1001 to 1000. This avoids generating a random number for every element, and still ensures a good distribution of keys.\nYou could create a PTransform for both this logic (divide a PCollection<T> into PCollection<List<T>> chunks for processing), and that would be potentially reusable in similar situations.","Q_Score":0,"Tags":"python,google-cloud-platform,google-cloud-dataflow,apache-beam","A_Id":44953748,"CreationDate":"2017-07-06T07:31:00.000","Title":"Batch Processing in Apache Beam with large overhead","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have an app other in django. I have models like PaymentMethods , Currencies , ReasonCodes , DeviceInfo etc in this app.. I want to display few models under a different heading. How can I do this? Do we have to use a library? Tried using django-modeladmin-reorder library. But it doesnt work. Note : I am using Django 1.8 and a library django-material for the admin interface.\nEg of what I would want. Other is my app name. It has 4 models under it. \nPaymentMethods,\nCurrencies,\nReasonCodes ,\nDeviceInfo\nNow in the default admin, all the 4 models are displayed under other app.\nI need to display like this,\nverbose name of other will be 'payments' and under this i would want \nPaymentMethods,\nCurrencies\nand another section named 'device info' and under this, \nReasonCodes ,\nDeviceInfo\nshould be shown.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":525,"Q_Id":44945622,"Users Score":0,"Answer":"You can override admin\/base_site.html and write your own version of {% block sidenav_header %}","Q_Score":1,"Tags":"python,django,django-admin,django-apps","A_Id":45302632,"CreationDate":"2017-07-06T09:55:00.000","Title":"Display models of same app in different app django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to display only users which is in a group.\nFor example, I have two fields group and assigned to.\n   If i select a group, then i should get only list of that group.\nCan you provide any solution for this problem please","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":29,"Q_Id":44948644,"Users Score":0,"Answer":"Use the filter function. Press \"Add custom filter\" and select \"Groups\" in the first line, \"is equal to\" in the second and your group name in the third.\nThen press apply.","Q_Score":0,"Tags":"xml,python-2.7,odoo-8","A_Id":44948828,"CreationDate":"2017-07-06T12:16:00.000","Title":"Display users related to specified group","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am relatively new to Django.\nI have managed to create a basic app and all that without problems and it works fine.\nThe question probably has been asked before.\nIs there a way to update existing Django models already mapped to existing databases when the underlying database is modified?\nTo be specific, I have mysql database that I use for my Django app as well as some standalone python and R scripts. Now, it is much easier to update the mysql database with, say, daily stock prices, everyday from my existing scripts outside Django models. Ideally, what I would like is to have my Django models that are already mapped to these tables to reflect the updated data.\nI know there is $ python manage.py inspectdb for creating models from existing databases. But that is not the objective.\nFrom what I have gathered so far from the docs and online searches, it is imperative to update the backend database through Django models. Not outside of it. Is it the case really? As long as the table structure doesn;t change I really don't see the why this should not be allowed. Database is meant to serve multiple customers isn't it? With Django being one of it.\nAnd I can not provide a reproducible example as it is a conceptual question.\nIf this functionality doesn't exist, imho, it really should.\nThanks,\nKaustubh","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":514,"Q_Id":44954521,"Users Score":4,"Answer":"You don't need to update models if you just added new data. Models are related to a database structure only.","Q_Score":1,"Tags":"python,django,django-models","A_Id":44954903,"CreationDate":"2017-07-06T16:33:00.000","Title":"Django models update when backend database updated","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a web app built by Django, front-end is built by React. I tried to test bdd with behave and selenium. I run a test with Chrome web driver and phantomjs one but the tests only passed using chrome. I captured a screenshot when it runs on phantom and saw that the page is not fully rendered. Please give some suggestions about this issue. Do I need do further configuration to test with phantomjs. Thank you.","AnswerCount":3,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":105,"Q_Id":44967663,"Users Score":0,"Answer":"You have 3 options:\n\nimplicitly_wait:\n\nImplicitly wait means that the it will wait for a maximum of x seconds to search for an element so if you element will appear after 4 seconds you will get it when it will appear second if you set the implicitly wait greater than 4seconds.\nUse driver.implicitly_wait(x) after creating the instance.\n\nexplicitly_wait:\n\nExplicitly wait means the it will wait for x seconds and it will search for the element after the seconds passed so if you set 10 seconds and the element will appear after 4 seconds the element will be located with 6 seconds delay.\nUse driver.explicitly_wait(x) after creating the instance\n\ntime.sleep\n\nYou can put your program to sleep and wait for the page to fully load after submitting some actions.\nUse time.sleep(x) after submitting a form, clicking a button or loading a page.","Q_Score":0,"Tags":"python,selenium,phantomjs,bdd","A_Id":44968416,"CreationDate":"2017-07-07T09:45:00.000","Title":"BDD - Test pass on chrome but not on Phantomjs","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a web app built by Django, front-end is built by React. I tried to test bdd with behave and selenium. I run a test with Chrome web driver and phantomjs one but the tests only passed using chrome. I captured a screenshot when it runs on phantom and saw that the page is not fully rendered. Please give some suggestions about this issue. Do I need do further configuration to test with phantomjs. Thank you.","AnswerCount":3,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":105,"Q_Id":44967663,"Users Score":0,"Answer":"Try adding an explicit wait on a locator (waitForElementToBePresent) that exists on the part of page that is not rendered on Phantomjs.","Q_Score":0,"Tags":"python,selenium,phantomjs,bdd","A_Id":44968229,"CreationDate":"2017-07-07T09:45:00.000","Title":"BDD - Test pass on chrome but not on Phantomjs","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a web app built by Django, front-end is built by React. I tried to test bdd with behave and selenium. I run a test with Chrome web driver and phantomjs one but the tests only passed using chrome. I captured a screenshot when it runs on phantom and saw that the page is not fully rendered. Please give some suggestions about this issue. Do I need do further configuration to test with phantomjs. Thank you.","AnswerCount":3,"Available Count":3,"Score":0.0665680765,"is_accepted":false,"ViewCount":105,"Q_Id":44967663,"Users Score":1,"Answer":"This is a common problem with PhantomJS (the page not being fully rendered), and often isn't something that can be remedied with explicit\/implicit waits. Add a long (5 second) sleep to your code and take another screenshot. \nIf the page is fully rendered, follow @Alex Lucaci's instructions for adding (ideally) explicit waits.\nIf the page still isn't fully rendered, PhantomJS just wont work for you in this case. Personally, I would advise against using PhantomJS at all, as it is problematic in a myriad of ways, but also because why would you test on a browser that literally no one uses as their actual browser?","Q_Score":0,"Tags":"python,selenium,phantomjs,bdd","A_Id":44972125,"CreationDate":"2017-07-07T09:45:00.000","Title":"BDD - Test pass on chrome but not on Phantomjs","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"how to add trigger s3 bucket to lambda function with boto3, then I want attach that lambda function to dynamically created s3 buckets using programmatically(boto3)","AnswerCount":3,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":3218,"Q_Id":44982302,"Users Score":1,"Answer":"Three steps I followed\n1) connected to aws lambda with boto3 used add_permission API\n2)also applyed get_policy\n3)connected to S3 with boto resource to  configuring BucketNotification API,put LambdaFunctionConfigurations","Q_Score":2,"Tags":"python-2.7,amazon-web-services,amazon-s3,aws-lambda,aws-sdk","A_Id":45005925,"CreationDate":"2017-07-08T03:50:00.000","Title":"how to add the trigger s3 bucket to lambda function dynamically(python boto3 API)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How can i show the time of last seen(be online)of user in django?\nIs there any default function or library to import it to do that?\nOr if there any code inn github tell me please\n**Note : ** when a user close page or disconnect the time update","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":2078,"Q_Id":44983942,"Users Score":1,"Answer":"You should inherit django's AbstractBaseUser in your user model, it already has an inbuilt last_login attribute. In fact it is considered a good practice to inherit AbstractBaseUser for creating your user which is provided in django default auth modules.","Q_Score":2,"Tags":"python,django,python-2.7,django-views","A_Id":44984970,"CreationDate":"2017-07-08T07:59:00.000","Title":"Last seen a user in django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm learning Django and to practice I'm currently developing a clone page of YTS, it's a movie torrents repository*. \nAs of right now, I scrapped all the movies in the website and have them on a single db table called Movie with all the basic information of each movie (I'm planning on adding one more for Genre).\nEvery few days YTS will post new movies and I want my clone-web to automatically add them to the database. I'm currently stuck on deciding how to do this:\n\nI was planning on comparing the movie id of the last movie in my db against the last movie in the YTS db each time the user enters the website, but that'd mean make a request to YTS every time my page loads, it'd also mean some very slow code should be executed inside my index() views method.\nAnother strategy would be to query the last time my db was updated (new entries were introduced) and if it's let's say bigger than a day then request new movies to YTS. Problem with this is I don't seem to find any method to query the time of last db updates. Does it even exist such method?\nI could also set a cron job to update the information but I'm having problems to make changes from a separated Python function (I import django.db and such but the interpreter refuses to execute django db instructions).\n\nSo, all in all, what's the best strategy to update my database from a third party service\/website without bothering the user with loading times? How do you set such updates in non-intrusive way to the user? How do you generally do it?\n* I know a torrents website borders the illegal and I'm not intended, in any way, to make my project available to the public","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":114,"Q_Id":44988422,"Users Score":2,"Answer":"I think you should choose definetely the third alternative, a cron job to update the database regularly seems the best option.\n You don' t need to use a seperate python function, you can schedule a task with celery, which can be easily integrated with django using django-celery","Q_Score":0,"Tags":"python,django,database,cron","A_Id":44988567,"CreationDate":"2017-07-08T16:35:00.000","Title":"Updating my Django website's database from a third party service, strategies?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"What is the procedure to restore a Django project using an already restored database from a PostgreSQL pg_dump. All django source code also exist. Will Django migration safe?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":1502,"Q_Id":44990820,"Users Score":1,"Answer":"If your dump has create table statements and contains all django tables, you can restore it directly onto an empty database. Django will know the status of the migrations as they are stored in a table in the DB.\nSo the steps would be:\n\nDrop and recreate DB.\nIf you now run python manage.py showmigrations all migrations will  appear unapplied\nRestore DB from dump\nIf you now run python manage.py showmigrations now, the corresponding migrations will appear applied. If your django project has new migrations that weren't applied when the dump was created they will appear unapplied.\n\nAnd that's it! Now you can apply the new migrations if there are any and keep working on the Django project.","Q_Score":3,"Tags":"python,django,postgresql,django-migrations,django-database","A_Id":47176858,"CreationDate":"2017-07-08T21:15:00.000","Title":"How to restore Django project with pg_dump file?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a large application and I am using Headless Chrome, Selenium and Python to test each module. I want to go through each module and get all the JS console errors produced while inside that specific module.\nHowever, since each module is inside a different test case and each case executes in a separate session, the script first has to login on every test. The login process itself produces a number of errors that show up in the console. When testing each module I don't want the unrelated login errors to appear in the log.\nBasically, clear anything that is in the logs right now -> go to the module and do something -> get logs that have been added to the console.\nIs this not possible? I tried doing driver.execute_script(\"console.clear()\") but the messages in the console were not removed and the login-related messages were still showing after doing something and printing the logs.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":3566,"Q_Id":44991009,"Users Score":1,"Answer":"This thread is a few years old, but in case anyone else finds themselves here trying to solve a similar problem:\nI also tried using driver.execute_script('console.clear()') to clear the console log between my login process and the page I wanted to check to no avail.\nIt turns out that calling driver.get_log('browser') returns the browser log and also clears it.\nAfter navigating through pages for which you want to ignore the console logs, you can clear them with something like\n_ = driver.get_log('browser')","Q_Score":2,"Tags":"javascript,python,google-chrome,selenium","A_Id":70308976,"CreationDate":"2017-07-08T21:44:00.000","Title":"Clear Chrome browser logs in Selenium\/Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to clone a single webpage with all the images and no links in the html. I can achieve this with  wget -E -H -k -K -p {url} however this pulls down the webpage with a full structure and you have to navigate to the html file to display the contents. This makes it inconsistent in where the html file to display the webpage would be. \nI can also do this wget --no-check-certificate -O index.html -c -k {url} however this keeps the links to images and doesn't make the webpage truly local as it has to go out to the web to display the page properly.\nIs there any way to clone a single webpage and spit out an index.html with the images linked locally?\nPS: I am using wget through a python script that makes changes to webpages so having an index.html is neccesary for me.  I am interested in other methods if there are better ones.\nEDIT:\nSo it seems I haven't explain myself well but a bit background info on this project is I am working on a proof of concept for school on an automated phishing script which is supposed to clone a webpage, modify a few action tags and be placed on a local web server so that a user can navigate to it and the page will display correctly. Previously using the -O worked fine for my but since I am now incorporating DNS spoofing into my project the webpage cant have any links pointing externally as they will just end up getting rerouted to my internal webserver and the webpage will look broken. That is why I need to have just the information necessary for the single webpage to be displayed correctly but also have it predictable so that I am able to be sure that when i navigate to the directory I cloned the website from the webpage will be displayed (with proper links to images,css etc..)","AnswerCount":2,"Available Count":2,"Score":0.1973753202,"is_accepted":false,"ViewCount":2154,"Q_Id":44992763,"Users Score":2,"Answer":"use this wget facebook.com --domains website.org --no-parent --page-requisites --html-extension --convert-links if you wanna download all the entire website add --recursive after the web pages","Q_Score":1,"Tags":"python,html,wget","A_Id":44992870,"CreationDate":"2017-07-09T03:43:00.000","Title":"Clone a single webpage (with images) and save to index.html","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to clone a single webpage with all the images and no links in the html. I can achieve this with  wget -E -H -k -K -p {url} however this pulls down the webpage with a full structure and you have to navigate to the html file to display the contents. This makes it inconsistent in where the html file to display the webpage would be. \nI can also do this wget --no-check-certificate -O index.html -c -k {url} however this keeps the links to images and doesn't make the webpage truly local as it has to go out to the web to display the page properly.\nIs there any way to clone a single webpage and spit out an index.html with the images linked locally?\nPS: I am using wget through a python script that makes changes to webpages so having an index.html is neccesary for me.  I am interested in other methods if there are better ones.\nEDIT:\nSo it seems I haven't explain myself well but a bit background info on this project is I am working on a proof of concept for school on an automated phishing script which is supposed to clone a webpage, modify a few action tags and be placed on a local web server so that a user can navigate to it and the page will display correctly. Previously using the -O worked fine for my but since I am now incorporating DNS spoofing into my project the webpage cant have any links pointing externally as they will just end up getting rerouted to my internal webserver and the webpage will look broken. That is why I need to have just the information necessary for the single webpage to be displayed correctly but also have it predictable so that I am able to be sure that when i navigate to the directory I cloned the website from the webpage will be displayed (with proper links to images,css etc..)","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":2154,"Q_Id":44992763,"Users Score":0,"Answer":"wget is a bash command. There's no point in invoking it through Python when you can directly achieve this task in Python. Basically what you're trying to make is a web scraper. Use requests and BeautifulSoup modules to achieve this. Research a bit about them and start writing a script. If you hit any errors, feel free to post a new question about it on SO.","Q_Score":1,"Tags":"python,html,wget","A_Id":44992881,"CreationDate":"2017-07-09T03:43:00.000","Title":"Clone a single webpage (with images) and save to index.html","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a website and i want to destroy some session or cookie in django when user discoonet suddenly or get offline (wifi discoonect or disconnect mobil data).\nBut i dont know to how do this!\nIs there any default library to do this?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":748,"Q_Id":44994358,"Users Score":0,"Answer":"Well you can't know if users disconnected their internet or WiFi.\nBut you can check if user is still online and browsing the website.\nto achieve that you can use javascript to send a request every 10 second (less or more) and check if user is still on the site. and if user is not online anymore you can make some changes or etc but in general you can't access to the users device and check the status for wifi or ...","Q_Score":1,"Tags":"python,django,session,cookies,session-cookies","A_Id":44994487,"CreationDate":"2017-07-09T08:11:00.000","Title":"Destroy session or cookie in django when user get offline","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am attempting to put the custom method, that would send results of automated tests to JIRA, in the Behave's environment.py. It would be in after_scenario() or after_feature(). So I want it to send the results to JIRA after closing tests. \nIt seems that those methods in environment.py only take in the methods that are part of context class. Is that right? Is there any walkaround this issue?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":452,"Q_Id":45010745,"Users Score":1,"Answer":"Your functions in \"environment.py\" can have any parameter that you like them to have. Only the hooks have a specified signature (as any API function). Therefore, if the feature object is sufficient to your processing, you should avoid to require somebody to pass the context object, too.","Q_Score":0,"Tags":"python,selenium,automated-tests,cucumber,python-behave","A_Id":46268432,"CreationDate":"2017-07-10T11:22:00.000","Title":"Put custom methods in Behave's environment.py","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am to develop an app, and I have to choose between Ruby on Rails or Python+Django. So far I want to do it with Ruby on Rails, because i feel more comfortable doing what I have to do on it. \nBut there is a problem. There would be a client app written on Python that has to communicate with mine. Cause that app should be able to communicate with mine.\nFirst: I think if it is a matter of communicating with the MySQL database there wouldn't be an issue, cause the Python app is able to query to MySQL server with proper authentication right?\nSecond: and more important question: If I have a Ruby written API, to ease the queries, Could the Python app be able to invoke functions in that API and get the results? If it is possible, How could I achieve that?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":344,"Q_Id":45012914,"Users Score":1,"Answer":"Ruby on Rails 5 supports API only app, if you are using this app for APIs only, else just create a normal app and expose API endpoints that render json outputs. Use Active Record for mapping your MySql database and jbuilder for json views (both of which are available by default when you create new app). You will find lots of tutorials if you google Use Ruby on Rails as API app.\nGood luck with it.. :)","Q_Score":0,"Tags":"python,ruby-on-rails,ruby","A_Id":45013053,"CreationDate":"2017-07-10T13:07:00.000","Title":"How to communicate from a Python client to Ruby on Rails application?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am a beginner trying to find a way to stream audio on a local server. I have a Python script that creates some binary data from a robot's microphone, and I want to send this data to be displayed on a local Go server I created.\nI read somewhere that web sockets could be a solution.\nBut what's the simplest way to upload the audio buffers from the Python script? And how would I retrieve this raw binary data so that it can be streamed from the web app?\nMany many thanks.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":268,"Q_Id":45014245,"Users Score":0,"Answer":"There is no single \"Best\" way.  If the protocol has to go over ports 80\/443 on the open internet, you could use web-sockets.  You could also POST base64 encoded chunks of data from python back to your server.  \nIf the robot and server are on the same network, you could send UDP packets from the robot to your server.  (Usually a missing packet or two on audio is not a problem).  Even if you have a web based Go server, you can still fire off a go routine to listen on UDP for incoming packets.  \nIf you could be more specific, maybe I or someone else could give a better answer?","Q_Score":0,"Tags":"python,go,stream,buffer,transfer","A_Id":45017089,"CreationDate":"2017-07-10T14:08:00.000","Title":"Transfer audio buffers from a Python script to a Go server?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm thinking of starting to use Apache Airflow for a project and am wondering how people manage continuous integration and dependencies with airflow. More specifically\nSay I have the following set up\n3 Airflow servers: dev staging and production.\nI have two python DAG'S whose source code I want to keep in seperate repos.\nThe DAG's themselves are simple, basically just use a Python operator to call main(*args, **kwargs). However the actually code that's run by main is very large and stretches several files\/modules.\nEach python code base has different dependencies\nfor example,\nDag1 uses Python2.7 pandas==0.18.1, requests=2.13.0\nDag2 uses Python3.6 pandas==0.20.0 and Numba==0.27 as well as some cythonized code that needs to be compiled\nHow do I manage Airflow running these two Dag's with completely different dependencies?\nAlso, how do I manage the continuous integration of the code for both these Dags into each different Airflow enivornment (dev, staging, Prod)(do I just get jenkins or something to ssh to the airflow server and do something like git pull origin BRANCH)\nHopefully this question isn't too vague and people see the problems i'm having.","AnswerCount":1,"Available Count":1,"Score":0.537049567,"is_accepted":false,"ViewCount":1922,"Q_Id":45015116,"Users Score":3,"Answer":"We use docker to run the code with different dependencies and DockerOperator in airflow DAG, which can run docker containers, also on remote machines (with docker daemon already running). We actually have only one airflow server to run jobs but more machines with docker daemon running, which the airflow executors call.\nFor continuous integration we use gitlab CI with the Gitlab container registry for each repository. This should be easily doable with Jenkins.","Q_Score":6,"Tags":"python,airflow","A_Id":45117737,"CreationDate":"2017-07-10T14:46:00.000","Title":"Apache Airflow Continous Integration Workflow and Dependency management","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I built a program to go on a website and click a link which automatically downloads a file. It works when I run it on my mac (Chrome), but when I use the exact same code on AWS, nothing gets downloaded. \nIf it helps at all, I tried to expedite the process and found the raw link, I could download that via wget but not through python (on any computer).","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":39,"Q_Id":45022643,"Users Score":0,"Answer":"There are many things that could happen. You sould check your logs and add them to the question. One thing I am sure in is that you don't use any virtual display, and you don't have a display on AWS. So you should google for \"python running selenium headless\"","Q_Score":1,"Tags":"python,google-chrome,amazon-web-services,selenium,selenium-chromedriver","A_Id":45022691,"CreationDate":"2017-07-10T22:32:00.000","Title":"Link doesn't work on AWS with Selenium","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How can I handle the security of web frameworks like django on github or any other public domain version control site.  \nThe settings.py can and will often contain sensitive database information, passwords and secret keys, which must not be uploaded on the repository and in plain view.\nWhat is the common practice and least hassle way of handling that?","AnswerCount":4,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1794,"Q_Id":45024466,"Users Score":0,"Answer":"I generally use different settings.py for each stage (development, testing and prodcution).  The only one that I keep on a version control is the one corresponding to development.  The other settings.py are internal and, when required, they are copied to each instance of the server (testing and production).\nHope this helps.","Q_Score":10,"Tags":"python,django,git,github","A_Id":45024535,"CreationDate":"2017-07-11T02:38:00.000","Title":"Django Projects and git","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How can I handle the security of web frameworks like django on github or any other public domain version control site.  \nThe settings.py can and will often contain sensitive database information, passwords and secret keys, which must not be uploaded on the repository and in plain view.\nWhat is the common practice and least hassle way of handling that?","AnswerCount":4,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1794,"Q_Id":45024466,"Users Score":0,"Answer":"Easy answer: Add it to your .gitignore. That said, if you're intending to share your Django app, you'll want to provide at least the parts you edited for your app .","Q_Score":10,"Tags":"python,django,git,github","A_Id":45024539,"CreationDate":"2017-07-11T02:38:00.000","Title":"Django Projects and git","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I don't want it to show up after performing an action, I want it to show up on all pages of the Django admin panel.\nIs this possible?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":553,"Q_Id":45039917,"Users Score":1,"Answer":"Is it a static message? I'd just override the necessary admin templates and not use django.contrib.messages as you may be tempted to - it may be confusing to the user.","Q_Score":0,"Tags":"python,django","A_Id":45046493,"CreationDate":"2017-07-11T16:23:00.000","Title":"How can I display a global alert in Django admin panel?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am in the process of updating a project so that, in one of the apps, the user can copy a vertical list of values from a text\/excel file\/[file format] into a form. I want the form to hold as many values as the user will paste (so hopefully it will be dynamic in length).\nWhen the user submits the form, my views.py will process the data. What field type should I use to do this? (If it is even possible to do this)","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":329,"Q_Id":45042402,"Users Score":0,"Answer":"Figured it out! I just used a Textarea instead of a TextField.","Q_Score":0,"Tags":"python,django,forms","A_Id":45043143,"CreationDate":"2017-07-11T18:47:00.000","Title":"Django Form Field for Copying and Pasting Vertical List","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm running ODOO 10 from source code in Eclipse on Windows 10. It's running ok in the web interface (on localhost)\nI want to control the odoo via command line at the same time. Can I do so while its running in the web interface?\nIf so how do I invoke the odoo commands to the server?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1605,"Q_Id":45043181,"Users Score":0,"Answer":"You can try below\npython .\/odoo-bin -c odoo.conf\nHope this help you","Q_Score":1,"Tags":"python,windows,eclipse,odoo-10","A_Id":56924563,"CreationDate":"2017-07-11T19:37:00.000","Title":"How to control odoo 10 from command line while its running in the web","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"When you make a file field with WTForms in Flask, it only returns the filename. Does anyone know how to get it to return the full path of the file?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":786,"Q_Id":45043654,"Users Score":0,"Answer":"The file was uploaded from the user, the browser gets it and keeps it on the sky, so you can save it with a path. That's why you can't get its full path. \nIf an apple flies in the sky, how do you know which apple tree he comes from?","Q_Score":0,"Tags":"python,flask,wtforms,flask-wtforms","A_Id":45047577,"CreationDate":"2017-07-11T20:09:00.000","Title":"Python Flask Wtforms File Field full path","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an application backend in Django-rest-framework, and I have a reactjs app.\nHow can I do to they work together ? \nFor development I open 2 terminals and run them separately. There is some way to make them work together ? \nAlso to deploy it to production I have no idea how I can do that.\nI tried to look for some github project ready, but couldn't find anything\nThanks!","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":999,"Q_Id":45045165,"Users Score":0,"Answer":"For dev:\nYou can run both of them on two different shells. By default, your django rest api will be at 127.0.0.1:8000 and React will at 127.0.0.1:8081. I do not think there will be any issues for the two to communicate via the fetch api. Just make sure you have ALLOWED_HOSTS=['127.0.0.1'] in your django's settings file.\nFor production:\nIt will work like any other mobile app or web app does! Host your your RESTful API on an application server (aws, heroku or whatever you choose) and create and host your React App separately. Use Javascript's fetch api to send requests to your django endpoints and use the json\/xml response to render your views in React.","Q_Score":3,"Tags":"python,django,reactjs,django-rest-framework","A_Id":45045751,"CreationDate":"2017-07-11T22:01:00.000","Title":"How to configure Django Rest Framework + React","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using Django_filters to create filters. I have to use ModelChoiceFilter due to foreign key in models. The filter automatically returns a drop down list, is there a way to display a text input box instead of drop down list when I use ModelChoiceFilter? Thanks\ncode:\nGPA = django_filters.ModelChoiceFilter(name='persontoschool__GPA',                                      queryset=PersonToSchool.objects.values_list('GPA',flat=True).distinct(),to_field_name='GPA', lookup_expr='gte')","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":306,"Q_Id":45065232,"Users Score":0,"Answer":"Filters actually construct an underlying Django form Field in order to perform input validation, rendering, etc... Arguments that the filter does not expect are passed to the form field's constructor. If you want to use a plain text input, then you can simply pass the appropriate widget to the Filter.","Q_Score":0,"Tags":"python,django,django-filter","A_Id":45172083,"CreationDate":"2017-07-12T18:34:00.000","Title":"Django_filters ModelChoiceFilter display text input","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have my project stored on OneDrive. It sometimes works on my pc and laptop both of which have Windows 10. The project on both is in the same directory- C:\/OneDrive\/code\/etc...\nWhen I use virtualenv and download different packages, it works fine, but when I use my laptop nothing works at all (same applies the other way around). I get the following error:\n\nCould not import runpy module ImportError:\nNo module named 'runpy'\n\nWhat can I do to fix this problem on my laptop and PC? Anyone experiencing a similar issue?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2283,"Q_Id":45082883,"Users Score":3,"Answer":"Don't do this. OneDrive - and similar systems like Dropbox - are meant for sharing documents. They are not meant for code, and even less for installed libraries.\nStore your code in a version control system like git, and push it up regularly to a host like Github. Then on each of your computers, clone the repo and install the dependencies locally inside a virtualenv.","Q_Score":0,"Tags":"python,django,virtualenv","A_Id":45082989,"CreationDate":"2017-07-13T13:58:00.000","Title":"Python virtualenv can`t work through OneDrive","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"i started a new project in Django but local environment settings come from the previous project.\nSo how can i reset local environment settings?\nThank you..","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1354,"Q_Id":45088254,"Users Score":0,"Answer":"Started a new project. And you replaced the settings.py from another project? If so just update your database and install the required packages with pip. To update the database: python manage.py makemigrations and then python manage.py migrate.","Q_Score":1,"Tags":"python,django,localhost","A_Id":45088312,"CreationDate":"2017-07-13T18:17:00.000","Title":"Django Local Environment Settings","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a chrome extension ingesting data from various web pages I visit and storing it to a database (Python\/Flask)\nI also have a dashboard visualizing that database (using react-create-app node\/react\/redux).\nI want the dashboard to be automatically updated every time I add\/delete\/modify a record in the database. \nFrom what I understand that is specifically what a webhook is for. \nWhat I want to do is create a \"listener\" on the database so that every time a change is made, it will fire off a request to the node server.\nA few things: 1.) How do I create \"something\" to listen for changes in a database? 2.) Normally my webpage initiates a web request and listens for data in the call back. How do I structure it so it just \"listens\" for new updates?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2099,"Q_Id":45091955,"Users Score":1,"Answer":"When you request a page from the node server on every request you receive in the flask app that handles CRUD changes you effectively created a web hook (one server requesting or posting another). You may want to offload this to a background thread or job system, like beanstalkd. Giving you asynchronous webhook calls. If you want the page you monitor to also update you might be interested in web sockets.","Q_Score":1,"Tags":"python,flask","A_Id":45095487,"CreationDate":"2017-07-13T22:36:00.000","Title":"Creating a webhook in Flask","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"When I read the code to make an Alexa skill in python, I am confused by session. Can you tell me what session means in the function? (session_attribute, or session.get('attributes', {}))\nThank you","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":103,"Q_Id":45092884,"Users Score":1,"Answer":"You can use the session object to save data, for example, save the state of the conversation.","Q_Score":0,"Tags":"python,amazon-web-services,aws-lambda,alexa,alexa-skills-kit","A_Id":45093014,"CreationDate":"2017-07-14T00:37:00.000","Title":"What does session mean in the function for Alexa skills?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to export data from Aurora into S3, I have created a stored procedure to perform this action. I can schedule this on the Aurora Scheduler to run at a particular point in time.\nHowever, I have multiple tables - could go up to 100; so I want my process controller which is a python script sitting in Lambda to send a Queue Message - Based on this Queue message the stored procedure in Aurora will be started\nI am looking at this for the following reasons\n\nI do not want too much time lag between starting two exports\nI also do not want two exports overlapping in execution time","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":679,"Q_Id":45098004,"Users Score":0,"Answer":"There isn't any built-in integration that allows SQS to interact with Aurora.\nObviously you can do this externally, with a queue consumer that reads from the queue and invokes the procedures, but that doesn't appear to be relevant, here.","Q_Score":0,"Tags":"python,amazon-web-services,amazon-sqs,amazon-aurora","A_Id":45124304,"CreationDate":"2017-07-14T08:14:00.000","Title":"Does anyone know if we can start a storedprocedure in Aurora based on SQS","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to export data from Aurora into S3, I have created a stored procedure to perform this action. I can schedule this on the Aurora Scheduler to run at a particular point in time.\nHowever, I have multiple tables - could go up to 100; so I want my process controller which is a python script sitting in Lambda to send a Queue Message - Based on this Queue message the stored procedure in Aurora will be started\nI am looking at this for the following reasons\n\nI do not want too much time lag between starting two exports\nI also do not want two exports overlapping in execution time","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":679,"Q_Id":45098004,"Users Score":0,"Answer":"I have used lambda with alembic package to create schema and structures. I know we could create users and execute other database commands - the same way execute a stored procedure \nLambda could prove to be expensive - we probably could have an container to do it","Q_Score":0,"Tags":"python,amazon-web-services,amazon-sqs,amazon-aurora","A_Id":55167030,"CreationDate":"2017-07-14T08:14:00.000","Title":"Does anyone know if we can start a storedprocedure in Aurora based on SQS","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So I have this 700 page pdf that's in black, white, and hot pink. The hot pink is both text and non-text (design elements). Is there any way to edit that one color on all the pages at once? I can do it element-by-element on adobe acrobat and page-by-page in photoshop, but those methods just seem impossibly tedious. \nI don't know much about coding but can maybe pull together something on python if I'm given great instructions. \nThanks!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":982,"Q_Id":45102833,"Users Score":0,"Answer":"Max Wyss has the best suggestion; using Acrobat's Print Production Tools.\nSpecifically you want to use the 'Convert Colors' Tool.\nThe key is the 'Conversion Attributes'.\nConvert Command: Convert to Profile\nConversion Profile: (Choose from:) Dot Gain ??% or Gray Gamma ?.?\nRendering Intent: for a gray-scale conversion like this, I lean toward 'Perceptual', but it's not a strong preference.\nYou might want to check the 'preserve black' option. \nTest your settings with a small page range before doing the entire document.","Q_Score":0,"Tags":"python,pdf,adobe,photoshop,acrobat","A_Id":45153829,"CreationDate":"2017-07-14T12:18:00.000","Title":"PDF: Change 1 color on all pages?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Django view where a user fills out and submits a form. The data is taken from this form and a document is created in an Elasticsearch index.\nMy question, is how can I test this view without impacting my Elasticsearch index? It is a development index, but I would prefer not to muddle it with unit test data.\nOne option would be to create the record in the unit test and then delete it during tear down - but, if possible, I would really like to avoid touching the index at all. \nAre there any other options?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":181,"Q_Id":45104190,"Users Score":1,"Answer":"There are a couple of different ways that could handle this:\n\nStub out the loading of Elasticsearch depedency dynamically using unittest.patch\nCreate some sort of \"seam\" into your view that allows the test to import the view and replace the elasticsearch class with a test implementation\nDefine the elastic search class in settings as a module path and switch it out for the test runs (django actually does this with a lot of its depdendencies)","Q_Score":0,"Tags":"python,django,unit-testing","A_Id":45110882,"CreationDate":"2017-07-14T13:25:00.000","Title":"Django View Unit Tests when the View Accesses an Elasticsearch Index","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We have a front-end server that is executing dags directly with the dag API (DagBag(), get_dag() and then dag_run())\nDags run fine, the problem is, that we could not find a way to execute such dags with specific arguments.\nThe closest solution was to use the Variable API, which uses set() and get() methods, but these variables are global and might have conflicts when working in concurrent operations that might use same variable names.\nHow could we run a dag and set arguments available to its execution? We are mostly using PythonOperator.\nEdit 1:\nOur program is a Python Django front end server. So, we are speaking with Airflow through another Python program. This means we trigger dags through Python, hence, using DagBag.get_dag() to retrieve information from airflow service. run_dag() does not have a way to pass direct parameters though","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1227,"Q_Id":45110781,"Users Score":0,"Answer":"If you use trigger_dag_run (through command line or from another dag) to trigger a dag, you can pass any json as payload.\nAnother option would be to store the argument list on a file, and store that file location as a Variable. The DAG can then pass this file location to python operator and the operator can then handle reading that file and parsing arguments from it.\nIf both these solutions don't work for your use case, giving more details about your dag and kind of arguments might help.","Q_Score":0,"Tags":"python,airflow","A_Id":45120003,"CreationDate":"2017-07-14T20:02:00.000","Title":"How to submit parameters to a Python program in Airflow?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm getting an Application error when running my python heroku app and the logs show:\nat=error code=H10 desc=\"App crashed\" method=GET path=\"\/favicon.ico\" host=python-blackjack.herokuapp.com request_id=38f050c2-bc7e-499a-8112-ee7d4b66bf0c fwd=\"90.205.68.255\" dyno= connect= service= status=503 bytes= protocol=https\ndoes anyone know the issue\/s \nthanks","AnswerCount":2,"Available Count":2,"Score":-0.0996679946,"is_accepted":false,"ViewCount":88,"Q_Id":45110936,"Users Score":-1,"Answer":"This is a very generic error and question without providing any code. But the most I can see is that you're missing a favicon.ico. Just make one and add it to your project root.","Q_Score":0,"Tags":"python,heroku","A_Id":45110978,"CreationDate":"2017-07-14T20:12:00.000","Title":"Heroku web app deployment error","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm getting an Application error when running my python heroku app and the logs show:\nat=error code=H10 desc=\"App crashed\" method=GET path=\"\/favicon.ico\" host=python-blackjack.herokuapp.com request_id=38f050c2-bc7e-499a-8112-ee7d4b66bf0c fwd=\"90.205.68.255\" dyno= connect= service= status=503 bytes= protocol=https\ndoes anyone know the issue\/s \nthanks","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":88,"Q_Id":45110936,"Users Score":0,"Answer":"This most likely has nothing to do with favicon.ico. H10 App Crashed means your server could not start, and every request sent to it is erring out. \nI recommend to use heroku restart, and look in the logs what is causing server to die on startup.","Q_Score":0,"Tags":"python,heroku","A_Id":45112975,"CreationDate":"2017-07-14T20:12:00.000","Title":"Heroku web app deployment error","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In my pyramid app it's useful to be able to log in as any user (for test\/debug, not in production). My normal login process is just a simple bcrypt check against the hashed password.\nWhen replicating user-submitted bug reports I found it useful to just clone the sqlite database and run a simple script which would change everyone's password to a fixed string (just for local testing). Now that I'm switching over to postgresql that's less convenient to do, and I'm thinking of installing a backdoor to my login function.\nBasically I wish to check os.environ (set from the debug.wsgi file which is loaded by apache through mod_wsgi) for a particular variable 'debug'. If it exists then I will allow login using any password (for any user), bypassing the password check.\nWhat are the security implications of this? As I understand it, the wsgi file is sourced once when apache loads up, so if the production.wsgi file does not set that particular variable, what's the likelihood of an attacker (or incompetent user) spoofing it?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":64,"Q_Id":45112983,"Users Score":1,"Answer":"In order to instantiate the server application with that debug feature in environment, the attacker would have to have the hand over your webserver, most probably with administrative privileges.\nFrom an outside process, an attacker cannot modify the environment of the running server, which is loaded into memory, without at least debug capabilities and a good payload for rewriting memory. It would be easier to just reload the server or try executing a script within it.\nI think you are safe the way you go. If you are paranoid, ensure to isolate (delete) the backdoor from the builds to production.","Q_Score":2,"Tags":"python,security,pyramid,environment,dev-to-production","A_Id":45113051,"CreationDate":"2017-07-14T23:42:00.000","Title":"Security implications of a pyramid\/wsgi os.environ backdoor?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to build a web application that requires intensive mathematical calculations. Can I use Django to populate python charts and pandas dataframe?","AnswerCount":1,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":7691,"Q_Id":45117857,"Users Score":6,"Answer":"You can use any framework to do so. If you worked with Python before I can recommend using Django since you have the same (clear Python) syntax along your project. This is good because you keep the same logic everywhere but should not be your major concern when it comes to choosing the right framework for your needs. So for example if you are a top Ruby-On-Rails developer I would not suggest to learn Django just because of Pandas. \nIn general: A lot of packages\/libraries are written in other languages but you will still be able to use them in Django\/Python. So for example the famous \"Elasticsearch\" Searchbackend has its roots in JAVA but is still used in a lot of Django apps. \nBut it also goes the other way around \"Celery\" is written in Python but can be used in Node.js or PHP. There are hundreds of examples but I think you get the Point. \nI hope that I brought some light into the darkness. If you have questions please leave them in the comments.","Q_Score":1,"Tags":"python,django,pandas,numpy","A_Id":45118234,"CreationDate":"2017-07-15T11:49:00.000","Title":"Can Django work well with pandas and numpy?","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is there anything specific that can be done to help make a Django Channels server less susceptible to light or accidental DDoS attack or general load increase from websocket\/HTTP clients? Since Channels is not truly asynchronous (still workers behind the scenes), I feel like it would be quite easy to take down a Channels-based website - even with fairly simple hardware. I'm currently building an application on Django Channels and will run some tests later to see how it holds up.\nIs there some form of throttling built in to Daphne? Should I implement some application-level throttling? This would still be slow since a worker still handles the throttled request, but the request can be much faster. Is there anything else I can do to attempt to thwart these attacks? \nOne thought I had was to always ensure there are workers designated for specific channels - that way, if the websocket channel gets overloaded, HTTP will still respond.\nEdit: I'm well aware that low-level DDoS protection is an ideal solution, and I understand how DDoS attacks work. What I'm looking for is a solution built in to channels that can help handle an increased load like that. Perhaps the ability for Daphne to scale up a channel and scale down another to compensate, or a throttling method that can reduce the weight per request after a certain point. \nI'm looking for a daphne\/channels specific answer - general answers about DDoS or general load handling are not what I'm looking for - there are lots of other questions on SO about that.\nI could also control throttling based on who's logged in and who is not - a throttle for users who are not logged in could help.\nEdit again: Please read the whole question! I am not looking for general DDoS mitigation advice or explanations of low-level approaches. I'm wondering if Daphne has support for something like:\n\nThrottling\nDynamic worker assignment based on queue size\nMiddleware to provide priority to authenticated requests\n\nOr something of that nature. I am also going to reach out to the Channels community directly on this as SO might not be the best place for this question.","AnswerCount":5,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":1825,"Q_Id":45122724,"Users Score":0,"Answer":"DDoS = Distributed Denial of Service\nThe 'Distributed' part is the key: you can't know you're being attacked by 'someone' in particular, because requests come from all over the place.\nYour server will only accept a certain number of connections. If the attacker manages to create so many connections that nobody else can connect, you're being DDoS'ed.\nSo, in essence you need to be able to detect that a connection is not legit, or you need to be able to scale up fast to compensate for the limit in number of connections. \nGood luck with that! \nDDoS protection should really be a service from your cloud provider, at the load balancer level.\nCompanies like OVH use sophisticated machine learning techniques to detect illegitimate traffic and ban the IPs acting out in quasi-real time. \nFor you to build such a detection machinery is a huge investment that is probably not worth your time (unless your web site is so critical and will lose millions of $$$ if it's down for a bit)","Q_Score":21,"Tags":"python,django,websocket,django-channels","A_Id":45270805,"CreationDate":"2017-07-15T21:05:00.000","Title":"Load spike protection for Django Channels","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is there anything specific that can be done to help make a Django Channels server less susceptible to light or accidental DDoS attack or general load increase from websocket\/HTTP clients? Since Channels is not truly asynchronous (still workers behind the scenes), I feel like it would be quite easy to take down a Channels-based website - even with fairly simple hardware. I'm currently building an application on Django Channels and will run some tests later to see how it holds up.\nIs there some form of throttling built in to Daphne? Should I implement some application-level throttling? This would still be slow since a worker still handles the throttled request, but the request can be much faster. Is there anything else I can do to attempt to thwart these attacks? \nOne thought I had was to always ensure there are workers designated for specific channels - that way, if the websocket channel gets overloaded, HTTP will still respond.\nEdit: I'm well aware that low-level DDoS protection is an ideal solution, and I understand how DDoS attacks work. What I'm looking for is a solution built in to channels that can help handle an increased load like that. Perhaps the ability for Daphne to scale up a channel and scale down another to compensate, or a throttling method that can reduce the weight per request after a certain point. \nI'm looking for a daphne\/channels specific answer - general answers about DDoS or general load handling are not what I'm looking for - there are lots of other questions on SO about that.\nI could also control throttling based on who's logged in and who is not - a throttle for users who are not logged in could help.\nEdit again: Please read the whole question! I am not looking for general DDoS mitigation advice or explanations of low-level approaches. I'm wondering if Daphne has support for something like:\n\nThrottling\nDynamic worker assignment based on queue size\nMiddleware to provide priority to authenticated requests\n\nOr something of that nature. I am also going to reach out to the Channels community directly on this as SO might not be the best place for this question.","AnswerCount":5,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":1825,"Q_Id":45122724,"Users Score":0,"Answer":"Theres a lot of things you cant to do about DDOS..however there are some neat 'tricks' depending on how much resources you have at your disposal, and how much somebody wants to take you offline.\nAre you offering a total public service that requires direct connection to the resource you are trying to protect?\nIf so, you just going to need to 'soak up' DDOS with the resources you have, by scaling up and out... or even elastic... either way it's going to cost you money!\nor make it harder for the attacker to consume your resources. There are number of methods to do this. \nIf you service requires some kind of authentication, then separate your authentication services from the resource you are trying to protect.\nMany applications, the authentication and 'service' run on the same hardware. thats a DOS waiting to happen.\nOnly let fully authenticated users access the resources you are trying to protect with dynamic firewall filtering rules. If your authenticated then gate to the resources opens (with a restricted QOS in place) ! If your a well known, long term trusted users, then access the resource at full bore.\nHave a way of auditing users resource behaviour (network,memory,cpu) , if you see particular accounts using bizarre amounts, ban them, or impose a limit, finally leading to a firewall drop policy of their traffic. \nWork with an ISP that can has systems in place that can drop traffic to your specification at the ISP border.... OVH are your best bet. an ISP that exposes filter and traffic dropping as an API, i wish they existed... basically moving you firewall filtering rules to the AS border... niiiiice! (fantasy)\nIt won't stop DDOS, but will give you a few tools to keep resources wasted a consumption by attackers to a manageable level. DDOS have to turn to your authentication servers... (possible), or compromise many user accounts.... at already authenticated users will still have access :-)\nIf your DDOS are consuming all your ISP bandwidth, thats a harder problem, move to a larger ISP! or move ISP's... :-). Hide you main resource, allow it to be move dynamically, keep on the move! :-). \nBreak the problem into pieces... apply DDOS controls on the smaller pieces. :-)\nI've tried a most general answer, but there are a lot a of depends, each DDOS mitigation requires a bit of Skin, not tin approach.. Really you need a anti-ddos ninja on your team. ;-)\nTake a look at distributed protocols.... DP's maybe the answer for DDOS. \nHave fun.","Q_Score":21,"Tags":"python,django,websocket,django-channels","A_Id":45345786,"CreationDate":"2017-07-15T21:05:00.000","Title":"Load spike protection for Django Channels","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is there anything specific that can be done to help make a Django Channels server less susceptible to light or accidental DDoS attack or general load increase from websocket\/HTTP clients? Since Channels is not truly asynchronous (still workers behind the scenes), I feel like it would be quite easy to take down a Channels-based website - even with fairly simple hardware. I'm currently building an application on Django Channels and will run some tests later to see how it holds up.\nIs there some form of throttling built in to Daphne? Should I implement some application-level throttling? This would still be slow since a worker still handles the throttled request, but the request can be much faster. Is there anything else I can do to attempt to thwart these attacks? \nOne thought I had was to always ensure there are workers designated for specific channels - that way, if the websocket channel gets overloaded, HTTP will still respond.\nEdit: I'm well aware that low-level DDoS protection is an ideal solution, and I understand how DDoS attacks work. What I'm looking for is a solution built in to channels that can help handle an increased load like that. Perhaps the ability for Daphne to scale up a channel and scale down another to compensate, or a throttling method that can reduce the weight per request after a certain point. \nI'm looking for a daphne\/channels specific answer - general answers about DDoS or general load handling are not what I'm looking for - there are lots of other questions on SO about that.\nI could also control throttling based on who's logged in and who is not - a throttle for users who are not logged in could help.\nEdit again: Please read the whole question! I am not looking for general DDoS mitigation advice or explanations of low-level approaches. I'm wondering if Daphne has support for something like:\n\nThrottling\nDynamic worker assignment based on queue size\nMiddleware to provide priority to authenticated requests\n\nOr something of that nature. I am also going to reach out to the Channels community directly on this as SO might not be the best place for this question.","AnswerCount":5,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":1825,"Q_Id":45122724,"Users Score":0,"Answer":"Let's apply some analysis to your question. A DDoS is like a DoS but with friends. If you want to avoid DDoS explotation you need minimize DoS possibilities. Thanks capitan obvious.\nFirst thing is to do is make a list with what happens in your system and wich resources are affected:\n\nA tcp handshake is performed (SYN_COOKIES are affected)\nA ssl handshake comes later (entropy, cpu)\nA connection is made to channel layer...\n\nThen monitorize each resource and try to implement a counter-measure:\n\nProtect to SYN_FLOOD configuring your kernel params and firewall\nUse entropy generators\nConfigure your firewall to limit open\/closed connection in short time (easy way to minimize ssl handshakes)\n...\n\nSeparate your big problem (DDoS) in many simple and easy to correct tasks. Hard part is get a detailed list of steps and resources.\nExcuse my poor english.","Q_Score":21,"Tags":"python,django,websocket,django-channels","A_Id":45558858,"CreationDate":"2017-07-15T21:05:00.000","Title":"Load spike protection for Django Channels","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I think that this problem is due to the python version. I used Anaconda with python 3.6 for learning django. Now I've to work on google app engine using python2.7. I uninstalled anaconda. Now when i run \"python\" I get:\n\"Python 3.6.1 |Continuum Analytics, Inc.| (default, May 11 2017, 13:09:58)\".\nIs there a way to default back to python2.7?\nI'm on ubuntu 16.04\nedit: problem is not due to python version","AnswerCount":3,"Available Count":1,"Score":-0.0665680765,"is_accepted":false,"ViewCount":3516,"Q_Id":45130283,"Users Score":-1,"Answer":"For those who are using Windows and still facing the same issue, the easiest way is to remove all the other python versions except version 2.7x.","Q_Score":1,"Tags":"python,google-app-engine,ubuntu,anaconda,google-app-engine-python","A_Id":54668398,"CreationDate":"2017-07-16T15:28:00.000","Title":"When I run localserver on googleappengine error is \"File \"~\/dev_appserver.py\", line 102, in  assert sys.version_info[0] == 2 AssertionError\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a CKAN 2.6.2 installation deployed with a few hundred datasets added using python via the API, including a number of custom fields, added with ckan.action.package_patch(id=i, extras=extra_fields).\nI would like to make one of these extra fields visible only if a user has logged in to the organization.\nI think either src\/ckan\/ckan\/templates\/package\/snippets\/additional_info.html or src\/ckan\/ckan\/templates\/snippets\/additional_info.html are the templates used to generate the lines of HTML that I'd like to selectively filter, but I'm stuck on the next step.\nCan anyone help with some pointers?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":137,"Q_Id":45133278,"Users Score":1,"Answer":"Extend PackageController, define custom route and from there you will need to call organization_list_for_user action that will return the organizations that user is member of, and choose which extras you will return depending if user is member of organization or not.","Q_Score":0,"Tags":"python,ckan","A_Id":45255776,"CreationDate":"2017-07-16T21:01:00.000","Title":"Ckan - require login to view certain metadata","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am going to 3.6 now....\n1) I see for my worker servers ...in 2.7 I used gevent with great success for running one worker per core with N gevent threads per core...\n2) For my web dev..for low level..close to CGI as possible I used bottle with nginx\/uWSGI with the gevent loop\n3) For api's I used Flask with nginx\/uWSGI with the gevent loop\nMy api apps are screaming fast...and faster then nodejs for async calls to my backend databases...\nEnter 3.6 ... I am confused....\n1) It appears I can run my workers using asyncio since not dependent on a framework...so here I am OK\n2) It appears that gevent is available for 3.6 and I assume I can still use gevent for flask with  the nginx\/uWSGI with the gevent loop \n3) uWSGI supports asyncio\n4) flask support for asyncio does not seem to be widely supported\n5) I refuse to use Django ...so dont event go there.. :)\nSo my question is that if I want to embrace asyncio with 3.6 is it bye-bye Flask in favor of e.g. aiohttp or sanic?\nOn other words...those that build async api's for python 2.7 how did you transition to 3.6 while maintaining non blocking calls?\nIt appears that I can still use gevent with flask with python 3 but this is a monkey patch to force async non blocking calls whereas asyncio is native and part of the STL...\nThanks","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":840,"Q_Id":45136647,"Users Score":0,"Answer":"It's better to go with asyncio preferably aiohttp which is more mainstream.","Q_Score":0,"Tags":"python,python-3.x,flask,python-asyncio,gevent","A_Id":45175533,"CreationDate":"2017-07-17T05:38:00.000","Title":"New to python 3.6 from 2.7 - is flask still relevant for async calls with gevent?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am going to 3.6 now....\n1) I see for my worker servers ...in 2.7 I used gevent with great success for running one worker per core with N gevent threads per core...\n2) For my web dev..for low level..close to CGI as possible I used bottle with nginx\/uWSGI with the gevent loop\n3) For api's I used Flask with nginx\/uWSGI with the gevent loop\nMy api apps are screaming fast...and faster then nodejs for async calls to my backend databases...\nEnter 3.6 ... I am confused....\n1) It appears I can run my workers using asyncio since not dependent on a framework...so here I am OK\n2) It appears that gevent is available for 3.6 and I assume I can still use gevent for flask with  the nginx\/uWSGI with the gevent loop \n3) uWSGI supports asyncio\n4) flask support for asyncio does not seem to be widely supported\n5) I refuse to use Django ...so dont event go there.. :)\nSo my question is that if I want to embrace asyncio with 3.6 is it bye-bye Flask in favor of e.g. aiohttp or sanic?\nOn other words...those that build async api's for python 2.7 how did you transition to 3.6 while maintaining non blocking calls?\nIt appears that I can still use gevent with flask with python 3 but this is a monkey patch to force async non blocking calls whereas asyncio is native and part of the STL...\nThanks","AnswerCount":2,"Available Count":2,"Score":0.1973753202,"is_accepted":false,"ViewCount":840,"Q_Id":45136647,"Users Score":2,"Answer":"Flask + gevent works like a charm for python 3.6. There is no any close solution to Flask-Admin and other robust time-tested libraries (like SQLAlchemy). For real applications I can get the same amount of rps from a flask as for aiohttp or sanic or whatever.","Q_Score":0,"Tags":"python,python-3.x,flask,python-asyncio,gevent","A_Id":45570572,"CreationDate":"2017-07-17T05:38:00.000","Title":"New to python 3.6 from 2.7 - is flask still relevant for async calls with gevent?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"i try to run my android test script by \"monkeyrunner cameraTest.py\"\nbut it can't work, the cmd show me this \nSWT folder '..\\framework\\x86' does not exist.\nPlease set ANDROID_SWT to point to the folder containing swt.jar for your platform.\nanyone know how to deal with this\uff1fthanks","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2025,"Q_Id":45163450,"Users Score":0,"Answer":"In addition to @ohbo's solution, copying AdbWinApi.dll, AdbWinUsbApi.dll into framework folder solved my problem.","Q_Score":2,"Tags":"java,android,python,testing,monkeyrunner","A_Id":49088774,"CreationDate":"2017-07-18T10:00:00.000","Title":"SWT folder '..\\framework\\x86' does not exist. Please set ANDROID_SWT to point to the folder containing swt.jar for your platform","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am halfway in the development of a large Flask web application.\nBack in the beginning I chose not to use test-driven-development, for learning curve vs project deadline reasons.\nThus these last weeks I had the opportunity to learn more about it, and I am quite exited about starting to use it.\nHowever, regarding I didn't wrap my project with TDD from the start, is there any cons of starting to use it now ?\nI would not refactor my entire app, only the new features I am going to design in the near future.","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":140,"Q_Id":45169563,"Users Score":0,"Answer":"Agree with the previous answer. Yes, you can start using TDD at every single point of development.\nWhen you try the 'red line' tests which should fall at the beginning there is no surprise for you that they show up lack of functionality. \nWhen you start implementing TDD on the big system with a huge amount of code already in you should check first for some functionality availability by also writing the test (or the group of tests). Then if it works well you carry on until the test start showing up the limits of code's potential.\nWould add that if you start now and decide to cover not only the new features (but the old ones as well as mentioned above) at this point you more likely will spend more time for the old features.\nAnd in that case it would not be called pure TDD (just saying) since some tests is going to be implemented after the code has been written but if it's suitable for the project that's also the option (definitely could worth it). And still it's most likely better to test something now than on the beta-testing stage. At least because it will be easier to come across the solution if you find something is going wrong with your old features. \nSo later you test so harder it's getting to solve the issues. It takes more time then. And if the people apply tests long time after the code has been written it comes to the double work since you need to rethink how your code works. That`s why in the TDD writing the tests goes almost along with writing the code. Even at this point it's probably easier for you to remember what you were coding at the beginning.","Q_Score":3,"Tags":"python,unit-testing,testing,tdd","A_Id":45198217,"CreationDate":"2017-07-18T14:24:00.000","Title":"Starting TDD halfway a project, good practice?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am halfway in the development of a large Flask web application.\nBack in the beginning I chose not to use test-driven-development, for learning curve vs project deadline reasons.\nThus these last weeks I had the opportunity to learn more about it, and I am quite exited about starting to use it.\nHowever, regarding I didn't wrap my project with TDD from the start, is there any cons of starting to use it now ?\nI would not refactor my entire app, only the new features I am going to design in the near future.","AnswerCount":3,"Available Count":2,"Score":0.1973753202,"is_accepted":false,"ViewCount":140,"Q_Id":45169563,"Users Score":3,"Answer":"TDD \"done right\" is always good practice - no matter at which point in time you start using it.\nBut in order to avoid getting to a situation where one part of the code base is nicely unit-tested and others are not: look for ways to not only cover new features. In other words: if time allows don't only test those parts of a file\/class that a new feature will go into - but instead try to get that whole unit into \"tests\". \nThe core aspect of unit tests is that they allow you to make changes to your code base without breaking things. Unit tests enable you to go with higher speed. Thus look for ways to ensure that you can go with \"high speed\" for the majority of your code base.","Q_Score":3,"Tags":"python,unit-testing,testing,tdd","A_Id":45183671,"CreationDate":"2017-07-18T14:24:00.000","Title":"Starting TDD halfway a project, good practice?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"There are a bunch of tools out there like pyInstaller, py2exe, etc. But none of them seems to work while making a Windows standalone executable for a Flask application.\nCan someone guide me with proper instructions as to how one can create executable for a Flask application? I want to distribute the application as single clickable exe for end users.\nTo be specific, the application has following dependencies.\n- Flask\n- Sqlalchemy\n- Requests\n- Httplib2\n- Database used is SQLite\nI don't want to open the code as of now, but if someone has a good solution, I can send the project repo privately for testing purposes.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":2222,"Q_Id":45182755,"Users Score":1,"Answer":"Instead of trying to create a standalone executable for a flask app in windows, you should use docker in order to containerize\/package your flask app (if it must be packaged). \nDocker will give you something that is system agnostic, is well understood to work, and is in line with best practices.","Q_Score":2,"Tags":"python,flask","A_Id":45182963,"CreationDate":"2017-07-19T06:42:00.000","Title":"How to make windows standalone exe for python flask\/jinja\/sqlite application","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to store json objects on the google cloud platform.  I have considered a number of options:\n\nStore them in a bucket as a text (.json) file.\nStore them as text in datastore using json.dumps(obj).\nUnpack it into a hierarchy of objects in datastore.\n\nOption 1: Rejected because it has no organising principles other than the filename and cannot be searched across.\nOption 2: Is easy to implement, but you cannot search using dql.\nOption 3: Got it to work after a lot of wrangling with the key and parent key structures.  While it is searchable, the resulting objects have been split up and held together by the parent key relationships.  It is really ugly!\nIs there any way to store and search across a deeply structured json object on the google cloud platform - other than to set up mongodb in a compute instance?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1421,"Q_Id":45184482,"Users Score":0,"Answer":"I don't know what your exact searching needs are, but the datastore API allows for querying that is decently good, provided you give the datastore the correct indexes. Plus it's very easy to go take the entities in the datastore and pull them back out as .json files.","Q_Score":1,"Tags":"json,python-2.7,google-app-engine,google-cloud-datastore","A_Id":45204510,"CreationDate":"2017-07-19T08:05:00.000","Title":"Storing json objects in google datastore","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"I tried to launch a Django 1.11 project on production server. When I start the app I see the following error:\n\nInvalid HTTP_HOST header: 'bla-bla-bla.bla-bla-vla.com'. You may need to add u'bla-bla-bla.bla-bla-vla.com' to ALLOWED_HOSTS**\n\nBut, host \"bla-bla-bla.bla-bla-vla.com\" has been added to ALLOWED_HOSTS in settings.py already! \nI tried to switch DEBUG from False to True and back. It works fine, then.\nWhat am I doing wrong?","AnswerCount":5,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":57463,"Q_Id":45194182,"Users Score":0,"Answer":"Also, if you have a service like gunicorn between your localhost and your nginx server or apache2 server. Remember to restart it too.\nsudo systemctl restart gunicorn","Q_Score":14,"Tags":"python,django,django-1.11","A_Id":71277812,"CreationDate":"2017-07-19T14:52:00.000","Title":"ALLOWED_HOSTS and Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've been learning the basics of python (first language for me) over the last few months.\nI now want to try doing something practical and get into using Django. I'm finding the setup process extremely difficult (thank god for youtube tutorials).\nI've installed python, pip, django and virtualenv. EDIT: Have double checked and these are all installed.\nI activated my first project:\n PS C:\\Users---\\Desktop\\first_project> virtualenv first_project\nUsing base prefix 'c:\\users\\---\\anaconda3'\nAs soon as I try to run the server:\npython manage.py runserver\nI get the ImportError - \"ImportError: Couldn't import Django. Are you sure it's installed and available on your PYTHONPATH environment variable? Did you forget to activate a virtual environment?\".\nI'm using Windows 10..any idea what the problem might be?\nThanks in advance.","AnswerCount":1,"Available Count":1,"Score":-0.1973753202,"is_accepted":false,"ViewCount":2725,"Q_Id":45197710,"Users Score":-1,"Answer":"I've got the same problem like as you. \nIf you have installed django by easy_install method in powershell and the django is installed in C:\\Program Files\\Python36\\Lib\\site-packages\\django-1.11.5-py3.6.egg\nI've solved the issue by writing the below line in between import sys and import django in manage.py\nsys.path.append(\"C:\\Program Files\\Python36\\Lib\\site-packages\\django-1.11.5-py3.6.egg\") \nor else try executing the following command :\npython -m pip install django","Q_Score":0,"Tags":"python,django,installation","A_Id":46387180,"CreationDate":"2017-07-19T17:51:00.000","Title":"Setting up Django first_project - \"ImportError - Did you forget to activate a virtual environment?\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"After doing a query in a Django script I wrote, I was given this Q object.\n<Q: (AND: ('lesson_object_id__in', [322, 327, 328, 329, 330, 332, 1120, 1176]))>\nI want to break down that Q object so I only have the list [322, 327, 328, 329, 330, 332, 1120, 1176]. How would I go by doing that? Thanks","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":110,"Q_Id":45198716,"Users Score":1,"Answer":"I had it wrapped in the Q() parentheses. Duplicating the query and storing it in the variable list(lesson_ids) fixed it.","Q_Score":1,"Tags":"python,django,django-queryset","A_Id":45198887,"CreationDate":"2017-07-19T18:46:00.000","Title":"Break Down Django Query object (Q)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to create a web interface to display some data that is being extracted live from a piece of hardware.\nI have already written a program using pyQt that extracts data every second. I was wondering if it is possible to simultaneously push this data to a web interface with Python.\nI want the webpage to not continuously refresh as data is coming in every second. Charts are essential, I have to have the ability to plot the data that is being pushed.\nCan anyone suggest me how I would go about doing this?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":183,"Q_Id":45205559,"Users Score":0,"Answer":"Probably the most conventional way to go about this would be to write some server-side code to communicate with the device, and save responses (all of them? the most recent n?) to a database. You'd expose this to a REST API, which you'd then call at a specified interval using AJAX from the browser.","Q_Score":0,"Tags":"python","A_Id":45205670,"CreationDate":"2017-07-20T05:02:00.000","Title":"creating a web interface that displays live data from hardware","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm new to django and have a virtualenv outside my django project directory. \nWhen I download open source django apps like python_social_auth using pip install, the apps reside in the virtualenv's site-packages directory and not in the project root. But I import them in my projects. Should I keep a copy of the downloaded apps in my projects root? Would that be necessary if I wanted to deploy the project?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":237,"Q_Id":45210357,"Users Score":3,"Answer":"No. The libraries are not part of your code and shouldn't live in your project directory. They're dependencies, and should be installed by pip when you deploy just as in your development environment.","Q_Score":0,"Tags":"python,django,pip,virtualenv","A_Id":45210417,"CreationDate":"2017-07-20T09:14:00.000","Title":"I'm confused with django project root and the virtualenv. Please guide","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am running a Gunicorn server with a Flask web app.  I use the following command to start the server\ngunicorn -c \/config\/serverConfig.py app:APP\nInside serverConfig.py, I have timeout = 180\nHowevever, the long running calls timeout after 120 seconds.\nIs there something I should be doing differently?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":399,"Q_Id":45224390,"Users Score":0,"Answer":"My app is running on a container group on the Bluemix cloud, and there is a 120s time out limit for the load balancer in front of the container.  This was overriding whatever timeout I had in my app.","Q_Score":1,"Tags":"python,gunicorn","A_Id":45306560,"CreationDate":"2017-07-20T20:14:00.000","Title":"Gunicorn timeout not working","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am developing a skill for Amazon Alexa and I'm using DynamoDB for storing information about the users favorite objects. I would like 3 columns in the database:\n\nAlexa userId\nObject\nColor\n\nI currently have the Alexa userId as the primary key. The problem that I am running into is that if I try to add an entry into the db with the same userId, it overwrites the entry already in there. How can I allow a user to have multiple objects associated with them in the db by having multiple rows? I want to be able to query the db by the userId and receive all the objects that they have specified. \nIf I create a unique id for every entry, and there are multiple users, I can't possibly know the id to query by to get the active users' objects.","AnswerCount":5,"Available Count":2,"Score":0.0399786803,"is_accepted":false,"ViewCount":10290,"Q_Id":45227546,"Users Score":1,"Answer":"DynamoDB is a NoSQL-like, document database, or key-value store; that means, you may need to think about your tables differently from RDBMS. From what I understand from your question, for each user, you want to store information about their preferences on a list of objects; therefore, keep your primary key simple, that is, the user ID. Then, have a singe \"column\" where you store all the preferences. That can either be a list of of tuples (object,color) OR a dictionary of unique {object:color}.\nWhen you explore the items in the web UI, it will show these complex data structures as json-like documents which you can expand as you will.","Q_Score":9,"Tags":"python,amazon-web-services,amazon-dynamodb,alexa-skills-kit","A_Id":45266031,"CreationDate":"2017-07-21T01:26:00.000","Title":"How to create multiple DynamoDB entries under the same primary key?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am developing a skill for Amazon Alexa and I'm using DynamoDB for storing information about the users favorite objects. I would like 3 columns in the database:\n\nAlexa userId\nObject\nColor\n\nI currently have the Alexa userId as the primary key. The problem that I am running into is that if I try to add an entry into the db with the same userId, it overwrites the entry already in there. How can I allow a user to have multiple objects associated with them in the db by having multiple rows? I want to be able to query the db by the userId and receive all the objects that they have specified. \nIf I create a unique id for every entry, and there are multiple users, I can't possibly know the id to query by to get the active users' objects.","AnswerCount":5,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":10290,"Q_Id":45227546,"Users Score":0,"Answer":"you cannot create multiple entries with same primary key. Please create composite keys (multiple keys together as primary key). Please note you cannot have multiple records of same combination","Q_Score":9,"Tags":"python,amazon-web-services,amazon-dynamodb,alexa-skills-kit","A_Id":45693902,"CreationDate":"2017-07-21T01:26:00.000","Title":"How to create multiple DynamoDB entries under the same primary key?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How can I see *.py and *.pyc in RIDE (robot framework ide)?\nDoes ride support them?\nThank you in advance.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":189,"Q_Id":45228994,"Users Score":1,"Answer":"RIDE only supports text (*.txt, or *.robot), TSV (tab separated values), and HTML files.\nThe .py or .pyi files are on our wish list.\nThe .pyc does not make any sense to open in an Editor, they are byte code.","Q_Score":0,"Tags":"python,robotframework,robotframework-ide","A_Id":45238381,"CreationDate":"2017-07-21T04:29:00.000","Title":"How to see py and pyc in robot framework RIDE","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"As far as I know Django apps can't start if any of the databases set in the settings.py are down at the start of the application. Is there anyway to make Django \"lazyload\" the initial database connection? \nI have two databases configured and one of them is a little unstable and sometimes it can be down for some seconds, but it's only used for some specific use cases of the application. As you can imagine I don't want that all the application can't start because of that. Is there any solution for that?\nI'm using Django 1.6.11, and we also use Django South for database migrations (in case that it's related somehow).","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2860,"Q_Id":45240311,"Users Score":1,"Answer":"I did some more tests and problem only happens when you are using de development server python manage.py runserver. In that case, it forces a connection with the database.\nUsing an actual WSGI server it doesn't happen as @Alasdair informed.\n@JohnMoutafis in the end I didn't test your solution, but that could work.","Q_Score":6,"Tags":"python,mysql,django,django-models,django-south","A_Id":45638008,"CreationDate":"2017-07-21T14:32:00.000","Title":"Django: How to disable Database status check at startup?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"The Flask documentation describes how to install it either inside a virtualenv or system-wide. The documentation for a system-wide installation states\n\nThis is possible as well, though I do not recommend it.\n\nWhy is a system-wide installation not recommend? What problems can occur with such an installation?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":117,"Q_Id":45249896,"Users Score":1,"Answer":"The problem comes mainly if you want to run multiple different applications\/projects, they would need to use the exact same version of flask and its dependencies. Anything else would cause conflict among the libraries.\nThere's also ease of packaging for each application, by installing only what you need for the current application in the virtualenv, it acts as a delimiter (for instance, when using pip freeze --local) so you don't include global packages you might not need.\nThe principle of least privilege might come into play as well. It would be rare for even global libraries to go beyond their scope but, hey, reducing the attack surface only to what your virtualenv is can't hurt.","Q_Score":0,"Tags":"python,flask,installation","A_Id":45250691,"CreationDate":"2017-07-22T01:59:00.000","Title":"System-Wide Flask Installation","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Sorry, I don't really have much technical background and I know it sounds like a confused question. However, I will try my best to explain what I want to do in here.\nMy daily routine tasks involved lots of digital marketing data (very large data >20GB+) from different types of platform. As you can see, when I try to analyze these data, I need to aggregate these data into a similar format. The tedious part of my job is it normally involved lots of manual downloads, lots of data cleansing, and lots of upload(I upload the cleaned data to Google Cloud Storage so I can use BigQuery!).\nI feel do these tasks manually are extremely inefficient, and I think the only logical choice is automate these tasks on Google Cloud Platform.\nAfter months of effort, I am managed to do these tasks in semi-auto fashion, which I wrote some python programs and make a schtask batch for following:\n\nDownload (A python program makes API calls to download platform data to my local drive)\nCleansing (A python program cleansing these data locally) \nUpload to Cloud Storage (A python program upload \"cleaned\" data using gsutil)\n\nAlthough, it saved lots of my time, but everything is still done locally on my desktop PC.\nHere are my real questions, I am sure there is a way to manage all these tasks (download, cleansing, upload) in Google Cloud without touching my local PC, where should I start?\n\nHow can I run these Python program on Google Cloud? I know that I can deploy these Python programs in App Engine, however, to allow these program to do their jobs, do I also need a compute engine? or simple deployment would do the job?\nHow do I schtask for these apps on Google Cloud?\nI know Cloud Storage is only one of many ways to store the data on GCP, since I have these data from different types of platform, and they are all in different formats and metrics. So what would be the best way to store these data efficiently on Google Cloud? CloudSQL, Datastore or BigTable?\n\nThanks!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":118,"Q_Id":45254244,"Users Score":1,"Answer":"We need more information and see some code to be able to help you better but in general the work you describe should be able to get done via http and you don't need any special C libraries, hence you could go with appengine and create task queues for your jobs. \nBe prepared that using only appengine can be trickier than having an operating system that you can leverage. There is no operating system with appengine once you've deployed, you must use only the functionality supplied in appengine. \nBut yes, as far as I can tell from the information you provide, an appengine app should be able to do the work you describe. Try writing some code, deploy the appengine app and get back here and ask if you have specific trouble. \nYou can always add compute engine to your appengine project if you need it later.","Q_Score":2,"Tags":"python,google-app-engine,google-cloud-datastore,google-cloud-platform,google-cloud-storage","A_Id":45258584,"CreationDate":"2017-07-22T11:53:00.000","Title":"Google Cloud: Do we need a compute engine to run a deployed python code?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a basic nodejs app that works fine on its own on heroku, but I want to add a python script that nodejs will call that uses a numpy package. I have gotten it to work on my local host but I am struggling to get it to work on heroku as it does not recognise the numpy package and I cannot seem to install it with pip as it does not get recognised either.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":717,"Q_Id":45254735,"Users Score":6,"Answer":"All I had to do was add a requirements.txt file to my project and run: heroku buildpacks:add --index 1 heroku\/python -a appname","Q_Score":3,"Tags":"python,node.js,heroku","A_Id":45299479,"CreationDate":"2017-07-22T12:47:00.000","Title":"How to deploy a nodejs app that uses python scripts on heroku","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I use Django 1.11, PostgreSQL 9.6 and Django migration tool. I couldn't have found a way to specify the column orders. In the initial migration, changing the ordering of the fields is fine but what about migrations.AddField() calls? AddField calls can also happen for the foreign key additions for the initial migration. Is there any way to specify the ordering or am I just obsessed with the order but I shouldn't be? \nUpdate after the discussion\nPostgreSQL DBMS doesn't support positional column addition. So it is practically meaningless to expect this facility from the migration tool for column addition.","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":5299,"Q_Id":45261303,"Users Score":11,"Answer":"AFAIK, there's no officially supported way to do this, because fields are supposed to be atomic and it shouldn't be relevant. However, it messes with my obsessive-compulsive side as well, and I like my columns to be ordered for when I need to debug things in dbshell, for example. Here's what I've found you can do:\n\nMake a migration with python manage.py makemigrations\nEdit the migration file and reorder the fields in migrations.createModel\n\nGood luck!","Q_Score":5,"Tags":"python,django,postgresql,django-models,migration","A_Id":45261424,"CreationDate":"2017-07-23T03:45:00.000","Title":"Django Migration Database Column Order","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I use Django 1.11, PostgreSQL 9.6 and Django migration tool. I couldn't have found a way to specify the column orders. In the initial migration, changing the ordering of the fields is fine but what about migrations.AddField() calls? AddField calls can also happen for the foreign key additions for the initial migration. Is there any way to specify the ordering or am I just obsessed with the order but I shouldn't be? \nUpdate after the discussion\nPostgreSQL DBMS doesn't support positional column addition. So it is practically meaningless to expect this facility from the migration tool for column addition.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":5299,"Q_Id":45261303,"Users Score":0,"Answer":"I am not 100% sure about the PostgreSQL syntax but this is what it looks like in SQL after you have created the database. I'm sure PostgreSQL would have an equivalent:\nALTER TABLE yourtable.yourmodel \nCHANGE COLUMN columntochange columntochange INT(11) NOT NULL AFTER columntoplaceunder;\nOr if you have a GUI (mysql workbench in my case) you can go to the table settings and simply drag and drop colums as you wish and click APPLY.","Q_Score":5,"Tags":"python,django,postgresql,django-models,migration","A_Id":59406349,"CreationDate":"2017-07-23T03:45:00.000","Title":"Django Migration Database Column Order","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In the configuration for my Pyhon 3.6 AWS Lambda function I set the environment variable \"PYTHONVERBOSE\" with a setting of 1\nThen in the Cloudwatch logs for my function it shows lots of messages similar to:\ncould not create '\/var\/task\/pycache\/auth.cpython-36.pyc': OSError(30, 'Read-only file system')\nIs this important? Do I need to fix it?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":868,"Q_Id":45270330,"Users Score":1,"Answer":"I don't think you can write in the \/var\/task\/ folder. If you want to write something to disk inside of the lambda runtime try the \/tmp folder.","Q_Score":1,"Tags":"python-3.x,aws-lambda","A_Id":46840601,"CreationDate":"2017-07-23T22:10:00.000","Title":"AWS Lambda Python lots of \"could not create '\/var\/task\/__pycache__\/FILENAMEpyc'\" messages","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm developing with Apache and Django an web application application where users interacts with a data model (C++ implementation wrapped into Python). \nTo avoid load \/ save data in a file or database after each user operation, I prefer keep data model in memory as long as the user is connected to the app. \nUntil now, data models are stored into a variable attached to web service. As Python running under Apache has sometimes strange behavior, I'd prefer execute user operation into separated python process, today on same server, maybe tomorrow on a different node. \nI'm under the impression that Distributed computing library (dispy, dask distributed) does not enable to keep memory attached to a node. Does anyone have a solution \/ idea about what libraries could I use ?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":65,"Q_Id":45277365,"Users Score":0,"Answer":"Simple answer : stop wasting your time trying to do complicated things that will never work right with your typical web server and store your data in a database (doesn't have to be a mysql database FWIW). \nLongest answer: in a production environment you typically have several parallel (sub)processes handling incoming requests, and any of those process can serve any user at any time, so keeping your data in memory in a process will never work reliably. This is by design and this is a sane design, so trying to fight against it is just a waste of time and energy. Web server processes are not meant to persist data before requests, that's what your database is for, so use it.","Q_Score":0,"Tags":"python,django,apache,dispy,dask-distributed","A_Id":45279560,"CreationDate":"2017-07-24T09:50:00.000","Title":"Node process with dedicated memory in Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have existing REST APIs, written using Django Rest Framework and now due to some client requirements I have to expose some of them as SOAP web services. \nI want to know how to go about writing a wrapper in python so that I can expose some of my REST APIs as SOAP web services. OR should I make SOAP web services separately and reuse code ?\nI know this is an odd situation but any help would be greatly appreciated.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":3292,"Q_Id":45279148,"Users Score":0,"Answer":"Lets Discuss both the Approaches and their pros and cons\nSeperate SOAP Service \n\nReusing Same Code -  if you are sure the code changes will not impact the two code flow ,it is good to go.\nExtension of Features - if you are sure that new feature extension will not impact other parts it is again best to go.\nScalablity - if new API are part of same application and you are sure that it will be scalable with more load ,it is again a good option.\nExtension - if you are sure in future adding more API will not create a mess of code, it is again good to go for.\n\nSoap Wrapper Using Python (my favourate and suggested way to go)\n\nSeperation of Concern with this you can make sure ,what ever code you write is sperate from main logic and you can easly plug in and plug out new things.\n\nAnswer for all the above question in case of this is YES.\nYour Call ,\nComments and critisicsm are most welcome","Q_Score":15,"Tags":"django,python-3.x,rest,soap,django-rest-framework","A_Id":45458723,"CreationDate":"2017-07-24T11:13:00.000","Title":"Write a wrapper to expose existing REST APIs as SOAP web services?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"This is a non-specific question about best practice in Django. Also note when I say \"app\" I'm referring to Django's definition of apps within a project.\nHow should you go about deciding when to use a new view and when to create an entirely new app? In theory, you can have a simple webapp running entirely on one views.py for an existing app.\nSo how do you go about deciding when to branch off to a new app or just add a new function in your views.py? Is it just whatever makes the most sense?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":28,"Q_Id":45281971,"Users Score":1,"Answer":"It totally depends on your application.\nIf you are an only developer working on project .\nIt is advisable to write one view for each web page or event.\nIf you have multiple developers in your house you can split the view if you want to make a part of it reusable or something like that.\nAgain its all about how your team work,better stick to the same style for the entire project\nall the best","Q_Score":0,"Tags":"python,django","A_Id":45282175,"CreationDate":"2017-07-24T13:29:00.000","Title":"When To Use A View Vs. A New Project","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using python-flask and firebase-admin (for authentication) in my mobile app backend. I'm deploying my code to AWS Elastic Beanstalk. Everything is fine until I install the firebase-admin through \"pip install firebase-admin\".\nI've committed changed to git.\nNow, the deployment fails and displays the following message.\n*MacBook-Pro:pets-friend-api santosh.guruju$ eb deploy\nWARNING: Git is in a detached head state. Using branch \"default\".\nWARNING: Git is in a detached head state. Using branch \"default\".\nWARNING: Git is in a detached head state. Using branch \"default\".\nWARNING: Git is in a detached head state. Using branch \"default\".\nWARNING: Git is in a detached head state. Using branch \"default\".\nCreating application version archive \"app-d517-170725_142037\".\nUploading PetsFrenzAPI\/app-d517-170725_142037.zip to S3. This may take a while.\nUpload Complete.\nINFO: Environment update is starting.\nINFO: Deploying new version to instance(s).\nERROR: Your requirements.txt is invalid. Snapshot your logs for details.\nERROR: [Instance: i-054100c8ffb51643c] Command failed on instance. Return code: 1 Output: (TRUNCATED)...)\n  File \"\/usr\/lib64\/python2.7\/subprocess.py\", line 541, in check_call\n    raise CalledProcessError(retcode, cmd)\nCalledProcessError: Command '\/opt\/python\/run\/venv\/bin\/pip install -r \/opt\/python\/ondeck\/app\/requirements.txt' returned non-zero exit status 1. \nHook \/opt\/elasticbeanstalk\/hooks\/appdeploy\/pre\/03deploy.py failed. For more detail, check \/var\/log\/eb-activity.log using console or EB CLI.\nINFO: Command execution completed on all instances. Summary: [Successful: 0, Failed: 1].\nERROR: Unsuccessful command execution on instance id(s) 'i-054100c8ffb51643c'. Aborting the operation.\nERROR: Failed to deploy application.*","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":471,"Q_Id":45295727,"Users Score":0,"Answer":"I've Fixed it!\nAs it states the problem is in Requirements.txt.\nInstead of>> pip freeze > requirement.txt\nJust added limited resources in the requirements file without version.\nfix:requirement.txt contains \nflask\nflask_sqlalchemy\nfirebase_admin\npymysql","Q_Score":1,"Tags":"python,amazon-web-services,flask,amazon-elastic-beanstalk,firebase-admin","A_Id":45299181,"CreationDate":"2017-07-25T06:42:00.000","Title":"Firebase-admin:- Deployment Failed: ERROR: Your requirements.txt is invalid. Snapshot your logs for details.","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using the elasticsearch-dsl library to define mappings in elasticsearch and to index django model objects. For initial indexing I, however, want to use json data for all models. Is there a way to instantiate DocType subclass objects directly from json or from a python dict?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":762,"Q_Id":45297258,"Users Score":2,"Answer":"You can always do MyDoc(**my_dict)","Q_Score":1,"Tags":"python,json,django,elasticsearch-dsl","A_Id":45313746,"CreationDate":"2017-07-25T07:58:00.000","Title":"Creating elasticsearch-dsl DocType objects from dict or json","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm writing a module in odoo. I hve defined some parent products and their child products. I want to do, when I'm selecting a parent product from many2one field, this parent product's childs will open in Treeview lines automatically. This tree view field is defined as one2many field. \nI used onchange_parent_product funtion, also added filter according to parent_product_id. \nBut treeview nothing show when I select a parent product.. \nPlease help me how can I fill treeview lines automatically ?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":433,"Q_Id":45298393,"Users Score":0,"Answer":"to use one2many field you need many2one field in products\nto this new model that you create. to make it easy use many2many\nfield it's better that way and use onchange to fill it.\njust search for product that have parent_id equals to the selected\n  product and add this record to your many2many field.\nif you need to keep it using o2m field it's better to add more code \nto see what you did and what is the many2one field that you added\nin your product to your new model.","Q_Score":0,"Tags":"python,treeview,openerp,one2many","A_Id":45298797,"CreationDate":"2017-07-25T08:53:00.000","Title":"How to autofill child produts in treeview, when parent product (BOM) is selected in odoo?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a django sql explorer which is running with 5 queries and 3 users.\n\nQuery1\nQuery2 \nQuery3 \nQuery4 \nQuery5\n\nI want to give access of Query1 and Query5 to user1 \nand Query4 and Query2 to user2 and likewise.\nmy default url after somebody logins is url\/explorer\nbased on users permission he should see only those queries but as of now all users can see all queries,\nI tried to search stackoverflow and also other places through google but there is no direct answer. Can someone point me to right resource or help me with doing this.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":233,"Q_Id":45320643,"Users Score":0,"Answer":"It's not possible to do with default implementation. You need to download the source code and customize as per your needs.","Q_Score":1,"Tags":"mysql,django,python-2.7","A_Id":47134025,"CreationDate":"2017-07-26T07:50:00.000","Title":"django sql explorer - user based query access","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"where should I place my wsgi.py?\nDo I have to isolate it from my django project folder?\nShould I move my django project folder outside of my home directory?\nCurrently I copied my django project folder to \/home\/username\/djangosites\/project\/\nand my wsgi.py is in the folder \/home\/username\/djangosites\/project\/project\/\nIn the same folder there are files like settings.py urls.py ...\nFrom the modwsgi documentation:\n\n\"Note that it is highly recommended that the WSGI application script\n  file in this case NOT be placed within the existing DocumentRoot for\n  your main Apache installation, or the particular site you are setting\n  it up for. This is because if that directory is otherwise being used\n  as a source of static files, the source code for your application\n  might be able to be downloaded.\nYou also should not use the home directory of a user account, as to do\n  that would mean allowing Apache to serve up any files in that account.\n  In this case any misconfiguration of Apache could end up exposing your\n  whole account for downloading.\nIt is thus recommended that a special directory be setup distinct from\n  other directories and that the only thing in that directory be the\n  WSGI application script file, and if necessary any support files it\n  requires.\"","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":302,"Q_Id":45333099,"Users Score":1,"Answer":"Let wsgi.py but don't make DocumentRoot anything like \/home\/username\/djangosites\/project\/ which would expose your Python scripts source code, which would definitely be very helpful to malicious users.\nAll you need to expose is STATIC_ROOT (on STATIC_URL) and MEDIA_ROOT (on MEDIA_URL), you can use the Alias directive for that. Another solution is to use dj-static.","Q_Score":0,"Tags":"python,django,apache,mod-wsgi","A_Id":45333265,"CreationDate":"2017-07-26T16:53:00.000","Title":"Do I have to isolate my wsgi.py from my django project folder?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am fairly new to Python, but i was wondering if i could utilize Python and its modules. To retrieve a href from page 1, and then the first paragraph in page 2.\nQ2: Also, how could I scrape the first 10 link hrefs with the same div class on page one, and then scrape the first 10 paragraphs, while looping?","AnswerCount":3,"Available Count":1,"Score":0.0665680765,"is_accepted":false,"ViewCount":460,"Q_Id":45373514,"Users Score":1,"Answer":"Yes, I believe you should be able to.\nTry to lookup the requests and beautifulsoup python modules.","Q_Score":0,"Tags":"python,html,screen-scraping","A_Id":45373618,"CreationDate":"2017-07-28T12:26:00.000","Title":"Can Python get a Href link on page one, and then get a paragraph from page 2?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"When we work with Django in local environment, we change the structure of the Data Base using Command Prompt through migration. \nBut for using Django in server, i don't now how can i apply such changes? How can i type commands to change Data Base structure? Is it a good way to upload site files every time that i do some change again.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":196,"Q_Id":45385751,"Users Score":1,"Answer":"The whole point of migrations is that you run them on both your local database and in production, to keep them in sync.","Q_Score":1,"Tags":"python,django,database,django-models","A_Id":45386569,"CreationDate":"2017-07-29T05:45:00.000","Title":"Changing database structure of Django in server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have my django application on ec2 instance. I am able run it on ec2 instance on localhost:8000. When I try to access that django application from outside of that ec2 instance, it doesn't show me \"this site can't be reached\". It is pinging","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":692,"Q_Id":45396835,"Users Score":0,"Answer":"try to do telnet on that server on port 8000 and see if it works.\ndid u open port 8000 from security groups or not ! Most probably it is this issue.","Q_Score":0,"Tags":"python,django,amazon-web-services,amazon-ec2","A_Id":45396854,"CreationDate":"2017-07-30T05:57:00.000","Title":"Amazon EC2 instance pinging but django server is not accessible from outside","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a template where I have a dropdown. I would like to display some data based on the dropdown value selected. The data is fetched from the DB.\nAs I have no idea about ajax or jquery, I need help here to dynamically display the content based on the dropdown selected.\nExample: Say my dropdown is [1,2,3,4]. When user selected 1, it should display ONE in my HTML, if user selected 2 then it should display TWO and so on.\nCan some please share me the HTML code for the above example (with ajax or jquery)?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":408,"Q_Id":45399044,"Users Score":0,"Answer":"Using JQuery: \n\nPass whole options as key value pair, ex: {key : {key:val, ...}, ...} \nUse JQuery to show and hide equivalent sub options when an\noption is clicked.\n\nUsing AJAX:\n\nWhen an option clicked, send an AJAX request to the server.\nFetch its sub options and show in the browser using JQuery.","Q_Score":0,"Tags":"jquery,python,html,ajax,django","A_Id":45399435,"CreationDate":"2017-07-30T10:53:00.000","Title":"Django - Dynamically get the appropriate data based on the dropdown selection","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a project that :\n\nfetches data from active directory\nfetches data from different services based on active directory data\naggregates data \nabout 50000 row have to be added to database in every 15 min \n\nI'm using Postgresql as database and django as ORM tool. But I'm not sure that django is the right tools for such projects. I have to drop and add 50000 rows data and I'm worry about performance.\nIs there another way to do such process?","AnswerCount":3,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":81,"Q_Id":45404241,"Users Score":0,"Answer":"For sure there are other ways, if that's what you're asking. But Django ORM is quite flexible overall, and if you write your queries carefully there will be no significant overhead. 50000 rows in 15 minutes is not really big enough. I am using Django ORM with PostgreSQL to process millions of records a day.","Q_Score":0,"Tags":"django,python-2.7,postgresql,orm","A_Id":45404605,"CreationDate":"2017-07-30T20:12:00.000","Title":"Collecting Relational Data and Adding to a Database Periodically with Python","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I can get html of a web site using lxml module if authentication is not required. However, when it required, how do I input 'User Name' and 'Password' using python?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":29,"Q_Id":45406471,"Users Score":0,"Answer":"It very much depends on the method of authentication used. If it's HTTP Basic Auth, then you should be able to pass those headers along with the request. If it's using a web page-based login, you'll need to automate that request and pass back the cookies or whatever session token is used with the next request.","Q_Score":0,"Tags":"python,authentication,login,web-crawler,lxml","A_Id":45406522,"CreationDate":"2017-07-31T01:51:00.000","Title":"How to get html using python when the site requires authenticasion?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using scrapy-redis now, and I am ok with it, and I am success to crawl in different computer by using the same redis server.\nBut I don't understand how to use the scrapy-redis pipeline properly.\nIn my understanding, I think I need another script than the spiders to deal with the item in the redis pipeline list, then I can do stuffs like store them into the database.\nDo I understand right, do I have to write another script, which is somehow dependent from the spider?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":489,"Q_Id":45410078,"Users Score":0,"Answer":"The pipeline is a different script, yes. In the settings file you can enable the pipeline. A pipeline can be used to store the crawled results in any database you want.","Q_Score":0,"Tags":"python,redis,scrapy","A_Id":45420788,"CreationDate":"2017-07-31T07:44:00.000","Title":"how to use scrapy-redis pipeline?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How long does it take to deploy Python Django applications to AWS-Beanstalk (for a simple social-platform) normally? Developers are giving me estimations 90 to 100 hours of work. It feels like a bit rip off.\nAre there responsible, experienced professionals here set up the deployment?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":46,"Q_Id":45411084,"Users Score":0,"Answer":"The first time I deployed a Django app to aws eb it took me about ten to twelve hours of work.\nAWS eb is not the easiest to work with because of the lack of good documentation.\nStill if you understand what's going on it's not that bad.","Q_Score":1,"Tags":"python,django,amazon-web-services,amazon-elastic-beanstalk","A_Id":45495283,"CreationDate":"2017-07-31T08:41:00.000","Title":"deployment Python Django applications to AWS Beanstalk","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"With python social auth, when a user is logged in when he clicks 'Login with Facebook' or similar.  \nThe request.user is not the newly logged in facebook user but the old logged in user. \n\nlog in with email test1@gmail.com\nlog in with facebook email test-facebook@gmail.com\n\nLogged in user (request.user) is still test1@gmail.com\nIs this intended behavior? \nIs there a way to fix this or should I not present log-in unless he's not logged out?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":49,"Q_Id":45412902,"Users Score":0,"Answer":"If there's a user already logged in in your app, then python-social-auth will associate the social account with that user, if it should be another user, then the first must be logged out. Basically python-social-auth will create new users if there's none logged in at the moment, otherwise it will associate the the social account.","Q_Score":0,"Tags":"django,python-social-auth","A_Id":45424674,"CreationDate":"2017-07-31T10:05:00.000","Title":"python social auth, log in without logging out","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"PEP 8 says \"Modules should have short, all-lowercase names. Underscores can be used in the module name if it improves readability. Python packages should also have short, all-lowercase names, although the use of underscores is discouraged.\"  \nI am working on an educational program which could, ultimately, have many lessons. Sometimes one app could deliver thousands of lessons (i.e. spelling), but still, there could be many apps. Underscores in lower case names for readability seems essential.\nWhen I use an underscore in an app name,  such as clockwise_counter, \"python manage.py startapp clockwise_counter\" removes the underscore in constructing the class name in apps.py. The class name becomes \n\"class ClockwiseCounterConfig(AppConfig):\n    name = 'clockwise_counter'\"\nThis caused me a lot of confusion until I learned to copy the apps.py class name into the INSTALLED_APPS section of settings.py by removing the underscore.\nMy Questions are:\n\nWhy are the underscores discouraged in PEP 8?  Is there really a good reason or was it just personal preference sometime in the past.\nAm I likely to have problems using underscores in app names for readability now or in the future?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":399,"Q_Id":45440820,"Users Score":0,"Answer":"That's a standard behaviour and NOT a bug. The underscore in module or package names is legal, you are thus you may put underscores in these names.\nIn another hand having a Clockwise_Counter_Config class is somehow ugly (but it works).\nAh, and the INSTALLED_APPS settings is a list (or sequence) of apps package dotted names, and not of class names.","Q_Score":1,"Tags":"python,django,naming-conventions","A_Id":45441741,"CreationDate":"2017-08-01T14:37:00.000","Title":"Django app.py removes underscore in Config","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I just recently started using Komodo Edit 10 and used an existing Django project which uses Python 3.6.x. I created a Komodo project (.komodoproject file) for it and updated the Projects > Project Preferences > Languages > Python 3 > Use this interpreter to point to my conda virtual environment. I've also added the site-packages directory to the \"Additional Python 3 Import Directories\" and so I was expecting code completion to work.\nNow, when I open a .py file, like models.py, and start typing from dj, no code completion is done (I was expecting to get django drop-down). Then I noticed that in the open file, there's a drop-down to change the file type of the file (upper-right corner of editor). I changed it to \"Python 3\" and now completion works (yey!). So then I proceed to open the views.py file expecting code completion to work but it wouldn't, and I had to set the file type to \"Python 3\" before it worked.\nNow, my question is if there's a way to batch change the file type for all .py files inside the project from \"Python 2\" to \"Python 3\"? Or do I have to tediously change the file type for each .py file manually?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":197,"Q_Id":45478974,"Users Score":1,"Answer":"You just need to update the file association under Preferences > File Associations.","Q_Score":0,"Tags":"python-3.x,komodo,komodoedit","A_Id":45487880,"CreationDate":"2017-08-03T08:35:00.000","Title":"How to set all .py files in Komodo Edit project to be recognized as Python 3 instead of Python 2?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Django with Django-Rest-Framework. If I run the serializer.is_valid() function I get a False result. How can I show the reason for this result?","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":312,"Q_Id":45482486,"Users Score":2,"Answer":"serializer.errors has the details of the validation errors that occured","Q_Score":5,"Tags":"python,django,django-rest-framework","A_Id":45482515,"CreationDate":"2017-08-03T11:09:00.000","Title":"How to show mistakes with Django Serializer Validation?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm currently developping a micro_blog to learn Django, and i didn't find the way to make a page only visible by one User.\nex: i want that each user got a private page on \/profile\/username\/private .\nHow sould i do to make that only the user \"username\" got access to it?\nFor the moment, every-user can access to this page by typing the url.\nI already put the \" @login_required \" on head of my func, but logged user can still access to the page.\nHope that you'll understand my issue,\nKind Regards,\n[UPDATE]\nI successfully made it by comparing the name of the current connected user with the name of the owner private page. As each username is unique in the DataBase, the way i did it works.","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":965,"Q_Id":45484521,"Users Score":2,"Answer":"Create your own decorator that will validate the logged in user before going into the view and show the content accordingly. Put a check in the template that the logged in user is requesting the page. You can use both @login_required and your own decorator on your view.","Q_Score":1,"Tags":"python,django,django-views","A_Id":45485423,"CreationDate":"2017-08-03T12:41:00.000","Title":"Django - Make private page by user","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using django 1.10 and python 3.6.1\nwhen executing \nget_or_none(models.Character, pk=0), with SQL's get method, the query returns a hashmap i.e.: <Character: example>\nHow can I extract the value example?\nI tried .values(), I tried iterating, I tried .Character\nnothing seems to work, and I can't find a solution in the documentation.\nThank you,","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":414,"Q_Id":45500972,"Users Score":0,"Answer":"@Daniel Roseman helped me understand the answer.\nSOLVED:\nWhat I was getting from the query was the model of character, so I couldn't have accessed it thru result.Character but thru result.Field_Inside_Of_Character","Q_Score":0,"Tags":"python,mysql,sql,django","A_Id":45501557,"CreationDate":"2017-08-04T07:43:00.000","Title":"Django SQL get query returns a  hashmap, how to access the value?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In my Django application, I call an external API, which returns XML. I would like to display this \"minified\" response as an indented multiline string on the page (a plus would be syntax highlighting). I tried to process the string in Python with toprettyxml() from xml.dom.minidom, and a few things with ElementTree, but it does not play along the Jinja2 rendering well (line breaks disappear and I only get a one line string, displayed inside <pre> tags).\nWhat's the recommended way to display such code excerpt?\nShould I use client-side rendering? Then, which library should I use?\nDjango version: 1.11.2\nPython 3.6.1","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":425,"Q_Id":45504829,"Users Score":0,"Answer":"This isn't anything to do with Python or Jinja2, but just down to how browsers render text within HTML.\nIf you want to preserve spacing and indentation, you need to wrap your content with <pre>...<\/pre> tags.","Q_Score":0,"Tags":"python,xml,django,jinja2","A_Id":45504945,"CreationDate":"2017-08-04T10:45:00.000","Title":"How to display indented xml inside a django webpage?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Basically I have a program which scraps some data from a  website, I need to either print it out to a django template or to REST API without using a database. How do I do this without a database?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":264,"Q_Id":45510970,"Users Score":0,"Answer":"Your best bet is to \na.) Perform the scraping in views themselves, and pass the info in a context dict to the template \nor\nb.) Write to a file and have your view pull info from the file.","Q_Score":0,"Tags":"python,django,rest,api","A_Id":45511102,"CreationDate":"2017-08-04T15:51:00.000","Title":"Transfering data to REST API without a database django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am not talking about the softwares like surf online, HTtrack, or any other 'save page' feature of browsers but I need to know how actually it happens in the background. I am interested in making my own program to do that.\nAlso is it possible to do in JavaScript. If yes what are the libraries I should look into or any other APIs that could be helpful. Please give me any kind of information about the topic I couldn't find any relevant thing to contribute my research.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":188,"Q_Id":45517437,"Users Score":0,"Answer":"Download entire HTML content of the web page \nFor JS files, look for the <script> tags and download the js file using the src attribute or any inline scripts inside the tag\nFor CSS, use <link> tag to download the CSS file and also look for any <style> tags for inline CSS styling\nFor Images, scan for <img> tag and download the image using src attribute\n\nSame approach can be used for audio\/video etc","Q_Score":1,"Tags":"javascript,php,python,angularjs,web","A_Id":45517697,"CreationDate":"2017-08-05T01:40:00.000","Title":"How to get all files like: js,css,images from a website to save it for offline use?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How to calculate expiry date in odoo 10 and how to notify to customers from email\/sms before 10 days?\nfor example:- \nIf expiry date is near, the customer gets notification through mail or sms.\nCan anyone suggest any solution?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":325,"Q_Id":45518829,"Users Score":1,"Answer":"You need to create a scheduler it should run everyday. It should calculate the expiry dates which are ending in next 10 days. For those records you have to trigger the mail.\n\nCreate a scheduler\nFind the expiry dates\nCreate email template\nTrigger Email\n\nPlease refer sale subscription it has subscription expiry reminder","Q_Score":0,"Tags":"python-2.7,odoo-10","A_Id":45519483,"CreationDate":"2017-08-05T06:05:00.000","Title":"expiry date in odoo 10","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"There's a lot of info out there and honestly it's a bit too much to digest and I'm a bit lost. \nMy web app has to do so some very resource intensive tasks. Standard setup right now app on server static \/ media on another for hosting. What I would like to do is setup celery so I can call task.delay for these resource intensive tasks.\n\nI'd like to dedicate the resources of entire separate servers to these resource intensive tasks.\n\nHere's the question: How do I setup celery in this way so that from my main server (where the app is hosted) the calls for .delay are sent from the apps to these servers? \nNote: These functions will be kicking data back to the database \/ affecting models so data integrity is important here. So, how does the data (assuming the above is possible...) retrieved get sent back to the database from the seperate servers while preserving integrity?\n\nIs this possible and if so wth do I begin - information overload? \nIf not what should I be doing \/ what am I doing wrong?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":790,"Q_Id":45519810,"Users Score":1,"Answer":"The whole point of Celery is to work in exactly this way, ie as a distributed task server. You can spin up workers on as many machines as you like, and the broker - ie rabbitmq - will distribute them as necessary.\nI'm not sure what you're asking about data integrity, though. Data doesn't get \"sent back\" to the database; the workers connect directly to the database in exactly the same way as the rest of your Django code.","Q_Score":0,"Tags":"python,django,database,celery,scheduled-tasks","A_Id":45519970,"CreationDate":"2017-08-05T08:19:00.000","Title":"Django talking to multiple servers","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to make a real time game, I wanted to use NodeJS-SocketIO or aiohttp, Until I met django-channels, then i read its documentation.\nThis is a good module\nQuestions:\n\nIs django-channels suitable for real time game?\nDoes django-channels have an advantage over aiohttp\/nodejs-socketio?\nIs it suitable for all client (android, IOS, desktop)?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2897,"Q_Id":45521079,"Users Score":12,"Answer":"To begin with, channels is nothing but an asynchronous task queue. It's very similar to celery, the major difference being in performance & reliability.\nChannels is faster than celery but celery is more reliable. To add more context to it, channels executes a task only once (irrespective of whether it fails or succeeds). On the other hand, celery executes the tasks until the tasks fail a certain number of time or it succeeds. \nNow, coming to your questions & taking this example.\n\nSuppose you were to build clash of clans using channels &\n  web-sockets.\n\n1) Yes, channels is suitable for real time game as long as you write custom logic for the situations where the task in the async queue fails. \nThe web-sockets will send & receive messages via channels. So, in case where one of the players' request to deploy a troop on the battlefield is not successfully sent to the server, you need to write custom logic to handle this situation (like trying a request at least 3 times before dumping it out of the task queue).\n2) Not really. They are pretty much the same. Ultimately you'll have to use web-sockets & a queue where you can fire\/receive messages simultaneously. \n3) Yes, you'll have to implement a web-socket in your application (android, iOS, desktop) which'll send\/receive messages from the backend via channels.","Q_Score":11,"Tags":"python,django,django-channels","A_Id":48280901,"CreationDate":"2017-08-05T10:53:00.000","Title":"Is django-channels suitable for real time game?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I Have the following folder setup:\n\nmyproject\nweb\nworker\n\nThe web project is a website containing the typical django setup and all, including the model and some service classes which move the logic away from the views. The website will display data coming from a database. The worker folder contains 2 classes which are filling the database and aggregate it. These 2 classes are like background processes. My question is, how should I structure this? \n\nShould each worker class get his own application folder\nIf so, I would prefer to move the models out of the web project in the myproject folder, since they are shared between the applications. However this seems to be against the django convention, why so? And how would the convention handle this?\nIf not, where should I put these worker processes? And how should I run them ?\n\nThanks in advance!","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":644,"Q_Id":45525759,"Users Score":0,"Answer":"Usually if I have stuff to be shared between different sections I either:\n1) make a lib and install it via pip\n2) make a helper folder within the project","Q_Score":1,"Tags":"python,django,conventions","A_Id":45525793,"CreationDate":"2017-08-05T19:40:00.000","Title":"Django where to put the shared models and logic","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have two database in mysql that have tables built from another program I have wrote to get data, etc. However I would like to use django and having trouble understanding the model\/view after going through the tutorial and countless hours of googling. My problem is I just want to access the data and displaying the data. I tried to create routers and done inspectdb to create models. Only to get 1146 (table doesn't exist issues). I have a unique key.. Lets say (a, b) and have 6 other columns in the table. I just need to access those 6 columns row by row. I'm getting so many issues. If you need more details please let me know. Thank you.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":104,"Q_Id":45529142,"Users Score":0,"Answer":"inspectdb is far from being perfect. If you have an existing db with a bit of complexity you will end up probably changing a lot of code generated by this command. One you're done btw it should work fine. What's your exact issue? If you run inspectdb and it creates a model of your table you should be able to import it and use it like a normal model, can you share more details or errors you are getting while querying the table you're interested in?","Q_Score":0,"Tags":"python,mysql,django","A_Id":45529591,"CreationDate":"2017-08-06T06:14:00.000","Title":"Django and Premade mysql databases","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to create a table in a browser that's been created with python. That part can be done by using DataTable of the bokeh library. The problem is that I want to extract data from the table when a user gives his\/her input in the table itself. \nAny library of python I could use to do this? It would better if I could do this with bokeh though.","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1099,"Q_Id":45540638,"Users Score":0,"Answer":"If your requirement is to create an application using Python and users will access via browser and update some data into a table?\nUse Django or any web framework, basically, you are trying to build a web app!!\nor\nif you are looking for something else do mention your requirement thoroughly.","Q_Score":1,"Tags":"python,html,bokeh","A_Id":45540958,"CreationDate":"2017-08-07T06:31:00.000","Title":"Extract user input to python from a table created in browser?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a custom module with a model installed, i want to update the module as i have made change in design of the module. Is there anyway to update the model structure like removing or deleting field in the model in ODOO v10.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1414,"Q_Id":45543511,"Users Score":0,"Answer":"I had a little experience with odoo 8, as I know once you add a field to a model you can't simply remove it, because it passes throught the ORM to the SGBD, so if you remove it from the model it will remain in the table of the database. maybe you can try to remove the table from the data base and re execute your code (I used to do that on a test database I DON'T recommend to do so on a database with real data). If it doesn't work, I think you should create a new database, and install your module after you make your changes on the model.","Q_Score":1,"Tags":"python,openerp,odoo-10","A_Id":45543831,"CreationDate":"2017-08-07T09:24:00.000","Title":"How to update Odoo Custom Module's Model","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have two applications in Django (one for admin and one for regular users). I want to allow the admin user to login in admin panel and also login in the home page as a regular user (two different users with different credentials).\nI know that the session is saved as a cookie, so my best guess is that I have to use a different SESSION_COOKIE_NAME in each app, but I don't know if this is the best approach.\nHow can I set different login sessions for each app?.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":634,"Q_Id":45574177,"Users Score":1,"Answer":"I solved it this way (assumed on Unix based OS):\n\nfirst create new value in \/etc\/hosts:\n  127.0.0.1 {your local testdomain}\nadd {your local testdomain} to ALLOWED_HOSTS in settings.py\nOpen your application e.g. on {your local testdomain}:8000\nOpen admin interface on localhost:8000\/admin\n\nBecause of the cookie policy the session data is stored per domain.","Q_Score":1,"Tags":"python,django,session-cookies,django-settings,django-sessions","A_Id":52615621,"CreationDate":"2017-08-08T17:04:00.000","Title":"Django: Two types of users logged in at same time","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm currently working on a project that involves parsing through a user-supplied file, doing computations with that data, and visualizing the results using graphing utilities. Right now, I'm stuck with using Python as the back-end because it has scientific libraries unavailable in JavaScript, but I want to move the entire tool to a web server, where I can do much slicker visualizations using D3.js.\nThe workflow would be something like: obtain the file contents from the browser, execute the Python script with the contents, return jsonified objects of computed values, and plot those objects using D3. I already have the back-end and front-end working by themselves, but want to know: How can I go about bridging the two? From what I've gathered, I need to do something along the lines of launching a server, sending AJAX requests to the server, and retrieving data from the server. But with the number of frameworks out there (Flask, cgi, apache, websockets, etc.), I'm not really sure where to start. This will likely only be a very simple web app with just a file submit page and a data visualization page. Any help is appreciated!","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":27397,"Q_Id":45578060,"Users Score":11,"Answer":"Apache is a web server, flask is a web framework in python, websockets are a protocol, and cgi is something totally different, and none of them help you on the front end.\nYou could deploy a simple backend in flask or django or pylons or any other python web framework. I like django, but it may be a little heavy for your purpose, flask is a bit more lightweight.  You deploy them to a server with a web server installed and use something like apache to distribute.  \nThen you need a front end and a way of delivering your front end.  Flask \/ Django are both fully capable of doing so in conjunction with a web server, or you could use a static file server like Amazon S3.  \nOn your front end, you need to load D3 and probably some kind of utility like jQuery to load and parse your data from the back end, then use D3 however you like to present it on screen.","Q_Score":11,"Tags":"javascript,python","A_Id":45578326,"CreationDate":"2017-08-08T21:08:00.000","Title":"Bridging a Python back-end and JavaScript front-end","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm currently working on a project that involves parsing through a user-supplied file, doing computations with that data, and visualizing the results using graphing utilities. Right now, I'm stuck with using Python as the back-end because it has scientific libraries unavailable in JavaScript, but I want to move the entire tool to a web server, where I can do much slicker visualizations using D3.js.\nThe workflow would be something like: obtain the file contents from the browser, execute the Python script with the contents, return jsonified objects of computed values, and plot those objects using D3. I already have the back-end and front-end working by themselves, but want to know: How can I go about bridging the two? From what I've gathered, I need to do something along the lines of launching a server, sending AJAX requests to the server, and retrieving data from the server. But with the number of frameworks out there (Flask, cgi, apache, websockets, etc.), I'm not really sure where to start. This will likely only be a very simple web app with just a file submit page and a data visualization page. Any help is appreciated!","AnswerCount":2,"Available Count":2,"Score":1.0,"is_accepted":false,"ViewCount":27397,"Q_Id":45578060,"Users Score":7,"Answer":"Flask is easy to get up and running and is Python based.  It works well with REST APIs and data sent by JSON (or JSON API).\nThis is one solution with which I have some experience and which seems to work well and is not hard to get up and running (and natural to work with Python).  I can't tell you whether it is the best solution for your needs, but it should work.\nIf you are overwhelmed and don't know where to start, you can pick one of the options and google search for a tutorial.  With a decent tutorial, you should have an example up and running by the end of the tutorial, and then you will know if you are comfortable working with it and have an idea whether it will meet your needs.\nThen you could do a proof-of-concept; make a small app that just handles one small part (the one you are most concerned about handling, perhaps) and write something which will do it.\nBy then, you can be pretty sure you have a good tool for the purpose (unless you were convinced otherwise by the proof-of-concept -- in which case, try again with another option :-))","Q_Score":11,"Tags":"javascript,python","A_Id":45578190,"CreationDate":"2017-08-08T21:08:00.000","Title":"Bridging a Python back-end and JavaScript front-end","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"This is an obvious question for everyone, but I don't understand what the term \"clean\" means. I can use clean_data, and use form validation on my forms. However, I still don't understand what this means. \nIn order to use validation, do I always need to use the keyword \"clean\"?","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":3453,"Q_Id":45580435,"Users Score":2,"Answer":"As far as i have understood ..all the implicit validations are performed using clean..\nwhich is performed when we check for the form validity using is_valid:\nbut we can add our own validations to it by overriding the function clean():\nwhat we have to do is we call the super().clean() such that all the implicit validations are done by the clean() defined by django and then add our own validations to it if necessary...\nwhen you call the super().clean() it returns the dictionary containing the cleaned_data..\nyou can store it in a variable ...\nor else you can access the dictionary using self.cleaned_data","Q_Score":0,"Tags":"python,django,django-forms","A_Id":52530445,"CreationDate":"2017-08-09T01:44:00.000","Title":"What does clean mean in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm having a bit of trouble with Pycharm. I tried opening a project with it, one that I know has files and folders in it, but for some reason, the project view and the editor is not visible at all. I checked one of the modules, and there is code in it, so I don't know why I can't get these things to show properly.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":1576,"Q_Id":45593421,"Users Score":1,"Answer":"So apparently all I needed to do was close Pycharm and start it up again.","Q_Score":0,"Tags":"python,django,pycharm","A_Id":45594147,"CreationDate":"2017-08-09T14:23:00.000","Title":"Pycharm is not showing the project view or editor of a project","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Im trying to compare the page source with Robot Framework. I added the robotframework-difflibrary for extra compare, however I can not send a wildcard for check. \nIn my page source there is always the date and time which will never be the same. So my result will always be false because the date \/ time part is different.\nIs it possible to let Robot Framework to ignore some parts of the HTML?\nExample of time \/ date HTML tag:\ntd class=\"r\">12:43:01\ntd class=\"r\" width=\"10%\">8-8-2017","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":433,"Q_Id":45594748,"Users Score":1,"Answer":"There is no way to cause that keyword to ignore parts of the HTML. You will  have to write your own keyword, or modify the html before doing the compare.","Q_Score":0,"Tags":"python-2.7,robotframework","A_Id":45595174,"CreationDate":"2017-08-09T15:22:00.000","Title":"File compare incl wildcards for variables with Robot Framework","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Imagine that I've written a celery task, and put the code to the server, however, when I want to send the task to the server, I need to reuse the code written before.\nSo my question is that are there any methods to seperate the code between server and client.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":222,"Q_Id":45608490,"Users Score":0,"Answer":"Try a web server like flask that forwards requests to the celery workers. Or try a server that reads from a queue (SQS, AMQP,...) and does the same.\nNo matter the solution you choose, you end up with 2 services: the celery worker itself and the \"server\" that calls the celery tasks. They both share the same code but are launched with different command lines.\nAlternately, if the task code is small enough, you could just import the git repository in your code and call it from there","Q_Score":1,"Tags":"python,celery","A_Id":45608632,"CreationDate":"2017-08-10T08:36:00.000","Title":"how to seperate celery code into server and client side?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have deployed a django app on heroku. So far it works fine. Now I have to schedule a task (its in the form of python script) once a day. The job would take the data from heroku database perform some calculations and post the results back in the database. I have looked at some solutions for this usually they are using rails in heroku. I am confused whether I should do it using the cron jobs extension available in django or using the scheduled jobs option in heroku. Since the application is using using heroku I thought of using that only but I dont get any help how to add python jobs in it. Kindly help.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":397,"Q_Id":45612349,"Users Score":1,"Answer":"I suggest you to create a Django management command for your project like python mananage.py run_this_once_a_day. And you can use Heroku schedular to trigger this scheduling.","Q_Score":0,"Tags":"python,django,heroku","A_Id":45612723,"CreationDate":"2017-08-10T11:22:00.000","Title":"running scheduled job in django app deployed on heroku","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Python Scraper that I run periodically in my free tier AWS EC2 instance using Cron that outputs a csv file every day containing around 4-5000 rows with 8 columns. I have been ssh-ing into it from my home Ubuntu OS and adding the new data to a SQLite database which I can then use to extract the data I want.\nNow I would like to try the free tier AWS MySQL database so I can have the database in the Cloud and pull data from it from my terminal on my home PC. I have searched around and found no direct tutorial on how this could be done. It would be great if anyone that has done this could give me a conceptual idea of the steps I would need to take. Ideally I would like to automate the updating of the database as soon as my EC2 instance updates with a new csv table. I can do all the de-duping once the table is in the aws MySQL database.\nAny advice or link to tutorials on this most welcome. As I stated, I have searched quite a bit for guides but haven't found anything on this. Perhaps the concept is completely wrong and there is an entirely different way of doing it that I am not seeing?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":158,"Q_Id":45630562,"Users Score":1,"Answer":"The problem is you don't have access to RDS filesystem, therefore cannot upload csv there (and import too).\nModify your Python Scraper to connect to DB directly and insert data there.","Q_Score":0,"Tags":"python,mysql,database,database-design,amazon-ec2","A_Id":45643778,"CreationDate":"2017-08-11T08:36:00.000","Title":"Exported scraped .csv file from AWS EC2 to AWS MYSQL database","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is there a OneToManyField relationship in Django? There is a ManyToOneField relationship but that restrict you declare the relationship on the Many side.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":503,"Q_Id":45633267,"Users Score":3,"Answer":"You should recognise that Django fields represent database columns. A ForeignKey field is exactly that, a field on the model that represents a key in another model. But you can't model a \"one-to-many\" field in that way; what would the field on the model represent? So no, it is not possible.","Q_Score":1,"Tags":"python,django,django-models","A_Id":45633856,"CreationDate":"2017-08-11T10:43:00.000","Title":"OneToManyField relationship in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to Oozie. I have couple of questions on oozie job scheduling.\n\nCan we get a list of jobs which scheduled on ozzie server for everyday run using some programmatic approach? Considering there are multiple job scheduled to run everyday may be for next couple of months or year.\nHow to know programmatically that a scheduled job had failed to run at day end for reporting purpose?\nCan we do a ranking on oozie scheduled job on the basis of their execution time?\n\nThanks much for any help on this.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":170,"Q_Id":45633650,"Users Score":0,"Answer":"You can use the Cloudera Hue or Apache Ambari tools that will give you your all info about the Ozzie \nIf you are looking for more you can write you own program using some api expose by oozie.","Q_Score":0,"Tags":"python,hadoop,oozie,oozie-workflow","A_Id":45682834,"CreationDate":"2017-08-11T11:03:00.000","Title":"Apache Oozie workflows","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"So I am working on a project that has a Raspberry Pi connected to a Serial Device via a USB to Serial Connector.  I am trying to use PySerial to track the data being sent over the connected Serial device, however there is a problem.\nCurrently, I have my project set up so that every 5 seconds it calls a custom port.open() method I have created, which returns True if the port is actually open.  This is so that I don't have to have the Serial Device plugged in when I initially go to start the program.\nHowever I'd also like to set it up so that the program can also detect when my serial device is disconnected, and then reconnected.  But I am not sure how to accomplish this.\nIf I attempt to use the PySerial method isOpen() to check if the device is there, I am always having it return true as long as the USB to Serial connector is plugged in, even if I have no Serial device hooked up to the connector itself.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1786,"Q_Id":45634854,"Users Score":0,"Answer":"You might be able to tell whether the device is physically plugged in by checking the status of one of the RS232 control lines - CTS, DSR, RI, or CD (all of which are exposed as properties in PySerial).  Not all USB-serial adapters support any of these.\nIf the only connection to the device is the TX\/RX lines, your choices are extremely limited:\n\nSend a command to the device and see if it responds.  Hopefully its protocol includes a do-nothing command for this purpose.\nIf the device sends data periodically without needing an explicit command, save a timestamp whenever data is received, and return False if it's been significantly longer than the period since the last reception.","Q_Score":0,"Tags":"python,raspberry-pi,pyserial","A_Id":45635399,"CreationDate":"2017-08-11T12:07:00.000","Title":"PySerial, check if Serial is Connected","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to use django-tables2 in my django project but I keep getting \n\n\"ModuleNotFoundError: No module named 'django-tables2'\" error.\n\ninstalled it with pip install - everything OK.\nadded django-tables2 to INSTALLED_APPS (it seems the problem is here).\nThanks you.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1651,"Q_Id":45635746,"Users Score":4,"Answer":"You're using a hyphen but the module name has an underscore. The instructions ask you to add \"django_tables2\" to INSTALLED_APPS and not \"django-tables2\".","Q_Score":1,"Tags":"python,django,django-tables2","A_Id":45635938,"CreationDate":"2017-08-11T12:53:00.000","Title":"django-tables2 module missing","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"While running odoo at the first time it shows ImportError: No module named openerp\n\nC:\\Python27\\python.exe E:\/workspaces\/odoo-10.0-20170812\/odoo.py -c\nE:\\workspaces\\odoo-10.0-20170812\\odoo.conf Traceback (most recent call\n  last):   \nFile \"E:\/workspaces\/odoo-10.0-20170812\/odoo.py\", line 160, in\n  \n      main()\n  File \"E:\/workspaces\/odoo-10.0-20170812\/odoo.py\", line 156, in main\nimport openerp\nImportError: No module named openerp\nProcess finished with exit code 1","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":2238,"Q_Id":45678932,"Users Score":1,"Answer":"Odoo 10 source code does not contain the .\/odoo.py file, it is probably from <=9.0, where the now odoo module was named openerp. You should've got the wrong source, or mixed up the two.","Q_Score":2,"Tags":"python,django,openerp","A_Id":45716439,"CreationDate":"2017-08-14T16:26:00.000","Title":"ImportError: No module named openerp","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"While running odoo at the first time it shows ImportError: No module named openerp\n\nC:\\Python27\\python.exe E:\/workspaces\/odoo-10.0-20170812\/odoo.py -c\nE:\\workspaces\\odoo-10.0-20170812\\odoo.conf Traceback (most recent call\n  last):   \nFile \"E:\/workspaces\/odoo-10.0-20170812\/odoo.py\", line 160, in\n  \n      main()\n  File \"E:\/workspaces\/odoo-10.0-20170812\/odoo.py\", line 156, in main\nimport openerp\nImportError: No module named openerp\nProcess finished with exit code 1","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":2238,"Q_Id":45678932,"Users Score":4,"Answer":"import openerp won't work in Odoo 10 because openerp is replaced with odoo. Upto version 9 it was openerp but in 10 it changed.\nSo try:\nimport odoo instead of import openerp.\nOdoo 10 source code does not contain an import openerp anywhere, maybe you have downloaded from the wrong source.","Q_Score":2,"Tags":"python,django,openerp","A_Id":45686661,"CreationDate":"2017-08-14T16:26:00.000","Title":"ImportError: No module named openerp","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm building a Pyramid application, but I would like to have a light-weight REST API built in to it. I've built such an API already with Flask, so is it possible to build my application in both Flask and Pyramid simultaneously?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":37,"Q_Id":45699832,"Users Score":0,"Answer":"Yes; they are both WSGI apps. Just configure a router container to hold them, and map URL prefixes to one or the other. How you do this depends on your WSGI server (some have native support).\nAlternatively, have Flask host the Pyramid WSGI app; any Flask route that returns an object that is not a string or a Response object, will be treated as a WSGI app and have the correct data passed in.","Q_Score":1,"Tags":"python","A_Id":45699897,"CreationDate":"2017-08-15T19:09:00.000","Title":"Is it possible to incorporate Flask with Pyramid?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have been working through the initial tutorial and ran into a load of issues with my anaconda install using python 2.7. In the end it wouldn't launch the server.\nAnyway, I decided to change up on my machine to python3. That said, I am now getting strange results which are:\nIf I use the terminal command $python -m django --version I get the following:\n\"..\/Contents\/MacOS\/Python: No module named django\"\nIf I change to \"$python3 -m django --version\" terminal gives me back: \"1.11.4\"\nNow, when I am in the tutorial and starting again from the beginning I do the following: \"$django-admin startproject mysite\"\nThis seemed to work.\nHowever, when I tried: \"$python manage.py runserver\" I get the following:\nTraceback (most recent call last):\n  File \"manage.py\", line 17, in \n    \"Couldn't import Django. Are you sure it's installed and \"\nImportError: Couldn't import Django. Are you sure it's installed and available on your PYTHONPATH environment variable? Did you forget to activate a virtual environment?\nIf I change to include 3, so \"$python3 manage.py runserver\" all is well.\nMy question is do I need to always use python3 in every command now? I does not say that in the tutorial.\nMy Mac OSx has a native install of 2.7 which I believe is required by my machine for other apps dependency.\nAny help would be really appreciated! I am sure given I am new to python I am being a complete moron!","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":10200,"Q_Id":45700003,"Users Score":0,"Answer":"Yes. Python 3's binaries are installed with a suffix of \"3\", so python will launch a Python 2 interpreter and you need to run python3 to specifically use Python 3.","Q_Score":2,"Tags":"python,django,python-2.7,python-3.x","A_Id":45700170,"CreationDate":"2017-08-15T19:20:00.000","Title":"\"$python manage.py runserver\" not working. Only \"python3 manage.py runserver\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm trying to create app using the command python3 manage.py startapp webapp but i'm getting an error that says:\n\ndjango.core.exceptions.ImproperlyConfigured: Error loading either\n  pysqlite2 or sqlite3 modules (tried in that order): No module named\n  '_sqlite3'\n\nSo I tried installing sqlite3 using pip install sqlite3 but I got this error:\n\nUsing cached sqlite3-99.0.tar.gz\nComplete output from command python setup.py egg_info:\nTraceback (most recent call last):\nFile \"\", line 1, in \nFile \"\/tmp\/pip-build-dbz_f1ia\/sqlite3\/setup.py\", line 2, in \n          raise RuntimeError(\"Package 'sqlite3' must not be downloaded from pypi\")\nRuntimeError: Package 'sqlite3' must not be downloaded from pypi\nCommand \"python setup.py egg_info\" failed with error code 1 in \/tmp\/pip-build-dbz_f1ia\/sqlite3\/\n\nI tried running this command: sudo apt install sqlite3 but it says sudo is not a valid command, even apt isn't for some reason. I'm running Python3.6.2. I installed Python on my Godaddy hosting and i'm using SSH to install everything. I installed Python and setup a virtualenv. Afterwards, I installed Django and created a Django project. How can I fix these errors to successfully create a Django app?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":5897,"Q_Id":45704177,"Users Score":2,"Answer":"sqlite3 is part of the standard library. You don't have to install it.\nIf it's giving you an error, you probably need to install your distribution's python-dev packages, eg with sudo apt-get install python-dev.","Q_Score":3,"Tags":"python,django,sqlite","A_Id":45706624,"CreationDate":"2017-08-16T02:25:00.000","Title":"Downloading sqlite3 in virtualenv","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I had been building my React Native app for a long time using a global python environment, which I know is bad form, so I decided to create a virtualenv.\nBut now when I activate the virtualenv and run the server, none of my api endpoints are reachable (I'm using django btw). Instead, the network call doesn't return for a very long time and then comes back with the error \"Network Request Failed\". But if I deactivate the virtualenv and go back to global python and run the server, everything works fine.\nI've seen this \"Network Request Failed\" error before during times where I've forgotten to turn the server on, so I know it indicates that the server is unreachable.\nHere's one last weird aspect though. If I activate the virtualenv and turn on the server and then type the url to an endpoint into the browser, it successfully reaches the browsable django api for the endpoint. So it seems to be set up fine except that the app for whatever reason can't communicate with it. Very bizarre.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":75,"Q_Id":45705189,"Users Score":0,"Answer":"Previously when running global python I was doing manage.py runserver 0.0.0.0:8000. Turns out I had to use my actual machine's IP address with the virtual env. Not sure why it works differently in that way, but it does.","Q_Score":0,"Tags":"python,django,react-native,virtualenv,react-native-android","A_Id":45727148,"CreationDate":"2017-08-16T04:34:00.000","Title":"React Native app fails to reach endpoints on python virtualenv, but succeeds with global python env","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working on a online store using Django, the question is simple, for a simple model named Product with \"name\" and \"description\" fields, should I try a full text search using PostgreSQL or a simple query using \"icontains\" field lookup?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":58,"Q_Id":45726834,"Users Score":0,"Answer":"The simplest way to use full text search is to search a single term against a single column in the database.\nexample: Product.objects.filter(description_text__search='lorem')\nSearching against a single field is great but rather limiting. To query against both fields, use a SearchVector\nSame way you can use SearchQuery too.","Q_Score":0,"Tags":"python,django,search","A_Id":45727210,"CreationDate":"2017-08-17T04:54:00.000","Title":"What kind of search should be used","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Say I have this URL \nurl(r'users\/(?P<id>\\d+)\/edit$',TemplateView.as_view(template_name='edit.html'))\nIs there a way to send the <id> to the template within that url pattern definition?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":42,"Q_Id":45733205,"Users Score":1,"Answer":"The kwargs are passed directly onto the template already. You can just to {{ id }}.","Q_Score":0,"Tags":"python,django,rest,templates,view","A_Id":45733426,"CreationDate":"2017-08-17T10:53:00.000","Title":"How to pass Regex named group variable from URL to TemplateView as argument","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to scrape reviews from a website and am not able to scrape reviews having a 'read more' option.\nI am only able to get data till read more.\nI am using BeautifulSoup.\nAny help is appreciated.","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2339,"Q_Id":45735733,"Users Score":0,"Answer":"You will have to use the click option given with selenium that will allow you to find the read more tag or class and click it, as soon as it appear you will have to click it again.. and when it does not shows up you will have to scrap the content you require,","Q_Score":0,"Tags":"python,web-scraping,beautifulsoup,bs4","A_Id":45735827,"CreationDate":"2017-08-17T12:55:00.000","Title":"How to Scrape reviews with read more from Webpages using BeautifulSoup","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a list of 1,000 URLs of articles published by different agencies, and of course each has its own HTML layout.\nI am writing a python code to extract ONLY the article body from each URL. Can this be done by only looking at the < p>< \/p> Paragraph tags?\nWill I be missing some content? or including irrelevant content by this approach?\nThanks","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":80,"Q_Id":45741991,"Users Score":0,"Answer":"To answer your question, it's highly unlikely you can get ONLY article content targeting <p><\/p> tags. You WILL get a lot of unnecessary content that will take a ton of effort to filter through, guaranteed.\nTry to find an RSS feed for these websites. That will make scraping target data much easier than parsing an entire HTML page.","Q_Score":0,"Tags":"python,html-parsing","A_Id":45742170,"CreationDate":"2017-08-17T17:54:00.000","Title":"How to extract article contents from websites with different layouts","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a list of 1,000 URLs of articles published by different agencies, and of course each has its own HTML layout.\nI am writing a python code to extract ONLY the article body from each URL. Can this be done by only looking at the < p>< \/p> Paragraph tags?\nWill I be missing some content? or including irrelevant content by this approach?\nThanks","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":80,"Q_Id":45741991,"Users Score":0,"Answer":"For some articles you will be missing content, and for others you will include irrelevant content. There is really no way to grab just the article body from a URL since each site layout will likely vary significantly.\nOne thing you could try is grabbing text contained in multiple consecutive p tags inside the body tag, but there is still no guarantee you will get just the body of the article.\nIt would be a lot easier if you broke the list of URLs into a list for each distinct site, that would you could define what the article body is case by case.","Q_Score":0,"Tags":"python,html-parsing","A_Id":45742189,"CreationDate":"2017-08-17T17:54:00.000","Title":"How to extract article contents from websites with different layouts","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to create a wizard which has several pages.\nI know how to pass to 'target' new or current, to pass the action to a form or tree view, but what I actually need, before that, is to create several steps which will be on different \"views\" of this wizard, like a form with 'next' and 'back' buttons.\nIs there some example code I can look for that?\nI've searched on default addons, with no success.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":639,"Q_Id":45747880,"Users Score":4,"Answer":"The best way to do this is to have a popup target=new and have a statusbar on top right which will be clickable\/not readonly (so that the user can go back). And depending on the state of your record, show the appropriate fields\nYou can of course create a popup, and when the user clicks next destroy that popup and create another one but that doesn't seem like a good idea to me.","Q_Score":0,"Tags":"python,openerp,qweb","A_Id":45753702,"CreationDate":"2017-08-18T03:08:00.000","Title":"Add button next page - wizard - Odoo v8","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to scrape a rather large website (with around 1 million pages) with Scrapy. The spider works fine and it is able to scrape a few thousand pages before inevitably crashing due to low memory.\nThings I've tried:\n\nUsing the -s JOBDIR=<DIRECTORY>: This gave me an initial improvement and I was able to crawl about twice the number of URLs than with the previous approach. However, even with this option Scrapy's memory consumption slowly increases, until it is killed by the out-of-memory killer.\nPreventing unnecessary functions, such as preventing excessive output by raising the log limit from DEBUG to INFO.\nUsing yield statements instead of returning arrays.\nKeeping the returned data to an absolute minimum.\nRunning the spider on a beefier machine: This helps me crawl a bit more, but inevitably it crashes again at a later point (and I'm nowhere near the 1 million mark).\n\nIs there something I'm missing which can help me with complete the scraping?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":2171,"Q_Id":45771774,"Users Score":1,"Answer":"Don't store any intermediate data. Check if the code going through any infinite loops.\nfor storing URL's, use any queuing broker like RabbitMq or Redis.\nfor final data, store in any DB using the python db connection library (sqlalchemy,mysqlconnecter,pyodc etc depending on the db selected)\nThis can help your code to be run distributed and effienct (remember to use NUllpool or singlepool to avoid too many db connections)\nFor easy and efficient way is using a sqlite db\ninsert 1 million in a table with status as done or notyet\nafter Crawling and storing the URL data into another data table update the URL table to \"done\" from \"notyet\"\nThis helps to keep track of the URLs scraped so for and can restart the script in case any issues and scrape only the not done date.","Q_Score":7,"Tags":"python,python-3.x,web-scraping,scrapy","A_Id":68959793,"CreationDate":"2017-08-19T12:53:00.000","Title":"Is there a way to reduce Scrapy's memory consumption?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am just about ready to deploy my Flask based website but before I do, I would like to know if the Flask framework is loaded for each session or if it is loaded just once on the server.  The reason I ask is because I have a lot of python libraries to load and I want to know if I should load them all at once (if Flask is only loaded once) or load them on a page by page basis (if Flask is loaded for each session).  It is really a question about getting the best performance for the end user.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":53,"Q_Id":45775590,"Users Score":2,"Answer":"Flask and all of your dependencies are loaded once when you start your web server, so no need to worry about startup time.","Q_Score":0,"Tags":"python,flask","A_Id":45775615,"CreationDate":"2017-08-19T19:30:00.000","Title":"Is Flask loaded just once on the server or every time someone visits site?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I would like to basically call a python script from HTML, after the script is called and it finished running, I would like to execute a javascript file(wich I know how to do.) Now my question is: Can I do this with just pure HTML and javascript or do I need to get a library for python? If I dont need a library, how would I go about doing this?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":76,"Q_Id":45787213,"Users Score":0,"Answer":"You can use Two Python libraries.\n\nDjango\nFlask\n\nI recommend Django. Django is easy and fast to make.\nthe Flask is more complex but you can make more detail functions.","Q_Score":0,"Tags":"javascript,python,html","A_Id":45788234,"CreationDate":"2017-08-20T22:08:00.000","Title":"Runnning python script on HTML page","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've successfully used Graphene-Django to successfully build several GraphQL calls.  In all of those cases I populated, in whole or in part, a Django model and then returned the records I populated.\nNow I have a situation where I'd like to return some data that I don't wish to store in the Django model.  Is this possible to do with Graphene?\nRobert","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2118,"Q_Id":45789617,"Users Score":0,"Answer":"When you map your Django model to a GraphQL, it create a new model with GraphQL object types from the introspection of the Django model.. \nAnd nothing prevent you to combine this model with with plain GraphQL objects types, or mapped from an other third party persistence model","Q_Score":5,"Tags":"python,django,django-models,graphene-python","A_Id":45997346,"CreationDate":"2017-08-21T05:06:00.000","Title":"Graphene Django without Django Model?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using python-social-auth for Google authentication in my Django application. Can I override the python-social-auth URLs ? By default, it's http:\/\/mydomain\/login\/google-oauth2\/ and I need to change the URL as part of my view (get request) ; which has the end-point as http:\/\/mydomain\/login\/.","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":339,"Q_Id":45793618,"Users Score":2,"Answer":"The only way to override the URLs is to define your own ones pointing to the views and link it into your main urls.py file.\nIf what you are after for is to make \/login automatically handle the Google auth backend, then you need to define a custom view for it that can call python-social-auth views to fire up the process.","Q_Score":1,"Tags":"python,django,python-social-auth","A_Id":45806230,"CreationDate":"2017-08-21T09:27:00.000","Title":"override python-social-auth built-in urls?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have to download source code of a website like www.humkinar.pk in simple HTML form. Content on site is dynamically generated. I have tried driver.page_source function of selenium but it does not download page completely such as image and javascript files are left. How can I download complete page. Is there any better and easy solution in python available?","AnswerCount":3,"Available Count":1,"Score":-0.0665680765,"is_accepted":false,"ViewCount":1442,"Q_Id":45796411,"Users Score":-1,"Answer":"It's not allowed to download a website without Permission. If you would know that, you would also know there is hidden Code on hosting Server, where you as Visitior has no access to it.","Q_Score":3,"Tags":"javascript,python,html,selenium,web-scraping","A_Id":45796569,"CreationDate":"2017-08-21T11:50:00.000","Title":"Download entire webpage (html, image, JS) by Selenium Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to generate a pdf417 barcode in python using treepoem but pycharm keeps giving me the following error:\nTraceback (most recent call last):\nFile \"C:\/Users\/.\/Documents\/barcodes.py\", line 175, in \n    image = generate_barcode(barcode_type=\"pdf417\",data=barcode, options=dict(eclevel=5, rows=27, columns=12))\n  File \"C:\\Users.\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\treepoem__init__.py\", line 141, in generate_barcode\n    bbox_lines = _get_bbox(code)\n  File \"C:\\Users.\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\treepoem__init__.py\", line 81, in _get_bbox\n    ghostscript = _get_ghostscript_binary()\n  File \"C:\\Users.\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\treepoem__init__.py\", line 108, in _get_ghostscript_binary\n    'Cannot determine path to ghostscript, is it installed?'\ntreepoem.TreepoemError: Cannot determine path to ghostscript, is it installed?\nI've tried to install ghostcript, using both the .exe I found online and using pip install ghostscript (successfully completed the first time, and now tells me the requirement is satisfied), yet I still keep getting this error. Any ideas on how to fix it?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2240,"Q_Id":45828456,"Users Score":1,"Answer":"You are installing on Windows, the Windows binary differs in name from the Linux binaries and indeed differs depending whether  you installed the 64 or 32-bit version.\nOn Linux (and MacOS) the Ghostscript binary is called 'gs', on Windows its 'gswin32' or 'gswin64' or 'gswin32c' or 'gswin64c' depending on whether you want the 32 or 64 bit version, and the command line or windowed executable.\nMy guess is that your script is looking for simply 'gs' and is probably expecting the path to be in the $PATH environment variable, its not clear to me what its expecting.\nYou could probably 'fix' this by making sure the installation path is in the $PATH environment variable and copying the executable to 'gs.exe' in that directory.\nOther than that you'll need someone who can tell you what the script is looking for. Quite possibly you could just grep it.","Q_Score":1,"Tags":"python,ghostscript","A_Id":45833436,"CreationDate":"2017-08-22T23:36:00.000","Title":"Treepoem barcode generator unable to find ghostscript","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Currently I am using odoov8, my problem is that I have created many filters from xml code as per my requirement and all are working fine ,but I can select only one filter at a time .\nso for example I want to apply any 3 Filters in tree view , then I need to select first one , then system loads the data , then I select 2nd and then 3rd filter , so system is loading after applying each filter .\nI want to achieve that if I can select all my filters at once and then I can apply search , so system loads after I apply for search , no matter how much time it taking but I should not require to search single filter .\nso is there any custom module or way from which I can achieve this .\nThanks in advance .","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":712,"Q_Id":45830522,"Users Score":1,"Answer":"I am not aware of any module that implements this.\nThis functionality already exists on the Advanced Search, you add conditions and then click Apply you can take a look at the corresponding widget and copy functionality.\nWhat you need to do is modify the javascript so that upon the clicking of a filter it should be added on the oe_searchview view but the search_read method will not be invoked. You need to start the modifications from web.search.FilterGroup widget and specifically from the search_change method which is invoked every time you click on the filters.","Q_Score":5,"Tags":"javascript,xml,python-2.7,openerp,odoo-8","A_Id":45907926,"CreationDate":"2017-08-23T04:11:00.000","Title":"Apply Multiple filter in odoo at a time","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I built a GUI in JavaFX with FXML for running a bunch of different Python scripts. The Python scripts continuously collect data from a device and print it to the console as it's collected in a loop at anywhere from around 10 to 70 Hz depending on which script was being run, and they don't stop on their own.\nI want the end-user to be able to click a button on my GUI which launches the scripts and lets them see the output. Currently, the best I have done was using Runtime.exec() with the command \"cmd \/c start cmd \/k python some_script.py\" which opens the windows command prompt, runs python some_script.py in it, and keeps the command prompt open so that you can see the output. The problem with this is that it only works on Windows (my OS) but I need to have universal OS  support and that it relies on Java starting an external program which I hear is not very elegant.\nI then tried to remedy this by executing the python some_script.py command in Java, capturing the process output with BufferedReader, creating a new JavaFX scene with just a TextArea in an AnchorPane to be a psuedo-Java-console and then calling .setText() on that TextArea to put the script output in it.\nThis kinda worked, but I ran into many problems in that the writing to the JavaFX console would jump in big chunks of several dozens of lines instead of writing to it line by line as the Python code was making Print() calls. Also, I got a bunch of NullPointerException and ArrayIndexOutOfBoundsException somewhat randomly in that Java would write a couple of hundred lines correctly but then throw those errors and freeze the program. I'm pretty sure both of these issues were due to having so much data at such high data rates which overflowed the BufferedReader buffer and\/or the TextArea.setText() cache or something similar.\nWhat I want to know is what approach I should take at this. I cannot migrate the Python code to Java since it relies on someone else's Python library to collect its data. Should I try to keep with the pseudo-Java-console idea and see if I can make that work? Should I go back to opening a command prompt window from Java and running the Python scripts and then add support for doing the same with Terminal in Mac and Linux? Is there a better approach I haven't thought of? Is the idea of having Java code call Python code and handle its output just disgusting and a horrible idea?\nPlease let me know if you would like to see any code (there is quite a lot) or if I can clarify anything, and I will try my best to respond quickly. Thank you!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":250,"Q_Id":45852491,"Users Score":0,"Answer":"My solution was to still call the Python code from the Java Processbuilder, but use the -u option like python -u scriptname.py to specify unbuffered Python output.","Q_Score":0,"Tags":"java,python,user-interface,javafx,console","A_Id":45989477,"CreationDate":"2017-08-24T03:33:00.000","Title":"JavaFX show looping Python print output","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am writing a lambda function on Amazon AWS Lambda. It accesses the URL of an EC2 instance, on which I am running a web REST API. The lambda function is triggered by Alexa and is coded in the Python language (python3.x).\n\nCurrently, I have hard coded the URL of the EC2 instance in the lambda function and successfully ran the Alexa skill.\n\nI want the lambda function to automatically obtain the IP from the EC2 instance, which keeps changing whenever I start the instance. This would ensure that I don't have to go the code and hard code the URL each time I start the EC2 instance.\n\nI stumbled upon a similar question on SO, but it was unanswered. However, there was a reply which indicated updating IAM roles. I have already created IAM roles for other purposes before, but I am still not used to it.\nIs this possible? Will it require managing of security groups of the EC2 instance?\nDo I need to set some permissions\/configurations\/settings? How can the lambda code achieve this?\n\nAdditionally, I pip installed the requests library on my system, and I tried uploading a '.zip' file with the structure :\n\n\n\n        REST.zip\/\n    \n\n\n            requests library folder\n        \n\n            index.py\n        \n\n\n\nI am currently using the urllib library\n\nWhen I use zip files for my code upload (I currently edit code inline), it can't even accesse index.py file to run the code","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":613,"Q_Id":45854752,"Users Score":2,"Answer":"You could do it using boto3, but I would advise against that architecture. A better approach would be to use a load balancer (even if you only have one instance), and then use the CNAME record of the load balancer in your application (this will not change for as long as the LB exists).\nAn even better way, if you have access to your own domain name, would be to create a CNAME record and point it to the address of the load balancer. Then you can happily use the DNS name in your Lambda function without fear that it would ever change.","Q_Score":0,"Tags":"python,python-3.x,amazon-web-services,amazon-ec2,aws-lambda","A_Id":45856165,"CreationDate":"2017-08-24T06:49:00.000","Title":"Obtain EC2 instance IP from AWS lambda function and use requests library","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I just switched from django 1.3.7 to 1.4.22 (on my way to updating to a higher version of django). I am using USE_TZ=True and TIME_ZONE = 'Europe\/Bucharest'. The problem that I am encountering is a DateTimeField from DB (postgres) that holds the value 2015-01-08 10:02:03.076+02 (with timezone) is read by my django as 2015-01-08 10:02:03.076000 (without timezone) even thou USE_TZ is True.\nAny ideea why this might happen? I am using python 2.7.12 AMD64.\nThanks,\nVirgil","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":32,"Q_Id":45878039,"Users Score":0,"Answer":"Seems I needed to logout once and log in again in the app for it to work. Thanks.","Q_Score":1,"Tags":"python,django","A_Id":45879886,"CreationDate":"2017-08-25T09:09:00.000","Title":"Django offset-naive date from DB","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Would it be possible to upload a file and store it in a session and send that file using requests in python ? Can someone get back with a detailed answer","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":35,"Q_Id":45892395,"Users Score":0,"Answer":"I'm having a hard time understanding your need for this type of implementation.\nAre you trying to pass a JSON file between sessions? or just any type of file?\nIt would help to know your idea behind this implementation.","Q_Score":0,"Tags":"django,python-2.7,python-requests","A_Id":45893315,"CreationDate":"2017-08-26T06:00:00.000","Title":"Handling file field values in session","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am developing django base web service now and I am confused.\nI have three projects as a django projects.\napp1 - use from the end user\napp2 - use from the service providor\napp3 - use from the operator(administrator)\nI made one database from app3(migration) and I created symbolic links (models.py, migrations dir) to app1 and app2.\nAnd then I try to use user authentication system of django from my app1, I got a following error.\nThe above exception (relation \"myapp1_user\" does not exist LINE 1: ...myapp1_user\".\"modify_date\" FROM  ^ ) was the direct cause of the following exception:\nI know what is wrong. It's because I don't have myapp1_user table on my database. I only have app3_user table.\nBut I have no idea how can I configure to work well.\nDoes somebody have any idea?\nPlease let me know.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":151,"Q_Id":45893603,"Users Score":0,"Answer":"when a user signup to app give there three options end user, service provider, administrator. take these fields in BooleanField. so when the user going to sign in then check the true and false for these three user accounts and whichever condition appeaser as true that will be executed.","Q_Score":0,"Tags":"python,django,python-3.x,django-models","A_Id":45894293,"CreationDate":"2017-08-26T08:41:00.000","Title":"Use django authentication system from multiple apps","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I just deployed a flask-python app with elastic beanstalk on AWS but cannot locate my app source files like application.py or templates\/index.html etc\nI've looked at looked at \/var\/..\/.. or \/opt\/..\/.. etc but nowhere to be found.\nIs there an ebs command like $ eb find 'filename.py' etc?","AnswerCount":2,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":2438,"Q_Id":45902751,"Users Score":11,"Answer":"\/opt\/python \u2013 Root of where you application will end up.\n\/opt\/python\/current\/app \u2013 The current application that is hosted in the environment.\n\/opt\/python\/on-deck\/app \u2013 The app is initially put in on-deck and then, after all the deployment is complete, it will be moved to current. If you are getting failures in yourcontainer_commands, check out out the on-deck folder and not the current folder.\n\/opt\/python\/current\/env \u2013 All the env variables that eb will set up for you. If you are trying to reproduce an error, you may first need to source \/opt\/python\/current\/env to get things set up as they would be when eb deploy is running.\nopt\/python\/run\/venv \u2013 The virtual env used by your application; you will also need to run source \/opt\/python\/run\/venv\/bin\/activate if you are trying to reproduce an error","Q_Score":9,"Tags":"python,amazon-web-services,amazon-ec2,amazon-elastic-beanstalk,amazon-linux","A_Id":46018192,"CreationDate":"2017-08-27T07:42:00.000","Title":"Where is my python-flask app source stored on ec2 instance deployed with elastic beanstalk?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"im using slugfield in django model's and i've set slugfield to be unique for a reason so that my post should be unique, my slug include's a combination of title and it's object primary key \nmy slugfield's are generating a slug's as an example like: \n\nslug url : whats-your-favourite-character-from-the-defenders-1\n\nand the number at the end of my slug represent's primary key ' as you see primary key in my slug which already make's an url unique , so does it make sense that i should use unique attribute in slugfield !\nbecause my problem is when i update my existed object it throws an error \nIntegrityError: UNIQUE constraint failed: polls_question.id","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":168,"Q_Id":45907545,"Users Score":0,"Answer":"Making slug unique ensures that it's unique in database so you can rely on it with no worries in your python\/sql code. So it does make sense and that is best practice in general.\nConcerning IntegrityError you need to provide more details. I'm using such fields with no problems.","Q_Score":0,"Tags":"python,django,slug","A_Id":45909584,"CreationDate":"2017-08-27T17:30:00.000","Title":"Does it required a slugfield's must be unique in django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have rather vast implementation of functionality needed for processing specific type of data stored in my Django DB (7 interconnected files containing ~100 lines of code each). There's a facade method in one of those files that I call from related method in views.py so that there is no mess inside of views file.  \nFor now I put everything inside a new folder in the same directory where settings.py urls.py and wsgi.py are, but now every time I'm calling makemigrations I receive a handful of unrelated information that has nothing to do with changes in data model.\nWhat is the best place to store those routines?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":201,"Q_Id":45907643,"Users Score":0,"Answer":"Placing additional python files alongside your settings.py should not create migration errors in the normal case. Are you sure these files are causing the errors?\nTo you question:\n\nIf you will use those functions inside a single app, you could create a subdirectory inside that app, for example utils; it should be on the same level as the migrations and templates directories of the app.\nHowever, if you will be using those functions inside many apps you could create a new app without models and migrations, lets call it custom_utils, in which you can place all your functions.","Q_Score":1,"Tags":"python,django","A_Id":49237591,"CreationDate":"2017-08-27T17:39:00.000","Title":"Where to put routines in Django project?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"i am student and i am totally new to scraping etc, today my supervisor gave me task to get the list of followers of a user or page(celebrity etc)\nthe list should contain information about every user (i.e user name, screen name etc)\nAfter a long search i found that i can't get the age and gender of any user on twitter.\nsecondly i got help regarding getting list of my followers but i couldnt find help about \"how i can get user list of public account\"\nkindly suggest me that its possible or not, and if it is possible, what are the ways to get to my goals\nthank you in advance","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":279,"Q_Id":45923490,"Users Score":0,"Answer":"Hardly so, and even if you manage to somehow do it, you'll most likely get blacklisted. Also, please read the community guidelines when it comes to posting questions.","Q_Score":0,"Tags":"python,twitter,web-scraping,text-mining,scrape","A_Id":45959340,"CreationDate":"2017-08-28T16:26:00.000","Title":"is it possible to scrape list of followers of a public twitter acount (page)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How can we join\/combine two models in Transfer Leaning in KERAS? \nI have two models:\nmodel 1 = My Model\nmodel 2 = Trained Model\nI can combine these models by putting the model 2 as input and then passed its output to the model 1, which is the conventional way.  \nHowever, I am doing it in other way. I want to put the model 1 as input and then passed its output to the model 2 (i.e. trained model one).","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2275,"Q_Id":45924742,"Users Score":0,"Answer":"The issue has been resolved.\nI used the model.add()function and then added all the required layers of both Model 1 and Model 2.\nThe following code would add the first 10 layers of Model 2 just after the Model 1.\nfor i in model2.layers[:10]:\n    model.add(i)","Q_Score":1,"Tags":"python,tensorflow,deep-learning,keras,pre-trained-model","A_Id":45928049,"CreationDate":"2017-08-28T17:50:00.000","Title":"Joining\/Combining two models for Transfer Leaning in KERAS","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Basically I'm building a chatbot using python. When running on python, I can display the answer with multiple lines by using \\n tag. However , when I bring it to HTML to display it on website using Flask, it cannot render \\n tag so there is no line break.\nI have also tried to replace \\n to  <br\/> but no help. It prints out the br tag instead of converting it to a line break.\nPlease guide.","AnswerCount":4,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":2578,"Q_Id":45930229,"Users Score":0,"Answer":"Try using these options. \nIf your content-type is html, then use\n\"String to be displayed\"+\"<br \\>\"+\"The string to be displayed in new line\"\nElse, If your content-type is plain text then use\n\"String to be displayed\"+\"\\n\"+\"The string to be displayed in new line\"","Q_Score":1,"Tags":"python,html,css,line,newline","A_Id":56186862,"CreationDate":"2017-08-29T03:26:00.000","Title":"How to break line on html when use string from python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Basically I'm building a chatbot using python. When running on python, I can display the answer with multiple lines by using \\n tag. However , when I bring it to HTML to display it on website using Flask, it cannot render \\n tag so there is no line break.\nI have also tried to replace \\n to  <br\/> but no help. It prints out the br tag instead of converting it to a line break.\nPlease guide.","AnswerCount":4,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":2578,"Q_Id":45930229,"Users Score":0,"Answer":"in some textArea  <br\/> will not word\nyou can use &#10; to brekline\njust like use &nbsp; to stand for  space in html","Q_Score":1,"Tags":"python,html,css,line,newline","A_Id":45930326,"CreationDate":"2017-08-29T03:26:00.000","Title":"How to break line on html when use string from python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am running python script using supervisor. Script has function timezone.now(). This always returns date when I started supervisor.\nI am not able to find out why timezone giving the wrong date.\nCan anyone help?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":485,"Q_Id":45932262,"Users Score":0,"Answer":"change your TIME_ZONE in settings.py\nTIME_ZONE =  'Asia\/Kolkata'\nand then try datetime.now() it will give time in IST","Q_Score":1,"Tags":"django,python-2.7,django-rest-framework","A_Id":45932377,"CreationDate":"2017-08-29T06:35:00.000","Title":"Django timezone.now() not returning current datetime when script running using supervisor","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using Django as my backend and inside my iOS application , I am fetching data through API's. I have a UITableView where I am fetching a list of places which also have a rating value with them. After implementing the refresh control I noticed that whenever I used to refresh, it used to append the new data in the array and created duplicity. I thought of a very simple solution which is that we can actually empty our array when refreshing so that we can avoid duplicity. Is it the most efficient way to do this? I am concerned because right now I have 3 places in my backend which I am trying to fetch and what about when there will be hundreds , will we have any performance impact ?","AnswerCount":3,"Available Count":1,"Score":0.0665680765,"is_accepted":false,"ViewCount":104,"Q_Id":45933457,"Users Score":1,"Answer":"I think best approach will be pagination. Fetch like 10 or 20 data in the beginning and save it in an array and load tableview. When user starts scrolling the tableview in method willDisplayCell increase page count and fetch next 10 or 20 data from server and append it in the array.","Q_Score":0,"Tags":"python,ios,swift,django,uitableview","A_Id":45933635,"CreationDate":"2017-08-29T07:46:00.000","Title":"Refreshing Table View Efficiently","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"excuse my English\nI'm beginner in django and i want to achieve this in my model and form:\nthe scenario is like purchasing shoes on amazon:\n1. the shoes has list of size a user can select form \n2. the user select and add it to the cart \n3. user place an order which is saved in a model with the respective size included\nnow imagine a shoe seller when selling can enter a list of sizes like this in python size = [1, 2, 3, 4] which is also saved on a shoe-model \nhow can implement this in django and how to save a list of size entered but a seller to  a model and how can i display this list so the user can select only one of the value of this list?\nplease help","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":858,"Q_Id":45947457,"Users Score":0,"Answer":"You can convert the list to json and store it in a charfield.","Q_Score":1,"Tags":"python,django,python-3.x,django-models","A_Id":45951472,"CreationDate":"2017-08-29T20:01:00.000","Title":"Django: how can i get a model that store a list(like in python or anyway) of a sizes of a shoes","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"URL structure look liks this: <domain>\/<version>\/<collection>\/<sub-collection>\/<page> where domain is anything a-zA-Z0-9\\-\\_, version is anything a-zA-Z0-9\\-\\_\\. (But would likely be only 1.0, 1.1, 2.0.0 etc) and both collection and sub-collection are optional groups which follow <domain> restraints.\nCurrent regex is: r'^(?P<domain_slug>[a-zA-Z0-9\\-\\_]*)\\\/(?P<version_slug>[a-zA-Z0-9\\-\\_\\.]*)\\\/(?P<slug>[a-zA-Z0-9\\-\\_]+)\\\/$.\nHow can I capture optional positions, ensuring the last segment is always the page?\nAdditionally, is this even a good idea? Would it be better to just pass this through the Django URL conf and let a view function handle all the work?\nExample URLs could include:\nadministration\/5.0.3\/reset-user-password\nuser\/1.0\/getting-started\/setting-up-an-account\ndevelopment\/3.2\/authentication\/acl\/creating-aco","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":44,"Q_Id":45951244,"Users Score":1,"Answer":"(.*\\\/)([^\\\/]*)$ will put the page in $2 and something you'll have to parse in $1.\nOP added:\nThe above did the trick. For reference, the full regex became (multi-lined for readability):\n^(?P<domain>[a-zA-Z0-9\\_\\-]*)\/\n  (?P<version>[a-zA-Z0-9\\-\\_\\.]*)\/\n  (?P<collections>.*)\/\n  (?P<page>[^\\\/]*)$","Q_Score":0,"Tags":"python,regex,django,url","A_Id":45970813,"CreationDate":"2017-08-30T03:05:00.000","Title":"Complex Python Regex for Django View","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"The Goal: Once a user has signed up they start a challenge. Once they've started the challenge I'd like to be able to send users weekly emails for 12 weeks (Or however long the challenge lasts for). Bearing in mind, one user may sign up today and one may sign up in three months time. Each week, the email will be different and be specific to that week. So I don't want the week one email being sent alongside week 2 for 12 weeks.\nShould I add 12 boolean fields inside the extended User model, then run checks against them and set the value to True once that week gas passed?\nAssuming this is the case. Would i then need to setup a cron task which runs every week, and compares the users sign up date to todays date and then checks off the week one boolean? Then use the post_save signal to run a check to see which week has been completed and send the 'week one' email?\nI hope that makes sense and i'm trying to get my head around the logic. I'm comfortable with sending email now. It's trying to put together an automated process as currently it's all manual.\nPlease let me know if I need to elaborate on anything. Any help would be much appreciated.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":752,"Q_Id":45955464,"Users Score":2,"Answer":"The easiest way would be something like this:\n\nMake a table e.g. challenge in database with following cols: challenge_name, week1, week2, ..., as much weeks as you need. Make them nullable, so if some challenge is shorter, the rest of weeks can be null.\nIn users table (or you can make new one) add two cols, one for active challenge, the other for day started.\nThen yes, you can run cron job daily, or maybe twice a day, in the morning and in the afternoon, that executes python function for sending mail. In that function you go through all users, check their current challenge, calculate the week they are in, query table challenge for mail content and then send.\n\nI think this is the best solution, certainly the most simple and solid one :)","Q_Score":1,"Tags":"python,django,email","A_Id":45955886,"CreationDate":"2017-08-30T08:24:00.000","Title":"Send weekly emails for a limited time after sign up in django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an existing python\/django app with jinja template engine.\nI have a template with a filter and a list the gets rendered correctly via server, also the filters work perfectly without javascript.\n(based on url with parameters)\nThe server also responds with json if the same filter url is requested by ajax. So it's ready for an enhanced version.\nNow:\nI would like to make it nicer and update\/rerender the list asynchronously when I change the filter based on the json response I receive.\nQuestions:\n\nWhen I init the vue on top of the page template, it removes\/rerenders everything in the app. All within the vue root element becomes white.\nCan I declare only parts of my whole template ( the one filter and the list) as separate vue components and combine these instances (there are other parts that are not part of the async update part vue should not take of)\nCan I somehow use the existing markup of my components in jinja to be used to rerender the components again with vue or do I have to copy paste it into javascript (please no!) ?\n\nTLDR: I don't wan't to create the whole model with vue and then prerender the whole app (modern SSR way) and vue will find out the diff.\nI just want to use vue on top of an existing working django app.","AnswerCount":1,"Available Count":1,"Score":-0.1973753202,"is_accepted":false,"ViewCount":464,"Q_Id":45959832,"Users Score":-1,"Answer":"I think the best method really is to split up the front and backend into two seperate entities, communicating via an API rather than bleeding the two together as in the long run it creates headaches.","Q_Score":0,"Tags":"python,django,vue.js,vue-component,server-side-rendering","A_Id":45959886,"CreationDate":"2017-08-30T11:58:00.000","Title":"Vue.JS on top of existing python\/django\/jinja app for filter and list render","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Hope you have a great day. I have a table with 470 columns to be exact. I am working on Django unit testing and the tests won't execute giving the error when I run command python manage.py test: \n\nRow size too large (> 8126). Changing some columns to TEXT or BLOB or using ROW_FORMAT=DYNAMIC or ROW_FORMAT=COMPRESSED may help. In\n  current row format, BLOB prefix of 768 bytes is stored inline\n\nTo resolve this issue I am trying to increase the innodb_page_size in MySQL my.cnf file. When I restart MySQL server after changing value in my.cnf file, MySQL won't restart.\nI have tried almost every available solution on stackoverflow but no success.\nMYSQL version=5.5.57\nUbuntu version = 16.04\nAny help would be greatly appreciated. Thank you","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":978,"Q_Id":45964972,"Users Score":0,"Answer":"Since I have never seen anyone use the feature of having bigger block size, I have no experience with making it work.  And I recommend you not be the first to try.\nInstead I offer several likely workarounds.\nDon't use VARCHAR(255) blindly; make the lengths realistic for the data involved.\nDon't use uf8 (or utf8mb4) for columns that can only have ascii.  Examples: postcode, hex strings, UUIDs, country_code, etc.  Use CHARACTER SET ascii.\nVertically partition the table.  That is spit it into two tables with the same PRIMARY KEY.\nDon't splay arrays across columns; use another table and have multiple rows in it.  Example:  phone1, phone2, phone3.","Q_Score":0,"Tags":"python,mysql,django,unit-testing,innodb","A_Id":46018456,"CreationDate":"2017-08-30T15:58:00.000","Title":"Changing innodb_page_size in my.cnf file does not restart mysql database","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"This is what I did to change the name of my django app which has classes under models\nI deleted the database and the migration folder. Then I ran the migration again and the tables were created ( mariadb). All works fine. Except when I run \npython manage.py shell which starts the interpretor alright. But when I try to from main.models import Teacher I get a LookupError: No installed app with label 'models' . Teacher being the class under models.py of the app main. Main is what I had renamed my earlier app 'foo' to","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":185,"Q_Id":45974470,"Users Score":0,"Answer":"Use relative import from .models import Teacher instead if you are inside your app main.","Q_Score":1,"Tags":"python,django,shell","A_Id":45974601,"CreationDate":"2017-08-31T06:15:00.000","Title":"Changed the name of django app.Now python manage.py shell cant see the models.","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"This is what I did to change the name of my django app which has classes under models\nI deleted the database and the migration folder. Then I ran the migration again and the tables were created ( mariadb). All works fine. Except when I run \npython manage.py shell which starts the interpretor alright. But when I try to from main.models import Teacher I get a LookupError: No installed app with label 'models' . Teacher being the class under models.py of the app main. Main is what I had renamed my earlier app 'foo' to","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":185,"Q_Id":45974470,"Users Score":0,"Answer":"Editing the Answer. I misunderstood the question earlier\nHey, if the server is running and site is working as expected (as you mentioned) and you are facing problems only in shell, you just have to close the shell and reopen it.\nHowever, here it seems that you have not added init.py file in the new folder as it can not fing models.py. If that is not the case, please edit the question to show the list of installed apps and the entire stack trace.","Q_Score":1,"Tags":"python,django,shell","A_Id":45974639,"CreationDate":"2017-08-31T06:15:00.000","Title":"Changed the name of django app.Now python manage.py shell cant see the models.","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've built a very simple assistant app in python which can do very basic tasks like taking notes, reminding you, stopwatch, timer, web scrape for news feeds etc. tkinter seems confusing and looks oldish to me. On the other hand, css js seems much easier to design gui side and way more elegant looking. Is it possible to design a desktop gui app (may be with electron?) using HTML+CSS+JavaScript but it will run my old python codes?\nI've been coding for only two months and i suck at it. Please excuse my newbiness.\nTLDR: Simply, i want to make the gui side using HTML+CSS+JavaScript to take user input but then it will run python scripts and shows output in the gui app. Is it possible?","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":2102,"Q_Id":45986266,"Users Score":0,"Answer":"The popular form of Javascript or ES6 (which you are talking about) is designed to run in browser, so, the limitations are that it can only make calls via browser, i.e. it cannot directly interact with the OS like python's OS module. This means you will need a web-service in your computer that would run a specific python code and return you the responses, this requires a web-service\/web-framework, preferably python's like Django, Flask which will run the python script for you because they can make OS calls on the server machine. I do think other non-python web-services are cacpable to do so, but of course, the natural preference would be 'Python-based services'. \n Sidenote: \nIf the case was with Node.js(i.e. the server-side js) and not ES6(client-side browser-run)  you would have an upperhand i.e. you could invoke python scripts on your server because node.js like the python-based web-servers do support os calls.","Q_Score":0,"Tags":"javascript,python,html,css,user-interface","A_Id":45986589,"CreationDate":"2017-08-31T16:32:00.000","Title":"Is it possible to design GUI with HTML+CSS+JavaScript but it will actually run python script?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've built a very simple assistant app in python which can do very basic tasks like taking notes, reminding you, stopwatch, timer, web scrape for news feeds etc. tkinter seems confusing and looks oldish to me. On the other hand, css js seems much easier to design gui side and way more elegant looking. Is it possible to design a desktop gui app (may be with electron?) using HTML+CSS+JavaScript but it will run my old python codes?\nI've been coding for only two months and i suck at it. Please excuse my newbiness.\nTLDR: Simply, i want to make the gui side using HTML+CSS+JavaScript to take user input but then it will run python scripts and shows output in the gui app. Is it possible?","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":2102,"Q_Id":45986266,"Users Score":0,"Answer":"It can't be done, you'd have to make it like a web app (although with local webserver serving python responses)\nEDIT:\nif you don't mind running it in webbrowser, you can make quite easily webserver, that will evaluate your queries...","Q_Score":0,"Tags":"javascript,python,html,css,user-interface","A_Id":45986381,"CreationDate":"2017-08-31T16:32:00.000","Title":"Is it possible to design GUI with HTML+CSS+JavaScript but it will actually run python script?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a python wsgi app that is configured to be run with uwsgi which is installed in the app's virtual environment. The app's main functionality is to retrieve files from a database. I need to test this functionality while running the app with uwsgi. At the same time I need to mock the outputs of the function that connects to the database. When running uwsgi this proves to be a hard (impossible?) thing to do.\nThe main app is called app.py. In the same directory there's a tests module (dir with init.py) with tests. I try to patch the function's output with patch (form unittest.mock), then open the web-page with selenium in a test case, all while uwsgi is running. But uwsgi's ouput seems unaffected by the patching, uwsgi just uses the real function from app.py.\nWhat could I possibly do to achieve the required behaviour? I need to test how the app works with uwsgi, and at the same time can not use any database.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":367,"Q_Id":45997744,"Users Score":2,"Answer":"This seems like you're mixing up different levels of testing. Mocking\/patching is appropriate for a unit test, where you test a function in isolation. What you're describing is an integration test; here, rather than patching, you should set up your app to run with a test database.","Q_Score":2,"Tags":"python,unit-testing,selenium,uwsgi","A_Id":45997798,"CreationDate":"2017-09-01T10:00:00.000","Title":"Unittest + Mock + UWSGI","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need help to understand how I can:\n1) Choose which virtualenv my django project should use?\nAs I understood maybe I'm wrong! when I activate the virtualenv, that one my project will be using. \nBut what about if I'm running on 2 different projects on a single server and each one should use it's own virtualenv?\nI'm looking for your help :)","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":52,"Q_Id":46005960,"Users Score":0,"Answer":"This is how I do it .  \n\nCreate virtualenv.\nActivate the virtualenv.\nInstall Django and other packages in virtualenv.\npython manage.py runserver...  \n\nPerhaps is not so much a case of Django using the virtualenv, as the virtualenv using Django.","Q_Score":0,"Tags":"python,django,virtualenv","A_Id":46009125,"CreationDate":"2017-09-01T18:19:00.000","Title":"How to specify which virtualenv to use in my django project?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a droplet from DigitalOcean. It runs Ubuntu 16.04. By default, it is using Python2. \nI have a website created with Django. I want to setup a virtual env and run python 3 in the virtual environment. The HTTP server in the droplet is NGINX. \nHow can I let the droplet pick up the python 3 in the virtual environment as the python for my Django project?\nThank!","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":255,"Q_Id":46009089,"Users Score":1,"Answer":"s   virtualenv -p python3 envname or virtualenv -p \/usr\/bin\/python3 <venv-name> that's going to create a virtualenv with python3, tell me if I misunderstood the question","Q_Score":0,"Tags":"python,django,nginx,virtualenv,digital-ocean","A_Id":46009209,"CreationDate":"2017-09-01T23:27:00.000","Title":"How to setup python 3 from virtual environment as the default python for Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to scrape a dynamic content (javascript) page with Python + Selenium + BS4 and the page blocks my requests at random (the soft might be: F5 AMS).\nI managed to bypass this thing by changing the user-agent for each of the browsers I have specified. The thing is, only the Chrome driver can pass over the rejection. Same code, adjusted for PhantomJS or Firefox drivers is blocked constantly, like I am not even changing the user agent.\nI must say that I am also multithreading, that meaning, starting 4 browsers at the same time.\nWhy does this happen? What does Chrome Webdriver have to offer that can pass over the firewall and the rest don't?\nI really need to get the results because I want to change to Firefox, therefore, I want to make Firefox pass just as Chrome.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":181,"Q_Id":46011743,"Users Score":1,"Answer":"Two words: Browser Fingerprinting.  It's a huge topic in it's own right and as Tarun mentioned would take a decent amount of research to nail this issue on its head.  But possible I believe.","Q_Score":0,"Tags":"python,selenium,web-scraping,selenium-chromedriver,geckodriver","A_Id":46012320,"CreationDate":"2017-09-02T08:02:00.000","Title":"How does Chrome Driver work, but Firefox, PhantomJS and HTMLUnit not?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm watching the udemy Django tutorial that requires using JavaScript as the front-end and Python for the back-end:\n\nCan you replace JavaScript with Python?\nWhat are the advantages and disadvantages of that?","AnswerCount":3,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":17671,"Q_Id":46016736,"Users Score":8,"Answer":"No, python can't be used in frontend.\nYou need frontend technologies like html, css, javascript, jQuery etc...\nfor frontend. \nPython can be used as scripting language in backend.","Q_Score":12,"Tags":"javascript,django,python-3.x,frontend,backend","A_Id":46016757,"CreationDate":"2017-09-02T18:05:00.000","Title":"Can you use Python for both front end and back end using Django framework?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Does Scrapy ping the website every time I use response.xpath? Or is there one response value stored in memory per request and all subsequent xpath queries are run locally?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":98,"Q_Id":46020031,"Users Score":0,"Answer":"Response is stored in memory. That said, every time you call response.xpath it doesn't hit the website on the matter but memory.","Q_Score":1,"Tags":"python,web-scraping,scrapy,scrapy-spider","A_Id":46020248,"CreationDate":"2017-09-03T03:33:00.000","Title":"Optimizing Scrapy xpath queries","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Anybody knows why it's not possible to generate an invoice after that the POS session is closed an the POS orders are booked?\nAnd how to fix this","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":428,"Q_Id":46054748,"Users Score":1,"Answer":"It does not need be fixed, because it is not a bug, when you close the session you post the entries and reconcile payments, and I see that for security reasons too, you don't want some user invoiced a yesterday pos order, he could use the invoice for money laundering(I exaggerated the event).","Q_Score":0,"Tags":"python,odoo-8,invoice,point-of-sale,accounting","A_Id":46104613,"CreationDate":"2017-09-05T12:14:00.000","Title":"Odoo POS create invoice after POS session is closed","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've been building my Flask app from a little code I found in a tutorial. My Flask app is using Bootstrap, WTForms and Jinja to render the HTML files. I would like to clean up since I don't think I need Bootstrap.\n\nCan you use Jinja and WTForms without Bootstrap? I'm pretty sure you\ncan but I found a lot of examples that have code like {{\nwtf.form_field(form.username) }} which is making me insecure.\nWhat is the advantage of {{ wtf.form_field(form.field1) }} instead\nof {{ form.name.label }} {{ form.name(size=20) }}?\nCan you use Flask without Bootstrap? I don't want to include\nall those files.","AnswerCount":1,"Available Count":1,"Score":0.537049567,"is_accepted":false,"ViewCount":456,"Q_Id":46057558,"Users Score":3,"Answer":"Jinja is a rendering engine. It doesn't care what it's rendering, and that includes not caring that you decided to use Twitter Bootstrap to lay out your HTML page.\nwtf.form_field is a macro from Flask-Bootstrap that handles rendering the label, input, errors, and other information with Bootstrap's CSS. There is no requirement that you use it. You can look at its source to see what you would need to do instead.\nThere is nothing wrong with using pre-made CSS like Bootstrap, or libraries like Flask-WTF and Flask-Bootstrap, to handle parts of the application you don't want to deal with.","Q_Score":0,"Tags":"python,twitter-bootstrap,flask,jinja2","A_Id":46057739,"CreationDate":"2017-09-05T14:33:00.000","Title":"Can you use Jinja without Bootstrap in Flask?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm new to Pycharm IDE. Previously have been using Atom editor and a shell.  I am working in Windows 7.\nTonight I created a small Django project in Pycharm.  I used the \"Tools:  Run manage.py task\" menu option.  Then I ran runserver from the terminal it opened.\nThis launched my server at http:\/\/127.0.0.1:8000, as expected.\nBut later I accidentally closed the manage.py window pane in pycharm ide.  The server continues to run.  Even after I closed Pycharm,  the server remains running. \nHow do I stop it?!?!  Embarassing.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2346,"Q_Id":46078899,"Users Score":0,"Answer":"First kill django server using \nsudo lsof -t -i tcp:8000 | xargs kill -9\nWhatever PORT you are using you can replace with 8000 with it.\nRight click on project main directory(Having Setting.py) ->Mark\ndirectory as-> Source Root\nEdit Configuration Working Directory: leave blank \n\nAnd then click on run Button.\nIt worked for me. I am using linux system, Not sure for Windows but this should work for windows too.","Q_Score":3,"Tags":"python,django,pycharm","A_Id":46081739,"CreationDate":"2017-09-06T15:15:00.000","Title":"Started a django server from inside Pycharm, but now I cannot turn it off","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying an application to write an application on which I have used a client\/server architecture. The client side is developed using .NET\\C# and the server side is developed on python. To communicate the both sides, I used first tcp\/ip socket; so i put my python's methods on a loop then I ask each time from my c# application to run an method. This idea is very bad as it require to cover all use cases that can be happening on network or something like that. After a work of search, I have found three technologies that can answer a client\/server architecture which are RPC, RMI and WCF. RMI a java oriented solution so it is rejected. So, my question here is: does RPC and WCF support multi programming languages (interoperability) especially betwenn C# and python?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":525,"Q_Id":46080092,"Users Score":1,"Answer":"I'm not sure I completely understand your use case, but I would suggest having a look at a REST API approach if you need to have .Net talk to Python, or vice versa.","Q_Score":0,"Tags":"c#,python,wcf,client-server,rpc","A_Id":46080832,"CreationDate":"2017-09-06T16:20:00.000","Title":"Client Server architecture using python and C#","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a python script which resides on a web-server (running node.js) and does some machine learning computation. The data has to be supplied to the python script using javascript running in web-browser. How can this be done? I want to know the complete setup. For now, the server is the localhost only.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":951,"Q_Id":46098385,"Users Score":0,"Answer":"I believe you need a simple API on the server which accept input from the client which can be done via JavaScript.\nThere are several technologies you could have a look at:\n\nAjax.\nWebSockets.","Q_Score":1,"Tags":"javascript,python,node.js,socket.io","A_Id":46098475,"CreationDate":"2017-09-07T14:01:00.000","Title":"communicate between python script on server side and javascript in the web-browser","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm looking for a way to show html to a user if they call from a browser or just give them the API response in JSON if the call is made from an application, terminal with curl or generally any other way.\nI know a number of APIs do this and I believe Django's REST framework does this.\nI've been able to fool a number of those APIs by passing in my browser's useragent to curl so I know this is done using useragents, but how do I implement this? To cover every single possible or most useragents out there.\nThere has to be a file\/database or a regex, so that I don't have to worry about updating my useragent lists every few months, and worrying that my users on the latest browsers might not be able to access my website.","AnswerCount":2,"Available Count":1,"Score":0.2913126125,"is_accepted":false,"ViewCount":1500,"Q_Id":46099439,"Users Score":3,"Answer":"I know this post is a few years old, but since I stumbled upon it...\ntldr; Do not use the user agent to determine the return format unless absolutely necessary.  Use the Accept header or (less ideal) use a separate endpoint\/URL.\nThe standard and most future-proof way to set the desired return format for a specific endpoint is to use the Accept header.  Accept is explicitly designed to allow the client to state what response format they would like returned.  The value will be a standard MIME type.\nWeb browsers, by default, will send text\/html as the value of the Accept header.  Most Javascript libraries and frontend frameworks will send application\/json, but this can usually be explicitly set to something else (e.g. text\/xml) if needed.  All mobile app frameworks and HTTP client libraries that I am aware of have the ability to set this header if needed.\nThere are two big problems with trying to use user agent for simply determining the response format:\n\nThe list will be massive.  You will need to account for every possible client which needs to be supported today.  If this endpoint is used internally, this may not be an immediate problem as you might be able to enforce which user agents you will accept (may cause its own set of problems in the future, e.g. forcing your users to a specific version of Internet Explorer indefinitely) which will help keep this list small. If this endpoint is to be exposed externally, you will almost certainly miss something you badly need to accept.\nThe list will change.  You will need to account for every possible client which needs to be supported tomorrow, next week, next year, and in five years.  This becomes a self-induced maintenance headache.\n\nTwo notes regarding Accept:\n\nPlease read up on how to use the Accept header before attempting to implement against it.  Here is an actual example from this website: text\/html,application\/xhtml+xml,application\/xml;q=0.9,image\/avif,image\/webp,image\/apng,*\/*;q=0.8,application\/signed-exchange;v=b3;q=0.9.  Given this, I would return back HTML.\nThe value of the header can be *\/*, which basically just says \"whatever\" or \"I don't care\".  At that point, the server is allowed to determine the response format.","Q_Score":2,"Tags":"python,api,curl,user-agent","A_Id":69885034,"CreationDate":"2017-09-07T14:52:00.000","Title":"How to detect if a GET request is from a browser or not","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have fresh ubuntu 16.04 setup for production.\nInitially if when i type\npython --version gives me python 2.7 and python3 --version gives me python 3.5\nbut i want python points to python3 by default, so in my ~\/.bashrc\nalias python=python3 and source ~\/.bashrc,\nAfter that i install pip using sudo apt-get install python-pip and when i type pip --version it prints pip 8.1.1 from \/usr\/lib\/python2.7\/dist-packages (python 2.7) instead that i want packages to be installed into and get from \/usr\/local\/lib\/python3.5\/dist-packages.\nI have django application which is written with python3 compatible code. \nUpdate:  I want to install other packages which have to load from python3 dist-packages not just pip. I don't want to remove python 2.7 from ubuntu it will break other programs, i thought alias python=python3 would install packages into python3.5 dist-packages as well.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":421,"Q_Id":46107451,"Users Score":0,"Answer":"You need to use pip3 as the command.\npip3 install coolModule\nBe sure to add to your bash profile.\nalias pip3=\"python3 -m pip\"","Q_Score":1,"Tags":"python,ubuntu","A_Id":46107476,"CreationDate":"2017-09-08T01:51:00.000","Title":"python3 loading dist-packages from python2 on ubuntu","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"What's the difference between django mongoengine and mongoengine\nCan i use django default\/build-in form mongodb","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1335,"Q_Id":46126827,"Users Score":1,"Answer":"Django-mongoengine is a django extension that provides integration with MongoEngine. It is basically like other django-extensions which provides added features.\nBut MongoEngine is a Document-Object Mapper (think ORM, but for document databases) for working with MongoDB from Python. \nAs it uses a simple declarative API, similar to the Django ORM, Django-mongoengine make it work with django. But it is exclusively for working with mongodb using python.\n\nNote\n\nIf you use only mongodb then, you can't use admin functionality of Django. You can try using django-non rel. But I will not suggest to go with that. Coz it works with Django-1.3 which is quite old.\nIf you want to use the admin functionality also and mongodb also then you can use 2 databases first the relational one for admin functionality and then mongodb for other purposes.","Q_Score":4,"Tags":"python,django,mongodb,mongoengine","A_Id":46126865,"CreationDate":"2017-09-09T03:20:00.000","Title":"Difference between django mongoengine vs mongoengine","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"When I try to install pyrebase i get this error message.\n\nPermissionError: [Errno 13] Permission denied:\n  \/Users\/myname\/anaconda\/lib\/python3.6\/site-packages\/google\/api\n\nwhat can I do?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":351,"Q_Id":46133715,"Users Score":1,"Answer":"You need root\/Administrator privileges.\nOn linux use sudo before command and on Windows you can open a command prompt as administrator by right clicking it and selecting run as administrator.","Q_Score":0,"Tags":"python,pip","A_Id":46133986,"CreationDate":"2017-09-09T18:13:00.000","Title":"how can I fix permission denied error while trying to install pyrebase","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I\u00b4m trying to make a whatsapp button but I\u00b4m having problems with the trailing slash at the end on the href.  Whatsapp renders wrongly with the trailing slash.\nI\u00b4m using wagtail and puput. I\u00b4d like to do it on template only because wagtail and puput are addons on divio. If I install them separatedly, I would have to remake my website, so I can\u00b4t change models.py.\nI\u00b4m using {% canonical_url entry %} for the href. What I\u00b4d like to have would be something like {% canonical_url|slice:\":-1\" entry %}\nThey provide full_url placeholder, but it doesn\u00b4t add date to link. It gives foo.com\/slug instead of foo.com\/2017\/09\/01\/slug so everything gets rendered wrong too.\nAny suggestions? \nThanks!","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":192,"Q_Id":46143290,"Users Score":2,"Answer":"It should be possible to use {% canonical_url entry as url %} to get the desired URL as the variable url, rather than outputting it directly from the tag. After that, you can perform the slicing on the variable using {{ url|slice:\":-1\" }}.","Q_Score":0,"Tags":"python,django,wagtail","A_Id":46143467,"CreationDate":"2017-09-10T17:01:00.000","Title":"Is it possible to apply slicing to django function on template?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've been developing a web interface for a simple raspberry pi project. It's only turning lights on and off, but I've been trying to add a dimming feature with PWM.\nI'm using modWSGI with Apache, and RPi.GPIO for GPIO access. For my prototype I'm using (3) SN74HC595's in series for the LED outputs, and am trying to PWM the OE line to dim the lights.\nOperating the shift registers is easy, because they hold the outputs in between updates. However, for PWM to work the GPIO.PWM instance must stay active between WSGI sessions. This is what I'm having trouble with. I've been working on this for a few days, and saw a couple similar questions here. But nothing for active objects like PWM, only simple counters and such.\nMy two thoughts are:\n1) Use the global scope to hold the PWM object, and use PWM.ChangeDutyCycle() in the WSGI function to change brightness. This approach has worked before, but it seems like it might not here.\nOr 2) Create a system level daemon (or something) and make calls to that from within my WSGI function.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":130,"Q_Id":46157465,"Users Score":0,"Answer":"For anyone looking at this in 2020:\nI changed mod_wsgi to single thread mode. I'm not sure if it's related to Python, mod_wsgi, or bad juju, but it still would not last long term. After a few hours the PWM would stop at full off.\nI tried rolling my own PWM daemon, but ultimately went with the pigpio module (is Joan on SE?). It's been working perfect for me.","Q_Score":0,"Tags":"raspberry-pi,python-3.4,mod-wsgi","A_Id":47499801,"CreationDate":"2017-09-11T13:56:00.000","Title":"Object persistence in WSGI","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am designing a backend service that sends to some mobile app user messages from my server. \nHaving retrieved their device token using a webhook, should I store these tokens in DB and call create_platform_endpoint() every time I need to send a message? \nOr storing device token on backend is needless and excessive and once having obtained ARN from create_platform_endpoint(), there is no need to store mobile device tokens on backend?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":359,"Q_Id":46161694,"Users Score":1,"Answer":"I would store the device token (and I do).  I was able to use it when I needed to transparently migrate a few million endpoints from a US region to one in Asia.  Might also come in handy if you also wanted to migrate off of AWS at some point. \n The only reason I wouldn't store it is because of GDPR, but if you're not worried about that then it's not like it's a lot of data.\nAlso you only need to call create_platform_endpoint() once, storing the result ARN.  Watch out for a change to the device token.  If it does, you'll need to contact your server and notify it that it's changed and call create_platform_endpoint() again.  I've never actually seen this happen, however.","Q_Score":0,"Tags":"python,amazon-web-services,push-notification,amazon-sns","A_Id":46165313,"CreationDate":"2017-09-11T17:56:00.000","Title":"Storing endpoint ARN vs. Device Token at backend","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a small program with a command line interface that uses a number of python classes with thorough implementations.  I want to scrap the command line interface and wrap the app within a Django app, but I'm just learning Django and I'm unfamiliar with the conventions.\nI have a number of classes, in-memory storage structures, getters\/setters etc and I'd like to convert them into Django models so that I can persist them to the database and interact with them around the django app.  Is there a general approach for doing something like this?  \nShould I just inherit the django.db.models.Model class in my existing classes and set them up for direct interaction? Or is there a better, more general\/conventional way to do this?\nI would like to be able to use all of this code in other apps, not necesarilly Django ones, so I don't really want to modify my existing classes in a way that would make them only work with Django. I thought of creating the models separately and then a sort of middle-man class to manage interaction of the actual in-memory class with the django model class, but that just seems like more places I have to make changes when I extend\/modify the code.\nThanks for any help ahead of time...","AnswerCount":2,"Available Count":2,"Score":0.2913126125,"is_accepted":false,"ViewCount":386,"Q_Id":46164287,"Users Score":3,"Answer":"Personally, I would modify your existing classes to extend models.Model and maintain separate versions of these classes for use outside of Django.\nThis will keep your classes lean and maintainable within their respective environments.\nYou could also create a new class that extends both models.Model and your python model through multiple inheritance. However this will result in duplicate fields for the same data.\nIf you would like, post an example Model as a new question and tag me in a link to it here, and I can help you convert it.","Q_Score":0,"Tags":"python,django","A_Id":46164587,"CreationDate":"2017-09-11T20:58:00.000","Title":"Converting existing python classes into Django Models","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a small program with a command line interface that uses a number of python classes with thorough implementations.  I want to scrap the command line interface and wrap the app within a Django app, but I'm just learning Django and I'm unfamiliar with the conventions.\nI have a number of classes, in-memory storage structures, getters\/setters etc and I'd like to convert them into Django models so that I can persist them to the database and interact with them around the django app.  Is there a general approach for doing something like this?  \nShould I just inherit the django.db.models.Model class in my existing classes and set them up for direct interaction? Or is there a better, more general\/conventional way to do this?\nI would like to be able to use all of this code in other apps, not necesarilly Django ones, so I don't really want to modify my existing classes in a way that would make them only work with Django. I thought of creating the models separately and then a sort of middle-man class to manage interaction of the actual in-memory class with the django model class, but that just seems like more places I have to make changes when I extend\/modify the code.\nThanks for any help ahead of time...","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":386,"Q_Id":46164287,"Users Score":1,"Answer":"One of greatest django strengths is its ORM, if you want import i recommend you use it, and yes you would probably need rewrite the part that interacts with the database, but if you already have isolated this functions in a Models folder~classes, the modification won't be really hard\nAlthough in your case i would recommending checking out Tornado\/Aiohttp Since looks like you are just trying to create a interface for your functions","Q_Score":0,"Tags":"python,django","A_Id":46164518,"CreationDate":"2017-09-11T20:58:00.000","Title":"Converting existing python classes into Django Models","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to hide all products that are not checked.\nfor example:- I have a checkbox button in product.template model and i want to hide hide all those products that are unchecked.","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":846,"Q_Id":46173343,"Users Score":0,"Answer":"each and every model have active field , by default active=True, so you can create separate view which product not active. you can refer active field for reference","Q_Score":0,"Tags":"python,xml,odoo-9,odoo-10","A_Id":46175051,"CreationDate":"2017-09-12T09:55:00.000","Title":"Checkbox condition in odoo","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to hide all products that are not checked.\nfor example:- I have a checkbox button in product.template model and i want to hide hide all those products that are unchecked.","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":846,"Q_Id":46173343,"Users Score":0,"Answer":"You can archive products that you don't want to show particular product.","Q_Score":0,"Tags":"python,xml,odoo-9,odoo-10","A_Id":46176387,"CreationDate":"2017-09-12T09:55:00.000","Title":"Checkbox condition in odoo","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to connect to a PostgreSQL database on Google Cloud using SQLAlchemy. Making a connection to the database requires specifying a database URL of the form:  dialect+driver:\/\/username:password@host:port\/database\nI know what the dialect + driver is (postgresql), I know my username and password, and I know the database name. But I don't know how to find the host and port on the Google Cloud console. I've tried using the instance connection name, but that doesn't seem to work. Anyone know where I can find this info on Google Cloud?","AnswerCount":3,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":6507,"Q_Id":46178062,"Users Score":3,"Answer":"Hostname is the Public IP address.","Q_Score":3,"Tags":"python,postgresql,google-cloud-platform,google-cloud-storage,google-cloud-sql","A_Id":64040093,"CreationDate":"2017-09-12T13:42:00.000","Title":"What is the hostname for a Google Cloud PostgreSQL instance?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have used Beautiful Soup with great success when crawling single pages of a site, but I have a new project in which I have to check a large list of sites to see if they contain a mention or a link to my site. Therefore, I need to check the entire site of each site.\nWith BS I just don't know yet how to tell my scraper that it is done with a site, so I'm hitting recursion limits. Is that something Scrapy handles out of the box?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":344,"Q_Id":46183843,"Users Score":2,"Answer":"Scrapy uses a link follower to traverse through a site, until the list of available links is gone.  Once a page is visited, it's removed from the list and Scrapy makes sure that link is not visited again.\nAssuming all the websites pages have links on other pages, Scrapy would be able to visit every page of a website. \nI've used Scrapy to traverse thousands of websites, mainly small businesses, and have had no problems.  It's able to walk through the whole site.","Q_Score":1,"Tags":"python,web-scraping,beautifulsoup,scrapy","A_Id":46185425,"CreationDate":"2017-09-12T19:15:00.000","Title":"Does Scrapy 'know' when it has crawled an entire site?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In local system elastic search works perfectly but when i'm trying to search in server system it shows in console : \"ConnectionTimeout caused by - ReadTimeoutError(HTTPConnectionPool(host=u'localhost', port=9200): Read timed out. (read timeout=10))\"","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":3169,"Q_Id":46188842,"Users Score":0,"Answer":"It appears that the localhost value you are trying to connect to is a Unicode string host=u'localhost. Not sure how you are getting\/assigning that value into a variable, but you should try to encode\/convert it to ASCII so that it can be properly interpreted during the HTTP connection routine.","Q_Score":0,"Tags":"python,django,elasticsearch","A_Id":46230007,"CreationDate":"2017-09-13T04:25:00.000","Title":"ConnectionTimeout caused by - ReadTimeoutError(HTTPConnectionPool(host=u'localhost', port=9200): Read timed out. (read timeout=10))","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I want to automate the python manage.py makemigrations as in if a user encounters Did you rename game.last to game.las (a CharField)? [y\/N] then the input will always be y but if the user encounters You are trying to add a non-nullable field 'las' to game without a default then it will automatically and continuously enter 1.\nI tried yes | python manage.py makemigrations as researched however this will just throw an infinite loop of Please select a valid option if the default input is asked\nMy desire is the automation between 1 and y value as mentioned on my first paragraph or just throw an error if I input a wrong option on the default input","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":481,"Q_Id":46190589,"Users Score":0,"Answer":"I actually solved the problem via timeouts like timeout 30 yes | python manage.py makemigrations so if in case an infinite loop via wrong option selection on non-nullable field input returns. It will automatically exit after 30 seconds. Giving me an alternative somehow to proceed my CI\/CD without pushing my migrations","Q_Score":0,"Tags":"python,linux,django","A_Id":46199931,"CreationDate":"2017-09-13T06:44:00.000","Title":"Automated answer in django's makemigrations","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to automate the python manage.py makemigrations as in if a user encounters Did you rename game.last to game.las (a CharField)? [y\/N] then the input will always be y but if the user encounters You are trying to add a non-nullable field 'las' to game without a default then it will automatically and continuously enter 1.\nI tried yes | python manage.py makemigrations as researched however this will just throw an infinite loop of Please select a valid option if the default input is asked\nMy desire is the automation between 1 and y value as mentioned on my first paragraph or just throw an error if I input a wrong option on the default input","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":481,"Q_Id":46190589,"Users Score":1,"Answer":"First, run manage.py makemigrations locally. It makes a script to modify the database schema and that is part of development and places it in the project\/migrations directory. Build the container such that the generated migrations are included in your Docker container (they should be automatically as they are part of the Django project source tree), and run manage.py migrate --noinput on start-up of the container. It will automatically apply any migrations that haven't been applied. Your migrations build up over time but you can squash them if you REALLY need to, I would recommend against it except rare circumstances.\nThis way, you will keep your development and production database schema in sync, and won't run into strange bugs because you generated new migrations on production that didn't exist in your development environment.\nI would recommend purposefully designing your migrations so that they don't require any input on manage.py migrate. That is not always possible, for instance, stale models will sometimes require input and just be left there unless manually deleted.\nSince all of the Django source is available to you, it's trivial to make a version of the migrate command that assumes y and place it as a management command. Then run that management command instead of migrate, done.\nI would show an example of this but it is specific to the version of Django you are running.","Q_Score":0,"Tags":"python,linux,django","A_Id":54245154,"CreationDate":"2017-09-13T06:44:00.000","Title":"Automated answer in django's makemigrations","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using django to create a blog. In my model I am using a text field for my blog content. But I am unable to insert any image or a clickable link. How to add links(clickable) and insert images?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":814,"Q_Id":46194582,"Users Score":0,"Answer":"there is no thing like clickable link in Database.you can put link as text and while importing it to your HTML use , and for Images there are two options. either you put your image path name in database or change TextField in models to FileField.","Q_Score":0,"Tags":"python,django,django-models,django-admin","A_Id":46196573,"CreationDate":"2017-09-13T10:03:00.000","Title":"how to add links and images in text field of django admin","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've installed PyCharm with the robotframework support plugin.\nThe .robot files are identified successfully and I was able to create a simple script and run it in pyCharm.\nHowever, my problem is that no keywords nor even the robotframework libraries (selenium2library) are recognized by pycharm in order to be autocompleted when typing them.\nI also have the intellibot plugin installed.\nIs there something that I'm missing? Is there another configuration file somewhere?\nThanks,","AnswerCount":9,"Available Count":5,"Score":1.2,"is_accepted":true,"ViewCount":11370,"Q_Id":46196953,"Users Score":3,"Answer":"Try to set up your Library to robotframework-selenium2library == 1.8.0, then the issue will disappear. \nIf you have the last version it doesn't work for me.","Q_Score":1,"Tags":"python,selenium,robotframework","A_Id":46242993,"CreationDate":"2017-09-13T11:58:00.000","Title":"Robot Framework with Pycharm -- Autocomplete doesn't work","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've installed PyCharm with the robotframework support plugin.\nThe .robot files are identified successfully and I was able to create a simple script and run it in pyCharm.\nHowever, my problem is that no keywords nor even the robotframework libraries (selenium2library) are recognized by pycharm in order to be autocompleted when typing them.\nI also have the intellibot plugin installed.\nIs there something that I'm missing? Is there another configuration file somewhere?\nThanks,","AnswerCount":9,"Available Count":5,"Score":0.022218565,"is_accepted":false,"ViewCount":11370,"Q_Id":46196953,"Users Score":1,"Answer":"You can try install \"Robot Framework support\" plugin.\nit working for me.","Q_Score":1,"Tags":"python,selenium,robotframework","A_Id":61906962,"CreationDate":"2017-09-13T11:58:00.000","Title":"Robot Framework with Pycharm -- Autocomplete doesn't work","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've installed PyCharm with the robotframework support plugin.\nThe .robot files are identified successfully and I was able to create a simple script and run it in pyCharm.\nHowever, my problem is that no keywords nor even the robotframework libraries (selenium2library) are recognized by pycharm in order to be autocompleted when typing them.\nI also have the intellibot plugin installed.\nIs there something that I'm missing? Is there another configuration file somewhere?\nThanks,","AnswerCount":9,"Available Count":5,"Score":0.022218565,"is_accepted":false,"ViewCount":11370,"Q_Id":46196953,"Users Score":1,"Answer":"There is a bug in the intellibot plugin.\nTo resolve you need to \n1. Uninstall your current intellibot plugin \n2. Search for \"IntelliBot @SeleniumLibrary Patched\" in the plugins repository.\n3. Install this patched plugin.\nThis worked for me.","Q_Score":1,"Tags":"python,selenium,robotframework","A_Id":54354095,"CreationDate":"2017-09-13T11:58:00.000","Title":"Robot Framework with Pycharm -- Autocomplete doesn't work","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've installed PyCharm with the robotframework support plugin.\nThe .robot files are identified successfully and I was able to create a simple script and run it in pyCharm.\nHowever, my problem is that no keywords nor even the robotframework libraries (selenium2library) are recognized by pycharm in order to be autocompleted when typing them.\nI also have the intellibot plugin installed.\nIs there something that I'm missing? Is there another configuration file somewhere?\nThanks,","AnswerCount":9,"Available Count":5,"Score":0.0444152037,"is_accepted":false,"ViewCount":11370,"Q_Id":46196953,"Users Score":2,"Answer":"My solution:\n\nUninstall the 'Robot framework support' (PyCharm\/File\/Settings\/Plugins)\nUninstall 'Intellibot' (PyCharm\/File\/Settings\/Plugins) (Uninstall all similar plugins!)\nExit PyCharm\nUninstall robotframework-seleniumlibrary (Open command prompt with administration mode: pip uninstall robotframework-seleniumlibrary)\nInstall robotframework-seleniumlibrary 3.3.1 (Command prompt: pip install robotframework-seleniumlibrary==3.3.1)\nOpen PyCharm\nInstall 'IntelliBot @SeleniumLibrary Patched' (PyCharm\/File\/Settings\/Plugins)\n\n(If it isn't working then try the following: PyCharm\/File\/Invalidate Caches\/Restart... and click the 'Invalidate and Restart')","Q_Score":1,"Tags":"python,selenium,robotframework","A_Id":63884543,"CreationDate":"2017-09-13T11:58:00.000","Title":"Robot Framework with Pycharm -- Autocomplete doesn't work","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've installed PyCharm with the robotframework support plugin.\nThe .robot files are identified successfully and I was able to create a simple script and run it in pyCharm.\nHowever, my problem is that no keywords nor even the robotframework libraries (selenium2library) are recognized by pycharm in order to be autocompleted when typing them.\nI also have the intellibot plugin installed.\nIs there something that I'm missing? Is there another configuration file somewhere?\nThanks,","AnswerCount":9,"Available Count":5,"Score":0.0,"is_accepted":false,"ViewCount":11370,"Q_Id":46196953,"Users Score":0,"Answer":"use plugin Intellbot@SeleniumLibrary Patched\nand robotframework-seleniumlibrary version 3.3.1\nIt works for me after lot of research from the internet","Q_Score":1,"Tags":"python,selenium,robotframework","A_Id":62624002,"CreationDate":"2017-09-13T11:58:00.000","Title":"Robot Framework with Pycharm -- Autocomplete doesn't work","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to do some python based web scraping where execution time is pretty critical.\nI've tried phantomjs, selenium, and pyqt4 now, and all three libraries have given me similar response times. I'd post example code, but my problem affects all three, so I believe the problem either lies in a shared dependency or outside of my code. At around 50 concurrent requests, we see a huge desegregation in response time. It takes about 40 seconds to get back all 50 pages, and that time gets exponentially slower with greater page demands. Ideally I'm looking for ~200+ requests in about 10 seconds. I used multiprocessing to spawn each instance of phantonjs\/pyqt4\/selenium, so each url request gets it's own instance so that I'm not blocked by single threading.\nI don't believe it's a hardware bottleneck, it's running on 32 dedicated cpu cores, totaling to 64 threads, and cpu usage doesn't typically spike to over 10-12%. Bandwidth as well sits reasonably comfortably at around 40-50% of my total throughput.\nI've read about the GIL, which I believe I've addressed with using multiprocessing. Is webscraping just an inherently slow thing? Should I stop expecting to pull 200ish webpages in ~10 seconds?\nMy overall question is, what is the best approach to high performance web scraping, where evaluating js on the webpage is a requirement?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":598,"Q_Id":46205279,"Users Score":1,"Answer":"\"evaluating js on the webpage is a requirement\" <- I think this is your problem right here.  Simply downloading 50 web pages is fairly trivially parallelized and should only take as long as the slowest server takes to respond.\nNow, spawning 50 javascript engines in parallel (which is essentially what I guess it is you are doing) to run the scripts on every page is a different matter. Imagine firing up 50 chrome browsers at the same time.\nAnyway: profile and measure the parts of your application to find where the bottleneck lies.  Only then you can see if you're dealing with an I\/O bottleneck (sounds unlikely), a CPU bottleneck (more likely) or a global lock somewhere that serializes stuff (also likely but impossible to say without any code posted)","Q_Score":0,"Tags":"python,multithreading,web-scraping,multiprocessing","A_Id":46205430,"CreationDate":"2017-09-13T19:17:00.000","Title":"Python & web scraping performance","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Hello all I am working on a Django project with backend database as a PostgreSQL server. and I have chosen elastic search as a search engine for my project.\nI have used elastic search-dsl-py to create a mapping between Django models and elastic search doc type. and use Django signals to capture  update and delete events.\nBy the way, I haven't mapped all the fields from Django model to elastic search. \nWhen a user search to  he\/she get's a list of an item to homepage from elastic search server. When user clicks to the item list. Where should I query the detail data of an item, in the elastic_search server or in the Postgres server \nIf I put all the details of every object in an elastic server, It will going to be a pain for me as, there is a nested relation in Django models. \nIf I don't put all the details in elastic search server, I need to query to the database, to get the detail of an item which is going to be slow as compared to an elastic search query.\nWhich approach should I go?\nIndex all the properties along with the nested relation in elastic search server and do all the querying operation to elastic search.\nOR \nIndex only the necessary field in elastic search server, and for the detail view, do q query to the database with the required field id.\nDoes anyone have this kind of experience before?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":296,"Q_Id":46210040,"Users Score":2,"Answer":"This decision really depends on what you are trying to address with elastic search. \nRecently I worked on a project that used elastic search. The reason was to speed up searching and to provide better search result. However the detail of selected product is queried from the database (mssql). \nThe decision to map all or few fields depends on what you wanted out of elastic search.If its for better search result (result + speed) then I suggest you only map those fields that help user for searching.","Q_Score":1,"Tags":"python,django,elasticsearch,django-models,django-signals","A_Id":46210212,"CreationDate":"2017-09-14T03:27:00.000","Title":"indexing db content to elastic search","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Has anyone found out a way to have visual studio run a Django app on a static port rather than it changing ports every run? I have a separate program sending requests to the server but it becomes a hassle having to change the port every time I re run the server.\nThanks in advance for any direction on the subject.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":912,"Q_Id":46210226,"Users Score":3,"Answer":"At Solution Properties -> Debug Tab\nIn the Run Section, change Launch URL with the IP value and port that you need.\ne.g: http\/\/localhost:5555","Q_Score":0,"Tags":"python,django,visual-studio","A_Id":47166877,"CreationDate":"2017-09-14T03:50:00.000","Title":"Static Ports In Django w\/ Visual Studio","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We are using RIDE IDE and are trying to integrate TestRail and JIRA. We have downloaded the TestRail API python file (testrail.py), but we are not able to import it in our project in RIDE.\nCan we know how to implement the same.\nIs there any steps or tutorial video for integrating TestRail and JIRA in RIDE ?\nWe are using RIDE 1.5.2.1 running on Python 2.7.12\nThanks","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":1211,"Q_Id":46214501,"Users Score":1,"Answer":"If you want to use a python library in a robot test, you will need to create your own library that provides keywords that use the library. You can't just import any random python library and expect it to work like a robot keyword library.","Q_Score":0,"Tags":"python,jira,robotframework,testrail,robotframework-ide","A_Id":46220408,"CreationDate":"2017-09-14T08:47:00.000","Title":"TestRail and JIRA integration with Robot Framework (RIDE IDE)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"When use .\\curl.exe -v -H 'HTTP_TEST:A17041708' http:\/\/127.0.0.1:8000\/api\/test\nopen the url. \nI print the request.META,but i can't find my custom header in it","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":590,"Q_Id":46216147,"Users Score":0,"Answer":"The fields you define will be prefixed with HTTP.","Q_Score":2,"Tags":"python,django","A_Id":46231942,"CreationDate":"2017-09-14T10:02:00.000","Title":"Why I can't get the custom header from Django request.META","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to extract reviews from public facebook pages like airline page, hospital page, to perform sentiment analysis. I have app id and app secret id which i generated from facebook graph API using my facebook account, But to extract the reviews I need page access token and as I am not the owner\/admin of the page so I can not generate that page access token. Is any one know how to do it or it requires some paid service? \nKindly help.\nThanks in advance.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":259,"Q_Id":46252155,"Users Score":1,"Answer":"Without a Page Token of the Page, it is impossible to get the reviews\/ratings. You can only get those for Pages you own. There is no paid service either, you can only ask the Page owners to give you access.","Q_Score":0,"Tags":"r,python-2.7,facebook-graph-api","A_Id":46254610,"CreationDate":"2017-09-16T09:07:00.000","Title":"How to extract reviews from facebook public page without page access token?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"It is necessary to make a static application that uses a constant connection to the server to receive messages or updates the page in a period of time. With Django, python 2.7 and without js and jquery.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":49,"Q_Id":46254811,"Users Score":0,"Answer":"Just immediately do a page refresh by adding <meta http-equiv=\"refresh\" content=\"0\"> to the  of your page. Then sleep instead of responding until you actually want to update the page.\nThats still a shitty hack and you should propably reconsider your design. Client-Side Updates and no JS doesn't mix.","Q_Score":0,"Tags":"django,python-2.7,static,connection","A_Id":46255626,"CreationDate":"2017-09-16T14:11:00.000","Title":"How to update a client-side page without js and jquery on django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on creating a Django web app using resources on AWS. I am new to deployment and in my production setup (Elastic Beanstalk i.e. ELB based) I would like to move away from the Django development web server and instead use Nginx + Gunicorn. I have been reading about them and also about ELB.\nIs Nginx + Gunicorn needed if I deploy my Django app on ELB? As ELB does come with reverse proxy, auto scaling, load balancing etc.\nAppreciate the inputs.","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":5381,"Q_Id":46259836,"Users Score":2,"Answer":"You definitely still need some reverse proxy on your application level. While ELB has no specific reverse proxy, Application Load Balancer (ALB)  would kind of replace need of proper reverse proxy as it allows to define path-based routing. Nevertheless it's not a full substitute of nginx in this case. With nginx you are equipped with tools that which allows you to do almost unlimited things that may be required by your application as it keeps on growing up when the serious traffic comes into play.\nWhat's more, for Django application on production you definitely want to run it with some uwsgi for example as it's capable of handling traffic any \"development\" server as the one shipped with django could not do. \nWith all the things described above, you're in position of charge here by having all those nginx and uwsgi stuff ready to go with your application.\nI love to have all applications we do on daily basis contenerized with Docker on EBS multi-container environment. There we've got nginx, uwsgi, so we can do anything we need.","Q_Score":4,"Tags":"django,amazon-web-services,nginx,python-3.4,gunicorn","A_Id":46266596,"CreationDate":"2017-09-17T01:21:00.000","Title":"AWS elastic beanstalk + Nginx + Gunicorn","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to look for a way to embed Python code inside an HTML page.\nI'm NOT talking about using Python as the back-end with tools like Django or Flask. I would like to implement a very very basic console on my webpage so that I can show off Python scripts running, not just pure code. The user would then be able to modify the python, then re-run it to see changes.\nSuppose I'm making a python programming tutorial website, and I want the user to see that print(\"hello world\"), when run, output \"hello world\".\nIs there a way to achieve this?","AnswerCount":4,"Available Count":1,"Score":-0.049958375,"is_accepted":false,"ViewCount":7680,"Q_Id":46267265,"Users Score":-1,"Answer":"Try trinket.io! Trinket lets you embed, share and save python code for free!","Q_Score":3,"Tags":"python,html","A_Id":68627124,"CreationDate":"2017-09-17T18:05:00.000","Title":"Embed Python in an HTML page","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to stop crawlers from indexing specific images on my website, but only if they're older than a specific date. However, the crawler shall not stop indexing the page where the image is currently linked.\nMy initial approach was to write a script which adds the URL of the image to 'robots.txt', but I think the file will become huge, as we talk about a really huge amount of potential images.\nMy next idea was to use the <meta name=\"robots\" content=\"noimageindex\"> tag, but I think this approach can be error prone, as I could forget to add this tag to a template where I might want to stop crawlers from indexing the image. It's also redundant and the crawler will ignore all images.\nMy question is: do you know a programmatically way to force a crawler too not index a image, if a condition (in my case the date) is true? Or is my only possibility to stop the crawler from indexing the whole page?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":66,"Q_Id":46275319,"Users Score":2,"Answer":"Building on top of what you had in mind, you could just create a separate place to keep the images that you don't want to be indexed, write a script to move files to that location once they're \"expired\" and just add the url to the the robots.txt file. Perhaps something like \/expired_images*.","Q_Score":0,"Tags":"python,html,django,seo","A_Id":46275441,"CreationDate":"2017-09-18T08:58:00.000","Title":"Is there a programmatically way to force a crawler to not index specific images?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"It should sound stupid. But here is my scenario. \nI have a python-flask website which is made live using nohup. Now even after i removed all files in __pycache__ and the original .py files the program is still running without any errors. So where does it run from ? Is there any cache of files getting created anywhere else?\nNote: I know i can kill the process but just wanted to know about this issue","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":113,"Q_Id":46277726,"Users Score":1,"Answer":"As long as one process has a file open, the file will remain available to that process. No other processes can open it, and its existence will not be visible with normal OS utilities, such as ls.\nIn the case of Python, I think that the compiled version of the script remains in memory. Removing it from the filesystem does nothing to change that.\nSo your flask app is not affected until it terminates, at which point the resident memory will be freed and any files that it held open will be removed by the OS.","Q_Score":0,"Tags":"python","A_Id":46277867,"CreationDate":"2017-09-18T11:02:00.000","Title":"Python program is running even after the files are removed","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"It should sound stupid. But here is my scenario. \nI have a python-flask website which is made live using nohup. Now even after i removed all files in __pycache__ and the original .py files the program is still running without any errors. So where does it run from ? Is there any cache of files getting created anywhere else?\nNote: I know i can kill the process but just wanted to know about this issue","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":113,"Q_Id":46277726,"Users Score":1,"Answer":"So where does it run from ?\n\nIt runs from memory. Once your program has been compiled to byte code (or the byte code has been loaded from .pyc files), it is shipped off for execution to the Python Virtual Machine and the original source file is closed. Removing it doesn't affect the running process.","Q_Score":0,"Tags":"python","A_Id":46277897,"CreationDate":"2017-09-18T11:02:00.000","Title":"Python program is running even after the files are removed","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Django-Storages provides an S3 file storage backend for Django.  It lists\nAWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY as required settings.  If I am using an AWS Instance Profile to provide S3 access instead of a key pair, how do I configure Django-Storages?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":1069,"Q_Id":46307447,"Users Score":1,"Answer":"The docs now explain this:\n\nIf AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY are not set, boto3 internally looks up IAM credentials.","Q_Score":3,"Tags":"django,amazon-s3,boto3,python-django-storages","A_Id":61942402,"CreationDate":"2017-09-19T18:28:00.000","Title":"Use Django-Storages with IAM Instance Profiles","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm new to Ubuntu, and also fairly new to web development, so I am hoping there is some obvious thing I am missing. \nMy problem is as follows: I have a box running Ubuntu 16.04 and I have my Django project with a virtualenv. With the virtualenv activated, I ran pip install opencv-python, and it seemed to work (all the files seem to be where I would think they need to be (env\/lib\/python3.5\/site-packages\/{cv2,numpy}).\nBut when I run manage.py, I get an error that traces back to __init__.py in the opencv package: \n\nImportError: libSM.so.6: cannot open shared object file: No such file or directory.\n\nI get the same error when I run python interactively in the virtualenv and try to import cv2.\nIs .cv2 in the error a namespace? Is there an way I can get more information or do a python search for the namespace?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":454,"Q_Id":46312129,"Users Score":2,"Answer":"Evert's comment was correct. I followed his steps and got a different, but similar, error. It turns out I had to install libxrender1.\nHere are the steps I used:\n\nactivate my virtual environment\nuninstall opencv-python\nsudo apt-get install libsm6\nreinstall opencv-python\nsudo apt-get install libxrender1","Q_Score":0,"Tags":"python,django,opencv,ubuntu,virtualenv","A_Id":46312773,"CreationDate":"2017-09-20T02:00:00.000","Title":"Ubuntu 16.04 Django 1.11.5 virtualenv opencv","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"i am new to serverless framework and aws, and i need to create a lambda function on python that will send email whenever an ec2 is shut down, but i really don't know how to do it using serverless. So please if any one could help me do that or at least give me some tracks to start with.","AnswerCount":3,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":203,"Q_Id":46322899,"Users Score":3,"Answer":"You can use CloudWatch for this.\nYou can create a cloudwatch rule\n\nService Name -  Ec2 \nEvent Type - EC2 Instance change notification\nSpecific state(s) - shutting-down\n\nThen use an SNS target to deliver email.","Q_Score":1,"Tags":"python,amazon-web-services,amazon-ec2,aws-lambda,serverless-framework","A_Id":46323508,"CreationDate":"2017-09-20T13:05:00.000","Title":"send email whenever ec2 is shut down using serverless","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Django project and I messed up with the src\/lib\/python folder (I know I shouldn't have but that's the case) and now I have missing files and folders. \nHow can I re-install the python folder in order to retrieve the missing files?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":26,"Q_Id":46326262,"Users Score":0,"Answer":"Apparently, according to @DanielRoseman recreating the virtualenv should fix the problem.","Q_Score":0,"Tags":"python,django","A_Id":46329111,"CreationDate":"2017-09-20T15:34:00.000","Title":"Re-install src\/lib\/python folder in a Django project","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Currently we have developed an API using Flask that works in a traditional request-response style (client is a mobile application). This API is hosted using Apache on the remote server. What we would like to do is integrate the real-time connections between server and client (just like a chat app). This is where I got stuck. I need to make choice for the framework here. Using Tornado with Flask will not be a good choice since Tornado is non-blocking but Flask is blocking. What would be the best choice in this case?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":68,"Q_Id":46344722,"Users Score":2,"Answer":"I think today's default solution to provide realtime capabilities for web applications are websockets (Please google Flask+websockets). If concurrency is an issue (i.e. many long-lasting, simultaneous connections), the \"chain\" of software handling the websockets should be non-blocking (otherwise many threads will eat up your resources while doing nothing). You can continue to use flask, as it supports gevent (a non-blocking monkey-patch for the Python stdlib), but your are probably better off with nginx than Apache as the reverse proxy since it has always been non-blocking. For example, nginx+gevent+flask would provide you a nonblocking setup.\nPersonally, I like Tornado a lot, but I would be reluctant to introduce another framework into your application if you already went a long way with Flask.","Q_Score":0,"Tags":"python,flask","A_Id":46345733,"CreationDate":"2017-09-21T13:04:00.000","Title":"What would be the best choice for integrating a real-time connection in flask API?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a test case where I am iterating using a FOR loop, where the variable in the loop is \"j\". \nI am then using this \"j\" in a user-defined keyword, but the test case fails and the error is \"Variable j not found\".\nThis exact same test case works on another machine without any error, and I'm not sure why. In my machine where it fails, there is no problem with libraries or the setup, and this variable is not being saved anywhere.\nCould someone please suggest why this could happen?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":1010,"Q_Id":46350778,"Users Score":2,"Answer":"You can give variable \"j\" with symbol @","Q_Score":0,"Tags":"python-2.7,testing,automation,automated-tests,robotframework","A_Id":72298130,"CreationDate":"2017-09-21T18:21:00.000","Title":"Variable not found in Robot Framework-RIDE","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"What is the explicit and clear disadvantages of using ASGI instead of WSGI for HTTP request handling in Django in general?\nI know ASGI is for asynchronous tasks, but it can also handle synchronous HTTP requests via http.* channels. Is it slower than normal WSGI or is there any unsupported features comparing to WSGI?\nOne more, to provide both REST API and websocket handling in same project, which way do you prefer and why?\n\nWSGI for REST + ASGI for websocket in different server instances\nWSGI for REST + ASGI for websocket in same machine\nASGI for both","AnswerCount":2,"Available Count":2,"Score":1.0,"is_accepted":false,"ViewCount":26075,"Q_Id":46386596,"Users Score":18,"Answer":"I think the one major downside you will find is that the ASGI servers are newer and therefore tested less, may have less features, fewer in number, and probably have a smaller community behind them. However, I use an ASGI server (Daphne) for everything and feel that websockets offer so much in terms of user experience that everything will eventually shift to ASGI.\nBeing able to use asyncio in your code is a major benefit for web programming. Instead of running 10 queries one after the other and waiting for each one to come back, you can run 10 queries at the same time, while hitting your cache and making a HTTP request simultaneously on a single thread.","Q_Score":30,"Tags":"python,django,django-channels","A_Id":53784973,"CreationDate":"2017-09-24T04:28:00.000","Title":"Disadvantages of using ASGI instead of WSGI","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"What is the explicit and clear disadvantages of using ASGI instead of WSGI for HTTP request handling in Django in general?\nI know ASGI is for asynchronous tasks, but it can also handle synchronous HTTP requests via http.* channels. Is it slower than normal WSGI or is there any unsupported features comparing to WSGI?\nOne more, to provide both REST API and websocket handling in same project, which way do you prefer and why?\n\nWSGI for REST + ASGI for websocket in different server instances\nWSGI for REST + ASGI for websocket in same machine\nASGI for both","AnswerCount":2,"Available Count":2,"Score":1.0,"is_accepted":false,"ViewCount":26075,"Q_Id":46386596,"Users Score":9,"Answer":"I didn't do any benchmarking but use both WSGI and ASGI in several project and didn't see any sufficient differences between their performance, so if the Django WSGI performance is acceptable for you then ASGI will work too.\nFor the REST + websockets API I used ASGI for both. There is no reason to use WSGI if you have ASGI enabled in your project (WSGI works over ASGI).","Q_Score":30,"Tags":"python,django,django-channels","A_Id":49812130,"CreationDate":"2017-09-24T04:28:00.000","Title":"Disadvantages of using ASGI instead of WSGI","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a python script that scrapes data from different websites then writes some data into CSV files.\nI run this every day from my local computer but I would like to make this automatically running on a server and possibly for free.\nI tried PythonAnywhere but it looks that their whitelist stops me from scraping bloomberg.com.\nI then passed to Heroku, I deployed my worker (the python script). Everything seems to work but looking with Heroku bash to the directory where the python script is supposed to write the CSV files nothing appears.\nI also realised that I have no idea of how I would download those CSV files in case those were written.\nI am wondering if I can actually achieve what I am trying to achieve with Heroku or if the only way to get a python script to work on a server is by paying for PythonAnywhere and avoid scraping restriction?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":484,"Q_Id":46390149,"Users Score":1,"Answer":"Heroku's filesystem is per-dyno and ephemeral. You must not save things to it for later use.\nOne alternative is to write it to somewhere permanent, such as Amazon S3. You can use the boto library for this. Although you do have to pay for S3 storage and data, it's very inexpensive.","Q_Score":0,"Tags":"python,csv,heroku,web-scraping,download","A_Id":46390214,"CreationDate":"2017-09-24T12:42:00.000","Title":"Can I use Heroku to Scrape Data to later Download?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a strange problem at my iphone, \nwhen  I remove the mdm profile, \nthe camera always be disabled, it's not come back , the mdm profile is only one , how to reset it?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":27,"Q_Id":46397244,"Users Score":0,"Answer":"Did you remove the Profile from the Device settings or through the Apple Configurator?\nMany times even if you remove profile from Device settings, its still there in the Device.\nYou can see if its still there in the Device using Apple Configurator and try removing it from there.","Q_Score":0,"Tags":"python,iphone,mdm","A_Id":46548859,"CreationDate":"2017-09-25T03:36:00.000","Title":"remove the profile but the camera always be disabled","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Lets say I have a model called Thingy, and there are 20 Thingies in my database. When I retrieve all Thingies, serializer.to_represenatation() is executed 20 times. This is good.\nHowever, when I retrieve just a single Thingy from \/api\/thingies\/1, I observe that serializer.to_representation() is executed four (4!!!) times.\nWhy does this happen, and how can I get away with just one call to to_representation()?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":229,"Q_Id":46421437,"Users Score":3,"Answer":"That's because you are using the browsable API.\nJSON renderer will only call it once.\nBrowsable API needs several calls:\n\nfor the result itself\nfor the raw data tab when you can modify a resource through PUT\nfor the raw data tab when you can modify a resource through PATCH\nfor the HTML form tab","Q_Score":0,"Tags":"django,python-3.x,django-rest-framework,django-serializer","A_Id":46424881,"CreationDate":"2017-09-26T08:29:00.000","Title":"Why does retrieving a single resource execute serializer.to_representation() multiple times in Django REST framework?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Odoo10 \/ Windows\nI installed a module \"my_app\" in Odoo10, and want to change the model : app_model.py following this steps :\n\nadd field to app_model.py and save it\nrestart the odoo server form windows \"services\"\nActivate developper mode\nUpdate the application list\nUpgrade the application\n\nThe problem is that when i open my app model in the configuration menu=>Database structure=>models , the added field doesn't appear\nI tried to uninstall the app (to install it later with the new model), but Odoo didn't remove the app_model from the list of models (after app list update, restart service and even retart the server).\ndid i miss something ?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":554,"Q_Id":46425678,"Users Score":0,"Answer":"I finally found the problem, it was due to an Indentation error.\nWhen i added the field, i used linebreak in the editor, so it was at the same level of the other fields. But the editor used automatically tab when the other fields were indented with spaces.\nIt was that simple, but gave me a headache.","Q_Score":0,"Tags":"python-2.7,odoo-10","A_Id":46458232,"CreationDate":"2017-09-26T11:46:00.000","Title":"Odoo10 not updating model","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Currently we have our production Django web app hosted in IIS and we have noticed that when we add new changes into the views.py or, specially, the url.py files, the changes take a while to be reflected in the server, that is, it can take an hour to see the changes. This does not happen when I modify the html files, changes take effect immediately. \nWe also broke on purpose the url.py file by adding incorrect lines such as url1234567(r'^tickets\/$', views.tickets_calculate), but this line did not take effect until several minutes later. \nQuestions\n\nWhy do the changes in these files take so long? \nHow can I speed up this process of \"refreshing of views.py and urls.py?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":103,"Q_Id":46453761,"Users Score":0,"Answer":"After doing some trial and error tests we found out the following:\nFor question 1, it seems that this is not an isolated problem because in other web server applications such as Apache, IIS or nginx, the time it takes for pages to be reflected depends on the default parameters that are established by these web server applications. How to modify these parameters? This is an off-topic question and more research should be devoted to solve it. \nFor question 2, we did not find where to modify these parameters of \"refreshing\" time in IIS so the alternative solution was to run our Django web app in localhost inside of our server with python manage.py runserver and we started noticing the effects immediately for debugging purposes.","Q_Score":2,"Tags":"django,python-3.x,iis","A_Id":46498424,"CreationDate":"2017-09-27T17:20:00.000","Title":"How to speed up Django when doing new changes to the views.py and urls.py?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Currently we have our production Django web app hosted in IIS and we have noticed that when we add new changes into the views.py or, specially, the url.py files, the changes take a while to be reflected in the server, that is, it can take an hour to see the changes. This does not happen when I modify the html files, changes take effect immediately. \nWe also broke on purpose the url.py file by adding incorrect lines such as url1234567(r'^tickets\/$', views.tickets_calculate), but this line did not take effect until several minutes later. \nQuestions\n\nWhy do the changes in these files take so long? \nHow can I speed up this process of \"refreshing of views.py and urls.py?","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":103,"Q_Id":46453761,"Users Score":1,"Answer":"Old question, but consider: sudo \/etc\/init.d\/apache2 graceful to restart the webserver just after pulling the changes.","Q_Score":2,"Tags":"django,python-3.x,iis","A_Id":53764817,"CreationDate":"2017-09-27T17:20:00.000","Title":"How to speed up Django when doing new changes to the views.py and urls.py?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Scrapy seems to complete without processing all the requests. I know this because i am logging before and after queueing the request and I can clearly see that.\nI am logging in both parse and error callback methods and none of them got called for those missing requests.\nHow can I debug what happened to those requests?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":43,"Q_Id":46466345,"Users Score":0,"Answer":"You need to add dont_filter=True when re-queueing the request. Though the request may not match other request but Scrapy remembers what requests it has already made and it will filter out if you re-queue it. It will assume it was by mistake.","Q_Score":0,"Tags":"scrapy,python-3.5,scrapy-spider","A_Id":46466842,"CreationDate":"2017-09-28T10:01:00.000","Title":"requests disappear after queueing in scrapy","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Whats the best way to handle invalid parameters passed in with a GET or POST request in Flask+Python?\nLet's say for the sake of argument I handle a GET request using Flask+Python that requires a parameter that needs to be an integer but the client supplies it as a value that cannot be interpreted as an integer.  So, obviously, an exception will be thrown when I try to convert that parameter to an integer.\nMy question is should I let that exception propagate, thus letting Flask do it's default thing of returning an HTTP status code of 500 back to the client?  Or should I handle it and return a proper (IMO) status code of 400 back to the client?\nThe first option is the easier of the two.  The downside is that the resulting error isn't clear as to whose at fault here.  A system admin might look at the logs and not knowing anything about Python or Flask might conclude that there's a bug in the code.  However, if I return a 400 then it becomes more clear that the problem might be on the client's end.\nWhat do most people do in these situations?","AnswerCount":3,"Available Count":2,"Score":0.0665680765,"is_accepted":false,"ViewCount":1882,"Q_Id":46488989,"Users Score":1,"Answer":"If you look at most of the REST APIs, they will return 400 and appropriate error message back to the client if the user sends request parameters of a different type than is expected.\nSo, you should go with your 2nd option.","Q_Score":1,"Tags":"python,flask","A_Id":46489288,"CreationDate":"2017-09-29T12:36:00.000","Title":"Best way to handle invalid GET\/POST request parameters with Flask+Python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Whats the best way to handle invalid parameters passed in with a GET or POST request in Flask+Python?\nLet's say for the sake of argument I handle a GET request using Flask+Python that requires a parameter that needs to be an integer but the client supplies it as a value that cannot be interpreted as an integer.  So, obviously, an exception will be thrown when I try to convert that parameter to an integer.\nMy question is should I let that exception propagate, thus letting Flask do it's default thing of returning an HTTP status code of 500 back to the client?  Or should I handle it and return a proper (IMO) status code of 400 back to the client?\nThe first option is the easier of the two.  The downside is that the resulting error isn't clear as to whose at fault here.  A system admin might look at the logs and not knowing anything about Python or Flask might conclude that there's a bug in the code.  However, if I return a 400 then it becomes more clear that the problem might be on the client's end.\nWhat do most people do in these situations?","AnswerCount":3,"Available Count":2,"Score":0.0665680765,"is_accepted":false,"ViewCount":1882,"Q_Id":46488989,"Users Score":1,"Answer":"A status code of 400 means you tell the client \"hey, you've messed up, don't try that again\". A status code of 500 means you tell the client \"hey, I've messed up, feel free to try again later when I've fixed that bug\".\nIn your case, you should return a 400 since the party that is at fault is the client.","Q_Score":1,"Tags":"python,flask","A_Id":46489291,"CreationDate":"2017-09-29T12:36:00.000","Title":"Best way to handle invalid GET\/POST request parameters with Flask+Python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm looking to create an AWS system with one master EC2 instance which can create other instances. \nFor now, I managed to create python files with boto able to create ec2 instances.\nThe script works fine in my computer environment but when I try to deploy it using Amazon BeanStalk with Django (Python 3.4 included) the script doesn't work. I can't configure aws cli (and so Boto) through SSL because the only user I can access is ec2-user and the web server uses another user. \nI could simply handwrite my access ID key and password on the python file but that would not be secure. What can I do to solve this problem? \nI also discovered AWS cloudformation today, is it a better idea to create new instances with that rather than with the boto function run?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":161,"Q_Id":46493886,"Users Score":1,"Answer":"This sounds like an AWS credentials question, not specifically a \"create ec2 instances\" question. The answer is to assign the appropriate AWS permissions to the EC2 instance via an IAM role. Then your boto\/boto3 code and\/or the AWS CLI running on that instance will have permissions to make the necessary AWS API calls without having an access key and secret key stored in your code.","Q_Score":0,"Tags":"python,amazon-web-services,amazon-ec2,boto,aws-cli","A_Id":46494159,"CreationDate":"2017-09-29T17:15:00.000","Title":"How to create ec2 instances from another instance? boto awscli","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Django raises\n\ndjango.urls.exceptions.NoReverseMatch: 'en-us' is not a registered namespace\n\nHow i can fix it?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2378,"Q_Id":46495000,"Users Score":0,"Answer":"NoReverseMatch error has to do with urls so check your url patterns \nurl(...). \nmake sure your django version is 1.11 if not try to update it to 1.11","Q_Score":2,"Tags":"python,django","A_Id":46495157,"CreationDate":"2017-09-29T18:32:00.000","Title":"Django raises NoReverseMatch: 'en-us' is not a registered namespace","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have two databases in odoo DB1 and DB2. I made some changes to existing modules(say module1 and module2) in DB1 through GUI(web client). All those changes were stored to DB1 and were working correctly when I am logged in through DB1.\nNow, I made some changes in few files(in same two modules module1 and module2). These modules need to be upgraded in order to load those changes. So, i logged in from DB2 and upgraded those modules. My changes in file loaded correctly and were working correctly when I am logged in through DB2.\nBut those file changes were loaded only for DB2 and not for DB1.\nSo, I wanted to know:\n\nHow upgrading of a module works?? Does it upgrades only for the database through which the user is logged in and upgraded the module?\nAnd if it is so. Then, is there a way that I can Upgrade my module while retaining all the previous changes that i made through the GUI in that same module?\nWhat are the things that are changed when a module is upgraded?","AnswerCount":2,"Available Count":2,"Score":0.2913126125,"is_accepted":false,"ViewCount":1295,"Q_Id":46500405,"Users Score":3,"Answer":"you can restart the server and start the server by python odoo-bin -d database_name -u module_name\nor -u all to update all module","Q_Score":4,"Tags":"python,openerp,odoo-9,odoo-10","A_Id":46501313,"CreationDate":"2017-09-30T07:04:00.000","Title":"How upgrading of a Odoo module works?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have two databases in odoo DB1 and DB2. I made some changes to existing modules(say module1 and module2) in DB1 through GUI(web client). All those changes were stored to DB1 and were working correctly when I am logged in through DB1.\nNow, I made some changes in few files(in same two modules module1 and module2). These modules need to be upgraded in order to load those changes. So, i logged in from DB2 and upgraded those modules. My changes in file loaded correctly and were working correctly when I am logged in through DB2.\nBut those file changes were loaded only for DB2 and not for DB1.\nSo, I wanted to know:\n\nHow upgrading of a module works?? Does it upgrades only for the database through which the user is logged in and upgraded the module?\nAnd if it is so. Then, is there a way that I can Upgrade my module while retaining all the previous changes that i made through the GUI in that same module?\nWhat are the things that are changed when a module is upgraded?","AnswerCount":2,"Available Count":2,"Score":0.3799489623,"is_accepted":false,"ViewCount":1295,"Q_Id":46500405,"Users Score":4,"Answer":"There is 2 step for upgrading an addons in Odoo,\nFirst, restarting the service. it will upgrade your .py files.\nSecond, click upgrade button in Apps>youraddonsname. it will upgrade your .xml files.\ni create a script for upgrading the XML files. the name is upgrade.sh\n#!\/bin\/sh\nfor db in $(cat \/opt\/odoo\/scripts\/yourlistdbfiles);\ndo\nodoo --addons-path=\/opt\/odoo\/youraddonspath -d $db -u youraddonsname --no-xmlrpc > \/opt\/odoo\/logs\/yourlogfiles.log 2>&1 &\nsleep 20s && exit &\ndone\nso you just run sh \/opt\/odoo\/script\/upgrade.sh after editing your addons and no need to click the upgrade button anymore.\nhope this help","Q_Score":4,"Tags":"python,openerp,odoo-9,odoo-10","A_Id":46513745,"CreationDate":"2017-09-30T07:04:00.000","Title":"How upgrading of a Odoo module works?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am very new to coding and was trying to create a gui using appJar in atom.\nI followed the steps on the appJar website but whenever I run the code this is the message it gives:\n\nImportError: No module named appJar\n\nWhat do i do? Also am I using appJar correctly?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1639,"Q_Id":46501196,"Users Score":0,"Answer":"if you have windows you can open cmd and type pip install appjar or if you are using a IDE that has terminal it is not important which operating system you are using. just type pip install appjar in IDE terminal.","Q_Score":0,"Tags":"python,user-interface","A_Id":56342507,"CreationDate":"2017-09-30T08:51:00.000","Title":"ImportError: No module named appJar","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is there any way to run a function from python and a function from java in one app in parallel and get the result of each function to do another process?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":62,"Q_Id":46520136,"Users Score":2,"Answer":"There are at least three ways to achieve that.\na) You could use java.lang.Runtime (as in Runtime.getRuntime().exec(...)) to launch an external process (from Java side), the external process being your Python script.\nb) You could do the same as a), just using Python as launcher.\nc) You could use some Python-Java binding, and from Java side use a separate Thread to run your Python code.","Q_Score":0,"Tags":"java,python","A_Id":46520173,"CreationDate":"2017-10-02T05:51:00.000","Title":"Run two pieces of code from different programming language in parallel","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to open a page and get some data from it, using Requests and BeautifulSoup. How can I see the response of a requests.post in my browser as a page instead of the source code?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":987,"Q_Id":46528522,"Users Score":0,"Answer":"You need to learn about python GUI libraries like PyQt5 and instale it under your python libraries so that through QtWebEngineWidget and QWebView you can render your page to display it.","Q_Score":2,"Tags":"python-requests","A_Id":46528848,"CreationDate":"2017-10-02T15:19:00.000","Title":"python requests: show response in browser","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am relative new to developing web applications. \nI would like your comments and suggestions of improvement for the following architectural considerations.\nI have developed an expert system ES using CLIPS. Now I am planning to provide this to variety of users from our company as a web application. Before I start with going into greater details I am currently thinking about which technologies should be involved.\nThe goal is that the user of the web app is facing a chat-like animation which guides him to the final result while he or she provides more and more input to the ES. \nAfter conducting some research on my own I came up with the following idea\nIn the backend I use PyCLIPS as an Interface between Python and CLIPS\nThen I use DJANGO for integrating my python code into the web page dynamically altering the chat between user and ES.\nThere is one thing which is particularly still troubling me a lot: How shall I manage many concurrent users? Shall I use one ES with every user having an individual set of facts or shall every user have his or her own instance of the ES?\nDo you have any other high level approaches for this problem which could be superior to this one? \nI am looking forward to your experience and input regarding this matter. \nBest","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":371,"Q_Id":46531265,"Users Score":1,"Answer":"It is usually a good idea to split your Expert System into separate \"shards\". \nIt keeps the rule base simpler (as you don't need to distinguish to which user a fact is referring to) and allows you to scale horizontally when more users will be added.\nIf running one ES per user sounds overkill, you can decrease the granularity by sharding based on, for example, the first letter of the user surname or Id.\nWhen designing similar solutions I tend to de-couple the frontend application with the ES by using a queueing system. This allows you to modify the cluster layout without the need to change the public APIs.\n| Flask | ----> | RabbitMQ | ----> | ES Worker |\nIn case you want to change your sharding strategy, you can simply re-configure the broker queues layout without affecting the client\/end-user.","Q_Score":5,"Tags":"python,django,web-applications,python-multithreading,clips","A_Id":46542127,"CreationDate":"2017-10-02T18:12:00.000","Title":"Choice of architecture for exposing CLIPS expert system as web application","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm updating from an ancient language to Django. I want to keep the data from the old project into the new.\nBut old project is mySQL. And I'm currently using SQLite3 in dev mode. But read that postgreSQL is most capable. So first question is: Is it better to set up postgreSQL while in development. Or is it an easy transition to postgreSQL from SQLite3?\nAnd for the data in the old project. I am bumping up the table structure from the old mySQL structure. Since it got many relation db's. And this is handled internally with foreignkey and manytomany in SQLite3 (same in postgreSQL I guess).\nSo I'm thinking about how to transfer the data. It's not really much data. Maybe 3-5.000 rows.\nProblem is that I don't want to have same table structure. So a import would be a terrible idea. I want to have the sweet functionality provided by SQLite3\/postgreSQL.\nOne idea I had was to join all the data and create a nested json for each post. And then define into what table so the relations are kept.\nBut this is just my guessing. So I'm asking you if there is a proper way to do this?\nThanks!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":31,"Q_Id":46544518,"Users Score":0,"Answer":"better create the postgres database. write down the python script which take the data from the mysql database and import in postgres database.","Q_Score":0,"Tags":"python,django,database,postgresql,sqlite","A_Id":46544581,"CreationDate":"2017-10-03T12:22:00.000","Title":"Importing data from multiple related tables in mySQL to SQLite3 or postgreSQL","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a really basic django app to get weather.\nI need to get user's location to show them their current location's weather. I am using GeoIP for that.\nBut an issue has come up that GeoIP does not have information of all the IP addresses. It returns NoneType for those IP addresses.\nI want to know if there is any other precise way by which I can info about User's current latitude and longitude, like maybe browser API? It should not miss any User's location like GeoIP does.","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":1361,"Q_Id":46547897,"Users Score":2,"Answer":"First of all, You can NOT get exact location of user by IP.\nSome IPs of ISPs are not relevant with user location but with their IDC location.\nSo If you \"really\" want your client's location, you should use client(browser)'s GeoLocation API. (Fron-end)\nWhat you have to do is..\n\nget user location by Geolocation API\npost user location to your server\nreturn location-based information\nupdate your webpage(DOM) with info.","Q_Score":0,"Tags":"python,django,geolocation,geoip","A_Id":46548014,"CreationDate":"2017-10-03T15:11:00.000","Title":"django - How to get location through browser IP","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I\u2019m building a web app (python\/Django) where customers create an account, each customer creates\/adds as many locations as they want and a separate server generates large amounts of data for each location several times a day. \nFor example:\nUser A -> [locationA, locationB]\nUser B -> [locationC, locationD, locationE]\nWhere each location is an object that includes name, address, etc. \nEvery 3 hours a separate server gathers data from various sources like weather, check-ins etc for each location and I need to store each item from each iteration so I can then perform per-user-per-location queries. \nE.g. \u201call the checkins in the last week group by location for User A\u201d\nRight now I am using MongoDB and storing a collection of venues with a field of ownerId which is the ObjectID of the owning user. \nWhat is the best strategy to store the records of data? The na\u00efve approach seems to be a collection for checkins, a collection for weather records etc and each document would have a \u201clocation\u201d field. But this seems to have both performance and security problems (all the access logic would be in web app code). \nWould it be better to have a completely separate DB for each user? Are there better ways?\nIs a different strategy better if we switch to Postgres\/SQL database?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":81,"Q_Id":46553070,"Users Score":1,"Answer":"[GENERAL ADVICE]: I always use Postgres or MySQL as the django ORM connection and then Mongo or DynamoDB for analytics.  You can say that it creates unnecessary complexity because that is true, but for us that abstraction makes it easier to separate out teams too.  You have your front end devs, backend\/ full stacks, and true backend devs.  Not all of them need to be Django experts.\n[SPECIFIC ADVICE]: This sounds to me like you should just get started with mongo.  Unless you are a B2B SaaS app selling to enterprise companies who won't like a multi-tenet data model then it shouldn't be tough to map this out in mongo.  The main reason I say mongo is nice is because it sounds like you don't fully know the schema of what you'll collect ahead of time.  Later you can refactor once you get a better handle of what data you collect.  Expect to refactor and just get the thing working.","Q_Score":1,"Tags":"python,sql,django,mongodb,postgresql","A_Id":46553762,"CreationDate":"2017-10-03T20:41:00.000","Title":"Right strategy for segmenting Mongo\/Postgres database by customer?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a requirement that I need to set up hadoop to save files not just text files it can be image video pdf. And there will be a web application from where user can add files and access files whenever its needed.\nCan it Possible to implement ? also the web application will need to develop by me. Thank You.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":139,"Q_Id":46559124,"Users Score":1,"Answer":"If your application is written in Java, this is easily possible using the DFS Client libraries which can read and write files in HDFS in a very similar way to a standard filesystem. Basically can open an input or output stream and read whatever data you want.\nIf you are planning to use python to build the web application, then you could look at webHDFS, which provides a HTTP based API to put and get files from HDFS.","Q_Score":2,"Tags":"php,python-3.x,hadoop,hdfs,bigdata","A_Id":46566798,"CreationDate":"2017-10-04T07:18:00.000","Title":"Can I access HDFS files from Custom web application","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"For the last few months i've been working on a Rest API for a web app for the company I work for. The endpoints supply data such as transaction history, user data, and data for support tickets. However, I keep running into one issue that always seems to set me back to some extent.\nThe issue I seem to keep running into is how do I handle user authentication for the Rest API securely? All data is going to be sent over a SSL connection, but there's a part of me that's paranoid about potential security problems that could arise. As it currently stands when a client attempts to login the client must provide a username or email address, and a password to a login endpoint (E.G \"\/api\/login\"). Along with with this information, a browser fingerprint must be supplied through header of the request that's sending the login credentials. The API then validates whether or not the specified user exists, checks whether or not the password supplied is correct, and stores the fingerprint in a database model. To access any other endpoints in the API a valid token from logging in, and a valid browser fingerprint are required.\nI've been using browser fingerprints as a means to prevent token-hijacking, and as a way make sure that the same device used to login is being used to make the requests. However, I have noticed a scenario where this practice backfires on me. The client-side library i'm using to generate browser fingerprints isn't always accurate. Sometimes the library spits out a different fingerprint entirely. Which causes some client requests to fail as the different fingerprint isn't recognized by the API as being valid. I would like to keep track of what devices are used to make requests to the API. Is there a more consistent way of doing so, while still protecting tokens from being hijacked?\nWhen thinking of the previous question, there is another one that also comes to mind. How do I store auth tokens on client-side securely, or in a way that makes it difficult for someone to obtain the tokens through malicious means such as a xss-attack? I understand setting a strict Content-Security Policy on browser based clients can be effective in defending against xss-attacks. However, I still get paranoid about storing tokens as cookies or in local storage.\nI understand oauth2 is usually a good solution to user authentication, and I have considered using it before to deal with this problem. Although, i'm writing the API using Flask, and i'm also using JSON Web tokens. As it currently stands, Flask's implementation of oauth2 has no way to use JWTs as access tokens when using oauth for authentication.\nThis is my first large-scale project where I have had to deal with this issue and i am not sure what to do. Any help, advice, or critiques are appreciated. I'm in need of the help right now.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":260,"Q_Id":46562267,"Users Score":0,"Answer":"Put  an API Gateway in front of your API , your API Gateway is publicly ( i.e in the DMZ ) exposed while the actual API are internal.\nYou can look into Kong..","Q_Score":0,"Tags":"python-3.x,rest,api,security,authentication","A_Id":46562640,"CreationDate":"2017-10-04T10:10:00.000","Title":"How to handle Rest API user authentication securely?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using the Django test runner to run my unit tests. Some of these tests use factories which create TONS of files on my local system. They all have a detectable name, and can be removed reasonably easily.\nI'm trying to avoid having to either\n\nKeep a file-deleting cron job running\nChange my custom image model's code to delete the file if it detects that we're testing. Instead, I'd like to have a command run once (and only once) at the end of the test run to clean up all files that the tests have generated.\n\nI wrote a small management command that deletes the files that match the intended convention. Is there a way to have the test runner run call_command on that upon completion of the entire test suite (and not just in the tearDown or tearDownClass methods of a particular test)?","AnswerCount":3,"Available Count":1,"Score":0.0665680765,"is_accepted":false,"ViewCount":1122,"Q_Id":46571485,"Users Score":1,"Answer":"If you create a services.py file in the same folder as models.py, you can put the cleanup code in there and then call it from the management command and from the test tearDown while keeping it DRY.","Q_Score":2,"Tags":"python,django,unit-testing,python-unittest,factory-boy","A_Id":46572485,"CreationDate":"2017-10-04T18:11:00.000","Title":"Django\/unittest run command at the end of the test runner","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Currently I'm working with DMM DNY2, the hardware come together with software. The software can read available port, assign port for servo and read stored parameters in servo driver.\nNow, I'm trying to create python script to do the same as software, i can do for get and assign port, but can't get stored parameters in servo driver. each time doing read it return b''. \nCan someone help me, give me pointers what should I do or what I'm missing.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":37,"Q_Id":46582872,"Users Score":0,"Answer":"You are missing the communication protocol. I.e. What command you should send to get a proper response.\nSo, dig through data-sheets or you will have to reverse-engineer the software you got with the device. Which, perhaps won't be legal if the licence doesn't allow you to use the device with any other program except the one you received etc, etc.\nIf you cannot find the protocol specs in the data-sheets or on the internet, then install RS232 virtual card, make a loopback device so that you connect to one virtual port and the real port is connected to another and you can be a 'man in the middle' and see what data passes through when the software you got communicates with the device.\nEnjoy!","Q_Score":0,"Tags":"python,hardware,pyserial","A_Id":46583150,"CreationDate":"2017-10-05T10:00:00.000","Title":"Read DMM DNY2 servo driver stored parameters using python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Setup: Google App Engine application on Python standard environment.\nCurrently, the app uses the NDB library to read\/write from its Datastore. It uses async tasklets for parallel, asynchronous reads from Datastore, and memcache.\nIf I would like to use Firestore as a replacement for Datastore, it seems that I would have to use the Google Cloud Client Library for Python. I believe that the google-cloud lib doesn't support a mechanism like tasklets. But I wonder: Does the lib use a thread-safe cache-mechanism for its requests to the Firestore API, and maybe even GAE's memcache?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":217,"Q_Id":46585670,"Users Score":2,"Answer":"The Cloud Firestore server-side client libraries are not optimized for App Engine Standard. They  don't integrate with a caching solution like GAE's memcache; you'd have to write that layer yourself.","Q_Score":1,"Tags":"google-app-engine,firebase,google-app-engine-python,google-cloud-python,google-cloud-firestore","A_Id":46625646,"CreationDate":"2017-10-05T12:29:00.000","Title":"Does Cloud Python lib in GAE use caching or memcache for access to Cloud Firestore data?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"So I have two table in a one-to-many relationship. When I make a new row of Table1, I want to populate Table2 with the related rows. However, this population actually involves computing the Table2 rows, using data in other related tables. \nWhat's a good way to do that using the ORM layer? That is, assuming that that the Table1 mappings are created through the ORM, where\/how should I call the code to populate Table2?\nI thought about using the after_insert hook, but i want to have a session to pass to the population method.\nThanks.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":601,"Q_Id":46594866,"Users Score":1,"Answer":"After asking around in #sqlalchemy IRC, it was pointed out that this could be done using ORM-level relationships in an before_flush event listener.\nIt was explained that when you add a mapping through a relationship, the foreign key is automatically filled on flush, and the appropriate insert statement generated by the ORM.","Q_Score":1,"Tags":"python,sql,database,orm,sqlalchemy","A_Id":46777010,"CreationDate":"2017-10-05T21:11:00.000","Title":"Populating related table in SqlAlchemy ORM","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've been wanting to run my own server for a while and I figured that running one for my django website would be a good start. What do you recommend I use for this? I've been trying to use a Ubuntu Virtual Machine to run it on one of my old laptops that I don't really use anymore until I can buy a dedicated server. \nShould I run it from a Virtual Machine? If so, would Ubuntu be best? That appears to be the case, but I want to be sure before I invest in anything. I want to be able to access the website from other computers, just like any other website. Am I going about this wrong? If so, what can you suggest me?","AnswerCount":4,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":873,"Q_Id":46616153,"Users Score":0,"Answer":"It really depends on your requirements. Will you be accessing the website externally (making it public) or locally? Running Django from your laptop can work but if you are planning to make it public, you will need an external IP to point your domain to. Unless you have a business account, ISPs usually don't give static IPs to individual customers. Ubuntu would be a wise choice and you can run conda or virtualenv easily. \nVPS are quite cheap these days. You can look into AWS free tier that provides you with 500 hours\/month on a micro server. \nIf you are planning to access your website internally then you don't need anything other than your laptop or perhaps raspberry pi. If you are trying to make it available for everyone on the external network, VPS would be the best bet.","Q_Score":0,"Tags":"python,django,ubuntu,server,virtual-machine","A_Id":46616491,"CreationDate":"2017-10-07T02:40:00.000","Title":"How to run a Django Project on a Personal Run Server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've been wanting to run my own server for a while and I figured that running one for my django website would be a good start. What do you recommend I use for this? I've been trying to use a Ubuntu Virtual Machine to run it on one of my old laptops that I don't really use anymore until I can buy a dedicated server. \nShould I run it from a Virtual Machine? If so, would Ubuntu be best? That appears to be the case, but I want to be sure before I invest in anything. I want to be able to access the website from other computers, just like any other website. Am I going about this wrong? If so, what can you suggest me?","AnswerCount":4,"Available Count":3,"Score":1.2,"is_accepted":true,"ViewCount":873,"Q_Id":46616153,"Users Score":0,"Answer":"Yes, you will need a static IP address.\nIf this is your first experiment, my advice would be:\n1) Use an old, dedicated PC with no other stuff on it.  Unless you do it just right, you should presume hackers could get anything on the disk...\n2) Why make life complex with layer after layer of software?  Install Ubuntu and run a standard server under a Unix OS\n3) Be very careful about the rest of your attached network.  Even if the PC is dedicated, unless you properly managed port forwarding, etc., ALL of your computers could be susceptible to attack.\nAn old friend of mine discovered, back in the Napster peer-to-peer days, that he could basically go and read EVERYTHING on the hard drives of most people who had set up Napster on their computer.","Q_Score":0,"Tags":"python,django,ubuntu,server,virtual-machine","A_Id":46617161,"CreationDate":"2017-10-07T02:40:00.000","Title":"How to run a Django Project on a Personal Run Server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've been wanting to run my own server for a while and I figured that running one for my django website would be a good start. What do you recommend I use for this? I've been trying to use a Ubuntu Virtual Machine to run it on one of my old laptops that I don't really use anymore until I can buy a dedicated server. \nShould I run it from a Virtual Machine? If so, would Ubuntu be best? That appears to be the case, but I want to be sure before I invest in anything. I want to be able to access the website from other computers, just like any other website. Am I going about this wrong? If so, what can you suggest me?","AnswerCount":4,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":873,"Q_Id":46616153,"Users Score":0,"Answer":"As already stated Ubantu is a good choice but there is also Debian. I use Debian because I started off working with a colleague who was already using it and I find it very good.  I began with an old, disused desktop PC which I nuked and turned into a proper linux server. For development I didn't need a very high spec machine. (Think it has 1 GB ram)  I have it set up in my flat and my domestic internet connection is fine for most of my needs. Note:  It isn't necessary to have a static IP address for development, although it is preferable if you already have one.  As an alternative you can use a service such as dnydns.org where you can set up virtual domain names that point to your domestic dynamic IP address.  Most routers these days have facilities within them for updating services like dyndns.org with your new dynamic IP address or you can install a plug-in to your server that will do this for you.  All my projects have their own virtualenvs and I have VNCServer installed so I can access my server and work from anywhere where I have an internet connection.  I've been running this way for the past three years with some household name clients and haven't had any issues at all. \nWhen it comes to production you can simply use any of the many VPS services that are out there. Amazon has already been mentioned. Someone recommended creating a droplet at DigitalOcean.com as I was wanting to host django applications and I find them to be very good and cost effective.  Anyway just my 2 cents worth...hope it helps","Q_Score":0,"Tags":"python,django,ubuntu,server,virtual-machine","A_Id":46618880,"CreationDate":"2017-10-07T02:40:00.000","Title":"How to run a Django Project on a Personal Run Server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working with a small company currently that stores all of their app data in an AWS Redshift cluster. I have been tasked with doing some data processing and machine learning on the data in that Redshift cluster.\nThe first task I need to do requires some basic transforming of existing data in that cluster into some new tables based on some fairly simple SQL logic. In an MSSQL environment, I would simply put all the logic into a parameterized stored procedure and schedule it via SQL Server Agent Jobs. However, sprocs don't appear to be a thing in Redshift. How would I go about creating a SQL job and scheduling it to run nightly (for example) in an AWS environment? \nThe other task I have involves developing a machine learning model (in Python) and scoring records in that Redshift database. What's the best way to host my python logic and do the data processing if the plan is to pull data from that Redshift cluster, score it, and then insert it into a new table on the same cluster? It seems like I could spin up an EC2 instance, host my python scripts on there, do the processing on there as well, and schedule the scripts to run via cron?\nI see tons of AWS (and non-AWS) products that look like they might be relevant (AWS Glue\/Data Pipeline\/EMR), but there's so many that I'm a little overwhelmed. Thanks in advance for the assistance!","AnswerCount":3,"Available Count":1,"Score":0.0665680765,"is_accepted":false,"ViewCount":2154,"Q_Id":46618762,"Users Score":1,"Answer":"The 2 options for running ETL on Redshift\n\nCreate some \"create table as\" type SQL, which will take your source\ntables as input and generate your target (transformed table)\nDo the transformation outside of the database using an ETL tool. For\nexample EMR or Glue.\n\nGenerally, in an MPP environment such as Redshift, the best practice is to push the ETL to the powerful database (i.e. option 1). \nOnly consider taking the ETL outside of Redshift (option 2) where SQL is not the ideal tool for the transformation, or the transformation is likely to take a huge amount of compute resource.\nThere is no inbuilt scheduling or orchestration tool. Apache Airflow is a good option if you need something more full featured than cron jobs.","Q_Score":1,"Tags":"python,database,amazon-web-services,amazon-redshift","A_Id":46640656,"CreationDate":"2017-10-07T09:41:00.000","Title":"AWS Redshift Data Processing","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I currently have a Django project running on a server behind Cloudflare. However, a number of the apps contain functionality that requires synchronizing data with certain web services. This is a security risk, because these web services may reveal the IP address of my server. Therefore I need a solution to prevent this. \nSo far I came up two alternatives: using a proxy or splitting the project to two servers. One server responsible for responding to requests through Cloudflare and one server responsible for synchronizing data with other web services. The IP address of the latter server will be exposed to the public, however attacks on this server will not cause the website to be offline. I prefer the second solution, because this will also split the load between two servers.\nThe problem is that I do not know how I should do this with Django without duplicating code. I know I can re-use apps, but for most of them counts that I, for instance, only need the models and the serializers and not the views etc. How should I solve this? What is the best approach to take? In addition, what is an appropriate naming for the two servers? Thanks","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":68,"Q_Id":46621609,"Users Score":0,"Answer":"This sounds like a single project that is being split as part of the deployment strategy. So it makes sense to use just a single codebase for it, rather than splitting it into two projects. If that's the case, re-use is a non-issue since both servers are using the same code.\nTo support multiple deployments, then, you just create two settings files and load the appropriate one on the appropriate server. The degree to which they are different is up to you. If you want to support different views you can use different ROOT_URLCONF settings. The INSTALLED_APPS can be different, and so forth.","Q_Score":1,"Tags":"python,django,architecture,django-rest-framework,cloudflare","A_Id":46624369,"CreationDate":"2017-10-07T14:59:00.000","Title":"django - split project to two servers (due to Cloudflare) without duplicating code","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I successfully installed mod_wsgi via pip install mod_wsgi on Windows. However, when I copy the output of mod_wsgi-express module-config into my httpd.conf and try to start the httpd, I get the following error:\nhttpd.exe: Syntax error on line 185 of C:\/path\/to\/httpd.conf: Cannot load c:\/path\/to\/venv\/Lib\/site-packages\/mod_wsgi\/server\/mod_wsgi.pyd into server\nThis is already after correcting the pasted output of module-config, as it was ...\/venv\/lib\/site-packages\/mod_wsgi\/server\/mod_wsgiNone (note the \"None\"). I changed the \"None\" to \".pyd\" as this is the correct path.\nI already tried to install it outside the virtual env (Python being at C:\\Python27), but it didn't make a difference -> same error.\nI also tried to uninstall\/re-install mod_wsgi. I had one failed install as Microsoft Visual C++ Compiler for Python 2.7 (Version 9.0.0.30729) was not present. After that installation, the mod_wsgi always installed OK.\nThe apache (Apache\/2.4.27 (Win32)) comes from the xampp package and starts without issues when I remove the added lines for wsgi. \nI need to use Python 2.7 because of a third-party module. So going for 3.x is unfortunately not an option at the moment.\nExact Python version is 2.7.13 (32-bit).\nFor completeness, the output of module-config is:\nLoadModule wsgi_module \"c:\/www\/my_project\/venv\/lib\/site-packages\/mod_wsgi\/server\/mod_wsgiNone\"\nWSGIPythonHome \"c:\/www\/my_project\/venv\"\nUpdate: tried one more thing:\n\nUninstalled mod_wsgi (with pip)\nset \"MOD_WSGI_APACHE_ROOTDIR=C:\/WWW\/apache\"\nAnd pip install mod_wsgi again\n\nStill the same error...","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1202,"Q_Id":46622112,"Users Score":0,"Answer":"The issue was that the Apache was built with VC14, but Python 2.7 naturally with VC9. Installing an Apache built with VC9 solved my issue.","Q_Score":0,"Tags":"python,apache,mod-wsgi,windows-server-2008-r2","A_Id":46645404,"CreationDate":"2017-10-07T15:46:00.000","Title":"Getting mod_wsgi to work with Python 2.7\/Apache on Windows Server 2012; cannot load module","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have roughly 200 documents that need to have IBM Watson NLU analysis done.  Currently, processing is performed one at a time.  Will NLU be able preform a batch analysis? What is the correct python code or process to batch load the files and then response results?  The end goal is to grab results to analyze which documents are similar in nature.  Any direction is greatly appreciated as IBM Support Documentation does not cover batch processing.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":445,"Q_Id":46624822,"Users Score":0,"Answer":"NLU can be \"manually\" adapted to do batch analysis. But the Watson service that provides what you are asking for is Watson Discovery. It allows to create Collections (set of documents) that will be enriched thru an internal NLU function and then queried.","Q_Score":0,"Tags":"python,ibm-cloud,ibm-watson,watson-nlu","A_Id":46929384,"CreationDate":"2017-10-07T20:31:00.000","Title":"IBM Watson Natural Language Understanding uploading multiple documents for analysis","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to install WSGI for python web application on windows-10. But when I run pip install mod_wsgi command i get error.\nerror: command 'C:\\Program Files (x86)\\Microsoft Visual Studio 14.0\\VC\\BIN\\link.exe' failed with exit status 1120\nAnybody can resolve this problem?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":612,"Q_Id":46630087,"Users Score":1,"Answer":"Current understanding is that 32 bit builds are broken. That or you are mixing 32 bit and 64 bit versions of Python, Apache or the Windows compilers. They must be all 32 bit or all 64 bit.","Q_Score":0,"Tags":"python-3.x,mod-wsgi","A_Id":46630144,"CreationDate":"2017-10-08T10:31:00.000","Title":"wsgi_mod installation in windows 10","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"When I do something like:\nec2_client.describe_images(ImageIds=['ami-123456'])\nThe response I get is missing the 'Tags'. This is not the case when I do the same call using aws cli:\naws ec2 describe-images --image-ids ami-123456","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":113,"Q_Id":46645664,"Users Score":0,"Answer":"FYI: The problem is caused by the fact that credentials from another account was used due to our setup with parent and child accounts","Q_Score":0,"Tags":"python,amazon-web-services,amazon-ec2,botocore","A_Id":46651021,"CreationDate":"2017-10-09T11:44:00.000","Title":"botocore - Tags are missing from 'describe_images' response","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a python zosftplib function call that submits a MVS job successfully, but it does not recognize that the job completed and it does not receive the JES output from the job. I can successfully make the MVS FTP connection and can upload and download files.\nThe code looks like this:\njob = Myzftp.submit_wait_job(jcl)\nThe call eventually displays the following error message.\nFile \"C:\\Python27\\lib\\site-packages\\zosftplib.py\", line 410, in submit_wait_job %(msg, resp))\nZftpError: 'submit_wait_job error: 550 JesPutGet aborted, job not found (last response:250 Transfer completed successfully.)'\nAny suggestions would be helpful on how I can resolve this.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":694,"Q_Id":46648039,"Users Score":0,"Answer":"Working with MVS FTP and JES can be very specific. For example my MVS ID was MVSIDD. My jobcard had a jobname of MVSIDDXY. So the submit_wait_job() function would submit the job correctly and it would run successfully. The problem came with returning the JES output back to FTP. It was expecting a jobname with my id and a single character not two. By changing the jobname in the jobcard to MVSIDDX the function worked as expected and waited until the job was over and then returned all the JES output with it.","Q_Score":0,"Tags":"python,zos,mvs","A_Id":46654808,"CreationDate":"2017-10-09T13:46:00.000","Title":"zosftplib submit_wait_job(jcl) function does not receive JES output","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have python webjobs running on Azure. There are times when the script hangs because of which I need to force restart it so next iteration can pick it up.\nHow do I configure force stopping a webjob if running longer than 1 hour? Basically I want to mimic task scheduler's behavior.\nMy files on the webjob:\n\nrun.cmd\nD:\\home\\Python35\\python.exe main.py\nmain.py\njust another python file\nsettings.job\n{\"is_singleton\":true}\n\nAt a given time, I want only 1 instance of the job running.\nEdit (Answer): As a workaround, I changed continuous webjob to triggered one. And added this in app setting:\n\nWEBJOBS_IDLE_TIMEOUT = 120\n\nI'm printing something on the console every now and then. If no CPU activity is detected for 2 mins, the job will be aborted.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":431,"Q_Id":46657070,"Users Score":1,"Answer":"You might want a second webjob that you can incorporate a healthcheck and restart the primary webjob if it detects no activity in your processes.\nAnother idea could be to use azure automation and have a powershell script that just restarts the webjob every hour.","Q_Score":1,"Tags":"python,azure,azure-webjobs","A_Id":46657105,"CreationDate":"2017-10-10T00:51:00.000","Title":"Azure WebJob: Force stop if running longer than X mins","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I want to hide edit button based on user group. However I don't want to edit ir.model.access.csv, because some process in my system flow must be able some user group to write the model by code.\nAre there some way to hide edit button from some group of user ?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2386,"Q_Id":46661246,"Users Score":0,"Answer":"Thanks for your answer, it really helped me.\nBut when i remove edit\/create button for some group (ex: Purchase: User), also the edit\/create buttons got removed for the higher groups (ex: Purchase: Manager) of the specified group (ex: Purchase: User).\nMy case:\nI've removed edit button for Purhcase: User group, and I see the edit button got removed also for the Purchase: Manager group.\nThe solution I tried:\nI have created one more view for Purchase: Manager group and given edit TRUE. So I've created two views for two groups\nLooking for better solution to achieve this scenario with single view, as it isn't good to create many views for many groups.","Q_Score":3,"Tags":"python,python-2.7,openerp,odoo-10,erp","A_Id":58504044,"CreationDate":"2017-10-10T07:46:00.000","Title":"Odoo How to hide edit button based on User Group?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was able to get the callback with the redirect_uri and auth code and I was able to authorize the user and redirect him but I am not getting the account_linking in the request object after successful login ie.., I want to check whether the user is logged in or not for every message he sends.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":125,"Q_Id":46667754,"Users Score":0,"Answer":"The account linking feature does not support this type of token validation. You would need to send a request to your auth server to check if the person is still logged in.","Q_Score":0,"Tags":"python,bots,facebook-messenger,messenger,facebook-messenger-bot","A_Id":46671593,"CreationDate":"2017-10-10T13:16:00.000","Title":"Facebook messenger account linking","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using BOT API for telegram,\nthrough setGameScore i tried to set game score of user with _user_id_ and score but its not working ...\nused bot.setGameScore (user_id = 56443156,score=65)\nIam not using game to set only for inlinequery\ni received a  caused error : \"Message to set game score not found\"","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":489,"Q_Id":46685936,"Users Score":0,"Answer":"Used :\nbot.setGameScore (user_id = 5432131, score=76,inline_message_id=uygrtfghfxGKJB)\nI received these two(user_id,inline_message_id)  parameters  from update.callback_query","Q_Score":0,"Tags":"python,python-telegram-bot","A_Id":46703372,"CreationDate":"2017-10-11T10:30:00.000","Title":"How to set game score using setGameScore in python telegram bot","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So I'm setting up a server by myself. Now I ran into lots of different ways where to install the packages.\nI am thinking of the core packages like nginx, gunicorn, python3, postgresql and so on.\nI learned that setting up a VENV (virtual environment) is a good thing so I can have several projects running with different versions on packages.\nBut it's a bit confusing wich ones are not going to be inside the VENV.\nSome install postgreSQL outside the VENV, but psycopg2 inside. Some the gunicorn inside VENV. and so on.\nAre there any best practices or rules that are better safe to follow?\nFor info. I'm setting up a Ubuntu server 16.04 with Nginx, gunicorn. PostgreSQL, psycopg2, python3","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":45,"Q_Id":46713759,"Users Score":0,"Answer":"@Mounir's answer is pretty solid- but I wanted to tag on another piece of advice- using playbooks from Ansible Galaxy is also another option.  Existing playbooks already exist for lots of usecases (including Django) and they take into account many of these best practices.  I am not saying that all playbooks on Galaxy are good- but some are, and by virtue of being open source, they are frequently patched and updated.","Q_Score":0,"Tags":"python,django,nginx,server","A_Id":46714888,"CreationDate":"2017-10-12T15:42:00.000","Title":"Best practice for package install on django server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using bootstrap with nav-tabs to hopefully select filtered images based on the tab clicked. I can do an AJAX call to the view that I created that filters out the images based on category and returns an items.html template file. \nIs there a way to load the partial template without having to reload the entire page? Should I just do the AJAX call and it will update that partial view?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":252,"Q_Id":46714151,"Users Score":0,"Answer":"Just make ajax calls to the view and return only the required content from the server and and on ajax success replace using .html() method.","Q_Score":0,"Tags":"javascript,jquery,python,ajax,django","A_Id":46714365,"CreationDate":"2017-10-12T16:03:00.000","Title":"Python Django Load Images based on Tab Clicked","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have two models connected to Django Admin system.\nAnd would like to have a possibility such that by using the dropdown list, choose a specific value from the first model in a second model.\nWhat do you think? Is this possible?\nThanks in advance","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":439,"Q_Id":46719157,"Users Score":0,"Answer":"Adding a foreign key relationship will add this to the UI but make sure you haven\u2019t included that field\u2019s name in raw_id_fields","Q_Score":0,"Tags":"python,django,django-models,django-admin","A_Id":47341274,"CreationDate":"2017-10-12T21:27:00.000","Title":"How to join two tables in Django Admin system","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am testing out a very basic Pub\/Sub subscription. I have the push endpoint set to an App I have deployed through a Python Flex service in App Engine. The service is in a project with Identity-Aware Proxy enabled. The IAP is configured to allow through users authenticated with our domain.\nI do not see any of the push requests being processed by my app.\nI turned off the IAP protection and then I see that the requests are processed. I turn it back on and they are no longer processed.\nI had similar issues with IAP when trying to get a Cron service running; that issue resolved itself after I deployed a new test app in the same project.\nHas anyone had success with configuring a push subscription through IAP? I also experimented with putting different service accounts on the IAP access list and none of them worked.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":890,"Q_Id":46729915,"Users Score":1,"Answer":"I had a pretty similar issue - a GAE 2nd G standard application in project A, which is wired under IAP, that cannot receive the pushed pub\/sub message from project B.\nMy workaround is: \n\nSetup Cloud Function (HTTP triggered) in project A;\nSetup the subscription of project B Pub\/Sub topic to push the message to above Cloud Function endpoint;\nThe above Cloud Function works like a proxy to filter (needed based on my case, ymmv) and forwards the Pub\/Sub message in a http request to the GAE app;\nSince the Cloud Function is within same project with the GAE app, there is only needed to add the IAP authentication for above http request (which fetches the token assigned from the specific SA).\nThere should be a project A's SA setup in Project B IAM, which may have at least Pub\/Sub Subscriber and Pub\/Sub Viewer roles.\n\nHope this could be an option for your case.","Q_Score":2,"Tags":"python,google-app-engine,push,publish-subscribe,google-iap","A_Id":59740146,"CreationDate":"2017-10-13T12:25:00.000","Title":"Google Pub\/Sub push subscription into IAP-protected App Engine","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm running into a performance issue with Google Cloud Bigtable Python Client. I'm working on a flask API that writes to and reads from a GCP Bigtable instance. The API uses the python client to communicate with Bigtable, and was deployed to GCP App Engine flexible environment.\nUnder low traffic, the API works fine. However during a load test, the endpoints that reads and writes to Bigtable suffers a huge performance decrease compare to a similar endpoint that doesn't communicate with Bigtable. Also, a large percentage of requests went to the endpoint receives a 502 Bad Gateway, even when health check was turned off in App Engine.\nI'm aware of that the client is currently in Alpha. I wonder if the performance issue is known, or if anyone also ran into the same issue\nUpdate\nI found a documentation from Google stating:\n\nThere are issues with the network connection. Network issues can\n  reduce throughput and cause reads and writes to take longer than\n  usual. In particular, you'll see issues if your clients are not\n  running in the same zone as your Cloud Bigtable cluster.\n\nIn my case, my client is in a different region, by moving it to the same region had a huge increase in performance. However the performance issue still exist, and the recommendation from the documentation is to put client in the same zone as Bigtable.\nI also considered using Container engine or Compute Engine where it is easier to specify the zone, but I want stay with App Engine for its autoscale functionality and managed services.","AnswerCount":1,"Available Count":1,"Score":0.537049567,"is_accepted":false,"ViewCount":503,"Q_Id":46740127,"Users Score":3,"Answer":"Bigtable client take somewhere between 3 ms to 20 ms to complete each request, and because python is single threaded, during that period of time it will just wait until the response comes back. The best solution we found was for any writes, publish the request to Pubsub, then use Dataflow to write to Bigtable. It is significantly faster because publishing a message in Python would take way below 1 ms to complete, and because Dataflow can be set to exactly the same region as Bigtable, and it is easy to parallel, it can write much faster.\nThough it doesn't solve the scenario where you need frequent read or write need to be instantaneous","Q_Score":1,"Tags":"google-app-engine,google-cloud-platform,bigtable,google-cloud-bigtable,google-cloud-python","A_Id":47776406,"CreationDate":"2017-10-14T02:03:00.000","Title":"Google Cloud Bigtable Python Client Performance Issue","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"In a school project, my team and I have to create a shopping website with a very specific server-side architecture. We agreed to use python and turned ourselves towards Django since it seemed to offer more functionalities than other possible frameworks. Be aware that none of us ever used Django in the past. We aren't masters at deploying application on the web either (we are all learning).\nHere's my problem: two weeks in the project, our teacher told us that we were not allowed to use any ORM. To me, this meant bye bye to Django models and that we have to create everything on our own. \nHere are my questions: as we already have created all our python classes, is there any way for us to use them alongside our Django app? I have not seen any example online of people using their own python classes within a Django app. If it were possible, where should we instantiate all our objects? Would it be easier to just go with another framework (I am thinking about Flask). Am I just missing important information about how Django works and asking a dumb question?\nWe have 4 weeks completed and 6 more to go before finishing our project. I often see online \"use Flask before using Django\" since it is simpler to use. We decided on Django because in the project description, Django was recommended but not Flask.\nThanks for the help.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":74,"Q_Id":46745753,"Users Score":2,"Answer":"Without being an absolute Django expert, here is my opinion. \nThe Django ORM is far from being the only feature this Framework has to offer (URLs routing, test client, user sessions variables, etc.), but surely it is one the main component you want to use while working with Django since it is often directly linked to other core features of Django.  \nIf using the ORM is completely forbidden, a lot of features out of the box won't be available for you. One of the main features I can think about is the admin interface. You won't be able to use it if the ORM is not an option for you.\nSo, in my opinion, you should go for another Framework like Flask. Mainly because without using the ORM, some of the Django value is gone.\nHope it helps!","Q_Score":0,"Tags":"python,django,django-models","A_Id":46745981,"CreationDate":"2017-10-14T14:41:00.000","Title":"Using custom python classes alongside Django app","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a website which has been built using HTML and PHP.\nI have a Microsoft SQL Server database. I have connected to this database and created several charts using Python.\nI want to be able to publish these graphs on my website and make the graphs live (so that they are refreshed every 5 minutes or so with latest data). How do I do this?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":161,"Q_Id":46752760,"Users Score":0,"Answer":"You could add a process to crontab to run the Python program every 5 minutes (assuming Linux). You could, alternatively, have the PHP call Python and await the refreshed file before responding with the page.","Q_Score":0,"Tags":"python,html,graph","A_Id":46752813,"CreationDate":"2017-10-15T07:33:00.000","Title":"Live graphs using python on website","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I know very little about js and I'm trying to create a program that will get information about a browser based javascript game while I play it. I can't use a webdriver as I will be playing the game at the time. \nWhen I inspect the js on google chrome and look at the console, I can see all the information that I want to work with but I don't know how I can save that to a file or access it at the time in order to parse it. Preferably I'd be able to do this with python as that's what I will use for my code that will handle the info once I have it. \nAny help or a point in the right direction would be appreciated, thank you :)\nps, I'm on Windows if that's important","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":36,"Q_Id":46759726,"Users Score":0,"Answer":"hacking a game I see. Provided you are aware that what you are doing may diminish the validity of other's playtime as well as potentially committing a crime, I shall provide a solution:\nYou would need to get a piece of \"sniffing\" software which allows modifications.\nThe modifications are likely to be the addition of \"Querystring\" and \"JSON\" parsers to read the data traffic. At this point, you can begin learning how their particular system works, slowly replacing traffic with modified versions for your nefarious purposes.\n\"TCP Sniffing\" includes creating a \"RAW TCP SOCKET\" in whatever language and then repeatedly \"READ'ing \/ RECV'ing\" from that socket. The socket MUST be bound TO THE SPECIFIC NETWORK INTERFACE CARD (NIC). Hint: \"LOCALHOST\" and \"127.0.0.1\" are NOT the addresses of any NIC.\nYou would then parse the data as a HTTP req\/res stream, ensuring that you can read the contents of the frame correctly.\nYou would then be looking to either modify the contents of the POST body or the GET querystring. Either, depending on how the game designers designed their network system.","Q_Score":0,"Tags":"python,screen-scraping","A_Id":46760481,"CreationDate":"2017-10-15T20:35:00.000","Title":"How to scrape javascript while using a webpage normally?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have installed pyaudio (latest as of today Oct 16, 2017) in my Raspberry PI 3 with \"sudo pip3 install pyaudio\". I am running \"python3\" for the code below:\n\nimport pyaudio\n\np = pyaudio.PyAudio()\nprint(\"Number of devices={}\".format(p.get_device_count()))\n\n\nThis prints Number of devices=0\nDoes anyone have the same problem? Need help to resolve this issue.\nAdditional info: \"lsusb\" prints all the devices. \nI am able to see the device in alsamixer. I am able to test that device works. Looks like pyaudio & python3 may have something to do.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":53,"Q_Id":46774670,"Users Score":0,"Answer":"The above issue was happening with Raspberry NOOBS image.\nI ended up downloading the RASPBIAN image and finally it is working though pyaudio is printing too many warning messages.","Q_Score":1,"Tags":"python-3.x,pyaudio","A_Id":46991552,"CreationDate":"2017-10-16T16:13:00.000","Title":"Raspberry Pi 3 pyaduio does not detect any devices","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"For the past few months, I have been using Selenium to automate a very boring but essential part of my job which involves uploading forms.\nRecently, the site has implemented a feed back survey which randomly pops up and switches the driver to a new frame. I have written the code which can handle this pop up and switch back to my default frame however the issue is with the randomness.\nIs there a way to run my popup handling code as soon the exception generated by the wrong frame is thrown?\nI could encase my whole script in a try and except block but how do I direct the script to pick back up from where it left off?\nAny advice is much appreciated!","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":2555,"Q_Id":46776659,"Users Score":1,"Answer":"I have encountered a similar kind of situation. \nMy recommendation to you is speak to your front end devs or the company which provides the feedback survey and ask them for a script to disable the pop-ups for a browser session that you run. \nThen, execute the script using selenium library(like JavascriptExecutor) as soon as you open the web page so that you do not see the random occuring pop-ups.","Q_Score":5,"Tags":"python,selenium,automation,selenium-chromedriver","A_Id":46777247,"CreationDate":"2017-10-16T18:17:00.000","Title":"Selenium Python - How to handle a random pop up?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"For the past few months, I have been using Selenium to automate a very boring but essential part of my job which involves uploading forms.\nRecently, the site has implemented a feed back survey which randomly pops up and switches the driver to a new frame. I have written the code which can handle this pop up and switch back to my default frame however the issue is with the randomness.\nIs there a way to run my popup handling code as soon the exception generated by the wrong frame is thrown?\nI could encase my whole script in a try and except block but how do I direct the script to pick back up from where it left off?\nAny advice is much appreciated!","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":2555,"Q_Id":46776659,"Users Score":2,"Answer":"I've encountered this on sites that I work on also. What I've found on our site is that it's not really random, it's on a timer. So basically the way it works is a customer comes to the site. If they haven't been prompted to sign up for X, then they get a popup. If they signed up or dismissed the popup, a cookie is written tracking that they already got the message. You want to find that tracking cookie and recreate it to prevent the popups.\nWhat I did was find that cookie, recreate it on an error page on the site domain (some made up page like example.com\/some404page), and then start the script as normal. It completely prevents the popup from occurring.\nTo find out if this is your case, navigate to the home page (or whatever is appropriate) and just wait for the popup. That will give you a sense of how long the timer is. Close the popup and reload the page. If the popup doesn't occur again, then I'm guessing it's the same mechanic.\nTo find the cookie, clear cookies in your browser and open your site again. (Don't close the popup yet). I use Chrome so I'll describe how to do it. The general approach should work in other browsers but the specific steps and command names may vary.\n\nOpen up the devtools (F12)\nNavigate to the Application tab and find Cookies (left panel)\nExpand Cookies and click on the domain of the site you are working on. There may be a lot of cookies in there from other sites, depending on your site.\nClick the Clear All button to clear all the cookies.\nClose the popup and watch for cookies to be created. Hopefully you will see one or just a few cookies created.\nNote the name of the cookies and delete them one at a time and reload the page and wait the 15s (or whatever) and see if the popup occurs.\n\nOnce the popup appears, you know that the last cookie you deleted is the one you need to recreate. You can now write a quick function that creates the cookie using Selenium by navigating to the dummy error page, example.com\/some404page, and create the cookie. Call that function at the start of your script. Profit.","Q_Score":5,"Tags":"python,selenium,automation,selenium-chromedriver","A_Id":46777980,"CreationDate":"2017-10-16T18:17:00.000","Title":"Selenium Python - How to handle a random pop up?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"This is probably not the best title for this question.\nSo i have a nodejs application running on my server which currently uses a python script for web-scraping but i am looking at moving this to the client-side due to individual client seeing different versions (potentially unique) of the same site.\nI an ideal world i would like to use javascript to get the html response from a page (what i can see in chrome by right-clicking and choosing view source) to then be processed in javascript. \nHowever from what i have read online this does not seem to be possible. I am aware of sites that provide the response (such as anyorigin.com) that can be scraped. However, these are not really suitable for me as i need to be able to scrape what the user see's as each user can potentially see something different on the site i want to scrape. The python script i am currently using would do this but it would require the user to have python installed in order for me to be able to execute it and this cannot be guaranteed.\nApologies for the block of text.\nIs there any solution to this problem ?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":1650,"Q_Id":46776763,"Users Score":1,"Answer":"After some research and the suggestions received, i created a chrome extension using the simple guide on the Chrome Developer site and used a CORSrequest to get what i needed.\nIf anyone finds this question and would like help, i am happy to provide further details\/assistance :)","Q_Score":1,"Tags":"javascript,python,node.js,client-side","A_Id":47111903,"CreationDate":"2017-10-16T18:23:00.000","Title":"Web Scraping on client-side","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"This is probably not the best title for this question.\nSo i have a nodejs application running on my server which currently uses a python script for web-scraping but i am looking at moving this to the client-side due to individual client seeing different versions (potentially unique) of the same site.\nI an ideal world i would like to use javascript to get the html response from a page (what i can see in chrome by right-clicking and choosing view source) to then be processed in javascript. \nHowever from what i have read online this does not seem to be possible. I am aware of sites that provide the response (such as anyorigin.com) that can be scraped. However, these are not really suitable for me as i need to be able to scrape what the user see's as each user can potentially see something different on the site i want to scrape. The python script i am currently using would do this but it would require the user to have python installed in order for me to be able to execute it and this cannot be guaranteed.\nApologies for the block of text.\nIs there any solution to this problem ?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1650,"Q_Id":46776763,"Users Score":0,"Answer":"I was recently trying to do something very similar, and unfortunately, as far as I know there's not a way to do this on the client-side. You may be able to do some trickery and \"post\" the data you need back you the server where you deal with it, but I don't imagine that will be very efficient or straight forward. \nThough if you do find something, please do share.","Q_Score":1,"Tags":"javascript,python,node.js,client-side","A_Id":46776879,"CreationDate":"2017-10-16T18:23:00.000","Title":"Web Scraping on client-side","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a python project and i want to deploy it on an AWS EC2 instance. My project has dependencies to other python libraries and uses programs installed on my machine. What are the alternatives to deploy my project on an AWS EC2 instance?\nFurther details : My project consist on a celery periodic task that uses ffmpeg and blender to create short videos.\nI have checked elastic bean stalk but it seems it is tailored for web apps. I don't know if containerizing my project via docker is a good idea...\nThe manual way and the cheapest way to do it would be :\n1- Launch a spot instance\n2- git clone the project\n3- Install the librairies via pip\n4- Install all dependant programs\n5- Launch periodic task\nI am looking for a more automatic way to do it.\nThanks.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":467,"Q_Id":46791798,"Users Score":2,"Answer":"Beanstalk is certainly an option.   You don't necessarily have to use it for web apps and you can configure all of the dependencies needed via .ebextensions.\nContainerization is usually my go to strategy now.   If you get it working within Docker locally then you have several deployment options and the whole thing gets much easier since you don't have to worry about setting up all the dependencies within the AWS instance. \nOnce you have it running in Docker you could use Beanstalk, ECS or CodeDeploy.","Q_Score":1,"Tags":"python,amazon-web-services,amazon-ec2,deployment,ffmpeg","A_Id":46792730,"CreationDate":"2017-10-17T13:48:00.000","Title":"What are the ways to deploy python code on aws ec2?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"When using the Django Admin panel, I am able to add new instances to Users and Groups. The same thing goes for all my apps, except for one. This one app, resultregistration, always gives me a ProgrammingError whenever I try to add a new model. For example, this app has a Competition-model where data about a sport competition should be stored. \nWhen I click \"+ Add\" I am taken to the correct site where I can add a new competition. However, when I press save I get: \nProgrammingError at \/admin\/resultregistration\/competition\/add\/\ncolumn \"competition_category\" of relation \"resultregistration_competition\" does not exist\nLINE 1: INSERT INTO \"resultregistration_competition\" (\"competition_c...\nOf course, I assume something is wrong with the migrations. However, I have run python manage.py makemigrations appname, and python manage.py migrate appname, and that works fine. I get a message that there are \"No changes detected\", and \"No migrations to apply\".\nI have tried solutions posted on SO, but none of them worked. \nWhat is the general reason for this error? And does anyone know what could be wrong in this specific case? Could one get this error if something is wrongly defined in the model? Or does it have to be a migration problem?\nThank you so much! Any help would be truly appreciated. Also, I am using PostgreSQL, if that helps.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":688,"Q_Id":46828251,"Users Score":3,"Answer":"Make sure you have _ init _.py file under the migrations folder for that paticular app. \nRunning manage.py makemigrations always makes a migration file if there are any changes in your models.py\n\nIf nothing works and there isnt much data present in your database, end resolution is to delete all migrations files (if any) for that app or for the project, in terminal type \"sudo -su postgres\" then type \"psql\".\nDrop your database and create a new one. Run manage.py makemigrations to check if migration file has been created or not. Then migrate with manage.py migrate","Q_Score":1,"Tags":"python,django,postgresql,database-migration","A_Id":46828778,"CreationDate":"2017-10-19T10:52:00.000","Title":"ProgrammingError in Django when adding a new model-instance to the Database, what could be wrong?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"one more problem i hv,i asked similar question earlier and i tried that method but not able use that methon in this problem so pls help me. it's element\nhtml code is - Filters\u00a0\nSo basically, question is that there is one button its kind of toggle button and i want click on that button to select device like Desktop, Tablet & Mobile all check boxes are already (default) selected now i have to uncheck or deselect device, to do this, first i have to click on that toggle button , when i click on toggle button its id (gwt-uid-598) 598 is getting changed every time or every refresh. Can you pls help me, what should or which method should i follow in this case.\ni am using below python code.\nClick on device Filters\nelem = driver.find_element_by_xpath('\/\/*[@id=\"gwt-uid-598\"]\/div\/div\/span')\nelem.click()\nThanks in advance.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":400,"Q_Id":46844771,"Users Score":0,"Answer":"Good question. \nTry to use another selector, for example: css class or use xpath method contains(). \nExample: \/\/div[contains(text(), \"checkbox\")]\nI can help you if you can provide source code of the page or needed element.","Q_Score":1,"Tags":"python,css,selenium,selenium-webdriver,ui-automation","A_Id":46849694,"CreationDate":"2017-10-20T08:03:00.000","Title":"id of xpath is getting changed every time in selenium python 2.7 chrome","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am setting up the base for a django project, I have cloned a repo and I have just created a virtual environment for the project in the same directory.\nBut when I try to run the command pip install -r requirements.txt in the project directory I get this error:\n[Errno 2] No such file or directory: 'requirements.txt'\nI believe I'm just running it in the wrong directory, but I don't really know where I should run it. Do you have any idea where the file could be located?","AnswerCount":15,"Available Count":4,"Score":1.0,"is_accepted":false,"ViewCount":123318,"Q_Id":46854451,"Users Score":22,"Answer":"If you are using a virtual environment just use the following line.\npip freeze > requirements.txt\nIt commands to create the requirements file first.\nOr in dockerfile, RUN pip freeze > requirements.txt .","Q_Score":33,"Tags":"python,django,git,pip,virtualenv","A_Id":54682545,"CreationDate":"2017-10-20T17:36:00.000","Title":"pip install -r requirements.txt [Errno 2] No such file or directory: 'requirements.txt'","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am setting up the base for a django project, I have cloned a repo and I have just created a virtual environment for the project in the same directory.\nBut when I try to run the command pip install -r requirements.txt in the project directory I get this error:\n[Errno 2] No such file or directory: 'requirements.txt'\nI believe I'm just running it in the wrong directory, but I don't really know where I should run it. Do you have any idea where the file could be located?","AnswerCount":15,"Available Count":4,"Score":0.0,"is_accepted":false,"ViewCount":123318,"Q_Id":46854451,"Users Score":0,"Answer":"Check if you have requirements.txt file in the directory.\nand then run the following command.\npip install -r requirements.txt","Q_Score":33,"Tags":"python,django,git,pip,virtualenv","A_Id":61945907,"CreationDate":"2017-10-20T17:36:00.000","Title":"pip install -r requirements.txt [Errno 2] No such file or directory: 'requirements.txt'","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am setting up the base for a django project, I have cloned a repo and I have just created a virtual environment for the project in the same directory.\nBut when I try to run the command pip install -r requirements.txt in the project directory I get this error:\n[Errno 2] No such file or directory: 'requirements.txt'\nI believe I'm just running it in the wrong directory, but I don't really know where I should run it. Do you have any idea where the file could be located?","AnswerCount":15,"Available Count":4,"Score":0.0,"is_accepted":false,"ViewCount":123318,"Q_Id":46854451,"Users Score":0,"Answer":"Make sure the requirements.txt file is in the same folder where you are installing it using pip install -r requirements.txt","Q_Score":33,"Tags":"python,django,git,pip,virtualenv","A_Id":63977270,"CreationDate":"2017-10-20T17:36:00.000","Title":"pip install -r requirements.txt [Errno 2] No such file or directory: 'requirements.txt'","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am setting up the base for a django project, I have cloned a repo and I have just created a virtual environment for the project in the same directory.\nBut when I try to run the command pip install -r requirements.txt in the project directory I get this error:\n[Errno 2] No such file or directory: 'requirements.txt'\nI believe I'm just running it in the wrong directory, but I don't really know where I should run it. Do you have any idea where the file could be located?","AnswerCount":15,"Available Count":4,"Score":0.0,"is_accepted":false,"ViewCount":123318,"Q_Id":46854451,"Users Score":0,"Answer":"I had this problem, 3 years too late however move the req file into downloads and then try it again","Q_Score":33,"Tags":"python,django,git,pip,virtualenv","A_Id":65883165,"CreationDate":"2017-10-20T17:36:00.000","Title":"pip install -r requirements.txt [Errno 2] No such file or directory: 'requirements.txt'","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Django1.11.5 and I created makemessages.py file in \"my-app\/management\/commands\/\" directory to customise makemessages command.\nAnd I made it to execute this command by running \"python ..\/manage.py makemessages\" from my-app directory.\nBut I want to execute by \"django-admin makemessages -l ja\".\n(Running \"django-admin makemessages -l ja\" just executes default makemessages command)\nIs there any way to execute this customised command by running \"django-admin makemessages -l ja\"?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":401,"Q_Id":46860891,"Users Score":0,"Answer":"I believe it should work if you did all right. Take a look at this docs part:\n\nIn addition, manage.py is automatically created in each Django\nproject. manage.py does the same thing as django-admin but takes care\nof a few things for you:\n\nIt puts your project\u2019s package on sys.path.\n\nIt sets the DJANGO_SETTINGS_MODULE environment variable so that it points to your\nproject\u2019s settings.py file.\n\n\n\nCarefully check this two moments. Since your manage.py works as expected, you already added your app in INSTALLED_APPS (after that Django can find and override default management command).","Q_Score":0,"Tags":"python,django,django-admin,makemessages","A_Id":46861958,"CreationDate":"2017-10-21T07:05:00.000","Title":"Is there any way to execute custom makemessages command by running \"django-admin makemessages -l ja\"?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"If I'm just updating, say, my main.py file, is there a better way to update the app then running gcloud app deploy, which takes several minutes? I wouldn't think I need to completely blow up and rebuild the environment if I'm just updating one file.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":50,"Q_Id":46867161,"Users Score":1,"Answer":"You must redeploy the service. App Engine isn't like a standard hosting site where you FTP single files, rather you upload a service that becomes containerized that can scale out to run on many instances. For a small site, this might feel weird, but consider a site serving huge amounts of traffic that might have hundreds of instances of code running that is automatically load balanced. How would you replace that single file in that situation across all your instances? So you upload a new version of a service and then you can migrate traffic to the new version either immediately or ramped up. \nWhat you might consider an annoyance is part of the tradeoff that makes App Engine hugely powerful in not having to worry about how your app scales or is networked.","Q_Score":0,"Tags":"python,google-app-engine","A_Id":46868601,"CreationDate":"2017-10-21T19:25:00.000","Title":"How can I update one (or a couple) files in a Google App Engine Flask App?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a 5 applications(programmed in 5 different languages) deployed in one common web server and these applications are written to work on a particular task and create a log file for any action. How can we achieve a security of log file by not being over written by other applications?","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":35,"Q_Id":46871459,"Users Score":1,"Answer":"First of all, if you don't trust one application to not clobber the log file of another one, then you have a really serious problem.  `Cos the applications could also do other more harmful things.  If the applications are believed to be insecure or untrustworthy, the most secure answer is to not run them at all.\nIf you are concerned that applications might accidentally write to the same log file1, just configure them to use different log file names or different log file directories2.\nIf you are simply trying to secure the logging, then one solution is to do your logging via an independent (secure) logging service such as Linux syslog.\nAnother approach is to create separate accounts for running each of the applications, and make sure that you set the file and directory access so that one application doesn't have permission to modify another's log file.\n\n1 - Actually applications can safely write to the same file if they all open the logfile in \"append\" mode.  Log file rotation could be problematic though.\n2 - You've probably already thought of that.","Q_Score":0,"Tags":"javascript,java,python,asp.net,angularjs","A_Id":46871523,"CreationDate":"2017-10-22T07:14:00.000","Title":"Applications \/ code security","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a 5 applications(programmed in 5 different languages) deployed in one common web server and these applications are written to work on a particular task and create a log file for any action. How can we achieve a security of log file by not being over written by other applications?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":35,"Q_Id":46871459,"Users Score":0,"Answer":"If your logs are stored in a commong log folder, then a simple solution would be to have proper naming for logs of different applications\ne.g.\n\npythonApp_log_timestamp\naspNetApp_log_timestamp\n\nThis way applications will write to its designated logs and not overwrite other application's log and would work irrespective of your hosting environment linux or windows.\nAlso you could limit the file size of each of the log file that your applications create, this way you could ensure that applications create new file if specified file size has been reached and not too much data is dumped into a single file, this will help in debugging or verifying the logs later. \nI use this method in my application and helps me find the log from specific duration and not searching logs too much.","Q_Score":0,"Tags":"javascript,java,python,asp.net,angularjs","A_Id":46872119,"CreationDate":"2017-10-22T07:14:00.000","Title":"Applications \/ code security","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Now that I have created a website, I wish the users can connect to my website within a local network. However my website now can only be accessible from the localhost (my pc), the others are not able to connect to my website when typing my ip address for example xxx.xxx.xxx.xxx:8000 on their browser. I launch the service on my localhost using # python manage.py runserver. May I know if there is a way\/command to allow the others to connect to my website?\nNote: I have tried # python manage.py runserver 0.0.0.0:8000 as well, which allow all incoming, but it didn't work.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":3829,"Q_Id":46909905,"Users Score":8,"Answer":"In settings.py write \nALLOWED_HOSTS = ['*'] and run python manage.py runserver 0.0.0.0:8000\nNote: you can use any port instead of 8000","Q_Score":3,"Tags":"python,django,server,web","A_Id":46910029,"CreationDate":"2017-10-24T11:54:00.000","Title":"How to allow others to connect to my Django website?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am writing a tool for internal use at work. A user enters a router or switch IP address, username and password into a web form. The app then uses pexpect to SSH into  the device, downloads a configuration and tests that the configuration complies with various standards by running true\/false tests (e.g. hostname is set). Leaving aside whether this is a good idea or not, my problem is that when I run the program under the Flask development program it works fine. When I set it up to run under WSGI it fails at the SSH portion with the error:\npexpect.exceptions.ExceptionPexpect: The command was not found or was not executable: ssh.\nI tried uWSGI and Unicorn and played with the number of workers etc. to no avail.\nI suspect this is a setuid root thing. Google searches do not point to a solution. Can anyone lead me to a fix? If pexpect will not work, I may give up and require the user to upload a config file they save themselves but I am frustrated that this works on the flask development server but not a production server.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":256,"Q_Id":46919968,"Users Score":0,"Answer":"You probably just need to replace ssh with its full path, e.g. \/usr\/bin\/ssh.\nYou can find the full path with which ssh.","Q_Score":1,"Tags":"python,flask,pexpect","A_Id":62195793,"CreationDate":"2017-10-24T21:03:00.000","Title":"Using python flask and pexpect works on flask development server fails with WSGI","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying a Django tutorial. For some reason my existing superuser got deleted; creating that went fine, but I can't make another one. This also happens when I try to use pip.\nI didn't change anything in the libraries so not sure why this happens now but didn't before. On windows 7 (Python 3.6.3 and Django 1.11). I've seen similar but not the exact same problems for Windows. Still I checked the file and there seems to be a PathLike class.\nI've also tried to repair my Python installation but it didn't help. any ideas?","AnswerCount":4,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":3463,"Q_Id":46920188,"Users Score":0,"Answer":"Update your Python and Django version and that will work perfect.","Q_Score":3,"Tags":"python,django,attributeerror","A_Id":64591309,"CreationDate":"2017-10-24T21:19:00.000","Title":"manage.py createsuperuser: AttributeError: module 'os' has no attribute 'PathLike'","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm trying a Django tutorial. For some reason my existing superuser got deleted; creating that went fine, but I can't make another one. This also happens when I try to use pip.\nI didn't change anything in the libraries so not sure why this happens now but didn't before. On windows 7 (Python 3.6.3 and Django 1.11). I've seen similar but not the exact same problems for Windows. Still I checked the file and there seems to be a PathLike class.\nI've also tried to repair my Python installation but it didn't help. any ideas?","AnswerCount":4,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":3463,"Q_Id":46920188,"Users Score":0,"Answer":"Seems like you may have modified the settings.py file. But as MrName mentioned you need to share full stack trace","Q_Score":3,"Tags":"python,django,attributeerror","A_Id":46932401,"CreationDate":"2017-10-24T21:19:00.000","Title":"manage.py createsuperuser: AttributeError: module 'os' has no attribute 'PathLike'","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am running a uwsgi application on my linux mint. it has does work with a database and shows it on my localhost. i run it on 127.0.0.1 IP and 8080 port. after that i want to test its performance by ab(apache benchmark).\nwhen i run the app by command uwsgi --socket 0.0.0.0:8080 --protocol=http -w wsgi and get test of it, it works correctly but slowly.\nso i want to run the app with more than one thread to speed up. so i use --threads option and command is uwsgi --socket 0.0.0.0:8080 --protocol=http -w wsgi --threads 8 for example. \nbut when i run ab to test it, after 2 or 3 request, my application stops with some errors and i don't know how to fix it. every time i run it, type of errors are different. some of errors are like these:\n\n(Traceback (most recent call last): 2014, 'Command Out of Sync')\n\nor \n\n(Traceback (most recent call last):   File \".\/wsgi.py\", line 13, in\n  application\n      return show_description(id)   File \".\/wsgi.py\", line 53, in show_description\n      cursor.execute(\"select * from info where id = %s;\" %id)   File \"\/home\/mohammadhossein\/myFirstApp\/myappenv\/local\/lib\/python2.7\/site-packages\/pymysql\/cursors.py\",\n  line 166, in execute\n      result = self._query(query)   File \"\/home\/mohammadhossein\/myFirstApp\/myappenv\/local\/lib\/python2.7\/site-packages\/pymysql\/cursors.py\",\n  line 322, in _query\n      conn.query(q)   File \"\/home\/mohammadhossein\/myFirstApp\/myappenv\/local\/lib\/python2.7\/site-packages\/pymysql\/connections.py\",\n  line 856, in query\n      self._affected_rows = self._read_query_result(unbuffered=unbuffered) 'Packet sequence number\n  wrong - got 1 expected 2',)   File\n  \"\/home\/mohammadhossein\/myFirstApp\/myappenv\/local\/lib\/python2.7\/site-packages\/pymysql\/connections.py\",\n  line 1057, in _read_query_result\n\nor \n\n('Packet sequence number wrong - got 1 expected 2',) Traceback (most\n  recent call last):\n\nor \n\n('Packet sequence number wrong - got 1 expected 2',) Traceback (most\n  recent call last):   File \".\/wsgi.py\", line 13, in application\n      return show_description(id)   File \".\/wsgi.py\", line 52, in show_description\n      cursor.execute('UPDATE info SET  views = views+1 WHERE id = %s;', id)   File\n  \"\/home\/mohammadhossein\/myFirstApp\/myappenv\/local\/lib\/python2.7\/site-packages\/pymysql\/cursors.py\",\n  line 166, in execute\n      result = self._query(query)\n\nPlease help me how to run my uwsgi application wiht more than one thread safety. any help will be welcome","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":238,"Q_Id":46927517,"Users Score":0,"Answer":"it has solved.\nthe point is that you should create separate connection for each completely separate query to avoid missing data during each query execution","Q_Score":0,"Tags":"python,multithreading,server,uwsgi","A_Id":47568008,"CreationDate":"2017-10-25T08:26:00.000","Title":"uwsgi application stops with error when running it with multi thread","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am a total noob with Django, I come from the PHP world and I am used to doing things differently.\nI'm building an app and I want to change the way the backend looks, I want to use Bootstrap 4 and add a lot of custom stuff e.g. permission based admin views, and I was wondering what is the best practice, or how do more experienced django devs go about it?\nDo they override all the django.contrib.admin templates, or do they build custom templates and login\/register next to it, and use the django.contrib.admin only for the superuser?\nWhat is the django way?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":451,"Q_Id":46941115,"Users Score":1,"Answer":"Django admin is intended for administration purposes. For all intents and purposes it is a direct interface to your database. While I have seen some people building customer facing interfaces using admin, this is most definitely not the way to make a general Django web application.\nYou should define views for your models. You can use built-in APIs to login and authenticate users. You should most likely restrict access to admin to internal users only.\nAs for templates, the modern way of doing things is to dynamically fetch data using an API and do all the UI logic in Javascript. Django can be used very well to provide an API to a frontend. Look into Django REST Framework. The basic idea is to write serializers for your models and have view functions serve the serialized data to the front end.\nYou could go the old school way and render your pages using templates of course. In that case your views would render templates using data provided by your models.","Q_Score":1,"Tags":"python,django","A_Id":46941490,"CreationDate":"2017-10-25T20:00:00.000","Title":"Overriding Django admin vs creating new templates\/views","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am a total noob with Django, I come from the PHP world and I am used to doing things differently.\nI'm building an app and I want to change the way the backend looks, I want to use Bootstrap 4 and add a lot of custom stuff e.g. permission based admin views, and I was wondering what is the best practice, or how do more experienced django devs go about it?\nDo they override all the django.contrib.admin templates, or do they build custom templates and login\/register next to it, and use the django.contrib.admin only for the superuser?\nWhat is the django way?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":451,"Q_Id":46941115,"Users Score":0,"Answer":"Yes. The admin pages is actually for administering the webpage. For user login and registration you create the templates. However, if you want your backend to look different then you can tweak the template for the admin page, admin login page as well. And you can also have permission based admin views. It's okay to over ride the defaults as long as you know what you're doing. Hope that helped.","Q_Score":1,"Tags":"python,django","A_Id":46941275,"CreationDate":"2017-10-25T20:00:00.000","Title":"Overriding Django admin vs creating new templates\/views","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"What do I need to do to make payments available with Stripe and Django using dj-stripe 1.0? I found the documentation quite unforgiving for a newcomer to dj-stripe. I think I have gleaned that most configuration of e.g. subscription plans are done at stripe.com and updated via webhooks to my application. However, what do I need to implement myself and how?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":208,"Q_Id":46958456,"Users Score":0,"Answer":"I think your question needs to be more specific, but I also struggled with Stripe's documentation on subscriptions and webhooks. Here is a bit of stuff I gleaned from multiple exchanges with their support:\nOnce you've set up the customer object, attached a payment source, and subscribed your customer to a plan, you won't need to take any further steps. Stripe will take care of creating the charges on the recurring basis that you've set.\nDespite stripe's recommendation of implementing webhooks as a best practice for subscriptions with Stripe, it is not required to continue billing. Billing is attempted automatically without the need to handle web hooks.\nHope that helps.","Q_Score":2,"Tags":"python,django,stripe-payments","A_Id":46962742,"CreationDate":"2017-10-26T15:39:00.000","Title":"How to get started with dj-stripe 1.0?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Simple question but couldn't find a clear answer anywhere. Do i have to create a new run\/debug configuration every time i create a new project, and assign the .py file at \"script\" or is there a way to make pycharm do this automatically. Would love to know! Thanks in advance :)","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":684,"Q_Id":46962868,"Users Score":2,"Answer":"You can run a .py file directly without manually creating a Run\/Debug Configuration. To do so, right click on the file in the Project view and select either the Run or Debug option from the context menu.","Q_Score":1,"Tags":"python,pycharm","A_Id":46962982,"CreationDate":"2017-10-26T20:04:00.000","Title":"Pycharm Run\/Debug Configuration saved as default","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"whenever I run something with pip in console on windows 10, it opens the javascript file 'cli.js'. i added python to my environment variables. python runs fine in console.\nand yes this all this was run in cmd + admin or powershell.\nAnybody that has an idea?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":94,"Q_Id":46969917,"Users Score":1,"Answer":"I had this issue because i had the npm module pip installed, removing this fixed my issue\nremove with npm uninstall pip","Q_Score":2,"Tags":"python-3.x,pip","A_Id":47573225,"CreationDate":"2017-10-27T07:42:00.000","Title":"running pip opens javascript file","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"We're creating an application to extract images from document where we'd be using MVC dot net for UI and job that extracts images and learn is in python. Here python batch would be on server and we're not sure whether MVC interaction with that batch would be possible directly or no. If not then I was thinking of WCF. But would like to explore other options as well which might be efficient. So, can Python batch have duplex communication with MVC dot net UI? If not which are the options to establish this?\nThanks","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":87,"Q_Id":46971103,"Users Score":2,"Answer":"Since your jobs will probably be long running, the best way would probably be to use some form of messaging (eg. RabbitMQ, Apache Kafka). A possible outline\n\nadd to MVC a tread\/process listening to a messaging queue\nAn image is added to MVC (or some other action happens, for which python should be notified)\nMVC sends a message to the python server.\npython learning system is notified, and updates its knowledge\nWhen done, it sends a message to back MVC, containing whatever results you need\n\nThe actual image could be passed from MVC to python\n\neither as binary data, inside the message itself\nor, written to a commonly accessed database, and the message to python contains just a notification (eg, the filename of the added image)\n\nIf you go with the shared database, make sure that MVC only writes and python only reads, otherwise you might face inconsistencies.","Q_Score":0,"Tags":"asp.net-mvc,python-3.x,machine-learning","A_Id":46971585,"CreationDate":"2017-10-27T08:53:00.000","Title":"MVC UI with python backend","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to iterate \/\/span[@class=\"postNum and contains(text(),1)] This xpath over the range of 1 to 10 and store it in a variable. I want it to be done in HTML format and not XML.\npseudo code:\nfor e in range(1,11):\n     xpathvar[e]='\/\/span[@class=\"postNum and contains(text(),e)]'\nhow to implement this so that xpathvar[1] will contain the first xpath with e=1. I cannot do this because the element in RHS is a string.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":204,"Q_Id":47011332,"Users Score":0,"Answer":"I solved it myself. What I wanted to do was with using slice, I wanted to traverse to all xpath using iteration where the iterative will be in digits coming from for loop.","Q_Score":0,"Tags":"python-3.x,xpath,lxml","A_Id":47045098,"CreationDate":"2017-10-30T09:01:00.000","Title":"How to iterate over a XPath in HTML format using lxml and python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to add new product.product fields to the default product.template view, problem is, that I've tried many examples, but none seems to be working.\nThe issue is that I do have added these fields to the product.product default view, (as an inherit view) BUT, that view is only available on sales module, the vast majority of the Odoo's product views are from product.template\nDoes anybody has an idea on how to achieve this on the xml view?\nIs it possible at all? Being product.product the model ?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1258,"Q_Id":47024145,"Users Score":3,"Answer":"You should add those fields to product.template model and then they will be automatically added to product.product by the inheritance. This way you will be able to show the fields in product.template views.\nI do not know what is the exact problem that you are trying to solve but when you need to add a field to a product you should think if its value is going to be different for each variant of the product (product.product are variants and product.template are the original product). If it is going to have the same value (You want to add it to product.template view so I imagine it is going to have it) then, add it to product.template model.\nI hope it helps you.","Q_Score":1,"Tags":"python,openerp,odoo-8","A_Id":57271414,"CreationDate":"2017-10-30T21:05:00.000","Title":"Add product.product fields to product.template view - Odoo v8","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Where to store payment gateway secret key when using python Django with apache server?\nI don't what to store in settings.py as i will checking this file in my git. \nCan i do it the same way amazon store AWS ec2 keys. If possible how to do it.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":112,"Q_Id":47038309,"Users Score":2,"Answer":"You can set secrets in environment variables and get them in python code as password = os.getenv('ENVNAME').","Q_Score":0,"Tags":"python,django,apache,amazon-ec2,ubuntu-14.04","A_Id":47038557,"CreationDate":"2017-10-31T14:52:00.000","Title":"Where to store payment gateway secret key when using python Django with apache server hosted on aws ec2 Ubuntu","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to make 'readonly' a single row of sale order line for particular condition. Can it is possible for a check box, if check box(is_pack) condition is true, than that row is readonly?\nThanks in advance.","AnswerCount":2,"Available Count":2,"Score":-0.1973753202,"is_accepted":false,"ViewCount":420,"Q_Id":47054052,"Users Score":-2,"Answer":"It is not possible to make readonly specific row (sale order line), because it is an one2many field and readonly attribute will apply on the field level not on record level. so in my openion you have to extend one2many field widget.","Q_Score":1,"Tags":"xml,python-2.7,odoo-10","A_Id":47055227,"CreationDate":"2017-11-01T11:43:00.000","Title":"Readonly a particular rows field value of sales order line for appropriate condition in odoo10","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to make 'readonly' a single row of sale order line for particular condition. Can it is possible for a check box, if check box(is_pack) condition is true, than that row is readonly?\nThanks in advance.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":420,"Q_Id":47054052,"Users Score":0,"Answer":"It is possible to make readonly a particular row for any condition.","Q_Score":1,"Tags":"xml,python-2.7,odoo-10","A_Id":47071806,"CreationDate":"2017-11-01T11:43:00.000","Title":"Readonly a particular rows field value of sales order line for appropriate condition in odoo10","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I don't know when and how it started but now I have such a glitch:\n\nopen CMD\nenter python command: \"django-admin.py help\"\nVisual Studio Code starts up and opens manage.py for editing.\nThe CMD command itself does not return anything.\non the other hand, if I enter: \"django-admin help\" (without .py)\nthe CMD shows help and VSCODE does not react in any way.\n\nWhat is this magic? How to change VSCODE reaction to .py mentioning?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":93,"Q_Id":47057011,"Users Score":1,"Answer":"It also happened to me, i tried creating a django project using django-admin.py startproject example, I asked around and i found out that the django-admin.py does not work on vscode for windows (am not really sure about mac), vscode sees it as a file and not as a command, cause vscode doesnt need the .py extension to execute the command.","Q_Score":0,"Tags":"python,django,visual-studio-code","A_Id":47057170,"CreationDate":"2017-11-01T14:18:00.000","Title":"VSCode starts up when I use \".py\" extension with CMD commands","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I will use Django translation functions\/tags to translate words and small block of text. But I am wondering whether it is relevant to do the same thing for big textual content like \"term of service\" or \"Privacy Policy\" pages ?\nI see 2 ways :\n1) use {% blocktrans %} on the whole text, but it will make a lot of data into the gettext database, it may slow down the translation process of all other strings\n2) use as many templates as languages, that is to have for the \"Privacy Policy\" page these kind of template files : privacy_en.html, privacy_fr.html, privacy_de.html...\nWhat would be the correct way ?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":97,"Q_Id":47061126,"Users Score":0,"Answer":"You have two options:\n\nuse blocktrans to translate it, it's fine you big text too. Gettext is caching it\nUse flatpages and put it there like \/tos\/en\/ or \/tos\/de\/ etc.\n\nboth are fine","Q_Score":0,"Tags":"python,django","A_Id":47061243,"CreationDate":"2017-11-01T18:08:00.000","Title":"Django translation strategy for big textual content","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Every AWS Account has an email associated to it. \nHow can I change that email address for that account using boto3?","AnswerCount":2,"Available Count":2,"Score":0.3799489623,"is_accepted":false,"ViewCount":494,"Q_Id":47063752,"Users Score":4,"Answer":"It is not possible to change an account's email address (Root) programmatically. You must log in to the console using Root credentials and update the email address.","Q_Score":0,"Tags":"python,amazon-web-services,email,boto3,amazon-iam","A_Id":47064014,"CreationDate":"2017-11-01T21:13:00.000","Title":"How can I change the AWS Account Email with boto3?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Every AWS Account has an email associated to it. \nHow can I change that email address for that account using boto3?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":494,"Q_Id":47063752,"Users Score":0,"Answer":"No as of Oct 2019 you can't update account information(including email) using boto or any other AWS provided SDKs.","Q_Score":0,"Tags":"python,amazon-web-services,email,boto3,amazon-iam","A_Id":58530022,"CreationDate":"2017-11-01T21:13:00.000","Title":"How can I change the AWS Account Email with boto3?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Here is a problem I am stuck with presently.\nRecently I have been exploring bokeh for plotting and kafka for streaming.\nAnd I thought of making a sample live dashboard using both of them.\nBut the problem is I use bokeh with python and kafka stream api's with Java. Is there a way to use them together by any chance.\nThe only way I can see is both of them can be used with scala. But presently I don't want to get into scala.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":824,"Q_Id":47069678,"Users Score":0,"Answer":"Try kafka-python. You can set up a simple consumer to read the data from your cluster.","Q_Score":0,"Tags":"java,python,apache-kafka,bokeh,apache-kafka-streams","A_Id":50312611,"CreationDate":"2017-11-02T07:20:00.000","Title":"Using bokeh plotting with kafka streaming","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Django 1.9.12 project running on EBS. I'd like to upgrade to Django 1.11 which I've done in the dev environment. How can I force EBS to update to 1.11? I hoped it might be a simple case of updating the requirements.txt but that hasn't worked with eb deploy\nWould it be easier just to create a new EBS project?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":89,"Q_Id":47074881,"Users Score":0,"Answer":"you should be able to do this no problem by updating the requirements.txt file.\nPlease post the error details you are getting and you requirements.txt file.","Q_Score":0,"Tags":"django,python-2.7,amazon-web-services,amazon-elastic-beanstalk","A_Id":47075247,"CreationDate":"2017-11-02T12:06:00.000","Title":"Upgrade Django installation on AWS elasticbeanstalk","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I created a django app with a celery task that organises database tables. The celery task takes about 8 seconds to do the job ( quite heavy table moves and lookups in over 1 million lines )\nThis celery starts through a button click by a registered user.\nI created a task-view in views.py and a separate task-url in urls.py. When navigating to this task-url, the task starts. \nMy Problem:\n\nWhen you refresh the task-url while the task is not finished, you fire up a new task.\nWith this set-up, you navigate to another page or reload the view\n\nHow do I prevent the task from firing up each time on refresh and prevent navigating to another page. Ideally, a user can only run one task of this particular type.\nMight this be doable with JQuery\/Ajax? Could some hero point me out in the right direction as I am not an expert an have no experience with JQuery\/Ajax.\nThanks","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1196,"Q_Id":47075629,"Users Score":2,"Answer":"\"How do I prevent the task from firing up each time on refresh\"\n\nFirst make sure you use the \"POST\/redirect\/GET\" pattern: your view should only fire the task on a \"POST\" request (GET request must not have side-effects), and then return a HttpResponseRedirect. \nThis won't prevent the user from firing a second task while the first is still running, but it does prevent re-submitting the form each time you refresh (\"GET\") the page...\n\nIdeally, a user can only run one task of this particular type.\n\nWhen firing a task, store it's id in the session, and before firing a task check the session for a task id. If there's one, use it to check the task's state. If it's done (whatever the result), remove the task id and proceed with the new task, else just display a message telling your user he already has a task running.\nJust make sure you correctly handle the case of a \"ghost\" task_id in the session (it might be a long finished task for which celery already discarded the results, or a task that got lost in a worker or broker crash - yeah, sh!t happens - etc). A working solution is to actually store a (timestamp, task_id) pair and if celery has no state for the task_id \n - actually \"no state\" is (mis)named celery.states.PENDING, which really means \"I don't have a clue about this task's state ATM\" - check the timestamp. If it's way older than it should then you can probably consider it as long dead and 6 feets under. \n\nand prevent navigating to another page. \n\nWhy would you want to prevent your user to do something else in the meantime, actually ? From a UI\/UX point of view, once the task is fired, your user should be redirected to a \"please wait\" page with (as much as possible) some progress bar or similar feedback. The simple (if a bit heavy) solution here is to do some polling using ajax : you setup a view that takes a task_id, check results \/ progress and returns them as json, and the 'please wait' page calls this views (using ajax) every X seconds to update itself (and possibly redirect the user to the next page when the task is done).\nNow if there are some operations (apart from re-launching the same task) your user couldn't do while a task is running, you can use the same \"check session for a current task\" mechanism for those operations (making it a view decorator really helps).","Q_Score":0,"Tags":"jquery,python,ajax,django,celery","A_Id":47076457,"CreationDate":"2017-11-02T12:43:00.000","Title":"run celery task only once on button click","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"when scraping from website using bs4 it showing response object as access denied and Forbidden how  to solve this?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":194,"Q_Id":47088034,"Users Score":0,"Answer":"Make sure that you have added the required headers such as 'User-Agent' before firing the get Request. In most cases, if 'User-Agent' is not provided, you'll end up with 403 response.","Q_Score":0,"Tags":"python-2.7,beautifulsoup","A_Id":47088273,"CreationDate":"2017-11-03T03:26:00.000","Title":"403 Forbidden or access denied for some website why?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a django view that takes in a json object and from that object I am able to get a uri. The uri contains an xml object. What I want to do is get the data from the xml object but I am not sure how to do this. I'm using django rest, which I am fairly inexperienced in using, but I do not know the uri until I search the json object in the view. I have tried parsing it in the template but ran into CORS issues amongst others. Any ideas on how this could be done in the view? My main issue is not so much parsing the xml but how to get around the CORS issue which I have no experience in dealing with","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":68,"Q_Id":47102090,"Users Score":0,"Answer":"You don't really do this in view part of Django. \nWhat you should do is take the json, find the uri, get the content of uri through urllib, requests etc, get the relevant content from the response, add a new field to the json and then pass it to your view.","Q_Score":0,"Tags":"python,django,xml,django-rest-framework","A_Id":47103539,"CreationDate":"2017-11-03T18:10:00.000","Title":"Getting data from a uri django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"As in the title, when running the appserver I get a DistributionNotFound exception for google-cloud-storage:\n\nFile \"\/home\/[me]\/Desktop\/apollo\/lib\/pkg_resources\/init.py\", line 867, in resolve\n      raise DistributionNotFound(req, requirers)\n  DistributionNotFound: The 'google-cloud-storage' distribution was not found and is required by the application\n\nRunning pip show google-cloud-storage finds it just fine, in the site packages dir of my venv.  Everything seems to be in order with python -c \"import sys; print('\\n'.join(sys.path))\" too; the cloud SDK dir is in there too, if that matters.\nNot sure what to do next.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1810,"Q_Id":47104930,"Users Score":0,"Answer":"The solution for me was that both google-cloud-storage and pkg_resources need to be in the same directory.\nIt sounds like your google-cloud-storage is in venv and your pkg_resources is in the lib folder","Q_Score":7,"Tags":"google-cloud-platform,google-cloud-storage,google-cloud-python","A_Id":65637184,"CreationDate":"2017-11-03T21:56:00.000","Title":"google-cloud-storage distribution not found despite being installed in venv","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"What is the difference between \"AWS Command Line Interface\" and \"AWS Elastic Beanstalk Command Line Interface\"? \nDo I need both to deploy a Django project through AWS Elastic Beanstalk?\nThank you!","AnswerCount":3,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":1072,"Q_Id":47106848,"Users Score":2,"Answer":"You should start with the EBCLI and then involve the AWSCLI where the EBCLI falls short.\nThe AWSCLI (aws) allows you to run commands from a bunch of different services, whereas, the EBCLI (eb) is specific to Elastic Beanstalk. The EBCLI makes a lot of tedious tasks easier because it is less hands on than the AWS CLI. I have observed, for most of my tasks, the EBCLI is sufficient; I use the AWS CLI and the AWS SDKs otherwise.\nConsider deploying your Django app.\n\nYou could start off by performing eb init, which would take you through an interactive set of menus, from which you would choose your region, and solution stack (Python).\nNext, you would perform eb create, which creates an application version and subsequently an Elastic Beanstalk environment for you.\n\nThe above two EBCLI steps translate to half a dozen or more AWSCLI steps. Furthermore, a lot of the processes that the EBCLI hides from you involve multiple AWS services, which can make the task of replicating the EBCLI through the AWS CLI all the more tedious and error-prone.","Q_Score":3,"Tags":"python,django,amazon-web-services,aws-cli,amazon-elastic-beanstalk","A_Id":47276695,"CreationDate":"2017-11-04T02:40:00.000","Title":"What is the difference between AWSCLI and AWSEBCLI?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"What is the difference between \"AWS Command Line Interface\" and \"AWS Elastic Beanstalk Command Line Interface\"? \nDo I need both to deploy a Django project through AWS Elastic Beanstalk?\nThank you!","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1072,"Q_Id":47106848,"Users Score":0,"Answer":"You only need eb to deploy and control Elastic Beanstalk. You can use aws to control any other resource in AWS. You can also use aws for lower-level control of Elastic Beanstalk.","Q_Score":3,"Tags":"python,django,amazon-web-services,aws-cli,amazon-elastic-beanstalk","A_Id":47106874,"CreationDate":"2017-11-04T02:40:00.000","Title":"What is the difference between AWSCLI and AWSEBCLI?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Everytime I make an external request (including to google.com) I get this response:\nHTTPConnectionPool(host='EXTERNALHOSTSITE', port=8080): Max retries exceeded with url: EXTERNALHOSTPARAMS (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x105d8d6d0>: Failed to establish a new connection: [Errno 8] nodename nor servname provided, or not known',))","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":138,"Q_Id":47116246,"Users Score":2,"Answer":"It does seem that your server cannot resolve the hostname into IP, this is probably not Django nor Python problem but your server network setup issue.\nTry to reach the same URL with ping tool \/ wget\/curl or troubleshoot DNS with nslookup.","Q_Score":0,"Tags":"python,django,python-2.7,python-requests","A_Id":47116517,"CreationDate":"2017-11-04T22:28:00.000","Title":"Django can't make external connections with requests or urllib2 on development server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I\u2019m using Flask on a Raspberry Pi for an IoT application.\nMy problem is, that I need to cleanly close the connection to my external device before the application is shutdown or restarted by the Flask auto-reloader.\nIs there any callback \/ handler \/ event \/ etc. I can use for a clean shutdown? (that also works with the auto-reloader)","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1206,"Q_Id":47116344,"Users Score":2,"Answer":"Application shutdown is not part of the WSGI server standard. There is no general way to know when the server stops completely from within the application code.","Q_Score":3,"Tags":"python,flask","A_Id":47116699,"CreationDate":"2017-11-04T22:41:00.000","Title":"Flask restart \/ shutdown callback","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am looking for some help knowing what to research\/look into for connecting an AWS Lambda function to a homemade server. \nI am building an Amazon Echo skill that uses AWS Lambda. The end goal is to have the Echo skill get information from my server and contribute to a database sitting on the server. I am using Nginx and Gunicorn to help serve my Flask application.\nAre there any tools or concepts I can look into to make this work? Currently, I am kind of lost and am seeing AWS Lambda and my server as two unique, silo-ed entities. But surely this isn't the case!\nThank you for your help!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":54,"Q_Id":47126418,"Users Score":3,"Answer":"You need to build an API on your server. Probably a REST API, or at least some HTTP endpoints on your Flask server that will accept some JSON data in the request. Then your Lambda function will make HTTP requests to your server to interact with it.","Q_Score":0,"Tags":"python,amazon-web-services,nginx,flask,aws-lambda","A_Id":47126544,"CreationDate":"2017-11-05T20:42:00.000","Title":"How do I connect AWS Lambda to homemade server?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In context of the following para :\nprs.slide_layouts is the collection of slide layouts contained in the presentation and has list semantics,\nat least for item access which is about all you can do with that collection at the moment.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":33,"Q_Id":47135747,"Users Score":1,"Answer":"The term semantics is sometimes used in a programming context to describe the set of behaviors an object has. So in this case, as Zero mentioned in his comment, it means \"has the same behaviors as a list\".\nYou could alternately interpret the phrase as \"is a list-like thing\" or \"is interacted with the same way you would a list object\".\nThe term semantics means \"meaning\". In the case of an object, its meaning comprises \"what you can do with it\" and how. In this case you can do \"list-like\" things with it, like iterate its members with for x in xs, get its length with len(xs), and access elements by index with xs[i].","Q_Score":0,"Tags":"python-3.x,python-pptx","A_Id":47142619,"CreationDate":"2017-11-06T11:18:00.000","Title":"What is a list semanitcs in python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have installed Python3 and pip3 on my Macbook pro. \nRunning python --version shows Python 3.6.3\nRunning pip --version shows pip 9.0.1 from \/usr\/local\/lib\/python3.6\/site-packages (python 3.6)\nhowever running aws --version shows aws-cli\/1.11.170 Python\/2.7.10 Darwin\/16.7.0 botocore\/1.7.28\nLooks like it's using python2. How do I fix this?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":3869,"Q_Id":47146493,"Users Score":2,"Answer":"Why is it really an issue?\nI assume you installed the AWS CLI tool by downloading the installer directly. If you want to \"fix\" it then uninstall the CLI tool, and then install it through pip with pip install awscli.","Q_Score":2,"Tags":"python,amazon-web-services,boto3,aws-cli","A_Id":47146546,"CreationDate":"2017-11-06T21:54:00.000","Title":"AWS CLI is using Python 2 instead of Python 3","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm trying to create a python script to help me manage my car radio's music library. The idea is the following: I have a USB flash drive with 2-hour podcast mp3 files. Since I never drive such long journeys, the script splits the files in 5-minute fragments and removes the originals.\nNow, the next thing I would want to do is automatically remove the ones I've already played. My first idea was something like DRM or a self-destructing file that erased itself once it's played, but from what I have found online that's pretty much impossible.\nSo, the question is, can I check with pydub if the file has been already played, so when I arrive home I can plug the USB in the computer, run the script, detect the played files and erase them?\nThanks and sorry if it's a dumb question!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":57,"Q_Id":47146728,"Users Score":0,"Answer":"No. Playing an audio file doesn't modify the file.\nUnless your car stereo writes some sort of log to the flash drive of what it's played -- which is unlikely; I've never seen or heard of a stereo that did that -- there's no way to determine which files have been played.","Q_Score":0,"Tags":"python,audio,pydub","A_Id":47147058,"CreationDate":"2017-11-06T22:13:00.000","Title":"Can pydub know if a file has ever been played?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am trying to create a python gui application where I need an MVC like pattern to display and control models. \nMy issue is that I will create and modify the models over time and I need to create several different \"view types\" (like a form view on one window and a map view on an other), each \"view type\" should be able to show each of my models. \nIf I use an MVC pattern (which I am not even sure is relevant), I should then create a view-controller for each of my model and \"view type\". \nSo if I create a new model, I will have to create a view-controller for each of the existing \"view types\", and if I want to create a new \"view type\" I will have to create a new view-controller for each model.\nCreating a generic view is hard because the models are quite independant and differents.\nIs there a good pattern or example I could use so I can make this smarter ? I'm stuck with this model \/ view design...\nThanks for ideas.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":74,"Q_Id":47155758,"Users Score":0,"Answer":"I believe you can this by using MVC. You don't have to create a lot of controllers for each model, you can just design GET-parameter like ?view= or specify endpoint to read view type and after this to handle it in a single controllers.","Q_Score":0,"Tags":"python,user-interface,design-patterns,model-view-controller","A_Id":47155904,"CreationDate":"2017-11-07T10:36:00.000","Title":"python application link models and views","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it possible to use Scrapy to generate a sitemap of a website including the URL of each page and its level\/depth (the number of links I need to follow from the home page to get there)? The format of the sitemap doesn't have to be XML, it's just about the information. Furthermore I'd like to save the complete HTML source of the crawled pages for further analysis instead of scraping only certain elements from it.\nCould somebody experienced in using Scrapy tell me whether this is a possible\/reasonable scenario for Scrapy and give me some hints on how to find instructions? So far I could only find far more complex scenarios but no approach for this seemingly simple problem.\nAddon for experienced webcrawlers: Given it is possible, do you think Scrapy is even the right tool for this? Or would it be easier to write my own crawler with a library like requests etc.?","AnswerCount":1,"Available Count":1,"Score":-0.1973753202,"is_accepted":false,"ViewCount":1378,"Q_Id":47160587,"Users Score":-1,"Answer":"Yes, it's possible to do what you're trying with Scrapy's LinkExtractor library. This will help you document the URLs for all of the pages on your site. \nOnce this is done, you can iterate through the URLs and the source (HTML) for each page using the urllib Python library. \nThen you can use RegEx to find whatever patterns you're looking for within the HTML for each page in order to perform your analysis.","Q_Score":5,"Tags":"python,scrapy,scrapy-spider","A_Id":61992037,"CreationDate":"2017-11-07T14:39:00.000","Title":"Sitemap creation with Scrapy","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"The purpose is to implement a pool like database connection pool in my web application. My application is write by Django.\nThe problem is that every time a http request come, my code  will be loaded and run through. So if I write some code to initiate a pool. These code will be run per http request. And the pool will be initiated per request. So it is meaningless.\nSo how should I write this?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":917,"Q_Id":47173204,"Users Score":0,"Answer":"Your understanding of how things work is wrong, unfortunately. The way Django runs is very much dependent on the way you are deploying it, but in almost all circumstances it does not load code or initiate globals on every request. Certainly, uWSGI does not behave that way; it runs a set of long-lived workers that persist across many requests.\nIn effect, uWSGI is already a connection pool. In other words, you are trying to solve a problem that does not exist.","Q_Score":0,"Tags":"python,django,web-applications,connection-pool","A_Id":47176595,"CreationDate":"2017-11-08T06:45:00.000","Title":"How to implement a connection pool in web application like django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"What's the difference between mod_wsgi and mod_python. \nIn order to publish django websites on VPS, which one should I install on VPS?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":363,"Q_Id":47175167,"Users Score":0,"Answer":"You should use mod_wsgi.  mod_python is the old and direct interface to Apache from Python. wsgi is a standard interface between any webserver and Python (mod_wsgi is the Apache implementation).","Q_Score":0,"Tags":"python,django,mod-wsgi,vps,mod-python","A_Id":47175245,"CreationDate":"2017-11-08T08:49:00.000","Title":"Django website on VPS with WHM CPanel","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working my django projects based on html form submission method .\nBut recently, I came to know that there exist django forms.\nPlease let me know what is the difference between them.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1130,"Q_Id":47184096,"Users Score":1,"Answer":"Writing a form in Django will ultimately produce a HTML form. The Django form can be bound to a model which will then apply validation to the form based on the model structure, this saves on having to manually code the validation and also helps keep everything aligned when changes are made to the model.","Q_Score":3,"Tags":"python,django,forms","A_Id":47184290,"CreationDate":"2017-11-08T15:54:00.000","Title":"what is the difference between Django form and html form","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a dictionary in Swift like so:\nlet params : [String : Any] =\n[\"user_key\": \"ag1kZXZ-Z29hbC1yaXNlchELEgRVc2VyGICAgICAgIAKDA\", \n \"post_text\": \"Lol\", \n \"trip\": [\"posted_by\": \"\", \n         \"endAddress\": \"\", \n         \"post_text\": \"Lol\", \n         \"startAddress\": [\"state\": \"IL\", \n                          \"city\": \"Oak Park\", \n                          \"address1\": \"6503 West North Avenue\", \n                          \"address2\": \"\", \"zipCode\": \"\"], \n         \"time\": \"\", \n         \"role\": \"\", \n         \"eta\": \"\"]]\nWhen I send this in the params object of Alamofire, the webapp2 accesses the params by self.request.get('user_key') and so forth, however, it does not get the 'trip' parameter. ```self.request.get('trip') returns nothing. \nHow do I send this dictionary to webapp2 Request Handler?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":56,"Q_Id":47190414,"Users Score":1,"Answer":"To access the trip dictionary you would need to use:\nclass CreateMediaPostTaskHandler(webapp2.RequestHandler):\n    def post(self):\n        params = self.request.params\n        start_address_city = params['trip[startAddress][city]']","Q_Score":1,"Tags":"python,alamofire,webapp2","A_Id":47213275,"CreationDate":"2017-11-08T21:59:00.000","Title":"How to send a dictionary through params webapp2 python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Can I keep my spot instance in use by modifying my max bid price pro-grammatically(Python boto) as soon as the bid price increases, so as to stop it from terminating itself and manually terminate it once am done with my work. I know I can use the latest spot block to use the spot instance upto 6 hours, but it reduces the profit margin. So I wanted to know if I can modify my bid pricing on the go based on the current demand. \nThanks.","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":2432,"Q_Id":47199421,"Users Score":5,"Answer":"No way ! You cannot change your max price once the instance is running. in order to change the price of your bid, you must cancel it and place another bid.","Q_Score":3,"Tags":"python,amazon-web-services,amazon-ec2,boto3","A_Id":47202059,"CreationDate":"2017-11-09T10:27:00.000","Title":"Changing max bid price of AWS Spot instance","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Can I keep my spot instance in use by modifying my max bid price pro-grammatically(Python boto) as soon as the bid price increases, so as to stop it from terminating itself and manually terminate it once am done with my work. I know I can use the latest spot block to use the spot instance upto 6 hours, but it reduces the profit margin. So I wanted to know if I can modify my bid pricing on the go based on the current demand. \nThanks.","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":2432,"Q_Id":47199421,"Users Score":1,"Answer":"No. It is not possible to change the bid price on an existing spot request. You will need to create a new spot request with the new bid price. However, any EC2 instances allocated with the first request will always be tied to that first request.\nIf your work cannot handle an EC2 instance terminating prematurely, then spot instances are not right for your work and you should use OnDemand or Reserved instances.","Q_Score":3,"Tags":"python,amazon-web-services,amazon-ec2,boto3","A_Id":47204123,"CreationDate":"2017-11-09T10:27:00.000","Title":"Changing max bid price of AWS Spot instance","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have 2 pc, PC A doesn't have errors and crawlers are deployed successfully, but on PC B, the error happens.\nMy Scrapyd server is running but then when I tried to deploy my crawlers, these error occurs.\n{\"status\": \"error\", \"message\":Traceback (most recent call last):\\\\n  File \\\"\/usr\/lib\/python2.7\/runpy.py\\\", line 162, in _run_module_as_main\\\\n    \\\"__main__\\\", fname, loader, pkg_name)\\\\n  File \\\"\/usr\/lib\/python2.7\/runpy.py\\\", line 72, in _run_code\\\\n    exec code in run_globals\\\\n  File \\\"\/usr\/local\/lib\/python2.7\/dist-packages\/scrapyd\/runner.py\\\", line 40, in <module>\\\\n    main()\\\\n  File \\\"\/usr\/local\/lib\/python2.7\/dist-packages\/scrapyd\/runner.py\\\", line 37, in main\\\\n    execute()\\\\n  File \\\"\/usr\/local\/lib\/python2.7\/dist-packages\/scrapy\/cmdline.py\\\", line 148, in execute\\\\n    cmd.crawler_process = CrawlerProcess(settings)\\\\n  File \\\"\/usr\/local\/lib\/python2.7\/dist-packages\/scrapy\/crawler.py\\\", line 243, in __init__\\\\n    super(CrawlerProcess, self).__init__(settings)\\\\n  File \\\"\/usr\/local\/lib\/python2.7\/dist-packages\/scrapy\/crawler.py\\\", line 134, in __init__\\\\n    self.spider_loader = _get_spider_loader(settings)\\\\n  File \\\"\/usr\/local\/lib\/python2.7\/dist-packages\/scrapy\/crawler.py\\\", line 330, in _get_spider_loader\\\\n    return loader_cls.from_settings(settings.frozencopy())\\\\n  File \\\"\/usr\/local\/lib\/python2.7\/dist-packages\/scrapy\/spiderloader.py\\\", line 61, in from_settings\\\\n    return cls(settings)\\\\n  File \\\"\/usr\/local\/lib\/python2.7\/dist-packages\/scrapy\/spiderloader.py\\\", line 25, in __init__\\\\n    self._load_all_spiders()\\\\n  File \\\"\/usr\/local\/lib\/python2.7\/dist-packages\/scrapy\/spiderloader.py\\\", line 47, in _load_all_spiders\\\\n    for module in walk_modules(name):\\\\n  File \\\"\/usr\/local\/lib\/python2.7\/dist-packages\/scrapy\/utils\/misc.py\\\", line 71, in walk_modules\\\\n    submod = import_module(fullpath)\\\\n  File \\\"\/usr\/lib\/python2.7\/importlib\/__init__.py\\\", line 37, in import_module\\\\n    __import__(name)\\\\n  File \\\"spiderman\/spiders\/scraper.py\\\", line 16, in <module>\\\\n    mail = input('Email : ')\\\\nEOFError: EOF when reading a line\\\\n\", \"node_name\": \"MY PC\"}","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":229,"Q_Id":47202472,"Users Score":0,"Answer":"You need to install the next packages:\n\napt-get update\napt-get install gcc\napt-get install python-dev\npip install scrapyd\npip install scrapyd-client\npip install beautifulsoup4\npip install dateparser\n\nAnd try to deploy again","Q_Score":0,"Tags":"python,ubuntu,scrapy,web-crawler,scrapyd","A_Id":54874106,"CreationDate":"2017-11-09T12:59:00.000","Title":"Scrapyd Deploy Error: EOFError: EOF when reading a line","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Currently I'm in the process of tagging every S3 bucket I have using boto3. Compared to a resource like Lambdas, doing s3.put_bucket_tagging overwrites any previous tags, compared to Lambdas which only add extra tags while keeping old ones. Is there a way to only add tags, rather than overwrite them?\nSecondly, I have created a method to take the current tags, add the new tags on, and then overwrite the tags with those values, so I don't lose any tags. But some of these S3 buckets are created by CloudFormation and thus are prefixed with aws: which gives me the error Your TagKey cannot be prefixed with aws: when I try to take the old tags and re-put them with the new tags. \nA fix for either of these to give me the ability to automate tagging of every s3 bucket would be the best solution.","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":1424,"Q_Id":47206395,"Users Score":2,"Answer":"You are out of luck. If the S3 bucket was created by a CFT, then\n\nYou cannot add new tags or \nAdd new tags and lose the tags created by CFT (then your delete stack will fail unless you exclude that S3 resource from deletion)\n\nYou can try updating the stack with new tags as suggested by @jarmod","Q_Score":2,"Tags":"python,amazon-web-services,amazon-s3,boto3","A_Id":47210265,"CreationDate":"2017-11-09T16:03:00.000","Title":"Using boto3 to add extra tags to S3 buckets","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have made several tables in a Postgres database in order to acquire data with time values and do automatic calculation in order to have directly compiled values. Everything is done using triggers that will update the right table in case of modification of values.\nFor example, if I update or insert a value measured @ 2017-11-06 08:00, the trigger will detect this and do the update for daily calculations; another one will do the update for monthly calculations, and so...\nRight now, everything is working well. Data acquisition is done in python\/Qt to update the measured values using pure SQL instruction (INSERT\/UPDATE\/DELETE) and automatic calculation are working. \nEverything is working well too when I use an interface like pgAdmin III to change values.\nMy problem comes with development in django to display and modify the data. Up to now, I did not have any problem as I just displayed data without trying to modify them. But now I don't understand what's going on...\nIf I insert a new value using model.save(), eveything is working: the hourly measure is written, the daily, monthly and yearly calculation are done.\nBut if I update an existing value, the triggers seem to not see the modification: the hourly measure is updated (so model.save() do the job), but the daily calculation trigger seems not to be launched as the corresponding table is not updated. As said previously, manually updating the same value with pgAdmin III works: the hourly value is updated, the daily calculation is done.\nI do not understand why the update process of django seems to disable my triggers...\nI have tried to use the old save algorithm (select_on_save = True), but without success.\nThe django account of the database is owning all the tables, triggers and functions. He has execute permission on all triggers and functions. And again, inserting an item with django is working using the same triggers and functions.\nMy solution for the moment is to use direct SQL instruction with python\/Qt to do the job, but I feel a bit frustrating not to be able to use only django API...\nDoes anybody have some idea to debug or solve this issue?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1413,"Q_Id":47209114,"Users Score":0,"Answer":"Problem was resulting from an error of time zone management.","Q_Score":0,"Tags":"python,django,postgresql,database-trigger","A_Id":47226539,"CreationDate":"2017-11-09T18:29:00.000","Title":"Issues with django and postgresql triggers","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Our customer wants us to create a report every month.\nIn the past, we used a @monthly cron job for this task.\nBut this is not reliable:\n\nThe server could be down in this minute. Cron does not re-run those jobs\nIf the server is up, the database could be unreachable in this moment.\nIf the server is up and DB is up, there could be a third party system which is not reachable\nThere could be a software bug.\n\nWhat can I do, to be sure that the report gets created monthly?\nIt is a Django based web application","AnswerCount":5,"Available Count":1,"Score":0.0399786803,"is_accepted":false,"ViewCount":1394,"Q_Id":47219945,"Users Score":1,"Answer":"Too many moving pieces and consequently options to consider. But problem 1 means you need some form of external way to track success (otherwise one option would have been for your server task - say a bash script - to keep retrying N times and sleeping in between retries, until the report generation is successful).\nIf you want a full-blown solution you can use for many different future needs, you can look into the available third party schedulers like Jenkins or SOS Berlin.\nIf you are looking for a simpler solution, you can schedule the report script via cron to run many times (say every hour for a few days at the end of the month), then have it keep track of whether the report was generated and sent successfully (this could be as simple as creating a file and checking for its existence, or writing a value to a database).","Q_Score":3,"Tags":"python,django,cron","A_Id":47220220,"CreationDate":"2017-11-10T09:51:00.000","Title":"@monthly cron job is not reliable","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to use Google's Custom Search Engine product to display results from a query on a page for a personal web app.\nHow CSE is working is that it takes parameters from the URL as search terms: i.e., www.mydomain.com\/results.html?q=hello+world would return results for a \"hello world\" query on the page. You put some JS code they give you on your page, so it's a bit of a black box.\nHowever, with URL routing and render() on Django, I'm guessing the basics is that www.mydomain.com\/results gets routed to a views.results calls which renders results.html as www.mydomain.com\/results.\nWhat is the best-practice for submitting a query through a form, and passing it to www.mydomain.com\/results.html?q=hello+world instead of redirecting to www.mydomain.com\/results and having Django render the results\/html file?\nSorry, I'm relatively new. I can try to piece things together, but I feel there has got to be a very efficient way of handling this situation. Thanks for understanding","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1022,"Q_Id":47228529,"Users Score":0,"Answer":"You're completely overthinking this. There's nothing different here from any other request: the form submits via GET to the results view, the view gets the search query from request.GET[\"q\"] or wherever, does the search and passes the results to the template.","Q_Score":0,"Tags":"python,django,url,url-routing,google-search","A_Id":47229387,"CreationDate":"2017-11-10T17:52:00.000","Title":"How to pass parameters into url after render() in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Background: I installed Python 3.5.2 on my Mac (which already contained 2.7.10) and have been apparently running the two installations side-by-side without any apparent issues. Everything works fine until I move the project folder somewhere else, and then when I try to do anything I get the following error:\nTraceback (most recent call last):\n  File \"manage.py\", line 8, in <module>\n    from django.core.management import execute_from_command_line\nImportError: No module named django.core.management\nMy normal setup workflow is as follows:\n\nInstall a virtual environment in the directory containing the Django project folder (not the directory containing manage.py - one level up from that) with python3 -m venv <venv-name>\nActivate the virtual environment and install Django, Pillow, whatever I need for the project.\n\nI know I'm missing something because I thought the way virtual environments worked was that you installed them locally and then as long as all of that accompanied your project folder, everything would be a-okay. But everything stops working when I move the directory, and if I move it back it works again. \nCan anyone tell me what kind of issue I'm dealing with here based on this? Is this just normal behavior and I just need to get used to not moving Django project folders?\nUPDATE: If I delete the virtual environment folder and re-install it once the folder is in the new location everything seems to work fine. I guess it's some issue with the creation of virtual environments and some kind of link to my Python installation? I have no idea.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":1389,"Q_Id":47230523,"Users Score":1,"Answer":"Late response, but I want to apport my workaround for this issue. Thanks to the Thomas response I understood the problem by looking at the activate script. So, was easier in my case restore the original path and follow these steps:\n\nBefore to move the project and with the virtual environment activated\npip freeze > requirements.txt\nThen deactivate the environment and remove it\ndeactivate\nrm -rf .env\nMove the project to the desired directory \nGenerate a fresh new virtual env and activate it\npython3 -m venv .env\nsource .env\/bin\/activate\nInstall the dependencies\npip install -r requirements.txt","Q_Score":2,"Tags":"python,django","A_Id":53996953,"CreationDate":"2017-11-10T20:20:00.000","Title":"Django not working after moving directory. Do I have a path\/Python installation issue?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"simple question I hope...\nI am getting 500 Internal Errors when developing and want to flash them to the browser screen for easier turn around time. Whats the easiest way to do this with Flask with Python?\nThanks.","AnswerCount":2,"Available Count":1,"Score":-0.0996679946,"is_accepted":false,"ViewCount":495,"Q_Id":47235597,"Users Score":-1,"Answer":"500 that means there something wrong in your demo.may as well put your error message","Q_Score":0,"Tags":"python,flask","A_Id":47235883,"CreationDate":"2017-11-11T07:39:00.000","Title":"Flashing 500 Internal Server Error to screen Flask with Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've got a google app engine application that loads time series data real-time into a google datastore nosql style table. I was hoping to get some feedback around the right type of architecture to pull this data into a web application style chart (and ideally something I could also plug into a content management system like Word Press).\nMost of my server-side code is python. What's a reasonable client-server setup to pull the data from the datastore database and display into my webpage? Ideally I'd have something that scales and doesn't cause an unnecessary number of reads on my database (potentially using google-app-engine's built in caching\/etc).\nI'm guessing this is a common use-case but I'd like to get an idea of what might be some best practices around this. I've seen some examples using client web side javascript\/ajax with server side php to read the DB- is this really the best way?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":70,"Q_Id":47254930,"Users Score":0,"Answer":"Welcome to \"it depends\".\nYou have some choices. Imagine the classic four-quadrant chart. Along one axis is data size, along the other is staleness\/freshness.\nIf your time-series data changes rapidly but is small enough to safely be retrieved within a request, you can query for it on demand, convert it to JSON, and squirt it to the browser to be rendered by the JavaScript charting package of your choice. If the data is large, your app will need to do some sort of server-side pre-processing so that when the data is needed, it can be retrieved in sufficiently fewer requests that that the request won't time out. This might involve something data dependent like pre-bucketing the time series.  \nIf the data changes slowly, you have the option of generating your chart on the server side, perhaps using matplotlib. When new data is ingested, or perhaps at intervals, spawn off a task to generate and cache the chart (or JSON to hand to the front-end) as a blob in the datastore. If the data is sufficiently large that a task will timeout, you might need to use a backend process. If the data is sufficiently large and you don't pre-process, you're in the quadrant of unhappiness.\nIn my experience, GAE memcache is best for caching data between requests where the time between requests is very short. Don't rely on generating artifacts, stuff them in memcache and hoping that they'll be there a few minutes later. I've rarely seen that work.","Q_Score":0,"Tags":"python,wordpress,google-app-engine,charts,google-cloud-datastore","A_Id":47257054,"CreationDate":"2017-11-12T22:55:00.000","Title":"Load chart data into a webapp from google datastore","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I use '#TODO: xxx' format for marking todo-s in Spyder. Is there any way to see full list of TODO-s in a file, in Spyder?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2523,"Q_Id":47256232,"Users Score":3,"Answer":"You have to go to the menu\nSource > Show todo list\nto get the full list of TODO's in your file.","Q_Score":3,"Tags":"python,ide,spyder","A_Id":47311970,"CreationDate":"2017-11-13T02:19:00.000","Title":"How to see list of #TODO-s in Spyder?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm developing a tourist web app with node.js and microservics.\nI need to develop a pricing service which will do all the calculation for the guest (price for night, taxes, VAT, discounts etc).\nMoreover, I need those calculation will be easy to dynamically change and control.\nFrom my past experience, doing those calcs in common web programming languages and\/or storing math formulas in the db end with a mess.\nAre there any alternative solutions for this? From what I read so far language like python, R or Java can fit to the job. However, is there any specific library within those which aimed for pricing?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":155,"Q_Id":47258026,"Users Score":0,"Answer":"@wizard I would share here something .\nIf you have complex calculation or any type of calculation do it in db end if feasible. \nThe best approach\npostgres\nto do this type of process is to make function (PL\\SQL) block . If you are using postgres create all calculation in postgres .\nThis is why node.js was design , no calculation in node.js end . \nmongodb\nif you are working with mongodb with this approach then i will recommend you to go with\nStored JavaScript in MongoDB","Q_Score":0,"Tags":"javascript,python,node.js,microservices,financial","A_Id":47258699,"CreationDate":"2017-11-13T06:07:00.000","Title":"implement financial microservice using node.js | python | R","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am interested in making a website that activates a python script. I am most familiar with c# but I have a python scraping script I would like to use that currently runs well on my raspberry pi.\nMy question is:\nHow do I make a C# asp.net website that activates the python script? what is the best approach? should i just forget c# all together and use something like django to host the site?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":28,"Q_Id":47270103,"Users Score":0,"Answer":"Considering how easy that is with something like django, I would go that route. Unless you're a C# wizard (I am most certainly not) or need it for something else.","Q_Score":0,"Tags":"c#,python,asp.net,django,raspberry-pi3","A_Id":47270170,"CreationDate":"2017-11-13T17:26:00.000","Title":"website to activate my python scraper using c# and possibly a raspberry pi","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I wish to monitor the CSS of a few websites (these websites aren't my own) for changes and receive a notification of some sort when they do. If you could please share any experience you've had with this to point me in the right direction for how to code it I'd appreciate it greatly. \nI'd like this script\/app to notify a Slack group on change, which I assume will require a webhook. \nNot asking for code, just any advice about particular APIs and other tools that may be of benefit.","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":197,"Q_Id":47319351,"Users Score":0,"Answer":"One possible solution:\nCrawl website for .css files, save change dates and\/or filesize. \nAfter each crawl compare information and if changes detected use slack API to notify. I haven't worked with slack that, for this part of the solution maybe someone else can give advice.","Q_Score":0,"Tags":"python,css,web,automation,bots","A_Id":47319389,"CreationDate":"2017-11-15T23:58:00.000","Title":"How to monitor changes to a particular website CSS?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I wish to monitor the CSS of a few websites (these websites aren't my own) for changes and receive a notification of some sort when they do. If you could please share any experience you've had with this to point me in the right direction for how to code it I'd appreciate it greatly. \nI'd like this script\/app to notify a Slack group on change, which I assume will require a webhook. \nNot asking for code, just any advice about particular APIs and other tools that may be of benefit.","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":197,"Q_Id":47319351,"Users Score":0,"Answer":"I would suggest using Github in your workflow. That gives you a good idea of changes and ways to revert back to older versions.","Q_Score":0,"Tags":"python,css,web,automation,bots","A_Id":47319375,"CreationDate":"2017-11-15T23:58:00.000","Title":"How to monitor changes to a particular website CSS?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"When I delete through the Console all files from a \"folder\" in a bucket, that folder is gone too since there is no such thing as directories - the whole path after the bucket is the key.\nHowever when I move (copy & delete method) programmatically these files through REST API, the folder remains, empty. I must therefore write additional logic to check for these and remove explicitly.\nIsn't that a bug in the REST API handling ? I had expected the same behavior regardless of the method used.","AnswerCount":1,"Available Count":1,"Score":0.537049567,"is_accepted":false,"ViewCount":1252,"Q_Id":47321613,"Users Score":3,"Answer":"Turns out that you can safely remove all object ending with \/ if you don't need them once empty. \"Content\" will not be deleted.\nIf you are using Google Console, you must create a folder before uploading to it. That folder is therefore an explicit object that will remain even if empty. Same behavior apparently when uploading with tools like Cyberduck.\nBut if you upload the file using REST API and its full path i.e. bucket\/folder\/file, the folder is implicit visually but it's not getting created as such. So when removing the file, there is no folder left behind since it wasn't there in the first place.\nSince the expected behavior for my use case is to auto-remove empty folders, I just have a pre-processing routine that deletes all blobs ending with \/","Q_Score":3,"Tags":"python,rest,google-cloud-storage","A_Id":47358658,"CreationDate":"2017-11-16T04:27:00.000","Title":"Empty 'folder' not removed in GCS","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to develop a native gear VR application in android studio using oculus native mobile SDK version 1.9.0. On running the VR samples enclosed within the SDK, I ran into the error mentioned below and the build failed. \n\nTraceback (most recent call last):\nFile \"C:\\ovr_sdk_mobile_1.9.0\\bin\\scripts\\build\\ovrbuild_keystore.py\", line 86, in \n      genDebugKeystore()\nFile \"C:\\ovr_sdk_mobile_1.9.0\\bin\\scripts\\build\\ovrbuild_keystore.py\", line 84, in genDebugKeystore\n      debug_props['storepass'], debug_props['keypass'], replace=False)\nFile \"C:\\ovr_sdk_mobile_1.9.0\\bin\\scripts\\build\\ovrbuild_keystore.py\", line 71, in create_keystore\n      return execfn(cmd)\nFile \"C:\\ovr_sdk_mobile_1.9.0\\bin\\scripts\\build\\ovrbuild_keystore.py\", line 82, in \n      create_keystore(lambda x: ovrbuild.call(x),\nFile \"ovrbuild.py\", line 169, in call\n      gradleTask = \"clean\" if command_options.should_clean else \"assembleDebug\" if command_options.is_debug_build else \"assembleRelease\"\n  NameError: global name 'command_options' is not defined\n:VrSamples:Native:VrTemplate:Projects:Android:genDebugKeystore FAILED\nFAILURE: Build failed with an exception.\n*Where:\n  Script 'C:\\ovr_sdk_mobile_1.9.0\\VrApp.gradle' line: 314\n*What went wrong:\n  Execution failed for task ':VrSamples:Native:VrTemplate:Projects:Android:genDebugKeystore'.\n  Process 'command 'C:\\ovr_sdk_mobile_1.9.0\/bin\/scripts\/build\/ovrbuild_keystore.py.bat'' finished with non-zero exit value 1\n\nCould anyone of you help me to solve this error?\nThis error is also present in oculus SDK version 1.7.0.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":330,"Q_Id":47321964,"Users Score":1,"Answer":"I was having the exact same problem. Same output and everything.\nAfter tracing the issue down for hours, I finally found my problem to be that my PATH did not include the java bin directory. The error was being caused because the keytool.exe program could not be reached.\nOn Windows 10, right click on This PC, select Advanced System Settings, select Environment Variables. In the System variables window on the lower half of the screen, find the Path variable. Ensure the java bin directory is in the list.\nIn my case I had to add:\nC:\\Program Files\\Java\\jdk1.8.0_112\\bin\nThe problem was not immediately corrected. I still had Android Studio open. I shut down the program and restarted the computer. After reboot and opening Android Studio again, everything started to build!\nHope this helps somebody else.","Q_Score":0,"Tags":"python,build,sdk,oculus","A_Id":48023152,"CreationDate":"2017-11-16T05:01:00.000","Title":"Build error in oculus native mobile sdk version 1.9.0","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm deploying a Django application as a deb file. The user is installing it using dpkg. When there is an update the user is installing it using dpkg and the application is updated.\nIn every install process the is user is loading the default data from fixtures automatically.\nConsider s\/he changed the default admin password. When s\/he updates the deb package the password is set to default.\nI have tried to check if there is an old version already intalled in the system. So I can pass over loaddata issues.\nHowever the solution I provided above is not a good solution. Does Django provides a mechanism or choice for this?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":106,"Q_Id":47324895,"Users Score":0,"Answer":"I have solved this problem by editing the installation script.\nIf it's not the installation or in other words the user is updating the loaddata is not run.\nI think the only solution is this instead of using migration.","Q_Score":0,"Tags":"python,django,python-3.x,python-2.7,django-models","A_Id":48651402,"CreationDate":"2017-11-16T08:30:00.000","Title":"How to prevent fixtures to update the DB in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm running an Ubuntu 16.04 VM on Google Compute Engine. I've created a static IP address <my_static_ip_address> and my firewall settings allow tcp:80-8888.\nI started the Jupyter server within the docker image with\njupyter notebook --ip=0.0.0.0 --port=8888 --no-browser --allow-root\n \nand got this URL\nhttp:\/\/0.0.0.0:8888\/?token=8b26c453d278eae1da71b80f26a4ef8ea06734e5c636d897\n\nI'm not able to access from external browser with http:\/\/<my_static_ip_address>:8888 \nWhat am I missing?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1502,"Q_Id":47335731,"Users Score":3,"Answer":"I started the Jupyter server within the docker image with\n\nWhat was the docker command you ran? A common gotcha here would be not mapping a host port to a container port. \nFor example, if you did this:\ndocker run -p 8888 jupyter\/notebook\nThen docker would assign a random host port mapping to port 8888 in the container. In this case, you can see what port was mapped by running docker ps. The port will be much higher than 8888 though, so you won't be able to reach jupyter because your firewall will block the traffic.\nWhat you probably want to do is go ahead and map a host port like so:\ndocker run -p 8888:8888 jupyter\/notebook\nThis should map any traffic reaching the GCE host on port 8888 to port 8888 in your jupyter container.","Q_Score":2,"Tags":"python,docker,virtual-machine,jupyter,gcp","A_Id":47336914,"CreationDate":"2017-11-16T17:25:00.000","Title":"Running Jupyter notebook in docker image on Google Cloud","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am new to python\/django\/pip. I created a virtualenv and I was in the bin dir when I did a pip install django. It created the django files there which is not what I wanted. So I did pip uninstall django. Then I created a folder called web in my virtualenv root and tried pip install again. This time it said loading from cache and installed django in bin folder again. So I deleted it and tried again with --no-cache-dir. This downloaded django fresh, but I am still finding the installation in bin directory! This is driving me crazy, how can I get it to install in the web directory?\nAny help much appreciated.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":801,"Q_Id":47370367,"Users Score":1,"Answer":"You can't tell pip where to install packages. There's a standard place for packages, and that's where it installs them. \npip makes sure it installs utilities (such as django-admin) in the path, so when the virtual environment is activated you can run it.","Q_Score":1,"Tags":"python,django,pip,virtualenv","A_Id":47370397,"CreationDate":"2017-11-18T19:52:00.000","Title":"Django not installing in folder where I want","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm making an elimination style voting website. People log in, vote for their least favorite participant, and at the end of the day the person with the most votes goes inactive. Almost everything works: The log in, the voting, etc. But I have no idea how to make a program that checks for the most votes and alters the database to change the status of a participant at a particular time without needing a user to enter the website. \nI don't even know where to put the code. And how would I make sure it's constantly running? The way I see it, views.py only works when a user goes to the URL, so if no one visited the website at the time of vote recopilation it wouldn't work, so that's a no no. I could make a script outside of the Django project that does this, and then run it with nohup &, but then I'd lose on the model notation and would have to make manual queries, plus I'm sure there's a better, more Django way to do this.\nAny solutions to this problem? Or maybe some direction you can point me in?","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":41,"Q_Id":47373656,"Users Score":0,"Answer":"The answer is django celery. Its for any tasks which need to be run with a condition. Look at the beats functionality for your use in celery","Q_Score":0,"Tags":"python,sql,django","A_Id":47373721,"CreationDate":"2017-11-19T04:22:00.000","Title":"How to make a code that alters database in background Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm making an elimination style voting website. People log in, vote for their least favorite participant, and at the end of the day the person with the most votes goes inactive. Almost everything works: The log in, the voting, etc. But I have no idea how to make a program that checks for the most votes and alters the database to change the status of a participant at a particular time without needing a user to enter the website. \nI don't even know where to put the code. And how would I make sure it's constantly running? The way I see it, views.py only works when a user goes to the URL, so if no one visited the website at the time of vote recopilation it wouldn't work, so that's a no no. I could make a script outside of the Django project that does this, and then run it with nohup &, but then I'd lose on the model notation and would have to make manual queries, plus I'm sure there's a better, more Django way to do this.\nAny solutions to this problem? Or maybe some direction you can point me in?","AnswerCount":3,"Available Count":2,"Score":0.0665680765,"is_accepted":false,"ViewCount":41,"Q_Id":47373656,"Users Score":1,"Answer":"If your scenario is just to update the database based on the number of votes, you can straight away go for cron.\nWrite a script that checks for the votes and changes the status of the user in the database. Schedule it in cron to run it once at the end of the day \/ poll.\nPlace the script in a directory that is not reachable by outsiders.\ncron entry for a script to run once a day at 23:30 hrs:\n30 23 * * * python \/root\/scripts\/status_change_script.py","Q_Score":0,"Tags":"python,sql,django","A_Id":47373793,"CreationDate":"2017-11-19T04:22:00.000","Title":"How to make a code that alters database in background Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm looking for a way to get the battery level in EV using OBD2 dongle,\nI manage to get the fuel level in Toyota and Ford but I need to get data from the battery management systems (BMS) on EV.\nI'm using python obd libraries and I have both comma.ai panda and OBDLink-LX dongles.\nthanks,\nAvi","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1579,"Q_Id":47377617,"Users Score":3,"Answer":"Some cars will report battery level on PID 0x5B of mode 1.","Q_Score":1,"Tags":"python,obd-ii","A_Id":47616373,"CreationDate":"2017-11-19T13:50:00.000","Title":"obd2 battery level on electric vehicle","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it possible to setup a VS Code to allow Quick Open (Cmd+P \/ Ctrl+P) a source file in current virtual env (outside my project folder)\nE.g. open a Django (or any other 3rd party) source file","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":25,"Q_Id":47408124,"Users Score":1,"Answer":"Since Visual Studio Code now supports multiple root workspaces, you could add your virtual environment to it. Then Quick Open will work.","Q_Score":0,"Tags":"python,navigation,visual-studio-code","A_Id":47408645,"CreationDate":"2017-11-21T08:10:00.000","Title":"Visual Studio Code Python: Quick open a file in $VIRTUAL_ENV","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to remove import button from my tree view and need to add edit button for tree view . How can I do that.. \nAlso I need to create button near create button in kanban view to go for another tree view. How can I do that... Please help me..","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":1705,"Q_Id":47412127,"Users Score":1,"Answer":"Its simple.. \nwe can make create='false' and edit='false' in tree view XML","Q_Score":1,"Tags":"javascript,xml,python-2.7,odoo-10","A_Id":49551211,"CreationDate":"2017-11-21T11:33:00.000","Title":"Remove Import Button in odoo tree view","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to remove import button from my tree view and need to add edit button for tree view . How can I do that.. \nAlso I need to create button near create button in kanban view to go for another tree view. How can I do that... Please help me..","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1705,"Q_Id":47412127,"Users Score":0,"Answer":"You need to extend the ListView (list_view.js) and change the method render_buttons. You can then render a custom template (you can use ListView.buttons template as a reference) with the buttons you need. \nYou can do the same for the KanbanView (kanban_view.js).","Q_Score":1,"Tags":"javascript,xml,python-2.7,odoo-10","A_Id":47417416,"CreationDate":"2017-11-21T11:33:00.000","Title":"Remove Import Button in odoo tree view","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Does anybody have the solution yet? The script was working perfectly fine until yesterday, but suddenly it stopped working. Don't know why.. :( \nI tried searching the answer all over Google, but didn't find yet.\nTried adding options.add_argument('--log-level=3') as well, but no luck.\nCan someone help me out with this?","AnswerCount":2,"Available Count":1,"Score":-0.0996679946,"is_accepted":false,"ViewCount":1868,"Q_Id":47439668,"Users Score":-1,"Answer":"What is going on here?  I've had this issue before and my solution was to uninstall and reinstall chrome and it worked fine.  But now, even uninstalling and reinstalling doesn't work and this 'Devtools listening...' line is popping up right away and my script doesn't work!\nEveryone seems to have the same experience with this message.  It's working fine for the longest time and then all of a sudden this message pops up and the script stops working?  Chrome has to be caching something somewhere.","Q_Score":0,"Tags":"python-3.x,google-chrome-devtools,selenium-chromedriver","A_Id":47486605,"CreationDate":"2017-11-22T16:31:00.000","Title":"Python selenium: DevTools listening on ws:\/\/127.0.0.1 keeps on popping up","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is there a way in one of the Django scripts to change the CTRL+BREAK exit command to something else when using \"python manage.py runserver?\"","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":16874,"Q_Id":47448510,"Users Score":17,"Answer":"Ctrl + C worked perfectly on PC","Q_Score":4,"Tags":"python,django,python-3.x","A_Id":56654583,"CreationDate":"2017-11-23T05:56:00.000","Title":"Change \"Quit the server with CTRL-BREAK.\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"For now, I'm trying to use flask-oauthlib with flask-login together.\nflask-oauthlib provides a simple way to use oauth, but I want a login manager to automatically redirect all users who are not logged in to \/login. In flask-login, I can use login_required to accomplish this. But how could I achieve this by flask-oauthlib?\nFurther, how to manage session when using flask-oauthlib? I understand how SSO works, but I'm confusing how could I know if this token is expired or not?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":504,"Q_Id":47449444,"Users Score":0,"Answer":"So, I've spent some time thinking about this (as I want to do it for my own website), and I've come up with a theoretical solution.\nFrom what I understand in my implementation of Google's OAuth API, OAuth is about sending the user on a link to the server that hosts the OAuth keys, and then returning back to the sender. So, my idea is that in the login form, you have buttons that act as links to the OAuth client.\nI haven't tested this, but since no one else has replied to this I figure this will give you a nice little project to implement yourself and let us know if it works.","Q_Score":1,"Tags":"python,flask,single-sign-on,flask-login,flask-oauthlib","A_Id":47532413,"CreationDate":"2017-11-23T07:04:00.000","Title":"How to use flask-oauthlib with flask-login together?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using the Python3, Django and database as Postgresql, and I wanted to use the Thingsboard dashboard in my web application. can anyone pls guide me how can I use this","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":304,"Q_Id":47454686,"Users Score":0,"Answer":"ThingsBoard has APIs which you can use. You may also customise it based on your requirements.","Q_Score":0,"Tags":"django,python-3.x,postgresql,mqtt,thingsboard","A_Id":47798648,"CreationDate":"2017-11-23T11:41:00.000","Title":"I am using the python django, and i wanted to know to get use thingsboard dashboard, and database as postgresql","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to convert a string acbdefrg into an array of individual letters [a,b,c,d,e,f,r,g]. I understand how it's done in python through list(your_string).\nHoever this code does not work in jinja2. Is this possible, or will I have to make the array in python and pass it over to jinja?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":375,"Q_Id":47466390,"Users Score":1,"Answer":"If you mean to just iterate through the string, you can explicitly make the array in python and pass it into jinja.\nTry to minimise logic in jinja as much as possible.","Q_Score":0,"Tags":"python,python-3.x,jinja2","A_Id":47466422,"CreationDate":"2017-11-24T04:30:00.000","Title":"Split string into individual charactor array in jinja2","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"After 30mins of not being used Heroju resets my django site, however when the site is reset the database\/models controlled and changed in the admin page are reset back to when the site was first uploaded. How do i stop this and make changes made in admin mode permanently to the site?\nthank you.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":40,"Q_Id":47477771,"Users Score":1,"Answer":"You are probably using sqlite as the database. You must not use that on Heroku, as it is stored on the ephemeral file system. Use the proper Postgres add-on.","Q_Score":0,"Tags":"python,django,python-3.x,heroku,hosting","A_Id":47478237,"CreationDate":"2017-11-24T17:22:00.000","Title":"Heroku and Django, database resets when heroku restarts the site","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Say I am parsing a listing page and generating a JSON output. At the end when all stuff is parsed, I want to run some operations on final scraped result. How can i do it in Scrapy? I know about process_item but it works for each item in iteration. The closed thing I found was close_spider but I am not sure that if I run scrapy crawl  spider whether it will give me JSON I created in closed_spider? If yes then how?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":135,"Q_Id":47478083,"Users Score":0,"Answer":"You could subclass the JsonItemExporter overwriting the finish_exporting method to process the final json file","Q_Score":0,"Tags":"python,scrapy,scrapy-spider","A_Id":47480292,"CreationDate":"2017-11-24T17:49:00.000","Title":"How to process final scrapers result in Scrapy?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Can someone example to me how CSRF works in the cluster setup?\nI have a kubernetes cluster hosting a django website, and I'm having some occasional issues with 403 errors. I have multiple instances of the site load balanced in kubernetes.\nHow does CSRF work when a POST is sent from 1 instance and handled by another?\nDoes CSRF site work if the docker images are updated during the time the form is being filled out?\nThanks!","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":723,"Q_Id":47479541,"Users Score":0,"Answer":"You should disable CSRF for every instance, and manage the CSRF security from the API Gateway","Q_Score":1,"Tags":"python,django,docker,kubernetes","A_Id":47479929,"CreationDate":"2017-11-24T20:19:00.000","Title":"Django CSRF in a cluster","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Can someone example to me how CSRF works in the cluster setup?\nI have a kubernetes cluster hosting a django website, and I'm having some occasional issues with 403 errors. I have multiple instances of the site load balanced in kubernetes.\nHow does CSRF work when a POST is sent from 1 instance and handled by another?\nDoes CSRF site work if the docker images are updated during the time the form is being filled out?\nThanks!","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":723,"Q_Id":47479541,"Users Score":1,"Answer":"Can someone example to me how CSRF works in the cluster setup?\n\nExactly the same way it usually ought not to (CSRF is Cross Site Request Forgery, i.e. the attack). To protect against it, you hand out secret tokens to your clients which they must include with subsequent requests. Your backend must validate that the tokens are valid, applicable and were, in fact, issued by a trusted source. There's a few ways to do that bit:\n\nYou can use MACs for that (in which case you have something pretty close to JSON WebTokens). \nYou can save your tokens to some trusted store and query that store on subsequent requests.\n\nThat is pretty much all there is to it.\nSince your CSRF protection emerges from the combination of choices you made above, how to make it work in a distributed setup also depends on the specific implementation of the CSRF protection scheme.\nGoing by the Django docs, the default way to do it uses a 'secret' which is reset every time a user logs in. That means if hitting a different server for two subsequent requests triggers a new log in, all old CSRF tokens are effectively invalidated. So based on that: \n\nYou need to adapt your Django project to make sure different instances can resume working with the same session, and a re-login is not triggered \nAll your Django instances need to be able to access the same per log-in secret, so that any one of them can validate a CSRF token issued by any other.","Q_Score":1,"Tags":"python,django,docker,kubernetes","A_Id":47479741,"CreationDate":"2017-11-24T20:19:00.000","Title":"Django CSRF in a cluster","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm seeing an error when running my tests, i.e. $ .\/manage.py test --settings=my.test.settings\ndjango.db.utils.ProgrammingError: relation \"<relation name>\" does not exist\nThis is after running .\/manage.py makemigrations && migrate.","AnswerCount":3,"Available Count":2,"Score":1.0,"is_accepted":false,"ViewCount":2724,"Q_Id":47517981,"Users Score":8,"Answer":"This error turns out (usually) to be caused, ultimately, by failing to create the initial migration for a new app. the error was resolved by running $ .\/manage.py makemigrations <my new app module name> && migrate\nNOTE: makemigrations DOES NOT AUTOMATICALLY CREATE THE INITIAL MIGRATION FOR NEW APPS","Q_Score":11,"Tags":"python,django,postgresql,django-rest-framework","A_Id":47517982,"CreationDate":"2017-11-27T18:58:00.000","Title":"Django test runner failing with \"relation does not exist\" error","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm seeing an error when running my tests, i.e. $ .\/manage.py test --settings=my.test.settings\ndjango.db.utils.ProgrammingError: relation \"<relation name>\" does not exist\nThis is after running .\/manage.py makemigrations && migrate.","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":2724,"Q_Id":47517981,"Users Score":0,"Answer":"In case you faced this issue while using pytest-django package, check that your haven't created new migrations with --reuse-db option in your pytest.ini","Q_Score":11,"Tags":"python,django,postgresql,django-rest-framework","A_Id":69928458,"CreationDate":"2017-11-27T18:58:00.000","Title":"Django test runner failing with \"relation does not exist\" error","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"how to make ensure one active session per one user using python flask?\nDescription: if one user logged in two different machines with same credentials\nI want  mechanism to force logout earlier active sessions of that user with flask and python. Please help me out in this.\nI am currently using flask-login, load_user() and login_manager libraries for login mechanism.","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":821,"Q_Id":47525351,"Users Score":2,"Answer":"One way for ensuring this would be by generating a session id from server. You would need to generate a unique session id every time a user logs in and store it in some database against that user. Apart from this you would need to authenticate user every time an endpoint call, which requires user to be logged in, is made. And of course discard the session id on logout.\nThis way whenever a user logs in the old session id is discarded and the previous session no more remains valid.","Q_Score":0,"Tags":"python,session,flask,flask-login","A_Id":47525555,"CreationDate":"2017-11-28T06:36:00.000","Title":"how to make ensure one active session per one user using python flask?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have JS running and essentially getting user entries from my HTML session storage and pushing these to a DB. I also need to use a HTTP request to pass a json object containing the entries to a python file hosted somewhere else. \nDoes anyone have any idea of documentation I could look at, or perhaps how to get JSON objects from JS to Python. \nMy client does not want me to grab the variables directly from the DB.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":37,"Q_Id":47535356,"Users Score":0,"Answer":"You have to create some sort of communication channel between the javascript and python code. This could be anything, SOAP, HTTP, RPC, any number of and flavor of message queue.\nIf nothing like that is in place, it's quite the long way around.  A complex application might warrant you doing this, think micro services communicating across some sort of service bus.   It's a sound strategy and perhaps that's why your client is asking for it.\nYou already have Firebase, though! Firebase is a real-time database that already has many of the characteristics of a queue. The simplest and most idiomatic thing to do would be to let the python code be notified of changes by Firebase: Firebase as service bus is a nice strategy too!","Q_Score":0,"Tags":"python,html,json,node.js,firebase-realtime-database","A_Id":47537413,"CreationDate":"2017-11-28T15:36:00.000","Title":"How do you pass variables using a HTTP post from a JS file\/function to a separate python file\/function hosted somewhere else?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Can you help me with a script for autoclicking and download a photo from a photo site (ex. Flickr, Photobucket)?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":38,"Q_Id":47539225,"Users Score":1,"Answer":"selenium, find elementByName, then use pynput lib to right click and download.\nused similar for fetching market data works prety well, refer to official selenium docs for spesifics .","Q_Score":0,"Tags":"python","A_Id":69762672,"CreationDate":"2017-11-28T19:14:00.000","Title":"Python script for autoclicking and downloading","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"While developing a Django project tracking it with git and GitHub, how should I manage migrations?\nSometimes when I deploy a release to production some migrations crash due to files that I delete after this migration.\nHow can I avoid this?\nThanks.","AnswerCount":1,"Available Count":1,"Score":0.537049567,"is_accepted":false,"ViewCount":289,"Q_Id":47539882,"Users Score":3,"Answer":"There is other threads on this but basically this is the rules I use:\n\nYou should definately remote migrations files using Git.\nNever run makemigrations on production environment always in developpment.\n\nNow, let's say you made a change on one of your models (in developpment I hope), you will run a normal makemigrations. Then, run migrate (still in dev) in order to test everything. When you're ready, you will commit and push the created files and pull in prod to then run migrate to update database schema. \nThis will assure good versionning of your migrations files. Also, it will greatly help you in the long run, because running makemigrations in produciton and in dev simultaneously will just cause more conflicts on migrations files which can be a pain.","Q_Score":2,"Tags":"python,django","A_Id":47540567,"CreationDate":"2017-11-28T19:55:00.000","Title":"Django project: track migrations","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"To my understanding \"import package.module\" is same as \"from package import module\". But this is not behaving as expected in case of BeautifulSoup. \nfrom bs4 import BeautifulSoup: This command works fine.\nBut,\nimport bs4.BeautifulSoup throws the following error\nModuleNotFoundError: No module named 'bs4.BeautifulSoup'\nAny thoughts\/help on this?","AnswerCount":2,"Available Count":2,"Score":0.1973753202,"is_accepted":false,"ViewCount":5300,"Q_Id":47545740,"Users Score":2,"Answer":"As colorspeed pointed out above, BeautifulSoup is a class therefore import bs4.BeautifulSoup will result in error. Instead use the syntax from bs4 import BeautifulSoup.","Q_Score":1,"Tags":"python,beautifulsoup,importerror","A_Id":47547367,"CreationDate":"2017-11-29T05:33:00.000","Title":"Import BeautifulSoup","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"To my understanding \"import package.module\" is same as \"from package import module\". But this is not behaving as expected in case of BeautifulSoup. \nfrom bs4 import BeautifulSoup: This command works fine.\nBut,\nimport bs4.BeautifulSoup throws the following error\nModuleNotFoundError: No module named 'bs4.BeautifulSoup'\nAny thoughts\/help on this?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":5300,"Q_Id":47545740,"Users Score":0,"Answer":"import bs4.BeautifulSoup will work when we have another file like thing in your bs4 package however BeautifulSoup is a class from that package so it cannot be called the way you are calling it.\nExample I have a package name Twitter and there is a sub package called twitter-api then I can call it as import Twitter.twitter.api\nSimilarly, if I have package name Twitter and there is a class inside that package with name twitter-api then I have to call it from Twitter import twitter-api","Q_Score":1,"Tags":"python,beautifulsoup,importerror","A_Id":66036064,"CreationDate":"2017-11-29T05:33:00.000","Title":"Import BeautifulSoup","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"In a project, I'm implementing using Django framework, I have two applications:\n\nApplication responsible for REST API, containing production models.py file.\nApplication responsible for Web client, that uses REST API's models.\n\nBoth of them contain vast static files and hierarchy of additional source code, that is why it came to my mind to split this responsibilities into two apps, rather than different views.py and urls.py files inside of one application.\nBecause application responsible for Web relies entirely on REST API's models is it a good practice to delete models.py file from this application entirely?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":24,"Q_Id":47564580,"Users Score":1,"Answer":"The file is only generated for your convenience. If you don't need it, there's no reason to keep it. No part of Django relies on it being present.","Q_Score":0,"Tags":"python,django,theory","A_Id":47564916,"CreationDate":"2017-11-30T01:42:00.000","Title":"Deleting 'models.py' from Django app","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using pypdf2 to highlight text in a particular page in Pdf files.Hence,I get only a single page with higlighted text as an output.Now,I want to replace this page in the original pdf file.\nI have also tried \"search=\" parameter from abode to highlight in the same file itself.But,It is not working.\nI am new to working  with PDFs.Sorry,If the question sounded a bit naive.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":609,"Q_Id":47566623,"Users Score":0,"Answer":"Get a word processor or page layout software. Convert PDF to format your software can read. Edit document. Write new PDF.\nAnything else sounds nefarious. Nobody should help you do it any other way.","Q_Score":0,"Tags":"python,python-3.x,pypdf2","A_Id":47566749,"CreationDate":"2017-11-30T05:44:00.000","Title":"Replace a Specific page in a PDF with a page from another PDF in python 3","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an HTML web page with many download links in a table. I have isolated the path to my desired zips. They all contain an .xlsx file but sometimes other files. \n\nIs there a way to avoid downloading the zips and directly accessing the files inside?\nIf I do need to download them, how can I track where the zips have been downloaded to? (So I can extract the .xlsx)\n\nI am currently looking into zipfile and requests for solutions. zipfile.extract needs the path of the zip file, but I don't know exactly where the script will download to. requests gives a response object, but how do I prompt it to download?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":35,"Q_Id":47572918,"Users Score":1,"Answer":"Is there a way to avoid downloading the zips and directly accessing the files inside?\n\nGenerally speaking : no. A web server serves files in a file system, not in a zip archive.\n\nIf I do need to download them, how can I track where the zips have been downloaded to? (So I can extract the .xlsx)\n\nIf not specified, the location is the current directory, the one the script has been launched in.","Q_Score":0,"Tags":"python,python-3.x,python-requests,zip","A_Id":47573727,"CreationDate":"2017-11-30T11:54:00.000","Title":"unzipping an html link with python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm currently working with some people to develop an application that will display a \"sound library\" when the user selects an option on their voip phone. The idea is that the phone system will pass a url with a device id in it, and that will open the django app to the users' library. I was told to remove login\/user authentication in order to make the process easier for the user. My question is, is there a way to create a user field and save the model for future retrieval via the url request alone? Do I need to pass the device id to some hidden form first and redirect to the main page, and query the users' objects via the device id? I know there are security concerns but was wondering if it's even possible, any help is appreciated!","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":77,"Q_Id":47584413,"Users Score":1,"Answer":"You should try using Djago REST Framework, it will make it easy to retrieve data with urls using unique identifier.","Q_Score":0,"Tags":"python,django,authentication,url","A_Id":47584549,"CreationDate":"2017-11-30T23:36:00.000","Title":"Django create user account via URL","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"ng serve command runs a server instance on a localhost. I would like to use some server-side scripts on the same localhost and communicate between angular app and the http server.\nI have some issue by not knowing in which directory I should place Python scripts. So that I can run extend the functionality of Angular app, to gather data from localhost server?\nEDIT:\nI am visiting http:\/\/localhost:4200\/data.php in a browser, but I am always getting a 304 redirect. I figure this could be due to incorrect placing of php files. I've put it in src, ..src and app folder, but nothing seem to work.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":629,"Q_Id":47606914,"Users Score":0,"Answer":"Root directory if it is one or two files - like configs etc. \nIf you actually need a server side app maybe it's better to make that the root project and have angular in a view folder.","Q_Score":0,"Tags":"python,angular","A_Id":47606964,"CreationDate":"2017-12-02T10:30:00.000","Title":"Angular project and server files on localhost","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created login model in Django and I am using username for authentication(using default authenticate()), but at present the username is case-sensitive. Is there a way in django that while authenticating the case-sensitivity of username is not considered?","AnswerCount":1,"Available Count":1,"Score":0.537049567,"is_accepted":false,"ViewCount":1395,"Q_Id":47610890,"Users Score":3,"Answer":"You could lowercase or uppercase the username when someone register or login. \nFirst get the data from the form:\nusername = login_form.cleaned_data.get('user_username')\npassword = login_form.cleaned_data.get('user_password')\nAfter that lowercase the username:\nusername = username.lower()\nThen authenticate:\nuser = authenticate(username=username, password=password)\nRemember to lowercase the username in the register form too.","Q_Score":2,"Tags":"python,django","A_Id":47611173,"CreationDate":"2017-12-02T18:02:00.000","Title":"Authentication with case insensitive username","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have some problem with my database, so I deleted db.sqlite3 and Migrations manually. \nthan I recreate the database by using manage.py makemigrations <appname> manage. py migrate <appname> \nEverything looks normal\uff0cbut when I get into localhost:8000, It is a blank page without anything (even if I never change the templates).\nTo my confused, I can get into the admin page. \nAre there any mistakes in this process\uff1fwhat happened to my django app?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":558,"Q_Id":47615323,"Users Score":0,"Answer":"Now what you can do is : \n1) Take backup of your code\n2) Create another project with other name or same name, it will have it's own sqlite db\n3) Place your code in that project and then run migrations, it will recreate your db schema.\nAnd it should work.","Q_Score":0,"Tags":"python,django","A_Id":47616024,"CreationDate":"2017-12-03T04:43:00.000","Title":"After delete database ,my Django does't work","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"when should I write methods in the model itself and when in the model manager?\nis it like all methods to get something should be written in manager and others in model","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":120,"Q_Id":47621228,"Users Score":0,"Answer":"There's a simple difference. Model methods act on a single instance. Manager methods create queries to act on multiple instances.","Q_Score":0,"Tags":"python,django,django-models","A_Id":47622247,"CreationDate":"2017-12-03T17:40:00.000","Title":"when should I write custom methods in model vs model manager\/ queryset","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Just like the title. I was struggling to work with that, but I couldn't find any way to make that work.\nIs there anyone know how to do that. Please help, thanks!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":83,"Q_Id":47631328,"Users Score":0,"Answer":"Finally, this problem has been solved by changing the match-clients dynamically through ssh and then rndc reload. This make the remote server only access to the specific view in which you want to update the zone using dnspython.","Q_Score":0,"Tags":"python,view,dns,bind,dnspython","A_Id":47667697,"CreationDate":"2017-12-04T10:32:00.000","Title":"Is there any way to update zone in specific views using dnspython?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"when I define a new stage in zappa_settings.json a new api-gateway-backend gets created. What I would need is the same gateway but a different stage, ie. \/prod instead of \/dev.\nIs there any way of accomplishing this in zappa?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":605,"Q_Id":47651326,"Users Score":0,"Answer":"Zappa does not currently support that model.","Q_Score":1,"Tags":"python,aws-lambda,zappa","A_Id":47662032,"CreationDate":"2017-12-05T10:27:00.000","Title":"zappa deployment: deploy to same api gateway with different stages","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"When passing a JSON to Django views, it's supposed to be using POST. Using GET will append a long URL that would throw a long URI error. \nI am trying to implement a filter on objects in JSON type of functionality using ajax. I have two filter options, by text and by dropdown, where the users can filter one or the other or both.\nTo do this I pass these two data using GET. \nSo essentially its:\n\nJSON : POST\nfilter1 & filter2 : GET\n\nThe main problem is, where I can't keep the POST-ed json (ofcourse, since its POST) but its also unconventional to make a global variable in Python (not like in Java) so I can't keep it until GET gets called so the filters passed can use it on those objects (not directly from the models).\nThank you so much in advance for giving suggestions!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":95,"Q_Id":47652443,"Users Score":0,"Answer":"Django Maintain Session in a very good way you can use Django Session Variables there Or u Can Pass the filter data in Post along with your data","Q_Score":0,"Tags":"jquery,python,json,ajax,django","A_Id":47655518,"CreationDate":"2017-12-05T11:23:00.000","Title":"Django - JQuery AJAX : How to filter \"POST\"-ed json on \"GET\"?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created DJango Project inside virtual environment.\nLet's say virtual environment  DJangoProject project name is Mysite\nI am tired of running .\/manage.py runserver everytime so that I wanted to automate running server when I was logged into ubuntu.I tried many ways but was always failing to access the path of virtual environment. So help me to  run manage.py runserver from outside of virtual environment using bash or shell scripting.\n any help can be appreciate!","AnswerCount":3,"Available Count":1,"Score":0.0665680765,"is_accepted":false,"ViewCount":1012,"Q_Id":47671602,"Users Score":1,"Answer":"You can't \"run manage.py runserver from outside of virtual environment\" if your project relies on a virtual environment... But nothing prevents you from writing a wrapper bash script that cd into your project's root, activate the virtualenv and launch the dev server. \nThis being said, I really don't see the point - and I even see a couple reasons to not do so, the first one being that you definitly want to keep the terminal where you run your dev server from opened so you can read all the logs in real time.","Q_Score":3,"Tags":"python,django,bash,manage.py,virtual-environment","A_Id":47673367,"CreationDate":"2017-12-06T10:06:00.000","Title":"Run DJango server from outside of virtual environment by using script","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Most documentation simply tells you to add the name of each of your apps to the INSTALLED_APPS array in your Django project's settings. What is the benefit\/purpose of this? What different functionality will I get if I create 2 apps, but only include the name of one in my INSTALLED_APPS array?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":4206,"Q_Id":47684387,"Users Score":21,"Answer":"Django uses INSTALLED_APPS as a list of all of the places to look for models, management commands, tests, and other utilities. \nIf you made two apps (say myapp and myuninstalledapp), but only one was listed in INSTALLED_APPS, you'd notice the following behavior:\n\nThe models contained in myuninstalledapp\/models.py would never trigger migration changes (or generate initial migrations). You wouldn't be able to interact with them on the database level either because their tables will have never been created.\nStatic files listed within myapp\/static\/ would be discovered as part of collectstatic or the test server's staticfiles serving, but myuninstalledapp\/static files wouldn't be.\nTests within myapp\/tests.py would run but myuninstalledapp\/tests.py wouldn't.\nManagement commands listed in myuninstalledapp\/management\/commands\/ wouldn't be discovered.\n\nSo really, you're welcome to have folders within your Django project that aren't installed apps (you can even create them with python manage.py startapp) but just know that certain auto-discovery Django utilities won't work for that application.","Q_Score":15,"Tags":"python,django","A_Id":47684488,"CreationDate":"2017-12-06T22:18:00.000","Title":"What is the purpose of adding to INSTALLED_APPS in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a python program appending lines to a .csv file every few seconds. I also have a web app that was created using Django. My goal is to continuously read the data from the python program as it runs and display it on the website without having to refresh.\nMy proposed solution is to send the python output to a server using requests.put(), and then read from the server using AJAX. \n1.) Is this the best solution, or is there a better manner to connect the program and the site.\n2.) If this is a good solution, what's the easiest way to get a server running to POST, PUT, and GET from? It can be local and will never expect heavy traffic.\nThank you!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":173,"Q_Id":47687046,"Users Score":0,"Answer":"Reading from csv is not good solution,message quene is suitable solution for this context\u3002\n\npython program can post a data message to django when adding lines\nto csv. \ndjango webapp can send data message to browser when getting\nmessage by SSE or socket.io lib","Q_Score":0,"Tags":"python,ajax,django,server","A_Id":47687089,"CreationDate":"2017-12-07T03:18:00.000","Title":"Sending data stream from python program to web app","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"The setup is using S3 as a storage, API gateway for the rest endpoint and Lambda (Python) for get\/fetch of file in S3.\nI'm using Boto3 for the Lambda function (Python) to check if the file exists in S3, and I was able to download it but being stored in Lambda machine (\"\/tmp\"). The API Gateway can trigger the lambda function already. Is there a way that once the lambda function is triggered then the download will happen in the browser? \nThanks!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":802,"Q_Id":47707185,"Users Score":0,"Answer":"Here is how we did it:\nCheck and Redirect:\nAPI Gateway --> Lambda (return 302) \nDeliver Content:\nCloudFront --> S3\nCheck for S3 existence with Lambda returning a 302 to cloudfront. You can also return Signed URL from Lambda with a valid time to access the URL from CloudFront.\nHope it helps.","Q_Score":1,"Tags":"python-3.x,amazon-web-services,amazon-s3,aws-lambda,aws-api-gateway","A_Id":47707562,"CreationDate":"2017-12-08T03:17:00.000","Title":"Retrieve a file from browser using API gateway, AWS LAMBDA and S3","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"If I have two backends, one NodeJS and one Python both of them are accessing the same database. Is it possible to use an ORM for both or is that really bad practice? It seems like that would lead to a maintenance nightmare.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":184,"Q_Id":47707608,"Users Score":0,"Answer":"It is possible, but it may cause conflicts with table names, constraint names, sequence names and other names which are depend on ORM naming strategy.","Q_Score":0,"Tags":"python,node.js,postgresql,orm","A_Id":47708755,"CreationDate":"2017-12-08T04:13:00.000","Title":"Node ORM and Python ORM for same DB?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"If I have two backends, one NodeJS and one Python both of them are accessing the same database. Is it possible to use an ORM for both or is that really bad practice? It seems like that would lead to a maintenance nightmare.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":184,"Q_Id":47707608,"Users Score":0,"Answer":"so long as both ORMs put few constraints on the database structure it should be fine.","Q_Score":0,"Tags":"python,node.js,postgresql,orm","A_Id":47708025,"CreationDate":"2017-12-08T04:13:00.000","Title":"Node ORM and Python ORM for same DB?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to create a web application using python which has a HTML form and the form data is used as a command line input to start an application. I know how to initiate the CLI tool from web app, but want a way to get the output of the CLI tool from Linux terminal real time and show it in the web application. \nThe CLI tool will run for a day and the terminal output will change in real time. Is there a way to display the changing Linux terminal output in to the web application. Information about any web terminal or way to get and store the real-time screen output of a linux application will be helpful.\nWhen ever the screen O\/P of the application running in linux changes then the web application should also be updated with the change. \nAny python lib or tools will be useful and easy to Integrate?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":515,"Q_Id":47709408,"Users Score":0,"Answer":"A quick solution I would do (without any libraries or stuff):\n\ninvoke your CLI program and set it up to continuously output to a file on the server. Make sure you know the file name.\nuse Ajax calls to fetch the output to the client. OR (if you are in for hard stuff) use a webSocket to output to the client.","Q_Score":1,"Tags":"html,linux,python-3.x,web,terminal","A_Id":47709772,"CreationDate":"2017-12-08T07:09:00.000","Title":"Getting a Linux terminal output of a CLI tool and displaying in Web page","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm currently working on a project, which will dynamically fetch some informations of my job and display them in a html page. To accomplish this i wrote a python script, which will be invoked using a PHP webservice. The script needs to edit some files in order to work.\nBasically PHP executes the script using \n $output = shell_exec('python script.py'); \nThe problem is, that if the webservice is called, the script does not have the needed permissions to edit the files.\nSo the webserver should call the script using something like  $output = shell_exec('sudo python script.py');  \nI may need to change the permissions to the project folder but i don't know how.\nSome additional informations:\nI'm using a raspberry pi 3 with LAMP installation on raspian as webserver\nThe folder structure is the following:\n\nprojectfolder \n| \n- style (containing css)\n-script.py\n-script2.py\n-filetoedit1.txt\n-filetoedit2.html\nAny help is appreciated!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":25,"Q_Id":47720160,"Users Score":0,"Answer":"As suggested by @wpercy you have figure out which user is executing the file. Usually that user is called  www-data !\nTo find out which user is calling the service use\n ps aux | grep -E '[a]pache|[h]ttpd|[_]www|[w]ww-data|[n]ginx' | grep -v root | head -1 | cut -d\\  -f1  \nAfter you figured out the user you have to change the permission for the folder. That command schould be something like  chown -R www-data:www-data \/var\/www\/html\/Projectfolder \nSpecial thanks to wpercy!","Q_Score":0,"Tags":"php,python,linux,webserver,file-permissions","A_Id":47720634,"CreationDate":"2017-12-08T18:23:00.000","Title":"Linux editing privilege over webservice","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Just started with Flask and Python yesterday so this may be a stupid question, but what is the difference between running a Python script via flask:5000 server and running it locally? \nI have a script that uses pocketsphinx and it works 100% correctly when I run it in my terminal but when I call it from my flask site it gets an error.\nThere error is:\n\n\"acmod.c\", line 83: Folder 'reqs\/model\/en-us\/en-us' does not contain\n  acoustic model definition 'mdef'\n\nIt doesn't make sense to me since my views.py script is in the same folder that 'reqs' is in and the mdef file IS located in 'reqs\/model\/en-us\/en-us' so I'd think the path would work.\nAnd it works when ran in terminal, just not on the flask site.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":82,"Q_Id":47733364,"Users Score":0,"Answer":"I was able to fix this issue by simply passing the flask app.root_path variable into my python script and adding it in front of 'reqs\/model\/en-us\/en-us' so I guess I needed to have an absolute path instead of a relative one.","Q_Score":0,"Tags":"python,flask,virtualenv,pocketsphinx","A_Id":47735058,"CreationDate":"2017-12-09T21:25:00.000","Title":"Flask and running a script on server VS running in terminal : Different results?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"What is the best way to export\/store items in REST API ?\nI want send scraped items to REST API, where should I put my \nrequests.post(...) ?  Any examples ?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":180,"Q_Id":47769299,"Users Score":1,"Answer":"Thanks Rubber duck debugging, propably simple pipeline with process_item() method, earlier I thought only about Exporters and FeedStorage","Q_Score":1,"Tags":"python,scrapy,scrapy-spider","A_Id":47769467,"CreationDate":"2017-12-12T09:34:00.000","Title":"Scrapy - best way to export\/store items in REST API","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to have a checkboxcolumn in my returned table via Django-filter, then select certain rows via checkbox, and then do something with these rows.\nThis is Django-filter: django-filter.readthedocs.io\/en\/1.1.0 This is an example of checkboxcolumn being used in Django-tables2: stackoverflow.com\/questions\/10850316\/\u2026\nMy question is: can I use the checkboxcolumn for a table returned via Django-filter?\nThanks","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1965,"Q_Id":47783328,"Users Score":0,"Answer":"What django-filter does from the perspective of django-tables2 is supplying a different (filtered) queryset. django-tables2 does not care about who composed the queryset, it will just iterate over it and render rows using the models form the queryset.\nSo if you a checkbox column to the table or not, or use django-filter or not, django-tables2 will just render any queryset it gets.\nIf you want to use the checked records for some custom filter, you'll have to do some manual coding, it's not supported out of the box.\nShort answer: yes, you can use django-tables2 with a CheckboxColumn together with django-filter.","Q_Score":1,"Tags":"python,mysql,django,django-filter,django-tables2","A_Id":47835665,"CreationDate":"2017-12-12T23:40:00.000","Title":"Django-filter AND Django-tables2 CheckBoxColumn compatibility","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am correct in understand that if I use the default worker type (sync) then if the app blocks for any reason, say while waiting fo the result of a database query, the aaociated worker process will not be able to handle any further requests during this time?\nI am looking for a model which doesn't require too much special coding in my app code. I understand there are two async worker types, gevent and gthread, which can solve this problem. What is the difference between these two and and does my app need to be thread safe to use these?\nUPDATE - I did some reading on gevent it seems it works by monkey patching std library functions so I would think that in the case of a database query in general it probably wouldn't patch whatever db library I am using so if I would need to program my app to cooperatively yield control when I waiting on the database. Is this correct?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":874,"Q_Id":47785763,"Users Score":0,"Answer":"If you use threads, you must write your application to behave well, e.g. by always using locks to coordinate access to shared resources.\nIf you use events (e.g. gevent), then you generally don't need to worry about accessing shared resources, because your application is effectively single-threaded.\nTo answer your second question: if you use a pure python library to access your database, then gevent's monkey patching should successfully render that library nonblocking, which is what you want. But if you use a C library wrapped in Python, then monkey patching is of no use and your application will block when accessing the database.","Q_Score":0,"Tags":"python,gunicorn","A_Id":47850707,"CreationDate":"2017-12-13T04:58:00.000","Title":"If I use async workers workers with Gunicorn does my app been to be thread safe?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am using mod_wsgi with pyramid and have different wsgi files per environment\/server like the pyramid-test.wsgi and pyramid-prod.wsgi\nThese files contains code to set environment variables that are different per environment. Example:\n\nos.environ['SQLALCHEMY_URL'] = 'TODO'\n\nI try to move this code to a file called settings.py that will be called in the .wsgi file. These settings files will be hold next to the .wsgi file or preferable in a secure sub dir, such that others can't read the settings (like db password), but can however deploy a new version and overwrite the .wsgi file such that the app is automatically reloaded by Apache.\nHow can I call the python code in the settings.py file from the .wsgi file?\nWhen I try to do that, it can't find it, as it's not part of the app module.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":443,"Q_Id":47814599,"Users Score":1,"Answer":"Presuming you are using recommended separate mod_wsgi daemon process group for each application instance, set the python-path option of the WSGIDaemonProcess directive for each to include the directory where your instance specific settings module is. A normal import should then work.","Q_Score":0,"Tags":"python,mod-wsgi,pyramid","A_Id":47821932,"CreationDate":"2017-12-14T13:32:00.000","Title":"How to call a function in another python file in my wsgi file?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I had a Django project running perfectly using Python 2.7. Now I switched to Python 3 and whenever I click the link shown when I start the Django development server, google chrome opens a new, empty window where previously it opened a new tab in the existing window (which also contained the web application I was trying to run).\nI'm not sure this has anything to do with switching Python versions because I remember seeing this issue before when I wasn't doing anything with Python.\nDoes anybody have clue? It's probably something very simple.\nCheers","AnswerCount":1,"Available Count":1,"Score":-0.1973753202,"is_accepted":false,"ViewCount":61,"Q_Id":47814955,"Users Score":-1,"Answer":"if you are using LoginRequieredMiddleware, browser shows a blank page","Q_Score":0,"Tags":"django,python-3.x,google-chrome","A_Id":47827088,"CreationDate":"2017-12-14T13:50:00.000","Title":"Google Chrome opens empty new window when clicking Django dev server link","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm kind of new to django, I'm having an issue to keep the logged in user still logged in after he made a payment via PayPal.\nSo, the user purchases something on my platform via PayPal payment, he is redirected to PayPal (currently to sandbox PayPal domain), PayPal executes the payment and redirects the user back to my platform using redirect_url I'm generating when sending the payment requests json to PayPal api.\nAfter the user is redirected back to my platform he is not logged in anymore.\nFor example, in another scenario, lets say the user logged in and closed the browser, when they reopen the platform again he is still logged in.\nWhat am I missing here?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":66,"Q_Id":47816469,"Users Score":0,"Answer":"PROBLEM SOLVED, needed to add SESSION_COOKIE_NAME with my domain name in settings.py file","Q_Score":2,"Tags":"python,django,paypal","A_Id":47881662,"CreationDate":"2017-12-14T15:05:00.000","Title":"Django keep logged in lost when going outside to paypal payment","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've added an exploit from www.exploit-db.com to \/.msf4\/modules\/exploit\/windows\/remote\/41987.py following the naming convention. I updated the database with the command updatedb and rebooted. \nMetasploit does not detect the newly added exploit. However, if i add 41891.rb, it detects it no problem.  Why does Metasploit not see the python files?","AnswerCount":4,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":2281,"Q_Id":47820287,"Users Score":0,"Answer":"Because metasploit is purely written in Ruby.","Q_Score":1,"Tags":"python,exploit,metasploit","A_Id":47822711,"CreationDate":"2017-12-14T18:54:00.000","Title":"Metasploit does't detect added exploit from exploit-db","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've added an exploit from www.exploit-db.com to \/.msf4\/modules\/exploit\/windows\/remote\/41987.py following the naming convention. I updated the database with the command updatedb and rebooted. \nMetasploit does not detect the newly added exploit. However, if i add 41891.rb, it detects it no problem.  Why does Metasploit not see the python files?","AnswerCount":4,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":2281,"Q_Id":47820287,"Users Score":0,"Answer":"DO as follow to add python extension (if you havent done yet):\n- meterpreter > use python\n- try python_import to import your python code module","Q_Score":1,"Tags":"python,exploit,metasploit","A_Id":47952094,"CreationDate":"2017-12-14T18:54:00.000","Title":"Metasploit does't detect added exploit from exploit-db","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm implementing a webhooks provider and trying to solve some problems while minimizing the added complexity to my system:\n\nNot blocking processing of the API call that triggered the event while calling all the hooks so the response to that call will not be delayed\nNot making a flood of calls to my listeners if some client is quickly calling my APIs that trigger hooks (i.e. wait a couple seconds and throw away any earlier calls if duplicates come in later)\n\nMy environment is Python (Chalice) and AWS Lambda. Ideal solution will be easy to integrate and cheap.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":55,"Q_Id":47837082,"Users Score":1,"Answer":"I would use SQS \/ SNS depending on exact architecture design. Maybe Apache Kafka, if you need to store events longer... \nSo upcoming event would be placed on SQS, and then other lambda would be used to do processing. Problem is that time of processing is limited to 5 min. Also delivering can't be parallel. \nOther option is to have one input queue, and one output queue per receiver. So the lambda function, which process input, just spreads it through other queues. And then other lambdas are responsible for delivering. That way has other obvious problems.\nFinally. Your lambda, while processing input, can generate messages on outgoing queue, instrumenting what message should be delivered to which users. Then you can have one lambda triggered on each message from outgoing queue. And there you can have small loop delivering messages. Note that in case of problems you need to send back what was not delivered. \nGood point is that SQS has something like dead letter queue, so that problematic messages would not stay there forever.","Q_Score":0,"Tags":"python,aws-lambda,webhooks","A_Id":47854491,"CreationDate":"2017-12-15T17:22:00.000","Title":"Design for implementing web hooks (including not blocking and ignoring superseding repeat events)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've pulled my django repo from bitbucket onto my digital ocean server. My project folder name in my server is project whereas my initial app from my repo (the one with settings.py is called app. Does this cause any problems? Because I know when you create a django project offline, the first directory is always the same as the parent directory.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":1866,"Q_Id":47843529,"Users Score":1,"Answer":"There won't be any issue with having the different name of parent directory and the project directory (the one with settings.py).\nYou can try renaming the parent directory and it would still work the same way but the name of project directory should not be touched since the same is linked with project settings which are used to run the project.","Q_Score":3,"Tags":"python,django","A_Id":47844457,"CreationDate":"2017-12-16T07:25:00.000","Title":"Does my Django app have to be the same name as the project directory?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So I'm moving my project from my offline directory to my remote server on Digital Ocean. Is there anything I need to be concerned about? For example am I safe keeping the same SECRET_KEY that was generated offline? Anything else I need to worry about?","AnswerCount":3,"Available Count":1,"Score":0.0665680765,"is_accepted":false,"ViewCount":44,"Q_Id":47844612,"Users Score":1,"Answer":"Yes, you can copy the whole content of settings.py, but first remove the SECRET_KEY and set DEBUG to FALSE.","Q_Score":1,"Tags":"python,django","A_Id":47845087,"CreationDate":"2017-12-16T10:20:00.000","Title":"Am I safe to copy my settings.py file which was generated offline to my remote server?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am currently developing an app for django that needs to have some custom settings that can be changed at runtime by admin users, and those settings have to be accessible to another separate system that uses the same database.\nOn one hand, we could store those settings in a json file and have it accessible to both systems, as only the django system will actually make any changes to the settings. On the other hand, we could just store those settings as a lone row in on a 'settings' table on the database.\nThe first choice seems quite cumbersome to deal with, and might result in some problems of multiple accesses, while the other would need a whole table in the database for a single row.\nIs any of these ideas any good, or is there something I'm overlooking?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":348,"Q_Id":47860271,"Users Score":0,"Answer":"Make a table. Remember, Django makes it really easy. Just create another class for the settings table and populate it. You should be able to access it with just about any other language\/system - e.g., PHP. The data gets backed up with everything else in the database, if you move to a different server the data moves along with everything else, etc. Yes, the overhead is technically a little more than a plain text file, but if it is really that small then that overhead is insignificant. If the list of settings grows over time then having it in a searchable database will make updates & retrieval much easier that a text file.","Q_Score":0,"Tags":"python,django","A_Id":47860862,"CreationDate":"2017-12-17T22:57:00.000","Title":"Django custom settings for app","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I recently implanted the connection with facebook and google on my local server, and everything worked.\nBut, when I tried to do it in production, the connection with google returns: \"Your credentials aren't allowed\". (Facebook works)\nI don't know why, because i'm pretty sure that my application is confirmed by Google.\nDo you have some ideas ?\nThanks in advance !","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1548,"Q_Id":47929909,"Users Score":1,"Answer":"My bad, I used a wrong key on settings.py","Q_Score":0,"Tags":"python,django,google-api,django-socialauth,social-authentication","A_Id":47943497,"CreationDate":"2017-12-21T17:25:00.000","Title":"\"Your credentials aren't allowed\" - Google+ API - Production","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How do I calculate the response time from the moment where the user input the search criteria until the relevant information are loaded\/displayed onto the portal?","AnswerCount":4,"Available Count":1,"Score":-0.1488850336,"is_accepted":false,"ViewCount":9889,"Q_Id":47937566,"Users Score":-3,"Answer":"You can see it in the internet browsers (F12) or if you use POSTMAN, it show the time.\nIn also you can use standard python library time for measuring the execution time of a piece of code.","Q_Score":6,"Tags":"python,django","A_Id":47937728,"CreationDate":"2017-12-22T07:37:00.000","Title":"How to calculate response time in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am exploring the APIs provided by Google. Firstly, I was experimenting with Google Cloud Vision API with Python in PyCharm in order to try to perform Optical Character Recognition with various texts. \nSo I wrote a basic program in Python in PyCharm which was calling this API, I gave to it as an input an image which included text e.g. the image\/photo of an ice-cream bucket and then takes the text written on this bucket as an output.\nNow I want to test the barcode scanner of Google Mobile Vision API. So ideally I would like to call the Google Mobile Vision API in a python program in PyCharm which calls this API, give as an input an image\/photo of a barcode and take as an output the details saved in this barcode.\nMy question is if this can be (easily) done with PyCharm or if I should download Android Studio to do this simple task?\nIn other words, can I call easily a mobile API in an IDE which is not for mobile app development like Android Studio but in an IDE for desktop applications like Pycharm?\nIt may be a very basic question but I do not know if I missing something important.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":383,"Q_Id":47940052,"Users Score":0,"Answer":"The mobile vision API is designed only for Android and iOS. As far as I know, Pycharm does not work well with Java, so I would say that you would have to create an Android\/iOS project in order to test it (It would be a lot harder trying to make it work with python than simply installing Android studio and cloning a mock project).","Q_Score":0,"Tags":"android,python,api","A_Id":47940628,"CreationDate":"2017-12-22T10:36:00.000","Title":"Can I use Google Mobile Vision API in PyCharm?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"So, my project does a lot of mathematics for the user. It lets them enter equations and then solves them with some fairly complicated items like eigenvalues. I do some of this is javascript, but I have also written a python script utilizing numpy. I would like the user to be able to have the option of having the script on their local machine and then solving the mathematics there instead of on my server.\nSo, the user would enter an equation and hit enter. The javascript would then call a python script running on the users local machine. The equation is solved there with my code and the result is returned to the web page.\nI thought that this would be possible with CGI, but I cannot seem to find clear documentation on how this would be accomplished. Is there a better way?\nI do not want to run third party software and I do not want to run the python code in the browser.\nThanks","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":399,"Q_Id":47956052,"Users Score":0,"Answer":"Short answer is: no, this isn't possible.\nSure, they can download your script and run it themselves if they have a compatible version of Python installed, but you won't be able to run it from the browser (that would be a severe security problem!)\nYour options are either to write it in JS, or create an API on your server, or find and use an existing API.","Q_Score":0,"Tags":"python,cgi","A_Id":47956075,"CreationDate":"2017-12-23T21:12:00.000","Title":"Call python script from web page and get results","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Django site that I want to add videos. Currently users can upload their photos and I want each user to be able to add their videos as well. I am not sure how to do this, since I am a beginner programmer. Can you please direct me to right way?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":93,"Q_Id":47966082,"Users Score":0,"Answer":"Handling video files is much more complicated than dealing with images. There are two ways you can do it: you let users embed videos uploaded to other sites (like youtube) or you let them upload photos to your website. The first option is easier: most of the video websites offer some way to copy&paste a code to embed their videos on other sites. You just need to let users paste the html code on your website and there are some security measures you should take care of. \nIf you want them to upload the files it's getting hard.There are many video formats, files are much bigger, different compression rates etc. A video site usually accepts a wide range of video formats, converts a video to the most convenient format and different resolutions (to save space and bandwidth). It means a lot of asynchronous and CPU intensive tasks on your server.\nIt's also more complicated to put the file on the website and let it play.\nThere's a video tag in HTML5 that makes things much easier than before although if you want to make it really nice and easy you should find some JS player.","Q_Score":0,"Tags":"python,django,web-applications,video-embedding","A_Id":47990584,"CreationDate":"2017-12-25T05:57:00.000","Title":"Video embedding","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working with alembic and it automatically creates a table called alembic_revision on your database.  How, do I specify the name of this table instead of using the default name?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":874,"Q_Id":47979390,"Users Score":8,"Answer":"After you run your init. Open the env.py file and update context.configure, add version_table='alembic_version_your_name as a kwarg.","Q_Score":4,"Tags":"python,sqlalchemy,alembic","A_Id":47979603,"CreationDate":"2017-12-26T13:36:00.000","Title":"Alembic, how do you change the name of the revision database?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is there any way with Flask App builder to add post processing to after the form has been posted? For example, after the add form is submitted, I'd like to modify some of the data that has been sent. \nI cannot for the life of me find anything in the docs, and I feel like this should be basic functionality.\nThanks","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":364,"Q_Id":47980515,"Users Score":0,"Answer":"This can be accomplished by overriding the post_add function. If you want to modify the data before it is sent (which is what I wanted to do) that would be overriding the pre_add function.","Q_Score":0,"Tags":"python,flask,flask-appbuilder","A_Id":47981099,"CreationDate":"2017-12-26T15:20:00.000","Title":"Flask App Builder - Post Processing Model View","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"background\nI aim at overing a project which is made up of django and celery.\nAnd I  code two tasks which would sipder from two differnt web and save some data to database \u2014\u2014 mysql.\nAs before, I do just one task, and I use update_or_create shows enough.\nBut when I want to do more task in different workers ,and all of them may save data to database, and what's more, they may save the same data at the same time.\nquestion\n\nHow can I ensure different tasks running in different worker makeing no repeating data  when all of them try to save the same data?\nI know a django API is select_for_update which would set a lock in database. But when I reading the documentions,  it similar means, would select,if exist,update. But I want to select,if exist,update,else create. It would more be like update_or_create,but this API may not use a lock?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":47,"Q_Id":47985369,"Users Score":0,"Answer":"about sorry\nMay the user anwered my question before had give me the right answer, but I did not get what they means.\nwhat I choose\nFinally I use the redis lock to ensure no repeating data.\nThe logic just below:\nwhen I get the data,I try to use 'set(key,value.nx=True,ex=60)' to get a lock from redis.\nIf the answer is True,I would try to use the django queryqpi 'update_or_create()'.\nIf not,I did nothing and return True.\nIt make the burst problem like a single process.","Q_Score":0,"Tags":"python,mysql,django","A_Id":48016519,"CreationDate":"2017-12-27T01:37:00.000","Title":"How to ensure no repeating datas when use django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So I have 2 apps for my django project. In the default mysite folder, you have the urls.py file. I cant seem to find out how to write all my urls for all the apps in just the one urls.py file.\nI have tried this: \nfrom reviews.models import *\nhowever that isnt working. \nThanks for any help!","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":29,"Q_Id":48008791,"Users Score":0,"Answer":"Just realised that i was importing the models instead of the views.\nthe code above should be from reviews.views import *","Q_Score":0,"Tags":"python,django","A_Id":48009047,"CreationDate":"2017-12-28T13:56:00.000","Title":"Django URLs from different apps in just the base one","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have imported \"smtplib\" in the code, and I doubt that the server won't have this installed. Is there a CDN for modules in python ?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":30,"Q_Id":48010487,"Users Score":1,"Answer":"You should save your dependencies in a requirements.txt file and use pip to install the requirements as part of your Django app's deployment process.\nEdit: smtplib is part of the standard lib, so it should be available out of the box.","Q_Score":0,"Tags":"python,django","A_Id":48010534,"CreationDate":"2017-12-28T15:54:00.000","Title":"What if the hosting Django server don't have the module I imported?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have been learning python for some weeks. Presently I'm having some problems\/questions with Python's re.findall(). \nIn some books or videos they use re.search() seldom they use match(). In django documentation I read search finds the first match, and re.match finds a match at the beginning of a string.\nBut in all cases re.findall() would work well. So why shouldn't I use only re.findall() all the time?\nAs I want to get better in Python I want to understand it, therefore I asked this question.\nBest regards Jonathan","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":317,"Q_Id":48012824,"Users Score":3,"Answer":"The most important reason is performance: findall needs to find all occurences, so it searches the whole string. search just searches the string until it finds a match, so provided the pattern is present it will be faster. match just checks if the beginning of the string matches the pattern, so it probably doesn't need to search the whole string (except in some edge cases).\nSo findall will be slower in the best case than match or search.\nAdditionally findall also stores all matches, so it can easily take much more memory than search or match which only store the first match (or nothing at all).\nSo findall is more memory expensive.\nLast but not least match and search return SRE_Match objects which not only store the matched substring but also the position (and groups if you use patterns with capture groups). Thanks @kindall which posted this in the comments.\nSo, while you could use findall instead of match or search it can be slower, uses more memory and stores less information for the match. So I wouldn't use it as replacement for search or match except you also need to find all other occurences.","Q_Score":2,"Tags":"python,python-3.x","A_Id":48013139,"CreationDate":"2017-12-28T18:51:00.000","Title":"Why do not always use Python's re.findall instead of re.search","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to build a AWS Lambda function using APi Gateway which utlizes pyodbc python package. I have followed the steps as mentioned in the documentation. I keep getting the following error Unable to import module 'app': libodbc.so.2: cannot open shared object file: No such file or directory when I test run the Lambda function. \nAny help appreciated. I am getting the same error when I deployed my package using Chalice. It seems it could be that I need to install unixodbc-dev. Any idea how to do that through AWS Lambda?","AnswerCount":6,"Available Count":1,"Score":0.0333209931,"is_accepted":false,"ViewCount":6014,"Q_Id":48016091,"Users Score":1,"Answer":"Fisrt, install unixODBC and unixODBC-devel packages using yum install unixODBC unixODBC-devel. This step will install everything required for pyodbc module. \nThe library you're missing is located in \/usr\/lib64 folder on you Amazon Linux instance.\nCopy the library to your python project's root folder (libodbc.so.2 is just a symbolic link, make sure you copy symbolic link and library itself as listed): libodbc.so, libodbc.so.2 and libodbc.so.2.0.0","Q_Score":3,"Tags":"python,amazon-web-services,aws-lambda,chalice","A_Id":50925535,"CreationDate":"2017-12-29T00:40:00.000","Title":"Unable to use pyodbc with aws lambda and API Gateway","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on python flask with Dynamo DB ,is there any functionality to auto increment the primary key in AWS Dynamo DB (like SQL.AUTOINCREMENT), Any suggestion on this? how to handle the AUTOINCREMENT Feature in AWS DynamoDB.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":923,"Q_Id":48023512,"Users Score":1,"Answer":"Generally speaking, using an auto-increment primary key is not going to be best practice. If you really want to do it, you could use a lambda function and another dynamodb table that stores the last used value, but you would be much better off picking a better primary key so that you don't run into performance problems down the road.\nGenerally speaking, a GUID is a very easy to use alternative for a primary key where you don't have another obvious field to use.","Q_Score":1,"Tags":"python,amazon-web-services,amazon-dynamodb","A_Id":48023965,"CreationDate":"2017-12-29T13:40:00.000","Title":"DynamoDB AutoIncrement Primary key Python flask","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working in PyCharm professional version and I am not able to run Django server from PyCharm, though I can start it from cmd.\nAfter starting the server from cmd, everything works fine, I can reach my urls and get a response.\nWhen I am trying to do the same from Pycharm, first I get a windows error (\"Python has stopped working. A problem caused the program to stop working correctly. Please close the program.) When I click \"Close the program\", it does not close, and I can see the following in error in PyCharm:\nProcess finished with exit code -1073741819 (0xC0000005)\nI am using the following versions:\nPython version: 3.6.1\nDjango version: 1.9.13\nI have already tried Tools | Run manage.py Task | runserver , which gives the same result.\nI have found a way to make this error disappear in PyCharm:\nWhen I go to Run | Edit Configurations |  and check \"No reload\", then the server starts normally and I can access it through the browser.\nDoes anyone have a hint on why this is happening? What is the purpose of \"No reload\"?\nThank you for the answer!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":326,"Q_Id":48026159,"Users Score":0,"Answer":"You should check if in Setting\/Languages & Frameworks\/Django the option Enable Django Support if selected,\nthen you should check if the routes to Django Project Root, Settings and manage.py are set correctly.\nregards","Q_Score":0,"Tags":"python,django","A_Id":48027969,"CreationDate":"2017-12-29T17:25:00.000","Title":"Why does Django server crash in PyCharm professional?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I tried of creating project in Windows. When I type django-admin.py startproject projectname it takes but it won't created in folder. Everything is installed and previous project also running fine.","AnswerCount":2,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":1446,"Q_Id":48031800,"Users Score":4,"Answer":"instead of django-admin.py startproject projectname, use\ndjango-admin startproject projectname\nIn windows, open folder where you want to create the project, point to empty space and press Shift and then right mouse click. Choose the option Open Command Window Here. Then in command window, just enter above command.","Q_Score":1,"Tags":"python,django","A_Id":48031808,"CreationDate":"2017-12-30T07:09:00.000","Title":"How to create Django project in Windows?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to build an existing Python web application in jenkins, just like building a java application using Maven.\nIs it possible or not? if possible, please help me with necessary configurations to build and Continuous Deployment of the same application.","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":1298,"Q_Id":48032756,"Users Score":2,"Answer":"Options 1) without using docker\n\nChoose Free Style project when create jenkins job\nConfigure the Source code management section to tell jenkins where to fetch the source code, \nWrite the build commands you used by manual in build section.  \nIf your jenkins slave not installed Python and jenkins server not support to install Python on jenkins slave, you need to write commands in 'build' section to install Python,pip needed for build on jenkins slave.\n\nOption 2) using docker\n\nBuild a docker image with all requried soft and tool installed and configured to supply a build enviroment  \n(You can search there is exist docker image can meet your requirement on docker image hub before build image yourself? )\nUpload the image to docker image hub\nInstall docker engine on jenkins slave\nCreate Free style project\nCongiure Source Code Management section\nWrite docker command in  Build section to pull docker image and start a docker container, execute build command inside container","Q_Score":3,"Tags":"python,jenkins,build,continuous-deployment","A_Id":48034085,"CreationDate":"2017-12-30T09:48:00.000","Title":"Building a Python Web application in jenkins","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a website that uses python\/flask, and I know that firebase hosting is only for static websites, but I need to be able to use firebase cloud functions in my app, and that requires firebase hosting (please correct me if I am wrong). As node js is server side, but you can use it with firebase hosting, I was hopeful that there might be a way to use python too. Otherwise, if there is a way to use cloud functions without firebase hosting, you can tell me about that too.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":9781,"Q_Id":48040767,"Users Score":3,"Answer":"You don't need Firebase Hosting for using Firebase Functions, and as you mentioned Firebase Hosting is for static pages. \nFirebase Functions are hosted on firebase (independent from Firebase Hosting for static pages), and currently don't support python.\nFor HTTP trigger Firebase Functions you simply make HTTP requests to your function's url, from any backend or from frontend itself. \nFirebase DB\/Storage and other trigger functions work in the same way, but don't explicitly call then they are triggered on specific events in DB\/Storage etc. that you specify when defining functions.","Q_Score":1,"Tags":"python,firebase,flask,firebase-hosting","A_Id":48040899,"CreationDate":"2017-12-31T07:26:00.000","Title":"Can python\/flask websites be hosted on firebase?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've been thinking of this for a LONG time the past few days and can't figure out with my current toolset how to implement this in Django.\nWhat I want is something that can be implemented trivially in Java for example, but how I'd do that on the web is much more difficult\nThe problem\nI want to send data to a HTML template, specific example:\n\"What is 5 + 50?\"\nThe data must be dynamically generated, so the 5 and 50 are actually randomly generated.\nI think I am comfortable doing this part, as I'd simply pass a random variable to a template using the views.py\nThis is where I do not know how to proceed\nI want the user to be able to enter their answer, and have them notified if it correct.\nTo do this, I'd need to pass the variables from the template back to another view function. I am not sure how to do that, if it is possible at all.\nThis is how I'm deciding to pursue my projecti dea, and I'm not sure if this is the most efficient way\ntl;dr I just wanted data to be randomly generated and calculated using Django","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":131,"Q_Id":48041129,"Users Score":0,"Answer":"A pure django solution would be:\n\ncreate a form with three integer fields (say, num1, num2 and result)\nin your view, populate num1 and num2 with the numbers to be added\nrender the form in your template (num1 and num2 fields should be read only)\nthe user enters the answer in the result field and submits the form\nin your view, determine whether num1 + num2 == result\nredirect to a success page if the answer is correct, otherwise redisplay the form","Q_Score":0,"Tags":"python,django","A_Id":48041312,"CreationDate":"2017-12-31T08:40:00.000","Title":"Coding mental block with specific Django task","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to build an application with mongoDB and Python Flask. While running the application, I am getting below error:\n\nConfigurationError: Server at 127.0.0.1:27017 reports wire version 0,\n  but this version of PyMongo requires at least 2 (MongoDB 2.6).\n\nCan any one help me in this?\nThanks,\nBalwinder","AnswerCount":5,"Available Count":1,"Score":0.0399786803,"is_accepted":false,"ViewCount":25842,"Q_Id":48060354,"Users Score":1,"Answer":"This works for me:\n\nsudo pip3 uninstall pymongo\nsudo apt-get install python3-pymongo\n\nI hope that works for someone else, regards.","Q_Score":10,"Tags":"python,mongodb,flask","A_Id":54701902,"CreationDate":"2018-01-02T11:43:00.000","Title":"ConfigurationError: Server at 127.0.0.1:27017 reports wire version 0, but this version of PyMongo requires at least 2 (MongoDB 2.6)","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have written a websocket server in tornado and i used websocket_ping_interval=60 to detect which connection is really closed after 60 sec. but after 60 sec the server disconnects the link(even if it's been disconnected). i think this is done because the server sends a ping packet each 60sec and the client doesn't response to the server. i want the client side(which is written in websocket python module) to response the server whenever the server sends ping req.\nI have the same problem with client websocket in browsers. any idea how to solve it?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":720,"Q_Id":48062744,"Users Score":1,"Answer":"Tornado's websocket implementation handles pings automatically (and so do most other implementations). You shouldn't have to do anything.\nTornado's ping timeout defaults to 3 times the ping interval, so if you're getting cut off after 60 seconds instead of 180 seconds, something else is doing it. Some proxies have a 60-second timeout for idle connections, so if you're going through one of those you may need a shorter ping interval. \nIf that's not it, you'll need to provide more details, ideally a reproducible test setup with client and server code.","Q_Score":1,"Tags":"python,websocket,tornado","A_Id":48070341,"CreationDate":"2018-01-02T14:28:00.000","Title":"how to response to the server ping in tornado websocket","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am leaning Python programming language. I have no problems with Python. I read Python official docs, and I can write small programs in Python. I want to familiarize myself with mysql database because it is useful in learning  software development concepts. I've installed mysql database and Django on my computer. I have Ubuntu 14.04 and python 3.4 installed. I've configured Django settings to use mysql database. I tested Django connection to mysql db and all things work properly.\nI am a complete newbie with web development. I didn't create my own website and I didn't start developing any web application.\nMy purpose currently is to master creation of mysql database and tables, making changes\/migrations\/queries, using Django models and Python.\nIs it reasonable\/possible to use Django ORM for work with mysql database without simultaneous development of a web application\/local application? As I've said, I don't have my own website. I want just to try using mysql and Django together on my computer in order to get deeper knowledge as to Django and mysql in this respect. \nMy final purpose is development in Python, including work with mysql database. \nMysql without Python and Django is of no use for me.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":67,"Q_Id":48062763,"Users Score":1,"Answer":"If you want to learn and use MySQL, then start without anything above it - no Django, no ORM, not even a Python script. Learn to configure your mysql server (the server process I mean - doesn't have to be on a distinct computer), to work with the command-line mysql client (database creation, tables creations \/ modifications, adding\/updating\/deleting rows, and, most important, doing simple and complex queries).\nWhile you're at it, learn about proper relational data modeling (normalisations etc) so you fully understand how to design your schemas. \nOnce you're confortable with this, spend some time (should be quite fast at this point) learning to do the same things from python scripts with your python's version mysql connector.\nThen if you want to learn web development and Django, well go for it. The ORM is quite easy to use when you already have a good understanding of what happens underneath, so by that time you shouldn't have much problems with this part. What you'll still have to learn are the HTTP protocol (trying to do web programming without understanding the HTTP protocol is like trying to win a car race without knowing how to drive a car - it's not technically impossible but it might end up being very painful experience), then front-end stuff (html\/css\/javascript) and finally the views \/ templates parts of Django (which should be easy once you know HTTP and html). \nYou can of course jump right in into Django, but you will probably fight with way too many concepts at once and end up spending twice more time to figure out how everything works and why it works that way.","Q_Score":0,"Tags":"python,mysql,django,database","A_Id":48063653,"CreationDate":"2018-01-02T14:30:00.000","Title":"Django to create and change mysql database for learning purposes","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working on a Django application that consists of a scraper that scrapes thousands of store items (price, description, seller info) per day and a django-template frontend that allows the user to access the data and view various statistics. \nFor example: the user is able to click on 'Item A', and gets a detail view that lists various statistics about 'Item A' (Like linegraphs about price over time, a price distribution, etc) \nThe user is also able to click on reports of the individual 'scrapes' and get details about the number of items scraped, average price. Etc. \nAll of these statistics are currently calculated in the view itself. \nThis all works well when working locally, on a small development database with +\/100 items. However, when in production this database will eventually consist of 1.000.000+ lines. Which leads me to wonder if calculating the statistics in the view wont lead to massive lag in the future. (Especially as I plan to extend the statistics with more complicated regression-analysis, and perhaps some nearest neighbour ML classification)\nThe advantage of the view based approach is that the graphs are always up to date. I could offcourse also schedule a CRONJOB to make the calculations every few hours (perhaps even on a different server). This would make accessing the information very fast, but would also mean that the information could be a few hours old. \nI've never really worked with data of this scale before, and was wondering what the best practises are.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":562,"Q_Id":48080579,"Users Score":3,"Answer":"As with anything performance-related, do some testing and profile your application. Don't get lured into the premature optimization trap.\nThat said, given the fact that these statistics don't change, you could perform them asynchronously each time you do a scrape. Like the scrape process itself, this calculation process should be done asynchronously, completely separate from your Django application. When the scrape happens it would write to the database directly and set some kind of status field to processing. Then kick off the calculation process which, when completed, will fill in the stats fields and set the status to complete. This way you can show your users how far along the processing chain they are.\nPeople love feedback over immediate results and they'll tolerate considerable delays if they know they'll eventually get a result. Strand a user and they'll get frustrate more quickly than any computer can finish processing; Lead them on a journey and they'll wait for ages to hear how the story ends.","Q_Score":2,"Tags":"python,django,database","A_Id":48080725,"CreationDate":"2018-01-03T15:42:00.000","Title":"Django - when best to calculate statistics on large amounts of data","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"By default, candlestick and ohlc charts display a rangeslider. \nIt seems like there's no parameter to change the setting. So I've looked at javascript code in html file but was not able to find a clue to remove it.\nCan someone explain how to remove the rangeslider from candlestick chart?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2723,"Q_Id":48085374,"Users Score":5,"Answer":"I found the solution..\nFollowing code hides the rangeslider graph on the bottom of candle stick chart..\nxaxis : {fixedrange: true, rangeslider: {visible: false}}","Q_Score":1,"Tags":"javascript,python,plotly","A_Id":48085729,"CreationDate":"2018-01-03T21:28:00.000","Title":"Plotly - How to remove the rangeslider","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So basically, what I want to do is have a user input some data in an HTML form or something (on client end). Have that data be carried over to a server, where the data is put through some python code and the processed result is sent back to the client. I know, I could use javascript to do this on the user side itself, but I want to experiment a bit and make use of some libraries like tensorflow, matplotlib and so on.\nAlso, is there some way, you know like Web Assembly to run python code on the client side. Like maybe, send data from server or have it fed by the user, and on some virtual environment type setup and processed ??\nNote: I know flask exists and I've tried it, but I can't see the same flexibility as you know regular python code.\nThanks in advance","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":400,"Q_Id":48099019,"Users Score":1,"Answer":"You can use Brython in the browser, it's pretty spiffy. Full dom-manipulation from python; fully compatible with libraries written in pure python. Really neat stuff. \nAs for the server-side, if you want to keep it full-python, you'll need to use something like flask, bottle, cherrypy, aiohttp,...\nIf you find yourself struggling; maybe try starting out writing a simple socket-based microservice? You'll then be able to either farm requests out to it from any other server; or incorporate the code in your (python) server code.\nGood luck!","Q_Score":0,"Tags":"python,flask,server-side,client-side,webassembly","A_Id":48099607,"CreationDate":"2018-01-04T15:59:00.000","Title":"Running Python on Server and sending results to Client and vice versa","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have two scenarios for two pages (homepage and property page). And in these scenarios I have the same steps (I fill in \"field\" with \"text\").\nI need to implement one for homepage and one for property page. But behave sees only one implementation. How could I do the different implementation for the same named steps? \nI dont want to do hardcode and call the same action differently.\nMy stack: behave + python + selenium + pageObject","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":75,"Q_Id":48116487,"Users Score":0,"Answer":"Somehow, somewhere, you have to put in code to say the things are different.\n\nAdd another variable to the statement (I fill in \"field\" on \"page\" with \"text\")\nUse two statements (I fill in homepage \"field\" with \"text\" && I fill in property \"field\" with \"text\")\nAdd logic to the method to dynamically figure out what page it is looking at to know what field is which\n\nAll have advantages and drawbacks. You'll need to decide which works best for your situation. The problem with having a generic statement is that it can be applied to too many areas and eventually something has to give.","Q_Score":0,"Tags":"python,selenium-webdriver,python-behave","A_Id":48119458,"CreationDate":"2018-01-05T15:21:00.000","Title":"How to create several implementation for the same named steps (behave)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to use google appengine.api in local machine. i have installed google cloud SDK and started it ,the authentication is successful . I have executed  $dev_appserver.py app.yaml at the project path which has started a google app engine server at localhost:8000 . \nwhen i want to execute the program it gives an error message \" ImportError: No module named appengine.api \" \nI appreciate your help .","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":536,"Q_Id":48118849,"Users Score":1,"Answer":"I tried executing the project in local in pycharm, so i got the above error(google.appengine.api error). Basically it has to be executed on a server.The server can be started using your terminal.\n1) Go to the project path(root folder of all files in the project where the app.yaml file is located,eg: appengine)\n2) start the server using $ dev_appserver.py app.yaml. It starts server at localhost port 8000 as the default one.\n3) In the server start depends on the handler and its path specified (like '\/' or '\/testjob') try localhost:8000\/ or localhost:8000\/testjob\n4) All the logs written in the program will be shown in the terminal. For logs try using 'logging' module , make sure to mention the logging level else basic level logs are not shown","Q_Score":0,"Tags":"python-2.7,google-app-engine,windows-10,gcloud","A_Id":48203280,"CreationDate":"2018-01-05T17:54:00.000","Title":"ImportError: No module named appengine.api -windows 10,local env, python 2.7","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a Flask app and want it to work for www.domain-a.net and www.domain-b.net behind Apache + WSGI. I can get it to work for one or the other, but can't find a way to get it to work for both. It seems that the domain which registers first is the only one that works.\nPreferably this would work by having two Apache VirtualHosts set up to use the same WSGI config. I can get that part to work. But Flask just returns 404 for everything sent from the second VirtualHost.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":392,"Q_Id":48122283,"Users Score":1,"Answer":"It seems that having SERVER_NAME set in the os environment was causing this problem in conjunction with subdomains in blueprint registration. I removed SERVER_NAME from \/etc\/apache2\/envvars and the subdomain logic and it worked.","Q_Score":2,"Tags":"python,apache,flask,virtualhost","A_Id":48142441,"CreationDate":"2018-01-05T22:38:00.000","Title":"how do I get Flask blueprints to work with multiple domains?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using boto to deploy json templates in AWS. My question is Can i use the same boto library to deploy Templates in Yaml as well.When i tried i got the error no json could be decoded.\nIf there is a way then please share an example\nThanks.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1498,"Q_Id":48125175,"Users Score":0,"Answer":"We just need to use Yaml decoder in place of json decoder as follows :-\nwith open(template_path) as yaml_data:\n template = yaml.load(yaml_data)\n template_body = yaml.dump(template)\nDon`t forget to import Yaml.","Q_Score":0,"Tags":"python,amazon-web-services,boto,boto3","A_Id":48161874,"CreationDate":"2018-01-06T07:21:00.000","Title":"Can we use Boto to deploy Yaml templates?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm rather new to the whole ORM topic, and I've already searched forums and docs.\nThe question is about a flask application with SQLAlchemy as ORM for the PostgreSQL.\nThe __init__.py contains the following line:\ndb = SQLAlchemy()\nthe created object is referenced in the other files to access the DB.\nThere is a save function for the model:\ndef save(self):\n    db.session.add(self)\n    db.session.commit()\nand also an update function:\ndef update(self):\n    for var_name in self.__dict__.keys():\n        if var_name is not ('_sa_instance_state' or 'id' or 'foreign_id'):\n            # Workaround for JSON update problem\n            flag_modified(self, var_name)\n    db.session.merge(self)\n    db.session.commit()\nThe problem occurs when I'm trying to save a new object. The save function writes it to DB, it's visible when querying the DB directly (psql, etc.), but a following ORM query like:\nmodel_list = db.session.query(MyModel).filter(MyModel.foreign_id == this_id).all()\ngives an empty response.\nA call of the update function does work as expected, new data is visible when requesting with the ORM.\nI'm always using the same session object for example this:\n<sqlalchemy.orm.scoping.scoped_session object at 0x7f0cff68fda0>\nIf the application is restarted everything works fine until a new object was created and tried to get with the ORM.\nAn unhandsome workaround is using raw SQL like:\nmodel_list = db.session.execute('SELECT * FROM models_table WHERE\n foreign_id = ' + str(this_id))\nwhich gives a ResultProxy with latest data like this:\n<sqlalchemy.engine.result.ResultProxy object at 0x7f0cf74d0390>\nI think my problem is a misunderstanding of the session. Can anyone help me?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":766,"Q_Id":48128705,"Users Score":0,"Answer":"It figured out that the problem has nothing to do with the session, but the filter() method:\n# Neccessary import for string input into filter() function\n from sqlalchemy import text\n # Solution or workaround\n model_list = db.session.query(MyModel).filter(text('foreign_key = ' + str(this_id))).all()\nI could not figure out the problem with:\nfilter(MyModel.foreign_id == this_id) but that's another problem.\nI think this way is better than executing raw SQL.","Q_Score":1,"Tags":"python-3.x,postgresql,flask-sqlalchemy","A_Id":48283838,"CreationDate":"2018-01-06T15:17:00.000","Title":"SQLAlchemy scoped_session is not getting latest data from DB","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"An a interviewer asked me what is the command to check your model has no errors.\nDoes Django have any type of command like this?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":241,"Q_Id":48155275,"Users Score":0,"Answer":"Running the makemigrations command will return any errors on the model. At least that's where I find that I forgot a default value for required fields, etc.","Q_Score":1,"Tags":"python,django,django-models,django-views","A_Id":48155554,"CreationDate":"2018-01-08T17:34:00.000","Title":"How to check your model has no errors in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In working with the Django user model I've noticed model managers include a using=self._db parameter when acting on a database. If I'm only using a single database, is this necessary? What does using=self._db do other than specify the database. Is this specified as a fail-safe in the event another database is added?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2226,"Q_Id":48173347,"Users Score":9,"Answer":"Managers use that parameter to define on which database the underlying queryset the manager uses should operate on. This is simply there to optionally override it in case you have e.g. multiple databases and you want your manger\/queryset to operate on a specific one.","Q_Score":10,"Tags":"python,django,database","A_Id":48174325,"CreationDate":"2018-01-09T17:09:00.000","Title":"Do Django Model Managers require using=self._db","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm running apache2 web server on raspberry pi3 model B. I'm setting up smart home running with Pi's and Uno's. I have a php scrypt that executes python program>index.php. It has rwxrwxrwx >I'll change that late becouse i don't fully need it.\n And i want to real-time display print from python script.\n exec('sudo python3 piUno.py') Let's say that output is \"Hello w\"\nHow can i import\/get printed data from .py?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2682,"Q_Id":48174011,"Users Score":0,"Answer":"First make sure you have permissions to write read execute  for web user.\nYou can you user sudo sudo chmod 777 \/path\/to\/your\/directory\/file.xyz\nFor php file and file you want to run. $output = exec('sudo pytho3 piUno'); echo $output;\nCredits ---> Ralph Thomas Hopper","Q_Score":0,"Tags":"php,python,python-3.x,raspberry-pi3","A_Id":48174819,"CreationDate":"2018-01-09T17:50:00.000","Title":"get python to print\/return value on your website with php","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've been trying to implement some HTML code that accesses weather data in historical CSV files online, and perform maths on the data once I selectively extract it.\nIn the past, I've programmed in Python and had no problems doing this by using pycurl.Curl().  HTML is a complete nightmare in comparison:  XMLHttpRequest() does technically work, but web browsers automatically block access to all foreign URLs (because of the Same-Origin Policy).  Not good.\nAny ideas and alternative approaches would be very helpful!","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":238,"Q_Id":48179772,"Users Score":0,"Answer":"I'm pushing against the boundaries set forth in your question.. if you're simply wanting to do it in JavaScript, but outside the context of a browser, have you considered working in Node?","Q_Score":1,"Tags":"javascript,python,html,csv,remote-access","A_Id":48180149,"CreationDate":"2018-01-10T03:15:00.000","Title":"HTML - Access data from remote online CSV files","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Am using haystack with solr 6.6 for search indexing. Now i want to automatically update indexes when data changes in my models under indexing, so am using celery_haystack for that. Unfortunately, each time index should be updated i get could not load [app.model.pk]. Somehow it went missing error\n\npython 3.6.3\ndjango 1.11.6\ncelery 4.1.0\ndjango-haystack 2.7.dev0\ncelery-haystack 0.10\n\nThanks in advance.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":61,"Q_Id":48193410,"Users Score":0,"Answer":"Strangely after trying and trying i decided to restart the whole system and it just started working, without changing anything","Q_Score":0,"Tags":"python,django,solr,celery","A_Id":48265807,"CreationDate":"2018-01-10T17:55:00.000","Title":"Couldn't load \"object\". Somehow it went missing?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I created a new method in my custom module and I want to use my method when user clicks button confirm in sale order. so I did research and found easy solution to complete this job.\n\nOverride base method. In this case is method action_confirm() in sale.py by use super() method.\n\nso I am just wondering, is it the right way?Is there a better solution than this? please suggest me.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":882,"Q_Id":48199519,"Users Score":2,"Answer":"The best way to overwrite any method is to use super(), to execute the old functionality and avoid destroying the functionality of other module methods which also overwrite that source method. If you do that you're doing well. But sometimes you'll find situations in which you can't use super() and you need to copy the source code to modify anything inside. In those cases, you must be careful and be aware of what you're overwriting.\n\nExample A\n\n\nYou've the base method action_confirm(), which is created by sale module.\nYou install a module named sale_extension, which overwrites action_confirm() method using super().\nThen you install your custom module, where you're also overwriting action_confirm() with super().\nWhen action_confirm() is called, it's going to execute sale, sale_extension and your module functionality.\n\n\nExample B\n\n\nYou've the base method action_confirm(), which is created by sale module.\nYou install a module named sale_extension, which overwrites action_confirm() method using super().\nThen you install your custom module, where you're also overwriting action_confirm() without super(), so you've been copied the source code of action_confirm() and modified it.\nWhen action_confirm() is called, it's going to execute sale and your module functionality, but not the sale_extension one.\nSo you should have understood first and then have added the code introduced by sale_extension in the source code you had copied, and then, modify it.\nThe problem with this case is the future modules you can install, if they overwrite action_confirm(), your code is going to ignore their changes.\n\nSo the conclusion is that if you use super(), you're not bound to have problems in your method when installing new modules (although there are cases in which even with super(), you'll have to modify your code to adapt it to the new installed module functionality).","Q_Score":1,"Tags":"python,odoo-10,odoo","A_Id":48203871,"CreationDate":"2018-01-11T03:53:00.000","Title":"Is override base method in Odoo is good option?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm running java commands through my python script but getting Error: Could not create the Java Virtual Machine.\nError: A fatal exception has occurred. Program will exit.\n . The script is running through cmd.\nI removed max and min heapsize in pycharm.exe.vmoptions. Also, degraded the java version but nothing worked.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":611,"Q_Id":48201478,"Users Score":0,"Answer":"Found solution : I downgraded my PyCharm version to 2.4 and now it's working.","Q_Score":0,"Tags":"java,python,python-3.x,jvm,pycharm","A_Id":48224581,"CreationDate":"2018-01-11T07:04:00.000","Title":"Pycharm : Getting \"Error: Could not create the Java Virtual Machine. Error: A fatal exception has occurred. Program will exit.\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Flask app that I run with uWSGI. I have configured logging to file in the Python\/Flask application, so on service start it logs that the application has been started.\nI want to be able to do this when the service stops as well, but I don't know how to implement it.\nFor example, if I run the uwsgi app in console, and then interrupt it with Ctrl-C, I get only uwsgi logs (\"Goodbye to uwsgi\" etc) in console, but no logs from the stopped python application. Not sure how to do this.\nI would be glad if someone advised on possible solutions.\nEdit:\nI've tried to use Python's atexit module, but the function that I registered to run on exit is executed not one time, but 4 times (which is the number of uWSGI workers).","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":183,"Q_Id":48206010,"Users Score":1,"Answer":"There is no \"stop\" event in WSGI, so there is no way to detect when the application stops, only when the server \/ worker stops.","Q_Score":0,"Tags":"python,logging,flask,uwsgi","A_Id":48211175,"CreationDate":"2018-01-11T11:29:00.000","Title":"Logging uWSGI application stop in Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Ok,\nI had a look at the UploadFile Class documentation of the Django framework. Didn't find exactly what I am looking for?\nI am creating a membership management system with Django. I need the staff to have  the ability to upload excel files containing list of members (and their details) which I will then manipulate to map to the Model fields.\nIt's easy to do this with pandas framework for example, but I want to do it with Django if I can.\nAny suggestions.\nThanks in advance","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":195,"Q_Id":48236905,"Users Score":0,"Answer":"you can use xlrd to read excel files\nin client side you just submit a form with file input.\non server uploaded file stored on request.FILES\nread file and pass it to xlrd then process sheets and cells of each sheet","Q_Score":0,"Tags":"python,django,excel,django-models","A_Id":48237156,"CreationDate":"2018-01-13T04:26:00.000","Title":"How do I upload and manipulate excel file with Django?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have to develop an Android application which makes use of machine learning algorithms at the back end. Now, for developing the Android app, I use Java and for implementing the machine learning algorithms I use Python.\nMy question is how to link the Python code to an Android app written in Java. That is supposed my Python code generates an output, now how to send this data to an Android application?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":347,"Q_Id":48237510,"Users Score":0,"Answer":"If you have access to python from java android app. You can write python output in file, then in java code read that file.\nOr if python output is in web, you will need some web service that provides json\/xml output, and then in java code you should call that web service.","Q_Score":0,"Tags":"java,android,python","A_Id":48238627,"CreationDate":"2018-01-13T06:37:00.000","Title":"How to link python code to android application developed in java?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am doing an example of a Simple Linear Regression in Python and I want to make use of Lambda functions to make it work on AWS so that I could interface it with Alexa. The problem is my Python package is 114 MB. I have tried to separate the package and the code so that I have two lambda functions but to no avail. I have tried every possible way on the internet.  \nIs there any way I could upload the packages on S3 and read it from there like how we read csv's from S3 using boto3 client?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":946,"Q_Id":48241838,"Users Score":0,"Answer":"There are certain limitations when using AWS lambda.\n1) The total size of your uncompressed code and dependencies should be less than 250MB.\n2) The size of your zipped code and dependencies should be less than 75MB.\n3) The total fixed size of all function packages in a region should not exceed 75GB.\nIf you are exceeding the limit, try finding smaller libraries with less dependencies or breaking your functionality in to multiple micro services rather than building code which does all the work for you. This way you don't have to include every library in each function. Hope this helps.","Q_Score":1,"Tags":"python,amazon-web-services,amazon-s3,aws-lambda","A_Id":50647228,"CreationDate":"2018-01-13T16:28:00.000","Title":"Working around AWS Lambda space limitations","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to deploy my Django site on Heroku, and thus, I need a requirements.txt file with the necessary packages that Heroku needs to install for me. I understand Django is a necessary package to be installed. Unfortunately, Django isn't included in the file when I run pip freeze > requirements.txt. Why is this? I'm not sure what to show you so you can tell me what's going wrong. Let me know and I'll add it. FYI the site hosts just fine on my local computer, so Django is definitely installed.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1475,"Q_Id":48241888,"Users Score":1,"Answer":"Sounds like you are working in a virtual environment, yet your Django dependency is installed globally. Check which Python packages are installed globally and uninstall Django (you probably don't need it globally). Then install it into your virtual environment. Now the freeze command should output Django as well.\nGeneral note: Most packages should be installed into your project virtual environment. There are only few packages where it makes sense to install them globally (eg aws management tools).","Q_Score":1,"Tags":"python,django,pip,requirements.txt","A_Id":48242094,"CreationDate":"2018-01-13T16:32:00.000","Title":"why doesn't pip freeze > requirements.txt output Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've just started to experiment with AWS SageMaker and would like to load data from an S3 bucket into a pandas dataframe in my SageMaker python jupyter notebook for analysis.\nI could use boto to grab the data from S3, but I'm wondering whether there is a more elegant method as part of the SageMaker framework to do this in my python code?\nThanks in advance for any advice.","AnswerCount":8,"Available Count":1,"Score":0.1243530018,"is_accepted":false,"ViewCount":73507,"Q_Id":48264656,"Users Score":5,"Answer":"Do make sure the Amazon SageMaker role has policy attached to it to have access to S3. It can be done in IAM.","Q_Score":53,"Tags":"python,amazon-web-services,amazon-s3,machine-learning,amazon-sagemaker","A_Id":48278872,"CreationDate":"2018-01-15T14:07:00.000","Title":"Load S3 Data into AWS SageMaker Notebook","Data Science and Machine Learning":1,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Can Python invoke the Java Framework?\nI want to know whether a Python project can invoke a Java Framework, I find a Java Framework in GitHub, whether I can use it in my Python project?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":523,"Q_Id":48265893,"Users Score":1,"Answer":"Normally Python and Java have their own interpreters\/VM's and cannot be shared. It is possible to use Jython but has limitations (fe. python version and support\/compatibility with other python packages).\nThe interpreter and JVM do not match: Java has strict typing, python not. Java compiles and run, python is an interpreter and can change code in runtime (if you want). These are extra challenges why putting all in a same environment is very complex.\nThere are possibilities like a client\/server architecture, but the feasability depends on the level of the framework. \nMost of the time low level frameworks are optimized to run directly inside your application process. Any loose coupling will introduce performance and security and compatibility issues. Just think about how reflection will work or multiple inheritance.\nIf it is a high level framework (fe able to run stand alone) it is more feasable to use some sort of client\/server. But still you have to develop a lot for it.\nIndustry standard is just to implement the framework of your desire in the language you want, then you can get also all the benefits of your platform.","Q_Score":1,"Tags":"java,python","A_Id":48266588,"CreationDate":"2018-01-15T15:23:00.000","Title":"Can Python invoke the Java Framework?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am creating an app which only needs to access the Uber API with one account, mine. Is it possible to connect to the API with my account credentials? And if not, how else can I programmatically order rides through my account?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":219,"Q_Id":48272916,"Users Score":-1,"Answer":"The Uber Api does not support oauth2 with a username and password (at least not from python)","Q_Score":0,"Tags":"python,oauth-2.0,uber-api","A_Id":48273068,"CreationDate":"2018-01-16T01:30:00.000","Title":"How to get oauth2 authorization with developer password for Uber API?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an app running on Heroku and I'm using celery together with a worker dyno to process background work.\nI'm running tasks that are using quite a lot of memory. These tasks get started at roughly the same time, but I want only one or two tasks to be running at the same time, the others must wait in the queue. How can I achieve that?\nIf they run at the same time I run out of memory and the system gets restarted. I know why it's using a lot of memory and not looking to decrease that","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1789,"Q_Id":48283696,"Users Score":3,"Answer":"Quite simply: limit your concurrency (number of celery worker processes)  to the number of tasks that can safely run in parallel on this server. \nNote that if you have different tasks having widly different resource needs (ie one task that eats a lot of ram and takes minutes to complete and a couple ones that are fast and don't require much resources at all) you might be better using two distinct nodes to serve them (one for the heavy tasks and the other for the light ones) so heavy tasks don't block light ones. You can use queues to route tasks to different celery nodes.","Q_Score":3,"Tags":"python,heroku,celery","A_Id":48284437,"CreationDate":"2018-01-16T14:38:00.000","Title":"How to limit the number of tasks that runs in celery","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am just getting started with Jupyter Notebook and I'm running into an issue when exporting.\nIn my current notebook, I alternate between code cells with code and markdown cells. (Which explain my code).\nIn the markdown cells, sometimes I will use a little HTML to display a table or a list. I will also use the bold tag <b><\/b> to emphasize a particular portion of text.\nMy problem is, when I export this notebook to PDF (via the menu in Jupyter Notebook) all of my HTML gets saved as plaintext.\nFor example, instead of displaying a table, when exporting to PDF, the HTML will be displayed instead. <tr>Table<tr> <th>part1<\/th>, etc.\nI've tried exporting to HTML instead, but even the HTML file displays the HTML as plaintext.\nI tried downloading nbconvert (which is probably what I'm doing when I use the jupter GUI anyways) and using that via terminal, but I still get the same result.\nHas anyone run into this problem before?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1850,"Q_Id":48287470,"Users Score":0,"Answer":"I fixed this myself.\nIt turns out that somewhere in the code, there was a  tag.\nAlthough it did not run the entire length of the cell, the fact that the plaintext tag was there at all changed the dynamic of the cell.\nNext, I had strange formatting errors (Text was of different size and strangely emphasized) when using = as plaintext in the cell. When opening the cell for editing, these = symbols were big bold and blue. This probably has something to do with the markdown language.\nThis was solved by placing the = on the same line as other text.\nI did have to convert the page to HTML, then use a firefox addon to convert to PDF.\nConverting to PDF from jupyter notebook uses LaTeX to transcribe the page, and all html is converted to plaintext.\nThe page appeared as normal with html tables, and normal html in the markdown cell. I just had to be careful with any extraneous tags.\nIf anyone else encounters this problem, check your html tags, and make sure that you are not accidentally doing something in markdown language.","Q_Score":0,"Tags":"python,html,pdf,jupyter-notebook,jupyter","A_Id":48291383,"CreationDate":"2018-01-16T18:16:00.000","Title":"Exporting Jupyter Notebook as either PDF or HTML makes all HTML plaintext","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am currently trying to make a learning app. The three main users would be the Admin, Teacher and Student. Should I use the django admin panel for the teachers ? It has  a lot of features and is fully customizable and I can choose what a teacher can do or not from there. Is this a correct approach ?","AnswerCount":3,"Available Count":3,"Score":1.2,"is_accepted":true,"ViewCount":754,"Q_Id":48289834,"Users Score":0,"Answer":"Yes you can use admin panel for your teachers. for this Purpose you need to mark them as staff to login in admin panel and set for them permissions you want to add them.","Q_Score":1,"Tags":"python,django","A_Id":48289880,"CreationDate":"2018-01-16T21:06:00.000","Title":"Should I use django admin panel for regular users?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am currently trying to make a learning app. The three main users would be the Admin, Teacher and Student. Should I use the django admin panel for the teachers ? It has  a lot of features and is fully customizable and I can choose what a teacher can do or not from there. Is this a correct approach ?","AnswerCount":3,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":754,"Q_Id":48289834,"Users Score":0,"Answer":"You should give an admin panel to all users. However, limit what certain users see.\nExample: Students shouldn't be able to create courses in the panel but Admins could.","Q_Score":1,"Tags":"python,django","A_Id":48289917,"CreationDate":"2018-01-16T21:06:00.000","Title":"Should I use django admin panel for regular users?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am currently trying to make a learning app. The three main users would be the Admin, Teacher and Student. Should I use the django admin panel for the teachers ? It has  a lot of features and is fully customizable and I can choose what a teacher can do or not from there. Is this a correct approach ?","AnswerCount":3,"Available Count":3,"Score":0.3215127375,"is_accepted":false,"ViewCount":754,"Q_Id":48289834,"Users Score":5,"Answer":"While you can use the admin panel for all users, I don't recommend it.  Security is tight, but not very flexible.  Also, dedicated pages developed for your user functions can be better suited for the job from both the design and functionality standpoints.\nTake the time to develop quality pages for your users. You won't regret it.","Q_Score":1,"Tags":"python,django","A_Id":48290569,"CreationDate":"2018-01-16T21:06:00.000","Title":"Should I use django admin panel for regular users?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have made a web form which, upon submit, starts a large process of operations that could result in a large batch of notifications being sent to a number of other users.\nIn order to avoid an end-user mass-submitting many times during a short time span, I would like to queue up these operations in a queue (or what?) and after a certain delay, only actually submit the latest entry.\nI am currently working on AWS and experimenting with various solutions using SQS. Unfortunately I have not been able to find a good solution.\nCurrent solution\nRight now, I am doing the following, but I am assuming I am using the wrong tool for the job:\nFirst time the user submits:\n\nBackend receives request, looks if a temporary queue exists in amazon\ncalled something like temp_queue_[user's id] \nIf true, delete this queue, then create a new queue, with a\ndelivery delay of 10    minutes, enqueue the message in this one \nIf false, the same as   above, just without deleting a queue first\n\nI then have a separate process which reloads a list of queues every 10-some minutes and actually commits any message they find.\n\nI have played around with other approaches such as trying different delivery delays, various MessageGroupIds and so forth, but I end up with the same problem which is, that one consumer will not be guaranteed to get all messages, and in flight, delayed and invisible messages are not able to be dequeued. \nFurthermore, I cannot \"filter\" messages from a queue, such as to only receive messages related to only a specific user. So I am definitely starting to think that a queue is the wrong tool. Problem is, I don't know what is.\nBest regards,","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":35,"Q_Id":48310756,"Users Score":0,"Answer":"Hard to understand what exactly you're trying to accomplish, but I think you should let the user submit through the web server to a database, and then have your timed process query that database for 'valid' submissions to process every so many minutes. Timestamp, max() and a user\/sessionId within SQL should be the only necessary elements.\nMight give one of the managed database offerings on AWS, IBM Cloud, etc. a go if you don't want to sink in the time to running your own database server.\nBest of luck.","Q_Score":0,"Tags":"python,amazon-web-services,concurrency,queue,amazon-sqs","A_Id":48311147,"CreationDate":"2018-01-17T22:03:00.000","Title":"Delay form submission and commit only the latest","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So I've currently got a flask app that I'm using to run a testing app, (this works on local host) but I cant work out how to launch it so I can test the connectivity from other devices (public).\ncan someone explain how I can go about launching it, or at least point me in the right direction to some documentation about how to make it public. I don't think I'm either port forwarding it correctly or i need a web server like xampp to run it.\nthanks","AnswerCount":3,"Available Count":2,"Score":0.0665680765,"is_accepted":false,"ViewCount":243,"Q_Id":48330515,"Users Score":1,"Answer":"to make an application works with public host you have to make sure enabling port forwarding in your modem device, you can etablish a cnx with the nginx server","Q_Score":0,"Tags":"python,flask","A_Id":48330614,"CreationDate":"2018-01-18T21:21:00.000","Title":"Launching a flask app\/website so other networks can connect","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So I've currently got a flask app that I'm using to run a testing app, (this works on local host) but I cant work out how to launch it so I can test the connectivity from other devices (public).\ncan someone explain how I can go about launching it, or at least point me in the right direction to some documentation about how to make it public. I don't think I'm either port forwarding it correctly or i need a web server like xampp to run it.\nthanks","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":243,"Q_Id":48330515,"Users Score":0,"Answer":"If you change the ip address of the flask server from the default 0.0.0.0 to your the ip address of your computer (eg 192.168.1.2) the other clients on your local network can connect.\nIf you want to expose your app the whole of the internet you should get a host that (eg try heroku.com) that has a fixed ip assigned and is reachable from the internet.","Q_Score":0,"Tags":"python,flask","A_Id":48330687,"CreationDate":"2018-01-18T21:21:00.000","Title":"Launching a flask app\/website so other networks can connect","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am able to get historical data on one stock per each request. But I need to get historical data for multiple stocks in a single request from Google finance using python.\nAny help will be highly appreciated!\nThanks","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":799,"Q_Id":48335000,"Users Score":0,"Answer":"You can't request time series data for multiple stocks from that source at once. Instead, you have to put your request into a loop. Putting your request into a loop, you can request time series stock by stock.","Q_Score":0,"Tags":"python,google-finance,google-finance-api","A_Id":48366381,"CreationDate":"2018-01-19T06:00:00.000","Title":"Get historical data for multiple stocks in single request using python from Google finance","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have django app running on ubuntu-14.04 and database is oracle.\nThe timezones are as follow\ndjango- settings - TIME_ZONE = 'UTC'\nubuntu - Asia\/Kolkata\noracle dbtimezone - UTC\noracle sessiontimezone - Asia\/Kolkata #this is via sqldeveloper\nWhile storing datetimes into db I am doing following.  \ndatetime.datetime.now(timezone.utc) \nError I get is time can not be past.\nI don't want to change the code line. I can set the timezone of my Ubuntu or oracle as that is my development env.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":281,"Q_Id":48340410,"Users Score":0,"Answer":"So finally setting my local machine's timezone to UTC with this timedatectl set-timezone UTC particular command worked.","Q_Score":0,"Tags":"python,django,oracle,datetime","A_Id":48375785,"CreationDate":"2018-01-19T11:47:00.000","Title":"Confusion about timezones oracle and django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm going to push my offline Django project to Bitbucket, and then push that repo to my live Django server. My question is, do I exclude the contents in my migrations folders? And then perform makemigrations and migrate on my live server (Ubuntu\/DigitalOcean) after the repo has been pushed to there?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":136,"Q_Id":48353603,"Users Score":0,"Answer":"No. Migrations are integral parts of your source code, they must be kept in your repo and deployed as any other part of your source.\nRemember that migrations are not restricted to generated schema change operations - some schema changes cannot be correctly generated by makemigrations and have to be manually coded, and also data migrations can only be handcoded.","Q_Score":0,"Tags":"python,django,git,digital-ocean","A_Id":48354146,"CreationDate":"2018-01-20T07:09:00.000","Title":"Do I add the files in my migrations folder to my live Django server?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on a crawler using Python to grab some data on company internal web.but when I posted all the data,it showed PLS-00306 wrong number or type of arguments in call to PM_USER_LOGIN_SP \nORA-066550:line 1, column 7\nPL\/SQL: Statement ignored\nI checked my Firefox inspector again and again, and all my request data were right, even I removed some of my request data or changed it, it returned another error code.\nIs there someone help me out what's the problem.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":28,"Q_Id":48357407,"Users Score":0,"Answer":"Oracle procedure PM_USER_LOGIN_SP has one or more parameters, each of them having its own data type. When calling that procedure, you must match number and data type of each of them.\nFor example, if it expects 3 parameters, you can't pass only 2 (nor 4) of them (because of wrong number of arguments (parameters)).\nIf parameter #1 is DATE, you can't pass letter A to it (because of a wrong type). Note that  DATEs are kind of \"special\", because something that looks like a date to us, humans (such as 20.01.2018, which is today) passed to Oracle procedure's DATE data type parameter must really be a date. '20.01.2018' is a string, so either pass date literal, such as DATE '2018-01-20' or use appropriate function with a format mask, TO_DATE('20.01.2018', 'dd.mm.yyyy').\nTherefore, have a look at the procedure first, pay attention to what it expects. Then check what you pass to it.","Q_Score":0,"Tags":"python,html,sql,asp.net","A_Id":48359205,"CreationDate":"2018-01-20T14:41:00.000","Title":"Return PLS-00306 During login in with python","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was trying to make all fields in a form view read-only in odoov10. Is there any python method through I can get all the form view fields and change its attribute to readonly=\"True\"?","AnswerCount":4,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":4994,"Q_Id":48366535,"Users Score":0,"Answer":"On Odoo 12 it works only by setting readonly=\"True\" (<- CamelCase). Using edit=\"False\" nothing happens...","Q_Score":0,"Tags":"python,xml,odoo-10","A_Id":57324645,"CreationDate":"2018-01-21T12:01:00.000","Title":"How to make all fields readonly in form view odoo?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have been using Django Postman for a few weeks now, and in order to limit the number of messages sent by each user, I have been wondering what would be the best way to limit the number of messages a user can send a day, a week... using Django-postman? \nI have been browsing dedicated documentation for weeks too in order to find an answer for the how, but I think this is not a usecase for now, and I do not really know how to manage that. \nOf course I am not looking for a well cooked answer, but I would like to avoid writing labyrinthine code, so maybe just a few ideas about it could help me to see clear through that problematic.\nMany thanks for your help on that topic!","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":427,"Q_Id":48370499,"Users Score":0,"Answer":"as a simple idea the  inserting of new msg in database should be with a condition to limit their numbers (the count of the previous msg  isn't > max )\n another method : you will show the input of the msg jsut when  (selet * form table where userid=sesion and count(usermsg)< max )","Q_Score":3,"Tags":"python,django,django-apps","A_Id":48372180,"CreationDate":"2018-01-21T18:54:00.000","Title":"Is it possible to limit the number of messages a user can send a day with Django postman?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am getting the following error message when i try to install Beautifullsoup via mac terminal.\n[Errno 13] Permission denied: '\/Library\/Python\/2.7\/site-packages\/test-easy-install-40423.pth'\nPlease help.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":33,"Q_Id":48371880,"Users Score":1,"Answer":"In linux you can use the sudo command to bypass any permission issues, I believe that same can be said for mac os. Just add into your terminal sudo \"command\" this will basically install it as \"super user\" hence you shouldn't have an issue reading and writing to files at certain locations.","Q_Score":0,"Tags":"java,python,macos,beautifulsoup","A_Id":48371962,"CreationDate":"2018-01-21T21:25:00.000","Title":"Beautifull soup install mac error","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it possible to delete an item from DynamoDB using the Python Boto3 library by specifying a secondary index value? I won't know the primary key in advance, so is it possible to skip the step of querying the index to retrieve the primary key, and just add a condition to the delete request that includes the secondary index value?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":1939,"Q_Id":48384337,"Users Score":2,"Answer":"No, as of now it's not possible. \nYou have to specify the primary key to delete an item, although you can optionally pass ConditionExpression to prevent it from being deleted if some condition is not met. Only this much flexibility api is providing us.","Q_Score":1,"Tags":"python,boto,boto3","A_Id":48384477,"CreationDate":"2018-01-22T14:53:00.000","Title":"Is it possible to delete a DynamoDB item based on secondary index with Python Boto3 lib?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am currently building a web application built on Flask Framework with around 10 user accounts in the future when the application has been finished.\nThere is a Class with heavy module (Compute-intensive), built and used in this application, served as one of the frequently used key features, and I have run into some issues and am seeking for some solutions (let's named it as Class A in file a.py)\nOriginally, I imported the Class A directly into one of the view file, and created a route function for it, that once an user clicks the button which invokes this route, the route function will then create an instance of Class A, and this instance runs based on received data (like Json). But I found the system can be slow down as the instance of Class A has to be created every single time when the user uses the feature frequently, (also there can be 10 users), and Class A is too heavy to be created again and again.\nTherefore I am thinking is there anyway that I can create the instance of Class A for only one time (e.g., the time that the Flask application starts), and each logged in user can access this instance rather than create it over and over again?\nThanks in advance","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":1798,"Q_Id":48394464,"Users Score":1,"Answer":"Flask Requests are stateless, so to preserve data for a user across requests the options are limited. Here are some ideas: \n\nSerialize the class instance, store it in a flask session (just a wrapper for browser session cookies), retrieve later. \nStore it in a database, retrieve later when needed\nPickle it, dump it using user name, retrieve when needed. \n\nAlternatively, depending on the application, a cache solution might good enough (ig\n Flask-caching). The route\/view would instantiate the class the first time it's called and return a value. \nIf the view is called again with the same arguments\/data, the previous return value is returned without running the view function again.","Q_Score":1,"Tags":"python,class,flask","A_Id":48394534,"CreationDate":"2018-01-23T04:51:00.000","Title":"How to maintain a Class instance for each User's session in Flask?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've been working on a website which allows users to play a game against a \"Machine\" player and I decided to do this using django 1.12 and python 3.6 in an attempt to develop skills in this area. The game & ML algorithms run on the backend in python and during testing\/dev this all worked fine. When pushing this to heroku it became apparent that the instance from the game and other classes were being instantiated correctly but then as the page refreshes, in order to get the machine player's choice from the server, the request would go to another server which didn't have the instantiated objects. I tried using the default cache to allow the player to access the same instance but I believe it might be too large. After some reading it sounds like memcached is the way forward, but I wondered whether anyone might have any suggestions or know if there's a simpler solution?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":29,"Q_Id":48403728,"Users Score":0,"Answer":"For each request, Django create a new HttpRequest object and load new instances of corresponding views. You can't share data between requests without putting them in a persistent storage.","Q_Score":0,"Tags":"python,django,heroku","A_Id":48406138,"CreationDate":"2018-01-23T14:08:00.000","Title":"Accessing the same instance of a class django, python, heroku","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Python 2.7 here (which is very relevant).\nLet's say I have a string containing an \"em\" dash, \"\u2014\". This isn't encoded in ASCII. Therefore, when my Django app processes it, it complains. A lot.\nI want to to replace some such characters with unicode equivalents for string tokenization and use with a spell-checking API (PyEnchant, which considers non-ASCII apostrophes to be misspellings), for example by using the shorter \"-\" dash instead of an em dash. Here's what I'm doing:\ns = unicode(s).replace(u'\\u2014', '-').replace(u'\\u2018', \"'\").replace(u'\\u2019', \"'\").replace(u'\\u201c', '\"').replace(u'\\u201d', '\"')\nUnfortunately, this isn't actually replacing any of the unicode characters, and I'm not sure why.\nI don't really have time to upgrade to Python 3 right now, importing unicode_literals from future at the top of the page or setting the encoding there does not let me place actual unicode literals in the code, as it should, and I have tried endless tricks with encode() and decode().\nCan anyone give me a straightforward, failsafe way to do this in Python 2.7?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":407,"Q_Id":48404474,"Users Score":0,"Answer":"Oh boy... false alarm, here! It actually works, but I entered some incorrect character codes. I'm going to leave the question up since that code is the only thing that seemed to let me complete this particular task in this environment.","Q_Score":0,"Tags":"django,python-2.7,unicode,python-unicode,pyenchant","A_Id":48405718,"CreationDate":"2018-01-23T14:48:00.000","Title":"Replacing unicode characters with ascii characters in Python\/Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My task is to extract full songs from radio streaming using python 2.7.\nI have managed to record radio streaming, but I can't find a good way to detect if the audio that I record is music, ads, or just talking. \nI tried to detect by threshold, but it wasn't good because there are not enough silence between the talking or the ads to the songs.\nIf someone knows a good solution for me I would love to hear about it.\nimport pydub\nstreamAudio = pydub.AudioSegment.from_mp3(\"justRadioStream.mp3\")\nlistMp3 = pydub.silence.detect_silence(streamAudio, min_silence_len=400, silence_thresh=-38)\nprint listMp3\nI tried to play with the min_silence_len and silence_thresh, but there is not enough time of silence between songs and ads or talking, or louder voice to detect properly\nthanks a lot!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":203,"Q_Id":48417561,"Users Score":0,"Answer":"This is not the kind of problem that will be solved in a couple of lines of Python.  The problem is under-specified - there's no guarantee that there will even be silence between songs, ads and announcers on any given radio stream, as they try to make it harder to usefully record full songs from their streams for piracy purposes.\nTo do this robustly, it's likely that you'll need to apply AI \/ deep learning techniques to distinguish music from ads and announcements.  Even then it's tricky, as some music will have regular talking in it, some songs are short, and some ads are long and contain music.","Q_Score":0,"Tags":"python","A_Id":48418721,"CreationDate":"2018-01-24T08:08:00.000","Title":"python extract songs from radio streaming","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a web application that I developed for use on a Raspberry Pi written in Python and hosted on nginx.  It's a bit slow to serve new pages, even when there is very little to no logic being processed for the page that's loading (4-5 seconds+). \nI know that's a common problem as Pi's aren't exactly equipped to handle the load required to deliver web pages super quickly, but I was wondering if anyone had any experience with this and if it would be worthwhile to recreate the app in some other environment?  I was wondering if perhaps a nodejs server would be significantly (a few seconds) quicker in general, or building a single page application using react would be worthwhile? Or if there is some other solution that would be even faster?\nEDIT:\nmore info: raspberry pi 3, json for storing\/reading data (very small amounts of data), running chrome, only one user interacting directly with the app, and on the device itself (not from the internet or another network)","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":99,"Q_Id":48446691,"Users Score":3,"Answer":"If the frontend will run on a browser executed on a laptop o desktop it will run fine, but if the interface will run on a browser executed on the Pi maybe it will be too expensive in terms of GPU\/CPU usage and it will require fine tuning in order to avoid unnecessary re-renders.\nSo if the browser is on a remote machine ok, if not think about a something like TkInter for UI.","Q_Score":0,"Tags":"javascript,python,nginx,web,raspberry-pi","A_Id":48447114,"CreationDate":"2018-01-25T15:41:00.000","Title":"Web Interface on the Raspberry Pi","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm getting ready to move my Django project from my laptop to my server.  What is the recommended way to do this?  E.g., is there a Django command that will package everything up (and select the correct settings file for test vs prod servers) and create a zip or tar file that can be moved over to the server?  Sort of like Ant for building Java projects.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":120,"Q_Id":48450010,"Users Score":2,"Answer":"I recommend using virtual environment for your Django project.\nsource bin\/activate your virtual environment in your server would simulate the same setup as of your local.\nIn your project\n\nList all your dependencies in requirements.txt and settings in my_settings.py apart from django settings.py\n\nIn your server\n\njust pull\/transfer your code via git or any other means and activate virtual environment.\n\n pip install -r reuirements.txt and change any minor changes required in my_settings\n\nTake care of your migrations and Db  setup. You may have to run migrations if you are migrating to your server for the first time.\n\n\nAnd thats it you are up and running.","Q_Score":2,"Tags":"python,django,deployment","A_Id":48450115,"CreationDate":"2018-01-25T18:55:00.000","Title":"Packaging Django code for deployment","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a java program and I need it to get some data calculated by a python script. \nI've already got java to send an integer to python via jython's PythonInterpreter and displayed it, but I can't recover it to make other operations. Also, it would be great to send a full integer array rather than a single integer but I can't wrap my mind arround PyObjects and how to use them.\nIs there any useful tutorial that covers arrays? I've been searching for a while but I just find integer and float related tutorials.","AnswerCount":3,"Available Count":3,"Score":0.0665680765,"is_accepted":false,"ViewCount":298,"Q_Id":48453620,"Users Score":1,"Answer":"If you want a simple solution then I suggest that you write and read the integers to a file. Perhaps not the most elegant way but it would only take a couple of minutes to implement.","Q_Score":0,"Tags":"java,python,arrays,jython","A_Id":48453704,"CreationDate":"2018-01-25T23:32:00.000","Title":"How can I send a data array back and forth between java and python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a java program and I need it to get some data calculated by a python script. \nI've already got java to send an integer to python via jython's PythonInterpreter and displayed it, but I can't recover it to make other operations. Also, it would be great to send a full integer array rather than a single integer but I can't wrap my mind arround PyObjects and how to use them.\nIs there any useful tutorial that covers arrays? I've been searching for a while but I just find integer and float related tutorials.","AnswerCount":3,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":298,"Q_Id":48453620,"Users Score":0,"Answer":"If the solution of writing\/reading the numbers to a file somehow is not sufficient, you can try the following:\nInstead of using Jython, you can use Pyro4 (and the Pyrolite client library for your java code) to call a running Python program from your java code.\nThis allows you to run your python code in a 'normal' python 3.6 interpreter for instance, rather than being limited to what version Jython is stuck on.\nYou'll have to launch the Python interpreter in a separate process though (but this could very well even be on a different machine)","Q_Score":0,"Tags":"java,python,arrays,jython","A_Id":48453799,"CreationDate":"2018-01-25T23:32:00.000","Title":"How can I send a data array back and forth between java and python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a java program and I need it to get some data calculated by a python script. \nI've already got java to send an integer to python via jython's PythonInterpreter and displayed it, but I can't recover it to make other operations. Also, it would be great to send a full integer array rather than a single integer but I can't wrap my mind arround PyObjects and how to use them.\nIs there any useful tutorial that covers arrays? I've been searching for a while but I just find integer and float related tutorials.","AnswerCount":3,"Available Count":3,"Score":0.0665680765,"is_accepted":false,"ViewCount":298,"Q_Id":48453620,"Users Score":1,"Answer":"I've worked on similar project. Here's brief outline of what Java and Python was doing respectively.\nJava\nWe used Java as a main server for receiving requests from clients and sending back responses after some data manipulation. \nPython\nPython was in charge of data manipulation or calculation. Data was sent from Java via socket network. We first defined the data we needed in string format, then cncerted them into bytes in order to have them semt via socket network. \nSince there were limitations, though, using socket network, I changed it to Rest Api using Python Flask. In that way we could easily communicate with, not only but in this case mainly, Java with key-value json format. In this way, I was able to recieve any data type that could be passed through Api including array object you mentioned.","Q_Score":0,"Tags":"java,python,arrays,jython","A_Id":48454007,"CreationDate":"2018-01-25T23:32:00.000","Title":"How can I send a data array back and forth between java and python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Flask application running on AWS Application Load Balancer, but can't get web sockets to work. After reading several posts and configuring Load Balancers, Target Groups, stickiness on EC2, I came to the conclusion that it might be that ALB is not staring the application correctly.\nFlask-SocketIo says to use socketio.run(application, host='0.0.0.0', port=port) to start up the web server as it encapsulates application.run(). But after further reading I found that EC2 already calls application.run() without the need of explicitly doing so in the start up script, and therefore it might just bypassing my socketio.run() and not be starting my web server.\nCould this be the case? How can I verify it and make sure socketio is started properly?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":648,"Q_Id":48459764,"Users Score":0,"Answer":"To access the application via Load Balancer you have to make sure first that your target in Target Group is healthy. The health status is displayed in AWS Web console on your target group instance details on Targets tab.\nIf there are no targets in your Target Group, add one by pressing Edit button and selecting your EC2 instance from the list. Don't forget to use the appropriate port. Also make sure health checks are configured correctly (path, port...). You can find them on Health Checks tab of your target group details page.\nIf all above is ok and you have a healthy target in TG, but the ELB doesn't show your application, I'd recommend you to SSH to your EC2 instance with Flask app and check if that one is running correctly.","Q_Score":1,"Tags":"python,amazon-ec2,websocket,amazon-elb","A_Id":48469075,"CreationDate":"2018-01-26T10:41:00.000","Title":"flask-socketio run on Application Load Balancer","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a desktop app that is built on top of Django framework and frozen to .exe using PyInstaller. The idea behind it, that an application should connect to remote database(PostgreSQL) on VPS. That VPS is serving static files for this application too. So here is the question - is that option secure? Can potential hackers connect to my database and make a mess in it or replace original DB with the fake one? If they can, how should I fix that?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":119,"Q_Id":48467301,"Users Score":1,"Answer":"It is not safe to connect to a remote database in a scenario that you are describing.\nFor a potential hacker its a piece of cake to figure out the credentials of the remote database that you are using.\nAnd to answer your question it will be difficult for the hacker to replace the DB with a fake one. But it wont stop him from getting all the data from your DB and modifying it.\nWhat you should do is to have a rest-api endpoint or a grapghql endpoint to interact with the database. and you can hit that endpoint from the client app.","Q_Score":1,"Tags":"python,sql,django,security","A_Id":48467379,"CreationDate":"2018-01-26T18:20:00.000","Title":"Let desktop app based on Django, connect to remote DB is secure?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I know this is sort of counter to the purpose of headless automation, but...\nI've got an automation test running using Selenium and Chromedriver in headless mode. I'd prefer to keep it running headless, but occasionally, it runs into an error that really needs to be looked at and interacted with. Is it possible to render and interact with a headless session? Maybe by duplicating the headless browser in a non-headless one? I can connect through remote-debugging, but the Dev Tools doesn't seem to do allow me to view the rendered page or interact with anything.\nI am able to take screenshots, which sort of helps. But I'm really looking for the ability to interact--there's some drag-and-drop elements that aren't working well with Selenium that are causing issues occasionally.","AnswerCount":3,"Available Count":1,"Score":0.1325487884,"is_accepted":false,"ViewCount":3716,"Q_Id":48467961,"Users Score":2,"Answer":"What you are asking for is currently not possible. Further, such a \"feature\" would have nothing to do with Selenium, but the vendor of the browser. You can search their bug tracker to see if such a feature has already been requested.\nThe only currently available option is to run full GUI browser during debug \/ development of your tests.","Q_Score":4,"Tags":"python,selenium,headless,browser-automation","A_Id":48468760,"CreationDate":"2018-01-26T19:06:00.000","Title":"Possible to open\/display\/render a headless Selenium session?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a table in my HTML and I want to put a float variable into a column. I also want this variable to justify itself to the right. \nCurrently, I am trying {{ float|floatformat:2|rjust }}, but it keeps throwing up a TemplateSyntaxError. Is it even possible to do this via the template system, or will I just have to use some CSS styling for this?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":855,"Q_Id":48481765,"Users Score":0,"Answer":"{{ value|rjust:\"10\" }} didn't work for me so I had to format the string before being passed to the HTML page.\nI first right aligned the string with an arbitrary character:\namount.rjust(12, '$')\nAnd then replace the character with \"&nbsp;\"\namount.replace('$', '&nbsp;')","Q_Score":0,"Tags":"django,python-3.x,django-templates","A_Id":68304143,"CreationDate":"2018-01-27T23:52:00.000","Title":"Format a float to justify to the right","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to deploy a simple python bot on Heroku but I get the error\ncouldn't find that process type \nWhen I try to scale the dynos. I already made a procfile and it looks like this:\nweb: gunicorn dep:app, where \"dep\" is the name of my python code  \nWhat could be the reason?","AnswerCount":6,"Available Count":3,"Score":1.0,"is_accepted":false,"ViewCount":49734,"Q_Id":48512013,"Users Score":7,"Answer":"Make Sure Procfile should not have any extension like .txt\notherwise this will be the error\nremote: -----> Discovering process types\n remote:        Procfile declares types -> (none)\nTo create file without extension type following in cmd \n notepad Procfile.\n\nNow add web: gunicorn dep:app and save\nNow when you will git push heroku master the above lines will be like\nremote: -----> Discovering process types\n remote:        Procfile declares types -> web\nAnd the error is gone when you will run\nC:\\Users\\Super-Singh\\PycharmProjects\\URLShortener>heroku ps:scale web=1\nScaling dynos... done, now running web at 1:Free","Q_Score":22,"Tags":"python,heroku","A_Id":50388192,"CreationDate":"2018-01-30T00:10:00.000","Title":"Couldn't find that process type, Heroku","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm trying to deploy a simple python bot on Heroku but I get the error\ncouldn't find that process type \nWhen I try to scale the dynos. I already made a procfile and it looks like this:\nweb: gunicorn dep:app, where \"dep\" is the name of my python code  \nWhat could be the reason?","AnswerCount":6,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":49734,"Q_Id":48512013,"Users Score":0,"Answer":"While it's not Python, in my case, I had heroku\/java followed by heroku\/pgbouncer. In Heroku's Settings, I switched them so heroku\/pgbouncer was on top. This fixed the issue. Perhaps your buildpacks need to be ordered differently if you are using multiple.","Q_Score":22,"Tags":"python,heroku","A_Id":71761780,"CreationDate":"2018-01-30T00:10:00.000","Title":"Couldn't find that process type, Heroku","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm trying to deploy a simple python bot on Heroku but I get the error\ncouldn't find that process type \nWhen I try to scale the dynos. I already made a procfile and it looks like this:\nweb: gunicorn dep:app, where \"dep\" is the name of my python code  \nWhat could be the reason?","AnswerCount":6,"Available Count":3,"Score":1.0,"is_accepted":false,"ViewCount":49734,"Q_Id":48512013,"Users Score":56,"Answer":"This may happen if your procfile is misspelt, such as \"procfile\" or \"ProcFile\" etc. The file name should be \"Procfile\" (with a capital P).\nsometimes changing the file name is not anough, because git wouldn't spot the change. I had to delete the Procfile completely, then commit the change, than add it again with the right name, and then commit that again:\n\nremove your procfile\ngit commit\nadd a new procfile with the exact name \"Procfile\"\ncommit again\ngit push heroku master (or main - new heroku projects now uses main)\n\nshould work!","Q_Score":22,"Tags":"python,heroku","A_Id":53184918,"CreationDate":"2018-01-30T00:10:00.000","Title":"Couldn't find that process type, Heroku","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am trying to give temporary download access to a bucket in my s3.\nusing boto3.generate_presigned_url(), I have only managed to download a specific file from that bucket but not the bucket itself.\nis there any option to do so or my only option is to download the bucket content, zip it, upload it, and give access to the zip?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1170,"Q_Id":48517407,"Users Score":0,"Answer":"Have you tried cycling through the list of items in the bucket?\ndo a aws s3 ls <bucket_name_with_Presigned_URL> and then use a for loop to get each item.\nHope this helps.","Q_Score":0,"Tags":"python,amazon-web-services,amazon-s3,boto3,pre-signed-url","A_Id":52748706,"CreationDate":"2018-01-30T08:57:00.000","Title":"boto3 python generate pre signed url for a whole bucket","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am executing a Python-Tensorflow script on Amazon Sagemaker.  I need to checkpoint my model to the S3 instance I am using, but I can't find out how to do this without using the Sagemake Tensorflow version.\nHow does one checkpoint to an S3 instance without using the Sagemaker TF version?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":895,"Q_Id":48525733,"Users Score":0,"Answer":"Create an object in S3 and enable versioning to the bucket. Everytime you change the model and save it to S3, it will be automatically versioned and stored in the bucket. \nHope it helps.","Q_Score":0,"Tags":"python,tensorflow,amazon-s3,amazon-sagemaker","A_Id":48531968,"CreationDate":"2018-01-30T16:03:00.000","Title":"TensorFlow Checkpoints to S3","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Here's my problem.\nI have a small javascript game, which I am trying to pair with Django backend, to store highscores in sessions, maybe implement a highscore board, login, etc. in future. Just as a practice of interaction between front\/backend.\nSo far I have the game running in javascript, and my plan is this: upon getting a score, it sends an ajax (jQuery) request to django, telling django to increment the score. Now here's few questions I have in mind:\n\nIs it possible to render the highscore to template with Django\/DTL? Score is set at 0, and each time a player scores, ajax-call to django backend will increment the score by one, and render it in template without refreshing the page. (Also compare it to highscore in sessions, and overwrite it if the new score is higher)\nTo my understanding, it requires a page refresh, which is not what I want.\nShould I increment the score in frontend with JS, and after a game ends, send the score to django backend to compare it with the one in sessions etc etc.\nCan javascript access values of django view? JSON maybe?\n\nI'm still hesitating if I am heading to the right direction, so if you guys could just point me to the right direction. What would be the best way to implement this?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":733,"Q_Id":48529455,"Users Score":0,"Answer":"I think it's bad practice to continuously ping the server like that. Especially considering that with something like a game, a lot of things can be changing very quickly. Your best bet is to keep track of what's going on in the front end, and then ping the server as needed to send or request information, query the database, etc (in other words, go with number 2, except you won't need to \"compare\" it with what's going on in the session, you'd simply be saving the finished game information to your database.)\nAll in all it depends on the complexity of the game and how you decide to structure it.","Q_Score":0,"Tags":"javascript,jquery,python,ajax,django","A_Id":48529535,"CreationDate":"2018-01-30T19:50:00.000","Title":"Pairing up Django backend with frontend","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have automation scripts where the implicitly_wait is parametrized so that the user will be able to set it. I have a default value of 20 seconds which I am aware of but there is a chance that the user has set it with a different value.\nIn one of my methods I would like to change the implicitly_wait (to lower it as much as possible) and return it to the value before the method was called. In order to do so I would like to save the implicitly_wait value before I change it. This is why I am looking for a way to reach to it.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":31,"Q_Id":48542904,"Users Score":0,"Answer":"After reading through the Selenium code and playing in the interpreter, it appears there is no way to retrieve the current implicit_wait value. This is a great opportunity to add a wrapper to your framework. The wrapper should be used any time a user wants to change the implicit wait value. The wrapper would store the current value and provide a 'getter' to retrieve the current value. Otherwise, you can submit a request to the Selenium development team...","Q_Score":0,"Tags":"python,python-3.x,selenium","A_Id":48543491,"CreationDate":"2018-01-31T13:04:00.000","Title":"How can I view the implicitly_wait that the webdriver was set with?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using python-social-auth to allow users to login via SAML; everything's working correctly, except for the fact that if a logged-in user opens the SAML login page and logs in again as a different user, they'll get an association with both of the SAML users, rather than switch login.\nI understand the purpose behind this (since it's what you can normally do to associate the user with different auth services) but in this case I need to enforce a single association (ie. if you're logged in with a given SAML IdP, you cannot add another association for the same user with the same provider).\nIs there any python-social-auth solution for this, or should I cobble together something (for instance, preventing logged-in users from accessing the login page)?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":187,"Q_Id":48559911,"Users Score":0,"Answer":"There's no standard way to do it in python-social-auth, there are a few alternatives:\n\nOverride the login page and if there's a user authenticated, then log them out first, or show an error, whatever fits your projects.\nAdd a pipeline function and set it in the top that will act if user is not None, you can raise an error, logout the user, etc.\nOverride the backend and extend the auth_allowed method in it return False if there's a valid user instance at self.strategy.request.user. This will halt the auth flow and AuthForbidden will be raised.","Q_Score":0,"Tags":"django,python-social-auth","A_Id":48586214,"CreationDate":"2018-02-01T09:58:00.000","Title":"Python-social-auth: do not reassociate existing users","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In my Django project, there are several django apps. I want to write custom error pages, and I want them to contain correct links to the application that the errors happened in, for example, if a 500-error happened in my app a, I want the error page contain a link to \/a\/index.html, and if a server error happened in app b, I want the page to contain the link to \/b\/index.html. And I want to create only one copy of each of the error page files, which means I need to get the name of the app from within the template.\nTo that end, I have written a custom context processor that adds the app_name var to the templates. I tested it on my normal pages, but when I went on to test it on the error pages, turns out that the context processor isn't firing. \nSimilarly, I have written a template tag app_aware_url which takes the name of the url pattern and tries to resolve it, but again, turns out that for the error pages the simple_tag(takes_context=True) receives a context that does not contain the request (which is needed for telling which app I am in).\nIs there a way round it, or is there a better solution to my problem altogether?\n(Django is 1.11)","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":713,"Q_Id":48560250,"Users Score":0,"Answer":"For those who may step on the same rakes: \nWhat I ended up doing is passing the \"app_name\" variable from the error page views to the context. Thus the variable is in the context for non-error pages, because it is set by the context processor, and it is there for error pages because it is passed manually. Doesn't look like a good solution though.","Q_Score":0,"Tags":"python,django","A_Id":48562022,"CreationDate":"2018-02-01T10:16:00.000","Title":"Django: Context processors for error pages (or request in simple_tag)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I ma trying to wrap my head round the Django Framework and mapping it out on an architecture diagram. I am struggling to understand where the API calls are place (Model or View) and would like some guidance on this.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":17,"Q_Id":48568959,"Users Score":1,"Answer":"You can think of API calls as views that strictly return data.","Q_Score":0,"Tags":"python,django,python-3.x,django-models,django-views","A_Id":48572156,"CreationDate":"2018-02-01T17:55:00.000","Title":"Which Layer does API access sit in?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a web application that runs locally only (does not run on a remote server). The web application is basically just a ui to adjust settings and see some information about the main application. Web UI was used as opposed to a native application due to portability and ease of development. Now, in order to start and stop the main application, I want to achieve this through a button in the web application. However, I couldn't find a suitable way to start a asynchronous and managed task locally. I saw there is a library called celery, however that seems to be suitable to a distributed environment, which mine is not.\nMy main need to be able to start\/stop the task, as well as the check if the task is running (so I can display that in the ui). Is there any way to achieve this?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":631,"Q_Id":48572082,"Users Score":1,"Answer":"celery can work just fine locally. Distributed is just someone else's computer after all :)\nYou will have to install all the same requirements and the like. You can kick off workers by hand, or as a service, just like in the celery docs.","Q_Score":1,"Tags":"python,django","A_Id":48572125,"CreationDate":"2018-02-01T21:33:00.000","Title":"Django asynchronous tasks locally","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm trying to scrape Facebook public page likes data using Python. My scraper uses the post number in order to scrape the likes data. However, some posts have more than 6000 likes and I can only scrape 6000 likes, also I have been told that this is due to Facebook restriction which doesn't allow to scrape more than 6000 per day. How can I continue scrape the likes for the post from the point the scraper stop scraping.","AnswerCount":2,"Available Count":1,"Score":-0.0996679946,"is_accepted":false,"ViewCount":1695,"Q_Id":48577599,"Users Score":-1,"Answer":"In tags I see facebook-graph-api, which has limitations. Why don't you use requrests + lxml? It would be such easier, and as you want to scrape public pages, you don't even have to login, so it could be easily solve.","Q_Score":0,"Tags":"python,facebook-graph-api,scrape","A_Id":48578008,"CreationDate":"2018-02-02T07:19:00.000","Title":"scrape facebook likes with python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have seen a few variants of my question but not quite exactly what I am looking for, hence opening a new question. \nI have a Flask\/Gunicorn app that for each request inserts some data in a store and, consequently, kicks off an indexing job. The indexing is 2-4 times longer than the main data write and I would like to do that asynchronously to reduce the response latency. \nThe overall request lifespan is 100-150ms for a large request body.\nI have thought about a few ways to do this, that is as resource-efficient as possible:\n\nUse Celery. This seems the most obvious way to do it, but I don't want to introduce a large library and most of all, a dependency on Redis or other system packages. \nUse subprocess.Popen. This may be a good route but my bottleneck is I\/O, so threads could be more efficient.\nUsing threads? I am not sure how and if that can be done. All I know is how to launch multiple processes concurrently with ThreadPoolExecutor, but I only need to spawn one additional task, and return immediately without waiting for the results. \nasyncio? This too I am not sure how to apply to my situation. asyncio has always a blocking call. \nLaunching data write and indexing concurrently: not doable. I have to wait for a response from the data write to launch indexing. \n\nAny suggestions are welcome!\nThanks.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":500,"Q_Id":48584712,"Users Score":0,"Answer":"Celery will be your best bet - it's exactly what it's for.\nIf you have a need to introduce dependencies, it's not a bad thing to have dependencies.  Just as long as you don't have unneeded dependencies.\nDepending on your architecture, though, more advanced and locked-in solutions might be available.  You could, if you're using AWS, launch an AWS Lambda function by firing off an AWS SNS notification, and have that handle what it needs to do.  The sky is the limit.","Q_Score":0,"Tags":"python,multithreading,asynchronous","A_Id":48588092,"CreationDate":"2018-02-02T14:23:00.000","Title":"Flask: spawning a single async sub-task within a request","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a problem in installing extenstions like flask-mail when using pip install ; when I wrote the command there is no error but nothing happened .what is the problem?","AnswerCount":1,"Available Count":1,"Score":0.537049567,"is_accepted":false,"ViewCount":359,"Q_Id":48593824,"Users Score":3,"Answer":"If you are using Pycharm, an alternative way to install an extension is the following:\n\nFile --> Settings --> Project: \"Your project name\" --> Project Interpreter\nClick the '+' icon and search for 'Flask-Mail'\nClick Install Package","Q_Score":1,"Tags":"python,pip,pycharm,flask-mail","A_Id":48593919,"CreationDate":"2018-02-03T04:06:00.000","Title":"Pycharm extension installation","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"For the first time, I made an environment for Django with virtualbox and vagrant (CentOS 7).  \nBut every tutorial I saw says I need to use pyenv or virtualenv. I think they are used to make a virtual environment for Django. But I don't know why I need to use pyenv or virtualenv. (For example, Cakephp3 doesn't need packages like pyenv or virtualenv.)  \nAnd I was using virtualbox and vagrant, which are already virtual environment, so I think I was making virtual environment inside another virtual environment. I am not sure if this is meaningful. Maybe pyenv and virtualenv are not necessary if I am using virtual environment like virtualbox or vmware?\nAre they essential for Django? When I deploy Django in actual server, do I still need to use pyenv or virtualenv?","AnswerCount":4,"Available Count":4,"Score":1.2,"is_accepted":true,"ViewCount":717,"Q_Id":48594395,"Users Score":3,"Answer":"It is not essential but it is recommended to work in a virtual environment when you start working on Django projects.\n\nImportance of the virtual environment.\n\n\nA virtual environment is a way for you to have multiple versions of python on your machine without them clashing with each other, each version can be considered as a development environment and you can have different versions of python libraries and modules all isolated from one another.\nIn a most simple way, a virtual environment provides you a development environment independent of the host operating system. You can install and use the necessary softwares in the \/bin folder of the virtualenv, instead of using the software installed on the host machine.\nMany a time different projects need different versions of the same package and keeping every projects in seperate virtual environements helps a lot.\n\nIt is strongly recommended to set up separate virtualenv for each project. Once you are used to it, it will seem fairly trivial and highly useful for development, removing a lot of future headaches.","Q_Score":1,"Tags":"python,django,virtualenv","A_Id":48594464,"CreationDate":"2018-02-03T05:54:00.000","Title":"Is pyenv or virtualenv essential for Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"For the first time, I made an environment for Django with virtualbox and vagrant (CentOS 7).  \nBut every tutorial I saw says I need to use pyenv or virtualenv. I think they are used to make a virtual environment for Django. But I don't know why I need to use pyenv or virtualenv. (For example, Cakephp3 doesn't need packages like pyenv or virtualenv.)  \nAnd I was using virtualbox and vagrant, which are already virtual environment, so I think I was making virtual environment inside another virtual environment. I am not sure if this is meaningful. Maybe pyenv and virtualenv are not necessary if I am using virtual environment like virtualbox or vmware?\nAre they essential for Django? When I deploy Django in actual server, do I still need to use pyenv or virtualenv?","AnswerCount":4,"Available Count":4,"Score":0.0996679946,"is_accepted":false,"ViewCount":717,"Q_Id":48594395,"Users Score":2,"Answer":"No, it's not essential to use virtualenv for Django but it's recommended because it isolates the multiple versions of python or libraries you are using for your projects on your system. If you are not using virtualenv then that library will be the part of your python home directory.\nFor Example:\nIf you are using version 1 of some library for one project and later on in other projects you have to use or if it's the requirement to use version 2 of that library then using specific virtualenv (if you are working on multiple projects simultaneously) for that project enables you to use multiple libraries without any problem.","Q_Score":1,"Tags":"python,django,virtualenv","A_Id":48594552,"CreationDate":"2018-02-03T05:54:00.000","Title":"Is pyenv or virtualenv essential for Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"For the first time, I made an environment for Django with virtualbox and vagrant (CentOS 7).  \nBut every tutorial I saw says I need to use pyenv or virtualenv. I think they are used to make a virtual environment for Django. But I don't know why I need to use pyenv or virtualenv. (For example, Cakephp3 doesn't need packages like pyenv or virtualenv.)  \nAnd I was using virtualbox and vagrant, which are already virtual environment, so I think I was making virtual environment inside another virtual environment. I am not sure if this is meaningful. Maybe pyenv and virtualenv are not necessary if I am using virtual environment like virtualbox or vmware?\nAre they essential for Django? When I deploy Django in actual server, do I still need to use pyenv or virtualenv?","AnswerCount":4,"Available Count":4,"Score":0.049958375,"is_accepted":false,"ViewCount":717,"Q_Id":48594395,"Users Score":1,"Answer":"VirtualBox isolates your development operating system from your normal operating system. Virtualenv isolates your project's Python packages from the system Python packages.\nMany Linux distributions install Python packages as dependencies for other software into the system-wide site-packages directory. Python doesn't have a way to version packages with the same name, so you will run into problems when your project depends on package==10.0.0 but your distribution already installed package==0.0.2 that you cannot upgrade without breaking something.\nVirtual environments are extremely lightweight. They're really just a new entry in your PATH environment variable and some configuration changes to make Python look only in a specific place for packages.\nThere's no real downside to using a virtualenv beyond typing one extra command to activate it.","Q_Score":1,"Tags":"python,django,virtualenv","A_Id":48594571,"CreationDate":"2018-02-03T05:54:00.000","Title":"Is pyenv or virtualenv essential for Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"For the first time, I made an environment for Django with virtualbox and vagrant (CentOS 7).  \nBut every tutorial I saw says I need to use pyenv or virtualenv. I think they are used to make a virtual environment for Django. But I don't know why I need to use pyenv or virtualenv. (For example, Cakephp3 doesn't need packages like pyenv or virtualenv.)  \nAnd I was using virtualbox and vagrant, which are already virtual environment, so I think I was making virtual environment inside another virtual environment. I am not sure if this is meaningful. Maybe pyenv and virtualenv are not necessary if I am using virtual environment like virtualbox or vmware?\nAre they essential for Django? When I deploy Django in actual server, do I still need to use pyenv or virtualenv?","AnswerCount":4,"Available Count":4,"Score":0.049958375,"is_accepted":false,"ViewCount":717,"Q_Id":48594395,"Users Score":1,"Answer":"If you ever need to create other projects with different versions of python and with different versions of dependencies in the same virtualbox in future, then pyenv and virtualenv will save you from countless headaches.","Q_Score":1,"Tags":"python,django,virtualenv","A_Id":58344556,"CreationDate":"2018-02-03T05:54:00.000","Title":"Is pyenv or virtualenv essential for Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have the bulk of my web application in React (front-end) and Node (server), and am trying to use Python for certain computations. My intent is to send data from my Node application to a Python web service in JSON format, do the calculations in my Python web service, and send the data back to my Node application. \nFlask looks like a good option, but I do not intend to have any front-end usage for my Python web service. Would appreciate any thoughts on how to do this.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":415,"Q_Id":48600583,"Users Score":0,"Answer":"In terms of thoughts:\n1) You can build a REST interface to your python code using Flask. Make REST calls from your nodejs. \n2) You have to decide if your client will wait synchronously for the result. If it takes a relatively long time you can use a web hook as a callback for the result.","Q_Score":0,"Tags":"python,node.js,rest,api,web-services","A_Id":48600936,"CreationDate":"2018-02-03T18:27:00.000","Title":"Python web service with React\/Node Application","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to decide if I should use gevent or threading to implement concurrency for web scraping in python.\nMy program should be able to support a large (~1000) number of concurrent workers. Most of the time, the workers will be waiting for requests to come back.\nSome guiding questions:\nWhat exactly is the difference between a thread and a greenlet? What is the max number of threads \\ greenlets I should create in a single process (with regard to the spec of the server)?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1130,"Q_Id":48608845,"Users Score":0,"Answer":"The python thread is the OS thread which controlled by the OS which means it's a lot heavier since it needs context switch, but the green thread is lightweight and since it's in userspace the OS does not create or manage them.\nI think you can use gevent, Gevent = eventloop(libev) + coroutine(greenlet) + monkey patch, Gevent give you threads but without using threads with that you can write normal code but have async IO.\nMake sure you don't have CPU bound stuff in your code.","Q_Score":1,"Tags":"python,multithreading,concurrency,python-multithreading,gevent","A_Id":57702150,"CreationDate":"2018-02-04T14:02:00.000","Title":"Python Threading vs Gevent for High Volume Web Scraping","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I\u2019ve started working a lot with Flask SocketIO in Python with Eventlet and are looking for a solution to handle concurrent requests\/threading. I\u2019ve seen that it is possible with gevent, but how can I do it if I use eventlet?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2111,"Q_Id":48611425,"Users Score":5,"Answer":"The eventlet web server supports concurrency through greenlets, same as gevent. No need for you to do anything, concurrency is always enabled.","Q_Score":2,"Tags":"python,socket.io,webserver,flask-socketio,eventlet","A_Id":48616158,"CreationDate":"2018-02-04T18:10:00.000","Title":"Handle concurrent requests or threading Flask SocketIO with eventlet","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I would like to have you sharing the template in Dash python where it generate a scatter charter with the help of plot.ly stunning graphics.\nI am unable to make my Dash framework running but I do the same flawlessly in Jupyter Notebook. Just was wondering if I could run it on Dash.\nYour help is much appreciated.\nRegards.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":458,"Q_Id":48612105,"Users Score":0,"Answer":"I have solved it.\nIt was due to miscoding. The code was not in the right place.\nThanks.","Q_Score":2,"Tags":"python,plotly-dash","A_Id":48779917,"CreationDate":"2018-02-04T19:22:00.000","Title":"How to render a plot.ly Jupyter Notebook file into Dash python Dashboard","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a website whose code contains a lot of computation (mostly in Python). Is there a way to perform those computations on Google App Engine every time and just return the results to the user?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":38,"Q_Id":48612807,"Users Score":1,"Answer":"Yes, that's exactly what App Engine is designed for.","Q_Score":0,"Tags":"python,google-app-engine,google-compute-engine","A_Id":48617341,"CreationDate":"2018-02-04T20:40:00.000","Title":"Linking a website to Google App Engine","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm loading in background task (using ajax and Python api) a possibly large table by blocks of 25 rows.  I'm using a bootstrap table sorter.  I would like to be able to initialise table sorter after first block loaded and then refresh it after each block.\nIf I simply initialise my table sorter on the first block loaded, filter and sort, it fails when a subsequent block is loaded.\nIs there a way to refresh\/reload table sorter as soon as rows are added?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":31,"Q_Id":48622996,"Users Score":0,"Answer":"Thanks,\nI finaly did it using following syntax:\n $(\"#my-table\").trigger(\"update\", [resort, dummyCallbackFunction]);\nWhere resort is a boolean set to True or False and dummyCallFunction a function doing nothing in my case.\nIt works perfectly.","Q_Score":0,"Tags":"python,ajax,bootstrap-4,reload,tablesorter","A_Id":48707139,"CreationDate":"2018-02-05T12:49:00.000","Title":"How to refresh tablesorter when rows are added?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In Sale Module, We Create Sale Order and Quotation Reports. Both Reports are displayed in print button. We need to separate that reports based on Quotation and Sale Order. \nWe Using same Model name for sale and Quotation but write different view file.","AnswerCount":3,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":355,"Q_Id":48637661,"Users Score":0,"Answer":"You can not apply a domain over that menu, you should remove this menus and use\/create buttons to print Quotation or Order, you can apply domain over a button.","Q_Score":0,"Tags":"python,xml,odoo,odoo-10,odoo-view","A_Id":48669234,"CreationDate":"2018-02-06T07:30:00.000","Title":"How to separate Print report in Odoo 10?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In Sale Module, We Create Sale Order and Quotation Reports. Both Reports are displayed in print button. We need to separate that reports based on Quotation and Sale Order. \nWe Using same Model name for sale and Quotation but write different view file.","AnswerCount":3,"Available Count":3,"Score":0.0665680765,"is_accepted":false,"ViewCount":355,"Q_Id":48637661,"Users Score":1,"Answer":"You try this code for create two different button with same code but change string and Id.\n<report \n        id=\"report_sale_order\"\n        string=\"Quotation\"\n        model=\"sale.order\" \n        report_type=\"qweb-pdf\"\n        file=\"sale.report_saleorder\" \n        name=\"sale.report_saleorder\" \n    \/>","Q_Score":0,"Tags":"python,xml,odoo,odoo-10,odoo-view","A_Id":48859784,"CreationDate":"2018-02-06T07:30:00.000","Title":"How to separate Print report in Odoo 10?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In Sale Module, We Create Sale Order and Quotation Reports. Both Reports are displayed in print button. We need to separate that reports based on Quotation and Sale Order. \nWe Using same Model name for sale and Quotation but write different view file.","AnswerCount":3,"Available Count":3,"Score":0.0665680765,"is_accepted":false,"ViewCount":355,"Q_Id":48637661,"Users Score":1,"Answer":"In sale order and quotation reports, If you conform the quotation it will print the sale order report and does not print quotation report.So it's separated from each other.","Q_Score":0,"Tags":"python,xml,odoo,odoo-10,odoo-view","A_Id":48960462,"CreationDate":"2018-02-06T07:30:00.000","Title":"How to separate Print report in Odoo 10?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm having a little trouble figuring out if I should have an API for admins and for users splitted. So:\nAdmins should login using \/admin\/login with a POST request, and users just \/login.\nAdmins should access\/edit\/etc resources on \/admin\/resourceName and users just \/resourceName.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":40,"Q_Id":48646826,"Users Score":1,"Answer":"You should only have one endpoint, not one for each type of user. What if you have moderators? Will you also create a \/mods\/login ?\nWhat each user should and shouldn't have access to should be sorted out with permissions.","Q_Score":1,"Tags":"python,rest,falconframework","A_Id":48646870,"CreationDate":"2018-02-06T15:46:00.000","Title":"Should I make an API for users and an API for admins?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it okay to edit the existing django-oscar sandbox project as my project or is it better to follow the django-oscar documentation?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":334,"Q_Id":48648358,"Users Score":1,"Answer":"If its for your project, you should follow the docs. But you can always use it for references.","Q_Score":1,"Tags":"python,django,e-commerce,sandbox,django-oscar","A_Id":48667653,"CreationDate":"2018-02-06T17:09:00.000","Title":"Django oscar sandbox editing or django oscar documentaion","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Can anyone explain me the difference between mongoengine and django-mongo-engine and pymongo.\nI am trying to connect to mongodb Database in Django2.0 and python3.6","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":1047,"Q_Id":48648373,"Users Score":1,"Answer":"If you want multiple DBs (in Mongo itself) and need to switch DB for long time, then don't go for mongoengine.\nFor simple interaction mongoengine is a nice option.","Q_Score":0,"Tags":"python,django,mongodb,django-models,python-3.6","A_Id":54759944,"CreationDate":"2018-02-06T17:10:00.000","Title":"Difference between mongoengine and django-mongo-engine and pymongo","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using Robotframework to create test scripts for an application. This application requires many keyboard click\/action combinations that are unavoidable. Right now I am using the PyAutoGui library to simulate these actions and they are working fine, but when I run them through a headless browser on Jenkins, those actions are not registered. \nThe error that I get is \"PyAutoGUI fail-safe triggered from mouse moving to upper-left corner. To disable this fail-safe, set pyautogui.FAILSAFE to False.\"\nHowever, even after changing the Failsafe value to false, the keyboard action is still not captured. \nThe weird thing is that if someone is physically logged into the Jenkins box while the tests are running, the library works perfectly fine, but when running headless, the library breaks. \nIs there another library I can possible use or a possible work around for this situation?\nThanks in advance!","AnswerCount":4,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":3159,"Q_Id":48654727,"Users Score":0,"Answer":"You can workaround this by installing VNC server and run jenkins slave within it. Then browser will start with gui and test will work.","Q_Score":6,"Tags":"python,selenium,jenkins,automation,robotframework","A_Id":48679101,"CreationDate":"2018-02-07T01:45:00.000","Title":"Is it possible use keyboard actions without using the \"PyAutoGUI\" library on jenkins?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using Robotframework to create test scripts for an application. This application requires many keyboard click\/action combinations that are unavoidable. Right now I am using the PyAutoGui library to simulate these actions and they are working fine, but when I run them through a headless browser on Jenkins, those actions are not registered. \nThe error that I get is \"PyAutoGUI fail-safe triggered from mouse moving to upper-left corner. To disable this fail-safe, set pyautogui.FAILSAFE to False.\"\nHowever, even after changing the Failsafe value to false, the keyboard action is still not captured. \nThe weird thing is that if someone is physically logged into the Jenkins box while the tests are running, the library works perfectly fine, but when running headless, the library breaks. \nIs there another library I can possible use or a possible work around for this situation?\nThanks in advance!","AnswerCount":4,"Available Count":2,"Score":0.049958375,"is_accepted":false,"ViewCount":3159,"Q_Id":48654727,"Users Score":1,"Answer":"I have been automating a lot of web applications at work.\nI too started with PyAutoGUI, and had similar problems that you are experiencing going from my laptop to our production server that was running the scripts.\nThe solution I found was Selenium Webdriver.  If what you are testing has an ip address, this may be the solution.  In my opinion it is actually easier than PyAutoGUI.","Q_Score":6,"Tags":"python,selenium,jenkins,automation,robotframework","A_Id":48655247,"CreationDate":"2018-02-07T01:45:00.000","Title":"Is it possible use keyboard actions without using the \"PyAutoGUI\" library on jenkins?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have installed jupyterthemes by pip install --upgrade jupyterthemes under Windows7. But when I type in cmd jt -l,it turns out jt:command not found.\nHow can I solve this problem?","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":599,"Q_Id":48659860,"Users Score":1,"Answer":"You can do: !jt -l\nTo change the theme: !jt -t 'themes name' and reload","Q_Score":1,"Tags":"python-3.x,jupyter-notebook","A_Id":57488016,"CreationDate":"2018-02-07T09:13:00.000","Title":"jupyterthemes jt command not found","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have installed jupyterthemes by pip install --upgrade jupyterthemes under Windows7. But when I type in cmd jt -l,it turns out jt:command not found.\nHow can I solve this problem?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":599,"Q_Id":48659860,"Users Score":0,"Answer":"Exit() python or ipython interpreter and try again e.g on PC using Anaconda prompt: (base) C:\\Users\\YourAccount>jt -l that should work if the themes pack was installed. That is what worked for me when I encountered this issue.","Q_Score":1,"Tags":"python-3.x,jupyter-notebook","A_Id":68090027,"CreationDate":"2018-02-07T09:13:00.000","Title":"jupyterthemes jt command not found","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Am implementing a sign up using python & mysql. \nAm getting the error no module named flask.ext.mysql and research implies that i should install flask first. They say it's very simple, you simply type\npip install flask-mysql\nbut where do i type this? In mysql command line for my database or in the python app?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":702,"Q_Id":48671331,"Users Score":-1,"Answer":"You should be able to type it in the command line for your operating system (ie. CMD\/bash\/terminal) as long as you have pip installed and the executable location is in your PATH.","Q_Score":0,"Tags":"python,mysql,pip,installation","A_Id":48671377,"CreationDate":"2018-02-07T18:56:00.000","Title":"Where do i enter pip install flask-mysql?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it possible to upload a file (say a .pdf or .csv) saved in my hard disk into Jupyter running on VirtualBox?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":277,"Q_Id":48674966,"Users Score":0,"Answer":"Yes, it's possible. \nTo begin with, your host PC mut have a shared folder with your VM (Explained elsewhere).\nA method I do is to\nFirst create a folder myfolder for the (.pdf or .csv) files.\nSecondly, load the folder by: going to the created myfolder  --> right-click on the myfolder --> choose \"Open in Terminal\".\nThirdly, at the terminal it should look like this: myfolder]$. Then I type \"jupyter notebook\" as such: [username@localhost myfolder]$ jupyter notebook and hit ENTER. \nThe folder should be opened and containing my .pdf or .csv files.","Q_Score":0,"Tags":"python,virtual-machine,virtualbox,jupyter","A_Id":51632871,"CreationDate":"2018-02-07T23:20:00.000","Title":"Uploading files to Jupyter running on VM VitualBox","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"i have the below error while running my code on amazon ec2 instance and when trying to import the h5py package i have permission denied error\nImportError: load_weights requires h5py","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":539,"Q_Id":48676037,"Users Score":0,"Answer":"just solve it using sudo pip install hypy.","Q_Score":0,"Tags":"python-3.x,amazon-web-services,h5py","A_Id":48676038,"CreationDate":"2018-02-08T01:26:00.000","Title":"Import error requires h5py","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Django server which responds to a call like this 127.0.0.1:8000\/ao\/. Before adding further applications to the server, I would like to experiment the load balancing which are supported by Django.\nCan anyone please explain how to implement load balancing. I spent sometime in understanding the architecture but was unable to find a solution.\nI work on Windows OS and I am new to servers.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2681,"Q_Id":48677643,"Users Score":0,"Answer":"Load balancing is not anything to do with Django. It is something you implement at a much higher layer, via servers that sit in front of the machines that Django is running on.\nHowever, if you've just started creating your site, it is much too early to start thinking about this.","Q_Score":2,"Tags":"python,django","A_Id":48680841,"CreationDate":"2018-02-08T04:38:00.000","Title":"load balancing in django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new and just start learning flask. In my project, I need all the pages are printed in two languages, say 'LAN_A' and 'LAN_B'. So I need a variant to save it. Now I save it in app.config['language'] = 'LAN_A'\/'LAN_B'. When debugging locally, I browse the page by two devices (thus also two IP). In device1, I change the language then I found all the pages in device2 will also be changed(after the setting in device1). It seems understandable since there is only one main.py is running. \nMy question: Is it because my treatment is inappropriate? or future in the real service, we have some method to let each user run one main.py?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":21,"Q_Id":48682817,"Users Score":1,"Answer":"app.config is global. Don't store user-specific configuration there. Likely you'll want to use a cookie or a URL parameter for the display language.","Q_Score":0,"Tags":"python,variables,flask","A_Id":48683430,"CreationDate":"2018-02-08T10:09:00.000","Title":"Flask variants can be visible by different users?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My server in Python (Tornado) send a csv content on a GET request. \nI want to specify the content type of the response as \"text\/csv\", but when I do this the file is downlaoded when I send the GET request on my browser.\nHow can I specify the header \"Content-type : text\/csv\" without having making it a downlaodable file but just show the content on my browser ?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":50,"Q_Id":48685070,"Users Score":2,"Answer":"The content-type header is what tells the browser how to display a given file. It doesn't know how to display text\/csv, so it has no choice but to treat it as an opaque download. If you want the file to be displayed as plain text, you need to tell the browser that it has content-type text\/plain. \nIf you need to tell other clients that the content type is text\/csv, you need some way to distinguish clients that understand that content type from those that do not. The best way to do this is with the Accept request header. Clients that understand CSV would send Accept: text\/csv in their request, and then the server would respond with content-type text\/plain or text\/csv depending on whether CSV appears in the accept header. \nUsing the Accept header may require modifications to the client, which may or may not be possible for you. If you can't update the clients to send the Accept header, then you'll have to use a hackier workaround. You can either use a different url (add ?type=plain or ?type=csv) or try to detect browsers based on their user agent.","Q_Score":0,"Tags":"python,http,request,tornado","A_Id":48722882,"CreationDate":"2018-02-08T12:04:00.000","Title":"GET response - Do NOT send a downlaodable file","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm a little new to this, and figuring it out as I go. So far so good, however I have having trouble importing a field that has a foreign key. I have about 10,000 rows in a csv file that I want to add to the database. As you can imagine, entering 10,000 items at a time is too labour intensive. When I try for an import I get this error: ValueError: invalid literal for int() with base 10\nThis is because (i think) it is trying to match the related model with the id. However the database is empty, so there is no id, and furthermore, the \"author\" field in my csv (the one with the foreign key) doesn't have an id yet. ( i assume this is created when the record is). Any suggestions?\nSorry in advance for the newbie question.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":423,"Q_Id":48687566,"Users Score":0,"Answer":"You state the the database is blank, if so you're going to have to have at least 1 record in the parent table, where the primary key is defined. After that you can use the parent.primary-key value in your CSV file as a dummy value for your foreign key.  That should at least allow you to populate the table.   Later on, as your parent table grows you're going to have to write some sort of script to add the correct parent.primary-key value to each record in the CSV file and then import it.","Q_Score":0,"Tags":"python,django,csv","A_Id":48688068,"CreationDate":"2018-02-08T14:13:00.000","Title":"CSV import into empty Django database with foreign key field","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have some 1000 html pages. I need to update the names which is present at the footer of every html page. What is the best possible efficient way of updating these html pages instead of editing each name in those html pages one by one.\nEdit: Even if we use some sort of scripts, we have to make changes to every html file. One possible way could be using Editor function. Please share if anybody has any another way of doing it.","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1154,"Q_Id":48697322,"Users Score":0,"Answer":"You can use domdocument and domxpath  to parse the html file(you can use php file_get_contents to read the file )\nit looks like  i can't post links","Q_Score":0,"Tags":"javascript,php,python,html,css","A_Id":60838059,"CreationDate":"2018-02-09T01:15:00.000","Title":"How to update static content in multiple HTML pages","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it possible to trigger a custom device action from another device that is attached to the same account?\ne.g.:\n\nTrigger a custom device action registered to one PI from a second PI that doesn't have any custom device actions.\nTrigger a custom device action registered to one PI from an Android phone attached to the same email address.\n\nBasically I'm trying to figure out if you have to speak directly to the device that has the custom device action.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":95,"Q_Id":48697423,"Users Score":1,"Answer":"Yes, you cannot do remote execution of device actions.","Q_Score":0,"Tags":"python-3.x,raspberry-pi,google-assistant-sdk","A_Id":48698224,"CreationDate":"2018-02-09T01:28:00.000","Title":"Trigger a device action from another device on the same account","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have two instances. One is on the Public Subnet & the other is on the Private subnet of AWS. In the private system, I am performing some computation. And the public system is acting as the API endpoint.\nMy total flow idea is like this: When some request comes to the public server, the parameters should be forwarded to the private system, the computation will be done there and the result will be sent back to the public and from there the result will be fed back to the user.\nIn the private system, some python code is running. I did setup Apache-Flask in the private system. So the idea is when some requests are coming, from the public server the parameters will be extracted and another HTTP request will be fired to the private system. Computation will be done there and the response will return which will return to the client system.\nI have two question, Is this a good approach? Any better way to implement the total scenario?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":59,"Q_Id":48702061,"Users Score":0,"Answer":"This is a commonly used pattern when separating Web Servers and App Servers in traditional Web Application setup, keeping the Web Servers in public subnets (Or keeping internet accessible) and the business rules kept in App Servers in the private network.\nHowever, it also depends on the complexity of the system to justify the separation having multiple servers. One of the advantages of this approach is you can scale these servers separately.","Q_Score":0,"Tags":"python,amazon-web-services,http,server","A_Id":48702358,"CreationDate":"2018-02-09T08:58:00.000","Title":"Best way for communicating between two servers","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a wav file (test.wav)\nI am trying to apply tags to it:\n\ntitle\nartist\nalbum\nyear \/ release date\n\nI have had no success with pydub or eyed3\nIs there a way I can do this?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":304,"Q_Id":48712383,"Users Score":0,"Answer":"I think that it is hard or even impossible to add tags to WAV so I will convert the wav files to mp3 files using ffmpy and then use eyed3 to add the tags.","Q_Score":2,"Tags":"python,audio,wav","A_Id":50443585,"CreationDate":"2018-02-09T18:56:00.000","Title":"Applying tags to a wav file in Python 2.7 on Windows","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"On my Fedora 25 I have configured the virtual environment with python 3.5\nand after upgrading the system to Fedora 27 I cannot longer launch django app withing the virtual env (python manage.py runserver) neither check the version of the python:\nerror while loading shared libraries: libpython3.5m.so.1.0: cannot open shared object file: No such file or directory\nCould you please advice what to do next? I'm not advanced user in terms of python configuration. Shall I reinstall python 3.5 or try to set up virtual environment once again?\nAny help greatly appreciated.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":4951,"Q_Id":48730129,"Users Score":0,"Answer":"Thank you phd and Kevin L.! \nThe virtualenv -p python3 my_env_name solved the issue. \nThen it was important to restore dependencies via pip module \nAnyone doing the migration (to newer linux or another pc)  I also recommend to dump the dependencies with  pip freeze > requirements.txt.","Q_Score":3,"Tags":"python,django,virtualenv","A_Id":48733188,"CreationDate":"2018-02-11T09:36:00.000","Title":"Python error while loading shared libraries: libpython3.5m.so.1.0: cannot open shared object file: No such file or directory","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am currently developing my first more complex Web Application and want to ask for directions from more experienced Developers.\nFirst I want to explain the most important requirements.\nI want to develop a Web App (no mobile apps or desktop apps) and want to use as much django as possible. Because I am comfortable with the ecosystem right now and don't have that much time to learn something new that is too complex. I am inexperienced in the Javascript World, but I am able to do a little bit of jQuery.\nThe idea is to have one database and many different Frontends that are branded differently and have different users and administrators. So my current approach is to develop a Backend with Django and use Django Rest Framework to give the specific data to the Frontends via REST. Because I have not that much time to learn a Frontend-Framework I wanted to use another Django instance to use as a Frontend, as I really like the Django Template language. This would mean one Django instance one Frontend, where there would be mainly TemplateViews. The Frontends will be served on different subdomains, while the backend exposes the API Endpoints on the top level domain.\nIt is not necessary to have a Single Page App. A Normal Website with mainly the normal request\/response-cycle is fine.\nDo you think this is a possible approach to do things? I am currently thinking about how to use the data in the frontend sites in the best way. As I am familiar with the Django template language I thought about writing a middleware that asks about the user details in every request cycle from the backend. The thought is to use a request.user as normally as possible while getting the data from the backend.\nOr is ist better to ask these details via jQuery and Ajax Calls and don't use the django template language very much?\nMaybe there is also a way to make different Frontends for the same database without using REST?\nOr what would you think about using a database with each frontend, which changes everytime I make a change in the main database in the backend? Although I don't really like this approach due to the possibility of differences in data if I make a mistake.\nHopefully this is not to confusing for you. If there are questions I will answer them happily. Maybe I am also totally on the wrong track. Please don't hesitate to point that out, too.\nI thank you very much in advance for your guiding and wish you a nice day.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":548,"Q_Id":48730694,"Users Score":0,"Answer":"as per my experience and knowledge, you are almost going towards correct direction.\nmy recommendation is for making backend rest api Django and django rest framework is the best option however for consuming those api you can look for the angular or react both works very well in terms of consuming API.","Q_Score":0,"Tags":"python,jquery,django,django-rest-framework","A_Id":48730768,"CreationDate":"2018-02-11T10:49:00.000","Title":"Design Decision Django Rest Framework - Django as Frontend","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to build a Marshmallow schema based on a model, but with one additional field. While this seemed to work by declaring the special field by itself and then setting meta.model to my assigned model, I fail to find a solution so that the additional field gets validated (it is marked as required), but does not turn up in the resulting, deserialized object.\nI tried setting it as excluded and dump_only, but to no avail, either the validation does not take place, or the deserialized object also contains the additional field (which then clashes with my ORM).","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":507,"Q_Id":48732470,"Users Score":1,"Answer":"For now I solved it by subclassing my model schema, adding the additional field there, and then - before loading my data through the model schema - validating it through the subclassed schema.\nIf there is a more elegant solution I'd still love to hear it.","Q_Score":1,"Tags":"python,json,validation,marshmallow","A_Id":48732969,"CreationDate":"2018-02-11T14:20:00.000","Title":"Validate field in Marshmallow but don't deserialize it","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I got a task to make exports of several big tables in DB asynchronous because right now the amount of records is so big that it takes too much time. So I've successfully moved the code of exporting to the Celery task. It exports and saves the file in a folder on a server. But I am not able to get from the task the whole filename, which I could pass to the rest of code and therefore download it after completing the export process because the only thing Celery task can return is only the state of the result of performing the task (done or not yet or failed).  I am using Django\/Python + Celery + Redis. Thank you for any advice, it already borders me for several days.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":379,"Q_Id":48749538,"Users Score":1,"Answer":"After helping comment from Danila, I have tried celery.result library, which I didnt know anything about before (surprisingly I also havent found any mention of it before). After importing ResultBase from celery.result, which captures the incoming results from task, I was finally able to get the URL of my generated file and therefore I got what I needed. Thank you","Q_Score":1,"Tags":"python,django,celery,celery-task","A_Id":48769758,"CreationDate":"2018-02-12T15:11:00.000","Title":"What is the best way to get URl of generated file within Celery task","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am using Django 1.11, in one of my models I have added actions when the model is saved.\nHowever I don't want these actions to be done when only a part of the model is saved. \nI know that update_fields=('some_field',) can be used to specify which field must be saved.\nBut, when the object has been fetched in the database using the methods only() or defer() I don't see any information about the fields updated in the save() method, update_fields is empty.\nThus my question: How can I get the fields saved by Django when only some fields have been fetched ?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":189,"Q_Id":48750404,"Users Score":1,"Answer":"When you use defer or only to load an instance, the get_deferred_fields() method returns a list of field names that have not been loaded; you should be able to use this to work out which ones will be saved.","Q_Score":1,"Tags":"python,django","A_Id":48750740,"CreationDate":"2018-02-12T15:54:00.000","Title":"How to know which field is saved when only() has been used in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am running a Flask application and using uwsgi socket nginx configuration.\nThis may be a stupid question but the issue I am facing is that whenever there is exception raised in Flask code (non handled exception for example 1\/0), my nginx gives 502 instead of 500. I wanted to know if raising the exception is not getting propagated to nginx as 500 from uwsgi unix socket by default or do I need to specify this explicitly? Somewhere I read that for exceptions, Flask doesn't raise 500 error message automatically. Any comments will be helpful. Thanks.","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":1072,"Q_Id":48757083,"Users Score":3,"Answer":"Look at the 502 spec:\n\nThe HyperText Transfer Protocol 502 Bad Gateway server error response\n  code indicates that the server, while acting as a gateway or proxy,\n  received an invalid response from the upstream server.\n\nIf your app responds anything while hitting an exception, it's most likely garbage and nginx raises (correctly) the 502, meaning \"I won't (as opposed to can't) talk to the backend\".\nIf you want 500s, you have to catch any possible underlying exception, wrap it in a valid response and it will be processed by nginx.","Q_Score":0,"Tags":"python,nginx,flask,uwsgi","A_Id":48763573,"CreationDate":"2018-02-12T23:11:00.000","Title":"nginx gives 502 for non handled exception 500 error in flask","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am running a Flask application and using uwsgi socket nginx configuration.\nThis may be a stupid question but the issue I am facing is that whenever there is exception raised in Flask code (non handled exception for example 1\/0), my nginx gives 502 instead of 500. I wanted to know if raising the exception is not getting propagated to nginx as 500 from uwsgi unix socket by default or do I need to specify this explicitly? Somewhere I read that for exceptions, Flask doesn't raise 500 error message automatically. Any comments will be helpful. Thanks.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1072,"Q_Id":48757083,"Users Score":0,"Answer":"Finally I was able to solve this issue. Thanks to @Jeff Storey and @joppich.\nMy proxy server was not able to read the response from by backend server which was causing this issue. I added an interceptor to catch all exceptions and propagate it to NGINX via uwsgi using the nginx proxy_intercept_errors on;. Big thanks Jeff and joppich. Appreciate your help.","Q_Score":0,"Tags":"python,nginx,flask,uwsgi","A_Id":48794623,"CreationDate":"2018-02-12T23:11:00.000","Title":"nginx gives 502 for non handled exception 500 error in flask","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In Python there is a data structure called 'List'. By using 'List' data structure in Python we can append, extend, insert, remove, pop, index, count, sort, reverse.\nIs there any similar data structure in Java where we can get all that function like Python List?","AnswerCount":4,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":11087,"Q_Id":48772017,"Users Score":0,"Answer":"Take a look at Collections in java. There are many lists (ArrayList, LinkedList etc). Choose the best datastructure needed for the requirement and complexity (both space and time).","Q_Score":10,"Tags":"java,python","A_Id":48772107,"CreationDate":"2018-02-13T17:05:00.000","Title":"Java equivalent of Python List","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am developing a desktop application that must send a specified url to a Flask application hosted online, and subsequently receive data from the same Flask app. 2 applications communicating back & forth. I am able to make GET and POST requests to this Flask app, but I am unaware of how to construct specific URL's which include arguments for the Flask app to receive via request.args.get()\nThus far my ability hasn't been entirely erroneous. I can send a request GET \/ HTTP\/1.1\\nHost : \\r\\n which in turn receives something like b'HTTP\/1.0 200 OK\\r\\n'\nWhich is well and good, I got the encoding part down.\nBeyond this I am at a loss as the Flask view function needs to acquire an argument arg from a specific url -\n something like myFlaskApp.com\/viewfunction?h=arg\nWhat would be an at least decent form if not a minimal \/ pragmatic way of practicing this kind of communication? I haven't much code to show for this one; I would like to leave any stratagem open for debate. I hope you can understand. Thank you!\nP.S. +<3 if you also show me how to receive and decode the Flask server's view function return value on my app client. Assumed to be an arbitrary string.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":113,"Q_Id":48795392,"Users Score":0,"Answer":"If your HTTP client is written in python the simplest solution would be to use a higher level HTTP library like requests or urllib2. If you want to get the path mappings against your Flask app views you could print them by introspecting the app object and export them to json or some other format and use them in your client.\nIn your sockets example just use GET \/?arg=value HTTP\/1.1\\nHost : \\r\\n.","Q_Score":0,"Tags":"python,sockets,flask","A_Id":48795531,"CreationDate":"2018-02-14T20:09:00.000","Title":"Python - Using socket to construct URL for external Flask server's view function","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using webots for my project at university. I want my robot to do a specific action for a certain amount of time, but I cannot find a way to do it without blocking the code and the sensors and consequently the whole simulation. I tried both the commands robot.step() and time.sleep() but they both blocck the code and by the time the action is finished the robot does not do anything else even when it is normally supposed to. Specificaly I want the robot to go backwards for a certain ammount of time if the sesnsors at the front and the sides read below a specific distance. Any ideas on how to do it without blocking the code? because if for example I use one of the above commands and there is an object behind the robot the beck sensor will not work because it is blocked and the robot will hit on the object. Thank you.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":529,"Q_Id":48806894,"Users Score":0,"Answer":"I tried robot.step() and it works thank you. I use small increments of time so that the code is not continuously blocing and there is time for my sensors to do the reading.","Q_Score":0,"Tags":"python","A_Id":49682887,"CreationDate":"2018-02-15T12:06:00.000","Title":"Webots programming with Python - blocking code","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is there a way I can access the form that caused a post_save?\nThe use case is that I have a field (a checkbox) that isn't attached to a particular model, but it's an extra field in the form itself.\nI want to know whether the field was checked or unchecked when the form got saved and the model stored, and imho the post_save signal is a good place to put the logic that should process that extra field.\nI'm also open to suggestions where else I could put that piece of code.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":148,"Q_Id":48818101,"Users Score":1,"Answer":"post_save won't know anything about any form that might have caused the model change.\nIf you want to access that checkbox value you need to do it in the form class itself. I would probably override the clean() method of the form, and check for the checkbox value in cleaned_data['checkbox_field'] there, and then do whatever you need to with it.","Q_Score":0,"Tags":"python,django,python-3.x,django-1.10","A_Id":48818718,"CreationDate":"2018-02-15T23:47:00.000","Title":"Access the form that caused a post_save [Django]","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm doing a requests.get(url='url', verify=False), from my django application hosted on an Ubuntu server from AWS, to a url that has a Django Rest Framework. There are no permissions or authentication on the DRF, because I'm the one that made it. I've added headers such as \nheaders = {'User-Agent': 'Mozilla\/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/39.0.2171.95 Safari\/537.36'}, but wasn't able to get any content.\nBUT when I do run .\/manage.py shell and run the exact same command, I get the output that I need!\nEDIT 1:\nSo I've started using subprocess.get_output(\"curl <url> --insecure\", shell=True) and it works, but I know this is not a very \"nice\" way to do things.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":48,"Q_Id":48833111,"Users Score":0,"Answer":"I know what the problem was.\nMy application when it was being deployed was single threaded, not multithreaded.\nI changed my worker number and that fixed everything.","Q_Score":0,"Tags":"python,django,python-requests","A_Id":49059369,"CreationDate":"2018-02-16T18:48:00.000","Title":"Why do I not get any content with python requests get, but still a 200 response?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have developed a rest API using Flask to expose a Python Keras Deep Learning model (CNN for text classification). I have a very simple script that loads the model into memory and outputs class probabilities for a given text input. The API works perfectly locally.\nHowever, when I git push heroku master, I get Compiled slug size: 588.2M is too large (max is 500M). The model is 83MB in size, which is quite small for a Deep Learning model. Notable dependencies include Keras and its tensorflow backend. \nI know that you can use GBs of RAM and disk space on Heroku. But the bottleneck seems to be the slug size. Is there a way to circumvent this? Or is Heroku just not the right tool for deploying Deep Learning models?","AnswerCount":7,"Available Count":1,"Score":0.0855049882,"is_accepted":false,"ViewCount":7474,"Q_Id":48840025,"Users Score":3,"Answer":"A lot of these answers are great for reducing slug size but if anyone still has problems with deploying a deep learning model to heroku it is important to note that for whatever reason tensorflow 2.0 is ~500MB whereas earlier versions are much smaller. Using an earlier version of tensorflow can greatly reduce your slug size.","Q_Score":10,"Tags":"python,tensorflow,heroku,keras,deep-learning","A_Id":61806979,"CreationDate":"2018-02-17T09:52:00.000","Title":"Heroku: deploying Deep Learning model","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Good day!\nI'm pretty new to python\/scrapy as in never tried it.\nI've been able to work through a lot of the issues I've come across but I'm stuck trying to resolve \"Running setup.py bdist_wheel for lxml ... error\"\nI can't seem to get past it. I've tried to \"pip3 install lxml\" but that fails.\nI could past the whole terminal text but that is almost 500 lines. What would be helpful to provide enough info to resolve.\nOS 10.11.6 \nAny help would be great!\nI'm anxious to try out scrapy!\nNick\nMaybe I should enter my response here! :)\nI have been able to install other packages. I've started over a couple of times so I'm working in a \"fresh\" virtualenv","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":188,"Q_Id":48847375,"Users Score":0,"Answer":"from user stanac, async and await are keywords in python 3.7. so even after I was able to install scrapy successfully, i couldn't run bench or shell (testing install) without throwing errors. installed a virtualenv targeting 2.7 and installed and ran bench\/shell with no issues.","Q_Score":1,"Tags":"python,scrapy,virtualenv","A_Id":48876629,"CreationDate":"2018-02-18T00:45:00.000","Title":"Scrapy install in virtualenv - cant resolve issue. looks related to lxml?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I made server using python on laptop. And I made client using Java on samelaptop. They were connected, and They were communicated.\nBut when I made client using Java on another laptop, client didn't find server \nWhat is wrong?? and What could I do??","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":27,"Q_Id":48852421,"Users Score":0,"Answer":"On the laptop running the server:\nThe client can access using localhost:<port> or 0.0.0.0:<port> \nConnecting from another laptop (same network):\nYou have to connect to: <pc-server-local-ip>:<port> \nTo get <pc-server-local-ip, using the laptop running your server:\n- Windows : type ipconfig in console, value next to IPV4\n- Linux \/ Mac : type ifconfig in console, value next to inet","Q_Score":0,"Tags":"java,python,server,client","A_Id":48852566,"CreationDate":"2018-02-18T13:52:00.000","Title":"python server and java client(another PC) Error","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was wondering if it was possible to have a web service running on Flask to execute a function at a certain time every day.\nI'm making a Slack bot with Flask and Python, and I want the bot to send out a reminder every day at 6:00 to a channel.\nIs it possible to keep track of the current time continuously, and only perform an action once the current time equals a set time?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":479,"Q_Id":48854351,"Users Score":1,"Answer":"You could, but that is not a good way of doing it. Your operating system almost certainly has this functionality built-in; on unix-like systems for example you would use cron.","Q_Score":0,"Tags":"python,flask,slack,slack-api","A_Id":48854371,"CreationDate":"2018-02-18T17:09:00.000","Title":"How to execute a function at certain time and day with Flask and Python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it possible in django to iterate all current sessions? I want to implement a calendar where it is impossible to book a timeslot that someone else is booking. I Keep a list of timeslots id's in the session before the user proceeds to checkout.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":315,"Q_Id":48855204,"Users Score":1,"Answer":"AFAIK you can't. You need to implement some kind of time-limited reservation. Temporarily book a timeslot for user on his second booking step - right after he picks his date. Then if he finalizes the process make the book permanent or delete reservation (and make the date available again) after few minutes.\nYou need to do this in this way, otherwise you will end up with lots of dead dates created by users which didn't finish the booking process.","Q_Score":0,"Tags":"python,django,session","A_Id":48855694,"CreationDate":"2018-02-18T18:34:00.000","Title":"Iterate over all current sessions in django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"For the last two days I am struggling with the following question:\nGiven an absolute path (string) to a directory (inside my file system or the server, it doesn't matter), determine if this dir contains a valid Django project.\nFirst, I thought of looking for the manage.py underneath, but what if some user omit or rename this file?\nSecondly, I thought of locating the settings module but I want the project root, what if the settings is 2 or more levels deep?\nThird, I thought of locating the (standard) BASE_DIR name inside settings, but what if the user has not defined it or renamed it?\nIs there a way to properly identify a directory as a valid Django project? Am I missing something?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":119,"Q_Id":48866415,"Users Score":0,"Answer":"One way you can try is searching\/reading the.py files in the directory and match with regex a pattern describing \nthe distinctive django main function and package names. \nMight be lucrative, but... eh","Q_Score":5,"Tags":"python,django","A_Id":48867156,"CreationDate":"2018-02-19T12:37:00.000","Title":"Ensure that a path to a dir is a Django project","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"we are trying to pass long value to the WLDFAccessRuntime (mbean of weblogic), attribute is EarliestAvailableTimestamp & LatestAvailableTimestamp, which expects 'L' at the end.\nEarliestAvailableTimestamp (Default Value)\ncmo.getEarliestAvailableTimestamp()\n1509097885002L\nBut we are trying to change the value via wlst script\na=1234\nb=long(a) -- this value is passed to EarliestAvailableTimestamp()\nThough its a long, but its not giving L at the end, so EarliestAvailableTimestamp() is not accepting the value.\nEg:\ns=1519056698455\ne=1519057598000\nscript value:\ncursorname = cmo.openCursor(long(s),long(e),\"\")\nprint cursorname\nCUSTOM\/com.bea.wli.monitoring.sla.alertIterator-25--9159200561733388375\nMaually Entered value:\ncursorname = cmo.openCursor(1519056698455L,1519057598000L,\"\")\nprint cursorname\nCUSTOM\/com.bea.wli.monitoring.sla.alertIterator-26-6422683192499293139\nBoth the cursorname value should be same.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":121,"Q_Id":48870318,"Users Score":0,"Answer":"Issue has been resolved, wlst was bypassing the python libraries, which caused the issue.\nimported libraries with namespace fixed the issue.","Q_Score":0,"Tags":"python,shell,wlst","A_Id":48902430,"CreationDate":"2018-02-19T16:29:00.000","Title":"Need to pass long value to a variable to WLST, which expects L at end","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I developed a flask app running on virtualenv, how do I deploy it into production? I have a Red Hat Enterprise Linux Server release 5.6, cannot use docker.\nThe server has cgi and wsgi setup. Python 2.7.\nI know using the pip install -r requirements.txt, but how do I get the virtualenv to persist on production once my session is terminated?\nI am using source x..\/venv\/bin\/activate\nexport FLASK_APP=myapp.py\nflask run --host=0.0.0.0 --port=8082\nand this will allow me to access myurl:8082\nHow do I present a way for other users once I terminate session?","AnswerCount":4,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2680,"Q_Id":48876711,"Users Score":0,"Answer":"You may want to look at using a  requirements.txt file in Python.  Using $ pip freeze > requirements.txt can build that file with what pip has installed in your virtualenv.","Q_Score":0,"Tags":"python,flask,virtualenv","A_Id":48877242,"CreationDate":"2018-02-20T01:44:00.000","Title":"How to deploy flask virtualenv into production","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I really am at a loss here. I am using Pycharm 5.0.4 and running a virtual env with Python3 and Django 2.0.1. \nI am trying to get my database up and running for my project, but no matter what I do I cannot seem to get anything to show up in the database tool window drop down in Pycharm. I have 'ENGINE': 'django.db.backends.sqlite3' set in my settings.py, and in Pycharm i am going to:\n Create New -> Data Source -> SQlite(Xerial). \nI then makemigrations and migrate but nothing shows up in the database. I can even go to the project website and succesfully add\/create models in the admin site. But I cannot figure out where they are or see them...   \nIt was working at one point but I deleted my database because I was getting some errors and now I am trying to recreate it.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":331,"Q_Id":48877570,"Users Score":0,"Answer":"you do not need to go to Create New -> Data Source -> SQlite(Xerial). \nif your setting.py database config is as is ('ENGINE': 'django.db.backends.sqlite3')  the database is autogenerated when you run makemigrations  then migrate.\nto recreate the database (you said you deleted):\n\nremove previous migrations (delete all files in your app's migration folder except the init.py)\nCtrl+Alt+R (or tools -> run manage.py)\nthen in the manage.py terminal run makemigrations andmigrate`\n\na new database will be created and migrations applied......... you dont have to worry about seeing the entries in the database directly.\nIf you're able to create superuser and login to the admin site and manipulate model data, then you're up and running","Q_Score":0,"Tags":"python,django,pycharm","A_Id":48877702,"CreationDate":"2018-02-20T03:50:00.000","Title":"unable to see my anything in database pycharm","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We have an ERPNext open software which is working fine on AWS Large Instance of 500 GB HDD. Recently, as it is an excess configuration for our usage, we downgraded to Medium Instance and 20 GB HDD. Also, we have changed the OS, from Ubuntu 14.x to 16.x. So the python version also got changed(i.e., Python 2.7.6 to Python 2.7.12). From then, we are facing a frequent disconnecting issue i.e., it shows site not found when we access the site. We are using Elastic IP. We upgraded to a Large instance and the same issue still continuous. So it is not an instance issue. \nI feel this is weird because, when few people at my office, says it is not working, I can access the site from my home at the same point of the time. But, they are able to access other sites, except this ERP site.\nI'm not getting what caused the problem. Can anyone help me with this? Is this a problem with AWS or IP issues or Ubuntu 16.04 not supporting ERPNext or Python Version? I've left with no clue. Any help is greatly appreciated. Thanks.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":77,"Q_Id":48890843,"Users Score":0,"Answer":"This is due to fail2ban which is treating no.of requests from a LAN connection as bruteforce attack and hence blocking the further requests. After purging fail2ban everything worked fine.","Q_Score":0,"Tags":"python,amazon-web-services,erpnext","A_Id":48911671,"CreationDate":"2018-02-20T17:20:00.000","Title":"ERPNext on AWS server disconnectng frequently","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"What is the current best practice and method of loading a webpage (that has 10 - 15 seconds worth of server side script). \n\nUser clicks a link > server side runs > html page is returned (blank\npage for 10 - 15 seconds).\nUser clicks a link > html page is immediately returned (with progress\nbar) > AJAX post request to the server side > complete script > return result to\nhtml.\nOther options (threading?)\n\nI am running Google App Engine (Python) Standard Environment.","AnswerCount":2,"Available Count":2,"Score":0.1973753202,"is_accepted":false,"ViewCount":73,"Q_Id":48896407,"Users Score":2,"Answer":"Best Practice would be for the the script to not take 10-15 seconds. \nWhat is your script doing? Is it generating something that you can pre-compute and cache or save in Google Cloud Storage?\nIf you're daisy-chaining datastore queries together, is there something you can do to make them happen async in tandem?\nIf it really has to take 10-15 seconds, then I'd say option 2 is must:\n\nUser clicks a link > html page is immediately returned (with progress bar) > AJAX post request to the server side > complete script > return result to html.","Q_Score":3,"Tags":"javascript,python,html,ajax,google-app-engine","A_Id":48897992,"CreationDate":"2018-02-21T00:27:00.000","Title":"Best practice for loading webpage with long server side script","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"What is the current best practice and method of loading a webpage (that has 10 - 15 seconds worth of server side script). \n\nUser clicks a link > server side runs > html page is returned (blank\npage for 10 - 15 seconds).\nUser clicks a link > html page is immediately returned (with progress\nbar) > AJAX post request to the server side > complete script > return result to\nhtml.\nOther options (threading?)\n\nI am running Google App Engine (Python) Standard Environment.","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":73,"Q_Id":48896407,"Users Score":1,"Answer":"The way we're doing it is using the Ajax approach (the second one) which is what everyone else does.\nYou can use Task Queues to run your scripts asynchronously and return the result to front end using FCM (Firebase Cloud Messaging).\nYou should also try to break the script into multiple task queues to make it run faster.","Q_Score":3,"Tags":"javascript,python,html,ajax,google-app-engine","A_Id":48899196,"CreationDate":"2018-02-21T00:27:00.000","Title":"Best practice for loading webpage with long server side script","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have followed all the steps shared in all stackoverflow and other questions out there to install gettext for windows (10), but still, I get the error: \"Can't find msguniq, make sure you have gettext tools installed\" when using internationalization in django. I have tried to download the files directly and added them to the PATH, and even an installer that had already compiled everything and added to the path automatically, but it still doesn't work, and I don't know what else to do... Help please!\nThank you for your time.","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":4679,"Q_Id":48911270,"Users Score":0,"Answer":"In windows you just need to download :\ngettext-tools-xx.zip\ngettext-runtime-xx.zip\nfrom here: enter link description here\nand then you need to unzip them and copy all in bin folder of both files into C:\\Program Files\\gettext-utils\\bin and then you need to go to control panel-> system -> advanced -> environment variables and add this path:C:\\Program Files\\gettext-utils\\bin to path variables. Note:\nxx is the version you want to download if you download version 18 you will get an error that some dll file is missing, I suggest to download version 17\nthis folder: gettext-utils\\bin does not exist and you need to create it\nrestart your pc before you use gettext","Q_Score":4,"Tags":"python,django,gettext,xgettext","A_Id":53853493,"CreationDate":"2018-02-21T16:50:00.000","Title":"Impossible to install gettext for windows 10","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Right now, I am generating the Allure Report through the terminal by running the command: allure serve {folder that contains the json files}, but with this way the HTML report will only be available to my local because\n\n\nThe json files that generated the report are in my computer\nI ran the command through the terminal (if i kill the terminal, the report is gone) \n\n\nI have tried: Saving the Allure Report as Webpage, Complete, but the results did not reflect to the page, all i was seeing was blank fields. \nSo, what im trying to to do is after I execute the command to generate the report, I want to have an html file of the report that i can store, save to my computer or send through email, so i do not have to execute the command to see the previous reports. (as much as possible into 1 html file)","AnswerCount":6,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":10030,"Q_Id":48914528,"Users Score":5,"Answer":"It's doesn't work because allure report as you seen is not a simple Webpage, you could not save it and send as file to you team. It's a local Jetty server instance, serves generated report and then you can open it in the browser.\nHere for your needs some solutions:\n\nOne server(your local PC, remote or some CI environment), where you can generate report and share this for you team. (server should be running alltime)\nShare allure report folder as files({folder that contains the json files}) to teammates, setup them allure tool, and run command allure server on them local(which one).\n\nHope, it helps.","Q_Score":7,"Tags":"python,automation,frameworks,allure","A_Id":48926889,"CreationDate":"2018-02-21T20:04:00.000","Title":"Is there a way to export Allure Report to a single html file? To share with the team","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Right now, I am generating the Allure Report through the terminal by running the command: allure serve {folder that contains the json files}, but with this way the HTML report will only be available to my local because\n\n\nThe json files that generated the report are in my computer\nI ran the command through the terminal (if i kill the terminal, the report is gone) \n\n\nI have tried: Saving the Allure Report as Webpage, Complete, but the results did not reflect to the page, all i was seeing was blank fields. \nSo, what im trying to to do is after I execute the command to generate the report, I want to have an html file of the report that i can store, save to my computer or send through email, so i do not have to execute the command to see the previous reports. (as much as possible into 1 html file)","AnswerCount":6,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":10030,"Q_Id":48914528,"Users Score":0,"Answer":"Allure report generates html in temp folder after execution and you can upload it to one of the server like netlify and it will generate an url to share.","Q_Score":7,"Tags":"python,automation,frameworks,allure","A_Id":63722118,"CreationDate":"2018-02-21T20:04:00.000","Title":"Is there a way to export Allure Report to a single html file? To share with the team","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created a login page for my application and set the session out for 3 minutes and it is working fine, but the problem is when session out happened the user is still able to do many activities on the current page i.e the logout page do not show until unless user do a page refresh or redirect to the other page.\nSo, how is it possible to do the logout once the session out and user do any of the activity on the current page?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":231,"Q_Id":48921619,"Users Score":0,"Answer":"You can run a javascript setTimeout in the background which will check if user is logged in and after three minutes the browser window will refresh. \nOR (better)\nYou can run this timer server-side and when the client would try to change something, firstly look at the timer or the value where is the time until when is the client logged in and then based on the time perform the action or not. So After you three minutes interval user would be able to see the content but when he would try to change something the backend would reject the request and would require him to log in again.\nIt is much better solution because when it comes to the authentication and similar things, it's better everytime to do them server-side rather than in client browser so that it could not be exploited.\nBUT\nBoth solutions can be applied simultaneously (so that client's browser would reload the window and redirect client to the login page and server would reject the request so that data would not be modified in any way).","Q_Score":0,"Tags":"python,django,django-sessions","A_Id":48923389,"CreationDate":"2018-02-22T07:16:00.000","Title":"Django: detect the mouse click if session out","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"While exporting google spreadsheets from ndb datastore which is hardly of 2 MB size, eats up 128 Mb of run time memory of google app engine? how this is possible? i made a bulk.yaml file also, and i am using gapi calls and defer to export sheet  on google app engine and it is showing error of EXceeding run time memory","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":72,"Q_Id":48924431,"Users Score":2,"Answer":"I've had the same issue with the old Python gdata library when I exported data from Cloud Datastore (NDB lib) to Google Spreadsheets.\nNormally, the issue didn't occur at the first export, but often at some later point. I was looking into the memory usage of instances over time and it was increasing with every export job.\nThe reason was a memory leak in my Python (2.7) code that handled the export. If I remember correctly, I had dicts and lists with plenty of references, some of them potentially in cycles, and the references haven't been explicitly deleted after the job was completed. At least with gdata there was a lot of meta-data in memory for every cell or row the code referenced.\nI don't think this is an issue particular to Google App Engine, Spreadsheets, or the libraries you are using, but how Python deals with garbage collection. If there are references left, they will occupy memory.","Q_Score":2,"Tags":"python,google-app-engine","A_Id":48927054,"CreationDate":"2018-02-22T09:58:00.000","Title":"Exceeding Soft private run time memory error","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I created a python django project use zc.buildout but in vscode pylint cannot recognize the imports in eggs.\nThe error:\n\n[pylint] E0401:Unable to import 'django.test'","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":319,"Q_Id":48945744,"Users Score":0,"Answer":"You can manipulate your PYTHONPATH environment variable with a .env file and that will be used when running Pylint.","Q_Score":0,"Tags":"python,visual-studio-code,pylint,buildout","A_Id":49018806,"CreationDate":"2018-02-23T10:30:00.000","Title":"How can i correct linting python import when use zc.buildout in vscode","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using AWS S3 to serve my static files - however I've just found out you can't edit them directly from S3, which kind of makes it pointless as I will be continuously changing things on my website. So - is the conventional way to make the changes then re-upload the file? Or do most developers store their base.css file in their repository so it's easier to change? \nBecause I'm using Django for my project so there is only supposed to be one static path (for me that's my S3 bucket) - or is there another content delivery network where I can directly edit the contents of the file on the go which would be better?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":181,"Q_Id":48958005,"Users Score":1,"Answer":"Yes, imo it would be unusual to edit the files of your production website directly from where they are served.\nEdit them locally, check them into your repo and then deploy them to s3 from your repo, perhaps using a tool like Jenkins. If you make a mistake, you have something to roll back to.\nI can't think of any circumstances where editing your files directly in production is a good idea.","Q_Score":1,"Tags":"python,css,django,amazon-web-services,amazon-s3","A_Id":48961939,"CreationDate":"2018-02-24T00:18:00.000","Title":"Edit base.css file from S3 Bucket","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was working with Pyrebase( python library for firebase) and was trying .stream() method but when I saw my firebase dashboard it showed 100 connection limit reached. Is there any way to remove those concurrent connection?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":399,"Q_Id":48973464,"Users Score":0,"Answer":"There is a limit of 100 concurrent connections to the database for Firebase projects that are on the free Spark plan. To raise the limit, upgrade your project to a paid plan.","Q_Score":0,"Tags":"python,rest,firebase,firebase-realtime-database","A_Id":48975506,"CreationDate":"2018-02-25T12:34:00.000","Title":"Firebase connection limit reached","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"As I know, standard new user process registration (Django 2.x) is validate email field only for exists and equals for E-mail Schemas. But users may be write e-mail address like this: JOHN_DOE@MAIL.COM (via Caps Lock) and save it to DB.\n\nIt's would be dangerous, because other user can register account for these e-mail, but in lowercase: john_doe@mail.com or similar, but still that e-mail address!\n\nSo, question now is how to (smart) clean up e-mail address when user is registering?. My ideas:\n\nset email to lowercase before save to DB\ncheck if it exist\/unique in DB (in lowercase view, of course)\n\nI search for best practice for solve this question, btw.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":122,"Q_Id":48985145,"Users Score":0,"Answer":"I would change it to lowercase and then save it because it looks like the least number of operations to be done. Also it should make the shortest code.\nIf you'll decide to check if it's unique in lowercase in DB and then save it you may end up checking DB two times (one when first check, 2nd when saving) if you'll implement it in wrong way.","Q_Score":0,"Tags":"python,django,email,user-registration","A_Id":48985464,"CreationDate":"2018-02-26T09:27:00.000","Title":"Clean email field when new user is registering in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is there any way I can call the \"Zapier trigger\" from my Django Code,\nBasically, I am having a Django form where the user will enter several email-id and when the user clicks on send button then I want to send this form data to Zapier in order to do the next action like writing in google spreadsheet or sending email to everyone.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":838,"Q_Id":48985544,"Users Score":0,"Answer":"David here, from the Zapier Platform team. The easiest way to do this is to have the form submit against your server and use a library like requests to POST to Zapier. This way, you don't have to worry about CORS or revealing the hook url to your users. \nHope that makes sense. \u200bLet me know if you've got any other questions!","Q_Score":0,"Tags":"django,python-3.x,automation,zapier,zapier-cli","A_Id":49000888,"CreationDate":"2018-02-26T09:50:00.000","Title":"Calling Zapier trigger from Django Code","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created a model and migrated in Django, with a unique key constraint for one of the field. Now am trying to remove the unique constraint and generate another migration file with the new change, but it says \"Nothing seems to have changed\".\nI tried with the command \npython manage.py schemamigration  --auto\nPS: I am using OnetoOne relationship for the field.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":2524,"Q_Id":48989366,"Users Score":0,"Answer":"I find the django automigration file generation problematic and incomplete. \nActually I experienced another similar problem with django migration just yesterday. \nHow I solved it:\n\ndelete all migration files from the \/migrations folder\ndo a fresh makemigrations\nrun python manage.py migrate --fake so django does not try to rebuild.. \nHey presto! Working and models updated :D","Q_Score":0,"Tags":"django,python-2.7,django-models","A_Id":48990171,"CreationDate":"2018-02-26T13:11:00.000","Title":"Django: Removing unique constraint and creating migration","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created a model and migrated in Django, with a unique key constraint for one of the field. Now am trying to remove the unique constraint and generate another migration file with the new change, but it says \"Nothing seems to have changed\".\nI tried with the command \npython manage.py schemamigration  --auto\nPS: I am using OnetoOne relationship for the field.","AnswerCount":2,"Available Count":2,"Score":0.2913126125,"is_accepted":false,"ViewCount":2524,"Q_Id":48989366,"Users Score":3,"Answer":"Good question. A one to one relationship implies that one record is associated with another record uniquely. Even though the unique constraint is removed(for one to one field) in the code explicitly, it won't be reflected in your DB. So it won't create any migration file. \nIf you try the same thing for foreign constraint, it will work.","Q_Score":0,"Tags":"django,python-2.7,django-models","A_Id":49001809,"CreationDate":"2018-02-26T13:11:00.000","Title":"Django: Removing unique constraint and creating migration","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My Django App makes SSH connections to n number of machines (using a multithreaded python function). When replica=n is set in kubernetes deployment.yaml file then I want my app to distribute the connections among the n replicas.\nI mean 1 replica should connect to k number machines, another to next k number of machines and so on. When all the replicas are done then it should take the connections in cyclic fashion i.e. next k connections to first machine and another next k to other machine.\nI tried with 2 replicas but all the connections are getting established by both the pods (replicas).\nI want those connections to be distributed among the pods. How can I achieve this?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":32,"Q_Id":49010952,"Users Score":0,"Answer":"If the replica count will not change after launch you can get this info from kube api and then have your pods run from statefulset so they have sequential ids, then use the good old trick of mod N = 0..N-1 to divide work from the list in an even fashion and you should be fine.","Q_Score":0,"Tags":"python,django,multithreading,ssh,kubernetes","A_Id":49011385,"CreationDate":"2018-02-27T14:24:00.000","Title":"Distribute ssh connections made by Django App (multi-threaded python function) among n number of Kubernetes Replicas","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I want to create a minimal webpage where concurrent users can upload a file and I can process the file (which is expected to take some hours) and email back to the user later on.\nSince I am hosting this on AWS, I was thinking of invoking some background process once I receive the file so that even if the user closes the browser window, the processing keeps taking place and I am able to send the results after few hours, all through some pre-written scripts.\nCan you please help me with the logistics of how should I do this?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":912,"Q_Id":49027447,"Users Score":1,"Answer":"Here's how it might look like (hosting-agnostic):\n\nA user uploads a file on the web server\nThe file is saved in a storage that can be accessed later by the background jobs\nSome metadata (location in the storage, user's email etc) about the file is saved in a DB\/message broker\nBackground jobs tracking the DB\/message broker pick up the metadata and start handling the file (this is why it needs to be accessible by it in p.2) and notify the user\n\nMore specifically, in case of python\/django + aws you might use the following stack:\n\nLets assume you're using python + django\nYou can save the uploaded files in a private AWS S3 bucket\nSome meta might be saved in the db or use celery + AWS SQS or AWS SQS directly or bring up something like rabbitmq or redis(+pubsub)\nHave python code handling the job - depends on what your opt for in p.3. The only requirement is that it can pull data from your S3 bucket. After the job is done notify the user via AWS SES\n\nThe simplest single-server setup that doesn't require any intermediate components:\n\nYour python script that simply saves the file in a folder and gives it a name like someuser@yahoo.com-f9619ff-8b86-d011-b42d-00cf4fc964ff\nCron job looking for any files in this folder that would handle found files and notify the user. Notice if you need multiple background jobs running in parallel you'll need to slightly complicate the scheme to avoid race conditions (i.e. rename the file being processed so that only a single job would handle it) \n\nIn a prod app you'll likely need something in between depending on your needs","Q_Score":2,"Tags":"python,bash,concurrency,background-process","A_Id":49088871,"CreationDate":"2018-02-28T10:35:00.000","Title":"Concurrent file upload\/download and running background processes","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I implement a server in python and serve it with gunicorn. \nI have 3 shared sources (urls) with event streams SSE, to be shared to unknown amount of clients.\nIs there any way to enable unlimited processes\/threads in gunicorn to enable sharing to unlimited users, according to requests ?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":185,"Q_Id":49028537,"Users Score":0,"Answer":"I found out that this command does the job:\nsudo gunicorn --bind 0.0.0.0:80 MyApp:app --worker-class gevent --timeout 90\nIt can serve me as much as possible now.","Q_Score":0,"Tags":"python,multithreading,iot","A_Id":49919399,"CreationDate":"2018-02-28T11:29:00.000","Title":"Is there any way to enable unlimited processes\/threads in gunicorn to enable sharing to unlimited users?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've gone through the docs of Provider and Resource of Django OAuth Toolkit, but all I'm able to find is how to 'authenticate' a user, not how to register a user.\nI'm able to set up everything on my machine, but not sure how to register a user using username & password. I know I'm missing something very subtle. How do I exactly register a user and get an access token in return to talk to my resource servers.\nOR \nIs it like that I've to first register the user using normal Django mechanism and then get the token of the same?","AnswerCount":4,"Available Count":2,"Score":1.0,"is_accepted":false,"ViewCount":6515,"Q_Id":49031954,"Users Score":6,"Answer":"You have to create the user using normal Django mechanism (For example, you can add new users from admin or from django shell). However, to get access token, OAuth consumer should send a request to OAuth server where user will authorize it, once the server validates the authorization, it will return the access token.","Q_Score":11,"Tags":"python,django,django-rest-framework,django-registration,django-oauth","A_Id":49129766,"CreationDate":"2018-02-28T14:31:00.000","Title":"Django OAuth Toolkit - Register a user","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've gone through the docs of Provider and Resource of Django OAuth Toolkit, but all I'm able to find is how to 'authenticate' a user, not how to register a user.\nI'm able to set up everything on my machine, but not sure how to register a user using username & password. I know I'm missing something very subtle. How do I exactly register a user and get an access token in return to talk to my resource servers.\nOR \nIs it like that I've to first register the user using normal Django mechanism and then get the token of the same?","AnswerCount":4,"Available Count":2,"Score":0.049958375,"is_accepted":false,"ViewCount":6515,"Q_Id":49031954,"Users Score":1,"Answer":"I'm registering user with regular django mechanism combined with django-oauth-toolkit's application client details (client id and client secret key).\nI have separate UserRegisterApiView which is not restricted with token authentication but it checks for client id and client secret key while making post request to register a new user. In this way we are restricting register url access to only registered OAuth clients.\nHere is the registration workflow:\n\nUser registration request from React\/Angular\/View app with client_id and client_secret.\nDjango will check if client_id and client_secret are valid if not respond 401 unauthorized.\nIf valid and register user data is valid, register the user.\nOn successful response redirect user to login page.","Q_Score":11,"Tags":"python,django,django-rest-framework,django-registration,django-oauth","A_Id":59511833,"CreationDate":"2018-02-28T14:31:00.000","Title":"Django OAuth Toolkit - Register a user","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've a Python program which just prints \"hello world\". I only want to get that output in a Java program and print that again, i.e. I want to consume output of Python program in a Java program. \nI tried using Runtime.getRuntime().exec(\"helloworld.py\"); but it is giving an exception saying java.lang.IOException : Cannot run program \"helloworld.py\" : CreateProcess error=193, %1 is not a valid Win32 application.\nCan anybody please explain why this exception has occurred and what is solution for it ?\nThanks in advance!","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":202,"Q_Id":49033297,"Users Score":0,"Answer":"Have you tried this,\nRuntime.getRuntime().exec(\"python helloworld.py\");\nPlease try and if it doesn't work leave a comment.","Q_Score":0,"Tags":"java,python,windows","A_Id":49046477,"CreationDate":"2018-02-28T15:39:00.000","Title":"Receive output of python program in java","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"At the moment i am working on an odoo project and i have a kanban view. My question is how do i put a kanban element to the bottom via xml or python. Is there an index for the elements or something like that?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":63,"Q_Id":49046224,"Users Score":0,"Answer":"I solved it myself. I just added _order = 'finished asc' to the class. finished is a record of type Boolean and tells me if the Task is finished or not.","Q_Score":0,"Tags":"python-2.7,odoo-8,odoo","A_Id":49046718,"CreationDate":"2018-03-01T09:10:00.000","Title":"Is there a way to put a kanban element to the bottom in odoo","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm starting using Allure with Python Behave for high-level BDD testing of a medium size C++ ecosystem of services. \nWhat I get is a web page inside Jenkins with pretty and clear reports, thanks to the Allure-Jenkins plugin.\nI have also some unit tests made with TAP, shown in Jenkins with another plugin. \nWhat I would like to get is the integration of the unit test reports inside the same Allure page\nUnfortunately, I was not able to find a C++ Unit Testing Framework directly supporting Allure reports: does any exist?\nOtherwise, I could I get this integration?\nThank you!","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":435,"Q_Id":49051248,"Users Score":1,"Answer":"As far as I know there is no Allure integrations for C++ test frameworks exist yet. But Allure supports JUnit-style XML report format that is de facto standard format for reporting test results. So if your framework can generate results in such format you can generate Allure report for it.","Q_Score":1,"Tags":"c++,jenkins,tap,allure,python-behave","A_Id":49302946,"CreationDate":"2018-03-01T13:56:00.000","Title":"C++ Unit Test Framework with Allure Report","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to develop 404 and 500 error custom templates for my Django project.\nWhen I change DEBUG to False, Django always returns me:\n\nYou're seeing this error because you have DEBUG = True in your Django settings file. Change that to False, and Django will display a standard 404 page.\n\nAfter change ALLOWED_HOSTS to ['.domain.com', 'www.domain.com'] I obtain:\n\nInvalid HTTP_HOST header: 'domain.com'. You may need to add u'domain.com' to ALLOWED_HOSTS.\n\nWhat am I doing wrong? Why Django does not recognize the variable?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":4805,"Q_Id":49059772,"Users Score":1,"Answer":"Find the DJANGO_SETTINGS_MODULE environment variable within your project.\nThe value of it is in python path syntax. Use it to locate the settings file since it is the one getting used by django and make sure that DEBUG = False. Additionally you could add a print statement which gives some visual feedback on server start.\nRestart your development server after you have saved the configuration by executing python manage.py runserver.","Q_Score":0,"Tags":"python,django","A_Id":49060276,"CreationDate":"2018-03-01T22:34:00.000","Title":"Django doesn't recognize DEBUG = False","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I would like to use ActionChains function of Selenium.\nBelow is like my codes. But It does not work when it opens right click menu.\nThe ARROW_DOWN and ENTER are implemented in main window not, right click menu.\nHow can the ARROW_DOWN and ENTER code be implemented in right click menu.\nBrower = webdriver.Chrome()\nactionChain = ActionChains(Browser)\nactionChain.context_click(myselect[0]).send_keys(Keys.ARROW_DOWN).send_keys(Keys.ENTER).perform()","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":913,"Q_Id":49063955,"Users Score":1,"Answer":"Selenium cannot see or interact with native context menus.","Q_Score":0,"Tags":"python-3.x","A_Id":49070495,"CreationDate":"2018-03-02T06:38:00.000","Title":"(Python Selenium with Chrome) How to click in the right click menu list","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm looking for high-level insight here, as someone coming from the PHP ecosystem. What's the common way to deploy updates to a live Flask application thats running on a single server (no load balancing nodes), served by some WSGI like Gunicorn behind Nginx?\nSpecifically, when you pull updates from a git repository or rsync files to the server, I'm assuming this leaves a small window where a request can come through to the application while its files are changing.\nI've mostly deployed Laravel applications for production, so to prevent this is use php artisan down to throw up a maintenance page while files copy, and php artisan up to bring the site back up when its all done.\nWhat's the equivalent with Flask, or is there some other way of handling this (Nginx config)?\nThanks","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":360,"Q_Id":49071433,"Users Score":0,"Answer":"Looks like Docker might be my best bet:\n\nHave Nginx running on the host, and the application running in container A with Gunicorn. Nginx directs traffic to container A.\nBefore starting the file sync, tear down container A and start up container B, which listens on the same local port. Container B can be a maintenance page or a copy of the application.\nStart file sync and wait for it to finish. When done, tear down container B, and start container A again.","Q_Score":4,"Tags":"python,flask,web-deployment","A_Id":49099488,"CreationDate":"2018-03-02T14:43:00.000","Title":"Deploying updates to a Flask application","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I define access rules, that don't permit read. But it remained readable! So object-level permissions don't work for Transient Model?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":561,"Q_Id":49075601,"Users Score":0,"Answer":"in Odoo, ACLs only apply to regular models and don't need to be defined for Abstract or Transient models, if defined, these will be disregarded and a warning message will be triggered into the server log.","Q_Score":0,"Tags":"python-3.x,odoo-11","A_Id":49604167,"CreationDate":"2018-03-02T18:55:00.000","Title":"The access rules for wizards doesn't works in Odoo 11","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I got started using AWS Glue for my data ETL. I've pulled in my data sources into my AWS data catalog, and am about to create a job for the data from one particular Postgres database I have for testing. I have read online that when authoring your own job, you can use a Zeppelin notebook. I haven't used Zeppelin at all, but have used Jupyter notebook heavily as I'm a python developer, and was using it a lot for data analytics, and machine learning self learnings. I haven't been able to find it anywhere online, so my question is this \"Is there a way to use Jupyter notebook in place of a Zeppelin notebook when authoring your own AWS Glue jobs?\"","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":4551,"Q_Id":49090954,"Users Score":1,"Answer":"I think it should be possible, if you can setup a Jupyter notebook locally, and enable SSH tunneling to the AWS Glue.  I do see some reference sites for setting up local Jupyter notebook, enable SSH tunneling, etc, though not AWS Glue specific.","Q_Score":3,"Tags":"python,jupyter,aws-glue","A_Id":49095523,"CreationDate":"2018-03-04T01:12:00.000","Title":"Is it possible to use Jupyter Notebook for AWS Glue instead of Zeppelin","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am using form.py and the user is typing some Email-id, let us say I want to send an email to that particular email and write all that email into google sheet using gspread, I am able to do this in my views.py, but the problem is it's taking a lot of time to write which slow down the rendering process.\nIs there any other way I can use my logic after rendering the template.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":67,"Q_Id":49099308,"Users Score":1,"Answer":"You should use some queuing mechanism like worker and consumer to avoid this problem.\nFor example Celery. \nSteps to do for sending email:\n1. Add email and info to the queue referred as task\n2. Consume the queue. (It runs in the different process may be parallel too)\nYou can also use Channels newly added in Django family of apps.\nThis will provide you an asynchronous way to handle email\/any other deferred task.","Q_Score":0,"Tags":"python,django,django-models,django-templates,django-views","A_Id":49099402,"CreationDate":"2018-03-04T19:10:00.000","Title":"how to call some logic in my views after rendering template in django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it possible to set two different django projects on the same IP address\/server (Linode in this case)? For exmaple, django1_project running on www.example.com and django2_project on django2.example.com. This is preferable, but if this is not possible then how to make two djangos, i.e. one running on www.example.com\/django1 and the second on www.example.com\/django2? Do I need to adapt the settings.py, wsgi.py files or apache files (at \/etc\/apache2\/sites-available) or something else?\nThank you in advance for your help!","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":591,"Q_Id":49112945,"Users Score":0,"Answer":"I'm not familiar with Linode restrictions, but if you have control over your Apache files then you could certainly do it with name-based virtual hosting. Set up two VirtualHost containers with the same IP address and port (and this assumes that both www.example.com and django2.example.com resolve to that IP address) and then differentiate requests using the ServerName setting in the container. In Apache 2.4 name-based virtual hosting is automatic. In Apache 2.2 you need the NameVirtualHost directive.","Q_Score":0,"Tags":"python,django,apache,server,mod-wsgi","A_Id":49113295,"CreationDate":"2018-03-05T14:41:00.000","Title":"Two django project on the same ip address (server)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it possible to set two different django projects on the same IP address\/server (Linode in this case)? For exmaple, django1_project running on www.example.com and django2_project on django2.example.com. This is preferable, but if this is not possible then how to make two djangos, i.e. one running on www.example.com\/django1 and the second on www.example.com\/django2? Do I need to adapt the settings.py, wsgi.py files or apache files (at \/etc\/apache2\/sites-available) or something else?\nThank you in advance for your help!","AnswerCount":2,"Available Count":2,"Score":0.1973753202,"is_accepted":false,"ViewCount":591,"Q_Id":49112945,"Users Score":2,"Answer":"Yes that's possible to host several Python powered sites with Apache + mod_wsgi from one host \/ Apache instance. The only constraint : all apps \/ sites must be powered by the same Python version, though each app may have (or not) its own virtualenv (which is strongly recommended). It is also recommended to use mod_wsgi daemon mode and have each Django site run in separate daemon process group.","Q_Score":0,"Tags":"python,django,apache,server,mod-wsgi","A_Id":49113277,"CreationDate":"2018-03-05T14:41:00.000","Title":"Two django project on the same ip address (server)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Django\/Python application deployed(using gunicorn) with 9 workers with 5 thread each. Let's say if on a given time 45 requests are getting processed, Each thread is writing a lot of logs. How Django avoids writing logs for multiple threads at the same time? And how the file open and close works for each request(does this happen at each request, if yes, any other efficient way of logging)?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":427,"Q_Id":49119297,"Users Score":0,"Answer":"The gunicorn logs will tell you a report on how the workers are being spawned and closed and their socket errors if any. Assuming you are question the django app logs, where you actually decide what you want to log and to which specific file, the workers are allowed to write the logs one-after-the-other i.e also thread safe, will never right over the other.\nBut this has its issues if you are trying to loggerate your logs e.g https:\/\/justinmontgomery.com\/rotating-logs-with-multiple-workers-in-django","Q_Score":0,"Tags":"python,django,django-logging","A_Id":49120892,"CreationDate":"2018-03-05T20:53:00.000","Title":"django\/python logging with gunicorn: how does django logging work with gunicorn","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to translate site using Google Websites Translate and then download it like pdf or jpg. I tried to use wkhtmltopdf, but Google Websites Translate return result in frame. Thus if I take a screenshot (pdf or jpg) of translated page I get empty pdf.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":95,"Q_Id":49125345,"Users Score":0,"Answer":"Converting HTML to PDF may not work here.\nGo for getting snaps of webpages in png\/jpeg format.\ntry FireShot Chrome Extension.\nI am not sure if it'll work, Trying is not bad.","Q_Score":0,"Tags":"python,iframe,wkhtmltopdf,wkhtmltoimage","A_Id":49125491,"CreationDate":"2018-03-06T07:19:00.000","Title":"How to take a screenshot of site which is translated using Google Websites Translate?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am deploying a Python3 app to Google App Engine Flexible Environment. I have all my dependencies listed in the requirements.txt file.\nDuring deployment I received messages indicating the Google libraries have been deployed.\nBut, when the service is started it fails with\nfrom google.cloud import storage  ModuleNotFoundError: No module named 'google' \nThis runs fine locally.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":205,"Q_Id":49136190,"Users Score":0,"Answer":"I needed to include an additional file.\n.\/setup.cfg\n[install]\nprefix=","Q_Score":0,"Tags":"python,python-3.x,google-app-engine,importerror","A_Id":49155149,"CreationDate":"2018-03-06T16:58:00.000","Title":"Google App Engine Flexible Python service fails with \"ModuleNotFoundError: No module named 'google'\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"If App Engine service A and service B both depend on a datastore model, is there an effective way to share that model between both services without either duplicating the model or symlinking the file the model class definition is declared in?\nWould like to hear anyone's experience with this. Maybe storing the shared dependencies in Cloud Storage and pulling the relevant files from there?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":42,"Q_Id":49136417,"Users Score":2,"Answer":"Not really an answer, just some considerations.\nI see a few difficulties to consider if using GCS for storing the shared models:\n\nimporting the models in your app code would be a bit more complex, you'll need to use GCS libraries to read the file(s) for dynamic importing as they would not be available in the local filesystem. As a side effect of the dynamic importing you may loose some development capabilities in your IDE (like auto-completion, object structure verifications, etc) Preserving them might be possible, but probably not trivial.\nsplitting the model definitions across model files (for partial reuse, inheritance and\/or inter-model references for example) would not be a simple task. The point above would need to be addressed in the model files as well, in addition to the application code.\ndeploying the app code on GAE and the models on GCP will always be non-atomic, extra care for coordinating the deployments and probably backward\/forward compatibility would be needed to minimize\/eliminate transient failures.\n\nIMHO the symlinks would be a simpler approach.","Q_Score":3,"Tags":"python,google-app-engine,google-cloud-datastore","A_Id":49137161,"CreationDate":"2018-03-06T17:11:00.000","Title":"Reuse datastore models across services without symlink","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I want to put jpg in dropzone from other window.\nCan I do that?\nIn my test I open new window (my html with jpg) and I want to drag and drop it to dropzone on my main window.\nI have error:\nMessage: stale element reference: element is not attached to the page document.\nMaybe there is another solution for placing this file eg from a disk?\nI've tried several ways, including loading from a file from the disk and sending it using send keys.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":87,"Q_Id":49148607,"Users Score":0,"Answer":"I solved the problem by creating a script in AutoIT.","Q_Score":0,"Tags":"python,selenium,drag-and-drop,webdriver","A_Id":49151725,"CreationDate":"2018-03-07T09:40:00.000","Title":"Can i use drag and drop from other window? Python Selenium","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Any Windows python developers here?\nI created a virtualenv, activated it and installed django. If I run pip3 list, it shows Django (2.0.3) as installed. The problem is when I try and use django, it never works, it just returns \"no module django.\"\nWhen I try pip3 install django again, it says it's already installed at myname\\envs...\\site-packages. But when I use the django command it never looks at this path, it looks at appdata\/local\/programs\/python\/python36-32\/python.exe (i.e. not the virtualenv but the python installation itself).\nAnyone have any ideas?","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":993,"Q_Id":49165004,"Users Score":0,"Answer":"You should use pip after active your virtualenv python environment","Q_Score":0,"Tags":"python,django,windows","A_Id":49166062,"CreationDate":"2018-03-08T03:40:00.000","Title":"How to setup Django inside virtualenv on Windows?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Use case: a single data structure (hashtable, array, etc) whose members are accessed frequently by multiple threads and modified infrequently by those same threads. How do I maintain performance while guaranteeing thread safety (ie, preventing dirty reads).\nJava: Concurrent version of the data structure (concurrent hashmap, Vector, etc).\nPython: No need if only threads accessing it, because of GIL. If it's multiple processes that will be reading and updating the data structure, then use threading.Lock. Force the each process's code to acquire the lock before and release the lock after accessing the data structure.\nDoes that sound reasonable? Will Java's concurrent data structure impose too much penalty to read speed? Is there higher level concurrency mechanism in python?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":113,"Q_Id":49179845,"Users Score":1,"Answer":"Instead of reasoning about performance, I highly recommend to measure it for your application. Don't risk thread problems for a performance improvement that you most probably won't ever notice.\nSo: write thread-safe code without any performance-tricks, use a decent profiler to find the percentage of time spent inside the data structure access, and then decide if that part is worth any improvement.\nI bet there will be other bottlenecks, not the shared data structure.\nIf you like, come back to us with your code and the profiler results.","Q_Score":0,"Tags":"java,python,multithreading,concurrency","A_Id":49180737,"CreationDate":"2018-03-08T18:14:00.000","Title":"Threaty safety vs performance in Java and Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using Django1.8 and I need help. how to display images and files on pythonanywhere by using model filefield and imagefield.\non my development server everything is ok.but during de production I have donne everything these two field.the parodox is bootstrap is well integread.\nmy project is on githb: Geyd\/eces_edu.git\nhelp me !!!","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":39,"Q_Id":49185114,"Users Score":1,"Answer":"You need to actually serve the files. On your local machine, Django is serving static files for you. On PythonAnywhere, it is not. There is extensive documentation on the PythonAnywhere help pages to get you started with configuring static files.","Q_Score":0,"Tags":"pythonanywhere","A_Id":49196785,"CreationDate":"2018-03-09T01:14:00.000","Title":"how to diplay file field and image field on pythonaywhere","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a query as to whether what I want to achieve is doable, and if so, perhaps someone could give me some advice on how to achieve this.\nSo I have set up a health check on Route 53 for my server, and I have arranged so that if the health check fails, the user will be redirected to a static website I have set up at a backup site.\nI also have a web scraper running regularly collecting data, and my question is, would their be a way to use the data I have collected, and depending on its value, either pass or fail the heath check, therefore determining what site the user would be diverted to.\nI have discussed with AWS support and they have said that their policies and conditions are there by design, and long story short would not support what I am trying to achieve.\nI'm a pretty novice programmer so I'm not sure if it's possible to work this, but this is my final hurdle so any advice or help would be hugely appreciated.\nThanks!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":42,"Q_Id":49198057,"Users Score":2,"Answer":"Make up a filename.  Let's say healthy.txt. \nPut that file on your web server, in the HTML root.  It doesn't really matter what's in the file.\nVerify that if you go to your site and try to download it using a web browser, it works.\nConfigure the Route 53 health check as HTTP and set the Path for the check to use \/healthy.txt.\n\nTo make your server \"unhealthy,\" just delete the file.  The Route 53 health checker will get a 404 error -- unhealthy.\nTo make the server \"healthy\" again, just re-create the file.","Q_Score":0,"Tags":"python,amazon-web-services,amazon-route53,health-monitoring","A_Id":49201020,"CreationDate":"2018-03-09T16:24:00.000","Title":"Intentionally Fail Health Check using Route 53 AWS","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm learning scrapy from a udemy tutorial. \nI've installed Scrapy to the following path:\n\nc:\\Users\\User\\Anaconda3\\Scripts\n\nafterwards I enter in the \"startproject\" command which creates the project \"quotes spider\" in a new folder with this path:\n\nc:\\Users\\User\\Anaconda3\\Scripts\\quotes_spider\n\nin the tutorial, the instructor changes his directory to that subfolder and is able to call scrapy from that subfolder.  \nWhen I try to do that i get the error:\n\n'scrapy' is not recognized as an internal or external command,\n  operable program or batch file.\n\nHow am I able to call scrapy from this subfolder??","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":62,"Q_Id":49199748,"Users Score":0,"Answer":"You will either need to add the path to where scrapy is located to your Path Environment Variable (if you're on Windows) or you could run it from your c:\\Users\\User\\Anaconda3\\Scripts and run the scrapy command with relative paths to your quotes_spider subfolder.","Q_Score":0,"Tags":"python-3.x,scrapy","A_Id":49200138,"CreationDate":"2018-03-09T18:11:00.000","Title":"run python in sub folder created after \"startproject\" command","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I try write a game with GoranM\/bdx plugin. When i create plate with texture and  try export to code I get fatal error.\n\nTraceback (most recent call last):\n    File \"C:\\Users\\Myuser\\AppData\\Roaming\\Blender Foundation\\Blender\\2.79\\scripts\\addons\\bdx\\ops\\exprun.py\", line 225, in execute\n      export(self, context, bpy.context.scene.bdx.multi_blend_export, bpy.context.scene.bdx.diff_export)\n    File \"C:\\Users\\Myuser\\AppData\\Roaming\\Blender Foundation\\Blender\\2.79\\scripts\\addons\\bdx\\ops\\exprun.py\", line 123, in export\n      bpy.ops.export_scene.bdx(filepath=file_path, scene_name=scene.name, exprun=True)\n    File \"C:\\Program Files\\Blender Foundation\\Blender\\2.79\\scripts\\modules\\bpy\\ops.py\", line 189, in call\n      ret = op_call(self.idname_py(), None, kw)\n  RuntimeError: Error: Traceback (most recent call last):\n    File \"C:\\Users\\Myuser\\AppData\\Roaming\\Blender Foundation\\Blender\\2.79\\scripts\\addons\\bdx\\exporter.py\", line 903, in execute\n      return export(context, self.filepath, self.scene_name, self.exprun, self.apply_modifier)\n    File \"C:\\Users\\Myuser\\AppData\\Roaming\\Blender Foundation\\Blender\\2.79\\scripts\\addons\\bdx\\exporter.py\", line 829, in export\n      \"models\": srl_models(objects, apply_modifier),\n    File \"C:\\Users\\Myuser\\AppData\\Roaming\\Blender Foundation\\Blender\\2.79\\scripts\\addons\\bdx\\exporter.py\", line 117, in srl_models\n      verts = vertices(mesh)\n    File \"C:\\Users\\Myuser\\AppData\\Roaming\\Blender Foundation\\Blender\\2.79\\scripts\\addons\\bdx\\exporter.py\", line 53, in vertices\n      vert_uv = list(uv_layer[li].uv)\n  IndexError: bpy_prop_collection[index]: index 0 out of range, size 0\nlocation: C:\\Program Files\\Blender Foundation\\Blender\\2.79\\scripts\\modules\\bpy\\ops.py:189\nlocation: :-1\n\nMaybe someone had same problem and you know how to fix it?","AnswerCount":1,"Available Count":1,"Score":-0.1973753202,"is_accepted":false,"ViewCount":1262,"Q_Id":49199787,"Users Score":-1,"Answer":"Go into Object Mode before calling that function.\nbpy.ops.object.mode_set(mode='OBJECT', toggle=False)","Q_Score":1,"Tags":"python,libgdx,blender,index-error","A_Id":58185138,"CreationDate":"2018-03-09T18:14:00.000","Title":"Blender IndexError: bpy_prop_collection","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"As an exercise, I came up with an idea of the following Django project: a web app with literally one button to scrape room data from Airbnb and one text area to display the retrieved data in a sorted manner.\nPreferably, for scraping I would like to use Selenium, as there is no API for this page. So the button would somehow need to launch the browser automation.\nSo question number one is: is it possible to launch selenium from a web app?\nFurthermore, I already have the working script for collecting the data, however I dont't know how to fit it in a Django project: models, views, separate script? My initial idea was to launch the scraping script on button click, then dump retrieved room-related data to database (updating model's Room attributes like \"price\" and \"link\" for example) and display the data back in the text area mentioned before. \nSo question two is: is it possbile to launch Python script in a web app on button click, for example by nesting in a Django template? Or would other technologies be required, such as Javascript?\nI know my question is general, but I am also looking for general advice, not a ready code sample. I am also open to other approach if what I just wrote doesn't make any sense.","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":740,"Q_Id":49206319,"Users Score":2,"Answer":"The simplest option would be a view function (i.e. a function linked to a URL that receives a GET or POST request) in your app which does the scraping and immediately returns the results by rendering a template. For example you could have a starting page with a form and when that form is submitted that will create a POST request which will contain details that the view can use to decide which page to scrape and so on. This doesn't require Javascript or database models.\nIf you're not comfortable with Django yet, consider starting with Flask instead as it's simpler to get going.","Q_Score":0,"Tags":"python,django","A_Id":49206357,"CreationDate":"2018-03-10T07:01:00.000","Title":"How to scrape data from inside Django app","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"As an exercise, I came up with an idea of the following Django project: a web app with literally one button to scrape room data from Airbnb and one text area to display the retrieved data in a sorted manner.\nPreferably, for scraping I would like to use Selenium, as there is no API for this page. So the button would somehow need to launch the browser automation.\nSo question number one is: is it possible to launch selenium from a web app?\nFurthermore, I already have the working script for collecting the data, however I dont't know how to fit it in a Django project: models, views, separate script? My initial idea was to launch the scraping script on button click, then dump retrieved room-related data to database (updating model's Room attributes like \"price\" and \"link\" for example) and display the data back in the text area mentioned before. \nSo question two is: is it possbile to launch Python script in a web app on button click, for example by nesting in a Django template? Or would other technologies be required, such as Javascript?\nI know my question is general, but I am also looking for general advice, not a ready code sample. I am also open to other approach if what I just wrote doesn't make any sense.","AnswerCount":2,"Available Count":2,"Score":0.1973753202,"is_accepted":false,"ViewCount":740,"Q_Id":49206319,"Users Score":2,"Answer":"Django follows MVT i.e Model (part where you write things related to the database ) , View (the logic analogous to what we did in controller - ref. Java) , Template(things that you'll actually see) . \n As suggested by Alex you can have some inputs collected on your home page and using that data to scrape desired pages. \nComing to your next question, yes you can launch the script on button click and basic working knowledge of JS would do good. \nThis is like a very general answer synonymous to how general the question is so please feel free to get more specific requests if needed.","Q_Score":0,"Tags":"python,django","A_Id":50174783,"CreationDate":"2018-03-10T07:01:00.000","Title":"How to scrape data from inside Django app","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How does Django handles multiple requests in production environment?\nSuppose we have one of web server: Apache, Nginx, gunicorn etc.\nSo do those servers for any request from web browser start new process to serve that request?\nIf it's true, doesn't it cause huge overhead?\nIf it's not true, then how the same view (let it be def hello(request) view bound to \/hello url) serve several requests at the same time.\nI've seen answers for question \"... handle multiple users\"","AnswerCount":1,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":21206,"Q_Id":49213647,"Users Score":26,"Answer":"Django handles just a request at a time.\nIf you use the very old CGI interface (between your web-server and Django), a new Django process is started at every request.  But I think nobody do this.\nThere are many additional interfaces on web servers, not do load at every request a new server side program. FastCGI is one of these (agnostic to programming language), some programs have own module directly implemented in web server (e.g. mod-php) [python had this in the past]. But now Django and in general python, prefer WSGI interface.\nSo webserver open one or more programs (Django app) in parallel. The web server will send request to a free process (or it queue requests, this is handled by web server).  How many processes, and for how long, it depend on web server configuration.\nThe databases supported by django supports concurrency, so there is no problem on having different processes handling the same app. [SQLite is different, but you should use this, just for developing\/testing Django]. By writing to some log files [usually multiline], one could see some problems (parallel process which write at the same time, the same file). \nNOTE: in such explanation I use \"web server\" in a broad sense. This includes gunicorn, mod-wsgi etc.","Q_Score":34,"Tags":"python,django,wsgi","A_Id":49214051,"CreationDate":"2018-03-10T20:22:00.000","Title":"How does Django handle multiple requests?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"The field validation process can happen in 'Django Model level field declaration' or in 'Deserialization of data on DRF serialization section'. I have the following concerns regarding this validation process:\n\nWhat is the separation of concerns? Which validation section should be placed where?\nHow the DRF serialization section restricts manual database entry with the validation?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":735,"Q_Id":49218802,"Users Score":2,"Answer":"Serializers are concerned with translating information to\/from different formats for a model (text\/json, etc.), and so the validation is in reference to this.\nModel validation is a lower-level check, where the creation\/modification of a db model is done. I always have model validation, even if I have serialization validation.","Q_Score":4,"Tags":"python,django,django-rest-framework","A_Id":49223577,"CreationDate":"2018-03-11T10:05:00.000","Title":"Django Model field validation vs DRF Serializer field validation","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"i have a django project which was uploaded to heroku. In my django project I used redis also to store some data. the application works on heroku but It happens that when ever I click a link, I get the error Server Error (500) I do not know the cause of the error but here is my redis setting that I use on local and development server.\n#REDIS FOR VIEWS\nREDIS_HOST = 'localhost'\nREDIS_PORT = 6379\nREDIS_DB = 3\nfurther codes would be provided on request","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":91,"Q_Id":49221999,"Users Score":0,"Answer":"Well, Redis isn't going to be running on localhost on Heroku.\nYou don't say how you have set up Redis, but presumably you are using one of the add-ons available through Heroku. These usually expose their configuration through an environment variable, which you would then use in your settings.py exactly as you do for the database settings. The add-on documentation itself will tell you what variable to use.","Q_Score":1,"Tags":"python,django,heroku,redis","A_Id":49222038,"CreationDate":"2018-03-11T15:59:00.000","Title":"django heroku server error","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm running a python flask application on uswgi with 4 workers.\nThe application has a cache that needs to be periodically refreshed and warmed up. I'd like to do this with an external job that hits a url but I need to ensure the cache is warmed up on all 4 workers.\nIs there a way to route a request to a particular worker? Ideally I'd just like to have a special header or query parameter that does this.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":899,"Q_Id":49231130,"Users Score":0,"Answer":"Worker load balancing is handled by the kernel and there's no way to force requests to hit a specific worker.\nYou'll have to either move your cache to somewhere all workers can access (redis, mongo, sql db, etc) or have a process\/thread running on your workers to refresh the cache (Celery, etc)","Q_Score":7,"Tags":"python,flask,uwsgi","A_Id":57765810,"CreationDate":"2018-03-12T08:44:00.000","Title":"Routing a request to a particular uwsgi worker","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have required to send POS Receipt to customer while validating POS order, the challenge is ticket is defined in point_of_sale\/xml\/pos.xml \nreceipt name is <t t-name=\"PosTicket\"> \nhow can i send this via email to customer.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":205,"Q_Id":49235894,"Users Score":0,"Answer":"You can create a wizard at the time of validation of POS order which popup after validating order. In that popup enter mail id of customer and by submit that receipt is directly forwarded to that customer.","Q_Score":0,"Tags":"python-3.x,odoo,point-of-sale,odoo-11","A_Id":52870087,"CreationDate":"2018-03-12T12:59:00.000","Title":"Send POS Receipt Email to Customer While Validating POS Order","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I understand that both models.Model and forms.ModelForm both contain .save() method that you can override. My question is how and when are they used to save an object and in what sequence.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":35,"Q_Id":49253395,"Users Score":2,"Answer":"ModelForm.save() is called first and it is calling Model.save() internally.\nMethod in ModelForm is an helper to build or update Model object from data provided in form and save it to database. It also saves any many to many or reversed foreign key relations.","Q_Score":2,"Tags":"python,django","A_Id":49253516,"CreationDate":"2018-03-13T10:09:00.000","Title":"In what sequence Model.save() and ModelForm.save() called","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How can you run Flask app which uses a specific version of python?\nOn my env \"python\" = python2.7 and \"python3\" = python3.6. I have installed Flask using pip3. I start the app with FLASK_APP=app.py flask run. It uses python2.7 to execute, I would like it to use python3.6.\nAlso tried adding #!flask\/bin\/python3 to app.py, but it did not have an effect.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":17444,"Q_Id":49255283,"Users Score":0,"Answer":"What I did was:\n\nwhich flask, to find flask binary executable path (in my case \/home\/myuser\/.local\/bin\/flask\nedit \/home\/myuser\/.local\/bin\/flask, changing the first line from #!\/usr\/bin\/python to #!\/usr\/bin\/python3\n\nIn summary, making flask use python3, regardless of which shebang was specified in other scripts, since those scripts are not the entrypoint of execution, but flask is. I didn't have to change the shebang in any of my scripts, just the flask executable.","Q_Score":8,"Tags":"python,python-3.x,flask","A_Id":61596986,"CreationDate":"2018-03-13T11:42:00.000","Title":"Run Flask using python3 not python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"unable to import\nfrom rest_framework_httpsignature.authentication import SignatureAuthentication\n in django 1.8v and python 2.7.6 ,it causeing importing error only to this class  SignatureAuthentication in vs studio , please help but i can able to import this class rest_framework.authentication using djangorestframework==3.4.1 and djangorestframework-httpsignature==0.2.1","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":62,"Q_Id":49256259,"Users Score":0,"Answer":"You have somewhere in your code import from rest_framework_httpsignature which is not installed. It can be either set in your settings file as default authentication method for DRF or used somewhere in other default authentication method.","Q_Score":0,"Tags":"django,python-2.7","A_Id":49256519,"CreationDate":"2018-03-13T12:29:00.000","Title":"import error rest_framework_httpsignature.authentication django rest frame work?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working in this shared Django project, a colleague is the owner of the repo in Github. The problem I am facing right now is that he added raven to his packages and in github the requirements.txt file is updated, however when I tried with git pull, locally, my requirements.txt does not have raven added. He told me that I have to reinstall requirements.txt so I tried with pip freeze > requirements.txt but nothing change.\nHow can I update my requirements.txt file according the updates made from Github?","AnswerCount":3,"Available Count":2,"Score":0.0665680765,"is_accepted":false,"ViewCount":1223,"Q_Id":49263913,"Users Score":1,"Answer":"Make sure the requirements.txt is not inside the .gitignore file, which will prevent it from being updated.","Q_Score":0,"Tags":"python,django,github,requirements.txt","A_Id":49264255,"CreationDate":"2018-03-13T18:58:00.000","Title":"How to reinstall requirements.txt","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working in this shared Django project, a colleague is the owner of the repo in Github. The problem I am facing right now is that he added raven to his packages and in github the requirements.txt file is updated, however when I tried with git pull, locally, my requirements.txt does not have raven added. He told me that I have to reinstall requirements.txt so I tried with pip freeze > requirements.txt but nothing change.\nHow can I update my requirements.txt file according the updates made from Github?","AnswerCount":3,"Available Count":2,"Score":0.1325487884,"is_accepted":false,"ViewCount":1223,"Q_Id":49263913,"Users Score":2,"Answer":"After you've pulled the latest changes into your requirements.txt, you can absolutely rerun pip.  Run the command with pip install -r requirements.txt and it will install any new modules.","Q_Score":0,"Tags":"python,django,github,requirements.txt","A_Id":49263958,"CreationDate":"2018-03-13T18:58:00.000","Title":"How to reinstall requirements.txt","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"How can I get a model name as a \"string\" from a model instance. \nI know you can do something like type(model_instance)\nbut this is returning the class itself as an object <Model_Name: > not as a string.","AnswerCount":3,"Available Count":1,"Score":-0.1973753202,"is_accepted":false,"ViewCount":7372,"Q_Id":49268210,"Users Score":-3,"Answer":"By defining the str or unicode method ?","Q_Score":8,"Tags":"python,django,models","A_Id":49268219,"CreationDate":"2018-03-14T00:54:00.000","Title":"Get model name from instance","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am running Windows 7 with Python 3.6 and no other versions. I installed Django through pip successfully. Yet when I try to make new virtual project, I get \"DNS not authoritativer error\". I am logged in and running cmd prompt as Admin. What could be the issue here?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":418,"Q_Id":49285022,"Users Score":0,"Answer":"SOLVED. \nMy PATH variable was sloppy. Instead of ending the variable with \"\\\". I had ended it with \";\"","Q_Score":0,"Tags":"python,django,dns","A_Id":49289349,"CreationDate":"2018-03-14T18:16:00.000","Title":"\"mkvirtualenv myproject\" command giving \"DNS server not authoritative for the zone\" error","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"lets say i have used with selenium\nchrome_options.add_argument(\"--headless\")\nbut now i want the browser to open. Is this possible? thanks","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":51,"Q_Id":49290655,"Users Score":0,"Answer":"No, it isn\u2019t possible.\nThe --headless option is a command-line flag used to instantiate the browser, meaning it is being told to execute headlessly for the entirety of its existence.","Q_Score":0,"Tags":"python,selenium,selenium-chromedriver","A_Id":49301624,"CreationDate":"2018-03-15T02:31:00.000","Title":"How to open headless browser in selenium?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am really new to Google API key.\nWhen am I testing my code on the local system, it is working fine but on an actual server it giving me SSLHandshakeError.\nServer configuration: nginx + unicorn + ubuntu + django + Python 2.7\nSSLHandshakeError at 'url'\n[Errno 1] _ssl.c:510: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":96,"Q_Id":49313123,"Users Score":0,"Answer":"I just found the solution for my question, the error was coming due to package httplib2.\nI have just updated requests and httplib2.\npip install -U httplib2\npip install -U requests[security]","Q_Score":0,"Tags":"python,django,google-api","A_Id":49332855,"CreationDate":"2018-03-16T04:14:00.000","Title":"Google API key not working on server but working fine on local server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm wondering if there's a way how to share context between individual:\n\nthreads\ninstances\n\non Google App Engine. I assume memcache would do the job, but in my case the context is just a single integer and memcache sounds like an overkill.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":58,"Q_Id":49324572,"Users Score":4,"Answer":"Assuming your application is running on GAE Standard:\n\nIn theory there may be ways to share state between threads that run on the same instance. In Python, this could take the form of a module level variable. This might make sense for extremely specialized types of caching, but it isn't reliable or durable because instances come and go over time. It also introduces the idea of cold and warm instances, which will make performance metrics harder to interpret.\nThere is not a way to share state between instances without using another system like Memcache or Datastore. It may seem like overkill for a small dataset, but those tools are probably what you're looking for.","Q_Score":1,"Tags":"python,google-app-engine","A_Id":49327295,"CreationDate":"2018-03-16T15:38:00.000","Title":"GAE: How to share context between threads and\/or instances","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"The default database of the Django is sqlite, however I want to use MYSQL instead.Since the MYSQLdb module is not supported in python3.x, the official doc of django recommend using mysqlclient and MySQL Connector\/Pythoninstead.Here is the original doc:\n\nMySQL has a couple drivers that implement the Python Database API described in PEP 249:\n  \u2022 mysqlclient is a native driver. It\u2019s the recommended choice.\n  \u2022 MySQL Connector\/Python is a pure Python driver from Oracle that does not require the MySQL client library\n  or any Python modules outside the standard library.\n  These drivers are thread-safe and provide connection pooling.\n  In addition to a DB API driver, Django needs an adapter to access the database drivers from its ORM. Django provides\n  an adapter for mysqlclient while MySQL Connector\/Python includes its own.\n\nI've got the latest version of mysql-client and mysql-connector-python, but as I execute themigratecommand, error occurs.Here is part of the message:\n\nUnhandled exception in thread started by .wrapper at 0x7f2112e99d90>\n  Traceback (most recent call last):\n    File \"\/home\/lothakim\/anaconda3\/envs\/py36\/lib\/python3.6\/site-packages\/django\/db\/backends\/mysql\/base.py\", line 15, in \n      import MySQLdb as Database\n  ModuleNotFoundError: No module named'MySQLdb'django..........core.exceptions.ImproperlyConfigured: Error loading MySQLdb module.Did you install mysqlclient?\n\nIt seems to be the problem of the database connection.But I followed every step of the official tutorial.How can I fix this problem?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":761,"Q_Id":49345950,"Users Score":1,"Answer":"It's a silly mistake...\nI confuse the mysql-client with mysqlclient.The former is part of the MYSQL application, while the latter is a python module.I didn't install the latter.Also note you should sudo apt-get install libmysqlclient-devbefore pip install mysqlclient.","Q_Score":3,"Tags":"python,mysql,django","A_Id":49346089,"CreationDate":"2018-03-18T08:33:00.000","Title":"How do I use MYSQL as the database in a Django project?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm building a dedicated OAuth2 as a service for my application, where users will be both authenticating and authorizing themselves. \nI've the following concerns\n1) Is OAuth2 TokenScope similar to Django Permissions?\n2) If I want to make role-level hierarchy application, how do I go about building one with OAuth2?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":59,"Q_Id":49356867,"Users Score":1,"Answer":"Actually there is a difference between Django permissions and OAuth token scope, Django permissions use for define access level to your endpoint addresses like when you want just authenticated user see some data but OAuth token scope is for time you want to have third-party login and you define when somebody login what access he\/she has, like when you authenticate from Gmail in scope Gmail, for example, says read and you just have read access when you login .\nand I didn't get you concern number 2","Q_Score":1,"Tags":"python,django,django-permissions,django-oauth","A_Id":53847566,"CreationDate":"2018-03-19T06:18:00.000","Title":"Is OAuth2 TokenScope similar to Django Permissions?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to write a migration which grants readonly permissions to each schema in my multi-tenant postgres DB. \nThe migrations run once per schema, so what I would like to do would be capture the name of the schema for which it is running, and then use that schema_name in my SQL statement to grant permissions for that schema. \nIn django, I can create a migration operation called 'RunPython', and from within that python code I can determine for which schema the migrations are currently running (schema_editor.connection.connection_name). \nWhat I want to do is pass that information to the next migration operation, namely \"RunSQL\", so that the SQL I run can be:\n\"GRANT SELECT ON ALL TABLES IN SCHEMA {schema_name_from_python_code} TO readaccess;\"\nIf anyone can shed any light on this issue it would be greatly appreciated. Cheers!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":668,"Q_Id":49389756,"Users Score":0,"Answer":"I was able to figure this out by getting rid of the migrations.runSQL. I just have migrations.RunPython. From within that python forward_func I am able to access the DB and write sql there (with the necessary string interpolation) \n:)","Q_Score":0,"Tags":"django,python-3.x,postgresql,multi-tenant,django-migrations","A_Id":49412917,"CreationDate":"2018-03-20T16:41:00.000","Title":"How to combine migrations.RunPython and migrations.RunSQL in django migration operation","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a django app deployed on multiple VMs behind a load balancer. On each django. I want to setup celery and RabbitMQ for the app. Each django app would be running a celery worker, and some of the VMs should be running RabbitMQ in a cluster setup and if a celery worker executes a task others shouldn't execute the same task. Is this approach for setting up celery and RabbitMQ good. Can anyone guide me to how this can be setup (Configurations, tutorial, etc.)?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":458,"Q_Id":49396130,"Users Score":0,"Answer":"For a better use case what you can do is run only a single RabbitMQ instance so if any celery worker can pick the task from queue and after picking up the task it will be removed from the queue so that it would not executed multiple times. Or another thing what you can do is to run celery and rabbitmq on a single separate VM and increase the number of workers of celery while running celery if this helps in your use case.","Q_Score":0,"Tags":"django,python-3.x,rabbitmq,celery,django-celery","A_Id":49414639,"CreationDate":"2018-03-21T00:10:00.000","Title":"Django and RabbitMQ setup","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am trying to implement some changes into a deployed Flask API.\nAm I able to edit files in the deployed API and have the changes take effect without having the restart the API build?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":119,"Q_Id":49396485,"Users Score":0,"Answer":"Webserver restart is necessary for changes to take effect.\nAfter changes issues below command. The lag will be only in seconds.\nsudo service apache2 restart\nPs. - Need root user permission for this.","Q_Score":1,"Tags":"python,flask,flask-sqlalchemy,flask-restful,flask-admin","A_Id":67429490,"CreationDate":"2018-03-21T00:54:00.000","Title":"Editing a Flask API","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We are trying our luck with robot framework for tests. Automation. I am stuck at database connection at this point.\nA DB connection using cx_Oracle is displaying an error saying \u201c No keyword withy the name  cx_Oracle\u2019 . If you have any idea please help . It will be helpful if you could put out an example of the Oracle dB connection sample.","AnswerCount":5,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":4004,"Q_Id":49398152,"Users Score":0,"Answer":"It was indeed an installation issue. We had to use Anaconda3 and had to installed the library under its site-packages . I had this one under default Python folder.The issue is now resolved .","Q_Score":0,"Tags":"python,oracle,robotframework","A_Id":49469043,"CreationDate":"2018-03-21T04:22:00.000","Title":"Robot Framework : how to connect to Oracle database","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I gave a requirement involving SMS and AWS platform, the requirement is - users can send SMS to a mobile number and I need to store the SMS and it's metadata into AWS RDS or DynamoDB or any AWS compatible storage. These SMS will be used to populate a realtime dashboard.\nAnyone here came across such a scenario? or any tools or technologies I could use to resolve it?\nThanks a ton for your replies,\nArun","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1531,"Q_Id":49399530,"Users Score":0,"Answer":"As far as I know, receiving international SMS is free and without hassle on the receiver's side. Unlike sending SMS which AWS SNS provide\nSo that separate the SMS receiving business and the storage business. To receive SMS you can look at Nexmo or Twilio.\nPlease note that SMS fails regularly and the sender is charged for international SMS most of the time","Q_Score":2,"Tags":"python,amazon-web-services,mobile,sms,amazon-sns","A_Id":49400763,"CreationDate":"2018-03-21T06:20:00.000","Title":"Receive SMS from users and store in AWS","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am building a Flask app that uses a docx template to build a Word document. If I set threaded=True in app.run() will Flask handle the critical region properly as multiple users access the file on the server concurrently?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":83,"Q_Id":49434267,"Users Score":2,"Answer":"Flask doesn't know what your code does. It's up to you to put whatever checks you need before taking an action. HTTP is a stateless protocol, you cannot make assumptions about how and when workers will access other data.\nthreaded=True just enables multiple workers so that the development server can handle concurrent requests.","Q_Score":0,"Tags":"python,multithreading,flask","A_Id":49434779,"CreationDate":"2018-03-22T16:53:00.000","Title":"Do flask threads handle file access?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to Django. Would be really helpful if someone can tell the difference between @cached_property and @lru_cache decorator in Django. \nAlso when should I use which decorator in Django. Use cases would be really helpful.\nThanks.","AnswerCount":3,"Available Count":1,"Score":0.3215127375,"is_accepted":false,"ViewCount":9063,"Q_Id":49436833,"Users Score":5,"Answer":"They serve different purposes. \nlru_cache saves the least recent uses - you should specify maxsize which distinguishes how many computations of your function you can save. Once you surpass this number, the 'oldest' result is discarded and the new one is saved.\ncached_property just computes the result and saves it. It doesn't take arguments unlike lru_cache (you can think of it as a lru_cache on an object type with maxsize = 1 with no arguments).","Q_Score":21,"Tags":"python,django","A_Id":49437018,"CreationDate":"2018-03-22T19:21:00.000","Title":"Difference between @cached_property and @lru_cache decorator","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to deploy a Python app via mod_wsgi in Apache httpd, running into a strange error.\nI'm using my firm's custom python package (2.7), besides this there is another Python intsallation, shipped with the OS (different version, 2.6 something). The issue is, when I define the \nWSGIPythonHome and WSGIPythonPath variables in my httpd conf, I'm flooded with \"ImportError: no module named site\" errors in the error_log. Looking at other answers, defining those variables would be the solution for such errors.\nIf I switch user to the apache user, with being the PYTHONPATH and PYTHONHOME env variables set, when I try to start Python 2.7, I'm getting the same error.\nAfter unsetting the variables, Python is able to start normally.\nSo I've tried removing the WSGIPythonHome and WSGIPythonPath from the  httpd conf, but in that case, nothing happens, the wsgi script is not executed, as nothing is pointing Apache to my python executable.\nThe mod_wsgi.so has been installed with pip, and loaded from the same path as my PYTHONPATH would be for 2.7","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":542,"Q_Id":49438421,"Users Score":0,"Answer":"It is likely that mod_wsgi Apache is using is compiled for Python 2.6. You cannot make mod_wsgi compiled for Python 2.6, work with a Python 2.7 installation or virtual environment.\nYou should verify what Python version mod_wsgi was compiled for by running ldd on the mod_wsgi.so binary. Don't assume it is using the pip installed version, you may still have system mod_wsgi installed.\nIf it is the system mod_wsgi package and it is compiled for Python 2.6, you will need to uninstall it.","Q_Score":0,"Tags":"python,apache,mod-wsgi","A_Id":49438521,"CreationDate":"2018-03-22T21:02:00.000","Title":"Unable to run python with mod_wsgi","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to deploy a flask app I made to Heroku with success.\nThe app is generated but I get errors when I push the code to the Heroku repository.\nMy flask app is inside a module called server.py and the variable is named app.\nAt first I tried using gunicorn and writing \nweb: gunicorn server:app\nand deplying but no web dynos were up and I get an error stating it is the Procfile file.\nRed about it about and saw that Gunicorn is not really working on windows so I tried installing Waitress and deploying without success. this time my profcile was written as all of these (tried several times):\nweb: waitress-serve --listen=*:8000 server.wsgi:application\nweb: waitress-serve --listen=*:8000 app.wsgi:application\nAnd so on.\nto add a web dyno I should scale it because heroku ps: showes that there is no dynos.\nWhen I try to run heroku ps:scale web=1 I get:\nScaling dynos... !\n \u25b8    Couldn't find that process type.\nWhat am i doing wrong?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":873,"Q_Id":49468872,"Users Score":0,"Answer":"I was having the same problem. Particularly, waitress works locally in Windows (inside a Procfile.windows file web: waitress-serve index:server, then with heroku CLI heroku local -f Procfile.windows), but failed after Heroku deployment. Workaround for me was to locally test with waitress (like explained), but deploy with gunicorn (web: gunicorn index:server inside Procfile). Let me know if this works for you.","Q_Score":3,"Tags":"python,windows,heroku,waitress","A_Id":62723048,"CreationDate":"2018-03-24T19:19:00.000","Title":"Deploying a python flask web application on Heroku with Windows","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to log every Static Files request and the request IP address in Django. \nIn Console I am able to check the Static File Log, But I want access those logs inside an Django View with IP address of the request\nCan Suggest an solution or any work around.\nI am planning to server static files manually and perform logging.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":95,"Q_Id":49479612,"Users Score":0,"Answer":"Solved, I Created an view to serve static files manually using Django in-built 'serve' method, In which I get the IP Address of the Request using meta data of the Request","Q_Score":0,"Tags":"python,django,file,logging,static","A_Id":49480708,"CreationDate":"2018-03-25T18:48:00.000","Title":"How to Access Static file logs inside an view in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"At first, I am learning Python and Django only... So I'm a noobie yet.\nI need to build a microservice architecture to I could run each my service on a separate server machine. In the Django I need to create an environment, project and apps. So, can I run these apps after on different servers? If no, how can I make it with Django? Do I need to create a separate project for each service?\nP.S. If my question is stupid, pls, explain where am I wrong. I am from Java Spring world where I was need to create just new app for each service.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":36,"Q_Id":49480796,"Users Score":1,"Answer":"Either approach will work.\nIf it makes sense for your services to share the same code base, you can create a single project and use separate apps for each service and separate settings files for each deployment. The settings file would activate the desired app by listing it in INSTALLED_APPS, and would include settings specific to that service.\nOr, if you don't need the services to be coupled in that way, you could certainly make each one its own project.","Q_Score":0,"Tags":"django,python-3.x","A_Id":49482862,"CreationDate":"2018-03-25T20:50:00.000","Title":"Different IPs are for different apps","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm crawling web pages to create a search engine and have been able to crawl close to 9300 pages in 1 hour using Scrapy. I'd like to know how much more can I improve and what value is considered as a 'good' crawling speed.","AnswerCount":3,"Available Count":2,"Score":-0.0665680765,"is_accepted":false,"ViewCount":453,"Q_Id":49494093,"Users Score":-1,"Answer":"I'm no expert but I would say that your speed is pretty slow. I just went to google, typed in the word \"hats\", pressed enter and: about 650,000,000 results (0.63 seconds). That's gonna be tough to compete with. I'd say that there's plenty of room to improve.","Q_Score":5,"Tags":"python,scrapy,web-crawler","A_Id":49523000,"CreationDate":"2018-03-26T14:38:00.000","Title":"What is a good crawling speed rate?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm crawling web pages to create a search engine and have been able to crawl close to 9300 pages in 1 hour using Scrapy. I'd like to know how much more can I improve and what value is considered as a 'good' crawling speed.","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":453,"Q_Id":49494093,"Users Score":0,"Answer":"It really depends but you can always check your crawling benchmarks for your hardware by typing scrapy bench on your command line","Q_Score":5,"Tags":"python,scrapy,web-crawler","A_Id":70224507,"CreationDate":"2018-03-26T14:38:00.000","Title":"What is a good crawling speed rate?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Lets say I have a Django model object that requires to update a particular field if the last_updated datetime field is equal to today's date. \nIf I were to use F expression to avoid race condition, what would be the best way to compare the date from last_updated with current date using timezone.now().date()?","AnswerCount":3,"Available Count":1,"Score":0.0665680765,"is_accepted":false,"ViewCount":2059,"Q_Id":49507921,"Users Score":1,"Answer":"If you're looking to filter based on date, and your model has a DateTime field, you can simply use Django's __date lookup:\nMyModel.objects.filter(last_updated__date=timezone.now().date()).update(...)\nAlso, as a general note, remember that your code's timezone behavior will affect comparisons between timestamps and dates (i.e. the same timestamp might correspond to different dates depending on which timezone is in use).","Q_Score":3,"Tags":"python,django,django-models","A_Id":50280992,"CreationDate":"2018-03-27T08:28:00.000","Title":"Getting date from Django datetime field with F() expression","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to create a page where anyone can see the homepage without login, Any idea?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":29,"Q_Id":49529119,"Users Score":0,"Answer":"Simply Remove all the accesses for the public users in settings but check PORTAL USER box under Other Extra Rights. So when a user views the homepage, there won't be any login. Users can view the homepage without logged in.","Q_Score":0,"Tags":"python,web,odoo-8,odoo,qweb","A_Id":49531546,"CreationDate":"2018-03-28T08:01:00.000","Title":"ODOO-v8 :How to view the homepage alone without logged in?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Django application that is successfully being hosted on a remote server using Nginx. The production DB is PostgreSQL. \nI have a development server where I'd like to change the code for the Django application. When I use python manage.py runserver for testing, I'd ideally prefer to avoid touching the production DB at all. \nThis is my first time crossing this bridge. Can someone shed some light on the best practice for 'stubbing' the entire database for development? Can you do some if\/else statement in settings.py to use SQLite? Or is there a better solution?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":87,"Q_Id":49544913,"Users Score":1,"Answer":"You can definitely use if\/else statements in settings.py, or any Python code really.\nCommon practice is to put values which differ, especially secrets like database passwords, in environment variables. You set these to different values in production or locally and access them in Python using os.environ.","Q_Score":0,"Tags":"python,django,postgresql","A_Id":49544986,"CreationDate":"2018-03-28T22:03:00.000","Title":"Best way to modify Django application without affecting production database?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Now i am developing a website in django. But i used MySQLdb to connect with the database instead of django ORM since django ORM doesn't support multiple keys.\nI will explain my question with a example, consider i am writing a dictionary to database having type longtext. Hence i have used json.dumps() method to write database.\nI am reading those field using another url, hence while coding view function for reading i have used json.loads() method to get the dictionary back and here is my question arise. Whether i need to handle the exception when database field hold a non json string. If database field hold a non json string json.loads() will produce ValueError.\nWhether i need to catch those type of error since chance of having database with non json string is very little.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":30,"Q_Id":49550077,"Users Score":0,"Answer":"It's down to preference but personally I try to catch all potential errors, you never know what other issues they might expose.\nAnd ofcourse, there's the \"Zen of Python\": \"Errors should never pass silently.\nUnless explicitly silenced\"","Q_Score":0,"Tags":"python,json,django,django-testing","A_Id":49550213,"CreationDate":"2018-03-29T07:14:00.000","Title":"How to code a django site efficiently while accessing database using MySQLdb?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to connect to MSSQL database from AWS Lambda (using python) and really struggling to proceed further.\nI tried many options with pyodbc, pypyodbc, pymssql they work on local development machine (Windows 7), however AWS Lambda is unable to find the required packages when deployed on AWS. I use ZAPPA for deployment of Lambda package.\nI searched through many forums but unable to see the anything moving ahead, any help on this would be highly appreciated.\nMany thanks,\nAkshay","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":2801,"Q_Id":49556382,"Users Score":1,"Answer":"Try to do import cython together with pymssql in your code.","Q_Score":5,"Tags":"python,sql-server,amazon-web-services,aws-lambda","A_Id":70156360,"CreationDate":"2018-03-29T12:42:00.000","Title":"Use MSSQL with AWS Lambda","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I used to configure the application name in app.yaml. But I just re-read the latest docs, and they say:\n\nThe recommended approach is to remove the application element from your app.yaml file and instead, use a command-line flag to specify your application ID:\nTo use the gcloud app deploy command, you must specify the --project flag:\ngcloud app deploy --project [YOUR_PROJECT_ID]\nTo use the appcfg.py update command, you specify the -A flag:\nappcfg.py update -A [YOUR_PROJECT_ID]\n\nBut what about dev_appserver.py? How do I configure it with the project name?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":162,"Q_Id":49558119,"Users Score":3,"Answer":"dev_appserver.py also supports the -A flag to set the application id.\nFrom the output for dev_appserver.py -h:\n\n-A APP_ID, --application APP_ID\n                          Set the application, overriding the application value\n                          from the app.yaml file. (default: None)","Q_Score":3,"Tags":"google-app-engine,google-app-engine-python","A_Id":49559800,"CreationDate":"2018-03-29T14:02:00.000","Title":"How to configure application name when running dev_appserver.py?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm developing a chatbot using heroku and python. I have a file fetchWelcome.py in which I have written a function. I need to import the function from fetchWelcome into my main file. \nI wrote \"from fetchWelcome import fetchWelcome\" in main file. But because we need to mention all the dependencies in the requirement file, it shows error. I don't know how to mention user defined requirement.\nHow can I import the function from another file into the main file ? Both the files ( main.py and fetchWelcome.py ) are in the same folder.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":694,"Q_Id":49561062,"Users Score":0,"Answer":"If we need to import function from fileName into main.py, write \"from .fileName import functionName\". Thus we don't need to write any dependency in requirement file.","Q_Score":0,"Tags":"python,heroku","A_Id":49571369,"CreationDate":"2018-03-29T16:33:00.000","Title":"Heroku Python import local functions","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In Beam 2.3.0, the DoFn process API needed to return a generator through yield while in Beam 2.4.0, returning an object like dictionary from the process API works fine. \nIs there a change in programming model from 2.3.0 to 2.4.0 ? For large scale Google Cloud Dataflow processing, is yield (generator) preferred over returning objects (list, dict) from the DoFn process API ?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2370,"Q_Id":49562470,"Users Score":2,"Answer":"My understanding is that you want to return an iterable. So if you return a dictionary, the output will really be the list of its keys. I stick with only using yield for simplicity.","Q_Score":2,"Tags":"python,google-cloud-dataflow,apache-beam","A_Id":49582755,"CreationDate":"2018-03-29T18:01:00.000","Title":"DoFn process return type","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"In django, is there a way to find which rows were changed during a transaction?\nThere are CDC frameworks out there, however I would like to find the changes of a specific transaction with some sort of an ID. I would also want this to be synchronous with the rest of the runtime code.\nCheers","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":168,"Q_Id":49601575,"Users Score":0,"Answer":"You can try django debug toolbar. There are many option to track requests.\nPretty sure you will find something.","Q_Score":0,"Tags":"python,django,database,transactions","A_Id":49601633,"CreationDate":"2018-04-01T18:57:00.000","Title":"Is there a way to track transaction changes in Django ORM?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is there a way to use Celery for:\n\nQueue a HTTP call to external URL with Form parameters (HTTP Post to\nURL)\nThe external URL will respond HTTP response, 200, 404, 400 etc, if\nresponse is in form of error non-200-ish response it will retry for\na certain number of retry and will retire as needed\nAdd Task \/ Job \/ Work queue into Celery using REST API, passing the URL to call and Form parameters","AnswerCount":3,"Available Count":1,"Score":0.0665680765,"is_accepted":false,"ViewCount":7519,"Q_Id":49608179,"Users Score":1,"Answer":"you can use flower rest API to do the same, as flower is a monitoring tool for celery. But it comes with rest api to add task and all\nhttps:\/\/flower.readthedocs.io\/en\/latest\/index.html","Q_Score":4,"Tags":"python,rest,celery","A_Id":58300556,"CreationDate":"2018-04-02T08:53:00.000","Title":"Celery REST API","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Django currently has a complete system for routing urls.\nBut I have a very specific situation where I am using django but actually need to use urls like in classic PHP language.\nFor example:\nThe url - localhost\/reader\/theeffort  should take me to a folder called theeffort where I have my files index.html, 1.html, 2.html, 3.html\nand so on!\nNow all these files should be accessible by localhost\/reader\/theeffort\/*.html and not by Django's default url system. Is this possible to achieve that? If yes, how?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":102,"Q_Id":49610673,"Users Score":1,"Answer":"This isn't a thing you would do with Django's URLs. If you just want to serve HTML files within a folder, they are static files; they should therefore be served by the web server itself, eg Apache. You just need to configure an alias in the Apache conf to point to the folder where the static files are.","Q_Score":0,"Tags":"python,php,django,url","A_Id":49611215,"CreationDate":"2018-04-02T11:45:00.000","Title":"Redirect to a folder in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Happy Easter to y'all!\nSo my problem is essentially using SQL timestamp is causing me some issues. I have a Travel Booking website with a database made in PHPmyadmin and as mentioned two timestamp columns (one for departure time and one for arrival.) If there are times currently there for the journey they will be displayed, if not a tick box to set the current time as the timestamp, this i'm fine with. \nI don't know what html form element to use to display the entirety of the SQL timestamp, both the date and time section in the html form (or how to validate any of it xD) I have tried splitting the timestamp and displaying it in both a date and time field but had no luck and was told to stick to the timestamp by my group members. Cheers","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":48,"Q_Id":49612023,"Users Score":1,"Answer":"Solved the problem with some troubleshooting. The formatting difference between datetime-local and timestamp can be solved with some simple regex. \nVariableName = re.sub(r\"\\s+\", 'T', VariableName) \nSwaps any whitespace characters with a T. \nThis is because datetime-local likes to concatenates the date and time together using a capital T. If we simulate this using the regex above we can convert the timestamp into a readable format.","Q_Score":0,"Tags":"python,html,sql","A_Id":49677529,"CreationDate":"2018-04-02T13:14:00.000","Title":"Exchanging Information between HTML Form and SQL Database","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Queryset.objects.all() return all objects and also,\nQueryset.objects.filter() return all objects too.\nI have two query that use Queryset.objects.filter() and i want to use it for return all objects.\nQuestion: Are both Queryset.objects.all() and Queryset.objects.filter() performance the same?","AnswerCount":2,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":8836,"Q_Id":49630802,"Users Score":11,"Answer":"Yes, both will perform the same in a database point of view once you are not passing any arguments on the filter. The filter will execute more processing steps, once it needs to check if you passed arguments or not, but the difference will be very little.\nIn this case, I suppose you should use the all() instead of filter just to make your code more clear about what are you doing.","Q_Score":11,"Tags":"python,django","A_Id":49630961,"CreationDate":"2018-04-03T13:02:00.000","Title":"django objects.all() vs objects.filter()","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"By default django creates a test database when running tests which raises some inconvenience for me:\nThe API that i am writing test for uses a database. When i run the test, a new database is created, some dummy data is being inserted into the test database and a http post request is being sent to the API under test. What happens is that my API under test does not see inserted data.\nWith the problem explained, what are the right solutions \/ best practices for testing APIs with databases ?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":35,"Q_Id":49633359,"Users Score":0,"Answer":"I'm assuming you're doing REST service, preferably with Django Rest Framework (DRF). If not, look it up.\nThe correct approach to testing your own API is:\n\nCreate a class which inherits APITestCase.\nCreate a test function in the class, for example: test_my_thing(self):\nUse the django 'reverse' function to generate the URL to your tested API.\nUse self.client.get, self.client.post, self.client.delete and store the response in a variable.\nresponse.json() gives you the response body in a json format\nAssert the response.","Q_Score":1,"Tags":"python,django,python-3.x,unit-testing,python-unittest","A_Id":49633839,"CreationDate":"2018-04-03T15:05:00.000","Title":"Django unittesting different databases for api and for test","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am fairly new to Django and could not figure out by reading the docs or by looking at existing questions. I looked into Django permissions and authentication but could not find a solution.\nLet's say I have a Detail View listing all instances of a Model called Item. For each Item, I want to control which User can view it, and for how long. In other words, for each User having access to the Item, I want the right\/permission to view it to expire after a specified period of time. After that period of time, the Item would disapear from the list and the User could not access the url detailing the Item.\nThe logic to implement is pretty simple, I know, but the \"per user \/ per object\" part confuses me. Help would be much appreciated!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":469,"Q_Id":49637924,"Users Score":1,"Answer":"Information about UserItemExpiryDate has to be stored in a separate table (Model). I would recommend using your coding in Django. \nThere are few scenarios to consider: \n1) A new user is created, and he\/she should have access to items. \nIn this case, you add entries to UserItemExpiry with new User<>Item combination (as key) and expiry date. Then, for logged in user you look for items from Items that has User<>Item in UserItemExpiry in the future. \n2) A new item is created, and it has to be added to existing users. \nIn such case, you add entries to UserItemExpiry with ALL users<> new Item combination (as key) and expiry date. And logic for \"selecting\" valid items is the same as in point 1. \nBest of luck, \nRadek Szwarc","Q_Score":1,"Tags":"python,django,django-admin,django-authentication,django-permissions","A_Id":49638105,"CreationDate":"2018-04-03T19:38:00.000","Title":"Django : how to give user\/group permission to view model instances for a specified period of time","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have rather unusual task, so I would like to ask for a piece of advice from experts :) \nI need to build small Flask-based web which will have build-in video player. Users will have to log-in to access videos. The problem is that I need to limit user by the amount of time they can spend using the service.\nCould someone please recommend a possible way to make it work or help me to find a place to get started?\nWhat I am thinking of... what if i create user's profile variable like \"credits_minutes\", and i could find a way to decrease credits_minutes every minute by one?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1049,"Q_Id":49645765,"Users Score":2,"Answer":"The sessions are based on requests from my understanding what you are trying to do is to actually get the amount of time spent on the site? You'll need to do some kind of keep alive from the client.\nSuch as web sockets, repetitive JavaScript calls or something else to know that they are on the actual site and base you logic on that.\nA simple solution would be to write something with jquery that polls an endpoint of you choice where you could do something time based for each poll. Such as saving the oldest call and comparing it to each new that is arriving. and when X minutes has elapsed, redirect the user.","Q_Score":1,"Tags":"python,session,web,flask,limit","A_Id":49646144,"CreationDate":"2018-04-04T08:02:00.000","Title":"Flask limiting user sessions by time","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have installed bs4 using\npip install bs4\nI run pip list and beautifulsoup4 (4.6.0) bs4 (0.0.1) both appear. \nbut when I run python from the command line I get \nimport bs4\nImportError: No module named bs4\nI'm new to python so any help would be great.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":73,"Q_Id":49646758,"Users Score":0,"Answer":"im guessing that you are trying to import like this:\nimport bs4\ntry this line instead\nfrom bs4 import BeautifulSoup","Q_Score":0,"Tags":"python,python-2.7,beautifulsoup","A_Id":49647971,"CreationDate":"2018-04-04T08:55:00.000","Title":"Beautiful Soup 4","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm upgrading an old project running on Django 1.8 to at least Django 1.11 for LTS. I've heard upgrading a django project multiple versions can be difficult and frustrating. I haven't done this, so my question; is it better to do an upgrade per version, 1.8 -> 1.9 -> 1.10 -> 1.11. Or do you advice me to upgrade straightaway to 1.11 from 1.8. Please leave your best thoughts on this and other things I need to keep in mind while upgrading.\nThanks in advance","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":3005,"Q_Id":49652893,"Users Score":1,"Answer":"Is not that far away from 1.8 to 1.11. I have updated versions like this before and I rarely ever had a problem. Usuary the problems that I had wasn't related to Django at all most of the time was because some libraries that were being used in the project that required to be updated as well as we update Django","Q_Score":9,"Tags":"python,django,upgrade,django-1.8,django-1.11","A_Id":49653185,"CreationDate":"2018-04-04T13:54:00.000","Title":"How to upgrade django project multiple versions (1.8 to 1.11+)?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm upgrading an old project running on Django 1.8 to at least Django 1.11 for LTS. I've heard upgrading a django project multiple versions can be difficult and frustrating. I haven't done this, so my question; is it better to do an upgrade per version, 1.8 -> 1.9 -> 1.10 -> 1.11. Or do you advice me to upgrade straightaway to 1.11 from 1.8. Please leave your best thoughts on this and other things I need to keep in mind while upgrading.\nThanks in advance","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":3005,"Q_Id":49652893,"Users Score":4,"Answer":"The upgrade can be difficult, depends on your situation.\nFirst, check the changelog for every version. The goal here is to understand if there is a major change that can affect your code. For example, the on_delete parameter in the foreign field models was optional, now is mandatory.\nIf you spot something, just update your code. \nWhat can really make the differences are the presence of tests. When we move from python2 to python3 and django 1.7 to 1.11 the tests were our insurance. \nWe just start to upgrade our code to a different branch using the virtualenv with the new python and new django and just fixing, testing and then merging in develop. If you don't have tests maybe is the right time to write some of them.\nI would not suggest you jump directly to django 2.0. Again, if you have tests you can update gradually and then check the deprecation warnings. Those are very helpful to prepare your code for the next version.\nUpdate\nDuring the process, we check our requirements and revise every package we had in our system to verify the compatibility. We clean up a little bit removing some packages and update some others. Again, if you have tests you have your insurance :-)\nConclusion\n\nCheck the changelogs\nUse a separate branch\n\nThen:\n\nUpdate gradually ( e.g. from 1.7 to 1.8)\n(write and) Run tests\nUpdate your code\/packages\nRun tests\nIf all it's ok then merge back\nin develop\nbranch again and go back to 1","Q_Score":9,"Tags":"python,django,upgrade,django-1.8,django-1.11","A_Id":49653287,"CreationDate":"2018-04-04T13:54:00.000","Title":"How to upgrade django project multiple versions (1.8 to 1.11+)?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to know that if I can make a web server with Flask in my pc like xampp apache (php) for after I can access this page in others places across the internet. Or even in my local network trough the wifi connection or lan ethernet. Is it possible ? I saw some ways to do this, like using \"uwsgi\".. something like this... but I colud never do it.\nOBS: I have a complete application in Flask already complete, with databases and all things working. The only problem is that I don't know how to start the server and access by the others pc's.","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":5337,"Q_Id":49656877,"Users Score":2,"Answer":"Yes, you can.\nJust like you said, you can use uwsgi to run your site efficiently. There are other web servers like uwsgi: I usually use Gunicorn. But note that Flask can run without any of these, it will simply be less efficient (but if it is just for you then it should not be a problem).\nYou can find tutorials on the net with a few keywords like \"serving flask app\".\nIf you want to access your site from the internet (outside of your local network), you will need to configure your firewall and router\/modem to accept connections on port 80 (HTTP) or 443 (HTTPS).\nGood luck :)","Q_Score":2,"Tags":"python,html,web,flask","A_Id":49656968,"CreationDate":"2018-04-04T17:20:00.000","Title":"make a web server in localhost with flask","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My website is hosted on Google App Engine using Standard Python.\nIn request handlers, I am setting HTTP header \"cache-control: max-age=3600, public\"\nSo frontend server \"Google Frontend\" caches the response for 1hr(which I want to save cost).\nIn rare cases the content of page changes and I want the content in frontend cache to be invalidated. How can I do that?\nIs there any API for it?\nI can't alter the URL as they have 90% traffic from Google Search.","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":130,"Q_Id":49658369,"Users Score":2,"Answer":"When you set cache-control via the header or meta tag, that tells the browser to store the response.  So, the next time, it will not even ping your server.  This means that you cannot invalidate that cache after set.\nWhat you need is a backend cache. Frameworks like Django, Flask, etc. make this easy.  You can set a template cache, so it responds quickly, without much processing.\nYou can store the response in GAE's memcache, and send from there.  You can easily invalidate that cache, because you have complete control over it.\nAlternatively, you could change the url.  Google reads your canonical meta tag to get the desired indexed url, so you can add a query string, etc., but still save the Google score to that indexed url.","Q_Score":0,"Tags":"python,google-app-engine","A_Id":49659939,"CreationDate":"2018-04-04T18:53:00.000","Title":"How to invalidate cashed URL response from GAE \"server: Google Frontend\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm having a problem with elastic beanstalk, in my application there is some piece of code that creates some files dynamically and now I want to persist these files for future use, so is there any way that I can push my dynamically created files to GitHub automatically, so in next deployment these changes will remain, as elastic beanstalk replace the old code with new code after each deployment, So How can I commit my changes and push them to GitHub repo from code, any suggestions?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":120,"Q_Id":49670491,"Users Score":1,"Answer":"You can user aws S3 or other storage service as file back-end. This will sole you problem.","Q_Score":0,"Tags":"python,django,amazon-web-services,deployment,amazon-elastic-beanstalk","A_Id":49670735,"CreationDate":"2018-04-05T10:47:00.000","Title":"Auto Deploy Elastic Beanstalk Changes","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a problem with multilanguage and multi character encoded text. \nProject use OpenGraph and it will save in mysql database some information from websites. But database have problem with character encoding. I tryed encoding them  to byte. That is problem, becouse in admin panel text show us bute and it is not readable. \nPlease help me. How can i save multilanguage text in database and if i need encode to byte them how can i correctly decode them in admin panel and in views","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":89,"Q_Id":49672291,"Users Score":0,"Answer":"You should encode all data as UTF-8 which is unicode.","Q_Score":0,"Tags":"python,django","A_Id":49672440,"CreationDate":"2018-04-05T12:22:00.000","Title":"Django multilanguage text and saving it on mysql","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a twisted web server with static files served in an htdocs\/... hierarchy. I would like to pass all .template files to mako\/jinja before returning them, but return non-templated static files directly. Does anyone have any insight on the best way to do this? I would like to avoid having to put them in a specific directory instead I would like to leave them in the natural file hierarchy.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":39,"Q_Id":49679102,"Users Score":0,"Answer":"I attempted to use a file processor, but in the end I ended up subclassing static.File and overriding the render() method. The only complication was that I didn't realize that my type (MakoFile) would be instantiated for each child - this was causing me to lose my local mako context at times. In the end I realize the each instance of the File class has a Registry() handed down.\nSo I subclassed Registry as MakoRegistry, stuck my template lookup and context in there and pushed it into the top level object. This is working so far.","Q_Score":0,"Tags":"python,django-templates,webserver,jinja2,twisted","A_Id":49933007,"CreationDate":"2018-04-05T18:27:00.000","Title":"Custom filename extension handler in Twisted webserver for template rendering","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In my framework, I am exposing a method to user which raises a custom exception and handling it in framework if raised.\nBut user has used generic catch block (Exception or except) while using my method, thus it is not handled as expected.\nIs there any way I can solve this issue either by ,\ni) Making my custom exception bypass generic except block (or get caught only by my custom except block).\nii) get the flow back to test_driver directly when condition is encountered.\nNote: I can not restrict user to using generic catch block.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":409,"Q_Id":49691232,"Users Score":0,"Answer":"No, there is no way to bypass a try ... except. Every exception that can be thrown can also be caught with an except. That's the whole point of exception handling.\nTrying to bypass an exception handler is not the correct solution. If your user catches your exception, there's nothing you can do about it. Look at it this way: The user caught an exception that he wasn't supposed to catch. This is a bug in the user's code. The correct way to deal with bugs is to fix them, not try to bypass them. It's not your responsibility to do anything about this problem - it's the user's responsibility to fix that bug.","Q_Score":0,"Tags":"python,python-2.7,exception,exception-handling","A_Id":49691671,"CreationDate":"2018-04-06T10:59:00.000","Title":"Bypass Base or Generic exception","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm scrapping data from a subsection of Amazon. I want to be able to detect when a product is no longer available if I have previously scrapped that product. Is there a way to deal with outdated data like this? \nThe only solution I can think of so far is to completely purge the data and start the scrapping over but this will cause the metadata assigned to these items to be lost. My only other solution I can think of is an ad-hoc comparison of the two scrappings.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":27,"Q_Id":49701840,"Users Score":0,"Answer":"How are you storing the data after each run?\nYou might consider just checking the for existence of a buy button on subsequent scrapings and marking a flag on the item as unavailable.","Q_Score":0,"Tags":"python,web-scraping,scrapy","A_Id":49702055,"CreationDate":"2018-04-06T22:31:00.000","Title":"Dealing with old records in Scrapy?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"One thing I like about Rails projects is that you can create test content and place them in seeds.rb and seed them into the database by running rake db:seed instead of having to feed them one by one directly.\nIs there something similar for Python\/Django?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":1058,"Q_Id":49702512,"Users Score":1,"Answer":"I would also recommend looking at Factory Boy for test data creation. One could create records in series of loops to population any number of tables and build sensible relationships between records.","Q_Score":4,"Tags":"python,django,python-3.x","A_Id":50101450,"CreationDate":"2018-04-07T00:08:00.000","Title":"Does Django have an equivalent of Rails's \u201crails db:seed\u201d?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am doing a project that requires me to repeatedly run a java function in python (it's like designing a learning algorithm in python but the value function was provided in java)\nSo what would be the practice for this scenario? Shall I use subprocess.run() to call the java function every time or shall I use the things like Py4J, Jython or JPype? What's the difference between using subprocess.run() and the others?\nThe efficiency should be the top concern since I need to run the same java function repeatedly.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":784,"Q_Id":49704105,"Users Score":3,"Answer":"Using subprocess has two problems. If neither one is relevant, it'll work fine.\n\n\nIf you're sending large amounts of data back and forth, you have to serialize it in some format to pass in via files and command-line arguments, or pipes or sockets, which can be slow.\nIf you're calling a whole lot of short functions instead of one occasional huge one, you'll be spending more time setting up and tearing down the JVM (and warming up the JIT) than doing actual work.\n\nJython has two problems. Again, if neither one affects you, it'll work fine.\n\n\nIt can't use many popular third-party libraries because they're built in C, for CPython.\nIt's out of date. The latest version implements Python 2.7, which is less than 2 years away from going out of support.\n\nJPype has one problem, but it's a doozy. If the current fork does what you need and has no bugs blocking you, maybe it's ok anyway.\n\n\nIt's a vaporware project abandoned over a decade ago. It was picked up and knocked into shape by someone else a few years ago, and the current maintainer is keeping it running, and occasionally gets patches for things like working in 64-bit cygwin or updating to OS X 10.9, but it's not exactly a vibrant project with major support behind it.\n\nPy4J has two problems.\n\n\nIt's incomplete. Not unusuable, and not completely moribund, but there hasn't been any visible work on it in over a year, and nobody seems interested in anything but the minimal functionality needed for Apache Spark.\nIt's doing the same kind of serialization you'd do with subprocess behind your back, and more beyond that for every call you make, and the FAQ justifies this by saying performance is not a priority. (Spark just ignores all of that and uses its own channels for everything.)\nFor more minimal use\u2014just starting up a JVM and setting up a socket to it\u2014it may be better than subprocess because you don't have to keep starting and tearing down a JVM, but writing a socket protocol on both sides is a little bit more work than storing files and passing filenames on the command line. (Not a huge hurdle, but a problem if you've never done this kind of thing before.)\n\nYou may also want to look at transpilers. I don't know much about any of them, but I've talked to people who are using BeeWare to compile Python 3.4 code to Java source code that they then build together with their native Java code. I'm pretty sure this won't work if you're using any C extension, but if that's not a problem for you, it might be worth considering.","Q_Score":0,"Tags":"java,python,subprocess,jython,jpype","A_Id":49704196,"CreationDate":"2018-04-07T05:12:00.000","Title":"What is the best way to run the same java function repeatedly in python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am scraping a list of products every day using Scrapy but the products do not have unique ID numbers. So I have tried to manually assign 1,2,3,4 in the CSV file but this is not working since the products are changing from 1 to 5 for example if the site changes. Do you have any other solution that you can think so when I upload to my database the products will not duplicate?\nAlso, is there a way to ask Scrapy to automatically add 1,2,3,4 automatically?\nCheers.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":430,"Q_Id":49704710,"Users Score":0,"Answer":"If you are running on Scrapinghub Cloud, you can call the API to get the latest job ID when running, and the ID will be unique for the job.","Q_Score":0,"Tags":"python,scrapy,scrapy-spider","A_Id":54697103,"CreationDate":"2018-04-07T06:45:00.000","Title":"Scrapy - adding an unique ID to scraped data","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working on a web app project and I'm trying to use python and java, I get some problem with\n\nHow to communicate between java and python.  \n\nFor example, How a python project exchange data with java project, How to communicate between these two independent project. What should be use for sending result from python to java?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":92,"Q_Id":49704985,"Users Score":1,"Answer":"you can use files to write from one language and read from another language .\nuse sockets or use  http request  to communicate with each program.","Q_Score":0,"Tags":"java,python-2.7","A_Id":49705069,"CreationDate":"2018-04-07T07:24:00.000","Title":"How to send and receive result using Java and Python Project?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to download the last 24hours of new files added to an S3 bucket - however, the S3 bucket contains a large number of files.\nFrom my understanding s3 buckets use a flat structure where files are stored alphabetically based on the key name. \nI've written a script to pull all the data stored on the bucket using threading. However, now I have all the files on my local system I want to update the database every 24hours with any new files that have been uploaded to S3. \nMost forums recommend using 'last modified' to search for the correct files and then download the files that match the data specified.\nFirstly, does downloading a file from the s3 bucket change the 'last modified'? Seems like this could cause problems.\nSecondly, this seems like a really in-efficient process - searching through the entire bucket for files with the correct 'last modified' each time, then downloading... especially since the bucket contains a huge number of files. Is there a better way to achieve this?\nFinally, does the pre-fix filter make this process any more efficient? or does this also require searching through all files.\nThanks in advance!","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":1708,"Q_Id":49710898,"Users Score":1,"Answer":"I'm going to go a different direction with this answer... You're right, that process is inefficient. I'm not sure the quantities and size of data you're dealing with but you're basically talking that you need a batch job to download new files. Searching a large number of keys is the wrong way to do it and is kind of an anti-pattern in AWS. At the root you need to keep track of new files as they come in.\nThe best way to solve this is using a Lambda Function (python since you're already familiar) that is triggered when a new object is deposited in your S3 bucket. What does that function do when a new file comes in?\nIf I had to solve this I would do one of the following:\n\nAdd the key of the new file to a DynamoDB table along with the timestamp. Throughout the day that table will grow whenever a new file comes in. When you're running your batch job read the contents of that table and download all the keys referenced, remove the row from the DynamoDB table. If you wanted to get fancy you could query based on the timestamp column and never clear rows from the table.\nCopy the file to a second \"pickup\" bucket. When your batch job runs you just read all the files out of this pickup bucket and delete them. You have to be careful with this one. It's really easy but you have to consider the size\/quantity of the files you're depositing so you don't run into the Lambda 5min execution limit.\n\nI can't really recommend one over the other because I'm not familiar with your scale, cost appetite, etc. For a typical use case I would probably go with the DynamoDB table solution. I think you'll be surprised how easy DynamoDB is to interact with in Python3.","Q_Score":0,"Tags":"python-3.x,amazon-web-services,amazon-s3,boto3","A_Id":49711565,"CreationDate":"2018-04-07T18:57:00.000","Title":"Efficiently downloading files from S3 periodically using python boto3","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to download the last 24hours of new files added to an S3 bucket - however, the S3 bucket contains a large number of files.\nFrom my understanding s3 buckets use a flat structure where files are stored alphabetically based on the key name. \nI've written a script to pull all the data stored on the bucket using threading. However, now I have all the files on my local system I want to update the database every 24hours with any new files that have been uploaded to S3. \nMost forums recommend using 'last modified' to search for the correct files and then download the files that match the data specified.\nFirstly, does downloading a file from the s3 bucket change the 'last modified'? Seems like this could cause problems.\nSecondly, this seems like a really in-efficient process - searching through the entire bucket for files with the correct 'last modified' each time, then downloading... especially since the bucket contains a huge number of files. Is there a better way to achieve this?\nFinally, does the pre-fix filter make this process any more efficient? or does this also require searching through all files.\nThanks in advance!","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":1708,"Q_Id":49710898,"Users Score":1,"Answer":"Another solution to add here..\nYou could enable inventory on S3 which gives you a daily report of all files in the bucket, including meta data such as date in CSV format. \nWhen the CSV is generated (first one can take 48hours) you are able to generate a list of new files that you can download accordingly. The dynamo lambda option mentioned before will definitely give you a more real-time solution. \nAlso, I think modified date is only affected by PUT and POST actions","Q_Score":0,"Tags":"python-3.x,amazon-web-services,amazon-s3,boto3","A_Id":49712138,"CreationDate":"2018-04-07T18:57:00.000","Title":"Efficiently downloading files from S3 periodically using python boto3","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In Odoo (openERP) the default behavior for Tree view to list all items with pagination.\nIs there any possible way to not list any records by default and list when searched through search-bar or advanced search?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":601,"Q_Id":49724220,"Users Score":1,"Answer":"You can do this by creating wizard and then after closing that wizard you can get all your data. Create a menu, in its action just give a view id of your wizard. From wizard get all argument from user and then after successfully getting that data generate dynamic view from py.","Q_Score":3,"Tags":"python,xml,odoo","A_Id":49726437,"CreationDate":"2018-04-09T00:47:00.000","Title":"Don't display all record by default in odoo tree view","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Where can I find the list of all possible options\/values I can assign to this property ?\nSo far I only found people using: \"status:m\"\nfilterPanel.InteractiveSearchPattern = \"status:m\"","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":169,"Q_Id":49727576,"Users Score":1,"Answer":"great question!\nuhhhhhh I don't think there's a list though :)\nI did some digging through our support DB and found the following info. I have not had a chance to test these to validate.\n\nInteractiveSearchPattern can be set to the name of a filter to find, well, that specific filter (or a partial filter name to match multiple filters)\nstatus:m is abbreviated from status:modified, and will return a list of all modified filters\ndatatable:MyTable should match all filters from a given data table\n* should match all columns (unclear if this is regex matching or not)\n\nI inquired about this to TIBCO support, so if there are any additional points to list I'll make sure to update the answer :)","Q_Score":2,"Tags":"ironpython,spotfire","A_Id":49739825,"CreationDate":"2018-04-09T07:26:00.000","Title":"FilterPanel. InteractiveSearchPattern - list of possible values","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"while I am trying to update value that affect computed field I got this error:\n\nOdoo Server Error\n  Traceback (most recent call last):\n    File \"\/Users\/abdalla\/projects\/greenway\/odoo-server\/openerp\/http.py\", line 647, in _handle_exception\n      return super(JsonRequest, self)._handle_exception(exception)\n    File \"\/Users\/abdalla\/projects\/greenway\/odoo-server\/openerp\/http.py\", line 684, in dispatch\n      result = self._call_function(**self.params)\n    File \"\/Users\/abdalla\/projects\/greenway\/odoo-server\/openerp\/http.py\", line 320, in _call_function\n      return checked_call(self.db, *args, **kwargs)\n    File \"\/Users\/abdalla\/projects\/greenway\/odoo-server\/openerp\/service\/model.py\", line 118, in wrapper\n      return f(dbname, *args, **kwargs)\n    File \"\/Users\/abdalla\/projects\/greenway\/odoo-server\/openerp\/http.py\", line 313, in checked_call\n      result = self.endpoint(*a, **kw)\n    File \"\/Users\/abdalla\/projects\/greenway\/odoo-server\/openerp\/http.py\", line 963, in call\n      return self.method(*args, **kw)\n    File \"\/Users\/abdalla\/projects\/greenway\/odoo-server\/openerp\/http.py\", line 513, in response_wrap\n      response = f(*args, **kw)\n    File \"\/Users\/abdalla\/projects\/greenway\/odoo-server\/addons\/web\/controllers\/main.py\", line 904, in call_kw\n      return self._call_kw(model, method, args, kwargs)\n    File \"\/Users\/abdalla\/projects\/greenway\/odoo-server\/addons\/web\/controllers\/main.py\", line 896, in _call_kw\n      return getattr(request.registry.get(model), method)(request.cr, request.uid, *args, **kwargs)\n    File \"\/Users\/abdalla\/projects\/greenway\/odoo-server\/openerp\/api.py\", line 250, in wrapper\n      return old_api(self, *args, **kwargs)\n    File \"\/Users\/abdalla\/projects\/greenway\/odoo-server\/openerp\/api.py\", line 381, in old_api\n      result = method(recs, *args, **kwargs)\n    File \"\/Users\/abdalla\/projects\/greenway\/odoo-server\/openerp\/models.py\", line 6036, in onchange\n      record.mapped(field_seq)\n    File \"\/Users\/abdalla\/projects\/greenway\/odoo-server\/openerp\/models.py\", line 5534, in mapped\n      recs = recs._mapped_func(operator.itemgetter(name))\n    File \"\/Users\/abdalla\/projects\/greenway\/odoo-server\/openerp\/models.py\", line 5514, in _mapped_func\n      vals = [func(rec) for rec in self]\n    File \"\/Users\/abdalla\/projects\/greenway\/odoo-server\/openerp\/models.py\", line 5752, in getitem\n      return self._fields[key].get(self, type(self))\n    File \"\/Users\/abdalla\/projects\/greenway\/odoo-server\/openerp\/fields.py\", line 829, in get\n      self.determine_value(record)\n    File \"\/Users\/abdalla\/projects\/greenway\/odoo-server\/openerp\/fields.py\", line 927, in determine_value\n      record._prefetch_field(self)\n    File \"\/Users\/abdalla\/projects\/greenway\/odoo-server\/openerp\/api.py\", line 248, in wrapper\n      return new_api(self, *args, **kwargs)\n    File \"\/Users\/abdalla\/projects\/greenway\/odoo-server\/openerp\/models.py\", line 3295, in _prefetch_field\n      assert self in records and field in fs\n  AssertionError","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":435,"Q_Id":49729015,"Users Score":0,"Answer":"finally I found the problem:\nthe problem is that the method of the computed field is not exist (I renamed it accidentally). so when odoo try to get the value of this field it failed, and show this strange error","Q_Score":0,"Tags":"python,odoo-8,odoo-10,odoo-9","A_Id":49730003,"CreationDate":"2018-04-09T08:53:00.000","Title":"odoo 9 AssertionError assert self in records and field in fs","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was wondering what others are doing to expose REST api endpoints with the datastore (using app engine standard). I want to use urlsafe keys but 1 - I'd rather not pass this data directly as it poses a security risk since app-engine to app-engine calls are exposed over a public ip, and 2 - the keys that are generated are very long and would not be great when multiple need to be passed as a query parameter to form a get request (and would probably exceed browser character limits).\nI was thinking maybe using compression of some sort to compress the urlsafe keys which would solve both 1 and 2, but want to see if there is a better way to create REST endpoints. Or if some type of compression method is already baked into ndb?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":90,"Q_Id":49737087,"Users Score":1,"Answer":"Google uses HTTPS internally so I'm not sure you need to worry about it.  \nAlso, you should probably design your app so that keys are not secret info and such that it is safe to expose them.\nI use key IDs for my REST calls, which I believe are 12 digit numbers.  That works as long as you know the entity type.  If you need to specify the entity type, you could add another parameter to your API call.","Q_Score":0,"Tags":"rest,google-app-engine,google-cloud-datastore,app-engine-ndb,google-app-engine-python","A_Id":49739232,"CreationDate":"2018-04-09T16:01:00.000","Title":"NDB urlsafe keys and REST api requests","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Background:\nI am using Django2 and Sentry for detecting my crash. In my gitlab pipe line. I used to has test job as a major concern to not break any features when deploy new feature.\nMany of my testcases contains Exception and Sentry does surge up.\nQuestion:\nDo I have any technique to suppress sentry for a while during pipeline running?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":19,"Q_Id":49771711,"Users Score":1,"Answer":"Well basically if there is a settings.py configuration that specify whether to send errors to Sentry, you could create a different one for test environment and turn off sentry logging.\nI currently use a separate test_settings.py file where I remove sentry (and related) from the INSTALLED_APPS. It works well enough for us.","Q_Score":0,"Tags":"python,sentry","A_Id":49841595,"CreationDate":"2018-04-11T09:42:00.000","Title":"Crash analytic surge up when runner running testcases","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I randomly encounter the same error whenever I run XGBoost model (both the normal run and grid search). The error message says this:\nH2OConnectionError: Local server has died unexpectedly. RIP.\nI don't know what happens, I tried to change versions but didn't work. I'm currently using the version 3.18.0.5. Does anyone have any idea what is happening? Thanks in advance","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":959,"Q_Id":49773582,"Users Score":1,"Answer":"The only time I've seen this happen is when H2O runs out of memory.  Please check that you have enough memory -- an H2O cluster should have at least 4x the amount of RAM as the dataset you're trying to train a model on (data size on disk).","Q_Score":4,"Tags":"python,machine-learning,artificial-intelligence,h2o,xgboost","A_Id":51889351,"CreationDate":"2018-04-11T11:11:00.000","Title":"Error every time running H2OXGBoostEstimator","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Basically I downloaded django project from SCM, Usually I run the project with with these steps\n\ngit clone repository\nextract\nchange directory to project folder\npython manage.py runserver \n\nBut this project does not contains manage.py , how to run this project in my local machine???\nbr","AnswerCount":4,"Available Count":1,"Score":0.2449186624,"is_accepted":false,"ViewCount":4321,"Q_Id":49775020,"Users Score":5,"Answer":"Most likely, this is not supposed to be a complete project, but a plugin application. You should create your own project in the normal way with django-admin.py startproject and add the downloaded app to INSTALLED_APPS.","Q_Score":1,"Tags":"python,django","A_Id":49775359,"CreationDate":"2018-04-11T12:21:00.000","Title":"How to run a django project without manage.py","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working on a some automation work, as per my requirement I need to click on Chrome Physical buttons like left nav, right nav, bookmarks, menu etc. I can do with shortcuts but my requirement is to click on browser buttons. Any ideas would be helpful. Thanks in advance.","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1530,"Q_Id":49799864,"Users Score":0,"Answer":"This can't be done with selenium webdriver and I think also not with the standalone selenium server. Selenium only allows to interact with the DOM.\nThe only way to achieve what you want to do is to use an automation tool that actually runs directly in the OS that you use. Java can be used to write such a program.\nI would however recommend to not go this route. Instead try to convince whoever is responsible for your requirements to re-think and allow to use other means of achieving back and forward actions.","Q_Score":0,"Tags":"java,python,google-chrome,selenium,selenium-chromedriver","A_Id":49800000,"CreationDate":"2018-04-12T15:00:00.000","Title":"Selenium click chrome physical buttons like menu, left, right navigation, bookmarks","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I would highly appreciate any help on this. I'm constructing dynamic highcharts at the backend and would like to send the data along with html to the frontend. \nIn highcharts, there is a specific field to accept Date such as:\nx:Date.UTC(2018,01,01)\nor x:2018-01-01. However, when I send dates from the backend, it is always surrounded by quotes,so it becomes: x:'Date.UTC(2018,01,01)'\nand x:'2018-01-01', which does not render the chart. Any suggestions on how to escape these quotes?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":49,"Q_Id":49804663,"Users Score":0,"Answer":"Highcharts expects the values on datetime axes to be timestamps (number of miliseconds from 01.01.1970). Date.UTC is a JS function that returns a timestamp as Number. Values surrounded by apostrophes are Strings.\nI'd rather suggest to return a timestamp as a String from backend (e.g. '1514764800000') and then convert it to Number in JS (you can use parseInt function for that.)","Q_Score":0,"Tags":"python,jquery,web,highcharts,web.py","A_Id":49812323,"CreationDate":"2018-04-12T19:41:00.000","Title":"Send data from Python backend to Highcharts while escaping quotes for date","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was trying to use the new liberary request-html.\nBut when i use the render() function to parse a javascript page, it always pop up with the notes as below:\n\nError in atexit._run_exitfuncs: Traceback (most recent call last):\n  File \"C:\\Program Files\n  (x86)\\Python36-32\\lib\\site-packages\\pyppeteer\\launcher.py\", line 201,\n  in killChrome\n      self._cleanup_tmp_user_data_dir()   File \"C:\\Program Files (x86)\\Python36-32\\lib\\site-packages\\pyppeteer\\launcher.py\", line 130,\n  in _cleanup_tmp_user_data_dir\n      raise IOError('Unable to remove Temporary User Data') OSError: Unable to remove Temporary User Data\n\nI tried to solve the problems, but it seems that there is no solution right now. So i kind of hope someone here can help me. \nPS: it seems that i can not post it with the tag:requests-html, i do not have enought repution. So, very sorry for that.","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2313,"Q_Id":49809600,"Users Score":0,"Answer":"I fixed this issue by switch to the administrator mode.","Q_Score":4,"Tags":"javascript,python,request,render","A_Id":54684002,"CreationDate":"2018-04-13T04:59:00.000","Title":"IOError happened while use requests-html to render a javascript page","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to extract mimetype with magic number from iWork suite.\nHow do? Exiftool see \".pages\" etc. as \"application\/zip\". But the real mimetype isn't this. \nHow can i extract the correct mime?\nI can use an validation with python tool if needed. \n\"Apline for docker\".\nThanks for help.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":283,"Q_Id":49814102,"Users Score":0,"Answer":"Phil Harvey has \"Improved identification of Apple iWork files\" in exiftool version 10.96.  Check to see if that works for you.","Q_Score":0,"Tags":"python,alpine,exiftool,iwork","A_Id":50262989,"CreationDate":"2018-04-13T09:51:00.000","Title":"How extract iWorks suite mimetype with Exiftool","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a website on AppEngine that is 99% static. It is running on Python 2.7 runtime. Now the time has come to evolve this webapp, and since I have almost none Python code in it, I'd prefer to write it in Go instead.\nCan I change runtime from Python 2.7 to Go, while keeping the project intact? Specifically, I want to keep the same app-ID, the same custom domain attached to it, the same SSL certificate, and so on. \nWhat do I have to do in order to do that? I surely have to change runtime in the app.yaml. Is there anything else?\nBonus question: will such change happen without a downtime?\nI'd be grateful for any links to documentation on exactly that (swapping runtime on a live app). I can't find any.","AnswerCount":2,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":562,"Q_Id":49831512,"Users Score":4,"Answer":"Specify a runtime as well as a new value for version.  When deployed you'll have an older version that is Python and a newer version that is Go.  There won't be any downtime (same as when deploying a newer version of Python).\nRather than trusting links\/docs (that may be out of date or not 100% exactly what you're trying to do), why not create a new GAE-Std project for testing purposes and try it yourself.  Having a GAE-Std test project is good for testing new function (especially by other testers who won't have access to the dev environ on your laptop).","Q_Score":2,"Tags":"google-app-engine,google-app-engine-python,google-app-engine-go","A_Id":49832513,"CreationDate":"2018-04-14T12:34:00.000","Title":"Change runtime from Python to Go in App Engine standard environment","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm working on a project on pythonanywhere.com and my code in Python (with Flask framework) manages requests of an Android app that wants to access the MySQL database.\nThe point is that I would like a notification to arrive on the Android smartphone when a row is added to a database table.\nIf I understand correctly, from Python to Android I can use Firebase Cloud Messaging, but I'm not sure what to use from MySQL to Python: a trigger that calls a script that will send the notification? Or Python listening to the database? Or what else?\nRemember that I'm not using personal servers and databases but those offered by the above mentioned domain so I'm not sure I can use everything I want (for example, if I'm not mistaken, it is not possible to implore a UDF).\nThanks in advance!","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":862,"Q_Id":49833921,"Users Score":1,"Answer":"Where is the row added from ? If from Flask app you can use Signals in Model to send notification when the new row is added","Q_Score":0,"Tags":"android,python,mysql,firebase,push-notification","A_Id":49833949,"CreationDate":"2018-04-14T16:56:00.000","Title":"Python - send notification to Android app after the MySQL database has changed","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"i have build an app in django to extract data from an mssql server and display the results on a table on a template.\nwhat i want to do now is to export the same sql query results to an excel file. I have used pymssql driver to connect to the db and pysqlalchemy.","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":712,"Q_Id":49848167,"Users Score":0,"Answer":"my code actually worked. I thought it was going to save the excel file to 'C:\\excel' folder so i was looking for the file in the folder but i couldn't find the excel file. The excel file was actually exported to my django project folder instead. \nHow to i allow the end user to be able to download the file to their desktop instead of exporting it to the server itself","Q_Score":1,"Tags":"python,sql-server,django,sqlalchemy,django-views","A_Id":49850520,"CreationDate":"2018-04-16T00:36:00.000","Title":"python and Django export mssql query to excel","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We're currently trying to convert html files to PDF on AppEngine using Python. The HTML files are from a third-party vendor so we have no control over their format. Both the Flexible and Standard environments are options, but every path we go down we seem to hit a roadblock:\n\nPDFkit requires a wkhtml2pdf install, no PIP package available, however converts perfectly offline\nxhtml2pdf \/ PISA - works even on GAE Standard but doesn't support many features such as float and badly formatted HTML\nWeasyPrint - C dependencies in theory would run on the Flexible environment but no pip packages available for dependencies including Cairo and Pango\n\nHas anyone got a robust solution running on AppEngine with any of the above? Or with other libraries I am missing?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":870,"Q_Id":49859145,"Users Score":1,"Answer":"I ran into this same problem a year back and concluded that this is currently not possible in App Engine, at least with a good quality conversion. (Someone please point out if things have changed)\nxhtml2pdf - I was able to successfully run it in standard App Engine but not at all happy with the conversion quality.\nPDFkit - Ran into a similar problem and came up with a different solution. Hosted PDFkit on a Compute Engine Instance and exposed an endpoint wherein a POST request with the HTML file will return the converted PDF as a response. This gave me the best\/expected results in terms of quality\/speed of processing. \nIt did incur some extra charges but I was able to utilize the instance for something else too ;). I chose the least possible configuration initially since I was not storing anything on the Compute Engine Instance.","Q_Score":6,"Tags":"python-2.7,google-app-engine","A_Id":49923883,"CreationDate":"2018-04-16T13:59:00.000","Title":"HTML to PDF on Google AppEngine","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"When running scrapy shell [url] command i can use fetch() and other scrapy stuff all in ipython environment. What do i need to setup in ipython to be able run all scrapy shell methods in ipython?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":139,"Q_Id":49871847,"Users Score":0,"Answer":"Through scrapy\u2019s settings you can configure it to use any one of ipython, bpython or the standard python shell, regardless of which are installed. This is done by setting the SCRAPY_PYTHON_SHELL environment variable; or by defining it in your scrapy.cfg:\n[settings]\nshell = bpython","Q_Score":0,"Tags":"scrapy,ipython","A_Id":49878047,"CreationDate":"2018-04-17T07:05:00.000","Title":"how to setup ipython for scrapy debug","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a project developed in python\/django, i create my API interface for public a view of the db to my clients using POST GET and others calls, all done.\nNow i'am wondering what is the best way to create a real SDK for my program, i mean the possibility for my clients, using specific calls, to make my enviroment execute something and return result from their code.\nAre there some tools, like for example Django REST framework for the API, also for SDKs?\nThanks at all in advance","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1281,"Q_Id":49892526,"Users Score":4,"Answer":"API is server side while SDK is client side. \nFor example, you can provide APIs using python\/django. But your customers can use nodejs, C++, C#, JAVA... anything they want to communicate with your server.\nIf you provide a SDK for C++, that's just for C++ customers. For JAVA customers, you still need to provide another SDK for JAVA.\nSo in short, you cannot find a cross-language-sdk-generator.","Q_Score":0,"Tags":"python,sdk,django-rest-framework","A_Id":49893270,"CreationDate":"2018-04-18T06:21:00.000","Title":"Python create an SDK instead just an API","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've got an issue with scrapy and python.\nI have several links. I crawl data from each of them in one script with the use of loop. But the order of crawled data is random or at least doesn't match to the link.\nSo I can't match url of each subpage with the outputed data.\nLike: crawled url, data1, data2, data3.\nData 1, data2, data3 => It's ok, because it comes from one loop, but how can I add to the loop current url or can I set the order of link's list? Like first from the list is crawled as first, second is crawled as second...","AnswerCount":3,"Available Count":2,"Score":-0.0665680765,"is_accepted":false,"ViewCount":79,"Q_Id":49896079,"Users Score":-1,"Answer":"Ok, It seems that the solution is in settings.py file in scrapy.\nDOWNLOAD_DELAY = 3   \nBetween requests.\nIt should be uncommented. Defaultly it's commented.","Q_Score":0,"Tags":"python,scrapy","A_Id":49899202,"CreationDate":"2018-04-18T09:29:00.000","Title":"Scrapy - order of crawled urls","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've got an issue with scrapy and python.\nI have several links. I crawl data from each of them in one script with the use of loop. But the order of crawled data is random or at least doesn't match to the link.\nSo I can't match url of each subpage with the outputed data.\nLike: crawled url, data1, data2, data3.\nData 1, data2, data3 => It's ok, because it comes from one loop, but how can I add to the loop current url or can I set the order of link's list? Like first from the list is crawled as first, second is crawled as second...","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":79,"Q_Id":49896079,"Users Score":0,"Answer":"time.sleep() - would it be a solution?","Q_Score":0,"Tags":"python,scrapy","A_Id":49898314,"CreationDate":"2018-04-18T09:29:00.000","Title":"Scrapy - order of crawled urls","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"The \"Django-Rest-Framework (DRF) Throttling\" can help to prevent bruteforce attacks and failed login attempts.\nThen why do we need to use \"Django axes\", \"Django defender\", \"django-ratelimit\" or similar components?\nThanks In Advance","AnswerCount":2,"Available Count":2,"Score":1.0,"is_accepted":false,"ViewCount":1124,"Q_Id":49897735,"Users Score":6,"Answer":"Throttling, as provided by DRF, is very different to Authentication, which is the focus of Django Axes.\nIn DRF you can allow access to your resource (say a database) for a defined amount of times (i.e. 100 database lookups) in a given period (lets say a day), so they are throttled to that amount\/period, here 100\/day. In some use-cases the user need not even identify themselves necessarily to avail of your service, there is no authentication involved -here you look at the IP of the users system as a key to throttle the users activity.  Yes you can run throttling in conjunction with authentication in DRF, but one does not require the other.\nWhereas in Axes you are primarily concerned with having the user prove his identity (authentication) through the login process. You can also instruct Axes to deny a repeat-failing user the opportunity to authenticate, i.e. if you fail to login correctly for 10 attempts you are now banned from logging in for the next 5 minutes.  So typically a non authenticated user will never avail of your service and a repeat authenticate-failing attempts will result in that IP being denied the opportunity to authenticate for an extended time period.  The emphasis with Axes tends to be on determining why a user failed to authenticate and by which means they gained access to the system. For example from the Axes reports, you can determine how many users logged in that day using the link emailed to them from the registration page. Or which users logged in using facebook, and also how many users failed to login (IP, username or email for example).\nFurthermore, DRF is in effect an add-on to \"regular django\", and thus it\u00b4s throttling and authentication are tailored to the API service that it performs. Your users using an API are in general not likely to authenticate manually to the API but rather using some token (JWT,csrf) . Django Axes is also an add-on to regular django and typically services the needs of a typical web site with authenticating users. You can use both services, DRF and Axes on the one django platform, they work well together and do not clash.","Q_Score":3,"Tags":"python,django,django-rest-framework","A_Id":53496778,"CreationDate":"2018-04-18T10:44:00.000","Title":"What is different between \"DRF Throttling\" and \"Django Axes\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"The \"Django-Rest-Framework (DRF) Throttling\" can help to prevent bruteforce attacks and failed login attempts.\nThen why do we need to use \"Django axes\", \"Django defender\", \"django-ratelimit\" or similar components?\nThanks In Advance","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1124,"Q_Id":49897735,"Users Score":0,"Answer":"As far as I know, those libraries you mentioned all do the same thing (with a few differences between them). You can choose the one which best suits your needs.\nIf you are using DRF, then you don't need an aditional library (axes, ratelimit, etc.) because DRF already has the throttling functionality build in.","Q_Score":3,"Tags":"python,django,django-rest-framework","A_Id":49898372,"CreationDate":"2018-04-18T10:44:00.000","Title":"What is different between \"DRF Throttling\" and \"Django Axes\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to crawl a webpage(news) and get only the latest links. \nI have a crawler code which gets all the links from a website and takes like 2-3 hours to get around 30000 links and stores in db.\nWhat if next time when I run the crawler I want only the new links to be inserted.\nI know I can do a filter before inserting in db, but I would want the crawler to fetch only new links other than crawling the old links again(basically entire website). \nIs it possible to do something like that?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":51,"Q_Id":49899506,"Users Score":1,"Answer":"You need some sort of a cache.\nOne solution which comes to my mind is storing a local version of the website. When you want to add the new links you can make a diff between the new version and your locally stored version. Afterwards you can crawl over the diff...","Q_Score":0,"Tags":"python,web-scraping,web-crawler","A_Id":49899582,"CreationDate":"2018-04-18T12:16:00.000","Title":"Is there a way to crawl a webpage in python where the crawler shoud fetch only the new links.","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a server that is live right now, there is some SMTP stuff I want to change the settings.py of my Django project. I have made the changes, however, I cannot get the server to detect the changes, and it throws a SMTPAuthentication error because the settings.py is still using the old settings.\nThe server is set up with nginx, and I have tried service nginx reload several times, and apachectl restart several times. As well as deleting any *.pyc files.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2110,"Q_Id":49903923,"Users Score":3,"Answer":"nginx cannot be actually running the site, as it is not a WSGI server. Presumably it is running as a proxy to something like gunicorn or uWSGI; it is those that you need to restart.","Q_Score":3,"Tags":"python,django,nginx,uwsgi","A_Id":49903965,"CreationDate":"2018-04-18T15:47:00.000","Title":"Django settings.py not updating on production","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm looking for a way to hide code cells (inputs) when export my .iipynb file to a HTML. I don't want the code cells to be visible at all (not some button that turn them off\/on). The output is for people that have no idea what a programming language is. I tried many things that I found on the internet but nothing seems to work. \nThanks","AnswerCount":11,"Available Count":1,"Score":0.0181798149,"is_accepted":false,"ViewCount":69341,"Q_Id":49907455,"Users Score":1,"Answer":"Conversion of ipynb code file to a HTML file without code(Using Python)::\nStep1: Suppose your file Untitled.ipynb is saved in your laptop's Downloads folder.\nStep2: Open Anaconda prompt or Cmd , Paste the below command to hide the codes and save the file as Untitled.html:\n\ncd Downloads\njupyter nbconvert Untitled.ipynb --to=html --TemplateExporter.exclude_input=True\n\nNote: path to the Untitled.ipynb could be different and needs to be changed where we are using cd Downloads to cd new_path.","Q_Score":70,"Tags":"python,jupyter","A_Id":69387570,"CreationDate":"2018-04-18T19:18:00.000","Title":"Hide Code when exporting Jupyter notebook to HTML","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a API build using Python\/Flask, and I have a endpoint called \/build-task that called by the system, and this endpoint takes about 30 minutes to run. \nMy question is that how do I lock the \/build-task endpoint when it's started and running already? So so other user, or system CANNOT call this endpoint.","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":709,"Q_Id":49930033,"Users Score":2,"Answer":"You have some approaches for this problem:\n1 - You can create a session object, save a flag in the object and check if the endpoint is already running and respond accordingly.\n2 - Flag on the database, check if the endpoint is already running and respond accordingly.","Q_Score":1,"Tags":"python,flask","A_Id":49930152,"CreationDate":"2018-04-19T20:49:00.000","Title":"Python\/Flask: only one user can call a endpoint at one time","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I created several Keras models (Model_1, Model_2...Model_N) in one code. I would like to clear only one specified model (e.g. Model_1).\nI guess K.clear_session(), which will clear all models from the memory, is not useful in this case. Is there any solution?\nThank you in advance.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":36,"Q_Id":49936467,"Users Score":0,"Answer":"you can use del[] to explicitly delete the variables you no longer need, this triggers python's garbage collector. so put all the variables associated with that model inside del[] and python would free the memory.","Q_Score":2,"Tags":"python,keras","A_Id":49936800,"CreationDate":"2018-04-20T07:36:00.000","Title":"How can a specific model be cleared from the memory?","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have code like this, I want to check in the time range that has overtime and sum it.\ncurrently, am trying out.hour+1 with this code, but didn't work.\n\n\n    overtime_all = 5\n    overtime_total_hours = 0\n    out = datetime.time(14, 30)\n\n    while overtime_all > 0:\n        overtime200 = object.filter(time__range=(out, out.hour+1)).count()\n        overtime_total_hours = overtime_total_hours + overtime200\n        overtime_all -=1\n\n    print overtime_total_hours\n\n\nhow to add 1 hour every loop?...","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":2174,"Q_Id":49955821,"Users Score":1,"Answer":"Timedelta (from datetime) can be used to increment or decrement a datatime objects. Unfortunately, it cannot be directly combined with datetime.time objects. \nIf the values that are stored in your time column are datetime objects, you can use them (e.g.: my_datetime + timedelta(hours=1)). If they are time objects, you'll need to think if they represent a moment in time (in that case, they should be converted to datetime objects) or a duration (in that case, it's probably easier to store it as an integer representing the total amount of minutes, and to perform all operations on integers).","Q_Score":2,"Tags":"python,django","A_Id":49955858,"CreationDate":"2018-04-21T12:34:00.000","Title":"add +1 hour to datetime.time() django on forloop","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have code like this, I want to check in the time range that has overtime and sum it.\ncurrently, am trying out.hour+1 with this code, but didn't work.\n\n\n    overtime_all = 5\n    overtime_total_hours = 0\n    out = datetime.time(14, 30)\n\n    while overtime_all > 0:\n        overtime200 = object.filter(time__range=(out, out.hour+1)).count()\n        overtime_total_hours = overtime_total_hours + overtime200\n        overtime_all -=1\n\n    print overtime_total_hours\n\n\nhow to add 1 hour every loop?...","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":2174,"Q_Id":49955821,"Users Score":1,"Answer":"I found the solution now, and this is work.\n\n\n    overtime_all = 5\n    overtime_total_hours = 0\n    out = datetime.time(14, 30)\n\n    while overtime_all > 0:\n        overtime200 = object.filter(time__range=(out,datetime.time(out.hour+1, 30))).count()\n        overtime_total_hours = overtime_total_hours + overtime200\n        overtime_all -=1\n\n    print overtime_total_hours\n\ni do change out.hour+1 to datetime.time(out.hour+1, 30) its work fine now, but i dont know maybe there more compact\/best solution.\nthank you guys for your answer.","Q_Score":2,"Tags":"python,django","A_Id":49956349,"CreationDate":"2018-04-21T12:34:00.000","Title":"add +1 hour to datetime.time() django on forloop","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to create table in odoo 10 with the following columns: quantity_in_the_first_day_of_month,input_quantity,output_quantity,quantity_in_the_last_day_of_the_month.\nbut i don't know how to get the quantity  of the specified date","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":185,"Q_Id":49965402,"Users Score":0,"Answer":"You can join the sale order and sale order line to get specified date.\nselect \n    sum(sol.product_uom_qty)\nfrom \n    sale_order s,sale_order_line sol \nwhere \n    sol.order_id=s.id and\n    DATE(s.date_order) = '2018-01-01'","Q_Score":0,"Tags":"python,python-3.x,python-2.7,odoo,odoo-10","A_Id":50134759,"CreationDate":"2018-04-22T11:28:00.000","Title":"How to get the quantity of products in specified date in odoo 10","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Imagine you are measuring the distance of something with a Raspberry Pi. You have a nice python script which measures the distance via a sensor and returns a variable.\nImagine you would like to automate the process and view the results on a web page created with Flask. Basically, be able to turn it on and have it run once a minute regardless of whatever else you do in that web page or anywhere else on the \"website\".\nGraphically:\nclick a button on a web page -> Script starts -> Script runs once a minute, regardless of whether you close the page, navigate to another page, etc.\nHow would you go about it? \nConsider that the script can run forever if necessary, kind of a fire and forget thing","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":62,"Q_Id":49968037,"Users Score":0,"Answer":"you could create a second e.g. python script that would wait for a signal from the web server. With your server, after a user clicked a button, you could write to a file, that the python script periodically checks. Then, after writing \"1\" into the file, the script would do what you want, e.g. read sensor data every minute.\nSo you would run your web server and the python script alongside it. The script would be waiting for changes in the dedicated \"signal\" file. Then after the signal the script would do whatever you wanted.","Q_Score":0,"Tags":"python,python-3.x,flask,automation,raspberry-pi","A_Id":49968268,"CreationDate":"2018-04-22T16:10:00.000","Title":"Run a script repeatedly and externally from Flask","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have repeatedly installed and uninstalled beautifulsoup4, but no matter what I try to do, when I try to import bs4 in shell, I get ModuleNotFoundError. \nI'm on Windows 10 and using Python 3.6.4. I'm new to programming, but am on my third Python book and this is the first time I've run into a big problem trying to import a module, including those I've installed using pip.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":964,"Q_Id":49969085,"Users Score":0,"Answer":"So, I don't really understand what is happening, but I at least temporarily solved my problem. I have two different \"Lib > site-packages\" directories in my C: drive, and pip is installing in a different one from what Python is using. So I just copied the BeautifulSoup and bs4 folders and pasted them into the one that Python is using, and now it works. \nPython is using this folder: \"C:\\Users\\Victor Hart\\AppData\\Local\\Programs\\Python\\Python36-32\", while pip is installing bs4 and BeautifulSoup here: \"C:\\Users\\Victor Hart\\Envs\\virtual\", which doesn't make any sense to me.","Q_Score":2,"Tags":"python,beautifulsoup,pip","A_Id":49970573,"CreationDate":"2018-04-22T18:03:00.000","Title":"I have installed beautifulsoup4, but when I try to import bs4 in python shell, I get ModuleNotFound Error","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have repeatedly installed and uninstalled beautifulsoup4, but no matter what I try to do, when I try to import bs4 in shell, I get ModuleNotFoundError. \nI'm on Windows 10 and using Python 3.6.4. I'm new to programming, but am on my third Python book and this is the first time I've run into a big problem trying to import a module, including those I've installed using pip.","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":964,"Q_Id":49969085,"Users Score":1,"Answer":"Are you writing-\npip install beautifulsoup4 ?\nThis will install only beautifulsoup4 module and not bs4.\nDo this:-\npip install bs4\nAnd then do this in your python file:-\nfrom bs4 import BeautifulSoup\nAlso you may need administrator access for installing.","Q_Score":2,"Tags":"python,beautifulsoup,pip","A_Id":49969489,"CreationDate":"2018-04-22T18:03:00.000","Title":"I have installed beautifulsoup4, but when I try to import bs4 in python shell, I get ModuleNotFound Error","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've to run a python script from my HTML page button. When I click on the button, it should run the command \"python filename.py\". But I'm not getting any solutions, please help!\nThank You","AnswerCount":3,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":6251,"Q_Id":49994136,"Users Score":2,"Answer":"Sorry to say but this is not possible unless your 'filename.py' is on a server e.g. flask, or else this will not work. If setup a flask server, and with a certain route it runs your code, then you can have your HTML code make a POST or GET request to this flask server, and the code should run.","Q_Score":0,"Tags":"javascript,python,jquery,html","A_Id":49994177,"CreationDate":"2018-04-24T05:38:00.000","Title":"How to execute python script from a button in HTML page","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've to run a python script from my HTML page button. When I click on the button, it should run the command \"python filename.py\". But I'm not getting any solutions, please help!\nThank You","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":6251,"Q_Id":49994136,"Users Score":0,"Answer":"You can\u2019t.\nPython runs in the server. HTML isn\u2019t a programming language, it\u2019s content, and it sits in the browser. About the best you can do is use AJAX to call a function in the server (which you\u2019d have written in Python) and, if it returns a value, return it via AJAX.","Q_Score":0,"Tags":"javascript,python,jquery,html","A_Id":49994299,"CreationDate":"2018-04-24T05:38:00.000","Title":"How to execute python script from a button in HTML page","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My goal here is to use Puppeteer to generate a PDF from a HTML view in Django. Preferably, this happens every time a certain model is saved. The view requires the user to be logged-in and own the model instance used in the view. This, of course, creates problems when trying to launch a Puppeteer instance to access the view and turn it into a PDF -- all I get is a PDF of the login page.\nI can think of a few ways, none of which stand out as The Right Way to do things:\n\nGet the users session ID and set the corresponding cookie in Puppeteer, either on the command line or using an environment variable -- I'm not sure this will actually work, I think there are security issues and as I'd like to do this in the model.save() method I don't necessarily have access to the user session ID.\nMake the view require login only when not accessed from localhost -- this seems like a security issue.\n\nOther ways to do this would be to use a HTML-to-PDF library, but these come with a lot of limitations on the HTML\/CSS they can understand, or to draw the PDF directly using reportlab without going through the intermediate HTML stage.\nAny ideas or solutions I'm missing?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":391,"Q_Id":49997125,"Users Score":1,"Answer":"The simplest way is to render the template yourself, save the output to a temporary static HTML file and open that file with Puppeteer.\nYou will probably need to adjust the generated HTML to make sure all the static assets are accessible via proper absolute URL and protocol.","Q_Score":1,"Tags":"python,django,pdf,puppeteer","A_Id":49998257,"CreationDate":"2018-04-24T08:42:00.000","Title":"How do I allow Puppeteer to access a login-required view in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I got this error ModuleNotFoundError: No module named 'django.db.migrations.migration' after i tried these below steps\n\npython3 manage.py migrate --fake resources zero (resources is my\napp name)\nfind . -path \"*\/migrations\/*.py\" -not -name \"__init__.py\" -delete\nfind . -path \"*\/migrations\/*.pyc\"  -delete\npython3 manage.py showmigrations\n\nNote: used PostgreSQL\nHow to resolve this issue?","AnswerCount":3,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":5056,"Q_Id":50001428,"Users Score":6,"Answer":"By running those commands you might have accidentally deleted the migrations module. Try reinstalling Django via pip.\npip uninstall django\npip install django\nTake note of the version of Django you are using. In case you aren't using the latest version for your python environment install using the following command\npip install django==<version goes here>\nEdit:-\nDrop the existing database schema. Delete the migrations folder and recreate an empty one in its place.","Q_Score":3,"Tags":"django,python-3.x,django-models,wagtail","A_Id":50009168,"CreationDate":"2018-04-24T12:15:00.000","Title":"Python-ModuleNotFoundError: No module named 'django.db.migrations.migration'","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Since my app has background tasks, I use the Flask context. For the context to work, the Flask setting SERVER_NAME should be set.\nWhen the SERVER_NAME is set the incoming requests are checked to match this value or the route isn't found. When placing an nginx (or other webserver in front), the SERVER_NAME should also include the port and the reverse proxy should handle the rewrite stuff, hiding the port number from the outside world (which it does).\nFor session cookies to work in modern browsers, the URL name passed by the proxy should be the same as the SERVER_NAME, otherwise the browser refuses to send the cookies. This can be solved by adding the official hostname in the \/etc\/hosts and setting it to 127.0.0.1.\nThere is one thing that I haven't figured out yet and it is the URL in the background tasks. url_for() is used with the _external option to generate URLs in the mail it sends out. But that URL includes the port, which is different from the 443 port used by my nginx instance.\nRemoving the port from the SERVER_NAME makes the stuff described in the first paragraph fail.\nSo what are my best options for handling the url_for in the mail. Create a separate config setting? Create my own url_for?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":686,"Q_Id":50001950,"Users Score":0,"Answer":"You should use url_for(location, _external=True)\nor include proxy_params if you use nginx.","Q_Score":12,"Tags":"python,email,flask,nginx-reverse-proxy,celery-task","A_Id":54558887,"CreationDate":"2018-04-24T12:39:00.000","Title":"Flask SERVER_NAME setting best pratices","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"when I want to put my project on GAE i get this error in SDK shell:\nERROR: (gcloud.app.deploy) Permissions error fetching application [apps\/responsive-my-super-app-201910]. Please make sure you are using the correct project ID and that you have permission to view applications on the project.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":47,"Q_Id":50005300,"Users Score":1,"Answer":"You haven't authenticated the cloud SDK. Try running gcloud auth list. Is your email included in the credentialed accounts? If not, run glcoud auth login.\nIf you are listed in the credentialed accounts, then perhaps you haven't properly associated your project with your login, or you have a typo in your project name.","Q_Score":1,"Tags":"python-2.7,google-app-engine","A_Id":50029739,"CreationDate":"2018-04-24T15:18:00.000","Title":"deploying web application on GAE","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm currently working on gateway with an embedded Linux and a Webserver. The goal of the gateway is to retrieve data from electrical devices through a RS485\/Modbus line, and to display them on a server.\nI'm using Nginx and Django, and the web front-end is delivered by \"static\" files. Repeatedly, a Javascript script file makes AJAX calls that send CGI requests to Nginx. These CGI requests are answered with JSON responses thanks to Django. The responses are mostly data that as been read on the appropriate Modbus device.\nThe exact path is the following :\nRandomly timed CGI call -> urls.py -> ModbusCGI.py (import an other script ModbusComm.py)-> ModbusComm.py create a Modbus client and instantly try to read with it.\nNext to that, I wanted to implement a Datalogger, to store data in a DB at regular intervals. I made a script that also import the ModbusComm.py script, but it doesn't work : sometime multiple Modbus frames are sent at the same time (datalogger and cgi scripts call the same function in ModbusComm.py \"files\" at the same time) which results in an error.\nI'm sure this problem would also occur if there are a lot of users on the server (CGI requests sent at the same time). Or not ? (queue system already managed for CGI requests? I'm a bit lost)\nSo my goal would be to make a queue system that could handle calls from several python scripts => make them wait while it's not their turn => call a function with the right arguments when it's their turn (actually using the modbus line), and send back the response to the python script so it can generate the JSON response.\nI really don't know how to achieve that, and I'm sure there are better way to do this. \nIf I'm not clear enough, don't hesitate to make me aware of it :)","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":389,"Q_Id":50010615,"Users Score":0,"Answer":"I had the same problem when I had to allow multiple processes to read some Modbus (and not only Modbus) data through a serial port. I ended up with a standalone process (\u201cserial port server\u201d) that exclusively works with a serial port. All other processes work with that port through that standalone process via some inter processes communication mechanism (we used Unix sockets).\nThis way when an application wants to read a Modbus register it connects to the \u201cserial port server\u201d, sends its request and receives the response. All the actual serial port communication is done by the \u201cserial port server\u201d in sequential way to ensure consistency.","Q_Score":0,"Tags":"python,django,multithreading,asynchronous,concurrency","A_Id":50105654,"CreationDate":"2018-04-24T20:57:00.000","Title":"Django\/Python - Serial line concurrency","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am learning to implement Flask application.\nAnd using mysql as a database.\nI tried MySQLdb, flask_mysql & flask_sqlalchemy.\nBut still getting this error, when i try to perform any action on database :\nsqlalchemy.exc.OperationalError: (_mysql_exceptions.OperationalError) (2059, \"Authentication plugin 'caching_sha2_password' cannot be loaded: The specified module could not be found.\\r\\n\")\nI also tried :\nALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password  BY 'root';\nPlease help.\nThanks.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2259,"Q_Id":50015205,"Users Score":0,"Answer":"You probably need to install the mysql client. On Debian based systems you can use sudo apt install mysql-client -y. I ran into this while using the Python 3.6 Docker image.","Q_Score":1,"Tags":"python-3.x,flask,flask-sqlalchemy,mysql-python","A_Id":50295359,"CreationDate":"2018-04-25T06:15:00.000","Title":"sqlalchemy.exc.OperationalError: (_mysql_exceptions.OperationalError) (2059, \"Authentication plugin 'caching_sha2_password'","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Trying to make a script to scrape one or two articles (article URLs only) from different websites, i was able to make a Python script that uses BeautifulSoup to get the website's HTML, find the website's Navbar menu via its Class name, and loop trough each website section, the problem is that each website has a different Class name or Xpath for the Navbar menu and its sections ..\nIs there a way to make the script work for multiple websites with as little human intervention as possible ? \nAny suggestions are more than welcome,\nThanks","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":77,"Q_Id":50018551,"Users Score":1,"Answer":"Did it, i have only needed to use Python and Selenium, an Xpath for the Navbar Elements for each website and another Xpath for all types of articles on the different website pages, saved everything on a database and the rest is just customized for our specific needs, it wasn't that complicated in the end, thanks for the help <3","Q_Score":0,"Tags":"python,web-scraping,beautifulsoup,scrape,scraper","A_Id":51704866,"CreationDate":"2018-04-25T09:23:00.000","Title":"Is it possible to automatically scrape articles from websites - Python & Beautiful Soup","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to a simple make a http request to a server inside my company, from a dev server. I figured out that depending on the origin \/ destination server, I might, or not, to be forced to use qualified name of the destination server, like srvdestination.com.company.world instead of just srvdestination.\nI am ok with this, but I don't understand how come my DB connection works?\nLet's say I have srvorigin. Now, to make http request, I must use qualified name srvdestination.com.company.world. However, for database connection,  the connection string with un-qualified name is enough psycopg.connect(host='srvdestination', ...) I understand that protocols are different, but how psycopg2 does to resolve the real name?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":134,"Q_Id":50018843,"Users Score":0,"Answer":"First it all depend on how the name resolution subsystem of your OS is configured. If you are on Unix (you did not specify), this is governed by \/etc\/resolv.conf.  Here you can provide the OS with a search list: if a name has not \"enough\" dots (the number is configurable) then a suffix is added to retry resolution.\nThe library you use to do the HTTP request may not query the OS for name resolution and do its DNS resolution itself. In which case, it can only work with the information you give it (but it could as well re-use the OS \/etc\/resolv.conf and information in it), hence the need to use the full name.\nOn the contrary, the psycopg2 may use the OS resolution mechanism and hence dealing with \"short\" names just fine.\nBoth libraries should have documentation on how they handle hostnames... or otherwise you need to study their source code. I guess psycopg2 is a wrapper around the default libpq standard library, written in C if I am not mistaken, which hence certainly use the standard OS resolution process. \nI can understand the curiosity around this difference but anyway my advice is to keep short names when you type commands on the shell and equivalent (and even there it could be a problem), but always use FQDNs (Fully Qualified Domain Names) in your program and configuration files. You will avoid a lot of problems.","Q_Score":0,"Tags":"python,dns,psycopg2","A_Id":50476805,"CreationDate":"2018-04-25T09:37:00.000","Title":"Name resolving in http requests","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was wondering if there was a way to create an instance without a Key-Pair for testing purposes.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":225,"Q_Id":50047929,"Users Score":0,"Answer":"You can create an instannce without keypair however you will not be able to ssh into it or you can start it with ssm agent installed and running and use ec2 ssm service to send shell commands.","Q_Score":0,"Tags":"python,boto3","A_Id":50048241,"CreationDate":"2018-04-26T16:28:00.000","Title":"Boto3 Create Instance without a Key-Pair","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have some questions about saltstack.\nI'm trying to deploy my Django project with saltstack and made that minion install required packages with pip by setting it's bin_env. (django lib, etc...)\nBut when I run a command (python manage.py something) It says there's no django and to activate virtual environment.\nI read salt docs about venv module(state) but the only thing in there was creating venv.\nHow can I activate the minion's venv?\nthank you.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":812,"Q_Id":50054591,"Users Score":0,"Answer":"$  source \/(directory path you put for bin_env)\/bin\/activate","Q_Score":2,"Tags":"python,django,salt-stack","A_Id":50055852,"CreationDate":"2018-04-27T03:03:00.000","Title":"Salt: Activate virtual environment on salt minion","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on writing a blog and came across two different alternatives on the internet for making pagination. I couldn't decide which to use. Url types are like ;\n\nblog\/page\/2\nblog\/?page=2\n\nDoes one of these have an advantage over the other?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":6232,"Q_Id":50071884,"Users Score":11,"Answer":"Best practices are that path parameters are used to identify a specific resource, and query parameters filter or sort that resource.\nIf you are adding a pagination with articles, it would be ideal to use query parameters to sort through the articles. It is common for this query parameter to be referred to as offset, as you would be filtering through your articles. \nSo for example if you had 100 articles you've posted, and you want to display 10 articles per pagination page, and you were on page 2 of 10 in your pagination, your offset query parameter would be ?offset=10  because you would be filtering for articles 10-19 to display. (because articles 0-9 were displayed on your first pagination page)\nThis offset query parameter would increase by 10 every pagination page you increase, then filtering to the next 10 articles.","Q_Score":8,"Tags":"python,django,url,pagination,url-pattern","A_Id":50071982,"CreationDate":"2018-04-28T01:08:00.000","Title":"Pagination with URL path or the query parameters","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to python and thought it would be great to have my very first python project running on AWS infrastructure. Given my previous node.js experience with lambdas, I thought that every function would have its own code and the app is only glued together by the persistence layer, everything else are decoupled separate functions.\nIn Python lambdas there are serverless microframeworks like Chalice or Zappa that seem to be an accepted practice. For me though it feels like they are hacking around the concept of serverless approach. You still have a full-blown app build on let's say Flask, or even Django, and that app is served through lambda. There is still one application that has all the routing, configs, boilerplate code, etc instead of small independent functions that just do their job. I currently do not see how and if this makes like any easier.\n\nWhat is the benefit \/ reason for having the whole code base served through lambdas as opposed to individual functions?\nIs there an execution time penalty if using flask\/django\/whatever else with serverless apps? \nIf this depends on the particular project, what would be the guidance when to use framework, and when to use individual functions?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":596,"Q_Id":50080592,"Users Score":0,"Answer":"Benefits. You can use known concept, and adopt it in serverless.\nPerformance. The smaller code is the less ram it takes. It must be loaded, processed, and so on. Just to process single request? For me that was always too much.\nLet's say you have diango project, that is working on elastic beanstalk, and you need some lamdas to deal with limited problems. Now. Do you want to have two separate configurations? What about common functions? \n\nServerless looks nice, but... let's assume that you have permissions, so your app, for every call will pull that stuff. Perhaps you have it cached - in redis, as a hole permissions for user... Other option is dynamodb, which is even more expensive. Yes there is nice SLA, but API is quite strange, also if you plan keeping more data there... the more data you have the slower it work - for same money. In other words - if you put more data, fetching will cost more - if you want same speed.","Q_Score":3,"Tags":"python,python-3.x,aws-lambda","A_Id":50080743,"CreationDate":"2018-04-28T20:06:00.000","Title":"Why use zappa\/chalice in serverless python apps?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have been trying to deploy my project for approx 1.5 hours but I don't seem to have made any progress. Up to 10 solid minutes pass after I run the \"gcloud app deploy --project [my project name here]\" and nothing ever happens. The console shows that it's attempting to process the command but never progresses to show anything (except that my python which statements failed - I can run Python fine though so I don't that that's an issue). I have tried:\n\nfollowing the quickstart guide (twice to make sure I followed the steps)\nre-ran gcloud components install app-engine-python command\nran the gcloud components update command\n\nI've also spent this time researching as many forum posts as I reasonably could but to no avail. If anyone has advice on how to resolve this I would greatly appreciate the assist.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":377,"Q_Id":50084272,"Users Score":2,"Answer":"Found the solution. For some reason I can't use the command while in the GitBash terminal - I had to use the Windows Command Line. This may seem like a silly mistake, but I hope that it saves someone some time in the future.","Q_Score":0,"Tags":"python,google-app-engine","A_Id":50084297,"CreationDate":"2018-04-29T07:17:00.000","Title":"App Engine - Deploying Stuck With No Progression","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm coding watermarking images in JES and I was wondering how to Watermark a picture by automatically scaling a watermark image?\nIf anyone can help me that would be great.\nThanks.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":174,"Q_Id":50111820,"Users Score":0,"Answer":"Ill start by giving you a quote from the INFT1004 assignment you are asking for help with.\n\"In particular, you should try not to use code or algorithms from external sources, and not to obtain help from people other than your instructors, as this can prevent you from mastering these concepts\"\nIt specifically says in this assignment that you should not ask people online or use code you find or request online, and is a breach of the University of Newcastle academic integrity code - you know the thing you did a module on before you started the course. A copy of this post will be sent along to the course instructor.","Q_Score":1,"Tags":"python,python-3.x,python-2.7,jython,jes","A_Id":50282582,"CreationDate":"2018-05-01T05:40:00.000","Title":"How to auto scale in JES","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have built a web app in Python and Flask and am having trouble pulling the date and time from my SQLite database.\nI enter the date into the DB with the following line-\norder.order_placed = datetime.datetime.now().strftime(\"%Y-%m-%d %H:%M:%S\")\nWhich with my current example enters the following into the DB -\n2018-05-01 12:08:49\nBut when I call order.order_placed I get datetime.date(2018, 5, 1)\nEven if I call str(order.order_placed) I get '2018-05-01'\nCan someone help me get the full date and time out of the database? Thanks!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":252,"Q_Id":50115624,"Users Score":1,"Answer":"It's possible that you're using DateField when in actuality you want to use DateTimeField.\nFurthermore, you don't need to call strftime before storing the data. Peewee works nicely with Python datetime objects.","Q_Score":1,"Tags":"python,sqlite,flask,peewee","A_Id":50118318,"CreationDate":"2018-05-01T11:23:00.000","Title":"Peewee and SQLite returning incorrect date format","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Could you please help me with the following error? I am trying to deploy a web app to Azure and I encounter the following issue: \n\nEven if by requirements, a newer version of setuptools is installed,\n  the deployment fails with the error:\"  RuntimeError: cryptography\n  requires setuptools 18.5 or newer, please upgrade to a newer version\n  of setuptools\".\n\nThe whole log is as it follows: \n\nCommand: \"D:\\home\\site\\deployments\\tools\\deploy.cmd\" Handling python\n  deployment. Detected requirements.txt.  You can skip Python specific\n  steps with a .skipPythonDeployment file. Detecting Python runtime from\n  site configuration Detected python-3.4 Found compatible virtual\n  environment. Pip install requirements. Downloading\/unpacking\n  setuptools>=18.5 (from -r requirements.txt (line 1)) Requirement\n  already satisfied (use --upgrade to upgrade): Flask==0.12.1 in\n  d:\\home\\site\\wwwroot\\env\\lib\\site-packages (from -r requirements.txt\n  (line 2)) Downloading\/unpacking azure-storage-file==1.1.0 (from -r\n  requirements.txt (line 3))   Downloading\n  azure_storage_file-1.1.0-py2.py3-none-any.whl Downloading\/unpacking\n  azure-storage-common>=1.1.0,<1.2.0 (from azure-storage-file==1.1.0->-r\n  requirements.txt (line 3)) Downloading\/unpacking\n  azure-storage-nspkg>=2.0.0 (from azure-storage-file==1.1.0->-r\n  requirements.txt (line 3))   Downloading\n  azure_storage_nspkg-3.0.0-py2.py3-none-any.whl Downloading\/unpacking\n  azure-common>=1.1.5 (from azure-storage-file==1.1.0->-r\n  requirements.txt (line 3))   Downloading\n  azure_common-1.1.10-py2.py3-none-any.whl Downloading\/unpacking\n  cryptography (from\n  azure-storage-common>=1.1.0,<1.2.0->azure-storage-file==1.1.0->-r\n  requirements.txt (line 3))   Running setup.py\n  (path:D:\\home\\site\\wwwroot\\env\\build\\cryptography\\setup.py) egg_info\n  for package cryptography\n      Traceback (most recent call last):\n        File \"\", line 17, in \n        File \"D:\\home\\site\\wwwroot\\env\\build\\cryptography\\setup.py\", line 28, in \n          \"cryptography requires setuptools 18.5 or newer, please upgrade to a \"\n      RuntimeError: cryptography requires setuptools 18.5 or newer, please upgrade to a newer version of setuptools\n      Complete output from command python setup.py egg_info:\n      Traceback (most recent call last):   File \"\", line 17, in    File\n  \"D:\\home\\site\\wwwroot\\env\\build\\cryptography\\setup.py\", line 28, in\n  \n      \"cryptography requires setuptools 18.5 or newer, please upgrade to a \" RuntimeError: cryptography requires setuptools 18.5 or newer,\n  please upgrade to a newer version of setuptools\n  ---------------------------------------- Cleaning up... Command python setup.py egg_info failed with error code 1 in\n  D:\\home\\site\\wwwroot\\env\\build\\cryptography Storing debug log for\n  failure in D:\\home\\pip\\pip.log An error has occurred during web site\n  deployment. \\r\\nD:\\Program Files\n  (x86)\\SiteExtensions\\Kudu\\73.10426.3381\\bin\\Scripts\\starter.cmd\n\"D:\\home\\site\\deployments\\tools\\deploy.cmd\"\n\nThanks in advance!","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1123,"Q_Id":50135928,"Users Score":0,"Answer":"You need to upgrade the python module setuptools installed on your target.\nIf you used python3 (it looks to be case from the log), run this command: pip3 install --upgrade setuptools\nIf you are still using python2 then this command pip install --upgrade setuptools.\nIf you do not have permission access then use the flag --user: pip3 install --user --upgrade setuptools","Q_Score":0,"Tags":"python,azure,deployment,setuptools,azure-web-app-service","A_Id":50253268,"CreationDate":"2018-05-02T13:31:00.000","Title":"Error Deployment on Azure","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"Google Assistant SDK: My user input is always constant, meaning same user command all the time, so instead of asking the user to everytime record a voice commandvia a device microphone, I want to have the user press a button and execute the command by passing a pre-recorded audio file as input. Is that possible with the Google assistant SDK? Preferably in Python as I want to built an API endpoint around it\nAny links, blogs, tutorials, samples etc would be very helful","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1035,"Q_Id":50156074,"Users Score":0,"Answer":"py -m googlesamples.assistant.grpc.pushtotalk --device-id \"your device id\" --device-model-id \"your device model\" -i \"your_sound_file.wav\"'\nthis will not wait for you to play a file, it will send the file and exeute and exit. but anyways, I had went to a website, can't remember which, but it would generate wav files of whatever you wanted. I did \"turn on the porch light\". Now I have a script that loops infinitely, checks if it can ping my cell phone on my home network, and if it detects its arrival, and it is between 7pm and 7am, it will turn on the porch light for me automatically. The only thing I have a problem with is, I do not need to hear the assistants voice. I wish there was a way to send an arg that muted assistant responses for the current \"conversation\". I use nircmd, copied to system32 folder in windows, to get around this though and I set the volume to 0, then do the assistant thing, then set the volume back to 20%. Works pretty good.","Q_Score":0,"Tags":"python,python-3.x,google-assistant-sdk,google-assist-api","A_Id":67032898,"CreationDate":"2018-05-03T13:18:00.000","Title":"Python: Can you directly pass an audio file as user input command to Google Assistant SDK?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am using server(server_name.corp.com) inside a corporate company. On the server i am running a flask server to listen on 0.0.0.0:5000.\nservers are not exposed to outside world but accessible via vpns.\nNow when i run host server_name.corp.com in the box i get some ip1(10.*.*.*)\nWhen i run ifconfig in the  box it gives me ip2(10.*.*.*).\nAlso if i run ping server_name.corp.com in same box i get ip2.\nAlso i can ssh into server with ip1 not ip2\nI am able to access the flask server at ip1:5000 but not on ip2:5000.\nI am not into networking so fully confused on why there are 2 different ips and why i can access ip1:5000 from browser not ip2:5000.\nAlso what is equivalent of host command in python ( how to get ip1 from python. I am using socktet.gethostbyname(server_name.corp.com) which gives me ip2)","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":84,"Q_Id":50166145,"Users Score":0,"Answer":"Not quite clear about the network status by your statements, I can only tell that if you want to get ip1 by python, you could use standard lib subprocess, which usually be used to execute os command. (See subprocess.Popen)","Q_Score":0,"Tags":"python,linux,networking,server,ip","A_Id":50166912,"CreationDate":"2018-05-04T02:07:00.000","Title":"Host command and ifconfig giving different ips","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Does anyone know how to check if a subdomain exists on a website?\nI am doing a sign up form and everyone gets there own subdomain, I have some javascript written on the front end but I need to find a way to check on the backend.","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":237,"Q_Id":50185118,"Users Score":1,"Answer":"Do a curl or http request on subdomain which you want to verify, if you get 404 that means it doesn't exists, if you get 200 it definitely exists","Q_Score":0,"Tags":"javascript,python,subdomain","A_Id":50185326,"CreationDate":"2018-05-05T02:23:00.000","Title":"how to use python to check if subdomain exists?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Does anyone know how to check if a subdomain exists on a website?\nI am doing a sign up form and everyone gets there own subdomain, I have some javascript written on the front end but I need to find a way to check on the backend.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":237,"Q_Id":50185118,"Users Score":0,"Answer":"Put the assigned subdomain in a database table within unique indexed column. It will be easier to check from python (sqlalchemy, pymysql ect...) if subdomain has already been used + will automatically prevent duplicates to be assigned\/inserted.","Q_Score":0,"Tags":"javascript,python,subdomain","A_Id":50185317,"CreationDate":"2018-05-05T02:23:00.000","Title":"how to use python to check if subdomain exists?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We have a Java application in our project and what we want is to call some Python script and return results from it. What is the best way to do this?\nWe want to isolate Python execution to avoid affecting Java application at all. Probably, Dockerizing Python is the best solution. I don't know any other way.\nThen, a question is how to call it from Java.\nAs far as I understand there are several ways:\n\nstart some web-server inside Docker which accepts REST calls from Java App and runs Python scripts and returns results to Java via REST too.\nhandle request and response via Docker CLI somehow.\nuse Java Docker API to send REST request to Docker which then converted by Docker to Stdin\/Stdout of Python script inside Docker.\n\nWhat is the most effective and correct way to connect Java App with Python, running inside Docker?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1012,"Q_Id":50191768,"Users Score":2,"Answer":"You don\u2019t need docker for this. There are a couple of options, you should choose depending on what your Java application is doing. \n\nIf the Java application is a client - based on swing, weblaunch, or providing UI directly - you will want to turn the python functionality to be wrapped in REST\/HTTP calls. \nIf the Java application is a server\/webapp - executing within Tomcat, JBoss or other application container - you should simply wrap the python scrip inside a exec call. See the Java Runtime and ProcessBuilder API for this purpose.","Q_Score":0,"Tags":"java,python,docker","A_Id":50197429,"CreationDate":"2018-05-05T16:40:00.000","Title":"Calling Python scripts from Java. Should I use Docker?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"This is more of an architectural question. If I should be asking this question elsewhere, please let me know and I shall.\nI have a use-case where I need to run the same python script (could be long-running) multiple times based on demand and pass on different parameters to each of them. The trigger for running the script is external and it should be able to pass on a STRING parameter to the script along with the resource configurations each script requires to run. We plan to start using AWS by next month and I was going through the various options I have. AWS Batch and Fargate both seem like feasible options given my requirements of not having to manage the infrastructure, dynamic spawning of jobs and management of jobs via python SDK. \nThe only problem is that both of these services are not available in India. I need to have my processing servers in India physically. What options do I have? Auto-scaling and Python SDK management (Creation and Deletion of tasks) are my main requirements (preferably containerized).","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":41,"Q_Id":50217591,"Users Score":0,"Answer":"Why are you restricted to India? Often restrictions are due to data retention, in which case just store your data on Indian servers (S3, DynamoDB etc) and then you are able to run your 'program' in another AWS region","Q_Score":0,"Tags":"python,amazon-web-services,containers,autoscaling,serverless","A_Id":50270433,"CreationDate":"2018-05-07T15:22:00.000","Title":"AWS: containarised serverless solutions","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm new to Scrapy and Scrapyd and I'm experimenting with them. \nI have deployed a simple Flask app with Gunicorn that has an API endpoint that sends a call to scrapyd to schedule a spider.\nLocally I have to launch scrapyd in a separate terminal to listen to calls from the Flask endpoint, but how is it possible to do the same on Heroku? I mean to be able to process requests to the Flask's endpoint and to listen to calls from the Flask to scrapyd at the same time. \nAny help much appreciated.\nThanks!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":307,"Q_Id":50223446,"Users Score":0,"Answer":"You can use scrapyd endpoint to schedule an spider from your flask front-end which sends an http request to scrapyd and for checking if the jobs is finished you can call running jobs if job-id exist in running jobs or not . There can also be better way to do it you can return an signal after the crawling has been finished.","Q_Score":0,"Tags":"python,flask,scrapyd","A_Id":52906522,"CreationDate":"2018-05-07T22:41:00.000","Title":"Is there a way to run scrapyd while running flask on Heroku","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"this is rather a straightforward question, i've tried to find something about it but either im totally out of my mind or it is not so easy to find out, Is there a way to have say: Microservice 1 (in Nodejs) and Microservice 2 (in Python) under the same ApiGateWay (Nodejs Express) ... i made it work using Nodejs (express) as gateWay and 2 Microservices in Nodejs (Cote.js) with no problem at all, but now i need part of the logic in python (Flask) .. what is the best approach to use a second language? i read something about an internal restApi but i could not find any clear example.\nby the way: If Docker helps i can totally use it, don't hesitate about it.","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":1401,"Q_Id":50225125,"Users Score":2,"Answer":"Its a rather usual case to have different microservices use different technologies. However they need an api to communicate with each other. Often that is a rest api. For example Microservice 1 listens on port x to requests. Depending on the requested url path (e.g \/hello-world) it will return a string representation (e.g json) of the requested data.\nDocker can help you with setting the ports of the services and glueing everything together.","Q_Score":1,"Tags":"node.js,python-3.x,docker,microservices","A_Id":50227627,"CreationDate":"2018-05-08T02:57:00.000","Title":"Multiple-language microservice approach","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm running a Django project with an virtualenv, I want to get in views the path of running python or of the virtual environment that I'm using\nThe goal is to pass this path to subprocess to execute a script\nThank you","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":108,"Q_Id":50230563,"Users Score":0,"Answer":"The idea of @DanielRoseman was great, I used management.call_command instead of subprocess and it works fine, the correct virtual environement is passed implicitly","Q_Score":2,"Tags":"django,python-3.x,subprocess,virtualenv","A_Id":50253752,"CreationDate":"2018-05-08T09:41:00.000","Title":"Get virtualenv or python path in views","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm running a Django project with an virtualenv, I want to get in views the path of running python or of the virtual environment that I'm using\nThe goal is to pass this path to subprocess to execute a script\nThank you","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":108,"Q_Id":50230563,"Users Score":1,"Answer":"Have you tried request.META? \nI found out some useful information there.\n(I'm using pyenv now and I found PATH, PYENV_DIR, PYENV_ROOT, PYENV_VIRTUAL_ENV, VIRTUAL_ENV and so on.)","Q_Score":2,"Tags":"django,python-3.x,subprocess,virtualenv","A_Id":50231575,"CreationDate":"2018-05-08T09:41:00.000","Title":"Get virtualenv or python path in views","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"I want to let a class run on my server, which contains a connected bluetooth socket and continously checks for incoming data, which can then by interpreted. In principle the class structure would look like this:\nInterpreter:\n-> connect (initializes the class and starts the loop)\n-> loop (runs continously in the background)\n-> disconnect (stops the loop)\nThis class should be initiated at some point and then run continously in the background, from time to time a http request would perhaps need data from the attributes of the class, but it should run on its own.\nI don't know how to accomplish this and don't want to get a description on how to do it, but would like to know where I should start, like how this kind of process is called.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":359,"Q_Id":50233238,"Users Score":0,"Answer":"Django on its own doesn't support any background processes - everything is request-response cycle based.\nI don't know if what you're trying to do even has a dedicated name. But most certainly - it's possible. But don't tie yourself to Django with this solution.\nThe way I would accomplish this is I'd run a separate Python process, that would be responsible for keeping the connection to the device and upon request return the required data in some way. \nThe only difficulty you'd have is determining how to communicate with that process from Django. Since, like I said, django is request based, that secondary app could expose some data to your Django app - it could do any of the following:\n\nExpose a dead-simple HTTP Rest API\nExpose an UNIX socket that would just return data immediatelly after connection\nContinuously dump data to some file\/database\/mmap\/queue that Django could read","Q_Score":1,"Tags":"python,django,asynchronous,webserver,channels","A_Id":50233425,"CreationDate":"2018-05-08T12:08:00.000","Title":"(Django) Running asynchronous server task continously in the background","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"When searching my db all special characters work aside from the \"+\" - it thinks its a space. Looking on the backend which is python, there is no issues with it receiving special chars which I believe it is the frontend which is Javascript\nwhat i need to do is replace \"+\" == \"%2b\". Is there a way for me to use create this so it has this value going forth?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":105,"Q_Id":50240427,"Users Score":1,"Answer":"You can use decodeURIComponent('%2b'), or encodeUriComponent('+');\nif you decode the response from the server, you get the + sign-\nif you want to replace all ocurrence just place the whole string insde the method and it decodes\/encodes the whole string.","Q_Score":0,"Tags":"javascript,python,replace,syntax","A_Id":50240590,"CreationDate":"2018-05-08T18:49:00.000","Title":"Replace character with a absolute value","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"When I run python manage.py shell_plus there are many pre and post imports there. How can I hide them(I want to use it but not to see it). I use python 3.4.3 and ipython 6.2.1","AnswerCount":2,"Available Count":1,"Score":-0.0996679946,"is_accepted":false,"ViewCount":95,"Q_Id":50246070,"Users Score":-1,"Answer":"shell_plus imports all of the models from your INSTALLED_APPS, plus a few from Django itself. You can tell it not to load some of your apps and models with SHELL_PLUS_DONT_LOAD but there is no way to hide the report of what's been imported. \nOut of curiosity, why would you not want to? They scroll past in a flash and aren't in your way, and are sometimes important to telling you what's been imported from where. \nYou would have to contribute this feature to the project if you really need it, but I have to say it's hard to imagine a use case for it.","Q_Score":0,"Tags":"python,django,ipython,django-extensions","A_Id":50246437,"CreationDate":"2018-05-09T05:25:00.000","Title":"django extensions hide pre and post imports","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Here in Brazil, the government made an app that you can type in the name of the item, for example \"Refined Sugar 2kg\" and the app return to you the location of the nearest market that has the cheapest item.\nIt extends to all sort of products, and I'm thinking about creating an app using that database. It is public, so it's not a crime, but they do not list all the products on the screen right away with categories and etc. The app only have a search bar, and that's it.\nHow can I get that database? I thought of an crawler (probably python), but all the crawlers that i see has an webpage as a 'target'. I never programmed mobile, so I don't know if a crawler can do that job.\nSo, what should I study in order to make an tool to extract that information?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":54,"Q_Id":50260803,"Users Score":2,"Answer":"\"How can I get that database? \"  The legal way would be to just ask them for it. Their database likely has passwords\/etc which means it is not meant for public use outside of the functionality that the application you mentioned provides. Are there ways to access this data without asking the owner of the information? Possibly. But to attain the data in any other way then asking for it and receiving it, then my friend you are entering a grey area. A crawler won't be much help for what you're trying to do.","Q_Score":0,"Tags":"python,database,mobile,web-crawler,extract","A_Id":50260896,"CreationDate":"2018-05-09T19:32:00.000","Title":"How can I get the database of an app that only has a search field","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"When I try to use Flask extensions, my application is raising ModuleNotFound errors on lines like from flask.ext.sqlalchemy import SQLAlchemy or from flask.exthook import ExtDeprecationWarning. I have Flask and the extension installed. Why do I get this error?","AnswerCount":2,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":5032,"Q_Id":50261135,"Users Score":21,"Answer":"Something in your code, or in code you're using, is trying to import flask.ext or flask.exthook, which no longer exists in Flask 1.0. They were completely removed after being visibly deprecated for at least a year, and implicitly deprecated for many years before that. Anything that still depends on it must be upgraded.\nAny use of from flask.ext import ... should be replaced with a direct import of the extension. For example flask.ext.sqlalchemy becomes flask_sqlalchemy.\nThe only reason to import from flask.exthook import ExtDeprecationWarning is to silence the previous deprecation warnings. Since it no longer exists, there is no warning to silence, and that code can be removed.","Q_Score":14,"Tags":"python,flask","A_Id":50261872,"CreationDate":"2018-05-09T19:58:00.000","Title":"Importing flask.ext raises ModuleNotFoundError","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to run Apache Airflow's webserver from a virtualenv on a Redhat machine, with some configuration options from a Gunicorn config file. Gunicorn and Airflow are both installed in the virtualenv. The command airflow webserver starts Airflow's webserver and the Gunicorn server. The config file has options to make sure Gunicorn uses\/accepts TLSv1.2 only, as well as a list of ciphers to use. \nThe Gunicorn config file is gunicorn.py. This file is referenced through an environment variable GUNICORN_CMD_ARGS=\"--config=\/path\/to\/gunicorn.py ...\" in .bashrc. This variable also sets a couple of other variables in addition to --config. However, when I run the airflow webserver command, the options in GUNICORN_CMD_ARGS are never applied. \nSeeing as how Gunicorn is not called from command line, but instead by Airflow, I'm assuming this is why the GUNICORN_CMD_ARGS environment variable is not read, but I'm not sure and I'm new to both technologies...\nTL;DR:\nIs there another way to set up Gunicorn to automatically reference a config file, without the GUNICORN_CMD_ARGS environment variable? \nHere's what I'm using:\n\ngunicorn 19.8.1\napache-airflow 1.9.0\npython 2.7.5","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2243,"Q_Id":50264760,"Users Score":1,"Answer":"When Gunicorn is called by Airflow, it uses ~\\airflow\\www\\gunicorn_config.py as its config file.","Q_Score":1,"Tags":"python,virtualenv,config,gunicorn,airflow","A_Id":50646740,"CreationDate":"2018-05-10T02:52:00.000","Title":"Apache Airflow: Gunicorn Configuration File Not Being Read?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am from R background where we can use Plumber kind tool which provide visualization\/graph as Image via end points so we can integrate in our Java application.\nNow I want to integrate my Python\/Juypter visualization graph with my Java application but not sure how to host it and make it as endpoint. Right now I using AWS sagemaker to host Juypter notebook","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":75,"Q_Id":50271174,"Users Score":1,"Answer":"Amazon SageMaker is a set of different services for data scientists. You are using the notebook service that is used for developing ML models in an interactive way. The hosting service in SageMaker is creating an endpoint based on a trained model. You can call this endpoint with invoke-endpoint API call for real time inference. \nIt seems that you are looking for a different type of hosting that is more suitable for serving HTML media rich pages, and doesn\u2019t fit into the hosting model of SageMaker. A combination of EC2 instances, with pre-built AMI or installation scripts, Congnito for authentication, S3 and EBS for object and block storage, and similar building blocks should give you a scalable and cost effective solution.","Q_Score":0,"Tags":"python,amazon-sagemaker","A_Id":50300373,"CreationDate":"2018-05-10T10:48:00.000","Title":"How to make a Python Visualization as service | Integrate with website | specially sagemaker","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am building REST API with Flask-restplus. One of my endpoints takes a file uploaded from client and run some analysis. The job uses up to 30 seconds. I don't want the job to block the main process. So the endpoint will return a response with 200 or 201 right away, the job can still be running. Results will be saved to database which will be retrieved later.\nIt seems I have two options for long-running jobs. \n\nThreading\nTask-queue\n\nThreading is relatively simpler. But problem is, there is a limit of thread numbers for Flask app. In a standalone Python app, I could use a queue for the threads. But this is REST api, each request call is independent. I don't know if there is a way to maintain a global queue for that. So if the requests exceed the thread limit, it won't be able to take more requests.\nTask-queue with Celery and Redis is probably better option. But this is just a proof of concept thing, and time line is kind of tight. Setting up Celery, Redis with Flask is not easy, I am having lots of trouble on my dev machine which is a Windows. It will be deployed on AWS which is kind of complex. \nI wonder if there is a third option for this case?","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":15984,"Q_Id":50275646,"Users Score":2,"Answer":"Celery is a fantastic solution to this problem I have used quite successfully in the past to manage millions of jobs per day.\nThe only real downside is the initial learning curve and complexity of debugging when things go sour (it can happen, especially with millions of jobs).","Q_Score":14,"Tags":"python,multithreading,flask,queue,celery","A_Id":52320299,"CreationDate":"2018-05-10T14:46:00.000","Title":"How do I run background job in Flask without threading or task-queue","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it possible to get list of all created rooms in Django channels 2.x?\nI have checked documentation and there is no method which returns list of created rooms.","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1312,"Q_Id":50282878,"Users Score":0,"Answer":"There isn't a built in way for Channels to get a list of groups but you can achieve this by adding\/removing group names to a model field with some logic in your consumer's connect() and disconnect() methods.","Q_Score":1,"Tags":"python,django","A_Id":50283013,"CreationDate":"2018-05-10T23:28:00.000","Title":"Get list of all rooms (Django channels 2)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a virtualenv environment running python 3.5\nToday, when I booted up my MacBook, I found myself unable to install python packages for my Django project. I get the following error:\n\nCould not fetch URL <package URL>: There was a problem confirming the ssl certificate: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:646) - skipping\n\nI gather that TLS 1.0 has been discontinued, but from what I understand, newer versions of Python should be using TLS1.2, correct? Even outside of my environment, running pip3 trips the same error. I've updated to the latest version of Sierra and have updated Xcode as well. Does anyone know how to resolve this?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":105,"Q_Id":50284838,"Users Score":1,"Answer":"Here is the fix:\ncurl https:\/\/bootstrap.pypa.io\/get-pip.py | python\nExecute from within the appropriate virtual environment.","Q_Score":0,"Tags":"python,django,macos","A_Id":50379383,"CreationDate":"2018-05-11T04:04:00.000","Title":"Python - Enable TLS1.2 on OSX","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an include statement with lots of variables being passed in.\nWas wondering if there was any way to make it multiline.\nEx:{% include 'foo.html' with img_src='bar.jpg' img_text='baz' %}\ninto {% include 'foo.html' with \nimg_src='bar.jpg' \nimg_text='baz' %}.","AnswerCount":1,"Available Count":1,"Score":-0.1973753202,"is_accepted":false,"ViewCount":352,"Q_Id":50295892,"Users Score":-1,"Answer":"I'm sorry but you can not do that. The idea is to obtain the template as clean as possible.\nIf the problem is just a visual problem, you can not do that. If the problem is that the code grows and is difficult to maintain and is not verbose, may be necessary to rethink the variables.\nIn the view you can implement get_context_data and send an dict with the src and text. You get now only one variable.","Q_Score":1,"Tags":"python,django","A_Id":50296716,"CreationDate":"2018-05-11T15:47:00.000","Title":"How to have a multi line statement in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using flask with WTForms to create online form. In this form I have a section where user has 10 dropdown menus (with same content; they need to rank items). I'd like to ensure that the same item is not selected multiple times. However, I can't find a way to do so. In WTForms there is a validator Equals() which checks if the field equals to another field, but no such validator to check if it does not equal. \nAny help would be appreciated.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":45,"Q_Id":50296012,"Users Score":0,"Answer":"You can write your own validator and use it as you wish.","Q_Score":0,"Tags":"python,flask-wtforms","A_Id":50296592,"CreationDate":"2018-05-11T15:54:00.000","Title":"Python Flask WTForms ensure uniqueness of a field","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"This question specifically aims for a Django 2.0 answer as the registration module isn't available (yet) for it.\nMore, this might seem to broad, but I often found myself in situations where I can't use any 3rd party module because ... oh well..policies. I'm sure many did. And I know that looking and putting together information taken from here or django docs was a headache.\n\nWorkflow:\nLet's suppose we need the following flow:\n\nThe user goes to the sign-up page and fills in the following fields: first_name, last_name and email (the email will be used as the username).\nThe user submits the form and receives a confirmation email with an URL containing a unique token.\nWhen the user clicks on the received link, he's redirected to a page where he'll set his password. When done, he's logged in to the dashboard page.\n\nExtra-info: The user will later log in by using his email (which is actually his username) and password.\n\nSpecific question:\n\nHow will the models\/views (using CBVs)\/forms\/urls look like?","AnswerCount":3,"Available Count":1,"Score":0.1325487884,"is_accepted":false,"ViewCount":14138,"Q_Id":50298114,"Users Score":2,"Answer":"In addition to Peter's answer, if you are using Django 2 then the encoding and decoding parts are a bit differents.\nEncoding :\nChange 'uid': urlsafe_base64_encode(force_bytes(user.pk)),\nTo 'uid': urlsafe_base64_encode(force_bytes(user.pk)).decode(),\nDecoding :\nChange uid = force_text(urlsafe_base64_decode(uidb64))\nTo uid = urlsafe_base64_decode(uidb64).decode()\nDjango 3 Edit :\nEncoding : uid = urlsafe_base64_encode(force_bytes(user.pk))\nDecoding : uid = urlsafe_base64_decode(uidb64).decode()","Q_Score":21,"Tags":"python,django,authentication","A_Id":53433216,"CreationDate":"2018-05-11T18:20:00.000","Title":"Django 2 - How to register a user using email confirmation and CBVs?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am currently working on a project that would allow me to serve a web page to multiple local devices and use each client as controls for Pygame input. I am having trouble finding out if I can even pass data in-between the two (Pygame and flask) let alone having them run side by side using something like async. (Please note i am just getting started digging into python programming). I was thinking of two ways that this could happen if it is possible to have them communicate.. \n1) Use flask to pass the data to Pygame.\n2) Use something like Brython to run python localy on the device via browser and connect them using sockets.\nIs it possible or is this just a pipe dream?\nThanks,","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":154,"Q_Id":50299695,"Users Score":0,"Answer":"This is not possible.\nPyGame is intended for rendering graphics on the computer running the Python binary, while Flask is intended to generate HTML to be sent to a remote computer. The only way to interact with a remote user through a browser is through HTML and JavaScript.\nMoreover, this there is no way to interface PyGame with HTML\/JS because PyGame's method of accessing the local screen, keyboard and mouse is very different from HTML's method of interacting with the user. To give just one major obstacle, PyGame's fundamental mode of operation is to block the UI thread until an event (such as a mouse click) occurs, using the function pygame.event.wait(). In HTML, by contrast, this is not allowed, and you are expected instead to register handlers for events such as mouse clicks.","Q_Score":1,"Tags":"python,html,asynchronous,flask,pygame","A_Id":64150040,"CreationDate":"2018-05-11T20:18:00.000","Title":"Using python generated web page as input for Pygame controls","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I installed python3 to my my late 2014 iMac through brew.sh and my terminal is still defaulting to an older version of python unless I specifically prompt it with the command python3.  Is there any way I can fix this so that the terminal just automatically defaults to python3, without me having to type in python3 every single time?  I really need to run django, and the fact that my system is still defaulting to python 2.7 is really getting in the way.  Is there perhaps any way I can uninstall the older version of python?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":14,"Q_Id":50299956,"Users Score":0,"Answer":"Yes, you should set up virtual environments for python 2.7.13 and python 3.6. when you want to run python2, just activate the python 2 environments. Same for python3.\nIf you installed python using Anaconda, there are instructions in the Anaconda documentation for creating virtual environments.\nIf you did not use Anaconda, you can find instructions for creating virtual environments by googling on 'virtual environment python' and there are many hits.\nI would advise against deleting any version of python. Macs come with a version of python installed that it uses and should not be removed.","Q_Score":0,"Tags":"python-3.x,macos,installation","A_Id":50302596,"CreationDate":"2018-05-11T20:39:00.000","Title":"Python 3 installation","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"I know my question sounds like a duplicate, but I've looked everywhere without finding any solution.\nI am working on implementing social logins for my django webapp. So far google, twitter and yahoo logins have worked as expected. But facebook always gives the error below:\nURL blocked: This redirect failed because the redirect URI is not white-listed in the app's client OAuth settings. Make sure that the client and web OAuth logins are on and add all your app domains as valid OAuth redirect URIs.\nAfter some digging I got to learn how to setup my facebook login properly: Facebook app settings below\nApp Domains set to domain.ext\nSite URL set to https:\/\/www.domain.ext\/\nValid OAuth Redirect URIs set to https:\/\/domain.ext\/social\/complete\/facebook\/\nI also looked at the redirect url (shown below) and found that it contains a state variable, state=kMQH3TdKSdF8oYGGx7Xri4KgFaEQ9OyU. Full url below\nhttps:\/\/www.facebook.com\/v2.9\/dialog\/oauth?client_id=977674249054153&redirect_uri=https%3A%2F%2Fwww.domain.ext%2Fsocial%2Fcomplete%2Ffacebook%2F&state=kMQH3TdKSdF8oYGGx7Xri4KgFaEQ9OyU&return_scopes=true&scope=email%2Cpublic_profile\nMy facebook login url on my django app is {% url 'social:begin' 'facebook' %} and I have this 'social_core.backends.facebook.FacebookOAuth2' in AUTHENTICATION_BACKENDS\nI searched and found there's such issue already on the social-core github page which has been resolved. It says that from v1.7.0, this line REDIRECT_STATE = False has been added to the facebook backend. I dug into the sourcecode and found that to be the case. But my app's url keep sending the state variable and I have no idea why that is the case. Please has someone else encountered this odd behaviour, and if yes how did you go about working it out?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1285,"Q_Id":50363059,"Users Score":0,"Answer":"Have you tried django-allauth? I find it to be a much better solution. It takes care of third party provider integration for you with builtin support for many providers and custom providers.","Q_Score":3,"Tags":"python,django,python-social-auth,django-socialauth","A_Id":50363382,"CreationDate":"2018-05-16T05:30:00.000","Title":"social-auth-app-django facebook backend state with redirect_uri","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I know my question sounds like a duplicate, but I've looked everywhere without finding any solution.\nI am working on implementing social logins for my django webapp. So far google, twitter and yahoo logins have worked as expected. But facebook always gives the error below:\nURL blocked: This redirect failed because the redirect URI is not white-listed in the app's client OAuth settings. Make sure that the client and web OAuth logins are on and add all your app domains as valid OAuth redirect URIs.\nAfter some digging I got to learn how to setup my facebook login properly: Facebook app settings below\nApp Domains set to domain.ext\nSite URL set to https:\/\/www.domain.ext\/\nValid OAuth Redirect URIs set to https:\/\/domain.ext\/social\/complete\/facebook\/\nI also looked at the redirect url (shown below) and found that it contains a state variable, state=kMQH3TdKSdF8oYGGx7Xri4KgFaEQ9OyU. Full url below\nhttps:\/\/www.facebook.com\/v2.9\/dialog\/oauth?client_id=977674249054153&redirect_uri=https%3A%2F%2Fwww.domain.ext%2Fsocial%2Fcomplete%2Ffacebook%2F&state=kMQH3TdKSdF8oYGGx7Xri4KgFaEQ9OyU&return_scopes=true&scope=email%2Cpublic_profile\nMy facebook login url on my django app is {% url 'social:begin' 'facebook' %} and I have this 'social_core.backends.facebook.FacebookOAuth2' in AUTHENTICATION_BACKENDS\nI searched and found there's such issue already on the social-core github page which has been resolved. It says that from v1.7.0, this line REDIRECT_STATE = False has been added to the facebook backend. I dug into the sourcecode and found that to be the case. But my app's url keep sending the state variable and I have no idea why that is the case. Please has someone else encountered this odd behaviour, and if yes how did you go about working it out?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":1285,"Q_Id":50363059,"Users Score":0,"Answer":"I've spent hours on this issue, but it turns out I only needed to do this Valid OAuth Redirect URIs set to https:\/\/www.domain.ext\/social\/complete\/facebook\/\nNote the www.","Q_Score":3,"Tags":"python,django,python-social-auth,django-socialauth","A_Id":50364398,"CreationDate":"2018-05-16T05:30:00.000","Title":"social-auth-app-django facebook backend state with redirect_uri","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to write an application which is portable.\nWith \"portable\" I mean that it can be used to access these storages:\n\namazon s3\ngoogle cloud storage\nEucalyptus Storage\n\nThe software should be developed using Python.\nI am unsure how to start, since I could not find a library which supports all three storages.","AnswerCount":3,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":225,"Q_Id":50364766,"Users Score":3,"Answer":"You can use boto3 for accessing any services of Amazon.","Q_Score":7,"Tags":"python,amazon-s3,google-cloud-storage,portability","A_Id":50364799,"CreationDate":"2018-05-16T07:28:00.000","Title":"Portable application: s3 and Google cloud storage","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I run my pyspark program in vscode, and get error:\nPicklingError: Could not serialize object: ImportError: No module named visualstudio_py_debugger .\nI suppose it has something to do with my vscode setting?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":185,"Q_Id":50367947,"Users Score":0,"Answer":"Somehow your code is trying to pickle the debugger itself. Do make sure you are running the debugger using the PySpark configuration.","Q_Score":0,"Tags":"python,pyspark,visual-studio-code","A_Id":50518560,"CreationDate":"2018-05-16T10:05:00.000","Title":"get vscode python error when run pyspark program using vs code","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using python flask framework for an object detection task. I have set threaded=Trueand multiple requests are handled well. As the detection process uses more processing power and time, I need to control the number of background threads to a certain limit. As of my knowledge, OS can manage the number of threads. But I need to limit the thread count to 4 or 5 and provide a server busy result if the request is overloaded. How can I achieve this?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2387,"Q_Id":50370225,"Users Score":3,"Answer":"When using threaded true, the number of threads will be depend on the system configuration. You need to use any production environment like gunicorn for this as flask is not supporting production environment officially. Limiting of thread count using flask is also very hard to execute.","Q_Score":1,"Tags":"python,multithreading,flask","A_Id":50737176,"CreationDate":"2018-05-16T11:52:00.000","Title":"Python Flask: How to control the number of background threads","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"This a question about architecture. Say I have a long running process on a server such as machine learning in a middle of a training. Now as this run on external machine I would like to have a tool to quickly see from time to time the results. So I thought the best way would be to have a website which quickly connects to the process for example using RPC to display the results as this allows me to always check in. Now the question is how should Django view gather the information from the server process:\n1) Using RPC calls such as rpyc directly in the views?\n2) Using some kind of messaging queue such as celery ?\n3) Or in a completely different way I am not seeing ?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":157,"Q_Id":50381129,"Users Score":0,"Answer":"There's at least 2 possible ways to do this.\n\nImplement your data-refreshing function as a view and visit it by ajax(sync)+javascript timer.Since you visit your page that contains these js, it will fetch your data silently and update the page. However,this solution does not work well when you need to record all the data in a given frequency;the ajax\/view only executes when the web page is open.\nUse messaging queue like selcuk suggests.Alongside celery, APscheduler is also a good choice because it's easier to install and use.You can implement a task(as modal) queue with status(queue\/done\/stoped\/whatever as field) and check them at the frequency you wanted,save the date you retrieved and do all the other stuff.","Q_Score":0,"Tags":"python,django,ipc,rpc","A_Id":50385869,"CreationDate":"2018-05-16T23:04:00.000","Title":"Using Django as GUI for long running python process","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a model with some charField called custom_id.\nI am generating this ID randomly, and check if already exists in database before assigning it.\nSo all my custom_ids are unique.\nHowever if I delete some entry from the database. The custom_id will become available again. I want to prevent that. I want the custom_id not to be ever usable again.\nHow is that possible ? Is there a clean way to achieve that ?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":42,"Q_Id":50386923,"Users Score":0,"Answer":"You can write your code in a try-catch block.\nsince the custom_id field is unique, while inserting into DB it will throw integrity error if custom id already exists. \nYou can do whatever you want in catch block custom_id is already exist.","Q_Score":0,"Tags":"python,django","A_Id":50387047,"CreationDate":"2018-05-17T08:37:00.000","Title":"How to ensure some custom ID has not been created already in the past?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have installed face_recognition model using command\n\npip3 install face_recognition\n\nand it is installed in my AWS instance. But while importing face_recognition in my jupyter notebook it is giving me import error.\nThanks","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":37,"Q_Id":50392373,"Users Score":0,"Answer":"Are you using a python environment? you have to make sure that the python interpreter that is running your code is the same one that has the face_recognition requirement installed.","Q_Score":0,"Tags":"python,amazon-ec2,pip","A_Id":50401446,"CreationDate":"2018-05-17T13:12:00.000","Title":"Not able to use installed libraries","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I work for a company in a department where I have been asked to create a form or document that managers can go into to submit team changes for an employee. employees can support different teams month over month within the business. my goal is to build a form or application in which managers can go in, choose an employee from a given list and select a team name, as well as an effective date of the change. my question is what can i use to build such a tool where i can gather data input and also have it stored somewhere for my reference. the current limitations are that we don't have our own SQL server and because it is a large bank i don't see us being able to create a web page or anything. Any advice?","AnswerCount":1,"Available Count":1,"Score":0.537049567,"is_accepted":false,"ViewCount":54,"Q_Id":50402840,"Users Score":3,"Answer":"There is a lot to unpack from your question.  I've created several apps with forms for CRUD using Flask with SQLite. SQLite is a free and simple one file database with very low maintenance overhead.  Flask is a dead simple to get started yet has many specific packages available to create sophisticated apps.  Tons of documentation and support on the web and youtube.  You can create a prototype on your own machine then use an internal Linux server or better yet, a cloud provider like pythonanywhere.com or digitalocean.com once you want to share your app with others in your company.  I strongly encourage anyone taking this path to learn how to use virtual environment and git\/GitHub before getting started.","Q_Score":1,"Tags":"python,sql,sql-server,python-3.x,forms","A_Id":50403315,"CreationDate":"2018-05-18T02:11:00.000","Title":"How to create an internal web form\/application to gather user input and store it","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a web application build out of Django version 2.0.1\nA user uploads a file, and based on the content, there are tasks which are executed in a serial fashion. After execution the results are shown to the user. Some of the tasks are independent of each other. \nI want to execute the independent tasks in parallel. I tried using multiprocessing within views.py but there are some errors thrown when the processes are spawned. These tasks analyse some information and write to a file. The files are then combined to show the results to the user.\nThese tasks cannot be done asynchronous as the results produced needs to be shown to the user waiting. So I have dropped the idea of using Celery as recommended in other discussions. \nAnyone's suggestions would be helpful.\nThanks\nError got\nThis was the error we gotTraceback (most recent call last):\n  C:\\Users\\idea\\AppData\\Local\\Enthought\\Canopy\\edm\\envs\\python\\lib\\multiprocessing\\spawn.py\", line 106, in spawn_main\n    exitcode = _main(fd)\n  File \"C:\\Users\\idea\\AppData\\Local\\Enthought\\Canopy\\edm\\envs\\python\\lib\\multiprocessing\\spawn.py\", line 116, in _main\n    self = pickle.load(from_parent)\n  File \"G:\\work\\gitrepo\\suprath-github\\smartdata\\ssd\\FinalPlots\\uploads\\core\\views.py\", line 6, in \n    from uploads.core.models import Document\n  File \"G:\\work\\gitrepo\\suprath-github\\smartdata\\ssd\\FinalPlots\\uploads\\core\\models.py\", line 7, in \n    class Document(models.Model):\n  File \"C:\\Users\\idea\\AppData\\Local\\Enthought\\Canopy\\edm\\envs\\python\\lib\\site-packages\\django\\db\\models\\base.py\", line 100, in new\n    app_config = apps.get_containing_app_config(module)\n  File \"C:\\Users\\idea\\AppData\\Local\\Enthought\\Canopy\\edm\\envs\\python\\lib\\site-packages\\django\\apps\\registry.py\", line 244, in get_containing_app_config\n    self.check_apps_ready()\n  File \"C:\\Users\\idea\\AppData\\Local\\Enthought\\Canopy\\edm\\envs\\python\\lib\\site-packages\\django\\apps\\registry.py\", line 127, in check_apps_ready\n    raise AppRegistryNotReady(\"Apps aren't loaded yet.\")\ndjango.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet.\nTraceback (most recent call last):","AnswerCount":2,"Available Count":2,"Score":0.1973753202,"is_accepted":false,"ViewCount":643,"Q_Id":50405413,"Users Score":2,"Answer":"These tasks cannot be done asynchronous as the results produced needs to be shown to the user waiting\n\nThat doesn't mean you can't use an async queue (celery or other). We have a very similar use case and do use celery to run the tasks. The tasks (part parallel, part serial) store their progress in redis, and the frontend polls to get the current state and display progress to the user, then when the whole process is done (either successfuly or not) we display the result (or errors).","Q_Score":1,"Tags":"python,django,python-multiprocessing","A_Id":50406016,"CreationDate":"2018-05-18T06:52:00.000","Title":"Django: running a few tasks in parallel","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a web application build out of Django version 2.0.1\nA user uploads a file, and based on the content, there are tasks which are executed in a serial fashion. After execution the results are shown to the user. Some of the tasks are independent of each other. \nI want to execute the independent tasks in parallel. I tried using multiprocessing within views.py but there are some errors thrown when the processes are spawned. These tasks analyse some information and write to a file. The files are then combined to show the results to the user.\nThese tasks cannot be done asynchronous as the results produced needs to be shown to the user waiting. So I have dropped the idea of using Celery as recommended in other discussions. \nAnyone's suggestions would be helpful.\nThanks\nError got\nThis was the error we gotTraceback (most recent call last):\n  C:\\Users\\idea\\AppData\\Local\\Enthought\\Canopy\\edm\\envs\\python\\lib\\multiprocessing\\spawn.py\", line 106, in spawn_main\n    exitcode = _main(fd)\n  File \"C:\\Users\\idea\\AppData\\Local\\Enthought\\Canopy\\edm\\envs\\python\\lib\\multiprocessing\\spawn.py\", line 116, in _main\n    self = pickle.load(from_parent)\n  File \"G:\\work\\gitrepo\\suprath-github\\smartdata\\ssd\\FinalPlots\\uploads\\core\\views.py\", line 6, in \n    from uploads.core.models import Document\n  File \"G:\\work\\gitrepo\\suprath-github\\smartdata\\ssd\\FinalPlots\\uploads\\core\\models.py\", line 7, in \n    class Document(models.Model):\n  File \"C:\\Users\\idea\\AppData\\Local\\Enthought\\Canopy\\edm\\envs\\python\\lib\\site-packages\\django\\db\\models\\base.py\", line 100, in new\n    app_config = apps.get_containing_app_config(module)\n  File \"C:\\Users\\idea\\AppData\\Local\\Enthought\\Canopy\\edm\\envs\\python\\lib\\site-packages\\django\\apps\\registry.py\", line 244, in get_containing_app_config\n    self.check_apps_ready()\n  File \"C:\\Users\\idea\\AppData\\Local\\Enthought\\Canopy\\edm\\envs\\python\\lib\\site-packages\\django\\apps\\registry.py\", line 127, in check_apps_ready\n    raise AppRegistryNotReady(\"Apps aren't loaded yet.\")\ndjango.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet.\nTraceback (most recent call last):","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":643,"Q_Id":50405413,"Users Score":0,"Answer":"I agree with the solution provided by @bruno desthuillieres, however, you can implement some socket solution to reach back to the user.\nSince polling from user may have huge performance impacts, the socket solution will ideal for this case.","Q_Score":1,"Tags":"python,django,python-multiprocessing","A_Id":50420302,"CreationDate":"2018-05-18T06:52:00.000","Title":"Django: running a few tasks in parallel","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Hi I want to set  filter on field date where the value of date field should within 24 hours.\n<filter name=\"date\" string=\"Scheduled Date\" domain=\"[('date', '&gt;=', datetime.datetime.now().strftime('%Y-%m-%d 00:00:00')),('date', '&lt;=', datetime.datetime.now().strftime('%Y-%m-%d 23:23:59'))]\"\/>\nI tried this one, but this retrieves only the data where the date field contains today's date\nThanks in advance","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":594,"Q_Id":50423340,"Users Score":1,"Answer":"For this you can also use schedule action. Within scheduler action you can define you method with appropriate setting.","Q_Score":1,"Tags":"xml,python-2.7,odoo,odoo-10","A_Id":50522243,"CreationDate":"2018-05-19T08:30:00.000","Title":"How to set filter on a field to get data within 24 hours?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a django application and a mysql database table having around 30,000 entries. \nI have to process each entry one by one, do some computation and store the result   in database.\nWhen I start processing, the time taken to process 100 entries is around 40 seconds. But this time keeps on growing. So after processing 1000 entries, the time goes to 1 minute, then after processing 2000 entries, the time to compute 100 entries move to 1 minute 30 seconds. \nIf I stop the server, and start computing again from say 2000th entry, then the time taken to process 100 entries becomes 40 seconds again, but keeps on increasing as more entries are processed.\nDoes anyone know why is this happening?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":48,"Q_Id":50429609,"Users Score":0,"Answer":"Sounds like you need an index.\nDon't process one row at a time; use SQL to process all rows 'simultaneously'.  Describe the processing; we may be able to get more specific.","Q_Score":0,"Tags":"python,mysql,django,performance","A_Id":50498291,"CreationDate":"2018-05-19T21:23:00.000","Title":"Django queries gets slower over time","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am getting an below error while running manage.py run server.\nDirectory: C:\\Users\\home\\Desktop\\website_dj>ls\n557 manage.py\nPS C:\\Users\\home\\Desktop\\website_dj> python manage.py runserver\nImportError: No module named 'website_dj'","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":67,"Q_Id":50432712,"Users Score":0,"Answer":"Have you registered 'website_dj' in your installed apps in settings.py?","Q_Score":0,"Tags":"python,django,powershell,pycharm","A_Id":50435928,"CreationDate":"2018-05-20T07:44:00.000","Title":"ImportError: No module named \"webisite_dj\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am starting my own Django-Oscar project, and am wondering about the possibility of changing the location of the 'oscar'-directory (containing all apps, a models.py etc), moving it from the default on-installation site-packages directory within my virtual environment - into my project root directory. \nWould it be possible to simply copy the 'oscar'-directory, and paste it into a new location, assuming I also change the locations of the 'INSTALLED_APPS', and make sure that my project-structure is the same (i.e. not changing things like the directory-name 'oscar' so that imports etc break)? If so, would that mean that I could delete it all together from site-packages (DRY-solution)? \nThis would mimic the sandbox-installation, and would be a set up I'd feel more comfortable with as a beginner who needs visible overhead. \nThank you!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":165,"Q_Id":50433131,"Users Score":1,"Answer":"Yes, you can do that. Although, it's not recommended, because then it'd be harder for you to incorporate latest oscar changes into your project, and it's not the recommended way to customize \/ extend oscar functionality.\nInstead of deleting oscar from site-packages you should rather pip uninstall django-oscar.\nAlso, it's possible to have oscar installed, as well as copied into your project directory at the same time. By Python defaults, the one in your project directory would be the one that will get imported (instead of the installed). This way, you can have the comfort of working with it locally. I sometimes do this so that I can safely test certain django apps (like oscar) with minor changes (in development environment), but not having to commit \/ push these changes into a production environment mostly because it's easier this way than following recommended methods to extend the app.","Q_Score":1,"Tags":"python,django,django-oscar,site-packages","A_Id":50437287,"CreationDate":"2018-05-20T08:47:00.000","Title":"Django: Moving 'oscar' site-package","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Typically when using rubygems in the ruby ecosystem or npm\/yarn in the JavaScript ecosystem packages are installed somewhere on the $PATH or at least you are instructed to add the package install location to your path $PATH.\nIt seems like with pip in the python ecosystem there is never an emphasis on this. Instead, you are encouraged to run modules via python -m <name>, etc.\nSeems a bit odd to me, was this just a design decision? Is it good practice to put site-packages or whatever location pip is using into $PATH? Sometimes a binary is added to \/usr\/local\/bin (and sometimes with a different name than the package itself e.g django-admin instead of django with pip install Django whereas the binary is usually the same as the package name in ruby\/JavaScript ecosystems), for example, I see, but is that all of the time?","AnswerCount":2,"Available Count":2,"Score":0.1973753202,"is_accepted":false,"ViewCount":4966,"Q_Id":50437251,"Users Score":2,"Answer":"The site-packages directory for a particular python installation is automatically added to sys.path when you run the binary for the installation.  When that binary executes import modname, it looks in the directories on sys.path.  So when you run pip install with a particular python binary, pip, by default, puts the package in the site-packages for that binary so that binary can import the package.  Advanced used can do more complicated things.","Q_Score":3,"Tags":"python,path,pip,environment,package-managers","A_Id":50437417,"CreationDate":"2018-05-20T16:53:00.000","Title":"Why are pip packages not installed to $PATH to by default?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Typically when using rubygems in the ruby ecosystem or npm\/yarn in the JavaScript ecosystem packages are installed somewhere on the $PATH or at least you are instructed to add the package install location to your path $PATH.\nIt seems like with pip in the python ecosystem there is never an emphasis on this. Instead, you are encouraged to run modules via python -m <name>, etc.\nSeems a bit odd to me, was this just a design decision? Is it good practice to put site-packages or whatever location pip is using into $PATH? Sometimes a binary is added to \/usr\/local\/bin (and sometimes with a different name than the package itself e.g django-admin instead of django with pip install Django whereas the binary is usually the same as the package name in ruby\/JavaScript ecosystems), for example, I see, but is that all of the time?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":4966,"Q_Id":50437251,"Users Score":2,"Answer":"You're confusing $PATH and $PYTHONPATH. site-packages is for libraries,  $PATH is for programs (binaries and scripts). pip installs libraries into its site-packages and scripts to the corresponding bin\/ directory; e.g. if site-packages is \/usr\/local\/lib\/pythonX.Y\/site-packages scripts are installed into \/usr\/local\/bin\/.\npip doesn't check if \/usr\/local\/bin\/is in $PATH. Well, I agree with you \u2014 it should check and remind user to add bin\/ directory to $PATH if it's not already there.","Q_Score":3,"Tags":"python,path,pip,environment,package-managers","A_Id":50438937,"CreationDate":"2018-05-20T16:53:00.000","Title":"Why are pip packages not installed to $PATH to by default?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Recently, I decided to use Django-summernote to edit model-form text fields. I can use the editor without any problem. When it comes to rendering output of the text edited with this tool, it displays with html tags. Looked around a while but not found any solution. \nAny thoughts on this?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":740,"Q_Id":50440350,"Users Score":1,"Answer":"Make sure that you're including the |safe filter on the content (and that you trust the content to be, in fact, safe).","Q_Score":2,"Tags":"python,django,rich-text-editor,summernote","A_Id":50440540,"CreationDate":"2018-05-20T23:40:00.000","Title":"Django-summernote works properly, but shows text with HTML tags","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have built a chatbot using AWS Lex and lambda. I have a use case where in a user enters a question (For example: What is the sale of an item in a particular region). I want that once this question is asked, a html form\/pop up appears that askes the user to select the value of region and item from dropdown menus and fills the slot of the question with the value selected by the user and then return a response. Can some one guide how can this be achieved? Thanks.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":224,"Q_Id":50447302,"Users Score":0,"Answer":"Lex has something called response cards where your can add all the possible values. These are called prompts. The user can simply select his\/her choice and the slot gets filled. Lex response cards work in Facebook and slack. \nIn case of custom channel, you will have to custom develop the UI components.","Q_Score":0,"Tags":"python-3.x,amazon-web-services,aws-lambda,chatbot,amazon-lex","A_Id":50462554,"CreationDate":"2018-05-21T10:54:00.000","Title":"Using aws lambda to render an html page in aws lex chatbot","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have string like in main.py:\n    mystring=\"<ol><li>shiva<\/li><li>putra<\/li>\"\nand i want this value to display to in index.html using python webapp2. i have called {{mystring}}\nNow it is displaying as it is i.e: <ol><li>shiva<\/li><li>putra<\/li>\nBut I want output Like:\n\nshiva\nputra\n\nHow would i display this please help me.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":47,"Q_Id":50447419,"Users Score":1,"Answer":"use safe keyword {{ mystring |safe}} it should work.","Q_Score":1,"Tags":"html,python-2.7,webapp2","A_Id":51671139,"CreationDate":"2018-05-21T10:59:00.000","Title":"i have string containing html tags and i need to display that string in html page in web app2","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a django sitemap and wagtail sitemap for my site.\nThe django sitemap is using https by simply setting the protocol variable in the class, but I can't figure out a way to do this for the wagtail sitemap without overriding many internal methods.\nIs there a simple way to use https for my wagtail sitemaps?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":814,"Q_Id":50471616,"Users Score":15,"Answer":"In the Wagtail admin, under Settings -> Sites, change the port number of your site to 443.","Q_Score":5,"Tags":"python,django,seo,wagtail","A_Id":50473994,"CreationDate":"2018-05-22T15:38:00.000","Title":"How to change protocol to https on wagtail sitemaps?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm testing Apache superset Dashboards, It s a great tool.\nI added an external Database source (Oracle), and I created nice Dashboards very easily.\nI would like to see my Dashboards updated regularly and automatically (3 times a day) in superset.\nBut my Dashboards are not updated.\nI mean when a row is inserted into the Oracle Tables, if I refresh the Dashboard, I cannot view the new data in the Dashboard.\nWhat is the best way to do it ?\n=> Is there a solution \/ an option to force the Datasource to be automatically updated regularly ? in a frequency ? What is the parameter \/ option ? \n=> is there a solution to import in batch csv files (for instance in python), then this operation will update the Dashboard ?\n=> other way ?\nIf you have examples to share... :-)\nMy environment: \nSuperset is Installed on ubuntu 16.04 and Python 2.7.12.\nOracle is installed on another Linux server.\nI connect from  google chrome to Superset.\nMany thanks for your help","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1509,"Q_Id":50472282,"Users Score":0,"Answer":"You could set the auto-refresh interval for a dashboard if you click on the arrow next to the Edit dashboard-button.","Q_Score":1,"Tags":"python,oracle,superset","A_Id":59359358,"CreationDate":"2018-05-22T16:16:00.000","Title":"superset dashboards - dynamic updates","Data Science and Machine Learning":1,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm testing Apache superset Dashboards, It s a great tool.\nI added an external Database source (Oracle), and I created nice Dashboards very easily.\nI would like to see my Dashboards updated regularly and automatically (3 times a day) in superset.\nBut my Dashboards are not updated.\nI mean when a row is inserted into the Oracle Tables, if I refresh the Dashboard, I cannot view the new data in the Dashboard.\nWhat is the best way to do it ?\n=> Is there a solution \/ an option to force the Datasource to be automatically updated regularly ? in a frequency ? What is the parameter \/ option ? \n=> is there a solution to import in batch csv files (for instance in python), then this operation will update the Dashboard ?\n=> other way ?\nIf you have examples to share... :-)\nMy environment: \nSuperset is Installed on ubuntu 16.04 and Python 2.7.12.\nOracle is installed on another Linux server.\nI connect from  google chrome to Superset.\nMany thanks for your help","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":1509,"Q_Id":50472282,"Users Score":1,"Answer":"I just found the origin of my error... :-)\nIn fact I added records in the future (tomorow, the day after, ...)... \nAnd My dashboard was only showing all Records to the today date...\nI inserted a record before, I refreshed and It appeared.\nThanks to having read me...","Q_Score":1,"Tags":"python,oracle,superset","A_Id":50473011,"CreationDate":"2018-05-22T16:16:00.000","Title":"superset dashboards - dynamic updates","Data Science and Machine Learning":1,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am attempting to learn how to create a website using python. I have been going off the advice of various websites including stackoverflow. Currently I can run code in eclipse using pydev, but I need to install django. I have no idea how to do this and I don't know who to ask or where to begin. Please help","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":68,"Q_Id":50478204,"Users Score":0,"Answer":"I would recommend the following:\n\nInstall virtual environment\n\n$pip install virtualenv\n\nCreate a new virtualenvironment\n\n$ virtualenv django-venv\n\nActivate virtual environment & use\n\n$ source django-venv\/bin\/activate\n\nAnd install django as expected\n\n(django-venv)$ pip install django==1.11.13\n(Replace with django version as needed)","Q_Score":0,"Tags":"python,django,eclipse,pydev","A_Id":50478352,"CreationDate":"2018-05-23T00:28:00.000","Title":"I have downloaded eclipse and pydev, but I am unsure how to get install django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My task : I cannot speak openly about what the specifics of my task are, but here is an analogy : every two hours, I get a variable number of spoken audio files. Sometimes only 10, sometimes 800 or more. Let's say I have a costly python task to perform on these files, for example Automatic Speech Recognition. I have a Google Intance managed group that can deploy any number of VMs for executing this task.\nThe issue : right now, I'm using Google PubSub. Every two hours, a topic is filled with audio ids. Instances of the managed group can be deployed depending on the size of queue. The problem is, only one worker get all the messages from the PubSub subscription, while the others are not receiving any, perhaps because the queue is not that long (maximum ~1000 messages). This issue is reported in a few cases in the python Google Cloud github, and it is not clear if it is the intended purpose of PubSub, or just a bug.\nHow could I implement the equivalent of a simple serverless task queue in Python and Google Cloud, and can spawn instances based on a given metric, for example the size of the queue ? Is this the intended purpose of PubSub ?\nThanks in advance.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":442,"Q_Id":50484098,"Users Score":1,"Answer":"In App Engine you can create push queues and set rate\/concurrency limits and Google will handle the rest for you. App Engine will scale as needed (e.g. increase Python instances).  \nIf you're outside of App Engine (e.g. GKE), the pubsub Python client library may be pulling many messages at once. We had a hard time controlling this (for google-cloud-pubsub==0.34.0) as well so we ended up writing a small adjustment on top of  google-cloud-pubsub calling SubscriberClient.pull with max_messages set). The server side pubsub API does adhere to max_messages.","Q_Score":0,"Tags":"python-2.7,google-cloud-platform,google-cloud-pubsub","A_Id":50490692,"CreationDate":"2018-05-23T09:01:00.000","Title":"Simple task queue using Google Cloud Platform : issue with Google PubSub","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"i have a webservice which gets user requests and produces (multiple) solution(s) to this request.\nI want to return a solution as soon as possible, and send the remaining solutions when they are ready.\nIn order to do this, I thought about using Django's Http stream response. Unfortunately, I am not sure if this is the most adequate way of doing so, because of the problem I will describe below.\nI have a Django view, which receives a query and answers with a stream response. This stream returns the data returned by a generator, which is always a python dictionary.\nThe problem is that upon the second return action of the stream, the Json content breaks.\nIf the python dictionary, which serves as a response, is something like {key: val}, after the second yield the returned response is  {key: val} {key: val}, which is not valid Json.\nAny suggestions on how to return multiple Json objects at different moments in time?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":928,"Q_Id":50491360,"Users Score":0,"Answer":"Try decoding with something like \nfor example \n\n\n\nimport json\njson.dumps( {key: val} {key: val}, separators=('}', ':'))  #check it","Q_Score":1,"Tags":"python,json,django","A_Id":58790635,"CreationDate":"2018-05-23T14:46:00.000","Title":"Proper way of streaming JSON with Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I know there is a method where you can call a stored process via the SAS Stored Process Web Application, but I was wondering if there is a method where i can call the stored process server directly.\nThe goal is to call a stored process which delivers data (via the _webout file?) to python, as efficiently as possible. So maybe it could reduce processing time by skipping the SAS Web Application.\nI don't think it is possible with SASPy (seems to be using Workspace servers).\nRegards.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":461,"Q_Id":50492155,"Users Score":1,"Answer":"There are 2 ways to call a stored process server in code, using the Java libraries and using the .NET libraries.\nPersonally, I have used .NET to create a command line application that calls the stored process and returns the stream to STDOUT.  From Python, you just read that output.  You can replicate this from Java (but the .NET libraries are easier to use).\nThe other method would be to use a library that allows you to call Java from your flavor of Python (or .NET if you are using the MS Python) and integrate it that way.\nIn the end, for most use cases, it is just easier to use the STP Web Application.  You can log in once, store the authorization token, and pass that back, negating the overhead of re-logging in for each call.","Q_Score":2,"Tags":"python,sas,sas-stored-process,saspy","A_Id":50492460,"CreationDate":"2018-05-23T15:25:00.000","Title":"Execute SAS Stored Process with Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm quite familiar with Django, but recently noticed there exists a on_delete=models.CASCADE and on_delete=models.PROTECT options with the models,\n\non_delete=models.CASCADE and on_delete=models.PROTECT both are doing same things.\nOr both are same (I used the only on_delete=models.CASCADE, when I remove the parent entry it will remove all related entries )\nI have searched for the documentation for the same but couldn't find anything more than:\n\n\nDjango 2.0\nA many-to-one relationship. Requires two positional arguments: the\n  class to which the model is related and the on_delete option.\n       To create a recursive relationship \u2013 an object that has a many-to-one relationship with itself \u2013 use models.ForeignKey('self',\n  on_delete=models.CASCADE).","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":27010,"Q_Id":50502537,"Users Score":49,"Answer":"CASCADE\nCascade deletes. Django emulates the behavior of the\nSQL constraint ON DELETE CASCADE and also deletes the object\ncontaining the ForeignKey.\nPROTECT \nPrevent deletion of the referenced object by raising\nProtectedError, a subclass of django.db.IntegrityError.\n\nthe things get deleted because once you change your model you need to do makemigrations and migrate to see the change.","Q_Score":26,"Tags":"python,django,django-models","A_Id":50502731,"CreationDate":"2018-05-24T06:37:00.000","Title":"what does on_delete=models.PROTECT and on_delete=models.CASCADE do on Django models?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am making graphs using bokeh in python and for that I was calling an HTML page to fetch data inside my dataframe but now I want to fetch data directly from database inside my dataframe. So which method is more efficient?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":44,"Q_Id":50506046,"Users Score":0,"Answer":"This depends on a lot of things, namely:\n\nis your database in the same local network as your application server?\nis the website used in the same local network as your application server?\nhow large is the table you have in the website?\nhow large is your database?\ncan a user do some trusted changes on the webpage that is not inside the database yet?\n\nAll in all, the most common case is that your database is in the same local network as your application server, but there is a lot of data stored in there. So, it is difficult to answer in terms of efficiency, it might be quicker to load data from your local network, but selecting items from the database can be very time-consuming, to such an extent that it will be less efficient than loading data from the webpage. So, to compare efficiency, you will have to do a lot of tests and estimations for the future.\nHowever, there are some other aspects\nServer load\nIf you always load from the database, then you have higher server load, which will affect scalability and even performance when longer database tasks are running, for instance some maintenance cron jobs.\nSecurity\nIf a hacker sends some valid requests but with wrong data, you might be misled, so you will need to validate any input from users you do not trust. And you should not trust the users generally, trusted users should be the exception.\nData structure\nYou might cache data for this purpose if you do this with the database and you may use JSON when you send the content of the table to the server, so network communication will not increase.\nNetwork burden\nIf data is sent from the webpage back, then in the case of usage spikes a lot of data might be sent, which might affect the responsiveness of your application.","Q_Score":0,"Tags":"python,database,pandas,api,dataframe","A_Id":50506830,"CreationDate":"2018-05-24T09:42:00.000","Title":"Which is more efficient ? Fetching data directly from databse or from an HTML page in pandas dataframe?","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Hello  im  new  in  programming  with  openerp  ODOO  ,  well  my  issue  is  where  i  can  find  the  functions  of  inserting  into  odoo database  ,  well  i  created  a  new  field  and  i  want  to  insert  the  data  of  this  field  into  the  db","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":513,"Q_Id":50511857,"Users Score":0,"Answer":"If you want to store field value in database then add store=True within your field in python file. Then Your value store into database.","Q_Score":0,"Tags":"python,postgresql,odoo","A_Id":50522026,"CreationDate":"2018-05-24T14:27:00.000","Title":"From where i can insert field input to odoo database","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How to make sure that Process A has completely written large file (5+ GB) in AWS S3 Bucket A before Process B starts copying file to AWS S3 Bucket B using boto3?","AnswerCount":3,"Available Count":2,"Score":0.0665680765,"is_accepted":false,"ViewCount":2604,"Q_Id":50515323,"Users Score":1,"Answer":"You should definitely  use s3 event notification as a trigger to a lambda function that copies your file from Bucket A to Bucket B. The trigger ensures that your copying will start once the file gets uploaded completely. \nMoreover, if you have further operations to perform you can use AWS step functions in which you can define the workflow of your processes , e.g. process B will start after 2 seconds from process A, process C and D will execute in parallel after process B ends it's execution , etc.","Q_Score":1,"Tags":"python,amazon-s3,aws-lambda,boto3","A_Id":50525469,"CreationDate":"2018-05-24T17:47:00.000","Title":"Python Boto3 - how to check if s3 file is completely written before process start copying to another bucket","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How to make sure that Process A has completely written large file (5+ GB) in AWS S3 Bucket A before Process B starts copying file to AWS S3 Bucket B using boto3?","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":2604,"Q_Id":50515323,"Users Score":0,"Answer":"I also do uploads of up to 40GB.  \nSince I do multi-part uploads, I check if the file I am writing to is closed. An S3 file(object) is only closed when all operations are finished.\nAnother way is to use asynchronous task queue like Celery. You will get notifications when a task is done.\nI now use Golang but both those methods have worked very well for me.","Q_Score":1,"Tags":"python,amazon-s3,aws-lambda,boto3","A_Id":52595074,"CreationDate":"2018-05-24T17:47:00.000","Title":"Python Boto3 - how to check if s3 file is completely written before process start copying to another bucket","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a working html build on sphinx v1.1.3 and html pages automatically resize as I change the window size.\nIf I upgraded to sphinx 1.7.4 the page displays with fixed width, with black background on the right. Changing the window size doesn't increase the width beyond a certain max, but shrinking it still shrinks the size of the content and the text wraps. This new behavior is different than v1.1.3 and nothing other than the version of Sphinx was changed.\nI have nothing fancy - looking at html source the only .css files included are classic.css, pygments.css, and html_style.css. Can anyone suggest where to look next to solve the problem?\nThanks.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":1110,"Q_Id":50524871,"Users Score":1,"Answer":"Fixed by adding \"body_max_width\": \"none\" to html_theme_options in conf.py","Q_Score":2,"Tags":"css,python-sphinx,restructuredtext","A_Id":50673139,"CreationDate":"2018-05-25T08:32:00.000","Title":"How do I get sphinx or reStructuredText to fit and resize the width of the content to the width of the window?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Setup\n\nI am running on windows 10\nHave python 3.6 and Java 8\n\ndescription\nI have a Java program which calls and passes an argument to a python program and then receives its output using system commands and cmd. \nQuestion\nHow do I convert it into a single exe file that is the user can run it without installing java(jdk or jre)  and python. \nBoth are a part of my system variable \nThank you","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":3780,"Q_Id":50539030,"Users Score":0,"Answer":"Use pyinstaller to package the python file in a exe.\nThen in the java program replace xyz.py with xyz.exe\nUse JarToExe to convert the jar into a Windows .exe file.\n\nThis way you would have two exe files but the user would not need to install java or python","Q_Score":1,"Tags":"java,python,integration,executable-jar","A_Id":50539385,"CreationDate":"2018-05-26T03:21:00.000","Title":"Converting a jar file to exe file","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have been moving from php to python for my web-development. Have selected django as my prefeered framework. One thing that bugs is the time it takes for my changes of the python code to reload during development. ~10 sec roughly. \nProbably some of my seconds are due to my selected setup of docker-for-mac with mounted volume. But even if it was down to 5sec it would be annoying. I have moved away from the built-in django development server, over to apache 2.4 with mod_wgsi, this improves the speed of the application a lot, but no the python code reloading.\nI know it's like comparing apples and oranges, but coming from php my code changes are available immediately. Does anyone have any tips to speed this up?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1326,"Q_Id":50562698,"Users Score":4,"Answer":"Traced it back to slow disk access with Docker for Mac.","Q_Score":0,"Tags":"python,django,macos,docker,development-environment","A_Id":51999326,"CreationDate":"2018-05-28T09:04:00.000","Title":"How to speed up django development - Code reload","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to crawl some websites and while I am using headless chrome browser with selenium to render some HTLM that have embedded JS, I would also like to simply use requests, for the cases where there is no need for JS code rendering. \nIs there a way to know if the HTML needs to be rendered by a browser or if a simple requests.get() would give me the complete HTML content?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":44,"Q_Id":50568534,"Users Score":0,"Answer":"Any HTML code generated by  tags won't be retrieved by requests. \nThe only way to know if a page would need to be rendered by a browser to generate the whole content is to check if its HTML code has  tags.\nStill, if the information you are interested on is not generated by JS, requests.get() will serve you well.","Q_Score":1,"Tags":"javascript,python,html,selenium,python-requests","A_Id":55472306,"CreationDate":"2018-05-28T14:26:00.000","Title":"How to know HTML page needs to be rendered by JS compiler?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Can a login\/ authentication page for a Google app engine (python)  web application be created, without using the Google identity platform (but possibly a platform common for users having emails on other domains)?\nNote: Other email address domains not other social media applications.","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":346,"Q_Id":50582119,"Users Score":0,"Answer":"Google AppEngine is a generic platform and you can implement any authentication option that supports web. For example Facebook Connect, Linked In, GitHub, etc.\nRefer to a specific authentication platform documentation for implementation details.","Q_Score":1,"Tags":"google-app-engine,google-oauth,openid,google-app-engine-python,google-openid","A_Id":50582453,"CreationDate":"2018-05-29T10:29:00.000","Title":"On Google app engine web applications, what are the authentication options other than Google identity platforms?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have two containers Auth and Frontend. I have managed to get both the containers working independently, I need to establish the link between the two to send and receive HTTP requests.\nGenerally, the connections are made in angular like http:\/\/localhost:3000\/auth\/.\nNote: Both are in different deployments and services.\nShould I be using Ingress or Nginx?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":391,"Q_Id":50582556,"Users Score":0,"Answer":"service will do the job, you just need to replace localhost with service name.","Q_Score":1,"Tags":"python,angular,docker,kubernetes","A_Id":50584666,"CreationDate":"2018-05-29T10:52:00.000","Title":"Kubernetes - Configuring Angular to Work with a Backend API","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have two containers Auth and Frontend. I have managed to get both the containers working independently, I need to establish the link between the two to send and receive HTTP requests.\nGenerally, the connections are made in angular like http:\/\/localhost:3000\/auth\/.\nNote: Both are in different deployments and services.\nShould I be using Ingress or Nginx?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":391,"Q_Id":50582556,"Users Score":0,"Answer":"If your Frontend angular application, needs to connect to the Auth application an the two run on different networks, then just use the IP of your host running the Auth container. If your app requires load balancing, security or you just want to add another level of abstraction and control you may use a proxy like Nginx.","Q_Score":1,"Tags":"python,angular,docker,kubernetes","A_Id":50586256,"CreationDate":"2018-05-29T10:52:00.000","Title":"Kubernetes - Configuring Angular to Work with a Backend API","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a django oscar shop that I'm attempting to upgrade to Oscar 1.6.  My shop extends Oscar's promotions model (although at this stage, does little with it).\nIt works fine if I remove the promotions app from the project, and it works fine in django 1.5.  However when I try to start the app in Oscar 1.6, I get the following error.\nLookupError: App 'promotions' doesn't have a 'KeywordPromotion' model.\nIt seems that none of Oscar's promotions models are being loaded at startup.  There's a message in the release notes that says:\n\nThe majority of the Oscar class imports now use dynamic loading,\n  instead of direct imports, for better extensibility and\n  customisability.\n\nDoes anyone know if this, or otherwise is preventing the promotions model from loading?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":538,"Q_Id":50584891,"Users Score":1,"Answer":"In my case I didn't have a models.py in my overridden promotions app...  It just needs to contain this:\n\nfrom oscar.apps.promotions.models import *","Q_Score":0,"Tags":"python,django,django-oscar","A_Id":50585558,"CreationDate":"2018-05-29T12:50:00.000","Title":"LookupError: App 'promotions' doesn't have a 'KeywordPromotion' model when upgrading to django oscar 1.6","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I work with python and data mine some content which I categorize into different categories. \nThen I go to a specific webpage and submit manually the results. \nIs there a way to automate the process? I guess this is a \"form-submit\" thread but I haven't seen any relevant module in Python. Can you suggest me something?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":64,"Q_Id":50589351,"Users Score":0,"Answer":"If you want make this automatic yo have to see which params are send in the form and make a request with this params to the endpoint but directly from your python app, or search a package that simulate a browser and fill the form, but I think that the correct way is making the request directly from your app","Q_Score":0,"Tags":"python,form-submit","A_Id":50589450,"CreationDate":"2018-05-29T16:52:00.000","Title":"How to fill textareas and select option (select tag) and hit submit (input tag) via python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I work with python and data mine some content which I categorize into different categories. \nThen I go to a specific webpage and submit manually the results. \nIs there a way to automate the process? I guess this is a \"form-submit\" thread but I haven't seen any relevant module in Python. Can you suggest me something?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":64,"Q_Id":50589351,"Users Score":0,"Answer":"Selenium Webdriver is the most popular way to drive web pages, but Python also has beautifulsoup;  Either library will work.","Q_Score":0,"Tags":"python,form-submit","A_Id":50589446,"CreationDate":"2018-05-29T16:52:00.000","Title":"How to fill textareas and select option (select tag) and hit submit (input tag) via python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have django 1.11 with latest django-storages, setup with S3 backend.\nI am trying to programatically instantiate an ImageFile, using the AWS image link as a starting point. I cannot figure out how to do this looking at the source \/ documentation. \nI assume I need to create a file, and give it the path derived from the url without the domain, but I can't find exactly how.\nThe final aim of this is to programatically create wagtail Image objects, that point to S3 images (So pass the new ImageFile to the Imagefield of the image). I own the S3 bucket the images are stored in it.\nUploading images works correctly, so the system is setup correctly.\nUpdate\nTo clarify, I need to do the reverse of the normal process. Normally a physical image is given to the system, which then creates a ImageFile, the file is then uploaded to S3, and a URL is assigned to the File.url. I have the File.url and need an ImageFile object.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2104,"Q_Id":50609686,"Users Score":6,"Answer":"It turns out, in several models that expect files, when using DjangoStorages, all I had to do is instead of passing a File on the file field, pass the AWS S3 object key (so not a URL, just the object key).\nWhen model.save() is called, a boto call is made to S3 to verify an object with the provided key is there, and the item is saved.","Q_Score":4,"Tags":"django,boto3,wagtail,python-django-storages","A_Id":50804853,"CreationDate":"2018-05-30T16:38:00.000","Title":"Django storages S3 - Store existing file","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a bunch of python classes that are responsible for validating files like so:\n\njava file validator\nhtml file validator\ncss file validator\njavascript file validator\n\nAll of these classes define a validate_file(path) and validate_string(string) function.\nIn the client code of my application, I store all of these validators in an array and I iterate through all of them and call the methods on them in exactly the same way.\nIs there a purpose in my case of defining a base \"validator\" class which defines these methods as abstract? How can I benefit from making these individual classes adhere to the base class? Or maybe in other words, what features would be unlocked if I had a base class with all of these validators implementing it?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":41,"Q_Id":50622529,"Users Score":3,"Answer":"If you ever write code that needs to process mixed types, some of which might define the API method, but which shouldn't be considered \"validators\", having a common base class for \"true\" validators might be helpful for checking types ahead of time and only processing the \"true\" validators, not just \"things that look like validators\". That said, the more complex the method name, the less likely you are to end up with this sort of confusion; the odds of a different type implementing a really niche method name by coincidence are pretty small.\nThat said, that's a really niche use case. Often, as you can see, Python's duck-typing behavior is good enough on its own; if there is no common functionality between the different types, the only meaningful advantages to having the abstract base class are for the developer, not the program itself:\n\nHaving a common point of reference for the API consumer makes it clear what methods they can expect to have access too\nFor actual ABCs with @abstractmethod decorated methods, it provides a definition-time check for subclasses, making it impossible for maintainers to omit a method by accident","Q_Score":1,"Tags":"python,oop","A_Id":50622721,"CreationDate":"2018-05-31T10:48:00.000","Title":"What is the purpose of base classes in Python if you're already referring to the implementation classes consistently","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a bunch of python classes that are responsible for validating files like so:\n\njava file validator\nhtml file validator\ncss file validator\njavascript file validator\n\nAll of these classes define a validate_file(path) and validate_string(string) function.\nIn the client code of my application, I store all of these validators in an array and I iterate through all of them and call the methods on them in exactly the same way.\nIs there a purpose in my case of defining a base \"validator\" class which defines these methods as abstract? How can I benefit from making these individual classes adhere to the base class? Or maybe in other words, what features would be unlocked if I had a base class with all of these validators implementing it?","AnswerCount":2,"Available Count":2,"Score":0.1973753202,"is_accepted":false,"ViewCount":41,"Q_Id":50622529,"Users Score":2,"Answer":"Base classes in Python serve to share implementation details and document likenesses. We don't need to use a common base class for things that function similarly though, as we use protocols and duck typing. For these validation functions, we might not have a use for a class at all; Java is designed to force people to put everything inside classes, but if all you have in your class is one static method, the class is just noise. Having a common superclass would enable you to check dynamically for that using isinstance, but then I'd really wonder why you're handling them in a context where you don't know what they are. For a programmer, the common word in the function name is probably enough.","Q_Score":1,"Tags":"python,oop","A_Id":50622740,"CreationDate":"2018-05-31T10:48:00.000","Title":"What is the purpose of base classes in Python if you're already referring to the implementation classes consistently","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've created a fully functioning blog application in django . But i want to create multiple blogs like i can create multiple posts on blog. How to approach this problem?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":132,"Q_Id":50627239,"Users Score":0,"Answer":"You can just have a one a app per django project beacuse we should import view.py and models.py and urls.py and ... in your some files !","Q_Score":0,"Tags":"python,django","A_Id":50627738,"CreationDate":"2018-05-31T14:56:00.000","Title":"Can i create the same app multiple times in django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've created a fully functioning blog application in django . But i want to create multiple blogs like i can create multiple posts on blog. How to approach this problem?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":132,"Q_Id":50627239,"Users Score":2,"Answer":"No, you cannot have multiple Django apps of the same name. But, much like you\u2019d have a Post model for a singular blog you can create a Blog table and have each Post have a foreign key to the Blog that post belongs to.","Q_Score":0,"Tags":"python,django","A_Id":50627440,"CreationDate":"2018-05-31T14:56:00.000","Title":"Can i create the same app multiple times in django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So for example: if I'm working in an arbitrary application and or model but I want to get a handle to the application and \/ or model that will be actually handling the current URL in the browser address bar.\nUPDATE: my question was perhaps not clear enough. I need the reference to the application inside a model, not a view.","AnswerCount":3,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":36,"Q_Id":50628321,"Users Score":0,"Answer":"self.request.resolver_match.namespace","Q_Score":0,"Tags":"python,django","A_Id":50661547,"CreationDate":"2018-05-31T15:54:00.000","Title":"How to tell which application or model will be processing a given URL?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Django channels 2.1.1\nSo, this is my logic, one Websocket instance is getting messages of the same type \"alarm.data\" from 2 differents groups. One group \"alarms\" and another groupr \"alarms_specific_for_user_IDUSER\"\nCould I know where they come from whitout adding a \"tag\" in the text message?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":158,"Q_Id":50642592,"Users Score":3,"Answer":"No you will need to put it into the message from the self.scope['user'] property from the Channel that created the message.","Q_Score":1,"Tags":"django,python-3.x,django-channels","A_Id":50652595,"CreationDate":"2018-06-01T11:37:00.000","Title":"Django Channels: Could I know who is the sender of a message?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I wanted to run official Django tutorial. I've installed Django using pip, and started the project. And when I run python manage.py runserver the console shows the same thing as in tutorial, but when I open the page http:\/\/127.0.0.1:8000\/ or localhost:8000 I only see 404 not found.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":323,"Q_Id":50645707,"Users Score":1,"Answer":"You are getting the 404 error because in your urls.py you have not added url for \/.\nTry in your browser: localhost:8000\/admin and it should work.","Q_Score":0,"Tags":"python,django","A_Id":50645856,"CreationDate":"2018-06-01T14:29:00.000","Title":"Can't run Django project","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I started learning django a few days back and started a project, by luck the project made is good and I'm thinking to deploy it. However I didn't initiate it in virtual environment. have made a virtual environment now and want to move project to that. I want to know how can I do that ? I have created requirements.txt whoever it has included all the irrelevant library names. How can I get rid of them and have only that are required for the project.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":863,"Q_Id":50654965,"Users Score":1,"Answer":"Django is completely unrelated to the environment you run it on.  \nThe environment represents which python version are you using (2,3...) and the libraries installed.\nTo answer your question, the only thing you need to do is run your manage.py commands from the python executable in the new virtual environment. Of course install all of the necessary libraries in the new environment if you haven't already did so.\nIt might be a problem if you created a python3 environment while the one you created was in python2, but at that point it's a code portability issue.","Q_Score":1,"Tags":"python,django,virtualenv","A_Id":50655762,"CreationDate":"2018-06-02T08:27:00.000","Title":"How should I move my completed Django Project in a Virtual Environment?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to create a web application using flask. I have already gotten somewhat comfortable with using python, and have done so using spyder, inside of Anacanda Navigator. Now I am playing around with flask doing basic functions and have successful so far by testing it out in local server 127.0.0.1:5000. The problem I am having is that I cannot stop the server once I run the script in spyder. I have stopped the script and run other scripts through the console, but the local server remains the same. \nThe reason this is a problem for me is because when I try to change files and run a different flask script, the server does not update with the new information. For example, if I run a flask script that returns \"Hello World\" on the main page, and then I stop that file, open a new file that has a different flask script that returns \"The sky is blue\" the server does not change when I check it on chrome or any other browser. It will onyl return \"Hello World\"\nI have been able to fix this problem by completely restarting my computer, but I am wondering if there is another way, just to restart the local server, 127.0.0.1:5000. Thank You!\nAlso I am using windows","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1455,"Q_Id":50659044,"Users Score":0,"Answer":"I do : \"Run > Configuration per file > Execute in an external system terminal\",\nthen when you run your .py containing the app.run, it will be launched in an external console. If you close the console the server will be closed too.","Q_Score":1,"Tags":"python,flask,localserver","A_Id":70109368,"CreationDate":"2018-06-02T16:41:00.000","Title":"using flask in spyder stuck in local server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to create a web application using flask. I have already gotten somewhat comfortable with using python, and have done so using spyder, inside of Anacanda Navigator. Now I am playing around with flask doing basic functions and have successful so far by testing it out in local server 127.0.0.1:5000. The problem I am having is that I cannot stop the server once I run the script in spyder. I have stopped the script and run other scripts through the console, but the local server remains the same. \nThe reason this is a problem for me is because when I try to change files and run a different flask script, the server does not update with the new information. For example, if I run a flask script that returns \"Hello World\" on the main page, and then I stop that file, open a new file that has a different flask script that returns \"The sky is blue\" the server does not change when I check it on chrome or any other browser. It will onyl return \"Hello World\"\nI have been able to fix this problem by completely restarting my computer, but I am wondering if there is another way, just to restart the local server, 127.0.0.1:5000. Thank You!\nAlso I am using windows","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1455,"Q_Id":50659044,"Users Score":0,"Answer":"To Kill the local server, you may use Ctrl+C command and not any other command. This command is also mentioned when the server is up and running.","Q_Score":1,"Tags":"python,flask,localserver","A_Id":52691604,"CreationDate":"2018-06-02T16:41:00.000","Title":"using flask in spyder stuck in local server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it possible to output formatted raw HTML code in Jupyter as with prettify from BeautifulSoup?\nWhen I call prettify in Jupyter, it gives me the same messy output as with simply calling .content on the result I get from requests.get.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":986,"Q_Id":50665045,"Users Score":0,"Answer":"Have you tried to use a print?\nJupyter (like ipython) calls the __repr__ method for the result of the operation.\nIn this case, it's the __repr__ of a string, which adds the simple quotes and escapes the special characters (\\n, \\t...) so they are not interpreted.\nBut those characters are interpreted with print","Q_Score":0,"Tags":"python,html,web-scraping,beautifulsoup,jupyter","A_Id":50665835,"CreationDate":"2018-06-03T09:41:00.000","Title":"How to show formatted\/indented HTML code in Jupyter notebook","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on a Django application which uses django-leaflet, but this question applies to any python library. I want to change some django-leaflet code to see if the changes would solve a problem we are having. What are my options? Do I need to create an example app in the django-leaflet repository and preform my modify-test loop there? Or do I need to upload individual re-named versions of django-leaflet to pypi?","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":430,"Q_Id":50668530,"Users Score":2,"Answer":"You can modify your 3rd party app by uninstalling it using pip uninstall, then copying (or git cloning) the app into your source tree. You may need to temporarily add a line like sys.path.append(\".\/django-leaflet\") to your manage.py file so that the 3rd party modules will be in scope.\nOnce you are happy with your changes, you can send them to the original author as a pull request or upload your own version of the app.","Q_Score":3,"Tags":"python,django,pypi","A_Id":50668531,"CreationDate":"2018-06-03T16:26:00.000","Title":"How do I effectively make changes to a 3rd party django app?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have Django with Django Cachalot and I need know what is cached with cachalot in my server? I want to use CACHALOT_UNCACHABLE_TABLES parameter and I need to know if this works and certain tables are not cached. I hope that somebody can help me, thank you.\nI initialized the parameter like this: CACHALOT_UNCACHABLE_TABLES = frozenset(('django_migrations', 'company_company', 'customers_customer, 'auth_user'))","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":383,"Q_Id":50678758,"Users Score":-2,"Answer":"Correctly, I checked this. If you use CACHALOT_UNCACHABLE_TABLES setting this variable with the table names that tables doesn't cache with Cachalot.","Q_Score":1,"Tags":"python,django,caching","A_Id":50975064,"CreationDate":"2018-06-04T10:43:00.000","Title":"How can I know what is cached with django cachalot on my server?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I managed to succefully install django-allauth and configure my app to allow authentication via Google Oauth2, but when i try to configure GitLab Oauth2 integration it juste fail with the message:\n\nThe redirect URI included is not valid.\n\nI did set \nhttp:\/\/xxx.xxx.xx\/accounts\/gitlab\/login\/callback\/ as Callback url \nThanks!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1718,"Q_Id":50696207,"Users Score":0,"Answer":"You need to whitelist the redirect URLs of your app in GitLab.\nAdmin Area -> Applications -> Your Django App -> Callback URL","Q_Score":1,"Tags":"python,django,django-allauth","A_Id":52316520,"CreationDate":"2018-06-05T09:03:00.000","Title":"Using self-hosted GitLab as Oauth Provider","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am trying to deploy WSGi based app that's built using Python, Flask on AWS Lambda. \nBut, it seems that the round trip of the request is going but when the request is being returned the werkzeug module is not able to call LambdaContext: Not a callable object. \n'LambdaContext' object is not callable: TypeError\nTraceback (most recent call last):\nFile \"\/home\/ubuntu\/venv\/local\/lib\/python2.7\/site-packages\/flask\/app.py\", line 1997, in call\nFile \"\/home\/ubuntu\/venv\/local\/lib\/python2.7\/site-packages\/flask\/app.py\", line 1989, in wsgi_app\nFile \"\/tmp\/pip-install-Xytrxp\/Werkzeug\/werkzeug\/wrappers.py\", line 1277, in call\nTypeError: 'LambdaContext' object is not callable\nI am trying to use serverless to deploy but my problem is that when i build a deployment package using serverless it's going to go beyond 250 MB which is the limit of AWS Lambda\nI have built the package using Zappa by removing some of the unnecessary files in python packages and the size of that is 248 MB. I am able to use that to deploy but using serverless deploy is throwing issues. \nSo, is any one aware of what actually serverless does? Can we include serve.py and wsgi.py files in the AWS Lambda deployment package? \nIf yes, what are more changes needed to be able to just add these python files to deployment package to make the application wrapped on serverless.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":833,"Q_Id":50711086,"Users Score":0,"Answer":"I was able to handle this by using serverless-wsgi. We just need to include wsgi.py and .wsgi_app files and need to put wsgi.handler as the Lambda Function Handler","Q_Score":1,"Tags":"python,amazon-web-services,aws-lambda,serverless","A_Id":50750689,"CreationDate":"2018-06-06T01:34:00.000","Title":"Deploying WSGi app on AWS Lambda","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've got django running with models.\nNow, I want that fill todatabase with information from different websites.\nThere comes scraping, I know. What I'm missing is knowledge if there's any tool to scrape pages with Django that gives compatibility with existing database\/models?\nPlease note that I'd like to run this scraping task every 5 mins for example, so it won't be one-run script.\nCould you please point me out which tools should I use? Should I stay with Django or use something external?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":147,"Q_Id":50721473,"Users Score":2,"Answer":"You can use Celery in your Django project, with Celery you will create tasks to scrape the websites you want and use it inside your Models.\nThe hardest part should be the scrape it self, insert the data inside your models is easy.","Q_Score":1,"Tags":"python,django,web-scraping","A_Id":50722916,"CreationDate":"2018-06-06T13:16:00.000","Title":"Django&Python, scrape page to fill up database","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Any library in Robot Framework has two categories of keywords. The keywords to carry out a regular test step (e.g. Click Button) and the keywords that verify certain thing (e.g. Table Column Should Contain). The latter keywords typically have the word \"Should\" in them.\nI assume that Robot Framework only puts PASS or FAIL status for the executed test cases in the report. How can I distinguish the FAIL test cases failed due to test step keywords versus failed due to test verification keywords?\nFor example, the calculator test case clicks 2, +, 2, = buttons and then verifies answer 4 as part of the last keyword (e.g. Should Be Equal As Numbers). If it fails while failing to click any button then I will consider it as \"Failed to carry out its actual verification\" (my result processing script will not log a bug here). However, if it fails while actually verifying the result then it is a valid bug associated with the test case (my result processing script can take action accordingly, like logging a bug).\nIf there are no techniques for generating the result file as per my requirement (PASS, FAIL and maybe FAIL_TO_VERIFY statuses), then I am seeking a technique to process the result or log xml to identify the kind of failure (FAIL vs FAIL_TO_VERIFY) for every FAIL test case.\nPS: I have already figured out the bug logging part in my result processing script. So consider it as out of scope for the above question.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":3153,"Q_Id":50732910,"Users Score":0,"Answer":"Can you please check this keyword Register Keyword To Run On Failure in selenium2library  , this keyword will allow to execute any other keyword when your slenium2library keywords fail. so you can call your bug reporting keyword here","Q_Score":1,"Tags":"python,robotframework","A_Id":50733615,"CreationDate":"2018-06-07T04:21:00.000","Title":"Robot Framework: How to distinguish the test case FAIL due to regular test step keyword failure versus verification test step failure","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am getting the following error while deploying the google app engine\nERROR: gcloud crashed (SSLHandshakeError): [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:661)\nIf you would like to report this issue, please run the following command:\n  gcloud feedback\nTo check gcloud for common problems, please run the following command:\n  gcloud info --run-diagnostics\nI am using python 2.7 also tried turning off firewall settings but doesnot help. Any suggestions?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":894,"Q_Id":50747034,"Users Score":1,"Answer":"This is a common network issue seen when there is a networking proxy present on your network or antivirus and similar software that might prevent the connection. \nAs you mentioned the issue was solved when deactivating an antivirus software. If you still want to run the antivirus, you can configure it properly to allow the connection to GCP.","Q_Score":1,"Tags":"google-app-engine,google-cloud-platform,ssl-certificate,google-app-engine-python","A_Id":50756281,"CreationDate":"2018-06-07T17:27:00.000","Title":"ssl handshake error while deploying google app engine","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Everytime I try to run a django app in terminal using a python manage.py runserver command I get the following error:\nReferenced from: \/Users\/myname\/anaconda\/lib\/python2.7\/site-packages\/_mysql.so\n  Reason: image not found.\nDid you install mysqlclient or MySQL-python?\n\nTo fix it, I just paste\nexport DYLD_LIBRARY_PATH=\/usr\/local\/mysql\/lib\/\n\ninto my terminal. How can I rearrange my files so that I don't have to paste this in every time? I am working on a Mac.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":254,"Q_Id":50751008,"Users Score":2,"Answer":"Assuming you're just using the default terminal, you could put the command in your .bash_profile\/.bashrc by running something like\necho \"export DYLD_LIBRARY_PATH=\/usr\/local\/mysql\/lib\/\" >> ~\/.bash_profile\nSwitching .bash_profile with your equivalent.Then when you start a new terminal it should already be applied. To apply it immediately just run\nsource ~\/.bash_profile","Q_Score":0,"Tags":"python,mysql,django,macos","A_Id":50751138,"CreationDate":"2018-06-07T22:31:00.000","Title":"MySQL and Python - \"image not found\" -- permanent fix?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Is there any solid refernce as to how multiple parameters can fit within response.meta.get(\"something\",\"someotherthing\")in scrapy? If it is posible then how someotherthing relates to something?\nI searched a lot but could not find anywhere the exact answer I'm after.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":120,"Q_Id":50775373,"Users Score":1,"Answer":"response.meta in scrapy it's just a normal python dict, and as a python dict it has the method get which is None safe - when the second parameter is a default value that take place in case the first parameter is not in the dict.\nfor example:\nwhile response.meta['unknown_key'] will raise KeyError exception,\nresponse.meta.get('unknown_key') will return None, and \nresponse.meta.get('unknown_key', 'abc') will return abc","Q_Score":1,"Tags":"python,python-3.x,web-scraping,scrapy,scrapy-spider","A_Id":50777116,"CreationDate":"2018-06-09T14:36:00.000","Title":"Multiple parameters within response.meta.get()","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have django oscar application which use PayU as a payment provider. I'm writing tests, to test my refund mechanism. So I am using sandbox service for do such things. I have created test, which place request to PayU \"create order\". Then I got a redirect url, where I can (in browser) do fake payment using my bank account. But in test, I would like to do it programatically. I read whole documentation, but I didn't find such option. On SoF there is no similar questions. PayU support didn't aswer my question(they have 24h).\nI'm wondering if there is possibility to post proper form to proper url on payu - but after quick html review I think it may be tricky.\nDo you have any ideas how to solve this problem?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":248,"Q_Id":50797314,"Users Score":0,"Answer":"After reading documentation I have found sollution.\nFirst of all, I should not use \"pay with bank account\". \nI should use \"pay with credit\/debit card\".\nAnd in payu documentation there is information which data use to complete payment programatically (by sending POST data).","Q_Score":0,"Tags":"python,testing,payu","A_Id":50797446,"CreationDate":"2018-06-11T12:04:00.000","Title":"How can I programatically do fake payment in payu sandbox?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Facebook's faiss index with custom indexes using the add_with_ids method. In inference time I use distance, ID = model.search() which returns the custom ID it was trained with. Is it possible to return also a unique id without retraining? Or just return the actual closest vector?\nThank you!","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":1900,"Q_Id":50798515,"Users Score":2,"Answer":"Since you provided the actual vectors, you presumably know how to map ids to vectors. \nMost Faiss indexes in do not store the vectors, because they need to be compressed to fit in RAM.","Q_Score":1,"Tags":"python,knn","A_Id":51878585,"CreationDate":"2018-06-11T13:08:00.000","Title":"How to return 'faiss' unique vector id on 'add_with_ids' trained index?","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I created an application where users can add posts. I would like to add the post status. Post after adding has the status \"active.\" After 30 days, changes the status to \"inactive\" How can I do it?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":40,"Q_Id":50802188,"Users Score":0,"Answer":"I think you don't have any idea to solve this issue so here is two:\n\nwrite a background worker (like celery) run it every few hours and mark old posts as inactive\nadd a created_at field to your db and instead of marking post as inactive rememvber if created_at is older than 30 days you can't edit\/update that post.\n\nI personally prefer second solution because that doesn't need a bacground worker","Q_Score":0,"Tags":"python,django","A_Id":50802265,"CreationDate":"2018-06-11T16:23:00.000","Title":"Status post. Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We've recently moved from App Service to App Service Environment on Azure. We need Python 3.6 to run the web API. But we're not able to install the extensions. Are extensions disabled on App service environment. Azure by default offers Python 3.4.1. But few of the libraries need a minimum of 3.6.4 which is available as a extensions. Is there a workaround for this or are we limited to the default Python 3.4.1 available with Azure ?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":984,"Q_Id":50816456,"Users Score":0,"Answer":"This is indeed possible but took a bit of experimenting. I had to open the Kudu console from a VM which is inside the same VNet as the App Service Environment. From there on, it's a cake walk. You can also configure Web Jobs from the VM which is otherwise not possible from the portal.","Q_Score":0,"Tags":"python,azure,azure-app-service-envrmnt","A_Id":51572844,"CreationDate":"2018-06-12T11:49:00.000","Title":"Extensions not supported on Azure App Service Environment","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm using Odoo 10 mass mailing module to send newsletters. I have configured it but I don't know how to configure bounced emails. It is registering correctly sent emails, received (except that it is registering bounced as received), opened and clicks.\nCan anyone please help me?\nRegards","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":520,"Q_Id":50819764,"Users Score":0,"Answer":"I managed to solve this problem. Just configured the 'bounce' system parameter to an email with the same name.\nExample:\nI created an email bounce-register@example.com. Also remember to configure the alias domain in your general settings to 'example.com'\nAfter configuring your email to register bounces you need to configure an incomming mail server for this email (I configured it as an IMAP so I think that should do altough you can also configure it as a POP). That would be it.\nHope this info server for you","Q_Score":0,"Tags":"python,email,odoo,odoo-10","A_Id":50861301,"CreationDate":"2018-06-12T14:34:00.000","Title":"Odoo 10 mass mailing configure bounces","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to start a python script via java and send the data via socket back to the java program.\nMy problem is that when I start the python script after the SocketServer is created with Runtime.getRuntime().exec(\"python3 ~\/Documents\/sensor\/sensorADC.py\");\nno connection is established and no data is transmitted.\nBut when I start the script manually via CLI, everything works fine.\nThe timing of the program start shouldn't be the problem, because I already tried different ways and orders.\nThe java program is a javaFx application.\nEDIT: tested in Linux\n2nd Edit:\n    private void startPythonScript () {\n        try {\n            measureProcess = Runtime.getRuntime().exec(\"python3 ~\/Documents\/sensor\/sensorADC.py\")); \n        } catch (IOException e) {\n                e.printStackTrace();\n        }\n    }\nWhat am I missing?\nThank you in advance","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":98,"Q_Id":50821130,"Users Score":0,"Answer":"I \"solved\" it.\nI compiled it with pyinstaller and now it works. Python seems to be the problem here.\nBut I don't know why....\nFor others I compiled it to an executable with pyinstaller --onefile sensor.py","Q_Score":3,"Tags":"java,python","A_Id":50843052,"CreationDate":"2018-06-12T15:46:00.000","Title":"Java start python process","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have an MVN project and would like to add a Python program in the project. The IDE I am using in Intellij.\n\nI have added the MVN pom file as below:\n\norg.codehaus.mojo\nversions-maven-plugin\n2.1\n\n\n\npython\nsrc\/main\/resources\/pythonlib \n\nPYTHONPATH\n\n\n\n\nAdded the Python plugin\nWhile trying to run from the editor it is asking for Python interpreter:\n\nWhich has 2 radio buttons:\n\nUse SDK of the module\nUse specified interpreter.\n\nIn both the list does not have any Python interpreter. How to have the list display a Python interpreter.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":86,"Q_Id":50835836,"Users Score":0,"Answer":"Added the interpreter at module level in project settings an it worked fine for me. \nProject Settings -> Modules -> Click + an added the python home directory.","Q_Score":1,"Tags":"python,maven,intellij-idea","A_Id":50839568,"CreationDate":"2018-06-13T11:15:00.000","Title":"Intellij - Python interpretor","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I try to manage if condition in Django.\nIt's working fine but getting an error when trying to check with flake8\nflake8 data\/view.py\nMy condition like this:\nif user.item.purchase.status == True:\nHere user, item and purchase is model and status is a field of purchase. \nand Status have Three values 1)Undefine 2)True 3)False\n\nI'm doing something wrong?\n\nFlake8 error E712 comparison to True should be 'if cond is True:' or 'if cond:'\nThanks in advance","AnswerCount":3,"Available Count":1,"Score":-0.1973753202,"is_accepted":false,"ViewCount":4124,"Q_Id":50836584,"Users Score":-3,"Answer":"use \"is\" instead of \"==\"","Q_Score":3,"Tags":"python,django,python-3.x,if-statement,django-rest-framework","A_Id":65944875,"CreationDate":"2018-06-13T11:52:00.000","Title":"Flake8 error `E712 comparison to True should be 'if cond is True:' or 'if cond:'` in django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to automate my mobile web app.Every time it loads, it will ask \"___ would like to use your location\". User can either hit \"don't allow\" or \"OK.\"\nI am using self.driver.switch_to.alert.accept(), but it is accepting the default, which is \"don't allow.\" How can I accept the \"OK\" instead of \"don't allow\"?","AnswerCount":4,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1548,"Q_Id":50842653,"Users Score":0,"Answer":"I understood that you are asking for the device location alert. You can identify and use the Xpath of OK button to click. I have used the following code (in java) for an alert appears in the app.\ndriver.findElement(By.xpath(\"\/\/UIAApplication[1]\/UIAWindow[7]\/UIAAlert[1]\/UIACollectionView[1]\/UIACollectionCell[1]\/UIAButton[1]\")).click();","Q_Score":1,"Tags":"python,ios,mobile,automation,appium","A_Id":51200905,"CreationDate":"2018-06-13T17:03:00.000","Title":"How to press \"OK\" for location popup on iOS Appium","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"As far as I have read it seems like Jinja is only for creating HTML files. Can it be used for creating python files as well?","AnswerCount":2,"Available Count":1,"Score":-0.2913126125,"is_accepted":false,"ViewCount":1778,"Q_Id":50850819,"Users Score":-3,"Answer":"Jinja is mainly to embed python code into html templates, similar to PHP's <?php echo \"Hello\" ?> if you're familiar with PHP.","Q_Score":3,"Tags":"python,jinja2","A_Id":50850931,"CreationDate":"2018-06-14T06:19:00.000","Title":"Is It possible to create Python files using Jinja","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"So I recently downloaded python3 and django-2 but I realised my computer has already python 2 and django 1.11, so I managed to create project with django 3 using python3 django -m startproject or something like this, even I managed to create a django 2 project, this time at the urls.py, it says \"No name 'path' in module 'django.urls'.\nCan you help me with how to create a project using django2 and python3 in lubuntu and this error.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":150,"Q_Id":50867343,"Users Score":0,"Answer":"first install the django by sudo python3 -m pip install django after that check for the version by python3 -m django --version it will surely be the latest version of the django and then start your project by django-admin startproject mysite where mysite is the name of project you want to start. This problem may be arised due to an old version of django, so you have to use the latest version of django.\nHope it will help you.","Q_Score":0,"Tags":"python,django,path,pip","A_Id":50867576,"CreationDate":"2018-06-14T23:40:00.000","Title":"No name 'path' issue, unable to start project in django, lubuntu","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to create a dataset to do sentiment analysis on news articles. I'm using Newspaper3k to scrape articles from the website. I scraped a few websites but didn't store the articles properly and hence I can't use them. When I try scraping the same websites again it only scrapes the new articles and not the ones it already scraped. Is there a way for me to scrape the articles I already scraped again??","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":367,"Q_Id":50868855,"Users Score":1,"Answer":"By default, newspaper caches all previously extracted articles and eliminates any article which it has already extracted.\nThis feature exists to prevent duplicate articles and to increase extraction speed.\nYou may opt out of this feature with the memoize_articles parameter.\nFor example, in your case set it to False:\nnewspaper.build('http:\/\/cbs.com', memoize_articles=False)","Q_Score":2,"Tags":"python,nlp,sentiment-analysis,python-newspaper","A_Id":50977391,"CreationDate":"2018-06-15T03:49:00.000","Title":"How to reread the news on website using newspaper3k","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to use tesseract-ocr on AWS EC2 machine using python.\nI have install tesseract-ocr, pytesseract and set TESSDATA_PREFIX=\/usr\/local\/share\/tessdata... but still geting below error while calling image_to_string method of pytesseract.\n\npytesseract.pytesseract.TesseractNotFoundError: tesseract not\n  installed or it's not in your path","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":885,"Q_Id":50874626,"Users Score":0,"Answer":"you have to add tesseract installation folder to path too. if you have done that already, you might need to restart once or at least sign out and sign in. TESSDATA is the path you give for tesseract to access the language data.","Q_Score":0,"Tags":"python,amazon-web-services,amazon-ec2,ocr,python-tesseract","A_Id":50874671,"CreationDate":"2018-06-15T11:23:00.000","Title":"AWS EC2 machine giving \"pytesseract.pytesseract.TesseractNotFoundError: tesseract not installed or it's not in your path\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How can I delete a Django model without effecting the table it works with.\nPreviously we've used the model and table normally but have since moved the models functionality to a microservice which still operates on the same table.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":102,"Q_Id":50881441,"Users Score":0,"Answer":"You can rename your sql table and then delete the model and then rename back.","Q_Score":0,"Tags":"python,mysql,django,database,models","A_Id":50881461,"CreationDate":"2018-06-15T19:09:00.000","Title":"How to delete a Django model without deleting the table","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using bs4 and urllib.request in python 3.6 to webscrape. I have to open tabs \/ be able to toggle an \"aria-expanded\" in button tabs in order to access the div tabs I need.\nThe button tab when the tab is closed is as follows with <> instead of --:\nbutton id=\"0-accordion-tab-0\" type=\"button\" class=\"accordion-panel-title u-padding-ver-s u-text-left text-l js-accordion-panel-title\" aria-controls=\"0-accordion-panel-0\" aria-expanded=\"false\"\nWhen opened, the aria-expanded=\"true\" and the div tab appears underneath.\nAny idea on how to do this?\nHelp would be super appreciated.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1681,"Q_Id":50882732,"Users Score":0,"Answer":"BeautifulSoup is used to parse HTML\/XML content. You can't click around on a webpage with it. \nI recommend you look through the document to make sure it isn't just moving the content from one place to the other. If the content is loaded through AJAX when the button is clicked then you will have to use something like selenium to trigger the click.\nAn easier option could be to check what url the content is fetched from when you click the button and make a similar call in your script if possible.","Q_Score":0,"Tags":"python-3.x,dom,web-scraping,beautifulsoup,urlopen","A_Id":50882877,"CreationDate":"2018-06-15T21:13:00.000","Title":"Accessing Hidden Tabs, Web Scraping With Python 3.6","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"For the app I'm building I need to be able to create a new data model in models.py as fast as possible automatically. \nI created a way to do this by making a seperate python program that opens models.py, edits it, closes it, and does server migrations automatically but there must be a better way.\nedit: my method works on my local server but not on pythonanywhere","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":80,"Q_Id":50886139,"Users Score":1,"Answer":"In the Django documentation, I found SchemaEditor, which is exactly what you want. Using the SchemaEditor, you can create Models, delete Models, add fields, delete fields etc..\nHere's an excerpt:\n\nDjango\u2019s migration system is split into two parts; the logic for\n  calculating and storing what operations should be run\n  (django.db.migrations), and the database abstraction layer that turns\n  things like \u201ccreate a model\u201d or \u201cdelete a field\u201d into SQL - which is\n  the job of the SchemaEditor.","Q_Score":0,"Tags":"django,python-3.x,django-models","A_Id":50940394,"CreationDate":"2018-06-16T08:08:00.000","Title":"How can I add new models and do migrations without restarting the server manually?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"When I run this simple code:\nfrom flask import Flask,render_template\napp = Flask(__name__)\n@app.route('\/')\ndef index():\n    return 'this is the homepage'\nif __name__ ==  \"__main__\":\n    app.run(debug=True, host=\"0.0.0.0\",port=8080)\nIt works fine but when I close it using ctrl+z in the terminal and try to run it again I get OSError: [Errno 98] Address already in use\nSo I tried changing the port address and re-running it which works for some of the port numbers I enter. But I want to know a graceful way to clear the address being used by previous program so that it is free for the current one. \nAlso is what is the apt way to shutdown a server and free the port address.\nKindly tell a simple way to do so OR explain the method used fully because I read solutions to similar problems but didn't understand any of it.\nWhen I run\nnetstat -tulpn\nThe output is : \n(Not all processes could be identified, non-owned process info\n will not be shown, you would have to be root to see it all.)\nActive Internet connections (only servers)\nProto Recv-Q Send-Q Local Address           Foreign Address         State       PID\/Program name\ntcp        0      0 127.0.1.1:53            0.0.0.0:*               LISTEN      -\ntcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN      -\ntcp        0      0 0.0.0.0:3689            0.0.0.0:*               LISTEN      4361\/rhythmbox\ntcp6       0      0 ::1:631                 :::*                    LISTEN      -\ntcp6       0      0 :::3689                 :::*                    LISTEN      4361\/rhythmbox\nudp        0      0 0.0.0.0:5353            0.0.0.0:*                           3891\/chrome\nudp        0      0 0.0.0.0:5353            0.0.0.0:*                           -\nudp        0      0 0.0.0.0:39223           0.0.0.0:*                           -\nudp        0      0 127.0.1.1:53            0.0.0.0:*                           -\nudp        0      0 0.0.0.0:68              0.0.0.0:*                           -\nudp        0      0 0.0.0.0:631             0.0.0.0:*                           -\nudp        0      0 0.0.0.0:58140           0.0.0.0:*                           -\nudp6       0      0 :::5353                 :::*                                3891\/chrome\nudp6       0      0 :::5353                 :::*                                -\nudp6       0      0 :::41938                :::*                                -\nI'm not sure how to interpret it.    \nthe output of ps aux | grep 8080 \nis :\nshreyash 22402  0.0  0.0  14224   928 pts\/2    S+   01:20   0:00 grep --color=auto 8080\nI don't know how to interpret it.\nWhich one is the the process name and what is it's id?","AnswerCount":4,"Available Count":2,"Score":-0.049958375,"is_accepted":false,"ViewCount":10441,"Q_Id":50891073,"Users Score":-1,"Answer":"You will have another process listening on port 8080. You can check to see what that is and kill it. You can find processes listening on ports with netstat -tulpn. Before you do that, check to make sure you don't have another terminal window open with the running instance.","Q_Score":0,"Tags":"python,flask","A_Id":50891141,"CreationDate":"2018-06-16T19:30:00.000","Title":"How to I close down a python server built using flask","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"When I run this simple code:\nfrom flask import Flask,render_template\napp = Flask(__name__)\n@app.route('\/')\ndef index():\n    return 'this is the homepage'\nif __name__ ==  \"__main__\":\n    app.run(debug=True, host=\"0.0.0.0\",port=8080)\nIt works fine but when I close it using ctrl+z in the terminal and try to run it again I get OSError: [Errno 98] Address already in use\nSo I tried changing the port address and re-running it which works for some of the port numbers I enter. But I want to know a graceful way to clear the address being used by previous program so that it is free for the current one. \nAlso is what is the apt way to shutdown a server and free the port address.\nKindly tell a simple way to do so OR explain the method used fully because I read solutions to similar problems but didn't understand any of it.\nWhen I run\nnetstat -tulpn\nThe output is : \n(Not all processes could be identified, non-owned process info\n will not be shown, you would have to be root to see it all.)\nActive Internet connections (only servers)\nProto Recv-Q Send-Q Local Address           Foreign Address         State       PID\/Program name\ntcp        0      0 127.0.1.1:53            0.0.0.0:*               LISTEN      -\ntcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN      -\ntcp        0      0 0.0.0.0:3689            0.0.0.0:*               LISTEN      4361\/rhythmbox\ntcp6       0      0 ::1:631                 :::*                    LISTEN      -\ntcp6       0      0 :::3689                 :::*                    LISTEN      4361\/rhythmbox\nudp        0      0 0.0.0.0:5353            0.0.0.0:*                           3891\/chrome\nudp        0      0 0.0.0.0:5353            0.0.0.0:*                           -\nudp        0      0 0.0.0.0:39223           0.0.0.0:*                           -\nudp        0      0 127.0.1.1:53            0.0.0.0:*                           -\nudp        0      0 0.0.0.0:68              0.0.0.0:*                           -\nudp        0      0 0.0.0.0:631             0.0.0.0:*                           -\nudp        0      0 0.0.0.0:58140           0.0.0.0:*                           -\nudp6       0      0 :::5353                 :::*                                3891\/chrome\nudp6       0      0 :::5353                 :::*                                -\nudp6       0      0 :::41938                :::*                                -\nI'm not sure how to interpret it.    \nthe output of ps aux | grep 8080 \nis :\nshreyash 22402  0.0  0.0  14224   928 pts\/2    S+   01:20   0:00 grep --color=auto 8080\nI don't know how to interpret it.\nWhich one is the the process name and what is it's id?","AnswerCount":4,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":10441,"Q_Id":50891073,"Users Score":2,"Answer":"It stays alive because you're not closing it. With Ctrl+Z you're removing the execution from current terminal without killing a process.\nTo stop the execution use Ctrl+C","Q_Score":0,"Tags":"python,flask","A_Id":50891134,"CreationDate":"2018-06-16T19:30:00.000","Title":"How to I close down a python server built using flask","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am trying to create an Amazon RDS database from a snapshot but I'm getting this error:\n\nbotocore.errorfactory.KMSKeyNotAccessibleFault: An error occurred (KMSKeyNotAccessibleFault) when calling the RestoreDBInstanceFromDBSnapshot operation: The specified KMS key [arn:aws:kms:ap-southeast-2:ddddddddd] does not exist, is not enabled or you do not have permissions to access it.\n\nI am not sure which permissions are needed for my Jenkins job to run this task. Is it just a read-only IAM policy?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2132,"Q_Id":50905214,"Users Score":3,"Answer":"Go to IAM Console, choose Encryption Keys menu on the left side bar\nChoose the region from the drop down menu (just below the \"Create Key\" button)\nSearch for the the mentioned key and see if exists. \nIf it does not exist, you can never recover back the RDS instance from the snapshot.\nIf exists, \n\nSee whether the status is Enabled for the Key. If not, select the checkbox and Choose \"Actions -> Enable\"\nClick on it. Under \"Key Policy\" -> \"Key Users\", add your IAM user\nand you will be able to restore RDS instance from Snapshot.","Q_Score":2,"Tags":"python-3.x,amazon-web-services,amazon-rds,boto3","A_Id":50906398,"CreationDate":"2018-06-18T08:14:00.000","Title":"Python boto Amazon RDS error: KMSKeyNotAccessibleFault","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to set up a beta environment on Heroku for my Django-based project, but when I install I am getting:\n\nerror in cryptography setup command: Invalid environment marker:\n  python_version < '3'\n\nI've done some googling, and it is suggested that I upgrade setuptools, but I can't figure out how to do that.  (Putting setuptools in requirements.txt gives me a different error message.) \nSadly, I'm still on Python 2.7, if that matters.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":500,"Q_Id":50913601,"Users Score":0,"Answer":"The problem ended up being the Heroku \"buildpack\" that I was using.  I had been using the one from \"thenovices\" for a long time so that I could use numpy, scipy, etc.  \nSadly, that buildpack specifies an old version of setuptools and python, and those versions were not understanding some of the new instructions (python_version) in the newer setup files for cryptography.\nIf you're facing this problem, Heroku's advice is to move to Docker-based Heroku, rather than \"traditional\" Heroku.","Q_Score":0,"Tags":"python,heroku","A_Id":51125635,"CreationDate":"2018-06-18T16:13:00.000","Title":"getting \"invalid environment marker\" when trying to install my python project","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I would like to have all cost and ressources used of each IAM users. \nUnfortunately, i can have only the cost of my master account. I know that i can create a organization and set OU and users AWS account to have a detail and record each events, but the ressources used by 'users' are used only for my application, i don't need to have real account, and i can't automatises all deployements if i must set password and credentials manually . \nOne solutions also is to create CloudTrail and Cloudwatch to record each events services but i found this 'too heavy' and i will need to calculate myself the cost because it only get the datas which are used. \nI would like to know if they are exists others systemes to do that in preference with boto3.\nThank you for your responses. \nHave a nice day\/night.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":123,"Q_Id":50918798,"Users Score":5,"Answer":"Costs are not easily associated back to \"users\".\nAWS resources are associated with an AWS Account. When a user creates a resource (eg an Amazon EC2 instance), IAM will confirm that they have permission to launch the resource, but the resource itself is not associated with the user who created it.\nYou would need to add tags to resources to have more fine-grained association of costs to people\/projects\/departments. These tags can be used in billing reports to provide cost breakdowns.","Q_Score":1,"Tags":"python-3.x,amazon-web-services,boto3","A_Id":50919163,"CreationDate":"2018-06-18T23:37:00.000","Title":"How to get a summary of ressources\/cost used per IAM users in AWS?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"using windows10 python 2.7\nmy code for decryption\n\n\n    def decrypt(self, enc):\n            enc = b64decode(enc)\n            iv = enc[:16]\n            cipher = AES.new(self.key, AES.MODE_CBC, iv)\n            print cipher,\"======\"\n            dec = cipher.decrypt(enc[16:])\n            #print dec,\"========\",dec\n            unp = unpad(dec)\n            print unp,\"=========\",\"=fdkjfsdklfsdjndjdjk\"\n            decode = unp.decode('utf8')\n            #decode = unp.decode('utf8')\n            print decode\n            # unpad(cipher.decrypt(enc[16:])).decode('utf8')\n            return decode\n\n\nwhile decrypting the encrypted response cipher.decrypt(enc[16:]) line gives me below output. But actually It should be the XML format.\n\n )^\u00bb3(Fm\u2560\u00a1O\u00e5\u2524\u2556\u00a2iO\u00d1>s\u258cB\u00bf\u258c\u2565\u2265\u2510\u00c9j6\u256c\u2591\u00a2\u221a(\u00e5\u00a5  2?J\u2264\u00f4GOL\u2550\\\u00a5\u00b0t\u256c\u255a\u0393\u00dc\u2590\u255d\u03a6\u00f7\u2550AQw\u2265[&n\u03a3\u00b1\u0192\u2229(\u2569\u00fbGN~[3bgrHP\u00dc4%\u2556H\u2321\u2584w\u00c5|\u25a0\u00c7q\u2265\u00bd\u00f7\u03c3H\u00f1x\u00ecd\u00baw\u00eb\u00b1!\u2502\u2590\u00edW\u00c7\u00ff\u0398\u2566\u03c3\u2556\u00e8#X\u2593\u25242\u00ff       \u2518\u255f\u0192\u03a3\u00b0Y\u2591\u00e7N\u00df\u00e6\u00c5\u03b1b3f\u00ab\u2500O(Wo9\u2510A\u2555t\u00a3\u2567{K [X\u2534\u252c\u00dcH\u0398\u2320X4\u252c\u00c6\u2261~\u2560h3\u03b5\u2518\u03c3m\u00c9f\u00fa.F\u00fa\u255c\u20a7c!_\u2552\u2590w\u03b1\u00b2A\/\u2552|\u2500sY%=\u2310\u2592Y\u00f6\u2555[\u255e\u03b5\u2591::tA\u2534\u20a7\u00b5\u2264\u00b2\u2219C\u2500A\u2588\u20a7\u2555\u2567\u03c4\u2559x\u2264r\u0192\u00fa\u2591u\u00fa\u2588\u00e5\u252c-\u2564`\u2561f\u2555^\u221et\u03a6\u00bdq\u2557&\u256a\u2500\u2558\u00a5&\u2510\u03a3\u20a7\u258c(\u2559\u250cJ\u00fc\u00f1\u00c7\u00e4Q\u00a5\/*\u00f3\u2590H!C\u252c+\u03b4\u00e0\\Bah\u2558\u00e1\u00c6Xu\u2565C\u2588\u2502\u00bc)\u00eb\u2569\u2553*E(\u00f7\u00b7\u251c\u00e0\u221a\u00bf\u2568\u25671\u0398\u00b70\u2248\u00ba\u00b2\u2551\u00c5s\u252cxO\u00f2}a\u256a\u2554\u256bH\u00dcq\u252cgq\u00c5\u00d6\u23104~v\u2556\u00b79\u2565\u00dc$w\u00e7Z\u258c\u2557\u252c?\u00a0\/Zj12^}&t$F=SBKh\u00f6\u00e5\u03b5 \u00e8\u255do\u256a\u2588\u00ba8f\u00ec\u00ee\u00e9\u256b=\u00ab\u00b7gO:Z\u2562\u22612\u2554K\u00ab\u0398 u\u00e8\/\u2569\u00a0{\u2310\u00c5ww\u03b5^\u03b1\u253c\u00b5k4\u2518\u00d1\u2567:\u019216\u2551\u255e\u207fB\u00b0\u00a2\u00fcd\u00f3?eB\u253cP\u250cL_90]\\5W\u2565\u00b5A\u2310\n    #Mq\u2564\u00ec\u207f\u00b2\u00e7\u2265\u0398\u00b7\u2593F\u20a7\u2580)\u00a0\u00e7@\u00eb\u2552\u2556\u00e0s2\u2561}\u03c0L\u2555\u256860\u00e4\u250c\u00f96\u2592.rn\u2554j\u207fR\u00a2\u2219\u00b5I\u00eb\u00c9\u255d\u00b5\u00e8}c\u2248\u03c3\u00df_\u03b1\u00e4c\u00aa\/\u2564\"lK*\u2514qX2H \u00f6\u03c6q#\u00e2\u00bd\u00e6\u0398j\u00c4% \u00e96#\u00fcY\u2588\u2593aF\u00df\u03b1\u2588\u00f7I\u2551n+\u2321\u2584\u00c4!jT\u00c4\u221a\u2229yr\u00a5d\"\u255b\u00acz\u221a\u207f\u00b5\u00ba\u00bd\u00eaY\u207f\u03c0\u00ac2[\u2555\u00bf\u2261\u00ff \u2502Uv?{\u03c4\u00e6\u03c4\u00b0Q\u00dc\u00c4\u00b5\u2568\u00edkUF\u03c0\u255aB\u03c0\u00c6! Hi\u00e5\u0192\u2552\u00a3\u03b1\u00ec\u2265\u00c6\u03b5tr\u2588[\u2564\u00e0\u00c6\u2588o\u00ed\u03a9(\"\u2524\u255e\u00e5M\u00dc\u00f2\u255dD3\u256c\u00bfV\u03c4\u03a9r\u2593\u00dc\u00c6\u00ff$\u250c)\u2320\u2261\\~\u2569\u2580Rr\u2261y\u00a3\u20a7\u2264\u2551L>\u2559 \u2558\u00b5v9\u00ff\u00e6\u251c@B\u2261\u00b5\u00a3\u2555Ew\u2557y\u00fftXeY.\u03b1\u00d1s\u00fa\u00a0Y\u00b1\u00a3\u2229=yy\u00a5\u00f3\u00fc\u03a3\u00c6F\u2567\u2566\u00e1\u2500}      O\u0192\u2265-9[\u2264\u00a2f\u00fa\u03a3e3&\u00d6\u00ff\u2591\u00ec\u00e7\u00b7nt\u00c4O\n    l\u2219m\u00a5\\\u255e&K\u00ea\u00ebR\u00bbs\u2554E2\u2568\u00aa\u2502OV\u2265\u2591m\u2550\u256c2\u252c\u20a7\u00fa(\u00fb\u00f6z\u00a2\u00bc\u2563\\\u22645nq\u00f2+\u255d\u00b1\u00c4m{G\u03c3\u255dRO\u03c6N\u00b5\u00e0g\u255bRV\u2568;L\u03b4a ,\u00e9\/\u207fY\u255c|\u2524\u00f1\u2554\u00f7\u03c0v\u207f\u255eW\u2593\u03c0}R\u00e5#h$*\u03c0A\u00f2\u00bc2\u255dC\u00c5k*l\"h\u2555\u2265a\u00c6h\u00e6t)9\u2590\u2591\u255d.]B}-\u2562\u2514\u2229I\u03c3w\u252c\u255aD&5\u2261\u2592\u00b2`WJ\u2554\u256b\u2321K1\u2229        f\u00fa~A\u258cc\u2584m\u00d1\u2534?\u00f4Q\u2569\u0192\u207f|\u2568{\u00e7\u2592\u00b7\u0398B\u2561\u03a6\u03c4\u258c\u2320\u2500\u2558q?n\u207fC\/v>\u03c3\u00b0\u252c#'L\u250c 0K\u00e8\u00a3\n    \u2569[\u00c9rekx\u00abw\u00eb,\\\u00a5\u2500K\\a\u2561\u00b7\u2510PDIF\u2569l\u2564YH\u255eF$c6\u2248G\u00a1\u00dcc^r=pbi\u00b5\u03a6\u2518\u00b1\u00ff\u2593z\u03a6\u00bf0\u2591\u00ec\u2510\u00e17\u250co\u25a0\u00ab-\u207f#,\n\nWhile decoding i.e at line unp.decode('utf8') gives me the following error\n\n    Traceback (most recent call last):\n      File \"nic_dycrypt_encrypt.py\", line 99, in \n        print('Ciphertext:', AESCipher(key).decrypt(ciphertext))\n      File \"nic_dycrypt_encrypt.py\", line 86, in decrypt\n        decode = unp.decode('utf8').strip()\n      File \"C:\\Python27\\lib\\encodings\\utf_8.py\", line 16, in decode\n        return codecs.utf_8_decode(input, errors, True)\n    UnicodeDecodeError: 'utf8' codec can't decode byte 0xaf in position 3: invalid start byte\n\nPlease any one help me to know what is that format and why the error is coming and how to resolve","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":739,"Q_Id":50919256,"Users Score":0,"Answer":"Simply put not all bytes and\/or byte sequences map to unicode characters. In fact most byte sequences do not have a UTF-8 character mapping.\nThe common solution is to convert binary to an encoding that can handle all byte values, the most common are Base64 and Hexadecimal.","Q_Score":0,"Tags":"python-2.7","A_Id":50919371,"CreationDate":"2018-06-19T00:55:00.000","Title":"UnicodeDecodeError: 'utf8' codec can't decode byte 0xaf in position 3: invalid start byte in python 2.7","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"i am building a flask RESTapi and i am using postman to make http post requests to my api , i want to use the werkzeug debugger , but postman wont allow me to put in the debugging pin and debug the code from postman , what can i do ?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":331,"Q_Id":50926542,"Users Score":0,"Answer":"Never needed any debugger for postman. This is not the tool you need the long blanket of code for one endpoint to test.\nIt gives a good option - console. I have never experienced any trouble this simple element didn't help me so far.","Q_Score":2,"Tags":"python-3.x,postman,flask-restful,werkzeug","A_Id":50954032,"CreationDate":"2018-06-19T10:47:00.000","Title":"how to use the Werkzeug debugger in postman?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"On my dev machine I installed and configured celery within a django app and it works without issues using python3.5 and the django dev webserver.\nWhen I deploy that app to my production server I get an error \"no module named celery\". On the production server runs python3.6 with apache2 and mod_wsgi.\nOn both machines I use django-1.11 and celery-4.1.0 within a virtualenv. I suspect that it's either an issue with python3.6 or with mod_wsgi.\nI haven't found any real solution to my issue so I'm trying my luck here :)\nCheers\nMichael","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":197,"Q_Id":50929437,"Users Score":0,"Answer":"So, I figured it out. Apparently my virtualenv was pointing to another directory and not to the one apache was using. No idea how this happend. Anyway, after removing and recreating the virtualenv it worked.\nThanks for your help!","Q_Score":0,"Tags":"python,django,celery","A_Id":50931395,"CreationDate":"2018-06-19T13:14:00.000","Title":"No module named celery using python 3.6 and apache2","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"On my dev machine I installed and configured celery within a django app and it works without issues using python3.5 and the django dev webserver.\nWhen I deploy that app to my production server I get an error \"no module named celery\". On the production server runs python3.6 with apache2 and mod_wsgi.\nOn both machines I use django-1.11 and celery-4.1.0 within a virtualenv. I suspect that it's either an issue with python3.6 or with mod_wsgi.\nI haven't found any real solution to my issue so I'm trying my luck here :)\nCheers\nMichael","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":197,"Q_Id":50929437,"Users Score":0,"Answer":"As a sanity check, make sure the celery is actually installed in the virtual environment you use.\nIf you are using virtual environment with mod_wsgi, you may need to setup python-home=<path_to_your_virtual_env> in the WSGIDaemonProcess directive. \n\nExample:\n\nWSGIDaemonProcess django python-path=\/opt\/portal\/src\/ python-home=\/opt\/venv\/django home=\/opt\/portal\/ \n\nYou can use the comma-separated list if more than one directory is required in python-path","Q_Score":0,"Tags":"python,django,celery","A_Id":50930345,"CreationDate":"2018-06-19T13:14:00.000","Title":"No module named celery using python 3.6 and apache2","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"So I am new to Python (and programming in general) and I am trying to install it on my Mac. Forgive me if I might ask silly questions.\nI currently have Python 3.6 and django 2.0 installed with it\n- I just installed virtualenv and pipenv which I don't get the difference but my terminal says that those scripts are not on PATH. How do I add those directories to the PATH and how can I check that they are on the right path?\nDo I need something more before starting to code?\nThanks!","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":1786,"Q_Id":50943130,"Users Score":1,"Answer":"You need to add those directories to your PATH variable. Thus you can use them on shell without writing directories all the time.\necho 'export PATH=YOUR_VIRENV_PATH:$PATH' >> ~\/.profile","Q_Score":0,"Tags":"python,django,path,installation,virtualenv","A_Id":50943712,"CreationDate":"2018-06-20T07:57:00.000","Title":"Scripts for Python are not on PATH","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have to write automation scripts using python and Robot framework. I have installed python, Robotframework, RIDE, wxpython. I have installed sikuli library but when I import it in my project, library is not imported. I have tried 'Import Library Spec XML'. My question is from where do I import this .xml or how do I create it?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1441,"Q_Id":50949412,"Users Score":0,"Answer":"First check whether Sikuli is installed in python directory's \\Lib\\site-packages.\nRobot test should contain as below:\n* Settings *\nDocumentation     Sikuli Library Demo\nLibrary           SikuliLibrary    mode=NEW\n* Test Cases *\nSample_Sikuli_Test\nblabh blabh etc","Q_Score":0,"Tags":"python-2.7,robotframework,sikuli","A_Id":51034898,"CreationDate":"2018-06-20T13:27:00.000","Title":"Unable to import sikuli library in RIDE","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using Python Django. I want to have a dynamic homepage. To be exact, I want to show different lists of books. For example one list might be best sellers and the other might be old books. These lists could be added in the future and I need them to be dynamic. Each list has a title and a queryset corresponding to books within that list. What is the best practice to handle this? What should be the properties of my List model?\nUpdate\nThe thing is that I do not want to change my front-end design each time that I might have a new list. These lists should be dynamic. For example, I might want to add a new list let's say top of 2018 and I know what the queryset is. I want to have a model such that every instance of that model corresponds to one of these lists and then the only thing I need to do is to create a new instance which has the queryset and title of the list. Then I want my website to return all of these lists when some one requests to get the home page.","AnswerCount":3,"Available Count":1,"Score":-0.0665680765,"is_accepted":false,"ViewCount":39,"Q_Id":50959469,"Users Score":-1,"Answer":"Sorry not going to give you any code as I am not going to do the work for you. I would suggest you think about how you would want to design your database. \nFor example, do you want just one model that has all the books and than has a couple fields that indicate if it is a \"best seller\" or considered an \"old book\". \nSo for this case, to find \"old books\" you might want a timestamp field and then run a query that considers books passed a certain date to be old. That could be one list.\nFor best sellers, you could have a boolean field where you yourself indicate if that book is a best seller. Then you run a query filtering by that boolean field. That could be another list.\nSo just think of what are the exact lists you want, and how could you efficiently query for this for this.","Q_Score":0,"Tags":"python,django,design-patterns","A_Id":50959754,"CreationDate":"2018-06-21T02:24:00.000","Title":"Create a model filed which corresponds to a queryset","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Docker image which runs a python subprocess, which is a node.js server exposing an end point \/check. The whole thing is put inside a Kubernetes pod and uses \/check as the readinessProbe endpoint.\nNow at some point, I want to close this endpoint or force-fail all the requests coming at it. Ideally, I want to do this via higher-level entities (i.e. Kubernetes lifecycle hooks) so as not to touch the lower-level implementation (such as opening a new endpoint \/stop that switch some boolean flag and force the \/check to fail)\nIs that possible at all? If not, what is the best alternative?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":50,"Q_Id":50966018,"Users Score":1,"Answer":"Is that possible at all? If not, what is the best alternative?\n\nI believe there are a few:\n\nremote address filtering\nmagic headers\na formal proxy container\n\nremote address\nRequests to \/check coming from kubernetes will come from the Node's SDN IP address (so if a Node's SDN subnet is 10.10.5.0\/24, then requests will come from 10.10.5.1), so you could permit the checks from the .1 of the \/24 assigned to the Pod\nmagic headers\nThe httpGet readinessProbe allows httpHeaders: so you could turn on HTTP Basic auth for \/check and then put the - name: Authentication value: Basic xxyyzz== in the httpHeaders:\na formal proxy container\nAdd a 2nd container to the Pod that runs haproxy and filters \/check requests to return 401 or 404 or whatever you want. Since all containers in a Pod share the same networking namespace, configuring haproxy to speak to your node.js server will be super trivial, and your readinessProbe (as well as liveliness) can continue to use the URL because only kubernetes will have access to it by using the non-haproxy container's port. To complete that loop, point the Service at the haproxy container's port.","Q_Score":0,"Tags":"python,node.js,docker,kubernetes","A_Id":50981018,"CreationDate":"2018-06-21T10:15:00.000","Title":"Close off an endpoint on node.js server by via Kubernetes","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I just started learning Django, and not able to understand that what is the actual difference between URL and path in Django.","AnswerCount":3,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":5998,"Q_Id":50980660,"Users Score":3,"Answer":"I know that this is an older question, but to answer the question directly:\n\nSince Django 2.0, the url() function is an alias to django.urls.re_path()\nAnd, it is listed as deprecated since Django 3.1.\n\nSo, you should use either path() or re_path() moving forward, depending on which meets your needs.","Q_Score":4,"Tags":"python,django","A_Id":69890081,"CreationDate":"2018-06-22T04:24:00.000","Title":"difference between URL and path in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"when i run python manage.py makemigrations and migrate every thing is ok and changes are made but process does not end and I must press control+z to end process \nwhy this happend??\nis it normal?\ndb backend : mysql\npython 2.7 \ndjango 1.11\nOS: ubuntu 16.04 TLS\nEDIT: because threading I using threading and it make problem in migration and makemigration","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":479,"Q_Id":50985703,"Users Score":0,"Answer":"In my case the problem was, that I have started a thread from views.py. And this thread was running forever. Django could not end, inclusing the migration calls, until this thread was ended. Removing the thread solved the problem.","Q_Score":1,"Tags":"python,django,django-migrations,django-1.11","A_Id":66969160,"CreationDate":"2018-06-22T10:13:00.000","Title":"django : makemigrations process does not end","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I used pip install django-celeryand pip3 install django-celery in Pycharm.\nAfter that I use import djcelery,but Pycharm reminds me no module named djcelery.\nThen I used pip list I can see django-celery          3.2.2   in the list.\nBut when I went to virtual environment path myenv\/lib\/site-packages where I can see all the module or app that I have installed such as django-pure-pagination.But I can't find django-celery there.\nAny friend has any idea, how to fix it?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":97,"Q_Id":50993171,"Users Score":2,"Answer":"Seems like you've installed django-celery in another environment. Try to install it with PyCharm:\n\nFile > Settings > Project > Project Interpreter.","Q_Score":0,"Tags":"python,django,django-models,pycharm,django-celery","A_Id":50993837,"CreationDate":"2018-06-22T17:43:00.000","Title":"module can't be installed in Django virtual environment","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How can I send POST request with a csv or a text file to the server running on a localhost using cURL. \nI have tried curl -X POST -d @file.csv http:\/\/localhost:5000\/upload but I get \n\n{\n      \"message\": \"The browser (or proxy) sent a request that this server could not understand.\"\n  }\n\nMy server is flask_restful API. Thanks a lot in advance.","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":23637,"Q_Id":50998620,"Users Score":2,"Answer":"Curl's default Content-Type is application\/x-www-form-urlencoded so your problem is probably that the data you are POSTing is not actually form data. It might work if you set the content type header properly:\n\n-H \"Content-Type: text\/csv\"\n\nThough it does depend on the server.","Q_Score":14,"Tags":"python-3.x,curl,flask,flask-restful","A_Id":50998749,"CreationDate":"2018-06-23T06:36:00.000","Title":"POST csv\/Text file using cURL","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am making a PWA for a friend. the database has users and the users have json strings associated with them. I know that I can just ask the database for that user's Json in html or js, but I want to know if its possible to have the database look at that json String, and automatically divvy out the details in it to the database say every hour. \nI know there is a simpler way of just putting the json string in the database under the user, then just parsing it when the user logs into the page and asks for it. just wondering if I can skip a step and just make the database auto update the json string into the DB itself.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":34,"Q_Id":51024428,"Users Score":0,"Answer":"Yes, you may use crontab to schedule tasks for your system to complete. Update the database information using one of these tasks. You may also use Celery, but crontab is easier to implement.","Q_Score":0,"Tags":"python,sql,json,django,pwa","A_Id":51025459,"CreationDate":"2018-06-25T13:16:00.000","Title":"Json Database. I want to get a number from a json string and put it into a database.","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a html page with text box and submit button. When somebody enters data in text box and click submit, i have to pass that value to a python script which does some operation and print output. Can someone let me now how to achieve this. I did some research on stackoverflow\/google but nothing conclusive. I have python 2.7, Windows 10 and Apache tomcat. Any help would be greatly appreciated.\nThanks,\nJagadeesh.K","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":222,"Q_Id":51024719,"Users Score":0,"Answer":"Short answer:  You can't just run a python script in the clients browser.  It doesn't work that way.\nIf you want to execute some python when the user does something, you will have to run a web app like the other answer suggested.","Q_Score":0,"Tags":"python,windows,apache,flask","A_Id":51027426,"CreationDate":"2018-06-25T13:30:00.000","Title":"Passing command line parameters to python script from html page","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was using scrapy framework which is running fine. But suddenly today when i crawl my spider, i experience this error\n\n2018-06-25 21:33:22 [scrapy.utils.log] INFO: Scrapy 1.5.0 started\n  (bot: sam_amazon) Traceback (most recent call last):   File\n  \"C:\\Users\\sa\\Anaconda3\\Scripts\\scrapy-script.py\", line 5, in \n      sys.exit(scrapy.cmdline.execute())   File \"C:\\Users\\sa\\Anaconda3\\lib\\site-packages\\scrapy\\cmdline.py\", line 149,\n  in execute\n      cmd.crawler_process = CrawlerProcess(settings)   File \"C:\\Users\\sa\\Anaconda3\\lib\\site-packages\\scrapy\\crawler.py\", line 252,\n  in init\n      log_scrapy_info(self.settings)   File \"C:\\Users\\sa\\Anaconda3\\lib\\site-packages\\scrapy\\utils\\log.py\", line\n  149, in log_scrapy_info\n      for name, version in scrapy_components_versions()   File \"C:\\Users\\sa\\Anaconda3\\lib\\site-packages\\scrapy\\utils\\versions.py\",\n  line 35, in scrapy_components_versions\n      (\"pyOpenSSL\", _get_openssl_version()),   File \"C:\\Users\\sa\\Anaconda3\\lib\\site-packages\\scrapy\\utils\\versions.py\",\n  line 43, in _get_openssl_version\n      import OpenSSL   File \"C:\\Users\\sa\\Anaconda3\\lib\\site-packages\\OpenSSL__init__.py\", line 8,\n  in \n      from OpenSSL import crypto, SSL   File \"C:\\Users\\sa\\Anaconda3\\lib\\site-packages\\OpenSSL\\crypto.py\", line 16,\n  in \n      from OpenSSL._util import (   File \"C:\\Users\\sa\\Anaconda3\\lib\\site-packages\\OpenSSL_util.py\", line 6, in\n  \n      from cryptography.hazmat.bindings.openssl.binding import Binding   File\n  \"C:\\Users\\sa\\Anaconda3\\lib\\site-packages\\cryptography\\hazmat\\bindings\\openssl\\binding.py\",\n  line 13, in \n      from cryptography.hazmat.bindings._openssl import ffi, lib ImportError: DLL load failed: The operating system cannot run %1.\n\nI have tried to uninstall and install scrapy again. But it did not work. Please help. I am stuck with this error.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":474,"Q_Id":51027761,"Users Score":0,"Answer":"My Problem is solved by installing the previous version of openssl.","Q_Score":0,"Tags":"python,scrapy","A_Id":51040202,"CreationDate":"2018-06-25T16:10:00.000","Title":"Suddenly, scrapy stops working","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I successfully added a new JDBC interpreter to my preferred DB, by using the normal zeppelin UI. It works. My Zeppelin is running on a docker container on my machine. I noticed it added my interpreter configuration to \/zeppelin\/conf\/interpreter.json file.\nI extracted the piece of json that was inserted on the file, under interpreterSettings collection. I built a script that would programmatically add that json block to \/zeppelin\/conf\/interpreter.json so that my container would start with that interpreter configured out of the box.\nBut after I run my script on a brand new Zeppelin container what happen is that:\n 1) it works - the piece of json is successfully inserted into \/zeppelin\/conf\/interpreter.json\n 2) Zeppelin won't show my interpreter on its UI\nWhat else must I do to programmatically add this interpreter to my Zeppelin container?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":351,"Q_Id":51055457,"Users Score":0,"Answer":"I believe you approach will work in new version 0.8.0. In 0.8.0 interpreter ID equals interpreter name.\nIn previous versions interpreters have unique ID and this maybe reason of your question.\nRemember that Zeppelin server must be off while editing conf\/interpreter.json","Q_Score":0,"Tags":"python,docker,jdbc,interpreter,apache-zeppelin","A_Id":51195921,"CreationDate":"2018-06-27T05:56:00.000","Title":"How to add a new jdbc interpreter to Zeppelin by editing its conf\/interpreter.json file?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I successfully added a new JDBC interpreter to my preferred DB, by using the normal zeppelin UI. It works. My Zeppelin is running on a docker container on my machine. I noticed it added my interpreter configuration to \/zeppelin\/conf\/interpreter.json file.\nI extracted the piece of json that was inserted on the file, under interpreterSettings collection. I built a script that would programmatically add that json block to \/zeppelin\/conf\/interpreter.json so that my container would start with that interpreter configured out of the box.\nBut after I run my script on a brand new Zeppelin container what happen is that:\n 1) it works - the piece of json is successfully inserted into \/zeppelin\/conf\/interpreter.json\n 2) Zeppelin won't show my interpreter on its UI\nWhat else must I do to programmatically add this interpreter to my Zeppelin container?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":351,"Q_Id":51055457,"Users Score":0,"Answer":"My problem was happening because after the Zeppelin container started, it was already too late. Zeppelin service was up and running and it would have already loaded interpreter.json. So, what I did was to configure my Dockerfile ENTRYPOINT to a script of mine, overwriting the standard Zeppelin container's entry point. My script would do the injection of the additional configurations I needed on interpreter.json file and call \/zeppelin\/bin\/zeppelin.sh to start zeppelin.\nThis way, I could do whatever I want with the configuration files BEFORE Zeppelin was actually started inside the container. \nKind regards,\nAS","Q_Score":0,"Tags":"python,docker,jdbc,interpreter,apache-zeppelin","A_Id":51215244,"CreationDate":"2018-06-27T05:56:00.000","Title":"How to add a new jdbc interpreter to Zeppelin by editing its conf\/interpreter.json file?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am making a school-related app for school using Python and the PeeWee module. Everything is working fine, but the problem I am facing is as follows:\nWhen creating user accounts, a student account can ONLY be created if there is at least 1 teacher account in the database (every student gets a teacher assigned). How do I check if my teacher table has any instances? I want to check this before a student user account can be made.\nThanks in advance!","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":385,"Q_Id":51055956,"Users Score":0,"Answer":"If I understand your problem clearly then it seems you need foreign key in student table. If you have column like teacher_id in student table then do the below steps\n\nCreate primary key for id in teacher table\nCreate foreign key for teacher_id in student table and teacher_id is not null\n\nOnce you have foreign key in student table then database will automatically will check teacher exists or not. if teacher not exists then it will throw error.","Q_Score":0,"Tags":"python,database,peewee","A_Id":51061550,"CreationDate":"2018-06-27T06:29:00.000","Title":"Checking if a table has records - Peewee module","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"If I change the model fields attributes in django should I remigrate them? will it afftect the data that is already stored there? is it safe to make that change in an already running project?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":258,"Q_Id":51081200,"Users Score":0,"Answer":"If I change the model fields attributes in django should I remigrate them? \n\nYes of course. Until you're willing to throw away your whole existing database,  that is.\n\nwill it afftect the data that is already stored there?\n\nDepends on your exact changes (some field attributes like blank or editable won't impact the db schema at all, only the Django code).\nNow if your schema changes are to affect your data, you can write data migrations too  \n\nis it safe to make that change in an already running project?\n\nWell that's what migrations (schema and data migrations) are for: having a safe, reliable, repetible, testable way to alter your db schema.","Q_Score":0,"Tags":"python,django","A_Id":51081343,"CreationDate":"2018-06-28T10:59:00.000","Title":"Django change model fields attributes?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to speed up the loading time for pages on selenium because I don't need anything more than the HTML (I am trying to scrape all the links using BeautifulSoup). Using PageLoadStrategy.NONE doesn't work to scrape all the links, and Chrome no longer supports PageLoadStrategy.EAGER. Does anyone know of a workaround to get PageLoadStrategy.EAGER in python?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":6458,"Q_Id":51087832,"Users Score":1,"Answer":"You only use normal or none as the pageLoadStrategy in chromdriver. So either choose none and handle everything yourself or wait for the page load as it normally happens","Q_Score":3,"Tags":"python-3.x,selenium,web-scraping,selenium-chromedriver,pageloadstrategy","A_Id":51088883,"CreationDate":"2018-06-28T16:41:00.000","Title":"\"Eager\" Page Load Strategy workaround for Chromedriver Selenium in Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am implementing soap toolkit api. After submitting credit card info it redirects me towards the 3rd party page to get the password. I want to avoid that redirection is it possible to load that page within my domain or on my custom page using IFRAME.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":150,"Q_Id":51091419,"Users Score":0,"Answer":"Not exactly an answer but more of a request for clarifying information: When you say \"it redirects me towards the 3rd party page to get the password\", are you talking about the 3D-Secure process?  I think I understand what you are trying to accomplish, but in order to use 3D Secure, I think the idea is to guide the end-user through the process of the additional Verification (security) process. So I think the redirection is required as a matter of how the Business Process (or 3D-Secure) works.","Q_Score":0,"Tags":"python,soap-client,cybersource","A_Id":51107797,"CreationDate":"2018-06-28T21:22:00.000","Title":"Cybersource soap toolkit api avoid redirection on 3rd party domain","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I package my python (flask) application with docker. Within my app I'm generating UTC date with datetime library using datetime.utcnow().\nUnfortunately, when I inspect saved data with MongoDB Compass the UTC date is offset two hours (to my local time zone). All my docker containers have time zone set to Etc\/UTC. Morover, mongoengine connection to MongoDB uses tz_aware=False and tzinfo=None, what prevents on fly date conversions.\nWhere does the offset come from and how to fix it?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":5085,"Q_Id":51098943,"Users Score":15,"Answer":"Finally, after trying to prove myself wrong, and hairless head I found the cause and solution for my problem. \nWe are living in the world of illusion and what you see is not what you get!!!. I decided to inspect my data over mongo shell client\nrather than MongoDB Compass GUI. I figure out that data that arrived to database contained correct UTC date. This narrowed all my previous\nassumption that there has to be something wrong with my python application, and environment that the application is living in. What left was MongoDB Compass itself.\nAfter changing time zone on my machine to a random time zone, and refreshing collection within MongoDB Compass, displayed UTC date changed to a date that fits random time zone. \nBe aware that MongoDB Copass displays whatever is saved in database Date field, enlarged about your machine's time zone. Example, if you saved UTC time equivalent to 8:00 am, \nand your machine's time zone is Europe\/Warsaw then MongoDB Compass will display 10:00am.","Q_Score":5,"Tags":"python,mongodb,docker,mongoengine,mongodb-compass","A_Id":51099120,"CreationDate":"2018-06-29T09:49:00.000","Title":"Incorrect UTC date in MongoDB Compass","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I\u2019m working on a functionality where I need to convert a huge html file (size more than 1 mb) into pdf. I\u2019ve tried below two open-source python libraries.\n1.  Xhtml2pdf (Pisa)\n2.  Weasyprint\nBut none of them solves my problem as they take around 4-5 mins in generating 1 MB PDF file (around 500 pages) causing my app server\u2019s worker process (Gunicorn and Nginx) to get down and throwing \u2018GATEWAY TIMEOUT ERROR\u2019 on browser. CPU utilization also goes up to 100% while PDF conversion is in process.\nIf anybody is having any idea which API\/library will be a best suit for large html files.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":339,"Q_Id":51100005,"Users Score":1,"Answer":"Generating a 500 pages PDF will take time whatever technologie you use, so the solution is to send the job to an async task queue (celery, huey, django-queue, ...), eventually with some polling to show a progressbar. Even if you manage to optimize the crap out of the generation process, it will STILL takes too much time to fit in an HTTP request\/response cycle (from the user's POV at least even one minute is already way to long) \nNB : having your CPU maxing out is nothing surprising either - generating a huge PDF not only takes time, it's also a computation-heavy process, and one that easily eats your memory too. This by itself is another reason to use a distributed task queue so you can run the process on a distinct node and avoid killing your front server).","Q_Score":0,"Tags":"python,html,django,unix,pdf","A_Id":51100551,"CreationDate":"2018-06-29T10:48:00.000","Title":"Convert Html to PDF Python\/Django on Unix Platform","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I had implemented my project along with daily commits to Github, which is a website implemented using Flask and Python, while daily commits I used to    git add --a, thus it has added all folders like __pycache__ and flask_session. I think it is safe to delete those from my Github, Is it so? If not why?","AnswerCount":3,"Available Count":2,"Score":0.1973753202,"is_accepted":false,"ViewCount":2564,"Q_Id":51112474,"Users Score":3,"Answer":"In layman language, YES because these things can be generated again by Flask thus it's good practise to not push it to a repo and generate locally individually.","Q_Score":6,"Tags":"python,git,github,flask","A_Id":59296998,"CreationDate":"2018-06-30T06:47:00.000","Title":"git-flask-python : Is it safe to remove pycache and flask session folders","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I had implemented my project along with daily commits to Github, which is a website implemented using Flask and Python, while daily commits I used to    git add --a, thus it has added all folders like __pycache__ and flask_session. I think it is safe to delete those from my Github, Is it so? If not why?","AnswerCount":3,"Available Count":2,"Score":0.1973753202,"is_accepted":false,"ViewCount":2564,"Q_Id":51112474,"Users Score":3,"Answer":"Both these folders contain temporary objects that are created in runtime, and there's no point in committing them to git.\nI'd remove those folders from your repository and then add them to .gitignore to prevent them from being re-added there by mistake.","Q_Score":6,"Tags":"python,git,github,flask","A_Id":51112501,"CreationDate":"2018-06-30T06:47:00.000","Title":"git-flask-python : Is it safe to remove pycache and flask session folders","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Im making a web application using flask api. When a user is created, a folder is created for them on the file system. They use this for uploading their own images. When uploding the image path is stored in the db. My problem is that this image path should only be allowed for that specific user. The paths gets returned by the api, but If known everyone can request the image src. How can i restrict that to the owner only?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":235,"Q_Id":51112711,"Users Score":1,"Answer":"Set an owner_ID to each link entry in DB.\nThan you can selecet the link by link_id and owner_ID.\nIf the curr user not the user of the directory you can return a permission_denied(403)","Q_Score":0,"Tags":"python,flask","A_Id":51112855,"CreationDate":"2018-06-30T07:23:00.000","Title":"Protect image path in Flask API","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Im using Django Channels (and loving it) but new consumers to the layer only see data from the time they join into the future.  Is there a way for new consumers to see previous data belonging to the layer?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":62,"Q_Id":51117355,"Users Score":0,"Answer":"You need to send the existing data either from something like the database or the cache. Do this on the connect method of the consumer. If you are using async methods you must always use an async library for IO or wrap the IO in sync_to_async or database_sync_to_async. This is so you don't block the event loop.","Q_Score":0,"Tags":"python,django,django-channels","A_Id":51144230,"CreationDate":"2018-06-30T18:04:00.000","Title":"Allow New Consumer To See Existing Data in Django Channels Layer","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a game where I've (foolishly) made the db key equal to the users login email.  I did this several years ago so I've got quite a few users now. Some users have asked to change their email login for my game.  Is there a simple way to change the key?  As far as I can tell I'd need to make a new entry with the new email and copy all the data across, then delete the old db entry. This is the user model but then I've got other models, like one for each game they are involved in, that store the user key so I'd have to loop though all of them as well and swap out for the new key. \nBefore I embark on this I wanted to see if anyone else had a better plan. There could be several models storing that old user key so I'm also worried about the process timing out. \nIt does keep it efficient to pull a db entry as I know the key from their email without doing a search, but it's pretty inflexible in hindsight","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":191,"Q_Id":51127822,"Users Score":0,"Answer":"I ended up adding a new property to my user model and running a crawler to copy the string key (the email) to that new property. I changed my code search for that property rather then the key string to get a user item.  Most of my users still have keys that equal their email, but I can safely ignore them as if the string is meaningless.  I can now change a users email easily without making a new recored and my other models that have pointers to these user keys can remain unchanged.","Q_Score":1,"Tags":"google-app-engine,app-engine-ndb,google-app-engine-python","A_Id":51229386,"CreationDate":"2018-07-01T23:56:00.000","Title":"Change appengine ndb key","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I need to make a simple API using Python.\nThere are many tutorials to make a REST API using Django REST framework, but I don't need REST service, I just need to be able to process POST requests.\nHow can I do that? I'm new to Python.\nThank you!","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":5025,"Q_Id":51134093,"Users Score":0,"Answer":"Well if you don't need the whole DRF stuff than just don't use it. \nDjango is built around views  which take HTTP requests (whatever the verb - POST, GET etc) and return HTTP responses (which can be html, json, text, csv, binary data, whatever), and are mapped to urls, so all you have to do is to write your views and map them to url.","Q_Score":0,"Tags":"python,django,api,post","A_Id":51134824,"CreationDate":"2018-07-02T10:30:00.000","Title":"Python simple API application without Django REST framework","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"When I first execute this command it create model in my model.py but when I call it second time for  another table in same model.py file then that second table replace model of first can anyone told the reason behind that because I am not able to find perfect solution for that?\n$ python manage.py inspectdb tablename > v1\/projectname\/models.py\nWhen executing this command second time for  another table then it replace first table name.\n$ python manage.py inspectdb tablename2 > v1\/projectname\/models.py","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1132,"Q_Id":51137859,"Users Score":0,"Answer":"python manage.py inspectdb table1 table2 table3... > app_name\/models.py\nApply this command for inspection of multiple tables of one database in django.","Q_Score":1,"Tags":"django,python-3.x","A_Id":58061835,"CreationDate":"2018-07-02T13:55:00.000","Title":"django inspectdb, how to write multiple table name during inspection","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have been asked to create a system which has different functionalities. Assume service 1, service 2 and service 3. I need to run these services per hour to do something. \nTo make the system of those services I need: database, web interface for seeing the result of the process, caching and etc.\nThis is what I have thought about so far:\n\nI need kubernetes to orchestrate my services which are packaged as docker containers. I will deploy mySql to save my data and I can use Redis cache for caching.\nMy service are written by python scripts and Java and need to interact with each other through APIs.\nI think I can use AWS EKS for my kubernetes cluster \n\n\nthis is what I need to know: \n\nhow to deploy python or Java applications and connect them to each other and also connect them to a database service\nI also need to know how to schedule the application to run per hour so I can see the results in the web interface.\n\nPlease shoot any ideas or questions you have. \nAny help would be appreciated.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":42,"Q_Id":51164215,"Users Score":1,"Answer":"For python\/java applications, create docker images for both applications. If these application run forever to serve traffic then deploy them as deployments.If you need to have only cron like functionality, deploy as  Job in kubernetes.\nTo make services accessible, create services as selector for applications, so these services can route traffic to specific applications.\nDatabase or cache should be exposed as service endpoints so your applications are environment independent.","Q_Score":0,"Tags":"java,python,docker,kubernetes","A_Id":51166017,"CreationDate":"2018-07-04T00:03:00.000","Title":"kubernetes architecture for microservices application - suggestions","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I accidentally deleted my migrations folders for all my apps including __init__.py. Is there any way to reset or retrieve these? Thank you!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":4733,"Q_Id":51174718,"Users Score":12,"Answer":"Just create migrations folder the folder again, then create __init__.py file. After that run manage.py makemigrations","Q_Score":3,"Tags":"python,django","A_Id":51175021,"CreationDate":"2018-07-04T13:20:00.000","Title":"Deleted Django Migrations Folder","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working in a project that retrieves some data from a rest service. One of the retrieved fields is a department number that need to be searched in a set of data in order to get the department name. That set of data has been given to me in a csv file (at least is not excel) with 1200 records.\nThe dataset is fixed and will not be updated (let's assume that's true) and the project doesn't have a database.\nSo I'm looking for the best alternative for storing this set: could be a hard coded dictionary or sqlite, what do you think? is there a better alternative?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":64,"Q_Id":51178233,"Users Score":2,"Answer":"For a REST service, storing the data in sqlite is better because loading 1200 records from a hard-coded python dict creates overhead in both memory and loading time every time your REST service is called. sqlite is fully indexed on the filesystem so all data retrieval will be on an as-needed basis, which will create only a minimal overhead to each of your REST service call.","Q_Score":0,"Tags":"python,django","A_Id":51178409,"CreationDate":"2018-07-04T16:58:00.000","Title":"Store fixed data in Django: dictionary or sqlite?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have deployed my django application to a CentOS server and everything is working fine. I can see the list of users and groups from the Django Administration page. I was able to add\/edit users as well before. But now, when I'm trying to add new user, an Server Error (500) is returned. \nIs there any limitations about the number of users can be added using Django Admin page?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":349,"Q_Id":51179393,"Users Score":0,"Answer":"run:- python manage.py makemigrations and python manage.py migrate if you add any model","Q_Score":0,"Tags":"python,django","A_Id":51179502,"CreationDate":"2018-07-04T18:37:00.000","Title":"Django administration add user returns Server Error (500)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have the code ...\nplugins.TimestampedGeoJson (\n        {\n                'type': 'FeatureCollection',\n                'features': features\n        },\n        period = 'PT1M',\n        transition_time = 100,\n        loop = False,\n        auto_play = False,\n        duration = 'PT1M'\n).add_to(m)\nand I'm getting the error message ...\nTypeError: init() got an unexpected keyword argument 'duration'\nThe same happens with the parameter time_slider_drag_update. The map and time animation works fine without these parameters but I'm getting a stack of markers on top of each other because I'm not removing the markers after the timestamp has finished if that makes sense. I want the map to refresh not build.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":249,"Q_Id":51215496,"Users Score":0,"Answer":"The duration parameter was added to the TimestampedGeoJson plugin in version 0.6.0. Double-check the version of folium you're using with pip freeze | grep folium and if it's < 0.6 then upgrade it with pip install -U folium.","Q_Score":0,"Tags":"python,geojson,folium","A_Id":52014346,"CreationDate":"2018-07-06T17:47:00.000","Title":"duration parameter not working with Folium plugin timestampedGeoJson","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I cloned a Github Repository into Colaboratory although it was cloned but i couldn't view it in that particular folder. I changed into \"drive\" as my working directory but i don't know which directory is that on drive. I moved into drive folder and viewed it's contents, it was present in the drive folder. Please tell me which is the drive folder on Google Drive. Thanks in advance.","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2646,"Q_Id":51234981,"Users Score":0,"Answer":"Try to change Run type to GPU and retry the clone.\nI met the same problem when using default Jupyter notebook.","Q_Score":0,"Tags":"python,google-colaboratory,google-drive-shared-drive","A_Id":58157262,"CreationDate":"2018-07-08T18:37:00.000","Title":"Can't view Github Repos after cloning them into Colaboratory","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am currently interesting in web development using python language, but evertime I'm searching for reference, we only given two frameworks option between Django and flask. Can we just develop web app without using any of those framework","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":354,"Q_Id":51237088,"Users Score":1,"Answer":"Yes, you can build a web-app using no framework. However it will require you writing a large amount of boiler plate code to send, receive, and parse HTTP data. It is generally highly recommended that you use a framework in order to save yourself a large amount of time and effort, and to ensure the product that you build is good quality.\nYou will also struggle to find resources on building a web-app without a framework, while there are a wealth of resources available for working with existing frameworks.","Q_Score":0,"Tags":"python,web-applications,frameworks","A_Id":51237133,"CreationDate":"2018-07-09T00:53:00.000","Title":"Is it possible to build a python web app without any framework?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In my python code, I need to kill any java.exe subprocess, I am using subprocess.call(\"taskkill \/f \/im java.exe\"), this is working fine when java.exe subprocess exists but it failed with \"ERROR: The process \"java.exe\" not found\" if java.exe subprocess does not exist, so I want to know if there is any way to detect if any java.exe subprocess is running and then try to kill it.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":214,"Q_Id":51261815,"Users Score":0,"Answer":"You can use subprocess.call to run tasklist or wmic process get description first to get a full list of running processes and see if java.exe is among them.","Q_Score":0,"Tags":"python,subprocess","A_Id":51262036,"CreationDate":"2018-07-10T09:34:00.000","Title":"How to conditionally use subprocess.call(\"taskkill \/f \/im java.exe\")","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I recently started having a need for a task queue in my Django program, and I'm worried about how robust it will be in the future or what will need to be overcome for a production deployment. \nI'm using the Redis-Queue or RQ library for Python, which markets itself as easier to learn and use than something like Celery (which I haven't quite learned). Does anyone have any input on this? Do you think RQ coupled with Redis would be OK in production, or would you use something else? What do large-scale apps use for task queueing?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1130,"Q_Id":51299464,"Users Score":0,"Answer":"Celery works in production, as far as I know, for Python\/Django, the most mature implementation of synchronous task queue\/job queue based on distributed message passing, with Redis as a broker works just fine.\nWhat you would need in production is not only send a simple message but a high-level API for:\n\nScale, auto-scale.\nReal-time monitor.\nTask schedulers.\nPrioritization.\nMulti broker support.\nWorkflow based tasks.\n\nFor which Celery is ready.","Q_Score":0,"Tags":"python,django,redis,task,production-environment","A_Id":51302458,"CreationDate":"2018-07-12T07:17:00.000","Title":"Redis-Queue (RQ) Task Queues in Production","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I recently started having a need for a task queue in my Django program, and I'm worried about how robust it will be in the future or what will need to be overcome for a production deployment. \nI'm using the Redis-Queue or RQ library for Python, which markets itself as easier to learn and use than something like Celery (which I haven't quite learned). Does anyone have any input on this? Do you think RQ coupled with Redis would be OK in production, or would you use something else? What do large-scale apps use for task queueing?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1130,"Q_Id":51299464,"Users Score":0,"Answer":"Yes, redis and redis-queue is very easy to setup. And yes, they can be used in a production system. You can also take a look at RabbitMQ. It can be used as task queue. It support persistence and clustering for scaling.","Q_Score":0,"Tags":"python,django,redis,task,production-environment","A_Id":51316460,"CreationDate":"2018-07-12T07:17:00.000","Title":"Redis-Queue (RQ) Task Queues in Production","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I just upgraded to python 3.7 and I realized that all my modules stuck with the previous version. Even Django is not recognised anymore. How can I do to transfer everything to the new version? I am a little lost right now, don't even know where the new version has been installed.\nEdit:\nWhen I do $ which python3.6 the terminal tells me it doesn't exist, but I have a python3.6 directory in \/usr\/local\/lib\/, where all modules are installed.\nIn the same directory \/usr\/local\/lib\/ I also have a python3.7 directory with some modules installed but many are missing. However when I search for the file python3.7 in my finder it doesn't appear. when I do $ which python3.7 the path is \/usr\/local\/bin so not the same path as the directory.\nAnyone sees what happened and knows how I can transfer all modules to python3.7?","AnswerCount":7,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":21318,"Q_Id":51308683,"Users Score":0,"Answer":"I faced a similar problem, now that I upgraded from python 3.7 to python 3.8 (new)\nI installed Python 3.8, but the system kept the python37 subfolder with the already installed packages(...\\Python37-32\\Lib\\site-packages)  even with the  Pyhton38 subfolder created, with the new python.exe.\nUsually, it's possible to keep on using the old libraries on your new Python version, because the existent libraries installation folder are already registered in your local computer  system path (*).\nEven though, I've had problems to use some libraries (some worked  in Jupyter Notebook but not in Spyder). I tried the alternatives others proposed to migrate libraries  but it did not worked (maybe I did not\nSo I used brutal force solution.. Not elegant at all, but it worked:\n\nremove the OLD python version folders from the system path  or even remove the folder itself for good..\nFolders:  C:\\Users\\USERNAME\\AppData\\Roaming\\Python\\Python37\nC:\\Users\\USERNAME\\AppData\\Local\\Programs\\Python\\Python37\n\nReinstall the packages you need, preferably via Anaconda prompt.\npython -mpip install library_name\nOR\npip install --user --force-reinstall package_name\nOR\npip install --user --force-reinstall package_name == specify_package_version\n\n\nThe libraries will be installed  at  c:\\users\\USERNAME\\anaconda3\\lib\\site-packages and recognized by your new python version.\n(*) to add the folder to the PATH:  System properties --> environment variables --> click \"Path\"--> edit --> add folder name)","Q_Score":26,"Tags":"python,package,updates,python-module","A_Id":63197461,"CreationDate":"2018-07-12T14:49:00.000","Title":"How to move all modules to new version of Python (from 3.6 to 3.7)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Pretty self-explanatory, trying to do a small web scraper from a google search, but when trying to import, using \"from google import search\" I get the error:\n\nModuleNotFoundError: No module named 'google'. \n\nWhen trying to install google again from the command prompt using \"pip install google\" I get the error: \nRequirement already satisfied: google in c:\\users\\dsimard\\python\\lib\\site-packages (2.0.1)\nRequirement already satisfied: beautifulsoup4 in c:\\users\\dsimard\\python\\lib\\site-packages (from google) (4.6.0)\nI am writing this program in eclipse.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":432,"Q_Id":51331133,"Users Score":0,"Answer":"Try from googlesearch import search","Q_Score":0,"Tags":"python,eclipse","A_Id":51573332,"CreationDate":"2018-07-13T18:40:00.000","Title":"getting error \"modulenotfounderror: No module named 'google'\" but when trying to install through command prompt it says requirement already satisfied","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"So I have this website that I made in web2py and launched using python anywhere. I am using godaddy to host the domain. \nWhen I go to the website though it is not https and is not trusted. So, I bought the trusted site trustmark from godaddy and they are telling me to add a line of javascript into the code of the website to make it trusted. \nBut, I can't figure out where to put this line of code. What file do I put this code in in web2py to make the entire site https?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":54,"Q_Id":51341005,"Users Score":1,"Answer":"Add the specified <script> tag near the bottom of the \/views\/layout.html file of the web2py app, which will result in it being included in every page that extends that layout (if you serve some pages with a different layout or without extending a layout, then you'll need to separately include the code in those views as well).","Q_Score":0,"Tags":"https,web2py,pythonanywhere,godaddy-api,trusted-sites","A_Id":51341232,"CreationDate":"2018-07-14T15:50:00.000","Title":"How to make a web2py site a trusted site","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created a single page app before with Vue and Vuex for state management and am looking into multi page apps with the django backend framework. I am curious to know if there would be any pros to including vuex state management or would the backend take care of state management in this case?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":900,"Q_Id":51341349,"Users Score":1,"Answer":"Vuex still has use cases, even if you are navigating (and thus clearing the store) between pages.\n\nYou can create and restore a store from localStorage, allowing you to keep a local state between pages. Depending on how much data you try to store in the store this may be bad for performance.\nWhen communicating between components, you usually do this with the prefered method of using props and events. However, when two components do not have a direct relation with each other, passing data through several components is usually a burden. You can either use a vuex store to manage shared data, or use a bus to make that easier.\n\nThat said, you probably only want to add a store when you feel the need to have one. Adding a store is usually trivial.","Q_Score":0,"Tags":"python,django,vue.js,vuex","A_Id":51342050,"CreationDate":"2018-07-14T16:33:00.000","Title":"Would vuex state management be useful in implementing a multi page app with django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Actually I have 2 questions. I added google, facebook and twitter sign in to my android app. I use firebase sign in for register and login. After that I will use my own python server. Now, I want to add auto sign in. Namely, after first login, it won't show login page again and it will open other pages automatically. I searched but i didn't find a sample for this structure. How can I do auto sign in with facebook, google, twitter in my android app. And how my server know this login is success and it will give user's data to clients in securely.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":460,"Q_Id":51347328,"Users Score":0,"Answer":"You need to do a web-service call from Android side just after login from firebase, stating in your server that this user has logged in to your app. You can store the access token provided by firebase or you can generate yours on web service call and thereby authenticate user with that token for user specific pages.","Q_Score":1,"Tags":"android,firebase-authentication,facebook-login,google-signin,python-server-pages","A_Id":51347386,"CreationDate":"2018-07-15T10:05:00.000","Title":"Auto sign in with Google, Facebook and Twitter in Android App","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is there a way to completely disable cookies from the Tornado server?  I'm not using them for my public-facing site and I don't want to have the annoying pop-up to get European compliance.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":101,"Q_Id":51365906,"Users Score":0,"Answer":"The only time Tornado sets cookies on its own is if you use the xsrf_cookies application setting. If you turn that off and there are no other calls to set_cookie or set_secure_cookie in your application, no cookies will be set. \nXSRF is a serious security issue and you should carefully consider whether you need an alternative solution if you don't use xsrf_cookies. However, if you don't have any other cookies (or equivalent forms of authentication), you're probably OK.","Q_Score":0,"Tags":"python,cookies,tornado","A_Id":51372029,"CreationDate":"2018-07-16T16:01:00.000","Title":"Turn off cookies in Tornado","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"What's the most elegant way to fetch data from an external API if I want to be faithful to the Single Responsibility Principle? Where\/when exactly should it be made?\nAssuming I've got a POST \/foo endpoint which after being called should somehow trigger a call to the external API and fetch\/save some data from it in my local DB.\nShould I add the call in the view? Or the Model?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":230,"Q_Id":51366456,"Users Score":0,"Answer":"I usually add any external API calls into dedicated services.py module (same level as your models.py that you're planning to save results into or common app if any of the existing are not logically related)\nInside that module you can use class called smth like MyExtarnalService and add all needed methods for fetching, posting, removing etc. just like you would do with drf api view.\nAlso remember to handle exceptions properly (timeouts, connection errors, error response codes) by defining custom error exception classes.","Q_Score":0,"Tags":"python,django,django-rest-framework","A_Id":51407850,"CreationDate":"2018-07-16T16:38:00.000","Title":"fetch data from 3rd party API - Single Responsibility Principle in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am developing an application (Python 3.x) in which I need to collect the first 13,000 results of a CSE query using one search keyword (from result index 1 to 13,000). For a free version of CSE JSON API (I have tried it), I can only get the first 10 results per query or 100 results per day (by repeating the same query while incrementing the index) otherwise it gives an error (HttpError 400.....returned Invalid Value) when the result index exceeds 100. Is there any option (paid\/free) that I can deploy to achieve the objective?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":116,"Q_Id":51369427,"Users Score":0,"Answer":"Custom Search JSON API is limited to a max depth of 100 results per query, so you'll need to find a different API or devise some solution to modify the query to divide up the result set into smaller parts","Q_Score":0,"Tags":"python-3.x,google-search,google-custom-search,google-search-api","A_Id":51387763,"CreationDate":"2018-07-16T20:10:00.000","Title":"Extracting the first 13,000 results of a search query with Custom Search Engine JSON API","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm Junior Django Dev. Got my first project. Doing quite well but senior dev that teaches me went on vacations....\nI have a Task in my company to create a function that will remind all people in specyfic Group, 5 days before event by sending mail.\nThere is a TournamentModel that contains a tournament_start_date for instance '10.08.2018'.\nPlayer can join tournament, when he does he joins django group \"Registered\".\nI have to create a function (job?) that will check tournament_start_date and if tournament begins in 5 days, this function will send emails to all people in \"Registered\" Group... automatically.\nHow can I do this? What should I use? How to run it and it will automatically check? I'm learning python\/django for few months... but I meet jobs fot the first time ;\/\nI will appreciate any help.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":2515,"Q_Id":51379567,"Users Score":1,"Answer":"You can set this  mail send function as cron job\u3002You can schedule it by crontab or Celery if Your team has used it.","Q_Score":2,"Tags":"python,django,task,jobs","A_Id":51380304,"CreationDate":"2018-07-17T10:52:00.000","Title":"Django - how to send mail 5 days before event?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"What I understood in Django models field's attributes is  \n\nauto_now - updates the value of field to current time and date every time the Model.save() is called.\nauto_now_add - updates the value with the time and date of creation of record.\n\nMy question is what if a filed in model contains both the auto_now and auto_now_add set to True? What happens in that case?","AnswerCount":5,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":32637,"Q_Id":51389042,"Users Score":0,"Answer":"If a filed in a model contains both the auto_now and auto_now_add set to True will result in an error like this:\nERRORS:\nappname.Model.field_name: (fields.Efield_number) The options auto_now, auto_now_add, and default are mutually exclusive. Only one of these options may be present.","Q_Score":62,"Tags":"python,django,django-models,django-forms,django-templates","A_Id":69910393,"CreationDate":"2018-07-17T19:38:00.000","Title":"Difference between auto_now and auto_now_add","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"What I understood in Django models field's attributes is  \n\nauto_now - updates the value of field to current time and date every time the Model.save() is called.\nauto_now_add - updates the value with the time and date of creation of record.\n\nMy question is what if a filed in model contains both the auto_now and auto_now_add set to True? What happens in that case?","AnswerCount":5,"Available Count":3,"Score":0.1194272985,"is_accepted":false,"ViewCount":32637,"Q_Id":51389042,"Users Score":3,"Answer":"As Official Django documentation says -\nauto_now, auto_now_add and default are mutually exclusive and will result in an error if used together","Q_Score":62,"Tags":"python,django,django-models,django-forms,django-templates","A_Id":64321206,"CreationDate":"2018-07-17T19:38:00.000","Title":"Difference between auto_now and auto_now_add","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"What I understood in Django models field's attributes is  \n\nauto_now - updates the value of field to current time and date every time the Model.save() is called.\nauto_now_add - updates the value with the time and date of creation of record.\n\nMy question is what if a filed in model contains both the auto_now and auto_now_add set to True? What happens in that case?","AnswerCount":5,"Available Count":3,"Score":1.0,"is_accepted":false,"ViewCount":32637,"Q_Id":51389042,"Users Score":8,"Answer":"These fields are built into Django for expressly this purpose \u2014 auto_now fields are updated to the current timestamp every time an object is saved and are therefore perfect for tracking when an object was last modified, while an auto_now_add field is saved as the current timestamp when a row is first added to the database and is therefore perfect for tracking when it was created.","Q_Score":62,"Tags":"python,django,django-models,django-forms,django-templates","A_Id":66179103,"CreationDate":"2018-07-17T19:38:00.000","Title":"Difference between auto_now and auto_now_add","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a django file server. The server works perfectly on my laptop & localhost (with external hard drive) but when I transferred it to my Raspberry Pi running Raspbian, it starts acting up.\nI did a lot of googling and tried every possible solution but it does not work. \nHere is my problem:\nI have connected an external hard drive to my raspberry pi. I believe it has write permissions because I can easily write to it with mkdir. I have also set this directory which is \/media\/pi\/SAMSUNG\/media as my MEDIA_ROOT. \nNow I have set up Apache2, WSGI and Django, everything works, I have set up all the permissions and everything, but still when django tries to access the hard drive, whether it be to read or write, I get an error [Errno 13] Permission denied: '\/media\/pi\/SAMSUNG'. \nI have fixed this in the past with chown -R 777 but it does not work this time. \nUnfortunetly, I have no idea what I am doing when it comes to servers and file permissions, so I have no idea what code to attach. Can some please help me?\nI will attach all the necessary code on request.\nThank you","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":165,"Q_Id":51410594,"Users Score":0,"Answer":"On raspbian you have to be careful when using external drives. Have you edited the file \/etc\/fstab? This is necessary to mount the drive also correctly after restarts and when the file is temporarily disconnected and then connected again.\nIf you did this correctly, then the drive will have the permissions you gave it when mounting and Django should be able to access it\/write to it.\nBR","Q_Score":0,"Tags":"python,django,apache2,file-permissions","A_Id":51410717,"CreationDate":"2018-07-18T20:36:00.000","Title":"Permission denied when django writes to external device","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I installed anaconda3 on centos and used the flask to run the web project. But an error occurred in anaconda3 library. Only anaconda3 was reinstalled after delete. I set the path to the .bashrc file. However, it is not possible to run the flask web project.\nDo I need additional settings for my centos server?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":45,"Q_Id":51415865,"Users Score":1,"Answer":"Since anaconda already ships with flask, you do not need any additional settings. However, if your project has other requirements like flask extensions e.g. flask-restless etc. then you would need to manually install them using pip.\nIf your project has a requirements.txt file, you can install the requirements using  pip install -r requirements.txt. If it does not have any, then you might have to install a library called pipreqs from the python package index. Then use pipreqs to generate the requirements.txt file and install the dependancies.","Q_Score":0,"Tags":"python,flask,centos,anaconda","A_Id":51419472,"CreationDate":"2018-07-19T06:35:00.000","Title":"centos server anaconda re-install and setting","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"any one clear this error because if i include in command line \nopenposedemo.exe --face this error come\nError:\nPrototxt file not found: models\\face\/pose_deploy.prototxt.\nPossible causes:\n        1. Not downloading the OpenPose trained models.\n        2. Not running OpenPose from the same directory where the model folder is located.\n        3. Using paths with spaces.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1010,"Q_Id":51418537,"Users Score":0,"Answer":"If running Windows tryIf running Windows 10 try opening an admin command prompt in your openpose root folder and then paste bin\\OpenPoseDemo.exe.  You have to run it from the root context you cannot cd into the bin folder and then run it from there.\nC:\\openpose\\bin\\openposedemo.exe","Q_Score":0,"Tags":"python-3.x,opencv3.1","A_Id":61537350,"CreationDate":"2018-07-19T09:05:00.000","Title":"Prototxt file not found:","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is there any library in python that can I easily compare fingerprints? \nI want to build a student attendance system using fingerprint, my frontend will be ReactJS and Django as backend. Like, you need to save the fingerprints of every student in the database and you will retrieve it for comparing.\nI already google but there are no specific result for my question.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1431,"Q_Id":51418915,"Users Score":0,"Answer":"Got it guys, the scanner will just give me output to save in db. I thought I will save figerprint as image in db, and  retrieve the image to compare.","Q_Score":0,"Tags":"python,django,reactjs","A_Id":51423344,"CreationDate":"2018-07-19T09:23:00.000","Title":"Python Library for Comparing Fingerprints","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I got an error while running django server. I installed opencv-python and opencv-contrib-python through pip. Still getting the same error. Any suggestions?\n\nPerforming system checks...\n\nUnhandled exception in thread started by \nTraceback (most recent call last):\n  File \"\/home\/auxouser\/.local\/lib\/python2.7\/site-packages\/django\/utils\/autoreload.py\", line 228, in wrapper fn(*args, **kwargs)\n  File \"\/home\/auxouser\/.local\/lib\/python2.7\/site-packages\/django\/core\/management\/commands\/runserver.py\", line 124, in inner_run\n    self.check(display_num_errors=True)\n  File \"\/home\/auxouser\/.local\/lib\/python2.7\/site-packages\/django\/core\/management\/base.py\", line 359, in check include_deployment_checks=include_deployment_checks,\n  File \"\/home\/auxouser\/.local\/lib\/python2.7\/site-packages\/django\/core\/management\/base.py\", line 346, in _run_checks return checks.run_checks(**kwargs) \n  File \"\/home\/auxouser\/.local\/lib\/python2.7\/site-packages\/django\/core\/checks\/registry.py\", line 81, in run_checks new_errors = check(app_configs=app_configs)\n  File \"\/home\/auxouser\/.local\/lib\/python2.7\/site-packages\/django\/core\/checks\/urls.py\", line 16, in check_url_config return check_resolver(resolver)\n  File \"\/home\/auxouser\/.local\/lib\/python2.7\/site-packages\/django\/core\/checks\/urls.py\", line 26, in check_resolver return check_method()\n  File \"\/home\/auxouser\/.local\/lib\/python2.7\/site-packages\/django\/urls\/resolvers.py\", line 254, in check for pattern in self.url_patterns:\n  File \"\/home\/auxouser\/.local\/lib\/python2.7\/site-packages\/django\/utils\/functional.py\", line 35, in __get__res = instance.__dict__[self.name] = self.func(instance)\n  File \"\/home\/auxouser\/.local\/lib\/python2.7\/site-packages\/django\/urls\/resolvers.py\", line 405, in url_patterns patterns = getattr(self.urlconf_module, \"urlpatterns\", self.urlconf_module)\n  File \"\/home\/auxouser\/.local\/lib\/python2.7\/site-packages\/django\/utils\/functional.py\", line 35, in __get__ res = instance.__dict__[self.name] = self.func(instance)\n  File \"\/home\/auxouser\/.local\/lib\/python2.7\/site-packages\/django\/urls\/resolvers.py\", line 398, in urlconf_module return import_module(self.urlconf_name)\n  File \"\/usr\/lib\/python2.7\/importlib\/__init__.py\", line 37, in import_module\n    __import__(name)\n  File \"\/home\/auxouser\/Auxo\/projects\/training-ds\/Day-9\/Face_Recognition\/Face_Recognition\/urls.py\", line 3, in \n    from MyAPP import views\n  File \"\/home\/auxouser\/Auxo\/projects\/training-ds\/Day-9\/Face_Recognition\/MyAPP\/views.py\", line 12, in \n    recognizer = cv2.face.LBPHFaceRecognizer_create()\nAttributeError: 'module' object has no attribute 'face'","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":347,"Q_Id":51422857,"Users Score":1,"Answer":"You probably have a module named cv.py (or cv2.py in this case) in your project - that means import cv2 is importing your own module, not opencv, and cv2.face will fail.\nDelete your .py file and the .pyc that was generated, and the import should work again.","Q_Score":0,"Tags":"python,django,opencv,pip","A_Id":51423083,"CreationDate":"2018-07-19T12:35:00.000","Title":"AttributeError: 'module' object has no attribute 'face' even after installed opencv-contrib-python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I recently moved some code I've been using successfully into a flask server. It has worked seamlessly until now off the server. \nHowever, in the same directory, when trying to load a stored object using pickle, I get an ImportError. This happens in a function which runs when @app.before_first_request is called.\nHow could this change cause this? Any insights would be appreciated.\nThanks!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":871,"Q_Id":51432379,"Users Score":0,"Answer":"It seems that Flask change the paths that are searched for imports, adding sys.path.append('.\/') to the beginning of my app's file fixed the problem.","Q_Score":0,"Tags":"python,flask,pickle,importerror","A_Id":51443329,"CreationDate":"2018-07-19T22:07:00.000","Title":"Using Pickle in Flask","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have deployed a webapplication Python Django Rest Framework Front end is Vue js and Database is Mysql.\nHosted the website on digital ocean i am using CPU Optimized Droplets with the below configuration 8 GB 4 vCPUs i facing performance issue the site is very slow though the hosting is CPU optimized with 8gb of ram.\nWhen i checked the error log i am able to find [CRITICAL] WORKER TIMEOUT (pid:9116) i increased the timeout time of the gunicorn still i am facing the same issue.\n1)I want to increase the performance \n2)I want to fix the timeout issue i have increased the value in gunicorn as nginx the maximum value is 75s i have not done any addition to it. what will be th best solution.\nKindly help me is there any alternative ways to test the performance of the site.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1064,"Q_Id":51436451,"Users Score":0,"Answer":"I think you need optimization\nTips on optimizing your django rest on production server .\n\nCheck your queries. Best way to check this is using the django debug toolbar, it will show how many queries you produce and if you think there is a lot, then optimize your queries. Ex. use prefetch_related or  select_related to join the tables or else it will query one by one.\nIndex your tables, try to index the columns you're always using on querying. Just be careful on indexing, just index the columns you really wanted because the downside will be slower on update, delete and add.\nCheck your database health, if you perform delete or update frequently those data actually stored somewhere and it is still part of your indexes, it called Dead Rows, you can remove this by perform some commands like vacuum if your are using postgres.\nScale up your server, this actually depends on the request\/traffic of your server, check the RAM or CPU spikes for you to determine the needed units. As experience, I have atleast 10m row of data on some of my tables, which in some scenario I cross refer it to a 30k data, on 2gb RAM and 1gb CPU working fine in few simultaneous request.","Q_Score":0,"Tags":"python,django,nginx,webserver,gunicorn","A_Id":51439974,"CreationDate":"2018-07-20T06:36:00.000","Title":"Gunicorn Timeout Server Slow issues","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to generate html email, that would show data based on dropdown menu selection within email. I have been looking around and could not find anything suitable for this use case.\nCurrently my procedure is that I use Python to generate all required data and than render html template with Jinja2 package.\nWhat I would like to have is first part of email to be static and than under that section have a dropdown menu, which would render rest of email based on selection. I wonder if that is even possible (on side note, I can not use JS, as it is blocked for mails that are generated)?\nThank you and best regards,\nBostjan","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1050,"Q_Id":51441100,"Users Score":2,"Answer":"You will have to work with css's :active property to work around js here.\nYour problem will be the broad variety of email programms, outlook and such will fail to process this correctly.","Q_Score":2,"Tags":"python,html,dynamic,jinja2,dropdown","A_Id":51441195,"CreationDate":"2018-07-20T11:03:00.000","Title":"Dynamic html email with dropdown","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"When creating new Python processes within PySpark driver (e.g. with JobLib or other multi-processing library), do those processes share the Spark driver memory, or are they allocated memory outside of that PySpark driver JVM?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":354,"Q_Id":51457539,"Users Score":5,"Answer":"Python driver memory is not accounted in spark.driver.memory (sames as spark.executor.memory in case of workers). spark.*.memory settings are used only for on-heap Java memory allocation.\nAll other forms of memory allocation (off-heap, native memory like in case of Python and such) are covered by spark.driver.memoryOverhead and equivalent settings.","Q_Score":2,"Tags":"python,apache-spark,pyspark","A_Id":51457824,"CreationDate":"2018-07-21T15:32:00.000","Title":"Memory Allocation of Python Sub-Processes Within Pyspark Driver","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Does Beautiful Soup work with Iron Python?\nIf so with which version of Iron Python? How easy is it to distribute a windows desktop app on .net 2.0 using Iron Python (mostly C# calling some python code for parsing html)?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":195,"Q_Id":51463472,"Users Score":2,"Answer":"Most purely Python modules work with Iron Python. If it contains C, it will not work, most likely. From a quick look at the source code, you can find that BeautifulSoup4 is purely Python. Therefore, it is most likely compatible with IronPython. Hope I could help.","Q_Score":0,"Tags":".net,beautifulsoup,ironpython","A_Id":51470861,"CreationDate":"2018-07-22T08:52:00.000","Title":"Does BeautifulSoup work on IronPython?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We have a Linux server with Jupyterhub installed and can be accessed by users over browser, similarly we are able to access Rstudio. \nIs it possible to install Spyder on the Linux server and provide access via web browser. Multiple users will be accessing it simultaneously.  We are not looking for remote desktop or SSH solution. \nThanks","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1496,"Q_Id":51465212,"Users Score":2,"Answer":"(Spyder maintainer here) Spyder can't work inside a web browser because it's a pure desktop application, sorry.","Q_Score":0,"Tags":"python,anaconda,spyder","A_Id":51467329,"CreationDate":"2018-07-22T12:38:00.000","Title":"Access Python Spyder in Browser like Rstudio or Jupyter notebook (NOT SSH)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Apparently there is not an easy way to remove a model from cloud-ml, not with the UI or using the python API. Does anybody know a fast way to remove a model with all its versions from cloud-ml ?.","AnswerCount":4,"Available Count":1,"Score":0.049958375,"is_accepted":false,"ViewCount":774,"Q_Id":51488117,"Users Score":1,"Answer":"The ways suggested above are the correct ways of deleting a model, i.e. versions first (non-default, then default) and then the model itself. We are aware that this  might be cumbersome and are working towards making this interface easier for our users. One way could be to have something that basically recursively deletes the versions and models. Are there other ways this can be done that will be more suitable?","Q_Score":0,"Tags":"python,google-cloud-platform,google-cloud-ml","A_Id":51507745,"CreationDate":"2018-07-23T22:42:00.000","Title":"remove a model and all its versions from cloud-ml","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to handle the event when the shutdown process is started(for example with long press the robot's chest button or when the battery is critically low). The problem is that I didn't find a way to handle the shutdown\/poweroff event. Do you have any idea how this can be done in some convenient way?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":134,"Q_Id":51498056,"Users Score":2,"Answer":"Unfortunately this won't be possible as when you trigger a shutdown naoqi will exit as well and destroy your service. \nIf you are coding in c++ you could use a destructor, but there is no proper equivalent for python... \nAn alternative would be to execute some code when your script exits whatever the reason. For this you can start your script as a service and wait for \"the end\" using qiApplication.run(). This method will simply block until naoqi asks your service to exit. \nNote: in case of shutdown, all services are being killed, so you cannot run any command from the robot API (as they are probably not available anymore!)","Q_Score":0,"Tags":"python,nao-robot,pepper,choregraphe","A_Id":51566036,"CreationDate":"2018-07-24T11:59:00.000","Title":"How can I handle Pepper robot shutdown event?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm new to django and using the anaconda cloud environment. Its been working well for 3 months plus but as of 7-24-2018 it is just stop to launch the navigator or open through cmd. I can't manage environments or install packages. Using the anaconda prompt also gives me the same error upon launching. It started when I wanted to install django-Oscar, but not having its dependencies I was forced to install the packages manually which in turn needed cytoolz that needs Microsoft Visual C++ build tools which I got to install as well but the error persists. Please help me!\nCopy\/Paste of CMD Traceback:\n\nC:\\Users\\kaukau\\Desktop>conda --version conda 4.5.4\nC:\\Users\\kaukau\\Desktop>anaconda-navigator Traceback (most recent call\n  last):   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\qtpy__init__.py\", line\n  169, in \n      from PySide import version as PYSIDE_VERSION  # analysis:ignore ModuleNotFoundError: No module named 'PySide'\nDuring handling of the above exception, another exception occurred:\nTraceback (most recent call last):   File\n  \"C:\\Users\\kaukau\\Anaconda3\\Scripts\\anaconda-navigator-script.py\", line\n  6, in \n      from anaconda_navigator.app.main import main   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\anaconda_navigator\\app\\main.py\",\n  line 22, in \n      from anaconda_navigator.utils.conda import is_conda_available   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\anaconda_navigator\\utils__init__.py\",\n  line 15, in \n      from qtpy.QtGui import QIcon   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\qtpy__init__.py\", line\n  175, in \n      raise PythonQtError('No Qt bindings could be found') qtpy.PythonQtError: No Qt bindings could be found\nC:\\Users\\kaukau\\Desktop>conda install qt --force Traceback (most\n  recent call last):   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\common\\configuration.py\",\n  line 42, in \n      from cytoolz.dicttoolz import merge   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\cytoolz__init__.py\",\n  line 1, in \n      from .itertoolz import * ModuleNotFoundError: No module named 'cytoolz.itertoolz'\nDuring handling of the above exception, another exception occurred:\nTraceback (most recent call last):   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\exceptions.py\",\n  line 819, in call\n      return func(*args, **kwargs)   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\cli\\main.py\", line\n  73, in _main\n      from ..base.context import context   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\base\\context.py\",\n  line 23, in \n      from ..common.configuration import (Configuration, LoadError, MapParameter, PrimitiveParameter,   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\common\\configuration.py\",\n  line 47, in \n      from .._vendor.toolz.functoolz import excepts   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda_vendor\\toolz\\functoolz.py\",\n  line 501\n      f.name for f in reversed((self.first,) + self.funcs),\n      ^ SyntaxError: Generator expression must be parenthesized\nDuring handling of the above exception, another exception occurred:\nTraceback (most recent call last):   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\common\\configuration.py\",\n  line 42, in \n      from cytoolz.dicttoolz import merge   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\cytoolz__init__.py\",\n  line 1, in \n      from .itertoolz import * ModuleNotFoundError: No module named 'cytoolz.itertoolz'\nDuring handling of the above exception, another exception occurred:\nTraceback (most recent call last):   File\n  \"C:\\Users\\kaukau\\Anaconda3\\Scripts\\conda-script.py\", line 10, in\n  \n      sys.exit(main())   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\cli\\main.py\", line\n  113, in main\n      return conda_exception_handler(_main, *args)   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\exceptions.py\",\n  line 1112, in conda_exception_handler\n      return_value = exception_handler(func, *args, **kwargs)   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\exceptions.py\",\n  line 822, in call\n      return self.handle_exception(exc_val, exc_tb)   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\exceptions.py\",\n  line 864, in handle_exception\n      return self.handle_unexpected_exception(exc_val, exc_tb)   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\exceptions.py\",\n  line 876, in handle_unexpected_exception\n      self.print_unexpected_error_report(error_report)   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\exceptions.py\",\n  line 932, in print_unexpected_error_report\n      from .base.context import context   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\base\\context.py\",\n  line 23, in \n      from ..common.configuration import (Configuration, LoadError, MapParameter, PrimitiveParameter,   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\common\\configuration.py\",\n  line 47, in \n      from .._vendor.toolz.functoolz import excepts   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda_vendor\\toolz\\functoolz.py\",\n  line 501\n      f.name for f in reversed((self.first,) + self.funcs),\n      ^ SyntaxError: Generator expression must be parenthesized Traceback (most recent call last):   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\common\\configuration.py\",\n  line 42, in \n      from cytoolz.dicttoolz import merge   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\cytoolz__init__.py\",\n  line 1, in \n      from .itertoolz import * ModuleNotFoundError: No module named 'cytoolz.itertoolz'\nDuring handling of the above exception, another exception occurred:\nTraceback (most recent call last):   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\cli\\main.py\", line\n  97, in main\n      from ..activate import main as activator_main   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\activate.py\", line\n  11, in \n      from .base.context import ROOT_ENV_NAME, context, locate_prefix_by_name   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\base\\context.py\",\n  line 23, in \n      from ..common.configuration import (Configuration, LoadError, MapParameter, PrimitiveParameter,   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\common\\configuration.py\",\n  line 47, in \n      from .._vendor.toolz.functoolz import excepts   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda_vendor\\toolz\\functoolz.py\",\n  line 501\n      f.name for f in reversed((self.first,) + self.funcs),\n      ^ SyntaxError: Generator expression must be parenthesized\nDuring handling of the above exception, another exception occurred:\nTraceback (most recent call last):   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\common\\configuration.py\",\n  line 42, in \n      from cytoolz.dicttoolz import merge   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\cytoolz__init__.py\",\n  line 1, in \n      from .itertoolz import * ModuleNotFoundError: No module named 'cytoolz.itertoolz'\nDuring handling of the above exception, another exception occurred:\nTraceback (most recent call last):   File\n  \"C:\\Users\\kaukau\\Anaconda3\\Scripts\\conda-script.py\", line 10, in\n  \n      sys.exit(main())   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\cli\\main.py\", line\n  110, in main\n      return ExceptionHandler().handle_exception(exc_val, exc_tb)   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\exceptions.py\",\n  line 864, in handle_exception\n      return self.handle_unexpected_exception(exc_val, exc_tb)   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\exceptions.py\",\n  line 876, in handle_unexpected_exception\n      self.print_unexpected_error_report(error_report)   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\exceptions.py\",\n  line 932, in print_unexpected_error_report\n      from .base.context import context   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\base\\context.py\",\n  line 23, in \n      from ..common.configuration import (Configuration, LoadError, MapParameter, PrimitiveParameter,   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\common\\configuration.py\",\n  line 47, in \n      from .._vendor.toolz.functoolz import excepts   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda_vendor\\toolz\\functoolz.py\",\n  line 501\n      f.name for f in reversed((self.first,) + self.funcs),\n      ^ SyntaxError: Generator expression must be parenthesized\n\n\nI've just found out that I cant even use any conda commands except the : >conda --version< command only.\nPlease help me resolve this issue without uninstalling then reinstalling anaconda completely","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1755,"Q_Id":51519102,"Users Score":0,"Answer":"It usually happen when you directly download and insall anaconda normally form its website.\nUpdating anaconda solved this issue for me in Manjaro and will surely work on Windows as well.\nuse conda update anaconda-navigator command to Update Anaconda.\nIf it doesn't starts, restart your pc and try to open it again.","Q_Score":1,"Tags":"python-3.x,windows-10,anaconda","A_Id":64991133,"CreationDate":"2018-07-25T12:38:00.000","Title":"anaconda navigator will no longer start even through cmd, won't install or update or manage environments","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm new to django and using the anaconda cloud environment. Its been working well for 3 months plus but as of 7-24-2018 it is just stop to launch the navigator or open through cmd. I can't manage environments or install packages. Using the anaconda prompt also gives me the same error upon launching. It started when I wanted to install django-Oscar, but not having its dependencies I was forced to install the packages manually which in turn needed cytoolz that needs Microsoft Visual C++ build tools which I got to install as well but the error persists. Please help me!\nCopy\/Paste of CMD Traceback:\n\nC:\\Users\\kaukau\\Desktop>conda --version conda 4.5.4\nC:\\Users\\kaukau\\Desktop>anaconda-navigator Traceback (most recent call\n  last):   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\qtpy__init__.py\", line\n  169, in \n      from PySide import version as PYSIDE_VERSION  # analysis:ignore ModuleNotFoundError: No module named 'PySide'\nDuring handling of the above exception, another exception occurred:\nTraceback (most recent call last):   File\n  \"C:\\Users\\kaukau\\Anaconda3\\Scripts\\anaconda-navigator-script.py\", line\n  6, in \n      from anaconda_navigator.app.main import main   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\anaconda_navigator\\app\\main.py\",\n  line 22, in \n      from anaconda_navigator.utils.conda import is_conda_available   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\anaconda_navigator\\utils__init__.py\",\n  line 15, in \n      from qtpy.QtGui import QIcon   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\qtpy__init__.py\", line\n  175, in \n      raise PythonQtError('No Qt bindings could be found') qtpy.PythonQtError: No Qt bindings could be found\nC:\\Users\\kaukau\\Desktop>conda install qt --force Traceback (most\n  recent call last):   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\common\\configuration.py\",\n  line 42, in \n      from cytoolz.dicttoolz import merge   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\cytoolz__init__.py\",\n  line 1, in \n      from .itertoolz import * ModuleNotFoundError: No module named 'cytoolz.itertoolz'\nDuring handling of the above exception, another exception occurred:\nTraceback (most recent call last):   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\exceptions.py\",\n  line 819, in call\n      return func(*args, **kwargs)   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\cli\\main.py\", line\n  73, in _main\n      from ..base.context import context   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\base\\context.py\",\n  line 23, in \n      from ..common.configuration import (Configuration, LoadError, MapParameter, PrimitiveParameter,   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\common\\configuration.py\",\n  line 47, in \n      from .._vendor.toolz.functoolz import excepts   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda_vendor\\toolz\\functoolz.py\",\n  line 501\n      f.name for f in reversed((self.first,) + self.funcs),\n      ^ SyntaxError: Generator expression must be parenthesized\nDuring handling of the above exception, another exception occurred:\nTraceback (most recent call last):   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\common\\configuration.py\",\n  line 42, in \n      from cytoolz.dicttoolz import merge   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\cytoolz__init__.py\",\n  line 1, in \n      from .itertoolz import * ModuleNotFoundError: No module named 'cytoolz.itertoolz'\nDuring handling of the above exception, another exception occurred:\nTraceback (most recent call last):   File\n  \"C:\\Users\\kaukau\\Anaconda3\\Scripts\\conda-script.py\", line 10, in\n  \n      sys.exit(main())   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\cli\\main.py\", line\n  113, in main\n      return conda_exception_handler(_main, *args)   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\exceptions.py\",\n  line 1112, in conda_exception_handler\n      return_value = exception_handler(func, *args, **kwargs)   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\exceptions.py\",\n  line 822, in call\n      return self.handle_exception(exc_val, exc_tb)   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\exceptions.py\",\n  line 864, in handle_exception\n      return self.handle_unexpected_exception(exc_val, exc_tb)   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\exceptions.py\",\n  line 876, in handle_unexpected_exception\n      self.print_unexpected_error_report(error_report)   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\exceptions.py\",\n  line 932, in print_unexpected_error_report\n      from .base.context import context   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\base\\context.py\",\n  line 23, in \n      from ..common.configuration import (Configuration, LoadError, MapParameter, PrimitiveParameter,   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\common\\configuration.py\",\n  line 47, in \n      from .._vendor.toolz.functoolz import excepts   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda_vendor\\toolz\\functoolz.py\",\n  line 501\n      f.name for f in reversed((self.first,) + self.funcs),\n      ^ SyntaxError: Generator expression must be parenthesized Traceback (most recent call last):   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\common\\configuration.py\",\n  line 42, in \n      from cytoolz.dicttoolz import merge   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\cytoolz__init__.py\",\n  line 1, in \n      from .itertoolz import * ModuleNotFoundError: No module named 'cytoolz.itertoolz'\nDuring handling of the above exception, another exception occurred:\nTraceback (most recent call last):   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\cli\\main.py\", line\n  97, in main\n      from ..activate import main as activator_main   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\activate.py\", line\n  11, in \n      from .base.context import ROOT_ENV_NAME, context, locate_prefix_by_name   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\base\\context.py\",\n  line 23, in \n      from ..common.configuration import (Configuration, LoadError, MapParameter, PrimitiveParameter,   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\common\\configuration.py\",\n  line 47, in \n      from .._vendor.toolz.functoolz import excepts   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda_vendor\\toolz\\functoolz.py\",\n  line 501\n      f.name for f in reversed((self.first,) + self.funcs),\n      ^ SyntaxError: Generator expression must be parenthesized\nDuring handling of the above exception, another exception occurred:\nTraceback (most recent call last):   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\common\\configuration.py\",\n  line 42, in \n      from cytoolz.dicttoolz import merge   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\cytoolz__init__.py\",\n  line 1, in \n      from .itertoolz import * ModuleNotFoundError: No module named 'cytoolz.itertoolz'\nDuring handling of the above exception, another exception occurred:\nTraceback (most recent call last):   File\n  \"C:\\Users\\kaukau\\Anaconda3\\Scripts\\conda-script.py\", line 10, in\n  \n      sys.exit(main())   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\cli\\main.py\", line\n  110, in main\n      return ExceptionHandler().handle_exception(exc_val, exc_tb)   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\exceptions.py\",\n  line 864, in handle_exception\n      return self.handle_unexpected_exception(exc_val, exc_tb)   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\exceptions.py\",\n  line 876, in handle_unexpected_exception\n      self.print_unexpected_error_report(error_report)   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\exceptions.py\",\n  line 932, in print_unexpected_error_report\n      from .base.context import context   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\base\\context.py\",\n  line 23, in \n      from ..common.configuration import (Configuration, LoadError, MapParameter, PrimitiveParameter,   File\n  \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda\\common\\configuration.py\",\n  line 47, in \n      from .._vendor.toolz.functoolz import excepts   File \"C:\\Users\\kaukau\\Anaconda3\\lib\\site-packages\\conda_vendor\\toolz\\functoolz.py\",\n  line 501\n      f.name for f in reversed((self.first,) + self.funcs),\n      ^ SyntaxError: Generator expression must be parenthesized\n\n\nI've just found out that I cant even use any conda commands except the : >conda --version< command only.\nPlease help me resolve this issue without uninstalling then reinstalling anaconda completely","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":1755,"Q_Id":51519102,"Users Score":0,"Answer":"Sorry to waste your time, I solved it by reinstalling anaconda completely and every project started working again....thanks to those who read it, the effort is appreciated.","Q_Score":1,"Tags":"python-3.x,windows-10,anaconda","A_Id":51995155,"CreationDate":"2018-07-25T12:38:00.000","Title":"anaconda navigator will no longer start even through cmd, won't install or update or manage environments","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am writing a server with multiple gunicorn workers and want to let them all have access to a specific variable. I'm using Redis to do this(it's in RAM, so it's fast, right?) but every GET or SET request adds another client.  I'm performing maybe ~150 requests per second, so it quickly reaches the 25 connection limit that Heroku has. To access the database, I'm using db = redis.from_url(os.environ.get(\"REDIS_URL\")) and then db.set() and db.get().  Is there a way to lower that number? For instance, by using the same connection over and over again for each worker?  But how would I do that? The 3 gunicorn workers I have are performing around 50 queries each per second.\nIf using redis is a bad idea(which it probably is), it would be great if you could suggest alternatives, but also please include a way to fix my current problem as most of my code is based off of it and I don't have enough time to rewrite the whole thing yet.\nNote: The three pieces of code are the only times redis and db are called.  I didn't do any configuration or anything.  Maybe that info will help.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":133,"Q_Id":51519333,"Users Score":0,"Answer":"Most likely, your script creates a new connection for each request.\nBut each worker should create it once and use forever.\nWhich framework are you using?\nIt should have some documentation about how to configure Redis for your webapp.\nP.S. Redis is a good choice to handle that :)","Q_Score":1,"Tags":"python,heroku,redis,gunicorn","A_Id":51519644,"CreationDate":"2018-07-25T12:50:00.000","Title":"Python Redis on Heroku reached max clients","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am basically trying to start an HTTP server which will respond with content from a website which I can crawl using Scrapy. In order to start crawling the website I need to login to it and to do so I need to access a DB with credentials and such. The main issue here is that I need everything to be fully asynchronous and so far I am struggling to find a combination that will make everything work properly without many sloppy implementations.\nI already got Klein + Scrapy working but when I get to implementing DB accesses I get all messed up in my head. Is there any way to make PyMongo asynchronous with twisted or something (yes, I have seen TxMongo but the documentation is quite bad and I would like to avoid it. I have also found an implementation with adbapi but I would like something more similar to PyMongo).\nTrying to think things through the other way around I'm sure aiohttp has many more options to implement async db accesses and stuff but then I find myself at an impasse with Scrapy integration.\nI have seen things like scrapa, scrapyd and ScrapyRT but those don't really work for me. Are there any other options?\nFinally, if nothing works, I'll just use aiohttp and instead of Scrapy I'll do the requests to the websito to scrap manually and use beautifulsoup or something like that to get the info I need from the response. Any advice on how to proceed down that road?\nThanks for your attention, I'm quite a noob in this area so I don't know if I'm making complete sense. Regardless, any help will be appreciated :)","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":263,"Q_Id":51525645,"Users Score":0,"Answer":"Is there any way to make pymongo asynchronous with twisted\n\nNo. pymongo is designed as a synchronous library, and there is no way you can make it asynchronous without basically rewriting it (you could use threads or processes, but that is not what you asked, also you can run into issues with thread-safeness of the code).\n\nTrying to think things through the other way around I'm sure aiohttp has many more options to implement async db accesses and stuff\n\nIt doesn't. aiohttp is a http library - it can do http asynchronously and that is all, it has nothing to help you access databases. You'd have to basically rewrite pymongo on top of it.\n\nFinally, if nothing works, I'll just use aiohttp and instead of scrapy I'll do the requests to the websito to scrap manually and use beautifulsoup or something like that to get the info I need from the response.\n\nThat means lots of work for not using scrapy, and it won't help you with the pymongo issue - you still have to rewrite pymongo!\nMy suggestion is - learn txmongo! If you can't and want to rewrite it, use twisted.web to write it instead of aiohttp since then you can continue using scrapy!","Q_Score":0,"Tags":"python,mongodb,asynchronous,server,scrapy","A_Id":51525888,"CreationDate":"2018-07-25T18:37:00.000","Title":"Async HTTP server with scrapy and mongodb in python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm having a hard time figuring out why outputs aren't the same. Notice that the difference is very tiny if you compare both OUT's. What I'm trying to achieve is have the same output in Python to the one in Ruby.\nRuby:\nIN:['034151a3ec46b5670a682b0a63394f863587d1bc97483b1b6c70eb58e7f0aed192'].pack('H*')\nOUT:\\x03AQ\\xA3\\xECF\\xB5g\\nh+\\nc9O\\x865\\x87\\xD1\\xBC\\x97H;\\elp\\xEBX\\xE7\\xF0\\xAE\\xD1\\x92\nPython:\nIN:unhexlify('034151a3ec46b5670a682b0a63394f863587d1bc97483b1b6c70eb58e7f0aed192') OUT:\\x03AQ\\xa3\\xecF\\xb5g\\nh+\\nc9O\\x865\\x87\\xd1\\xbc\\x97H;\\x1blp\\xebX\\xe7\\xf0\\xae\\xd1\\x92","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":478,"Q_Id":51547637,"Users Score":6,"Answer":"Both languages have produced the same sequence of bytes; the only difference is in the way they display those bytes to you. Ruby has an \\e string escape sequence for the 1b byte (ASCII ESC, escape), while Python displays that byte as \\x1b.","Q_Score":2,"Tags":"python,ruby,pack,binascii","A_Id":51547687,"CreationDate":"2018-07-26T21:18:00.000","Title":"Ruby pack('H*') equivalent in Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a problem, I have been using a docker environment for my django 2.0 project and pylint was working fine but now it's showing the unable to import module error. I'm aware that the import error question has been asked many times but it was always for a venv setup rather than docker environment setup. \nI'm not sure what triggered the error, but possibly because I deleted my old containers, volumes, images and started from scratch. \nI'm using Python 3 and VSCode on Manjaro Linux. \nThanks in advance if anyone can help.\nTo add \"python.linting.pylintArgs\": [\"--load-plugins\", \"pylint_django\"] in settings results in real errors not being reported too.","AnswerCount":1,"Available Count":1,"Score":-0.1973753202,"is_accepted":false,"ViewCount":1630,"Q_Id":51550260,"Users Score":-1,"Answer":"To try and find an answer for myself and anyone who read this, a possible reason for this is installing pylint via vscode which uses pip. Generally not recommended to do this or sudo pip install in linux. Use your linux package manager to install.","Q_Score":6,"Tags":"python,django,docker,visual-studio-code,pylint","A_Id":51569836,"CreationDate":"2018-07-27T03:16:00.000","Title":"Docker dev environment, pylint unable to import error","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to use two other url tags other then pk and slug in a detail view. I have the following code snippet:\n\nviews.py\n\n    class UseCaseDetailView(DetailView):\n        template_name = \"useCaseExtract\/useCaseDetail.html\"\n        model = UseCaseProfile\n        context_object_name = 'usecaseprofile'\n        '''I am trying to override the get_object method of DetailView to accept url tags project and usecasename instead of pk and slug'''\n        def get_object(self):     \n            obj = get_object_or_404(UseCaseProfile, project=self.kwargs['project'], useCasename=self.kwargs['useCasename'])\n            return obj\n\nurls.py\n...\n\n    path('\/UseCaseDetail\/', UseCaseDetailView.as_view(), name='UseCaseDetail')\n\n...\n\nin my template file, I have the following link:\n\/Trancel\/UseCaseDetail\/Nothing\n\nafter I clicked the link, I got:\nValueError: invalid literal for int() with base 10:  'Trancel'\n\ncan you some please explain to me why I am getting this error?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":72,"Q_Id":51563669,"Users Score":0,"Answer":"Do you have the ability to rename Trance1 to something like TranceOne? So that it doesn't include an integer?\nI think your issue is that 1 when it comes time to parse the URL..( as its expecting a sting, but it gets string w\/ a 1 in it).","Q_Score":0,"Tags":"python,django,django-class-based-views,detailview","A_Id":51563885,"CreationDate":"2018-07-27T18:32:00.000","Title":"Got \"ValueError: invalid literal for int() with base 10: 'Trancel'\" when using two paramenters in detailview in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an odd behavior that I can't seem to track down a cause for.\nI am using the Parallels Desktop Lite app running on High Sierra to create a new MacOS VM that is also running High Sierra for development.\nI have successfully built a Postgres \/ Gunicorn \/ Nginx \/ Supervisor \/ Django stack. I am using Django==1.9.2 for legacy reasons.\nI imported my legacy django website code and it runs fine. Now I start taking snapshots of the VM as I remove unneeded components from the Django site. \nSo say I have 10 apps in INSTALLED_APPS. I have successfully commented out \/ removed all of the code for 5 of them. I test the system, everything that is left runs fine. Then I take a snapshot of the VM and shut down for the day. The next day, I fire up the VM at the last snapshot to continue the process.\nHowever, now when I pull up the django website, I get a NoReverseMatch error for a namespace of an app that I had previously removed. And it is at line 0 of the base_template no less (which doesn't have a line 0). If I search through all of the remaining code, there is no longer any reference to the offending namespace, so I don't understand where this is coming from.\nCould it be django template caching? This error is reproducible as I go back through my snapshots, although the offending namespace name is different each time.\nThanks,\nMark","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":17,"Q_Id":51574927,"Users Score":0,"Answer":"Update\nI still do not know why the ghost error happens when references to apps are commented out from templates, etc.\nTurning off django caching did not have any effect.\nWhat seemed to fix it was deleting the lines completely. After I deleted all of the lines I had previously commented out, the errors stopped happening.","Q_Score":0,"Tags":"python,django,templates,gunicorn,parallels","A_Id":51575958,"CreationDate":"2018-07-28T20:13:00.000","Title":"Ghost NoReverseMatch Error for Django app in Parallels VM","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a web application set-up with Django (Python), and I want to convert it to an Android app (.apk).\nQuestion 1 : Can I use Django (with some extra-packages) to create the .apk\nQuestion 2 : Do I have to use Android Studio ? (I'm using Atom as a Text Editor).","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":532,"Q_Id":51579606,"Users Score":1,"Answer":"No you cant. Django is a web framework not a kit to develop android applications","Q_Score":0,"Tags":"android,python,django,android-studio,apk","A_Id":51580239,"CreationDate":"2018-07-29T11:00:00.000","Title":"Django to Android","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I don't know what title should be, I just got stuck and need to ask.\nI have a model called shift\nand imagine the db_table like this:\n\n#table shift\n+---------------+---------------+---------------+---------------+------------+------------+\n| start         | end           | off_start     | off_end       | time       | user_id    |\n+---------------+---------------+---------------+---------------+------------+------------+\n| 2018-01-01    | 2018-01-05    | 2018-01-06    | 2018-01-07    | 07:00      | 1          |\n| 2018-01-08    | 2018-01-14    | 2018-01-15    | Null          | 12:00      | 1          |\n| 2018-01-16    | 2018-01-20    | 2018-01-21    | 2018-01-22    | 18:00      | 1          |\n| 2018-01-23    | 2018-01-27    | 2018-01-28    | 2018-01-31    | 24:00      | 1          |\n| ....          | ....          | ....          | ....          | ....       | ....       |\n+---------------+---------------+---------------+---------------+------------+------------+\n\nif I use queryset with filter like start=2018-01-01 result will 07:00\nbut how to get result 12:00 if I Input 2018-01-10 ?...\nthank you!","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":113,"Q_Id":51579732,"Users Score":1,"Answer":"Question isnt too clear, but maybe you're after something like \nstart__lte=2018-01-10, end__gte=2018-01-10?","Q_Score":0,"Tags":"python,django","A_Id":51579769,"CreationDate":"2018-07-29T11:14:00.000","Title":"Django Queryset find data between date","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Why am I getting this error? I'm running v 3.8.2 of DRF. I'm wondering if docker has anything to do with it. Maybe the interpreter is trying to use\/find some other installation I have on my machine. Any suggestions\/help would be great. Thanks\nThis line is failing\nfrom rest_framework.decorators import action\nI'm replacing the list_route method to action on this line\n@action(methods=['POST'], permission_classes=[IsAuthenticated, ])\nI'm running a virtualenv created in pycharm and running pip freeze gives me:\n\n$ pip freeze\n...\nDjango==1.10.8\ndjango-extensions==2.1.0\ndjango-rest-swagger==2.2.0\ndjango-widget-tweaks==1.4.1\ndjangorestframework==3.8.2\n...\n\n\nbackend_1   | Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x7fa4163708c8>\nbackend_1   | Traceback (most recent call last):\nbackend_1   |   File \"\/usr\/local\/lib\/python3.6\/site-packages\/django\/utils\/autoreload.py\", line 226, in wrapper\nbackend_1   |     fn(*args, **kwargs)\nbackend_1   |   File \"\/usr\/local\/lib\/python3.6\/site-packages\/django\/core\/management\/commands\/runserver.py\", line 121, in inner_run\nbackend_1   |     self.check(display_num_errors=True)\nbackend_1   |   File \"\/usr\/local\/lib\/python3.6\/site-packages\/django\/core\/management\/base.py\", line 374, in check\nbackend_1   |     include_deployment_checks=include_deployment_checks,\nbackend_1   |   File \"\/usr\/local\/lib\/python3.6\/site-packages\/django\/core\/management\/base.py\", line 361, in _run_checks\nbackend_1   |     return checks.run_checks(**kwargs)\nbackend_1   |   File \"\/usr\/local\/lib\/python3.6\/site-packages\/django\/core\/checks\/registry.py\", line 81, in run_checks\nbackend_1   |     new_errors = check(app_configs=app_configs)\nbackend_1   |   File \"\/usr\/local\/lib\/python3.6\/site-packages\/django\/core\/checks\/urls.py\", line 14, in check_url_config\nbackend_1   |     return check_resolver(resolver)\nbackend_1   |   File \"\/usr\/local\/lib\/python3.6\/site-packages\/django\/core\/checks\/urls.py\", line 24, in check_resolver\nbackend_1   |     for pattern in resolver.url_patterns:\nbackend_1   |   File \"\/usr\/local\/lib\/python3.6\/site-packages\/django\/utils\/functional.py\", line 35, in __get__\nbackend_1   |     res = instance.__dict__[self.name] = self.func(instance)\nbackend_1   |   File \"\/usr\/local\/lib\/python3.6\/site-packages\/django\/urls\/resolvers.py\", line 313, in url_patterns\nbackend_1   |     patterns = getattr(self.urlconf_module, \"urlpatterns\", self.urlconf_module)\nbackend_1   |   File \"\/usr\/local\/lib\/python3.6\/site-packages\/django\/utils\/functional.py\", line 35, in __get__\nbackend_1   |     res = instance.__dict__[self.name] = self.func(instance)\nbackend_1   |   File \"\/usr\/local\/lib\/python3.6\/site-packages\/django\/urls\/resolvers.py\", line 306, in urlconf_module\nbackend_1   |     return import_module(self.urlconf_name)\nbackend_1   |   File \"\/usr\/local\/lib\/python3.6\/importlib\/__init__.py\", line 126, in import_module\nbackend_1   |     return _bootstrap._gcd_import(name[level:], package, level)\nbackend_1   |   File \"<frozen importlib._bootstrap>\", line 978, in _gcd_import\nbackend_1   |   File \"<frozen importlib._bootstrap>\", line 961, in _find_and_load\nbackend_1   |   File \"<frozen importlib._bootstrap>\", line 950, in _find_and_load_unlocked\nbackend_1   |   File \"<frozen importlib._bootstrap>\", line 655, in _load_unlocked\nbackend_1   |   File \"<frozen importlib._bootstrap_external>\", line 678, in exec_module\nbackend_1   |   File \"<frozen importlib._bootstrap>\", line 205, in _call_with_frames_removed\nbackend_1   |   File \"\/project_backend\/project_backend\/urls.py\", line 20, in <module>\nbackend_1   |     from apps.app_name.views import XYZViewSet\nbackend_1   |   File \"\/project_backend\/apps\/app_name\/views.py\", line 4, in <module>\nbackend_1   |     from rest_framework.decorators import action\nbackend_1   | ImportError: cannot import name 'action'","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":3579,"Q_Id":51598930,"Users Score":3,"Answer":"My virtual environment and docker container were not using the same django rest framework version. I had to ssh into my docker container via docker exec -it <container_id> bash and run pip install djangorestframework --upgrade this gave me the 3.8.2 version I was looking for.\nDocker installed 3.4.7 because I used to have djangorestframework<3.5 in the requirements file and the container was stored in that state. I could have deleted the container and rerun docker-compose up to recreate the container with the newer version of 3.8.2. I of course opted to just upgrade with pip instead.","Q_Score":1,"Tags":"python,django,django-rest-framework","A_Id":51601919,"CreationDate":"2018-07-30T16:58:00.000","Title":"DRF ImportError: cannot import name 'action' on v3.8.2","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I create many records in my DB as follows:\nSubproducts.create(mf_id=mf_id,\n                     co=co,\n                     mf_binary=mf_binary_data.getbuffer())\nmf_binary type is io.BytesIO() - it is binary representation of binary files collected into zipfile\nI've successfully created many records using this approach, however I have an issue with one particular dataset. \nIt is a bigger than other and it takes ~1,2GB. \nWhen I try to save it in DB following error occurs.\npeewee.InterfaceError: Error binding parameter 2 - probably unsupported type.\nField of mf_binary in my model is peewee.BlobField(default=b'0')\nHow can I store this kind of data in peewee Database?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":597,"Q_Id":51600405,"Users Score":0,"Answer":"Calling getbuffer() returns a memoryview object which is apparently not supported by the underlying database driver (which one is it, by the way?). The InterfaceError is raised by your database driver as opposed to Peewee, which indicates the problem comes from your driver not understanding how to handle memoryview objects.\nYour best bet is to use mf_binary_data.getvalue(), which should return a bytes object.","Q_Score":1,"Tags":"python,database,orm,zip,peewee","A_Id":51601055,"CreationDate":"2018-07-30T18:47:00.000","Title":"peewee.InterfaceError: Error binding parameter while saving big amout of data","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an s3 bucket which has a large no of zip files having size in GBs. I need to calculate all zip files data length. I go through boto3 but didn't get it.\nI am not sure if it can directly read zip file or not but I have a process-\n\nConnect with the bucket.\nRead zip files from the bucket folder (Let's say folder is Mydata).\nExtract zip files to another folder named Extracteddata.\nRead Extracteddata folder and do action on files.\n\nNote: Nothing shouldn't download on local storage. All process goes on S3 to S3.\nAny suggestions are appreciated.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":8072,"Q_Id":51604689,"Users Score":0,"Answer":"This is not possible.\nYou can upload files to Amazon S3 and you can download files. You can query the list of objects and obtain metadata about the objects. However, Amazon S3 does not provide compute, such as zip compression\/decompression.\nYou would need to write a program that:\n\nDownloads the zip file\nExtracts the files\nDoes actions on the files\n\nThis is probably best done on an Amazon EC2 instance, which would have low-latency access to Amazon S3. You could do it with an AWS Lambda function, but it has a limit of 500MB disk storage and 5 minutes of execution, which doesn't seem applicable to your situation.\nIf you are particularly clever, you might be able to download part of each zip file ('ranged get') and interpret the zipfile header to obtain a listing of the files and their sizes, thus avoiding having to download the whole file.","Q_Score":1,"Tags":"python,amazon-web-services,amazon-s3,boto3","A_Id":51604927,"CreationDate":"2018-07-31T02:36:00.000","Title":"Read zip files from amazon s3 using boto3 and python","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am not trying to get all duplicate querysets and I am not trying to compare two queryset results and see of the two comparison are the same.\nSomehow, I have no idea how this happened yet but sometimes there are records being saved twice and some not.  So when I do querying my result would sometimes have duplicates.\nFor example, I am just doing Model.objects.filter(user='myname')\nI would get maybe 50 instances back, all of them should be different.  But somehow maybe id 11 and 12 have the exact same values then 23 and 24 has the same values and the others are totally fine.\nSo actually within those 50 instances, there are 2 duplicates which means I should only have 48 instances instead of 50 to be accurrate.\nIs there a way to check the queryset and return only one of the duplicates with other querysets if the values are totally the same?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":138,"Q_Id":51612266,"Users Score":0,"Answer":"you can do that using distinct in your orm query eg.Model.objects.filter(user='myname').distinct('field_name')\nthis will give you only distinct values based on the field that you provide.","Q_Score":0,"Tags":"python,django,duplicates,django-queryset","A_Id":51613297,"CreationDate":"2018-07-31T11:25:00.000","Title":"is there a way to only get one of the duplicates in a queryste? django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have developed two applications, one ReactJS, and one Python using Flask. The development was for ReactJS only at first, but then I created the Flask app to use it to write to files on server, and run batch files. I am getting the data from an API that belongs to another application. The Flask app is the only app to communicate with the API, while the React app gets the data to display by sending to Flask. Also using a Flask app as a middle agent made the CORS issue go away so far.\nNo the question is, what is the best practice to deploy on windows server under current circumstances? I searched and found that I have two options, IIS and Apache. I never deployed any application before other that on Heroku, so I'm far from familiar with the task.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":624,"Q_Id":51625930,"Users Score":0,"Answer":"I made my reactjs app a static single-page-app (npm run build ) and hosted the js files through a custom flask endpoint.\nThis may not be an option for you though in which case you can configure apache (or iis) to host both flask (with mod_wsgi) and proxy nodejs react.\nYou can also run both sites on a different port or vhost but then you may have to configure CORS.","Q_Score":0,"Tags":"python,reactjs,flask,deployment,windows-server-2012","A_Id":51634777,"CreationDate":"2018-08-01T05:34:00.000","Title":"What is the best way to deploy a Python Flask application along with a ReactJS application?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How would I configure structlog such that all messages including above info would go to stdout using a KeyValueRenderer while all logging would also go to a file using a JSONRenderer?\nnote: I only want to use structlog, no standard library stuff","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":253,"Q_Id":51627041,"Users Score":0,"Answer":"structlog doesn't do this out of the box, you'll need to write the required code yourself. structlog is built in a way to make this straightforward and it should be around a dozen of LoC.","Q_Score":1,"Tags":"python,json,rendering,stdout,structlog","A_Id":51656861,"CreationDate":"2018-08-01T06:51:00.000","Title":"setting up trees of renderers in structlog","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm migrating a drupal website to Django, and I need to get the post (news) from my drupal installation... The question is: what tables do I need to read to do that?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":32,"Q_Id":51661275,"Users Score":0,"Answer":"You need to read the node table and also see all fields involved in your content type, drupal create a table by field, for example: \nContent type News contains the following fields: \ntitle\nbody\nfield_image\nThen you need to read the following tables: \nNode\nfield_data_body\nfield_data_field_image","Q_Score":0,"Tags":"mysql,django,python-3.x,drupal-7","A_Id":51667972,"CreationDate":"2018-08-02T19:58:00.000","Title":"Migrate data from Drupal 7","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I use JanusGraph, HBase and Python (through gremlin_python) to create and store a sample graph. Now I'd like to do some graph anaysis (eg. page rank), and wish to stick to Python.  I'm wondering if it's possible to query a graph from JanusGraph in DataFrame format, then ingest into GraphFrame to calculate pageRank? \nThe key questions are how can I bridge between JanusGraph + GraphFrame using Python, i.e.\n1. query a graph which returns in one format\n2. call GraphFrame API to caluclate PageRank.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":234,"Q_Id":51667488,"Users Score":1,"Answer":"As far as I am concerned, there is not official connector available for transforming query results of JanusGraph into Spark DataFrame (and then Graph in GraphFrame).\nThus, you must manually write code to performe the transformation. You can use gremlin-python package to query JanusGraph and then using Spark to feed the result set into Spark DataFrame.","Q_Score":0,"Tags":"python-2.7,apache-spark,apache-spark-sql,gremlin,janusgraph","A_Id":53847802,"CreationDate":"2018-08-03T07:33:00.000","Title":"Janusgraph query returns dataframe to perform analysis using GraphFrame","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Heroku restarts every 24 hours, is there any way I can program it to not do this, or update my files that are inside it every 23h or 24h?\nI use python, and use heroku to host my discord bot.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":131,"Q_Id":51679928,"Users Score":0,"Answer":"You can't store information on Heroku file system,\nyou need to store your data in some database, for example, Postgres or MongoDB.\nThe can be added easily as an addon on Resources tab.","Q_Score":1,"Tags":"python,heroku,bots,discord","A_Id":51706590,"CreationDate":"2018-08-03T20:48:00.000","Title":"Heroku update files inside it every 24h","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Using apache web hosting I launched my first web app today and I noticed that if I put examply.com\/example.py in my web browser I can see my python source code with my sql password in it. \nHow do I prevent this?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":182,"Q_Id":51690304,"Users Score":0,"Answer":"Chown your python file with 640 will give a FORBIDDEN in the browser but the server will be able to execute it in PHP for example:\n$output = shell_exec(\"python python-test.py\");\necho ($output);","Q_Score":0,"Tags":"python,apache","A_Id":61774431,"CreationDate":"2018-08-04T23:29:00.000","Title":"How to hide serverside python file from web browser?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I try the conversation on the IBM cloud and every things works fine starting with the welcome node where I have set many context variables there, Now I want to use a back-end language like python or Node.js to try that so, But I only can send the request and get the response but can't make the welcome node starts the conversation like happens on the cloud, Is there a solution for that?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":457,"Q_Id":51695315,"Users Score":1,"Answer":"If you want the welcome node to be triggered, send an empty string and empty context to the dialog.","Q_Score":0,"Tags":"python,node.js,ibm-cloud,watson-conversation","A_Id":51723780,"CreationDate":"2018-08-05T14:45:00.000","Title":"How to make IBM Watson Assistant welcome node starts the conversation with Node.js or Python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using odoo 9 and i have created in Settings -> Technical -> Database Structure -> Decimal Accuracy-> Account with digits 3 for subtotal rounding. Then i have added in sale.py price_subtotal = fields.Monetary(compute='_compute_amount', string='Subtotal', digits=dp.get_precision('Account'))\n. After that i updated the two modules sale and decimal_precision. But when i create a new saleorder there is no change in the subtotal rounding it display 2 digits instead of 3. Any help please i'm stuck with this problem for days now","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1001,"Q_Id":51703206,"Users Score":0,"Answer":"The solution is to modify the type of fields from Monetary to Float :\n price_subtotal = fields.Float(compute='_compute_amount', string='Subtotal', digits=dp.get_precision('Account'))","Q_Score":1,"Tags":"python-2.7,odoo-9","A_Id":51706123,"CreationDate":"2018-08-06T08:11:00.000","Title":"How to create a new decimal accuracy for subtotal in sale order odoo 9","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"This problem just started when I updated to python 3.7 (on macOS). Is there any fix or is it an issue with JetBrains? I want to use Django 2.1 with Python 3.7\nAlso when I select \"Run Server\" despite the error, everything seems to work perfectly fine.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":3589,"Q_Id":51715339,"Users Score":0,"Answer":"Open Run\/Debug Configuration page\nFind Enviroment \nChange Enviroment vaialbles to: PYTHONUNBUFFERED=1;DJANGO_SEETINGS=your_project_name.settings\n\n\nYou should show to Pycharm your projects settings file :) I hope it will work if you select correct Python Interpretet (venv)","Q_Score":4,"Tags":"django,pycharm,python-3.7","A_Id":59049357,"CreationDate":"2018-08-06T20:42:00.000","Title":"Using Python 3.7 on Pycharm gives me: \"Error: Django is not importable in this environment\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm new to backend and I've written a python script which imports libraries like Flask, sqlalchemy. From taking help from here and there I've been successfully able to get JSON as response to a get call using localhost or http:\/\/127.0.0.1\/.\nNow that this is done I want to take this action on a live server so right now I've hostgator and I've created a folder there so it'll be like mydomain.com\/api\/. Now my questions is that do I need to place an index.html in this folder which makes a call to run myscript.py or I can directly call mydomain.com\/api\/myscript.py and it'll return the JSON?\nMy script is basically a recommendation model that returns recommendations to users upon request.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":378,"Q_Id":51715736,"Users Score":0,"Answer":"It's possible to make a request via PHP with the curl_* functions, or you can do the same in JavaScript (e.g. within your HTML file) using AJAX (XMLHttpRequest).","Q_Score":1,"Tags":"python,json,flask,flask-sqlalchemy","A_Id":51715768,"CreationDate":"2018-08-06T21:15:00.000","Title":"How to Call API written in Python using HTML or PHP","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"By default subscribers get email messages once the new task in a project is created. How it can be tailored so that unless the projects has checkbox \"Send e-mail on new task\" checked it will not send e-mails on new task?\nI know how to add a custom field to project.project model. But don't know the next step.\nWhat action to override to not send the email when a new task is created and \"Send e-mail on new task\" is not checked for project?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":24,"Q_Id":51719138,"Users Score":0,"Answer":"I found that if project has notifications option \"\nVisible by following customers\" enabled then one can configure subscription for each follower. \nTo not receive e-mails when new task is added to the project: unmark the checkbox \"Task opened\" in the \"Edit subscription of User\" form.","Q_Score":0,"Tags":"python,email,task,project,odoo-10","A_Id":52330973,"CreationDate":"2018-08-07T05:02:00.000","Title":"On project task created do not send email","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am getting this error:\n\nAn error occurred initializing the application server: Failed to locate pgAdmin4.py, terminating server thread.\n\nAs it fails it will prompt to adjust the python and application path but I read an answer on Stack Overflow where the person said he deleted the path it worked for him and did so but it still gave me the same error and I don't see the prompt again.\nSo I went to pgAdmin official site only to see that if it fails I must enter python and application path. How can I configure the paths for the pgAmin. I am using Fedora 27.","AnswerCount":3,"Available Count":2,"Score":0.0665680765,"is_accepted":false,"ViewCount":12946,"Q_Id":51721210,"Users Score":1,"Answer":"For me, the solution was to sudo dnf remove pgadmin4* then sudo find \/ -iname \"*pgadmin4*\" and delete any scraps lying around, then sudo dnf install pgadmin4* - everything is now working fine.","Q_Score":4,"Tags":"python","A_Id":54191100,"CreationDate":"2018-08-07T07:30:00.000","Title":"An error occurred initializing the application server: Failed to locate pgAdmin4.py, terminating server thread","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am getting this error:\n\nAn error occurred initializing the application server: Failed to locate pgAdmin4.py, terminating server thread.\n\nAs it fails it will prompt to adjust the python and application path but I read an answer on Stack Overflow where the person said he deleted the path it worked for him and did so but it still gave me the same error and I don't see the prompt again.\nSo I went to pgAdmin official site only to see that if it fails I must enter python and application path. How can I configure the paths for the pgAmin. I am using Fedora 27.","AnswerCount":3,"Available Count":2,"Score":0.0665680765,"is_accepted":false,"ViewCount":12946,"Q_Id":51721210,"Users Score":1,"Answer":"Try to just delete the config file.  You may have an old one from a previous install.\n\nrm ~\/.config\/pgadmin\/pgadmin4.conf","Q_Score":4,"Tags":"python","A_Id":53857991,"CreationDate":"2018-08-07T07:30:00.000","Title":"An error occurred initializing the application server: Failed to locate pgAdmin4.py, terminating server thread","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Please give me a hint about how is it better to code a Python application which helps to organise ideas by tags. \nAdd a new idea:\nInput 1: the idea\nInput 2: corresponding tags\nSearch for the idea:\nInput 1: one or multiple tags\nAs far as I understood, it's necessary to create an array with ideas and an array with tags. But how to connect them? For example, idea number 3 corresponds to tags number 1 and 2. So the question is: how to link these two arrays in the most simple and elegant way?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":159,"Q_Id":51739732,"Users Score":0,"Answer":"Have two dictionaries:\n\nIdea -> Set of Tags\nTag -> Set of Ideas\n\nWhen you add a new idea, add it to the first dictionary, and then update all the sets of the tags it uses in the second dictionary. This way you get easy lookup by both tag and idea.","Q_Score":0,"Tags":"python,logic,tagging","A_Id":51760473,"CreationDate":"2018-08-08T06:15:00.000","Title":"Python app to organise ideas by tags","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I dont have much knowledge in dbs, but wanted to know if there is any technique by which when i update or insert a specific entry in a table, it should notify my python application to which i can then listen whats updated and then update that particular row, in the data stored in session or some temporary storage.\nI need to send data filter and sort calls again n again, so i dont want to fetch whole data from sql, so i decided to keep it local, nd process it from there. But i was worried if in the mean time the db updates, and i could have been passing the same old data to filter requests.\nAny suggestions?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":42,"Q_Id":51759304,"Users Score":1,"Answer":"rdbs only will be updated by your program's method or function sort of things.\nyou can just print console or log inside of yours.\nif you want to track what updated modified deleted things, \nyou have to build a another program to able to track the logs for rdbs\n\nthanks.","Q_Score":2,"Tags":"python,sql,sql-server,database,connection","A_Id":51759339,"CreationDate":"2018-08-09T05:17:00.000","Title":"Is there any way mssql can notify my python application when any table or row has been updated?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am developing a small web application with Flask. This application needs a DSL, which can express the content of .pdf files.\nI have developed a DSL with JetBrains MPS but now I'm not sure how to use it in my web application. Is it possible? Or should I consider to switch to another DSL or make my DSL directly in Python.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1223,"Q_Id":51762908,"Users Score":4,"Answer":"If you want to use MPS in the web frontend the simple answer is: no. \nSince MPS is a projectional editor it needs a projection engine so that user can interact with the program\/model. The projection engine of MPS is build in Java for desktop applications. There have been some efforts to put MPS on the web and build Java Script\/HTML projection engine but none of the work is complete. So unless you would build something like that there is no way to use MPS in the frontend. \nIf your DSL is textual anyway and doesn't leverage the projectional nature of MPS I would go down the text DSL road with specialised tooling for that e.g. python as you suggested or Xtext.","Q_Score":6,"Tags":"python,flask,dsl,jetbrains-ide,mps","A_Id":51779632,"CreationDate":"2018-08-09T09:03:00.000","Title":"Can I use JetBrains MPS in a web application?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using odoo version 9 and I've created a module to customize the reports of purchase order. Among the fields that I want displayed in the reports is the supplier reference for article but when I add the code that displays this field  <span> <t t-esc=\"', '.join([str(x.product_code) for x in o.order_line.product_id.product_tmpl_id.seller_ids])\"\/>\n  but it displays an error when I want to start printing the report\nQWebException: \"Expected singleton: purchase.order.line(57, 58, 59, 60, 61, 62, 63, 64)\" while evaluating\n\"', '.join([str(x.product_code) for x in o.order_line.product_id.product_tmpl_id.seller_ids])\"\nPS: I don't change anything in the module purchase. \nI don't know how to fix this problem any idea for help please ?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":125,"Q_Id":51764170,"Users Score":1,"Answer":"It is because your purchase order got several orderlines and you are hoping that the order will have only one orderline.\no.orderline.product_id.product_tmpl_id.seller_ids \nwill work only if there is one orderline otherwise you have loop through each orderline. Here o.orderline will have multiple orderlines and you can get product_id from multiple orderline. If you try o.orderline[0].product_id.product_tmpl_id.seller_ids it will work but will get only first orderline details. Inorder to get all the orderline details you need to loop through it.","Q_Score":0,"Tags":"python-2.7,odoo-9","A_Id":51797438,"CreationDate":"2018-08-09T10:03:00.000","Title":"How to solve error Expected singleton: purchase.order.line (57, 58, 59, 60, 61, 62, 63, 64)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it possible to run a python flask app that pulls from a sql database, while also running a python script that updates the sql database every few seconds?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":45,"Q_Id":51767855,"Users Score":1,"Answer":"Yes, databases are designed to handle this type of concurrent access. If the database is in the middle of an update, it will wait until the update is complete before handling the Flask app's query, and it will complete the query before starting the next incoming update.","Q_Score":0,"Tags":"python,sql,multithreading,sqlalchemy,flask-sqlalchemy","A_Id":51767955,"CreationDate":"2018-08-09T13:04:00.000","Title":"Pulling from database and updating database at the same time","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've almost 'finished' my first website. Which consists of an authors anthology, essentially 100's of pages containing individual articles. It's built with HTML and CSS.\nAt the bottom of each page I want to link to related pages, displaying the title and an image. How can I auto-populate these boxes by fetching related pages from a database? \nI'm just looking for someone to point me in the right direction, I will try to teach myself. I assume there would be some server side scripting? or loading the data into a sql?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":32,"Q_Id":51774081,"Users Score":0,"Answer":"You'll need some sort of server side program. Something that can query the database, then return the results either through an api or process it all server side and return the html. Below are some frameworks that can help. \nJava:\nPlay, Spring, Javalin, Dropwizard, etc. \nPython:\nDjango","Q_Score":0,"Tags":"java,python,html,mysql,server","A_Id":51774168,"CreationDate":"2018-08-09T19:00:00.000","Title":"Web Development: Dynamically linking to other related webpages","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have Google Cloud with Debian 9. There are python 2.7a and 3.5. 3.5 I did as default.\nI have apache where is PHP and I need to keep it there.\nI installed libapache2-mod-python configured virtual host and pure python file return me a correct result.\nI installed Flask framework and it throws an exception that ImportError: No module named Flask\nIt's my first time with Flask and in general with python in web.\nFor all examples I see mod_wsgi but I can't install it with libapache2-mod-python.\nMy questions are:\nDoes it's possible to run Flash with libapache2-mod-python module?\nIf no, then does mod_wsgi has no conflict with PHP apache module?\nThanks for any hints.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":99,"Q_Id":51774703,"Users Score":0,"Answer":"That sounds like you do not have flask installed. You may for example pip install flask to the particular python version that you are trying to run your flask app with.","Q_Score":0,"Tags":"python,apache,flask,debian","A_Id":51789220,"CreationDate":"2018-08-09T19:42:00.000","Title":"python 3.5 Flask install on apache 2.4","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to achieve the following behaviour: \n\nstart celery task using celery beat\nworker is killed\na new worker initiated\nthe task started over again\n\nfor doing so i set acks_late=True flag, and 'visibility_timeout': 30\nmeaning if the task did not ack in 30 seconds, a new one should be added to the queue\nfrom some reason this does not happen","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":846,"Q_Id":51780526,"Users Score":0,"Answer":"the problem seems to be with gevent\nwhen i monkey.patch_all() the retry mechanism will not work","Q_Score":0,"Tags":"python,redis,celery","A_Id":51794671,"CreationDate":"2018-08-10T06:44:00.000","Title":"celery with redis broker visibility timeout","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I want to upload my kivy application to Google Play store. For that i Need an .apk file , which has an api Level of 26 or higher. The .apk that I created had an apk Level of 19. So this was my way to set the Level to 26:\nI installed API 26,27,28 and the newest version of the building tool. \nIn buildozer.spec i set android.api = 26.\nAfter that I run \"buildozer android release deploy run\". And now I get this error:\n\"Check that aidl can be executed \nSearch for Aidl \nRun 'home\/dennis\/.buildozer\/android\/platform\/android-sdk-20\/build-tools\/28.0.2\/aidl' \nCWD None\nAidl cannot be executed\"\nWhat can i do to fix this? \nThank you!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1146,"Q_Id":51781916,"Users Score":0,"Answer":"Run ~\/.buildozer\/android\/platform\/android-sdk-20\/tools\/android\nSelect Android SDK Build-tools 26.x.x\nCheck aidl file in ~\/.buildozer\/android\/platform\/android-sdk-20\/build-tools\/26.x.x\/","Q_Score":0,"Tags":"android,python,kivy,apk,buildozer","A_Id":51831467,"CreationDate":"2018-08-10T08:10:00.000","Title":"Create kivy apk with buildozer ERROR: \"Aidl cannot be executed\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a site www.domain.com and wanted to get all of the urls from my entire website and how many times they have been clicked on, from the Google Analytics API. \nI am especially interested in some of my external links (the ones that don't have www.mydomain.com). I will then match this against all of the links on my site (I somehow need to get these from somewhere so may scrape my own site).\nI am using Python and wanted to do this programmatically. Does anyone know how to do this?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":346,"Q_Id":51800600,"Users Score":1,"Answer":"I have a site www.domain.com and wanted to get all of the urls from my\n  entire website and how many times they have been clicked on\n\nI guess you need parameter Page and metric Pageviews\n\nI am especially interested in some of my external links\n\nYou can get list of external links if you track they as events. \nTry to use some crawler, for example Screaming Frog. It allows to get internal and external links. Free use up to 500 pages.","Q_Score":0,"Tags":"python,google-analytics,web-crawler,google-analytics-api","A_Id":51801255,"CreationDate":"2018-08-11T14:25:00.000","Title":"Can I get a list of all urls on my site from the Google Analytics API?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I installed Mkdocs (Python 3.6.5) and edited and built Markdown files.\nI tried to open the main index.html file with a browser, but I cannot directly open HTML pages linked to other HTML files.\nUsing Command Prompt and typing \"mkdocs serve\", I can open linked pages. I know this is a normal function of Mkdocs without server.\nCan I use Mkdocs just on my local computer?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1314,"Q_Id":51816099,"Users Score":0,"Answer":"According to official documentation you can generate html files with mkdocs build. They will be stored in folder called site. You can open built files without having to run mkdocs serve.","Q_Score":4,"Tags":"python,python-3.x,mkdocs","A_Id":52155079,"CreationDate":"2018-08-13T06:09:00.000","Title":"How Can I use Mkdocs on local computer without server?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"You are using a Foreign key in Django models automatically _ id is added to the respective field while saving in db.\nIs the same happend to one to one and many to many relations in Django models?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":516,"Q_Id":51821722,"Users Score":0,"Answer":"In short: it happens for OneToOneFields, not for ManyToManyFields.\nA OneToOneField is actually nothing more than a ForeignKey field, but with unique=True, and some small changes (for example the reverse is not model_set, but just model, furthermore the reverse also directly results in a model object, not a queryset, since there is at most one such object). For a OneToOneField, we thus will have an fieldname_id column.\nNote that in the case of a ForeignKey\/OneToOneField, such column only exists where you defined the relation, not at the targeting model. If A has a OneToOneField to B, then you can query b_id, but there does not exists a a_id on the B model.\nFor a ManyToManyField that is not the case. Such relation is not represented in the column of that table, but by a separate table (that links to the two models in the relation).","Q_Score":1,"Tags":"python,django,django-models","A_Id":51821795,"CreationDate":"2018-08-13T11:51:00.000","Title":"One to one relation in django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've made a small python script to scrap the web. I would like to make a nice and simple web interface where the user can enter data to search for and have the result displayed as a list. \nI understand that there's many different ways to do that but don't know which one would be the best in my case. \nI would like something :\n\nReally simple and light\nRunning locally with the less dependencies possible. \n\nSo far I've thinking about : \n\nA NodeJS server displaying content and executing the script \nA web framework in Python (web.py, Flask, Django..?)\nA local webserver (XAMPP) and cgi \n\nPlease note that I don't know much about web in python but I'm a bit used to NodeJS.  \nWhat would you recommend ? \nThanks, Victor","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":2380,"Q_Id":51848143,"Users Score":0,"Answer":"Socket.io ist Very easy to send Data between Websites and scripts.\nThe Website Connect with the Socket.io Server and Inside the Server the Python Script can be executed","Q_Score":0,"Tags":"python,web,interface","A_Id":51848568,"CreationDate":"2018-08-14T18:57:00.000","Title":"Best way to make a web interface for python script","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've made a small python script to scrap the web. I would like to make a nice and simple web interface where the user can enter data to search for and have the result displayed as a list. \nI understand that there's many different ways to do that but don't know which one would be the best in my case. \nI would like something :\n\nReally simple and light\nRunning locally with the less dependencies possible. \n\nSo far I've thinking about : \n\nA NodeJS server displaying content and executing the script \nA web framework in Python (web.py, Flask, Django..?)\nA local webserver (XAMPP) and cgi \n\nPlease note that I don't know much about web in python but I'm a bit used to NodeJS.  \nWhat would you recommend ? \nThanks, Victor","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":2380,"Q_Id":51848143,"Users Score":1,"Answer":"Personally I prefer gevent, bottle or Flask, and some front end framework like bootstrap or framework7.  \nGevent easily makes it asynchronous and has websockets built right in, and bottle is the easiest (and fastest) way to build a web app or api.","Q_Score":0,"Tags":"python,web,interface","A_Id":51848647,"CreationDate":"2018-08-14T18:57:00.000","Title":"Best way to make a web interface for python script","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I found a website i want to send POST requests to and then get the HTML code of the following GET request. Is there any way I can find out how these routes are organised? I wanted to do multiple searches by using a form on the site while looping through an array on a website through python.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":35,"Q_Id":51848283,"Users Score":0,"Answer":"There is a good chance the website has its API available for you to use? Inside developer tools, look at the Network tab and look for AJAX requests or XMLHttpRequests as a hint; perhaps make use of a requests type-package and go from there.  \nThere is also a very good chance the website follows a Restful architecture to create its routes. Surely there are interesting reads on the very first results-page of Google for this topic; stack overflow answers most likely.\nHowever, if you're question is why would a website not completely exposing its backend then you might not have considered the consequences.","Q_Score":0,"Tags":"html,python-3.x,routing","A_Id":51849147,"CreationDate":"2018-08-14T19:07:00.000","Title":"Learning the Route Structure of a Website","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"[Python - Beam SDK]\nI would like to be able to test timing issues in integration tests, so I want to build a generator system that pipes in messages into my Beam application with timestamps I specify. My current idea is to an application write to ports (one for each stream I want to listen to), and then have the Beam application listen to these ports (the same way it would listen to a Kafka topic). \nDoes Beam already have the ability to listen to a port as a source? And if not, what would be the best way to make this?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":123,"Q_Id":51850595,"Users Score":0,"Answer":"My experience with the [Java SDK]\nIn the way i see it a SocketIIO.read() implementation should just emit String (or byte[]) back. So creating a PTransform that open the port and then on the expand() method create a loop to just read the String (or byte[]) and then emit the values into the pipeline (returning a PColletion).\nHope it gives you an idea.","Q_Score":0,"Tags":"python,apache-beam,apache-beam-io","A_Id":51858983,"CreationDate":"2018-08-14T22:31:00.000","Title":"Apache Beam Input from Ports","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"In Django, if you don't specify primary key, it will add an integer autofield. My question is that if this incremental id, reaches integer limit, what is expected to happen after?","AnswerCount":2,"Available Count":2,"Score":-0.0996679946,"is_accepted":false,"ViewCount":155,"Q_Id":51853072,"Users Score":-1,"Answer":"in postgresql maximum amount of ID fields is 9223372036854775807\nif your database have these amount of record its not work. assume a simple query with ordering take more than a year to execute\nor if each record take 100 Byte (with index and ... data its too few for each record) this amount of record takes 838860700 TB storage. there is no storage to store these amount of data in all over the world.","Q_Score":0,"Tags":"python,django,python-3.x,postgresql,django-models","A_Id":51853178,"CreationDate":"2018-08-15T04:42:00.000","Title":"What if django model incremental pk finished","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In Django, if you don't specify primary key, it will add an integer autofield. My question is that if this incremental id, reaches integer limit, what is expected to happen after?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":155,"Q_Id":51853072,"Users Score":0,"Answer":"The database will raise an error and inserting whatever you're inserting will fail.\nIf you are using MySQL, the error will probably be something like this : ERROR 1467 (HY000): Failed to read auto-increment value from storage engine. \nThe limit for django's auto increment id is  2,147,483,647. So it's pretty unlikely that you will hit this limit unless you're storing extremely large amounts of data. If you are using large amounts of data, you can use the bigint type for the field instead.","Q_Score":0,"Tags":"python,django,python-3.x,postgresql,django-models","A_Id":51853180,"CreationDate":"2018-08-15T04:42:00.000","Title":"What if django model incremental pk finished","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to run a Flask application as a Windows service. I managed to convert it to a Windows service using win32serviceutil. The problem I have is that it only works when I manually run PythonService.exe (with the -debug flag) from the \"activated\" environment (of course).\nIs there a way to activate the environment before attempting to run the service?\nI see some people used the Task Scheduler as a workaround but I'd prefer if Windows service manager could be used instead.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":782,"Q_Id":51861488,"Users Score":1,"Answer":"I figured it out. The trick is to use pyinstaller to generate an EXE. This way all libraries will be included, and there will be no need to mess with the system environment variables.","Q_Score":2,"Tags":"python,windows,windows-services,anaconda","A_Id":51863823,"CreationDate":"2018-08-15T15:12:00.000","Title":"Windows service running in a Anaconda environment?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a single gunicorn worker process running to read an enormous excel file which takes up to 5 minutes and uses 4GB of RAM. But after the request was finished processing I noticed at system monitor that it stills allocating 4GB of RAM forever. Any ideas on what to do to release the memory?","AnswerCount":2,"Available Count":1,"Score":-0.0996679946,"is_accepted":false,"ViewCount":3631,"Q_Id":51866904,"Users Score":-1,"Answer":"--max-requests 1 worked for me for a similar case.","Q_Score":6,"Tags":"python,gunicorn","A_Id":63113091,"CreationDate":"2018-08-15T21:47:00.000","Title":"Gunicorn worker doesn't deflate memory after request","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to work with Kafka for data ingestion but being new to this, i am kind of pretty much confused.I have multiple  crawlers, who extract data for me from web platform. Now, the issue is i want to ingest that extract data to Hadoop using Kafka without any middle scripts\/service file . Is it possible ?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1991,"Q_Id":51876515,"Users Score":2,"Answer":"without any middle scripts\/service file . Is it possible ?\n\nUnfortunately, no. \nYou need some service that's writing into Kafka (your scraper). Whether you produce into Kafka HTTP links (then write an intermediate consumer\/producer that generates the scraped results), or only produce the final scraped results, that's up to you. \nYou also need a second service consuming those topic(s) that writes to HDFS. This could be Kafka Connect (via Confluent's HDFS Connector library), or PySpark (code you'd have to write yourself), or other options that include \"middle scripts\/services\".\nIf you'd like to combine both options, I would suggest taking a look at Apache Nifi or Streamsets, which can perform HTTP lookups, (X)HTML parsing, and Kafka+HDFS connectors, all configured via a centralized GUI. Note: I believe any Python code would have to be rewritten in a JVM language to support major custom parsing logic in this pipeline","Q_Score":1,"Tags":"python,apache-kafka,web-crawler,kafka-producer-api","A_Id":51887428,"CreationDate":"2018-08-16T11:57:00.000","Title":"Data ingestion using kafka from crawlers","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I would like to get images from a search engine, to run some automated tests without the need to go online and pick them by hand.\nI found an old example from 5 years ago (ajax.googleapis.com\/ajax\/services\/search\/images), which sadly does not work anymore. What is the current method to do so in Python3? Ideally I would like to be able to pass a string with the search name, and retrieve a set amount of images, at full size.\nI don't really mind which search engine is used; I just want to be sure that it is supported for the time being. Also I would like to avoid Selenium; I am planning to run this without any UI nor using the browser, all from terminal.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":33,"Q_Id":51882099,"Users Score":0,"Answer":"Found a pretty good solution using BeautifulSoup.\nIt does not work on Google, since I get 403, but when faking the header in the request, is possible to get sometimes, data. I will have to experiment with different other sites.\nSo far the workflow is to search in the browser so I can get the url to pass to beautifulsoup. Once I get the url in code, I replaced the query part with a variable, so I can pass it programmatically.\nThen I parse the output of beautifulsoup to extract the links to the images, and retrieve them using requests.\nI wish there was a public API to get also parameters like picture size and such, but I found nothing that works currently.","Q_Score":1,"Tags":"python-3.x","A_Id":51900744,"CreationDate":"2018-08-16T17:04:00.000","Title":"Python - make a search and retrieve a set amount of images from a search engine","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"When running the commands in idle I can get an API call to work using oauth2. Then when trying to use the same lines of code in web2py I was getting an error that the web2py module wasn't found. So I installed Oauth2 into the module folder of the web2py project files. \nThis changed the error from the oauth2 module not found to \n (ImportError('No module named version',), )\nAny ideas to find a fix would be appreciated.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":132,"Q_Id":51885506,"Users Score":0,"Answer":"As an update I figured out that the issue was because Web2py doesn't support python 3 at this point in time.","Q_Score":0,"Tags":"python,oauth-2.0,web2py","A_Id":51901525,"CreationDate":"2018-08-16T21:22:00.000","Title":"Web2py error:  (ImportError('No module named version',), )","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a long task, that is adding many records to a database table.\nIn the table, there is a field called \"end\". This field will be empty until the task is done. As soon as the task is done, I will write a value in the \"end\" field.\nCan I have an HTML page, that is refreshing the page every 5 seconds with the items from the table until the field \"end\" has a value?\nDoes somebody have an example script for this?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":98,"Q_Id":51888992,"Users Score":0,"Answer":"You can try use websocket. Socket is listening and wait on datas. Django the use form django-channels","Q_Score":3,"Tags":"python,django,python-3.x,django-models","A_Id":51889286,"CreationDate":"2018-08-17T05:37:00.000","Title":"Django Refresh database until end of transaction","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an Apache server A set up that currently hosts a webpage of a bar chart (using Chart.js). This data is currently pulled from a local SQLite database every couple seconds, and the web chart is updated.\nI now want to use a separate server B on a Raspberry Pi to send data to the server to be used for the chart, rather than using the database on server A.\nSo one server sends a file to another server, which somehow realises this and accepts it and processes it.\nThe data can either be sent and placed into the current SQLite database, or bypass the database and have the chart update directly from the Pi's sent information.\nI have come across HTTP Post requests, but not sure if that's what I need or quite how to implement it.\nI have managed to get the Pi to simply host a json file (viewable from the external ip address) and pull the data from that with a simple requests.get('ip_address\/json_file') in Python, but this doesn't seem like the most robust or secure solution.\nAny help with what I should be using much appreciated, thanks!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":32,"Q_Id":51897917,"Users Score":0,"Answer":"Maybe I didn't quite understand your request but this is the solution I imagined:\n\nYou create a Frontend with WebSocket support that connects to Server A\nServer B (the one running on the raspberry) sends a POST request\nwith the JSON to Server A\nServer A accepts the JSON and sends it to all clients connected with the WebSocket protocol\n\nServer B ----> Server A <----> Frontend\nThis way you do not expose your Raspberry directly and every request made by the Frontend goes only to Server A.\nTo provide a better user experience you could also create a GET endpoint on Server A to retrieve the latest received JSON, so that when the user loads the Frontend for the first time it calls that endpoint and even if the Raspberry has yet to update the data at least the user can have an insight of the latest available data.","Q_Score":1,"Tags":"javascript,php,python,html,apache","A_Id":51898164,"CreationDate":"2018-08-17T14:49:00.000","Title":"Post file from one server to another","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I tried finding it on AWS documentation but couldn't find it..\nIs there a way to apply a security group \"sg-123\" on a running EC2 instance using Boto3?\nThanks!","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":868,"Q_Id":51898575,"Users Score":1,"Answer":"Ok, found the answer:\nresponse = instance.modify_attribute(Groups=['sg-123'])","Q_Score":0,"Tags":"python,amazon-web-services,amazon-ec2,boto3","A_Id":51899113,"CreationDate":"2018-08-17T15:26:00.000","Title":"Changing Security Groups for EC2 Instance using Boto3","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to create map of the track with 30 or so points with Google Static Map API. The problem is that it supports only origin-23waypoints-end even with premium key. So the idea I got is to split the route into two and then merge those two images. The problem is that since the parts of the track will have different points it means that the map canvas won't be same which renders the merge (almost?) impossible.\nAnybody would have any idea how to solve this issue? I am helpless.\nThank you very much for any ideas. :)","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":240,"Q_Id":51901602,"Users Score":0,"Answer":"There is no good way to do this, to best of my knowledge.\nWhen solving the problem, we just went with multiple maps in the end. Everything is solvable yet this was not worth investing the time.\nIt's technically not an answer but an information for anybody attempting this. If you would be able to solve this, please post your solution here and I will mark it.","Q_Score":0,"Tags":"python,python-3.x,python-imaging-library,google-static-maps","A_Id":52975017,"CreationDate":"2018-08-17T19:13:00.000","Title":"Google Static Map API - image map with 25+ points","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to get the generated URL of a file in a test model I've created,\nand I'm trying to get the correct url of the file by: modelobject.file.url which does give me the correct url if the file is public, however if the file is private it does not automatically generate a signed url for me, how is this normally done with django-storages? \nIs the API supposed to automatically generate a signed url for private files? I am getting the expected Access Denied Page for 'none' signed urls currently, and need to get the signed 'volatile' link to the file.\nThanks in advance","AnswerCount":1,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":941,"Q_Id":51913046,"Users Score":6,"Answer":"I've figured out what I needed to do,\nin the Private Storage class, I forgot to put custom_domain = False originally left this line off, because I did not think I needed it however you absolutely do in order to generate signed urls automatically.","Q_Score":2,"Tags":"python,django,boto3","A_Id":51913176,"CreationDate":"2018-08-18T22:38:00.000","Title":"django-storages boto3 accessing file url of a private file","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I did develop most of the front end but I am thinking to hire a freelance frontend developer(HTML, CSS and JS) to refine the design and make the site look professional. I am not yet comfortable to share my code with him. \nIs there any way in which he can run the django app without having models.py & views.py and work on html, css and js files.\nAny leads on this matter is appreciated.\nThanks","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":630,"Q_Id":51918298,"Users Score":2,"Answer":"He can build pure HTML\/CSS\/JS pages that you can use afterwards as your Django templates and extend as you wish. It depends of the complexity of your templates I guess.","Q_Score":0,"Tags":"python,django","A_Id":51918336,"CreationDate":"2018-08-19T13:46:00.000","Title":"Running a django website without models.py and views.py","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using the DRF and ReactJS and I am trying to login with Patreon using \ndjango-rest-framework-social-oauth2. \nIn React, I send a request to the back-end auth\/login\/patreon\/ and I reach the Patreon OAuth screen where I say I want to login with PAtreon. Patreon then returns with a request to the back-end at accounts\/profile. At this point a python-social-oauth user has also been created.\nAt this point I'm confused. How do I make a request to Patreon to login, create a user in the back-end, and return the session information to the react front-end so that I can include the session information in all following requests from the front-end? I don't want the returned request to be at the backend\/accounts\/profile, do I?\nUpdate\nI now realize I can set the redirect url with LOGIN_REDIRECT_URL but still, how do I now retrieve the session id, pass it to the front-end, and include it with all requests?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":691,"Q_Id":51922459,"Users Score":0,"Answer":"Once you receive the user profile email, unique id, and other details from Patreon then create a user at the Database level.\nNow after creating a user at the Database level you have to log in the user using the Django login function or any other login mechanism before redirecting the user to the frontend with a session.  The redirect URL  for the home\/ landing page is provided by the Frontend side where they want to land the user after being successfully logged with session-id being set in cookies. Onward Frontend side can use session id in cookies for other requests.\nHere is the flow:\n\nReact JS -> auth\/login\/patreon\/ -> redirected to Patreon -> Redirected back to the Backend with  user information -> Create User (DB level) -> Login user  -> Redirect back to Frontend (React JS on a specific URL provided by Front end)","Q_Score":9,"Tags":"django,reactjs,django-rest-framework,python-social-auth","A_Id":70682638,"CreationDate":"2018-08-19T22:55:00.000","Title":"Django - DRF (django-rest-framework-social-oauth2) and React creating a user","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"On publishing updates to an existing wagtail page it raises a ValidationError with the message below.\nValidationError({'live_revision': ['page revision instance with id 33 does not exist.']})\nAll other actions such as drafting, submitting for moderation all work okay.\nOnly publishing the page with new updates raises the ValidationError effectively limiting the ability to update existing pages.","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":487,"Q_Id":51928023,"Users Score":2,"Answer":"Just faced a very similar issue.\nMake sure you are not using ParentalKey in a Page model.\nUse the regular Django models.ForeignKey instead.","Q_Score":1,"Tags":"python,django,wagtail,validationerror","A_Id":56551502,"CreationDate":"2018-08-20T09:44:00.000","Title":"Wagtail raises ValidationError on page update","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm currently writing a Flask app using virtual env. When I try and run some of my python files I am getting:\nImportError: No module named <module>\nIn this case, the module I am trying to use is 'Click'. If I do a pip freeze or a pip list inside the virtual env, I can see the module listed there. I'm inside my virtual env when I'm trying to run the .py file too. How come pip freeze\/list can find the module but my .py program cannot? Could it also be an issue with my .wsgi file?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":431,"Q_Id":51932231,"Users Score":0,"Answer":"Actually I've just figured this out, the path in my .wsgi file for \"activate_this.py\" was incorrect because I was trying to run it in an EC2 instance instead of my normal directory. After changing the path things seem to be working again :)","Q_Score":1,"Tags":"python,flask,virtualenv","A_Id":51933173,"CreationDate":"2018-08-20T13:51:00.000","Title":"No module named error but pip freeze shows module is instealled in virtualenv","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"First of all, I can't use any executables. I need to do this in pure Python but sadly requests and BS4 doesn't support JS pages and Selenium needs a webdriver which is an executable.\nDoes anyone knows \/ Is there any way to scrape a JS Rendered page using purely Python and it's modules without having to run any exe?\nI'm not asking for exact solutions, only for the method and modules, if it's \neven possible.\nThank you for reading this and thank you for any constructive comments!\nHave a nice day!\nFor the full context: I'm trying to run a web-scraping script on a daily basis on a cloud that doesn't allows running any exes. Tried it with Selenium and PhantomJS but got a no permission error.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":51,"Q_Id":51965133,"Users Score":0,"Answer":"Sorry for the misunderstanding, just noticed that the free version of the cloud didn't give permission for these. I got a paid one and it now works like a charm.","Q_Score":1,"Tags":"python,python-3.x,web-scraping","A_Id":51965854,"CreationDate":"2018-08-22T10:46:00.000","Title":"Any way to scrape a JS Rendered page without using executables in Python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a locally made Django website and I hosted it on Heroku, at the same time I push changes to anathor github repo. I am using built in Database to store data. Will other users be able to get the data that has been entered in the database from my repo (like user details) ?\nIf so how to prevent it from happening ? Solutions like adding files to .gitignore will also prevent pushing to Heroku.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":152,"Q_Id":51968194,"Users Score":0,"Answer":"The code itself wouldn't be enough to get access to the database. For that you need the db name and password, which shouldn't be in your git repo at all.\nOn Heroku you use environment variables - which are set automatically by the postgres add-on - along with the dj_database_url library which turns that into the relevant values in the Django DATABASES setting.","Q_Score":0,"Tags":"python,django,github,hosting","A_Id":51968425,"CreationDate":"2018-08-22T13:38:00.000","Title":"Will making a Django website public on github let others get the data in its database ? If so how to prevent it?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm building my first web application and I've got a question around process and best practice, I'm hoping the expertise on this website might be give me a bit of direction.\nEssentially, all the MVP is doing is going to be writing an overlay onto an image and presenting this back to the user, as follows;\n\nUser uploads picture via web form (into AWS S3) - to do\nPython script executes (in lambda) and creates image overlay, saves new image back into S3 - complete\nUser is presented back with new image to download - to do\n\nI've been running this locally as sort of a proof of concept and was planning on linking up with S3 today but then suddenly realised, what happens when there are two concurrent users and two images being uploaded with different filenames with two separate lambda functions working?\nThe only solution I could think of is having the image renamed upon upload with a record inserted into an RDS, then the lambda function to run upon record insertion against the new image, which would resolve half of it, but then how would I get the correct image relayed back to the user?\nI'll be clear, I have next to no experience in web development, I want the front end to be as dumb as possible and run everything in Python (I'm a data scientist, I can write Python for data analysis but no experience as a software dev!)","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":377,"Q_Id":51970168,"Users Score":0,"Answer":"You don't really need an RDS, just invoke your lambda synchronously from the browser.\nSo \n\nUpload file to S3, using a randomized file name\nInvoke your lambda synchronously, passing it the file name\nHave your lambda read the file, convert it, and respond with either the file itself (binary responses aren't trivial), or a path to the converted file in S3.","Q_Score":0,"Tags":"python,amazon-web-services,amazon-s3,architecture,software-design","A_Id":51976456,"CreationDate":"2018-08-22T15:24:00.000","Title":"Uploading an image to S3 and manipulating with Python in Lambda - best practice","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"i'm trying use PyBeacon package to make some Eddystone-UID using Raspberry PI 3+ device. Executing PyBeacon -i 321654987654321a321654a456b54699 command, for example, and using the Google App called \"Beacon Tools\" to register the Eddystone-UID beacon (ok detected into unregistered layer), when i try to register, the app tell me \"failed to connect\".\nWhen i use a hardware beacon with Eddystone support, i must to config each beacon in \"configure mode\" to can access OK using the app.\nIs it possible register into Google Beacon Plataform the eddystone beacons created using PyBeacon package?\nthanks alot!","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":427,"Q_Id":51973957,"Users Score":0,"Answer":"The user interface for the Beacon Tools app is confusing.  It does two very different things:\n\nRegistration - this sets up the beacon on Google's servers and ties it to your Google account.\nProvisioning - this tries to set the beacon hardware configuration (identifiers, transmission rate, etc.) on the physical hardware beacon itself by connecting to the beacon hardware over a bluetooth connection.  This only works on a hardware beacons that implement Google's Eddystone Bluetooth GATT registration service. (Most hardware beacons don't even do this.) And even then, this only works when you beacon is in configurable mode. \n\nThe fact that you see \"failed to connect\" suggest you are doing 2 when really what you want to do is 1.","Q_Score":0,"Tags":"python,raspberry-pi3,eddystone","A_Id":51974208,"CreationDate":"2018-08-22T19:33:00.000","Title":"PyBeacon eddystone-UID","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I know how to debug a flask application in Pycharm. The question is whether this is also possible in IntelliJ.\nI have my flask application debugging in Pycharm but one thing I could do in IntelliJ was evaluate expressions inline by pressing the alt + left mouse click. This isn't available in Pycharm so I wanted to run my Flask application in IntelliJ but there isn't a Flask template. \nIs it possible to add a Flask template to the Run\/Debug configuration? I tried looking for a plugin but couldn't find that either.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1566,"Q_Id":51995696,"Users Score":0,"Answer":"Yes, you can. Just setup the proper parameters for Run script into PyCharm IDE. After that you can debug it as usual py script. In PyCharm you can evaluate any line in debug mode too.","Q_Score":1,"Tags":"python,intellij-idea,flask","A_Id":51996045,"CreationDate":"2018-08-23T23:45:00.000","Title":"Can I debug Flask applications in IntelliJ?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have some debugging statements that I need to print out from my Django out, but I cannot find which file to look for them. They do not appear in the access logs or the error logs. Where can I find the file which they appear?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":1129,"Q_Id":52002793,"Users Score":1,"Answer":"They appear in your console where you run : python manage.py runserver\nOf course you need to trigger the functions where there are prints so they execute it.","Q_Score":1,"Tags":"python,django,apache,mod-wsgi","A_Id":52002845,"CreationDate":"2018-08-24T10:45:00.000","Title":"Where do print statements from Django app go?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"If requests.Session() can handle cookies and does almost everything that app.test_client() does. Then why use the app.test_client()?","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":3506,"Q_Id":52028124,"Users Score":2,"Answer":"test_client is already prebuilt into flask, this makes it easier for people to quickly test their programs. Both the requests utility and test_client server the same functionality, so the usage is just based on personal preference.","Q_Score":11,"Tags":"python,python-3.x,flask","A_Id":52045779,"CreationDate":"2018-08-26T16:21:00.000","Title":"Why use Flask's app.test_client() over requests.Session() for testing","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to run a django app on heroku with postgresql but i'm getting\nwhen i go to my app url i check the heroku logs --tail and see\n2018-08-27T10:37:19.086599+00:00 heroku[web.1]: State changed from starting to crashed\n2018-08-27T10:37:19.070449+00:00 heroku[web.1]: Process exited with status 127\n2018-08-27T10:37:18.986150+00:00 app[web.1]: bash: gunicorn: command not found\n\ni have a requirements.txt with gunicorn, the heroku python buildpack installed\ni try maybe installing gunicorn remotely with \nheroku run pip install -r requirements.txt\nbut i get\n\u203a   Error: remote requirements.txt not found in git remotes","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":715,"Q_Id":52040966,"Users Score":0,"Answer":"I'm also working with Django and saw this same exact error in heroku logs --tail a few minutes after I pushed updated to Heroku. Prior to the push to Heroku everything worked just fine.  \nTo solve this problem,  first I made sure that the following files that worked previously remain unchanged with the push:\n\nrequirements.txt\nAptfile\nProcfile  \nruntime \nwsgi\n\nSince these files remained unchanged, I concluded that something beyond my knowledge was causing issues. So I went into the app's Activity Feed in Heroku, found the version that I knew worked and clicked on the Roll back to here link.\nWhen that didn't work, per the recommendation of another user (whose comment I can't seem to find now), I removed all packages from the requirements.txt then pushed it up to Heroku so that all packages would be uninstalled in the app. Then I added back all packages to the requirements.txt and pushed it to Heroku. Now it works.","Q_Score":0,"Tags":"python,django,heroku","A_Id":59906843,"CreationDate":"2018-08-27T13:54:00.000","Title":"Heroku Django webapp getting error logs say gunicorn command not found but it is there","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to Django and Python having trouble with a Django command.\nBefore the query, I want to let you know that\n1) python is installed in my c drive and the path name is C:\\Users\\admin67\\AppDathea\\Local\\Programs\\Python\\Python37  \n2) The Djangp project is in the D drive and the path name is D:\/\/wisdompets  \n3) My python version is python 3.7.0  \nIn the windows shell I give the command python3 manage.py runserver  \nHowever this command is not running in my windows shell. I have tried all combinations such as python370, python37, python 3.7..0 but nothing works and I keep getting the message (see the attachment).\nThe error traceback that I get in the Windows shell is as below.\n\nThe term 'python3' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spe lling of the name, or if a path was included, verify that the path is correct and try again. At line:1 char:8 + python3 <<<< manage.py runserver + CategoryInfo : ObjectNotFound: (python3:String) [], CommandNotFoundException + FullyQualifiedErrorId : CommandNotFoundException\n\nPlease help me resolve this error.\nThanks & Regards Manish","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1620,"Q_Id":52051909,"Users Score":1,"Answer":"Your Python PATH variable is not configured properly. Having Django project and Python interpreter in different locations is not the problem here. The CMD will find the python.exe from the PATH variable defined in the system. If it can't find it then it will raise an error. \nPlease go to PATH in your Environment variables (Right click on This PC > Properties > Advanced System Settings > Environment Variables \nAnd check if that exact path of your python.exe(That you mentioned) is there in your PATH. It likely isn't there and that's the reason you're seeing this error. \nTo resolve it, \nClick on Path variable and edit it. Now add the directory where your Python is installed. i.e \"C:\\Users\\admin67\\AppDathea\\Local\\Programs\\Python\\Python37\" , \nRestart your CMD or PowerShell and Python should now be recognized.\npip also must now be recognized and then 'pip install django==1.11.7' in your cmd, as that is what wisdompets need. If you don't specify the version it will fetch the latest version(Django 2.1 as of now) and entire code will break.\nNow in your CMD. \npython manage.py runserver\nHope this helps !","Q_Score":1,"Tags":"python,django","A_Id":52052194,"CreationDate":"2018-08-28T07:02:00.000","Title":"Django command giving error","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was postponing this question since i am not sure this is the right place to ask it. But i don't find a clear answer either.\nI am running pycharm 2018.1.4, on windows and it seems that i can't change the virtual env that running in the terminal in pycharm. When i check the python version in the terminal i get version 2.7.3, for the project interpreter i have python 3.6 and for my run configurations i have the same 3.6 interpreter. There are no problems running the development server or anything like that, just in the terminal i can't run the manage.py script without getting following.\n\nImportError: Couldn't import Django. Are you sure it's installed and\n  available on your PYTHONPATH environment variable? Did you forget to\n  activate a virtual environment?\n\nI understand the error, i just dont get why it is using that virtuals env instead of the one configured as project interpreter. Anyone else stumbled upon this problem?","AnswerCount":3,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1759,"Q_Id":52061978,"Users Score":1,"Answer":"As far as i know, Pycharm's terminal is not bound to Project Interpreter and the IDE related features.\nTo make it work, you'll have to manually activate your virtualenv in the terminal.","Q_Score":1,"Tags":"python,django,pycharm,virtualenv","A_Id":52062062,"CreationDate":"2018-08-28T15:57:00.000","Title":"Changing the virtualenv for the terminal in pycharm","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is there a way to provide a single URL for a user to download all the content from an S3 path?\nOtherwise, is there a way to create a zip with all files found on an S3 path recursively?\nie. my-bucket\/media\/123\/*\nEach path usually has 1K+ images and 10+ videos.","AnswerCount":3,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":3130,"Q_Id":52064420,"Users Score":3,"Answer":"There's no built-in way. You have to download all files, compact them \"locally\", re-upload it, and then you'll have a single URL for download.","Q_Score":1,"Tags":"python,amazon-web-services,amazon-s3,aws-lambda","A_Id":52064465,"CreationDate":"2018-08-28T18:43:00.000","Title":"Create a zip with files from an AWS S3 path","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Today I'm after a little tricky situation. I have been using Flask-socketio process based on eventlet. To do so, I need to monkey-patch the Thread module, the socket and os modules too.\nWhat happens is that I'm running a background thread within the Flask-socketio process that is working fine. Now this thread will create after a while a Process (from another script, Process.py) that will be in charge of processing images, and will communicate with it using SimpleQueues. To fecth the images the second process launch a camera thread (picamera) that will be in charge of getting new frames.\nResults that picamera uses the standard thread library, so I need to disable the monkey patching and use the standard thread python module within the import of the Process.py, and still use the patched module withing the flask-socketio process. Is it that possible? Is it possible to use different thread module on different process?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":134,"Q_Id":52076159,"Users Score":0,"Answer":"The short answer is that yes, your main and sub-processes do not necessarily need to be both using eventlet. Nothing wrong with not using it in the sub-process, and in fact, if you are going to be communicating with hardware, using eventlet is almost always not going to work well.\nI think you can make things work in the way you are starting your sub-process, but in my opinion, you are going to have less challenges if you run these two processes separately, not one as a sub-process of the other. Your main process will be 100% eventlet with everything monkey patched, while your camera process will have absolutely no trace of eventlet in it. Communication between these two processes is done through any available IPC mechanism. You can use queues, sockets, etc. The camera process will start and go into a wait, for example, by watching a queue for jobs issued by the main process.\nHope this helps!","Q_Score":0,"Tags":"python-3.x,python-multiprocessing,flask-socketio","A_Id":52111937,"CreationDate":"2018-08-29T11:16:00.000","Title":"Combining Greenleets with Flask, and Standard Threads","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I would like to know how should i could manage to change the static files use by the saelor framework. I've tried to change the logo.svg but failed to do so.\nI'm still learning python program while using the saleor framework for e-commerce.\nThank you.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":183,"Q_Id":52079211,"Users Score":1,"Answer":"Here is how it should be done. You must put your logo in the saleor\/static\/images folder then change it in base.html file in footer and navbar section.","Q_Score":1,"Tags":"django,python-3.x,saleor","A_Id":52221713,"CreationDate":"2018-08-29T13:57:00.000","Title":"Cannot update svg file(s) for saleor framework + python + django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have given a download file url in parse method, what is the default location for that files and Is there any possibility to change that downloaded directory?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":162,"Q_Id":52082742,"Users Score":0,"Answer":"The response contents in parse(self, response) method are not files and are not stored on disk. The response is a python object and is stored in memory.  \nScrapy only downloads contents if HTTP_CACHE_ENABLED setting is set and it will cache all pages in <project_root>\/.scrapy directory.","Q_Score":0,"Tags":"python,scrapy","A_Id":52088635,"CreationDate":"2018-08-29T17:04:00.000","Title":"what is default downloaded path in scrapy?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is the primary purpose of using a virtual environment to control versions of various packages installed on your development machine?\nFor example, I am developing a webapp using Django. My assumption is that using a virtual environment like Pipenv will ensure I don't have any problems down the road if I update my Django or python versions on my computer, because the webapp project is isolated with it's own versions of Django and Python.\nAre there any other notable benefits to using Pipenv?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":443,"Q_Id":52101240,"Users Score":2,"Answer":"Another benefit of using Pipenv\/virtualenv is that it makes deploying multiple web apps on the same server a lot easier. Instead of installing the packages for a given web app globally on the server, the virtualenv can be managed by a non-privileged deployment process, all contained in that specific web app's deployment directory.","Q_Score":2,"Tags":"python,django,virtualenv,pipenv,python-venv","A_Id":52101319,"CreationDate":"2018-08-30T16:01:00.000","Title":"Purpose of using virtual environment","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to create a picture slideshow which will show all the png and jpg files of a folder using django.\nProblem is how do I open windows explorer through django and prompt user to choose a folder name to load images from. Once this is done, how do I read all image files from this folder? Can I store all image files from this folder inside a list and pass this list in template views through context?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":747,"Q_Id":52104316,"Users Score":0,"Answer":"This link \u201chttps:\/\/github.com\/csev\/dj4e-samples\/tree\/master\/pics\u201d\nshows how to store data into to database(sqlite is the database used here) using Django forms. But you cannot upload an entire folder at once, so you have to create a one to many model between display_id(This is just a field name in models you can name it anything you want) and pics. Now you can individually upload all pics in the folder to the same display _id and access all of them using this display_id. Also make sure to pass content_type for jpg and png separately while retrieving the pics.","Q_Score":0,"Tags":"python,django,file-read","A_Id":64512939,"CreationDate":"2018-08-30T19:43:00.000","Title":"Reading all the image files in a folder in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm wondering what is the best way to represent the models, because there are some fields in common and others that change according to the category.\nExample: Common fields: (title, author, content, photo, references)\nCategory and its specific fields:\nBiography (birth data, death data, occupation)\nCommemorative date (data, description)\nMusic (artist, album, year, musical style)\nThe best would be to create a generic model with common fields and others inherit from it (abstract models)?\nCreate a model for each category, ie repeating the common fields?\nCreate a single model with the common fields and have a category field that when selected would display the category-specific fields in django-admin? In that case, I suppose it would be done with jquery? Any references? There is nothing the material has on this on the internet.\nNote: All user interaction to register is in django-admin.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":26,"Q_Id":52116442,"Users Score":0,"Answer":"From the docs:\n\n\nOften, you will just want to use the parent class to hold information that you don\u2019t want to have to type out for each child\n  model. This class isn\u2019t going to ever be used in isolation, so\n  Abstract base classes are what you\u2019re after.\nIf you\u2019re subclassing an existing model (perhaps something from another application entirely) and want each model to have its own\n  database table, Multi-table inheritance is the way to go.\n\n\nSo if you don't want the parent class to have it's own table, abstract model is the way to go.","Q_Score":0,"Tags":"django,python-3.x,django-models","A_Id":52117141,"CreationDate":"2018-08-31T13:24:00.000","Title":"should I use abstract model in this situation?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to add alembic to an existing ,sqlalchemy using, project, with a working production db. I fail to find what's the standard way to do a \"zero\" migration == the migration setting up the db as it is now (For new developers setting up their environment) \nCurrently I've added import the declarative base class and all the models using it to the env.py , but first time alembic -c alembic.dev.ini revision  --autogenerate does create the existing tables. \nAnd I need to \"fake\" the migration on existing installations - using code. For django ORM I know how to make this work, but I fail to find what's the right way to do this with sqlalchemy\/alembic","AnswerCount":2,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":9086,"Q_Id":52121596,"Users Score":34,"Answer":"alembic revision --autogenerate inspects the state of the connected database and the state of the target metadata and then creates a migration that brings the database in line with metadata.\nIf you are introducing alembic\/sqlalchemy to an existing database, and you want a migration file that given an empty, fresh database would reproduce the current state- follow these steps.\n\nEnsure that your metadata is truly in line with your current database(i.e. ensure that running alembic revision --autogenerate creates a migration with zero operations).\n\nCreate a new temp_db that is empty and point your sqlalchemy.url in alembic.ini to this new temp_db.\n\nRun alembic revision --autogenerate. This will create your desired bulk migration that brings a fresh db in line with the current one.\n\nRemove temp_db and re-point sqlalchemy.url to your existing database.\n\nRun alembic stamp head. This tells sqlalchemy that the current migration represents the state of the database- so next time you run alembic upgrade head it will begin from this migration.","Q_Score":23,"Tags":"python,sqlalchemy,alembic","A_Id":56651578,"CreationDate":"2018-08-31T19:23:00.000","Title":"Creating \"zero state\" migration for existing db with sqlalchemy\/alembic and \"faking\" zero migration for that existing db","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to avoid having to requery and reprocess data for the cache every time the server reloads in development (pyramid framework).\nIs there an easy way to set up dogpile's memory backend, dogpile.cache.memory, so that its persistence is independent from my web server, or do I need a backend like redis or memcached for this?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":116,"Q_Id":52123387,"Users Score":1,"Answer":"Not really. It is a memory within the running python process. Once the application reloads, the process gets killed and re-started, the memory is gone. Using a file backend (like DBMBackend) might be a solution for you.\nOn the other hand, if you are on unix, installing and using memcached is easy.","Q_Score":0,"Tags":"python,pyramid,dogpile.cache","A_Id":52161127,"CreationDate":"2018-08-31T22:48:00.000","Title":"dogpile memory backend independent from web server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have written a code with django and celery, it is for a machine to run some tasks and to be accessible through net. So I need the django and celery to run automatically when the built-in PC starts. Can anyone please tell me the best and easiest way to do this? Can servers like Apache handle such thing?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":158,"Q_Id":52127601,"Users Score":0,"Answer":"Ok, if anyone has this problem, first I wrote a .sh file for each one and then call them in start up setting in ubuntu.","Q_Score":0,"Tags":"python,django,apache,celery","A_Id":52540500,"CreationDate":"2018-09-01T11:20:00.000","Title":"Celery + Django on startup","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am kinda newby in python thus the question. \nI am trying to create a simple http web server that can receive chunked data from a post request. \nI have realized later that once a request sends a headers with chunked data, the Content-length headers will be set to zero, thus reading the sent data with 'request.get_data()' will fail.\nIs there another way of reading the chunked data?\nThe request I receive does give me the data length in the 'X-Data-Length' headers.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":519,"Q_Id":52137499,"Users Score":0,"Answer":"Did you write both of the js upload file code and the flask in backend to handle upload request? If not then you will need some help with js to upload it.\nOne way to achieve chucked data upload is:\n\nChucked that file in the frontend with js. Give it some headers in the request for the total size, number of the chunk, chunk size... and send each chuck in a separate POST request (You can use dropzone.js for example, they will do the job for you, just need to config the params) \nIn the backend, create an upload API which will read the request headers and merge the file chunks back together","Q_Score":0,"Tags":"python-2.7,flask","A_Id":52137640,"CreationDate":"2018-09-02T13:29:00.000","Title":"Flask unable to receive chunked data","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on an application in Django where there is a feature which lets  the user share a download link to a public file. The server downloads the file and processes the information within. This can be a time taking task therefore I want to send periodic feedbacks to the user before operations has completed. For instances, I would like to inform the user that file has downloaded successfully or if some information was missing from one of the record e.t.c.\nI was thinking that after the client app has sent the upload request, I could get client app to periodically ask the server about the status. But I don't know how can I track the progress a different request.How can I implement this?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":201,"Q_Id":52138904,"Users Score":0,"Answer":"At first the progress task information can be saved in rdb or redis\u3002\nYou can return the id of the task when uses submit the request to start task and the task can be executed in the background context\u3002\nThe background task can save the task progress info in the db which you selected.\nThe app client get the progress info by the task id which the backend returned and the backend get the progress info from the db and push it in the response.\nThe  interval of the request can be defined by yourself.","Q_Score":0,"Tags":"python,django,sockets,http","A_Id":52143574,"CreationDate":"2018-09-02T16:24:00.000","Title":"Django send progress back to client before request has ended","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an tensorflow model that I'm planning to deploy using tensorflow serving for model inference. \nJust wondering if there is a way to add some custom logic after the service receives the request and before it goes to the tensorflow model. Specifically, I need a lookup step from an external database, that would enrich the data the application receives through the REST call. \nAlternatively, is that possible as part of the tensorflow graph?\nIt sounds like an overkill to create a separate service just for that, if it can be bundled in the serving layer.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":57,"Q_Id":52153548,"Users Score":0,"Answer":"I'd say that you could wrap the TF server in something like a flask app, which takes in a REST request, applies the additional logic (the DB lookup), and populates and sends a request to the TF server (either via HTTP or gRPC). I don't think it would be possible to do it as 'part of the TF graph'.","Q_Score":0,"Tags":"python,tensorflow,tensorflow-serving","A_Id":52182820,"CreationDate":"2018-09-03T16:33:00.000","Title":"External database lookup in TF serving or part of the TF graph","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have some code on my mac in the latest version of python idle 3, that collects certain data from a csv file that gets sent to myself and prints out the output in the terminal. I want to create a webpage that has a button or link that a user clicks and it runs the code and prints out the output of my program.\nEventually i want to be able to create a website with multiple links that can do the same operation.\nWill i need to create an sql database? If so how?...","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":876,"Q_Id":52156530,"Users Score":0,"Answer":"From the sound of it, you want to use a webpage as a user interface for your python script. Unfortunately without utilising a server-side language this is not possible.\nMultiple options exist for reacting to a button press on the server side, with PHP being the most well known, but solutions using only python do exist, such as Flask.\nIf you're just after a local GUI for your script, simpler options exist within python such as Tk.","Q_Score":0,"Tags":"html,database,python-3.x,web","A_Id":52156697,"CreationDate":"2018-09-03T21:54:00.000","Title":"How to run a python script when a hyperlink is clicked from a webpage?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have been trying to configure the prerender.io middleware for my angularjs app hosted on google app engine with webapp2 framework, but none of the options for installing the middleware token seem applicable. \nCan anyone be kind enough to assist me? Thank you.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":55,"Q_Id":52158087,"Users Score":0,"Answer":"If Google doesn't allow you to modify the server to install one of the middleware options, are you using a CDN? A CDN might allow you to set up the Prerender.io middleware on their platform. Feel free to email us at support@prerender.io","Q_Score":0,"Tags":"angularjs,webapp2,google-app-engine-python,prerender","A_Id":52167749,"CreationDate":"2018-09-04T02:38:00.000","Title":"How do I configure prerender.io to work on webapp2 for my angularjs app?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I've used the following line of code to make my browser log a user out of the Django admin when the browser is closed\nSESSION_EXPIRE_AT_BROWSER_CLOSE setting to true\nHow do I change this and make it in such a way that when the user closes the tab, The user gets logged out?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":942,"Q_Id":52158770,"Users Score":3,"Answer":"Absolutely nothing to do with Django. It is more related to how browsers treat a cookie.\nWhat happens is that if a cookie doesn't have an expiration date (Expires attribute) or Max-Age, browsers treat them as session cookies. That means a browser will delete that cookie when you exit your browser session i.e. when you close your browser.\nAnd since closing a tab isn't equal to exiting your browser, browsers don't delete a session cookie.\n\n\n\nUPDATE: If someone really needs to log the user out on tab close, it can be achieved, well, sort of.\nYou can set the session cookie's age to a small number, maybe 10 minutes. While the user has the tab opened, every 10 minutes, you refresh the cookie (i.e. make an AJAX requests to get a new cookie).\nWhen the user closes the tab, their session will automatically expire within next 10 minutes.\nIt's a little complicated setup, but I've seen it implemented on banking sites etc. It's up to you to decide if it's worth it for your site or not.","Q_Score":2,"Tags":"python,django","A_Id":52159330,"CreationDate":"2018-09-04T04:21:00.000","Title":"Django: Auto logout when Tab is closed (Not browser)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am learning the Django framework.\nI have two groups of users: manager and employees.\nAt the login page, I want to differentiate between these two groups.\nIf the employee has logged in, then redirect it to the homepage, and if the manager logged in, redirect it to the '\/manage' page.\nHow should I do this in Django?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":211,"Q_Id":52164812,"Users Score":0,"Answer":"Just check the user group in you login view :)","Q_Score":0,"Tags":"python,django,web","A_Id":52164993,"CreationDate":"2018-09-04T11:01:00.000","Title":"Differentiate Users in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My project architecture is in this way .. I have a django-rest-api (api) in a django project and normal django app with TemplateView's , In django app templates I use both django template tags and angularJs tags and I differentiate them using {% verbaitm %} tag. I want to know the best way to show loading page .  \nNOTE :I have an issue in here , I load both angularJS Tags and Django Template tags in my project so i am not able to hide django template tags here, and show loading screen.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":51,"Q_Id":52166468,"Users Score":0,"Answer":"It's probably not worth making\/loading an entire page for this. If you are waiting on an ajax call response, before you send the request you could pop some sort of loading overlay with the same Javascript you are creating the AJAX request with. Once you receive the response, use the success method to take down your loading \noverlay.","Q_Score":0,"Tags":"javascript,python,angularjs,django,django-rest-framework","A_Id":52168082,"CreationDate":"2018-09-04T12:33:00.000","Title":"How add a html template as loading screen in AngularJS untill http response is recieved?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I would like to model two processes:\n(1) A simple real-time message broadcaster (deterministic) and\n(2) Another process which receives data externally in real-time (from a Redis db) and then compares its own message to the value of the last message broadcast by (1)\nI have been playing around with Simpy and thought this could be done by creating two parallel environment instances and getting one to peer into the state of the other. Is this possible?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":324,"Q_Id":52176053,"Users Score":0,"Answer":"If both process exchange data, they must run within the same environment.  Since SimPy processes run asynchronously, this is no problem.","Q_Score":1,"Tags":"python,redis,simpy","A_Id":52179073,"CreationDate":"2018-09-05T01:57:00.000","Title":"Can I run two Simpy environments in parallel","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Just have a small doubt, I am building a small application in python which will use firebase database and storage, I am reading too much about firebase admin sdk, What is the basic difference between normal firebase services and firebase admin sdk or is it one and the same, also if i am starting development now is using firebase admin sdk recommended...?\nAlso i will integrate the database and storage to my android application.","AnswerCount":3,"Available Count":2,"Score":0.1973753202,"is_accepted":false,"ViewCount":2026,"Q_Id":52190544,"Users Score":3,"Answer":"If you're writing code with python and you want to access Firebase and Cloud serivces, the recommended option is to use the admin SDK.  It's designed to be the easiest way to read and write data in your database, upload and download files to your Cloud Storage buckets, and perform other administrative functions, such as authenticated user management.\nI'm not sure what you mean by \"normal Firebase services\".","Q_Score":4,"Tags":"python,python-3.x,firebase,firebase-realtime-database,google-cloud-firestore","A_Id":52190585,"CreationDate":"2018-09-05T17:26:00.000","Title":"Difference between normal firebase and firebase admin sdk","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Just have a small doubt, I am building a small application in python which will use firebase database and storage, I am reading too much about firebase admin sdk, What is the basic difference between normal firebase services and firebase admin sdk or is it one and the same, also if i am starting development now is using firebase admin sdk recommended...?\nAlso i will integrate the database and storage to my android application.","AnswerCount":3,"Available Count":2,"Score":0.0665680765,"is_accepted":false,"ViewCount":2026,"Q_Id":52190544,"Users Score":1,"Answer":"Python Firebase admin SDK: If you use Firebase Admin SDK then you can have admin access to things without worrying about restrictions and rules on your database.\nPython Firebase: If you use python firebase (normal firebase) then you need to authenticate each time you access your data (Means you can set rules and permissions for your document)","Q_Score":4,"Tags":"python,python-3.x,firebase,firebase-realtime-database,google-cloud-firestore","A_Id":60914916,"CreationDate":"2018-09-05T17:26:00.000","Title":"Difference between normal firebase and firebase admin sdk","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So far I have investigated two different ways of persistently tracking player attribute skills in a game. These are mainly conceptual except for the threading option I came up with \/ found an example for.\nThe case:\nSolo developing a web game. Geo political simulator but with a little twist in comparison to others out there which I won't reveal.\nI'm using a combination of Flask and SQLAlchemy for which I have written routes for and have templates extending into a base dynamically. \nCurrently running it in dev mode locally with the intention of putting it behind a WSGI and a reverse proxy like Nginx on the cloud based Linux vm.\nAbout the player attribute mechanics - a player will submit a post request which will specify a few bits of information. First we want to know which skill, intelligence, endurance etc. Next wee need to know which player, but all of this will be generated automatically, we can use Flask-LoginManager to get the current user with our nifty user_loader decorator and function. We can use the user ID it provides to query the rest of it, namely what level the player is. We can specify the math used to decide the wait time increase later in seconds.\nThe options;\nOption 1:\nAs suggested by a colleague of mine. Allow the database to manage the timings of the skills. When the user submits the form, we will have created a new table to hold skill upgrade information. We take a note of what time the user submitted the form and also we multiply the current skill level by a factor of X amount of time and we put both pieces of data into the database. Then we create a new process that manages the constant checking of this table. Using timedelta, we can check if the amount of time that has elapsed since the form was submitted is equal to or greater than the time the player must wait until the upgrade is complete.\nOption 2:\nImport threading and create a class which expects the same information as abovr supplied on init and then simply use time.sleep for X amount of time then fire the upgrade and kill the thread when it's finished.\nI hope this all makes sense. I haven't written either yet because I am undecided about which is the most efficient way around it.\nI'm looking for the most scalable solution (even if it's not an option listed here) but one that is also as practical or an improvement on my concept of the skill tracking mechanic.\nI'm open to adding another lib to the package but I really would rather not.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":42,"Q_Id":52199075,"Users Score":0,"Answer":"I'll expand on my comment a little bit:\nIn terms of scaleability:\n\nWhat if the upgrade processes become very long? Hours or days?\nWhat if you have a lot of users\nWhat if people disconnect and reconnect to sessions at different times?\n\nHopefully it is clear you cannot ensure a robust process with option 2. Threading and waiting will put a continuous and potentially limiting load on a server and if a server fails all those threads likely to be lost.\nIn terms of robustness:\nOn the other hand if you record all of the information to a database you have the facility to cross check the states of any items and perform upgrade\/downgrade actions as deemed necessary by some form of task scheduler. This allows you to ensure that character states are always consistent with what you expect. And you only need one process to scan through the DB periodically and perform actions on all of the open rows flagged for an upgrade.\nYou could, if you wanted, also avoid a global task scheduler altogether. When a user performs an activity on the site a little task could run in the background (as a kind of decorator) that checks the upgrade status and if the time is right performs the DB activity, otherwise just passes. But a user would need to be actively in a session to make sure this happens, as opposed to the scheduled task above.","Q_Score":0,"Tags":"python,python-3.x,sqlite,flask-sqlalchemy,flask-login","A_Id":52216293,"CreationDate":"2018-09-06T07:50:00.000","Title":"Most efficient way of tracking player skill upgrades","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Jenkins to run a Flask app automatically from a Git branch.\nThe build works well, and it starts the Flask app on my server, except that when you run flask run, the command line stays active as long as the flask app runs.\nThus, the build never ends, and it ends up as an unstable build.\nHow can I get the flask app to run and get a Jenkins build success if it got the the * Running on http:\/\/0.0.0.0:5000\/ (Press CTRL+C to quit) message?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":852,"Q_Id":52207146,"Users Score":4,"Answer":"If you're running flask run in a bash script, adding & to the end (flask run &) will run the task in the background, allowing the bash script to continue. I think this will let your job finish and Jenkins can scan stdout for the message indicating success.\nEdit: Apparently overriding the build number export BUILD_ID=<whatever> is enough to stop Jenkins from killing the background process. I'd be wary of what you choose as <whatever>, if you choose an existing BUILD_ID, there could be side-effects.","Q_Score":2,"Tags":"python,jenkins,flask","A_Id":52207227,"CreationDate":"2018-09-06T15:07:00.000","Title":"Execute a flask run in Jenkins shell without timeout","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"We have a server application based on Python 3.6 running on Google Kubernetes Engine. I added Google StackDriver Debug to aid in debugging some production issues but I cannot get our app to show up in the Stackdriver debug console. The 'application to debug' dropdown menu stays empty.\nThe kubernetes cluster is provisioned with the cloud-debug scope and the app starts up correctly. Also, the Stackdriver Debugging API is enabled on our project. When running the app locally on my machine, cloud debugging works as expected, but I cannot find a reason why it won't work on our production environment","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":207,"Q_Id":52222605,"Users Score":1,"Answer":"In my case the problem was not with the scopes of the platform, but rather with the fact that you cannot simply pip install google-python-cloud-debugger on the official python-alpine docker images. Alpine Linux support is not tested regularly and my problem was related to missing symbols in the C-library. \nAlpine Linux uses the MUSL C-library and it needs a google cloud debugger specifically built for that library. After preparing a specific docker image for this, I got it to work with the provided credentials.","Q_Score":1,"Tags":"python-3.x,google-kubernetes-engine,stackdriver,google-cloud-stackdriver","A_Id":52337909,"CreationDate":"2018-09-07T12:29:00.000","Title":"Google stackdriver debug not working in Kubernetes","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a problem in my project in django (Django 1.8 - I know it is old) with photo uploading. The point is that this is too slow.\n\nWhat could be the reason?\nHow can I debug, measure how long it takes? This should be checked on the nginx side?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":29,"Q_Id":52223438,"Users Score":0,"Answer":"Body size (image size) could be huge and if you upload it without compression, it could take more time to send all data to handler.\nCreate decorator around handler that takes media uploads.","Q_Score":0,"Tags":"python,django,file-upload,upload,image-uploading","A_Id":52223461,"CreationDate":"2018-09-07T13:19:00.000","Title":"Debug, measure time image upload in django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm new to AWS. I created a test environments with AWS Cloud9, and a django project. When I start djangos dev server, is it possible to access it, from Cloud9 IDE preview or from the internet?\nthanx for your help in advance,\nstrophi","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":528,"Q_Id":52223496,"Users Score":0,"Answer":"You could use something like python manage.py runserver 0.0.0.0:8080 and then access from anywhere using the public IP, something like XXX.XXX.XXX.XXX:8080\n*Make sure the port is not blocked","Q_Score":0,"Tags":"python,django,amazon-web-services","A_Id":52226239,"CreationDate":"2018-09-07T13:23:00.000","Title":"How to access python django dev server started in AWS Cloud9","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I would like to run a test in Django but in order to run the test I need access to data from the production database (I don't want to setup an entirely new database for testing).\nHow can use this data from the production database without allowing write access in my script? I don't want this test to effect anything, but I need access to this data in order to run this test. It seems ridiculous to have to launch (and pay for) an entirely new database just to grab a few rows of data, any advice?","AnswerCount":3,"Available Count":2,"Score":-0.0665680765,"is_accepted":false,"ViewCount":2785,"Q_Id":52230750,"Users Score":-1,"Answer":"Don't do that. You must use the setUp of your test to construct your situation to test. Don't use fixtures also because you have to maintain them, in future you'll change your model and your fixtures must be updated too. This is very annoying.\nIf you do a good unit test you can mock your models and test the functions you want to test. I do that often when I want to test a method.\nIf you need you can create some utility function to help you setup the situation you need to create the models and related models to construct the env you want to test.","Q_Score":5,"Tags":"python,django,python-3.x,unit-testing","A_Id":52233824,"CreationDate":"2018-09-07T23:37:00.000","Title":"How do I run a test in Django using production data (Read only)?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I would like to run a test in Django but in order to run the test I need access to data from the production database (I don't want to setup an entirely new database for testing).\nHow can use this data from the production database without allowing write access in my script? I don't want this test to effect anything, but I need access to this data in order to run this test. It seems ridiculous to have to launch (and pay for) an entirely new database just to grab a few rows of data, any advice?","AnswerCount":3,"Available Count":2,"Score":0.0665680765,"is_accepted":false,"ViewCount":2785,"Q_Id":52230750,"Users Score":1,"Answer":"I agree with others that this is a bad idea for various reason. If you want to move forward with it anyway, set up a separate database user with read-only permissions. How you do this depends on the database server you are using.\nDouble check that you are actually using the credentials of the read-only user in your tests.","Q_Score":5,"Tags":"python,django,python-3.x,unit-testing","A_Id":52234788,"CreationDate":"2018-09-07T23:37:00.000","Title":"How do I run a test in Django using production data (Read only)?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I used django console email backend in development and It worked fine. Now for test I tried production with gunicorn and nginx, but I have no email backend for now so I used django console email backend again for sending emails, where can I see emails? is there any log to check them? or In production console backend wouldn't work?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":103,"Q_Id":52234988,"Users Score":0,"Answer":"The logs will be visible in the gunicorn logs, you need to configure the logfile in gunicon configuration.","Q_Score":0,"Tags":"python,django,gunicorn","A_Id":52236595,"CreationDate":"2018-09-08T11:45:00.000","Title":"Django console email backend in production with gunicorn and nginx","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I\u2019ve build a web based data dashboard that shows 4 graphs - each containing a large amount of data points.\nWhen the URL endpoint is visited Flask calls my python script that grabs the data from a sql server and then starts manipulating it and finally outputs the bokeh graphs. \nHowever, as these graphs get larger\/there becomes more graphs on the screen the website takes long to load - since the entire function has to run before something is displayed.\nHow would I go about lazy loading these? I.e. it loads the first (most important graph) and displays it while running the function for the other graphs, showing them as and when they finish running (showing a sort of loading bar where each of the graphs are or something).\nWould love some advice on how to implement this or similar.\nThanks!","AnswerCount":1,"Available Count":1,"Score":0.537049567,"is_accepted":false,"ViewCount":14269,"Q_Id":52238200,"Users Score":3,"Answer":"I had the same problem as you. The problem with any kind of flask render is that all data is processed and passed to the page (i.e. client) simultaneously, often at large time cost. Not only that, but the the server web process is quite heavily loaded.\nThe solution I was forced to implement as the comment suggested was to load the page with blank charts and then upon mounting them access a flask api (via JS ajax) that returns chart json data to the client. This permits lazy loading of charts, as well as allowing the data manipulation to possibly be performed on a worker and not web server.","Q_Score":9,"Tags":"python,flask,bokeh","A_Id":52238332,"CreationDate":"2018-09-08T18:25:00.000","Title":"Lazy loading with python and flask","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Selenium to scrape table data from a website. I found that I can easily iterate through the rows to get the information that I need using xcode. Does selenium keep hitting the website every time I search for an object's text by xcode? Or does it download the page first and then search through the objects offline?\nIf the former is true does is there a way to download the html and iterate offline using Selenium?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":43,"Q_Id":52249090,"Users Score":1,"Answer":"Selenium uses a Web Driver, similar to your web browser. Selenium will access\/download the web page once, unless you've wrote the code to reload the page.\nYou can download the web page and access it locally in selenium. For example you could get selenium to access the web page \"C:\\users\\public\\Desktop\\index.html\"","Q_Score":0,"Tags":"python,selenium","A_Id":52249127,"CreationDate":"2018-09-09T22:24:00.000","Title":"What happens when scraping items from a website table using Selenium?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am getting the polling data by running celery beat scheduler and periodic task. I like to share this data with the Django server. this data should available for the entire Django application server. is there anyway? and I don't want to share this data either DB or file. please suggest me to do this in a better way, thank you in advance.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":88,"Q_Id":52255926,"Users Score":1,"Answer":"Short answer : what you ask for is not possible, period. \nLonger answer : given that a django production setup will run more than one Django process (yes, even with one single server), there's no such thing as \"THE\" django server and the only way to \"share data\" from celery workers to the django processes is to store them in \"something\" that is 1\/ available to all the workers and all the django processes and 2\/ supports concurrent access - IOW in a database server process of some sort (your SQL db for persistant data, Redis for transiant data).","Q_Score":0,"Tags":"python,django,celery,periodic-task,djcelery","A_Id":52256244,"CreationDate":"2018-09-10T10:35:00.000","Title":"get djcelery periodic task data inside the django app and keep the data in the entire application without store in file and db?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want advice on how to do the following:\nOn the same server, I want to have two apps. One WordPress app and one Python app. At the same time, I want the root of my domain to be a static landing page.\nUrl structure I want to achieve:\n\nexample.com\/   => static landing page\nexample.com\/tickets => wordpress\nexample.com\/pythonapp => python app\n\nI have never done something like this before and searching for solutions didn't help.\nIs it even possible? \nIs it better to use subdomains?\nIs it better to use different servers?\nHow should I approach this?\nThanks in advance!","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":112,"Q_Id":52257055,"Users Score":1,"Answer":"It depends on the webserver you want to use. Let's go with apache as it is one of the most used web servers on the internet.\n\nYou install your wordpress installation into the \/tickets subdirectory and install word-press as you normally would. This should install wordpress into the subdirectory.\nConfigure your Python-WSGI App with this configuration:\n\nWSGIScriptAlias \/pythonapp \/var\/www\/path\/to\/my\/wsgi.py","Q_Score":0,"Tags":"python,wordpress,url,routes,url-routing","A_Id":52257207,"CreationDate":"2018-09-10T11:43:00.000","Title":"one server, same domain, different apps (example.com\/ & example.com\/tickets )?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm new to Django. Curious to note that every \"view\" function has a request as the first parameter, but when I look for request object in the documentation, I got HttpRequest instead... \nAre they the same? \nIf so, why bother to give two names for the same object?","AnswerCount":2,"Available Count":1,"Score":0.4621171573,"is_accepted":false,"ViewCount":646,"Q_Id":52258156,"Users Score":5,"Answer":"Are they the same?\n  If so, why bother to give two names for the same object?\n\nHttpRequest is a class, the request parameter to views is an instance of this class (well, it's expected to be at least).","Q_Score":2,"Tags":"python,django","A_Id":52258400,"CreationDate":"2018-09-10T12:46:00.000","Title":"Django HttpRequest vs. Request","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I know how to save model results to .txt files and saving plots to .png. I also found some post which shows how to save multiple plots on a single pdf file. What I am looking for is generating a single pdf file which can contain both model results\/summary and it's related plots. So at the end I can have something like auto generated model report. Can someone suggest me how I can do this?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":109,"Q_Id":52286538,"Users Score":0,"Answer":"I\u2019ve had good results with the fpdf module. It should do everything you need it to do and the learning curve isn\u2019t bad. You can install with pip install fpdf.","Q_Score":0,"Tags":"python,plot,model,report","A_Id":52286569,"CreationDate":"2018-09-12T02:15:00.000","Title":"How to saving plots and model results to pdf in python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to add InPadding to my LabelFrame i'm using AppJar GUI. I try this:\nself.app.setLabelFrameInPadding(self.name(\"_content\"), [20, 20])\nBut i get this error:\n\nappJar:WARNING [Line 12->3063\/configureWidget]: Error configuring _content: unknown option \"-ipadx\"\n\nAny ideas how to fix it?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":112,"Q_Id":52289125,"Users Score":0,"Answer":"Because of the way containers are implemented in appJar, padding works slightly differently for labelFrames.\nTry calling: app.setLabelFramePadding('name', [20,20])","Q_Score":0,"Tags":"python-3.x,user-interface","A_Id":52907153,"CreationDate":"2018-09-12T06:55:00.000","Title":"Error configuring: unknown option \"-ipadx\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a django project hosted on an amazon ec2 linux instance.\nFor run my app also when section is close i use gunicorn but i experience some errors and degradation in perfonrmances.\nWhen i run command:\n\npython manage.py runserver\n\nfrom terminal all works great but when section is close app does not work.\nHow can i run command \"python manage.py runserver\" for work forever (until i'll kill it) in background also in case of closed session?\nI know there is uWSGI but i prefer if possible use directly django native command.\nThanks in advance","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1909,"Q_Id":52289325,"Users Score":0,"Answer":"for that, you can use screen just start a new screen and run\npython manage.py runserver","Q_Score":2,"Tags":"python,django,nginx,gunicorn,django-manage.py","A_Id":52289569,"CreationDate":"2018-09-12T07:06:00.000","Title":"Django use 'python manage.py' runserver instead Gunicorn","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to deploy same flask application as two different instances lets say sandbox instance and testing instance on the same iis server and same machine. having two folders with different configurations (one for testing and one for sandbox) IIS runs whichever is requested first. for example I want to deploy one under www.example.com\/test and the other under www.example.com\/sandbox. if I requested www.example.com\/test first then this app keeps working correctly but whenever I request www.example.com\/sandbox it returns 404 and vice versa! \nquestion bottom line: \n\nhow can I make both apps run under the same domain with such URLs?\nwould using app factory pattern solve this issue?\nwhat blocks both apps from running side by side as I am trying to do?\n\nthanks a lot in advance","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":218,"Q_Id":52295946,"Users Score":0,"Answer":"been stuck for a week before asking this question and the neatest way I found was to assign each app a different app pool and now they are working together side by side happily ever after.","Q_Score":0,"Tags":"flask,iis-7.5,python-3.6","A_Id":52297680,"CreationDate":"2018-09-12T13:04:00.000","Title":"Two flask Apps same domain IIS","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I initially started a small python project (Python, Tkinter amd PonyORM) and became larger that is why I decided to divide the code (used to be single file only) to several modules (e.g. main, form1, entity, database). Main acting as the main controller, form1 as an example can contain a tkinter Frame which can be used as an interface where the user can input data, entity contains the db.Enttiy mappings and database for the pony.Database instance along with its connection details. I think problem is that during import, I'm getting this error \"pony.orm.core.ERDiagramError: Cannot define entity 'EmpInfo': database mapping has already been generated\".  Can you point me to any existing code how should be done.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":588,"Q_Id":52308096,"Users Score":0,"Answer":"Probably you import your modules in a wrong order. Any module which contains entity definitions should be imported before db.generate_mapping() call.\nI think you should call db.generate_mapping() right before entering tk.mainloop() when all imports are already done.","Q_Score":2,"Tags":"python,ponyorm","A_Id":52330119,"CreationDate":"2018-09-13T06:51:00.000","Title":"Sharing PonyORM's db session across different python module","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am looking for a way to set up a Lambda trigger, where if any files are uploaded into the S3 bucket, the trigger will push\/copy the file(s) to the SFTP server.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1207,"Q_Id":52316168,"Users Score":0,"Answer":"You have to use the following algorithm: \n\nLog in to AWS console,\nLambda service,\nCreate a new lambda function (choose a proper runtime);\n\nThen you have to set a trigger (a left pane). If you want to trigger your lambda by s3 bucket then click on s3. \nThen you have to configure your trigger (choose your bucket and trigger action). \nAfter you complete all of this steps it's a time to write a handler file.\nDo not forget that every single trigger has to be in the same region as lambda.","Q_Score":0,"Tags":"python,amazon-web-services,amazon-s3,aws-lambda","A_Id":52323243,"CreationDate":"2018-09-13T14:42:00.000","Title":"Is there a Lambda trigger that will push\/copy files from S3 bucket to the SFTP server?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created and REST API using Flask-RESTPlus. I am getting response in json and its fine. Now I have a new requirement to specify Response content type as csv or json. \nI checked API doc there is nothing mentioned !!\nIs it possible to get reponse in csv using Flask-RESTPlus ??","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":586,"Q_Id":52325100,"Users Score":2,"Answer":"I was able to get output in csv . It took some time though\n\n@api.representation('text\/csv')\ndef data_csv(data, code, headers):\n    '''Get result in csv '''\n    resp = make_response(convert_data(data), code)\n    resp.headers.extend(headers)\n    return resp","Q_Score":1,"Tags":"python,csv,flask-restplus","A_Id":52396235,"CreationDate":"2018-09-14T04:43:00.000","Title":"Get response from Flask-RESTPlus in csv","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How can I make a relationship between two APIs, where an application is in node.js with the mongodb and another in python with mysql, I need to make a relation between them of 1: N between client:sales, in one I have the register client (name, cpf) and the other part is a sale, but for me to carry out the sales I need customer data.\nIn a traditional application this relationship would be through a foreign key, as we are talking about two separate applications how could this relationship be made ??","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":189,"Q_Id":52327099,"Users Score":0,"Answer":"You maintain relation via you services. All you have with you is two services, Client Service and sale service. \nClient service ideally should have no information about sales service, it should not know even if the sale service or any other service even exist.\nHowever for you to record sale you need to do it against client, and in that case sales service can keep client id and can pull information from client when needed.\nIt is upto sale service to decide what relation ship is, it can allow for one client to have multiple sales record or one. Service can decide that, This might not exactly be required to be embedded into database by means of FK.\nSales service can keep all the information related to sales alongside an id (Just like you would have in traditional database). Based on database choices you can put constraint against this id if you have to.","Q_Score":0,"Tags":"python,node.js,api,microservices","A_Id":52327376,"CreationDate":"2018-09-14T07:35:00.000","Title":"Relationship between two microservices with different database by means of api rest","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have configured my robot project with Jenkins on the windows machine.Provided commands in execute windows batch commands = robot -d robot_result --variable profile:NR Tests\\Suite\\Module\nIn the module folder, I have all the robot test cases. hence, provided the path of test cases.\nBut when I trigger build in jenkins I get below error \n[ ERROR ] Parsing 'Tests\\Suite\\Module\\' failed: Data source does not exist.\nWhile same test cases are working file in Eclipse and command line with above-mentioned command. I am using python interpreter to execute test cases in windows machine.\nCan someone please provide input?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1321,"Q_Id":52328413,"Users Score":0,"Answer":"This error means that you are doing something like \"robot foo.robot\", but \"foo.robot\" doesn't exist. Either you have a typo in the filename, or you're making assumptions about the cwd that aren't true, or the file literally doesn't exist.","Q_Score":0,"Tags":"python-3.x,jenkins,jenkins-pipeline,robotframework","A_Id":52332295,"CreationDate":"2018-09-14T08:57:00.000","Title":"Got \"failed: Data source does not exist\" when running robot test cases via Jenkins","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I've been working on scrapy for 3 months. for extracting selectors I use simple response.css or response.xpath..\nI'm asked to switch to ItemLoaders and use add_xpath add_css etc.\nI know how ItemLoaders work and ho convinient they are but can anyone compare these 2 w.r.t efficiency? which way is efficient and why ??","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":191,"Q_Id":52330140,"Users Score":0,"Answer":"Item loaders do exactly the same thing underneath that you do when you don't use them. So for every loader.add_css\/add_xpath call there will be responce.css\/xpath executed. It won't be any faster and the little amount of additional work they do won't really make things any slower (especially in comparison to xml parsing and network\/io load).","Q_Score":1,"Tags":"python,python-3.x,scrapy,css-selectors","A_Id":52332084,"CreationDate":"2018-09-14T10:30:00.000","Title":"Scrapy: Difference between simple spider and the one with ItemLoader","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In Lua with Torch, you use \"th\" to run a Lua script. In Python, you use either \"python\" or \"python3\" to run a python script. In Java, you use \"java\" to run a java class script. \nWhat is this word in front the commands, actually called? I tried to search for the name myself, but I couldn't find anything.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":527,"Q_Id":52349926,"Users Score":6,"Answer":"It's just a shell command. Not any different from cd or grep, etc.\nIn the case of Python, the python command invokes the Python interpreter, starting either an interactive session, or, if a file is specified, running the file through the interpreter. But it just tells the shell something to do.","Q_Score":1,"Tags":"java,python,lua,torch","A_Id":52349940,"CreationDate":"2018-09-16T00:20:00.000","Title":"What is the \"th\", \"python\", \"python3\", \"java\", etc... used in front a command to run a script, called?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is there a way to get Celery to allocate tasks to workers based on available RAM? I am developing a web app which applies memory hungry algorithms to large in-memory data, is there a way to make this more robust using Celery to respect available RAM?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":170,"Q_Id":52359174,"Users Score":0,"Answer":"Allocating tasks to workers based on available RAM is not possible. But, depending on your setup and exact requirements there are ways to work address this problem. Off the top of my head I can think of:\n\nyou run one worker (and nothing else) on a machine with loads of RAM\nand have this worker process these memory-hungry tasks only\nif you know how much memory you need for processing a task, you could\ncheck if that memory is available as a first step in your task\n(assuming that not much else runs on that box which could use up that\nmemory in between the check and the actual running of your\nmemory-hungry stuff) and if not, you can retry the task after a\ncertain time","Q_Score":0,"Tags":"python,python-3.x,celery,task-queue","A_Id":52362117,"CreationDate":"2018-09-16T23:18:00.000","Title":"Scheduling tasks with python\/celery\/any other task queue based on available RAM","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"While I am using django_select2, the field_id parameter is not getting passed to get URL select2\/fields\/auto.json.\nDue to this, it throws 404 error.\nIs there any configuration I am missing?\npython3.6, \ndjango2.1 and \ndjango_select2 LIB_VERSION = v4.0.5\ndjango_select2-6.3.1.dist-info\nAll are latest versions only.\nI am not sure where is the problem but I can see that GET URL select2\/fields\/auto.json is called without field_id. When I manually execute it with field_id with the key generated, I am getting the proper results.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":734,"Q_Id":52383968,"Users Score":0,"Answer":"Here is the maintainer of django-select2. Saldy we no longer maintain version 4. This is a really old version and in version 5 we did a complete rewrite. That solved a lot of issues. Maybe this one too. I highly suggest to update to the latest version. Especially if you are using Django 2.1 and Python 3.6.","Q_Score":1,"Tags":"django,python-3.x,jquery-select2,django-select-related","A_Id":52393895,"CreationDate":"2018-09-18T10:00:00.000","Title":"In django_select2, the field_id parameter is getting not passed in ajax url","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We have successfully executed the source data collection python program using App Engine Cron service in App Engine Flexible environment. \nNow, We are trying to execute the same python program in App Engine Standard Environment. But, We are getting the Error Can't connect to HTTPS URL because the SSL module is not available. \nAnyone came across this Error ? I have given full access to App Engine default service account for the Bucket. Please help to resolve this issue.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":38,"Q_Id":52384913,"Users Score":0,"Answer":"Managed to resolve this error.\nWe need to add the below libraries in the app.yaml\nlibraries:\n - name: ssl\n   version: latest","Q_Score":0,"Tags":"google-app-engine,google-app-engine-python,app-engine-flexible","A_Id":52455730,"CreationDate":"2018-09-18T10:50:00.000","Title":"Python program working fine in App Engine Standard Environment. But we get SSL error when we schedule it in App Engine Flexible Environment","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am using Odoo 10 and I cant figure out how to stop a custom float field rounding.\nHere is my field box = fields.Float(\"Yards Per Box\")\nIn Odoo if I put 1.196 into the field it auto rounds to 1.20 how can I stop this on  a custom Float field?","AnswerCount":3,"Available Count":1,"Score":-0.0665680765,"is_accepted":false,"ViewCount":5182,"Q_Id":52388694,"Users Score":-1,"Answer":"Try this,\nbox = fields.Float(\"Yards Per Box\", digits=3)\nif you want to add 3 digit precision...","Q_Score":0,"Tags":"python,odoo,odoo-10,odoo-9,odoo-11","A_Id":52398540,"CreationDate":"2018-09-18T14:20:00.000","Title":"Odoo Float field Rounding","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a conceptual question about doing test driven development with Django, may also apply to other frameworks as well.\nTDD states that the firts step in the development cycle is to write failing tests. \nSuppose for a unit test, I want to verify that an item is actually created when a request arrives. To test this functioanlty, I want to issue a request with the test client, and check with the db that this object is actully created. To be able to do that, I need to import the related model in the test file, but as the first step is writing this test, I don't even have a model yet. So I won't be able to run the tests to see them fail.\nWhat is the suggested approach here? Maybe write a simpler test first, then modify the test after enough level of production code is implemented?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":321,"Q_Id":52389183,"Users Score":0,"Answer":"In Django, the approach is always to recreate a working environment for testing and staging. In testing the data is fake, in staging the data is \"old\" or very similar to the production.","Q_Score":2,"Tags":"python,django,testing,tdd","A_Id":52389672,"CreationDate":"2018-09-18T14:44:00.000","Title":"Test Driven Development with Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I see the same error many people have seen. \n\ndjango.db.migrations.exceptions.InconsistentMigrationHistory: Migration message.0001_initial is applied before its dependency users.0001_initial on database 'default'.\n\nSeems like the cause is because I'm using CustomUser model (using django-allauth).\nI already delete all the migration folders and sqlite3 and tried some ways other people answered. But I cannot avoid this error. \nSeems like I was successful in avoiding this error (I have no idea how I did.)\nAnd because the migration files still remains on my gitHub, I saw them and all the files look the same as the ones I created before.  I'm wondering if I can ignore this error and waring. If not, what is the way to avoid this error?\nwhat I did\nusing --fake when doing migrations\nhiding django.admin when doing migrations\napplying zero\nall things failed.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":975,"Q_Id":52389718,"Users Score":0,"Answer":"I actually solved the problem.\nWhat I did is applying migration into the app CustomUser model is located, and then applying migration into other apps. And then I did python manage.py migrate.\nOther orders doesn't work for me.","Q_Score":0,"Tags":"python,django","A_Id":52389903,"CreationDate":"2018-09-18T15:12:00.000","Title":"Django; Is it possible to ignore this error? django.db.migrations.exceptions.InconsistentMigrationHistory:","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am building a web-app. One part of the app calls a function that starts a tweepy StreamListener on certain track. That functions process a tweet and then it writes a json object to a file or mongodb.\nOn the other hand I need a process that is reading the file or mongodb and paginates the tweet if some property is in it. The thing is that I don't know how to do that second part. Do I need different threads?\nWhat solutions could there be?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":29,"Q_Id":52391071,"Users Score":0,"Answer":"You can certainly do it with a thread or spinning up a new process that will perform the pagination.\nAlternatively you can look into a task queue service (Redis queue, celery, as examples). Your web-app can add a task to this queue and your other program can listen to this queue and perform the pagination tasks as they come in.","Q_Score":0,"Tags":"python,flask,tweepy","A_Id":52396308,"CreationDate":"2018-09-18T16:35:00.000","Title":"Do I need two instances of python-flask?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need Twitter tweet button below every blog post.\nHow do I make {% pageurl %} return an absolute URL of that specific blog post?\nThanks","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":510,"Q_Id":52405554,"Users Score":1,"Answer":"Instead of {% pageurl my_page %}, use {{ my_page.full_url }}.","Q_Score":0,"Tags":"python,django,wagtail","A_Id":52406374,"CreationDate":"2018-09-19T12:09:00.000","Title":"How to make pageurl return an absolute url","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want my flask APP to pull updates from a local txt file every 200ms, is it possible to do that?\nP.S. I've considered BackgroundScheduler() from apschedulerler, but the granularity of is 1s.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":610,"Q_Id":52415384,"Users Score":1,"Answer":"Couldn't you just start a loop in a thread that sleeps for 200 ms before the next iteration?","Q_Score":0,"Tags":"python,python-3.x,flask,apscheduler","A_Id":52419167,"CreationDate":"2018-09-19T23:16:00.000","Title":"how to run periodic task in high frequency in flask?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Python script that calculates a few, quite small, NumPy arrays and I have a Java service on a separate machine that needs to use these arrays. \nThese arrays sometimes need to be recalculated and then used afterwards by the Java service. What is the best way to dump a NumPy array to the disk and load it in Java as float[][]? \nI know that I could use JSON to do this (Python script dumps the NumPy array to a JSON file and Java service recovers float[][] from this), but is there any other, \"preferred\" way?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":57,"Q_Id":52421822,"Users Score":1,"Answer":"Saving a file to disk to exchange the data between different applications sounds like a hacky approach to me. \nDepending on your structure and complexity, I would consider implementing a messaging queue (i.e. redis) or a document database (i.e. mongo or prefered alternative) with respective clients to do the data exchange between the apps.\nOn the data structure itself, I would choose json or csv for the task. If you need human readability or strict structure, json is your tool. If the data is meant only for the machine to read, csv takes less space to store the same amount of data.","Q_Score":0,"Tags":"java,python,arrays","A_Id":52422031,"CreationDate":"2018-09-20T09:29:00.000","Title":"Move array of doubles from Python to Java","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I deployed python app successfully but when I open the app it is showing me:\nApplication error\nAn error occurred in the application and your page could not be served. If you are the application owner, check your logs for details. You can do this from the Heroku CLI with the command\nHeroku logs --tail\nhere is my heroku logs:\n\nservice= status=503 bytes= protocol=https\n  2018-09-20T10:05:18.000000+00:00 app[api]: Build succeeded\n  2018-09-20T10:19:34.769300+00:00 heroku[router]: at=error code=H14\n  desc=\"No web processes running\" method=GET path=\"\/\"\n  host=demoaap.herokuapp.com request_id=1ae\n  01895-963b-4211-9b30-d16de606c827 fwd=\"182.72.121.210\" dyno= connect=\n  service= s tatus=503 bytes= protocol=https\n\n\"heroku ps\"commands gives:\nNo dynos on demoaap (demoaap is my app name)\nmoreover i have tried Herokuommand( \" heroku ps:scale web=1\" ) in order to run dynos but not working\n.\nPlease help me out","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":558,"Q_Id":52423143,"Users Score":0,"Answer":"web: gunicorn --worker-class eventlet -w 1 app:app","Q_Score":0,"Tags":"python,heroku,procfile","A_Id":53710702,"CreationDate":"2018-09-20T10:35:00.000","Title":"Python Heroku app has 0 web dynos despite right Procfile and at right location","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I deployed python app successfully but when I open the app it is showing me:\nApplication error\nAn error occurred in the application and your page could not be served. If you are the application owner, check your logs for details. You can do this from the Heroku CLI with the command\nHeroku logs --tail\nhere is my heroku logs:\n\nservice= status=503 bytes= protocol=https\n  2018-09-20T10:05:18.000000+00:00 app[api]: Build succeeded\n  2018-09-20T10:19:34.769300+00:00 heroku[router]: at=error code=H14\n  desc=\"No web processes running\" method=GET path=\"\/\"\n  host=demoaap.herokuapp.com request_id=1ae\n  01895-963b-4211-9b30-d16de606c827 fwd=\"182.72.121.210\" dyno= connect=\n  service= s tatus=503 bytes= protocol=https\n\n\"heroku ps\"commands gives:\nNo dynos on demoaap (demoaap is my app name)\nmoreover i have tried Herokuommand( \" heroku ps:scale web=1\" ) in order to run dynos but not working\n.\nPlease help me out","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":558,"Q_Id":52423143,"Users Score":1,"Answer":"If you used a Procfile in deployment, make sure it does not have an extension such as .txt.  If it does, you might try:\n\nDeleting that Procfile.txt.\nCreating a new Procfile without the extension.\nPushing the new files to Heroku.","Q_Score":0,"Tags":"python,heroku,procfile","A_Id":56436037,"CreationDate":"2018-09-20T10:35:00.000","Title":"Python Heroku app has 0 web dynos despite right Procfile and at right location","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm studying Python for 4\/5 months and this is my third project built from scratch, but im not able to solve this problem on my own.\nThis script downloads 1 image for each url given.\nIm not able to find a solution on how to implement Thread Pool Executor or async in this script. I cannot figure out how to link the url with the image number to the save image part. \nI build a dict of all the urls that i need to download but how do I actually save the image with the correct name?\nAny other advise?\nPS. The urls present at the moment are only fake one.\nSynchronous version:\n\n\n    import requests\n    import argparse\n    import re\n    import os\n    import logging\n\n    from bs4 import BeautifulSoup\n\n\n    parser = argparse.ArgumentParser()\n    parser.add_argument(\"-n\", \"--num\", help=\"Book number\", type=int, required=True) \n    parser.add_argument(\"-p\", dest=r\"path_name\", default=r\"F:\\Users\\123\", help=\"Save to dir\", )\n    args = parser.parse_args()\n\n\n\n    logging.basicConfig(format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',\n                        level=logging.ERROR)\n    logger = logging.getLogger(__name__)  \n\n\n    def get_parser(url_c):  \n        url = f'https:\/\/test.net\/g\/{url_c}\/1'\n        logger.info(f'Main url: {url_c}')\n        responce = requests.get(url, timeout=5) # timeout will raise an exeption\n        if responce.status_code == 200:\n            page = requests.get(url, timeout=5).content\n            soup = BeautifulSoup(page, 'html.parser')\n            return soup\n        else:\n            responce.raise_for_status()\n\n\n    def get_locators(soup): # take get_parser\n        # Extract first\/last page num\n        first = int(soup.select_one('span.current').string)\n        logger.info(f'First page: {first}')\n        last = int(soup.select_one('span.num-pages').string) + 1\n\n        # Extract img_code and extension\n        link = soup.find('img', {'class': 'fit-horizontal'}).attrs[\"src\"]\n        logger.info(f'Locator code: {link}')\n        code = re.search('galleries.([0-9]+)\\\/.\\.(\\w{3})', link)\n        book_code = code.group(1)   # internal code \n        extension = code.group(2)   # png or jpg\n\n        # extract Dir book name\n        pattern = re.compile('pretty\":\"(.*)\"')\n        found = soup.find('script', text=pattern)\n        string = pattern.search(found.text).group(1)\n        dir_name = string.split('\"')[0]\n        logger.info(f'Dir name: {dir_name}')\n\n        logger.info(f'Hidden code: {book_code}')\n        print(f'Extension: {extension}')\n        print(f'Tot pages: {last}')\n        print(f'')\n\n        return {'first_p': first, \n                'last_p': last, \n                'book_code': book_code, \n                'ext': extension, \n                'dir': dir_name\n                }\n\n\n    def setup_download_dir(path, dir):  # (args.path_name, locator['dir'])\n        # Make folder if it not exist\n        filepath = os.path.join(f'{path}\\{dir}')\n        if not os.path.exists(filepath):\n            try:\n                os.makedirs(filepath)\n                print(f'Directory created at: {filepath}')\n            except OSError as err:\n                print(f\"Can't create {filepath}: {err}\")    \n         return filepath \n\n\n    def main(locator, filepath):\n        for image_n in range(locator['first_p'], locator['last_p']):\n            url = f\"https:\/\/i.test.net\/galleries\/{locator['book_code']}\/{image_n}.{locator['ext']}\"\n            logger.info(f'Url Img: {url}')\n            responce = requests.get(url, timeout=3)\n            if responce.status_code == 200:\n                img_data = requests.get(url, timeout=3).content \n            else:    \n                responce.raise_for_status()    # raise exepetion \n\n            with open((os.path.join(filepath, f\"{image_n}.{locator['ext']}\")), 'wb') as handler:\n                handler.write(img_data) # write image\n                print(f'Img {image_n} - DONE')\n\n\n    if __name__ == '__main__':\n        try:\n            locator = get_locators(get_parser(args.num))    # args.num ex. 241461\n            main(locator, setup_download_dir(args.path_name, locator['dir'])) \n        except KeyboardInterrupt:\n            print(f'Program aborted...' + '\\n')\n\n\nUrls list:\n\n\n    def img_links(locator):\n        image_url = []\n        for num in range(locator['first_p'], locator['last_p']):\n            url = f\"https:\/\/i.test.net\/galleries\/{locator['book_code']}\/{num}.{locator['ext']}\"\n            image_url.append(url)\n        logger.info(f'Url List: {image_url}')       \n        return image_url","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":353,"Q_Id":52430038,"Users Score":0,"Answer":"I found the solution in the book fluent python. Here the snippet:\n\n    def download_many(cc_list, base_url, verbose, concur_req):\n        counter = collections.Counter()\n        with futures.ThreadPoolExecutor(max_workers=concur_req) as executor:\n            to_do_map = {}\n            for cc in sorted(cc_list):\n                future = executor.submit(download_one, cc, base_url, verbose)\n                to_do_map[future] = cc\n            done_iter = futures.as_completed(to_do_map)\n            if not verbose:\n                done_iter = tqdm.tqdm(done_iter, total=len(cc_list))\n            for future in done_iter:\n                try:\n                    res = future.result()\n                except requests.exceptions.HTTPError as exc:\n                    error_msg = 'HTTP {res.status_code} - {res.reason}'\n                    error_msg = error_msg.format(res=exc.response)\n                except requests.exceptions.ConnectionError as exc:\n                    error_msg = 'Connection error'\n                else:\n                    error_msg = ''\n                    status = res.status\n                if error_msg:\n                    status = HTTPStatus.error\n                counter[status] += 1\n                if verbose and error_msg:\n                    cc = to_do_map[future]\n                    print('*** Error for {}: {}'.format(cc, error_msg))\n        return counter","Q_Score":2,"Tags":"python,python-3.x,asynchronous,python-multithreading,imagedownload","A_Id":52735044,"CreationDate":"2018-09-20T17:05:00.000","Title":"python asyncronous images download (multiple urls)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I created a RESTful application in Python. I'm now trying to know what kind of server I should use to deploy the application. Currently I'm looking at Gunicorn, which is a WSGI server. But I often hear about this popular web-server Apache as well. \nSo my questions are:\n\nWhat is the difference between the WSGI and web-server?\nIf I don't need a public domain (i.e. my application only needs to\nrun within the private network), should I use WSGI or a web-server?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":698,"Q_Id":52448861,"Users Score":-1,"Answer":"WSGI is the standard interface for running Python web server applications. Python frameworks already implement this standard so you don't need to worry about this. There is no point in using apache if your application is written in Python.","Q_Score":0,"Tags":"python,apache,webserver,gunicorn,wsgi","A_Id":52464604,"CreationDate":"2018-09-21T17:54:00.000","Title":"What is the difference between a WSGI server and a Web server?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Him I am trying to set up my first django project. I have never done Django before so I don't know anything about it. I am trying to follow the official Django tutorial page, it tells me to open views.py. I can't find it anywhere in my \"mysite\" folder. In it, I have manage.py , db.sqlite3, __init__.py, settings.py, urls.py and wsgi.py along with the pycache folder, but no signs of views.py. Can anyone help me?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1417,"Q_Id":52455894,"Users Score":2,"Answer":"Running this command in console django-admin startproject myfirstproject will create a new django project for you, which will have another sub-folder named same as your project name. By default on creating a new project, the views.py file isn't created you have to create it manually in your project sub-folder. \nTo create a new app, Run django-admin startapp myapp which will create a new sub-folder under your parent directory which will have views.py where you can write your own custom views for your HTML templates","Q_Score":0,"Tags":"python,django,python-3.x,django-views,python-3.7","A_Id":52455984,"CreationDate":"2018-09-22T10:44:00.000","Title":"Where is \"views.py\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a pretty simple setup. I'm running Pycharm 2018.2.3 and using docker compose to spin up 3 containers.\n\nMy Django application\nNGINX to serve static\nPostgres DB\n\nI've configured the remote interpreter for debugging the container, and break point work just fine in most cases, at least when I hit my API endpoints or some other action to the django application.\nWhat does not work, is when I run one of my manage custom manage.py custom commands. I've tried this 2 ways so far.\n\nI setup another debug configuration in PyCharm to execute the command. This results in another container spinning up (in place of the original. Running the command, without breaking on any line breaks. Then the whole container shuts down.\nI've logged into the container, run the manage.py command directly via the command line, and it execute in the container, but again no breakpoints.\n\nThe documentation seems to work in the normal case, but I can't find any help for debugging these commands in the container.\nThanks for any help or tips.","AnswerCount":3,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1342,"Q_Id":52462866,"Users Score":1,"Answer":"Just an update in case anybody comes across a similar problem. My personal solution was to not use the manage.py commands, but instead make these same commands available via an http call.\nI found that it was easier (and often even more useful) to simply have an endpoint like myserver.com\/api\/do-admin-function and restrict that to administrative access.\nWhen I put a breakpoint in my code, even running in the container, it breaks just fine as expected and allows me to debug the way I'd like","Q_Score":5,"Tags":"python,django,docker,pycharm,remote-debugging","A_Id":54485770,"CreationDate":"2018-09-23T03:59:00.000","Title":"Pycharm debugging manage.py commands in docker compose","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"From long time i am having migration issues. Each time i am droping my postgres database and creating a new When i add new 3\/4 table or a relation or Circular migration happens. Or most of the time some unwanted issue comes in migration. \nBut it's okay as long i am in development phase. But very soon when it will be on production i can't do that. Removing database each time.\nI have heard a lot about django-south. But the issue is it's not updated from long time i think last time it was updated December,14(according to it's bitbucket repo). \nNow is it a good choice for a project of 2018 ? Or any other 3rd party i can use. I just don't want to take rick writing raw sql each time in production as i am not too good on it as well. So i want to depend on django 100% in migration. \nPlease share you ideas on the migration issue\nThanks in advance :)","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":76,"Q_Id":52465655,"Users Score":3,"Answer":"South was the predecessor of django migrate. It became a part of Django core, so no need to install it.\nIf you are having migration issues, you should learn how to fix them, instead of just re-installing. You can edit every single migration file. They are just regular .py files with regular Django functions that do the necessary changes to your tables.\nRead the error message, try to understand what went wrong, and fix the migration file that caused the error. They are numbered and located in projectfolder\/appfolder\/migrations\/.\nI am using migrate all the time and never had an issue that wasn't fixable.","Q_Score":1,"Tags":"python,django,django-models,django-south,django-migrations","A_Id":52465934,"CreationDate":"2018-09-23T11:29:00.000","Title":"Is it safe to use Django south for handling migration on big project","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I upload my first Django-project into DigitalOcean. After command python manage.py loaddata initial_data.json, I have received this message:\n\ndjango.db.utils.IntegrityError: Problem installing fixture\n  '\/webapps\/django_shop\/shop\/initial_data.json': Could not load\n  contenttypes.ContentType(pk=3): duplicate key value violates unique\n  constraint \"django_content_type_app_label_76bd3d3b_uniq\" DETAIL:  Key\n  (app_label, model)=(auth, permission) already exists.\n\nHow can I fix it?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1910,"Q_Id":52467768,"Users Score":2,"Answer":"It looks like you've generated fixtures that include Django's default data set, i.e. the built-in entries that are inserted normally as part of the first migrate run for some of Django's plumbing data types.\nYou should review your fixture process, because content type entries will be created automatically when your (and Django's) apps' migrations are run, so they should not be present in fixtures. It's possible there are other tables that will have this same problem, so now would be a good time to make sure you're not including any other data that would result in this situation.","Q_Score":0,"Tags":"python,django","A_Id":52490378,"CreationDate":"2018-09-23T15:50:00.000","Title":"IntegrityError: Problem installing fixture","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have two django REST API projects which I have decoupled them into micro services architecture, one of the services is an (SSO) that handles authentication (I'm using JWT token based authentication) and manage Users info and the other is a payroll service.\nThe problem is the user has a relation to some model in payroll service. To be specific I have an Employee class in payroll service which has a user_id field. This is where I will add a user UUID which I will get from querying the SSO service.\nHow do I share database across micro-services taking into consideration each service has its own database.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1538,"Q_Id":52475303,"Users Score":4,"Answer":"Sharing database across bounded contexts is not advisable as each microservice should have the capability to make changes on how it persist data. \nAllowing multiple microservices to manage databases would lead you to a death star pitfall pattern\nHowever, you might want to send a copy\/updates of user data on the authentication context towards your payroll service. In this way, you can\nhave independent data persistence strategies. One way to do this is to implement event emission strategy on your authentication context,\nthis event emission strategy would be in-charge of broadcasting data changes made on the authentication context that subscribers residing from\nanother bounded context can listen so that they can store a copy of your user data on their own persistence layers.","Q_Score":4,"Tags":"python,django,database,django-rest-framework,microservices","A_Id":52490138,"CreationDate":"2018-09-24T08:28:00.000","Title":"Sharing database relations across micro-services with Django rest framework","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So I'm making a school project and I have to make a python server and android client. So I've already created a server using websockets with python 3 (I'm not using Flask or socket.io and etc, just regular websockets) and a client in android studio. I ran everything locally and it works great! \nSo now I want to go up in a level a little bit, I want to host my server on Heroku. I tried but I have some problems with that... As I mentioned, I'm using only websockets and not Flask and that means that I need to specify a host ip\/url and a port. But when I host the server on Heroku it says that \"address already in use\".\nDoes anyone know how solve it?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1539,"Q_Id":52477103,"Users Score":5,"Answer":"You can host in heroku by using the ip \"0.0.0.0\", and get the port from the env variable called \"PORT\". On the client you can connect to the websocket server using \"wss:\/\/yourherokuapp.herokuapp.com\/0.0.0.0\". Make sure on your Procfile your script is running as a web process type.","Q_Score":5,"Tags":"python,heroku,websocket","A_Id":54756879,"CreationDate":"2018-09-24T10:14:00.000","Title":"How to host websocket app python server on Heroku without Flask?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I got this error while running the Django app file that I had downloaded from GitHub. How can I solve this problem?","AnswerCount":8,"Available Count":5,"Score":0.024994793,"is_accepted":false,"ViewCount":41924,"Q_Id":52477683,"Users Score":1,"Answer":"Rename the class name or file name that you are importing, this fixed my issue.","Q_Score":40,"Tags":"python,django","A_Id":69743708,"CreationDate":"2018-09-24T10:49:00.000","Title":"ImportError: bad magic number in 'time': b'\\x03\\xf3\\r\\n' in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I got this error while running the Django app file that I had downloaded from GitHub. How can I solve this problem?","AnswerCount":8,"Available Count":5,"Score":0.1243530018,"is_accepted":false,"ViewCount":41924,"Q_Id":52477683,"Users Score":5,"Answer":"Delete the .pyc files created in your directory .'\nex : i have gitlab.py and gitlab.pyc\nlater i renamed it into gitlab-api.py\nBut while running python file , it is using gitlab.pyc so\n\nTraceback (most recent call last):\nFile \"gitlab-api.py\", line 1, in \nimport gitlab\nImportError: bad magic number in 'gitlab': b'\\x03\\xf3\\r\\n'\n\nit worked correctly when i deleted the gitlab.pyc","Q_Score":40,"Tags":"python,django","A_Id":56897908,"CreationDate":"2018-09-24T10:49:00.000","Title":"ImportError: bad magic number in 'time': b'\\x03\\xf3\\r\\n' in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I got this error while running the Django app file that I had downloaded from GitHub. How can I solve this problem?","AnswerCount":8,"Available Count":5,"Score":1.0,"is_accepted":false,"ViewCount":41924,"Q_Id":52477683,"Users Score":23,"Answer":"Finally, I found the answer, The project has .pyc files, which holds the previous version information and time date, so this error. After deleting those files I got the output.","Q_Score":40,"Tags":"python,django","A_Id":52477805,"CreationDate":"2018-09-24T10:49:00.000","Title":"ImportError: bad magic number in 'time': b'\\x03\\xf3\\r\\n' in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I got this error while running the Django app file that I had downloaded from GitHub. How can I solve this problem?","AnswerCount":8,"Available Count":5,"Score":0.049958375,"is_accepted":false,"ViewCount":41924,"Q_Id":52477683,"Users Score":2,"Answer":"If your OS is Windows you have to delete Python's older versions, then you are ready to use pip again. This is the best method, without errors.","Q_Score":40,"Tags":"python,django","A_Id":61260929,"CreationDate":"2018-09-24T10:49:00.000","Title":"ImportError: bad magic number in 'time': b'\\x03\\xf3\\r\\n' in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I got this error while running the Django app file that I had downloaded from GitHub. How can I solve this problem?","AnswerCount":8,"Available Count":5,"Score":0.0996679946,"is_accepted":false,"ViewCount":41924,"Q_Id":52477683,"Users Score":4,"Answer":"you will need to delete any pyc. pyc is the cache of your app. delete all files that end with .pyc and rerun your app.","Q_Score":40,"Tags":"python,django","A_Id":57879128,"CreationDate":"2018-09-24T10:49:00.000","Title":"ImportError: bad magic number in 'time': b'\\x03\\xf3\\r\\n' in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"so I'm new to python and trying to set up an Apache server to use with django. I already set up django and set the Apache directory and installed C++ version 14.0, but now I'm encountering the following error when trying to install mod_wsgi:\nerror: command 'C:\\Program Files (x86)\\Microsoft Visual Studio\\2017\\BuildTools\\VC\\Tools\\MSVC\\14.15.26726\\bin\\HostX86\\x86\\link.exe' failed with exit status 1120\nI can't find anything useful on how to fix this error and install mod_wsgi, so any help would be appreciated. I am using python 3.7.0 and using Windows 10. I will edit this post with more info about my setup if needed.\nThanks in advance.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":545,"Q_Id":52478149,"Users Score":0,"Answer":"I had this issue because my Apache installation on Windows was 32Bit. Everything else was 64Bit\nI installed XAMPP and it worked in the end.","Q_Score":0,"Tags":"python,apache,pip,mod-wsgi","A_Id":69136486,"CreationDate":"2018-09-24T11:16:00.000","Title":"Encountering exit status 1120 when trying to install mod_wsgi using pip","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a data set which contains site usage behavior of users over a period of six months. It contains data about:\n\nNumber of pages viewed \nNumber of unique cookies associated with each user\nDifferent number of OS, Browsers used \nDifferent number of cities visited\n\nEverything over here is collected on a six month time frame. I have used this data to train a model to predict a target variable 'y'. Everything is numeric in format.\nNow I know since its a six month data, and the model is built upon this 6 months of data, I can use this to predict on the next six month data to get target variable y.\nMy question is that if instead of using it to predict on six month time frame, I use the model to predict on monthly time frame, will it give me incorrect results?\nMy logic tells me yes, as for example, I used tree method such as Decision tree and Random forest, these algorithms kind of makes thresholds to give output \"0\/1\". Now the variables I mentioned above such as number of cookies associated, OS, Browser etc would have different values if we look at it from  one month stand point and if we look at it from 6 months standpoint. For example, number of unique cookies associated with a user would be less if seen over a month where as it will be more if seen from 6 months standpoint. \nBut I am confused as to if the model will automatically adjust these values while running on monthly data or not. Request you to help me understand the if I am thinking this right or wrong. Also please provide logical explanation if possible. \nThanks.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":421,"Q_Id":52487832,"Users Score":0,"Answer":"Is your minimum unit of mesurement 6 months ? I hope not, but if yes, then I would sugges that you dont try to predict the next 1 month.\nSeasonality within a year aside, you would need daily volume measurements.. I would be very worried to build anything on monthly or even weekly numbers.\nIn terms of modelling techniques, please stick to simple regression methods like kungphu suggests.","Q_Score":0,"Tags":"python,machine-learning,logic,data-science,prediction","A_Id":52604844,"CreationDate":"2018-09-24T21:49:00.000","Title":"Prediction problem- Build model using 6 months data and predict on one month data?","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Hello everyone i'm trying to set up virtualenv and virtualenvwrapper on MAC OS and made huge research  tried everything what i can. DOESN't Work.\nI had python 2.7, i installed python 3.7 using regular installer from the python website.\nInstalled everything what i need but getting error:\n\n\/usr\/bin\/python: No module named virtualenvwrapper\n  virtualenvwrapper.sh: There was a problem running the initialization\n  hooks.\nIf Python could not import the module virtualenvwrapper.hook_loader,\n  check that virtualenvwrapper has been installed for\n  VIRTUALENVWRAPPER_PYTHON=\/usr\/bin\/python and that PATH is set\n  properly.\n\nHere is my ~\/.bashrc :\n\nexport WORKON_HOME=$HOME\/.virtualenvs export PROJECT_HOME=$HOME\/code\n  export VIRTUALENVWRAPPER_PYTHON=\/usr\/local\/bin\/python export\n  VIRTUALENVWRAPPER_VIRTUALENV=\/usr\/local\/bin\/virtualenv export\n  VIRTUALENVWRAPPER_VIRTUALENV_ARGS='--no-site-packages'\nsource \/Library\/Frameworks\/Python.framework\/Versions\/3.7\/bin\/virtualenvwrapper.sh\n\nHere is where my python3 is installed \n\n\/Library\/Frameworks\/Python.framework\/Versions\/3.7\/bin\/python3\n\nSo in the end i did create one using \n\nvirtualenv -p python3 \"desired-path\"\n\nbut when i tried to set up everything with Django nothing is working bc of problem above. Any help please!!","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":727,"Q_Id":52491152,"Users Score":0,"Answer":"About 6 hours and i have a way to solve it so if anyone has the same problem just go ahead and change your ~\/.bashrc (by typing in Terminal nano ~\/.bashrc) to:\n\nexport WORKON_HOME=$HOME\/.virtualenvs export PROJECT_HOME=$HOME\/code\nexport\n  VIRTUALENVWRAPPER_PYTHON=\/Library\/Frameworks\/Python.framework\/Versions\/3.7\/bin\/python3.7\nexport VIRTUALENVWRAPPER_VIRTUALENV=\/Library\/Frameworks\/Python.framework\/Versions\/3.7\/bin\/virtualenv\nexport VIRTUALENVWRAPPER_VIRTUALENV_ARGS='--no-site-packages' source\n  \/Library\/Frameworks\/Python.framework\/Versions\/3.7\/bin\/virtualenvwrapper.sh","Q_Score":1,"Tags":"python-3.x,macos,virtualenv,virtualenvwrapper","A_Id":52498179,"CreationDate":"2018-09-25T05:28:00.000","Title":"Python virtualenv Can't set up! MAC OS","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"I downloaded Python 3.7 and am  running a script with \"from bs4 import BeautifulSoup\" and am receiving the following error on execution;\n\n\"File \"myscript.py\", line 3, in \n      from bs4 import BeautifulSoup ImportError: No module named bs4\"\n\nWhen I type \"pip3 install bs4\" or \"pip3 install BeautifulSoup4\" in the terminal I get the following;\n\n\"Requirement already satisfied: bs4 in\n  \/Library\/Frameworks\/Python.framework\/Versions\/3.7\/lib\/python3.7\/site-packages\n  (0.0.1) Requirement already satisfied: beautifulsoup4 in\n  \/Library\/Frameworks\/Python.framework\/Versions\/3.7\/lib\/python3.7\/site-packages\n  (from bs4) (4.6.3)\"\n\nExecuting \"import bs4\" and \"from bs4 import BeautifulSoup\" in IDLE don't error out.\nAny idea about what's going on?","AnswerCount":2,"Available Count":2,"Score":0.1973753202,"is_accepted":false,"ViewCount":1528,"Q_Id":52492315,"Users Score":2,"Answer":"Just pip install bs4. \nProbably, you are maintaining different versions of Python.","Q_Score":0,"Tags":"python,macos","A_Id":52492458,"CreationDate":"2018-09-25T06:57:00.000","Title":"ImportError: No module named bs4 - despite bs4 and BeautifulSoup being installed","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I downloaded Python 3.7 and am  running a script with \"from bs4 import BeautifulSoup\" and am receiving the following error on execution;\n\n\"File \"myscript.py\", line 3, in \n      from bs4 import BeautifulSoup ImportError: No module named bs4\"\n\nWhen I type \"pip3 install bs4\" or \"pip3 install BeautifulSoup4\" in the terminal I get the following;\n\n\"Requirement already satisfied: bs4 in\n  \/Library\/Frameworks\/Python.framework\/Versions\/3.7\/lib\/python3.7\/site-packages\n  (0.0.1) Requirement already satisfied: beautifulsoup4 in\n  \/Library\/Frameworks\/Python.framework\/Versions\/3.7\/lib\/python3.7\/site-packages\n  (from bs4) (4.6.3)\"\n\nExecuting \"import bs4\" and \"from bs4 import BeautifulSoup\" in IDLE don't error out.\nAny idea about what's going on?","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":1528,"Q_Id":52492315,"Users Score":1,"Answer":"check if you have more than one version of python, if so add the path of python 3.7 in the system setting and try removing the older python if possible\nand then pip install BeautifulSoup","Q_Score":0,"Tags":"python,macos","A_Id":56063007,"CreationDate":"2018-09-25T06:57:00.000","Title":"ImportError: No module named bs4 - despite bs4 and BeautifulSoup being installed","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm exploring ODL and mininet and able to run both and populate the network nodes over ODL and I can view the topology via ODL default webgui.\nI'm planning to create my own webgui and to start with simple topology view. I need advise and guideline on how I can achieve topology view on my own webgui. Plan to use python and html. Just a simple single page html and python script. Hopefully someone could lead me the way. Please assist and thank you.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":162,"Q_Id":52493515,"Users Score":0,"Answer":"If a web GUI for ODL would provide value for you, please consider working to contribute that upstream. The previous GUI (DLUX) has recently been deprecated because no one was supporting it, although it seems many people were using it.","Q_Score":0,"Tags":"python,html,api,web,opendaylight","A_Id":52532208,"CreationDate":"2018-09-25T08:12:00.000","Title":"How to view Opendaylight topology on external webgui","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How to integrate tesseract OCR in a web page such that:\n\nUser selects the file via system dialogue box actioned by a button (input type, file). \nThe uploaded image is then subjected to Tesseract script and the output of the OCR is displayed on the webpage itself.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":505,"Q_Id":52502008,"Users Score":1,"Answer":"There is a huge hidden problem to running tesseract in a webpage.\npytesseract, the popular tesseract wrapper for Python, calls on subprocess and Popen to run tesseract from the command line, then parses the results and returns them to you.\nSpawning a subprocess from a web request (other than those directly managed by your webserver) will:\n\nCrash or stall most Python web frameworks\nCrash or stall WSGI processes\nCreate tons of zombie processes\nBe a general pain to handle\n\nSo, my advice is to not.\nLook for an OCR solution that runs in pure-Python or interfaces with Python through a statically compiled shared object.\nWhich OCR solution does that... I have no clue.","Q_Score":0,"Tags":"python,html,webpage,tesseract","A_Id":52502112,"CreationDate":"2018-09-25T15:39:00.000","Title":"Integration of Tesseract OCR in a webpage - and more","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using \"django-pyodbc-azure\" 3rd party library for making connection and django1.11 and python version 3.5.2\n\n*** Error in `\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python': double free or corruption (!prev): 0x00007f7f08078a90 ***\n======= Backtrace: =========\n\/lib\/x86_64-linux-gnu\/libc.so.6(+0x777e5)[0x7f7f2a7a17e5]\n\/lib\/x86_64-linux-gnu\/libc.so.6(+0x8037a)[0x7f7f2a7aa37a]\n\/lib\/x86_64-linux-gnu\/libc.so.6(cfree+0x4c)[0x7f7f2a7ae53c]\n\/usr\/lib\/x86_64-linux-gnu\/libodbc.so.2(SQLDriverConnectW+0x9a0)[0x7f7f24055100]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/lib\/python3.5\/site-packages\/pyodbc.cpython-35m-x86_64-linux-gnu.so(_Z14Connection_NewP7_objectbblbS0_R6Object+0x2c3)[0x7f7f242a52a3]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/lib\/python3.5\/site-packages\/pyodbc.cpython-35m-x86_64-linux-gnu.so(+0x111de)[0x7f7f242a21de]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyCFunction_Call+0x77)[0x4e9ba7]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyEval_EvalFrameEx+0x59f5)[0x53c6d5]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyEval_EvalFrameEx+0x4b04)[0x53b7e4]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyEval_EvalFrameEx+0x4b04)[0x53b7e4]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyEval_EvalFrameEx+0x4b04)[0x53b7e4]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python[0x540199]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyEval_EvalFrameEx+0x50b2)[0x53bd92]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyEval_EvalFrameEx+0x4b04)[0x53b7e4]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python[0x5434af]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyCFunction_Call+0x4f)[0x4e9b7f]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyEval_EvalFrameEx+0x614)[0x5372f4]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyEval_EvalCodeEx+0x13b)[0x540f9b]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python[0x4ebd23]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyObject_Call+0x47)[0x5c1797]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python[0x4fb9ce]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyObject_Call+0x47)[0x5c1797]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyObject_CallFunctionObjArgs+0x128)[0x5c1988]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyEval_EvalFrameEx+0x20bc)[0x538d9c]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyEval_EvalFrameEx+0x4b04)[0x53b7e4]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyEval_EvalCodeEx+0x13b)[0x540f9b]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python[0x4ebd98]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyObject_Call+0x47)[0x5c1797]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyObject_CallFunctionObjArgs+0x128)[0x5c1988]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(_PyObject_GenericGetAttrWithDict+0x1bd)[0x593b9d]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyEval_EvalFrameEx+0x44d)[0x53712d]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python[0x540199]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyEval_EvalFrameEx+0x50b2)[0x53bd92]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python[0x540199]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyEval_EvalFrameEx+0x50b2)[0x53bd92]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python[0x4ed3f5]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python[0x5b7994]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python[0x5b7fbc]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python[0x57f03c]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyObject_Call+0x47)[0x5c1797]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyEval_EvalFrameEx+0x4ec6)[0x53bba6]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyEval_EvalFrameEx+0x4b04)[0x53b7e4]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyEval_EvalCodeEx+0x13b)[0x540f9b]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python[0x4ebd23]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyObject_Call+0x47)[0x5c1797]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python[0x4fb9ce]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyObject_Call+0x47)[0x5c1797]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python[0x584716]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python[0x5761aa]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python[0x54320c]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyEval_EvalFrameEx+0x4ce6)[0x53b9c6]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyEval_EvalCodeEx+0x13b)[0x540f9b]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python[0x4ebe37]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyObject_Call+0x47)[0x5c1797]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyEval_EvalFrameEx+0x252b)[0x53920b]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python[0x5406df]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyEval_EvalFrameEx+0x54f0)[0x53c1d0]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyEval_EvalCodeEx+0x13b)[0x540f9b]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python[0x4ebe37]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyObject_Call+0x47)[0x5c1797]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyEval_EvalFrameEx+0x252b)[0x53920b]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python(PyEval_EvalCodeEx+0x13b)[0x540f9b]\n\/home\/ubuntu\/GET-Services_mssql\/env_mssql\/bin\/python[0x4ebe37]","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":141,"Q_Id":52511704,"Users Score":0,"Answer":"My comment to the question apparently solved the problem:\n\nPython 3.5.2 and unixODBC 2.3.1 sounds like Ubuntu 16.04. Some packages in the Ubuntu repositories can be very old, e.g., unixODBC 2.3.1 is almost 7 years old now. Since it is unixODBC that is crashing (in SQLDriverConnectW) you might want to try upgrading it to the latest version (currently 2.3.7).","Q_Score":1,"Tags":"python,sql-server,django,ubuntu,pyodbc","A_Id":52669412,"CreationDate":"2018-09-26T06:56:00.000","Title":"Any Solution to SQLDriverConnect Error in Django Occurred Below using pyodbc","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"What is the BeautifulSoup method for retrieving text from an element. I haveprices = soup.find_all('p', class_='price_color') and want to retrieve the text from prices. I tried p = prices.get_text() but got an error stating: 'ResultSet' object has no attribute 'text'","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":36,"Q_Id":52529065,"Users Score":2,"Answer":"find_all returns a ResultSet object and you can iterate that object using a for loop.\nYou can try something such as:\nfor values in soup.find_all('p', class_='price_color'):\n    print values.text","Q_Score":0,"Tags":"python,text,beautifulsoup","A_Id":52529129,"CreationDate":"2018-09-27T03:37:00.000","Title":"BeautifulSoup method to retrieve the text from an element","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"while running my .....python manage.py\n\nTraceback (most recent call last):   File \"manage.py\", line 10, in\n  \n      execute_from_command_line(sys.argv)   File \"\/home\/devbase\/env\/local\/lib\/python2.7\/site-packages\/django\/core\/management\/init.py\",\n  line 364, in execute_from_command_line\n      utility.execute()   File \"\/home\/devbase\/env\/local\/lib\/python2.7\/site-packages\/django\/core\/management\/init.py\",\n  line 338, in execute\n      django.setup()   File \"\/home\/devbase\/env\/local\/lib\/python2.7\/site-packages\/django\/init.py\",\n  line 27, in setup\n      apps.populate(settings.INSTALLED_APPS)   File \"\/home\/devbase\/env\/local\/lib\/python2.7\/site-packages\/django\/apps\/registry.py\",\n  line 85, in populate\n      app_config = AppConfig.create(entry)   File \"\/home\/devbase\/env\/local\/lib\/python2.7\/site-packages\/django\/apps\/config.py\",\n  line 94, in create\n      module = import_module(entry)   File \"\/usr\/lib\/python2.7\/importlib\/init.py\", line 37, in import_module\n      import(name) ImportError: No module named djorm_pgtrgm","AnswerCount":3,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":800,"Q_Id":52534235,"Users Score":0,"Answer":"Try to make sure that django is installed for the right version of python (it seems you're running python 2, check if you only installed for pyhton 3, or the other way around)","Q_Score":0,"Tags":"python,django","A_Id":52534550,"CreationDate":"2018-09-27T09:53:00.000","Title":"Django Showing Error while running manage.py file","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"while running my .....python manage.py\n\nTraceback (most recent call last):   File \"manage.py\", line 10, in\n  \n      execute_from_command_line(sys.argv)   File \"\/home\/devbase\/env\/local\/lib\/python2.7\/site-packages\/django\/core\/management\/init.py\",\n  line 364, in execute_from_command_line\n      utility.execute()   File \"\/home\/devbase\/env\/local\/lib\/python2.7\/site-packages\/django\/core\/management\/init.py\",\n  line 338, in execute\n      django.setup()   File \"\/home\/devbase\/env\/local\/lib\/python2.7\/site-packages\/django\/init.py\",\n  line 27, in setup\n      apps.populate(settings.INSTALLED_APPS)   File \"\/home\/devbase\/env\/local\/lib\/python2.7\/site-packages\/django\/apps\/registry.py\",\n  line 85, in populate\n      app_config = AppConfig.create(entry)   File \"\/home\/devbase\/env\/local\/lib\/python2.7\/site-packages\/django\/apps\/config.py\",\n  line 94, in create\n      module = import_module(entry)   File \"\/usr\/lib\/python2.7\/importlib\/init.py\", line 37, in import_module\n      import(name) ImportError: No module named djorm_pgtrgm","AnswerCount":3,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":800,"Q_Id":52534235,"Users Score":0,"Answer":"Have you used the command python manage.py runserver","Q_Score":0,"Tags":"python,django","A_Id":60673640,"CreationDate":"2018-09-27T09:53:00.000","Title":"Django Showing Error while running manage.py file","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"while running my .....python manage.py\n\nTraceback (most recent call last):   File \"manage.py\", line 10, in\n  \n      execute_from_command_line(sys.argv)   File \"\/home\/devbase\/env\/local\/lib\/python2.7\/site-packages\/django\/core\/management\/init.py\",\n  line 364, in execute_from_command_line\n      utility.execute()   File \"\/home\/devbase\/env\/local\/lib\/python2.7\/site-packages\/django\/core\/management\/init.py\",\n  line 338, in execute\n      django.setup()   File \"\/home\/devbase\/env\/local\/lib\/python2.7\/site-packages\/django\/init.py\",\n  line 27, in setup\n      apps.populate(settings.INSTALLED_APPS)   File \"\/home\/devbase\/env\/local\/lib\/python2.7\/site-packages\/django\/apps\/registry.py\",\n  line 85, in populate\n      app_config = AppConfig.create(entry)   File \"\/home\/devbase\/env\/local\/lib\/python2.7\/site-packages\/django\/apps\/config.py\",\n  line 94, in create\n      module = import_module(entry)   File \"\/usr\/lib\/python2.7\/importlib\/init.py\", line 37, in import_module\n      import(name) ImportError: No module named djorm_pgtrgm","AnswerCount":3,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":800,"Q_Id":52534235,"Users Score":0,"Answer":"First check for clear installation of django. And fire correct query at correct path. Open your cmd , go to the path were you placed your manage.py file is. And then fire query python manage.py runserver.","Q_Score":0,"Tags":"python,django","A_Id":62067712,"CreationDate":"2018-09-27T09:53:00.000","Title":"Django Showing Error while running manage.py file","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Mezzanine blog under development, hosted at Heroku.\nWhile I have it on debug mode, by ensuring settings.py has DEBUG = True, everything works like a charm.\nWhen I set it to false, any attempt to access admin gives me the generic error message. All other aspects of the site works fine, including blog posts I've made (with DEBUG = True) for testing.\nI'm looking for any of two forms of help:\n\nHow could I get better debugging information while having DEBUG =\nFalse in settings.py?\nAny hint or suggestion about what could be the problem.\n\nEdit: My static files are being served with White Noise, locally, without any problem.","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":39,"Q_Id":52535073,"Users Score":2,"Answer":"A couple of months late, but for posterity: I found the same issue with Mezzanine 4.3.1 on Heroku. Without delving under the hood of the Mezzanine source code, using version 4.2.3 works fine.","Q_Score":0,"Tags":"python,django,heroku,mezzanine","A_Id":54923381,"CreationDate":"2018-09-27T10:37:00.000","Title":"Mezzanine only loads admin pages on debug","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want Pipenv to make virtual environment in the same folder with my project (Django).\nI searched and found the PIPENV_VENV_IN_PROJECT option but I don't know where and how to use this.","AnswerCount":5,"Available Count":2,"Score":1.0,"is_accepted":false,"ViewCount":36278,"Q_Id":52540121,"Users Score":58,"Answer":"This maybe help someone else.. I find another easy way to solve this!\nJust make empty folder inside your project and name it .venv\nand pipenv will use this folder.","Q_Score":58,"Tags":"python,pipenv","A_Id":60234402,"CreationDate":"2018-09-27T15:09:00.000","Title":"Make Pipenv create the virtualenv in the same folder","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want Pipenv to make virtual environment in the same folder with my project (Django).\nI searched and found the PIPENV_VENV_IN_PROJECT option but I don't know where and how to use this.","AnswerCount":5,"Available Count":2,"Score":0.0798297691,"is_accepted":false,"ViewCount":36278,"Q_Id":52540121,"Users Score":2,"Answer":"For posterity's sake, if you find pipenv is not creating a virtual environment in the proper location, you may have an erroneous Pipfile somewhere, confusing the pipenv shell call - in which case I would delete it form path locations that are not explicitly linked to a repository.","Q_Score":58,"Tags":"python,pipenv","A_Id":68628989,"CreationDate":"2018-09-27T15:09:00.000","Title":"Make Pipenv create the virtualenv in the same folder","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm newbe of Sphinx,\nI tried to use html_theme = 'sphinx_rtd_theme' in conf.py\nbut I get message below when I run \"make html\" :\n\nsphinx_rtd_theme is no longer a hard dependency since version 1.4.0. Please install it manually.(pip install sphinx_rtd_theme)\n\nI already installed it with pip install sphinx_rtd_them \n(part of pip list)\n\nPackage                  Version \n\nalabaster                0.7.11 \n  sphinx-rtd-theme         0.4.1 \n  Sphinx                   1.8.1  \n\nAlso I installed sphinx-doc with brew.\nAnybody with same issue?? \nAnother things to know is...My ubuntu PC works perfectly,\n but not works on Macbook pro...","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":710,"Q_Id":52552081,"Users Score":1,"Answer":"Ok...WTF...I have no idea how it works,\nBut I ran \n\nbrew remove sphinx-doc\n\nand \"make html\" worked,\nIf anyone can answer why and how this happened, please let me know...","Q_Score":2,"Tags":"python,python-sphinx","A_Id":52552216,"CreationDate":"2018-09-28T09:17:00.000","Title":"sphinx not able to find sphinx_rtd_theme","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm trying to write my REST API in Django so that if someone makes a patch or post it will require someone with access to Django's admin panel to actually write the changes, but it'll be pending and visible to the admin till then, is this possible? Or do I have to create a model for the pending request then make the patch and post create new entities?","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":935,"Q_Id":52552838,"Users Score":0,"Answer":"You have to store the request user somewhere, several solutions:\n\nA new model in your database\nA new field is_validated on your model\nStore that in cache (not safe)","Q_Score":3,"Tags":"python,django,rest,django-rest-framework,admin","A_Id":52552913,"CreationDate":"2018-09-28T09:59:00.000","Title":"Django: Require admin approval for patch and post","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to write my REST API in Django so that if someone makes a patch or post it will require someone with access to Django's admin panel to actually write the changes, but it'll be pending and visible to the admin till then, is this possible? Or do I have to create a model for the pending request then make the patch and post create new entities?","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":935,"Q_Id":52552838,"Users Score":0,"Answer":"I agree with everything that @Zulu said in his answer (except using the cache, don't think that would be a great idea).\nI think your best bet would be (assuming I understand your overall goal) would be to create a model that stores the history of changes. From there, every change would be able to maintain state, and then your view\/viewset can simply pull from the data that was most recently validated. Hopefully that makes sense and can help you out overall.","Q_Score":3,"Tags":"python,django,rest,django-rest-framework,admin","A_Id":52555959,"CreationDate":"2018-09-28T09:59:00.000","Title":"Django: Require admin approval for patch and post","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working on a scraper project and one of the goals is to get every image link from HTML & CSS of a website. I was using BeautifulSoup & TinyCSS to do that but now I'd like to switch everything on Selenium as I can load the JS.\nI can't find in the doc a way to target some CSS parameters without having to know the tag\/id\/class. I can get the images from the HTML easily but I need to target every \"background-image\" parameter from the CSS in order to get the URL from it. \nex: background-image: url(\"paper.gif\");\nIs there a way to do it or should I loop into each element and check the corresponding CSS (which would be time-consuming)?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":84,"Q_Id":52558105,"Users Score":1,"Answer":"You can grab all the Style tags and parse them, searching what you look.\nAlso you can download the css file, using the resource URL and parse them.\nAlso you can create a XPATH\/CSS rule for searching nodes that contain the parameter that you're looking for.","Q_Score":1,"Tags":"python,css,selenium,web-scraping,selenium-chromedriver","A_Id":52559637,"CreationDate":"2018-09-28T15:04:00.000","Title":"Selenium Python: How to get css without targetting a specific class\/id\/tag","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"The question related to python - django framework, and probably to experienced django developers. Googled it for some time, also seeked in django queryset itself, but have no answer. Is it possible to know if queryset has been filtered and if so, get key value of filtered parameters?\nI'm developing web system with huge filter set, and I must predefine some user-background behavior if some filters had been affected.","AnswerCount":3,"Available Count":1,"Score":0.1325487884,"is_accepted":false,"ViewCount":787,"Q_Id":52559970,"Users Score":2,"Answer":"You can use the query attribute (i.e. queryset.query) to get the data used in the SQL query (the output isn't exactly valid SQL).\nYou can also use queryset.query.__dict__ to get that data in a dictionary format.","Q_Score":1,"Tags":"python,django,filter,django-queryset","A_Id":52560064,"CreationDate":"2018-09-28T17:11:00.000","Title":"Django - was queryset filtered using some parameters or not","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have some pretty fragile code that I want to refactor.  It's not very easy to unit test by itself because it interacts with database queries and Django form data.\nThat in itself is not a big deal. I already have extensive tests that, among other things, end up calling this function and check that results are as expected.  But my full test suite takes about 5 minutes and I also don't want to have to fix other outstanding issues while working on this.\nWhat I'd like to do is to run nosetests or nose2 on all my tests, track all test_xxx.py files that called the function of interest and then limit my testing during the refactoring to only that subset of test files.\nI plan to use inspect.stack() to do this but was wondering if there is an existing plugin or if someone has done it before.  If not, I intend to post whatever I come up with and maybe that will be of use later.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":34,"Q_Id":52572977,"Users Score":1,"Answer":"You can simply raise some exception in the function and do one run. All tests that fail do call you function.","Q_Score":0,"Tags":"python,unit-testing,introspection","A_Id":52573171,"CreationDate":"2018-09-29T22:12:00.000","Title":"finding out which particular tests call some functions?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a question. I work with one guy who is developing in Php, I am developing in Django right know. This is my first time doing something for other people and he firstly asked me to put my application to Apache Web server document root(I think he didn't know that much about Django, and he did everything this way), so I did it, because I didn't know that much about Apache and servers. But right know I am scared because I have all the python files in document root and I realized that this Web server document root \\www\\myproject might be accessible to other people. How should I change it, where should I put it, what is the best practice? I am deploying with mod_wsgi and Apache 2.4. In the documentation it says, that I shouldn't put code in Web server document root too, but if I put it somewhere else can I access it the same way, like I used to when it was on the Web server document root? Will I have to do something other than changing paths in Apache config?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":560,"Q_Id":52592496,"Users Score":3,"Answer":"You should put the Django project anywhere on the machine except for the apache document root, for security reasons as you have pointed out.\nYou can then configure apache to pint to the location of your wsgi.py which can live in the Django project if you wish:\nWSGIScriptAlias \/ <path to the wsgi.py>\nI'm not aware of a standard place to put the Django project root directory, I guess it depends on the OS and the distribution.","Q_Score":3,"Tags":"python,django,apache,mod-wsgi","A_Id":52592990,"CreationDate":"2018-10-01T13:42:00.000","Title":"Where to put django files on server?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have one very general question and another a bit more specific. \nLet's start with the general one as it is strictly connected with the second one. \nSo I'd like to create a website (internal, not available on the internet) with a form that validates user input and if it doesn't meet certain criteria- it cannot be submitted. \nDoes it make sense to create this website (and form) with python django? I mean- obviously it has a lot of sense but there is something else I am trying to puzzle out here:\nWill it make possible to get user input from this website form and pass it to python selenium script? \nI am trying to figure this out as I'd like to improve ordering process with which I work. It is done with a web application provided by an external provider (all things that happen in this application are automatized with python selenium).\nFor the time being I have to read order form (mostly scanned paper forms, pdfs and faxes) put data to excel and then get them to python selenium script but I would like to stop using excel (as it can be really messy). I have to use excel as an intermediary as I don't have a working OCR (so I am an OCR in this case :)) plus current order forms are very different from one another (and standardization is not an option). \nIs it even possible? Is the way I am thinking about anywhere near common sense? Maybe there is an easier method? Any ideas? Thanks for all advices and suggestions.","AnswerCount":1,"Available Count":1,"Score":0.537049567,"is_accepted":false,"ViewCount":107,"Q_Id":52595166,"Users Score":3,"Answer":"Pretty broad, but definitely possible. I would use Flask personally. You can pass any data easily from a form to python and execute any python code on that data with a simple Flask website.","Q_Score":0,"Tags":"python,django,selenium","A_Id":52595231,"CreationDate":"2018-10-01T16:22:00.000","Title":"Web user input form and passing its contents to python selenium","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have one master server and 6 worker servers (each with a couple workers running on them). All of a sudden, after many months of flawless execution, all of the tasks stopped getting executed, even though there were no code changes. Now, even after rebooting all the servers involved, restarting RabbitMQ, restarting the workers, etc, it appears as though the servers aren't able to find each other, and thus no tasks can be completed.\nWhen I run celery -A proj inspect active, the response is Error: No nodes replied within time constraint. I'm also able to connect to the broker using Flower, but it lists no workers, even though the workers are running and pointing to the same broker. On the master server, which is in charge of adding tasks, my application now appears to hang indefinitely on apply_async.\nIn my application, I have the broker set to pyamqp, and the backend set to rpc:\nCelery('proj', broker='pyamqp:\/\/[master server's IP]', backend='rpc:\/\/[master server's IP]')\nI feel like I'm missing something really simple, but I can't figure out what it is.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1156,"Q_Id":52616841,"Users Score":0,"Answer":"Navigating to \/var\/log\/rabbitmq\/rabbit@[server-name].log and scrolling back to when the issue first occurred led me to this message Disk free space limit now exceeded. Free bytes:999378944 Limit:1000000000. \nTurns out the hard drive was filled to the brim, which was causing all sorts of trouble for RabbitMQ and Celery, it seems. Freeing up space resolved all issues entirely.","Q_Score":0,"Tags":"python,rabbitmq,celery","A_Id":52619210,"CreationDate":"2018-10-02T21:43:00.000","Title":"Celery tasks suddenly stop executing, nodes can't find each other","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I understand that we can use dataFunction.Inputs.SetInput(inputs,\"String(\\\"HelloWorld\\\")\") to set a string to my input parameter. Is there any way I can give an entire column instead of a string.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":131,"Q_Id":52631061,"Users Score":2,"Answer":"Nevermind. I found the answer. It can be done using dataFunction.Inputs.SetInput(inputs,\"[DataTable name].[Column name]\")","Q_Score":1,"Tags":"python,ironpython,spotfire","A_Id":52636271,"CreationDate":"2018-10-03T15:50:00.000","Title":"Spotfire can i input a column through ironpython script?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I designed the PDF(template) in HTML and converting\/using it in Python.\nI need both orientation in my PDF output(Portrait and Landscape)?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":625,"Q_Id":52635198,"Users Score":1,"Answer":"Make your pages as separate files (one with the -O landscape flag in your wkhtml2pdf call, and one without). You can call ghostscript to join the files together in python using the subprocess module","Q_Score":1,"Tags":"html,django,python-2.7,wkhtmltopdf,pdfkit","A_Id":52961456,"CreationDate":"2018-10-03T20:29:00.000","Title":"Generate PDF from HTML using Python with multiple orientation(Portrait and Landscape)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to get from which admin page(app) current request is from in django admin.\nCurrently request.resolver_match.app_name only returns \"admin\" which is not what I want. \nI have noticed that my app name is in 'view_name' and 'url_name' but is it reliable to parse these variables to access current app name?\nDjango 1.11 LTS\nEDIT: For example, when a user enters admin page for my course app with the above method I still only get 'admin' in my request which should be 'course' not 'admin'. My ultimate goal is to hide some of my app model fields in admin page based on user group.\nThanks","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":900,"Q_Id":52641802,"Users Score":1,"Answer":"From a ModelAdmin you have access to the model via self.model. In a ModelAdmin method you can thus get the app name using self.model._meta.app_label.\nI you need to access it from the template rather than the ModelAdmin, self.model._meta is passed to the context as opts. You can thus access it via {% if opts.app_label == \"some_app\" %}.","Q_Score":1,"Tags":"python,django,django-admin,django-apps","A_Id":52642937,"CreationDate":"2018-10-04T07:59:00.000","Title":"How to get current app when user is in Django admin?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am running multiple scrapers using the command line which is an automated process.\nPython : 2.7.12\nScrapy : 1.4.0\nOS : Ubuntu 16.04.4 LTS\nI want to know how scrapy handles the case when \n\nThere is not enough memory\/cpu bandwidth to start a scraper.\nThere is not enough memory\/cpu bandwidth during a scraper run.\n\nI have gone through the documentation but couldn't find anything.\nAnyone answering this, you don't have to know the right answer, if you can point me to the general direction of any resource you know which would be helpful, that would also be appreciated","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":95,"Q_Id":52643398,"Users Score":1,"Answer":"The operating system kills any process that tries to access more memory than the limit.\nApplies to python programs too. and scrapy is no different.\nMore often than not, bandwidth is the bottleneck in scraping \/ crawling applications.\nMemory would only be a bottleneck if there is a serious memory leak in your application.\nYour application would just be very slow if CPU is being shared by many process on the same machine.","Q_Score":0,"Tags":"python,python-2.7,memory-management,scrapy","A_Id":52643555,"CreationDate":"2018-10-04T09:28:00.000","Title":"How does scrapy behave when enough resources are not available","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a raspberry pi 3b+ and i'm showing ip camera stream using the Opencv in python.\nMy default ip in rasppberry is 169.254.210.x range and I have to put the camera in the same range.\nHow can i change my raspberry ip?\nSuppose if I run the program on a web service such as a flask, can i change the raspberry pi server ip every time?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":154,"Q_Id":52652775,"Users Score":0,"Answer":"You can statically change your ip of raspberry pi by editing \/etc\/network\/interfaces\nTry editing a line of the file which contains address.","Q_Score":0,"Tags":"python,networking,flask,raspberry-pi3","A_Id":52653195,"CreationDate":"2018-10-04T17:55:00.000","Title":"how to change raspberry pi ip in flask web service","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working with django and using angularjs. I made a request which responded with an object containing the name, price and date this input was modified. \nMy html has the following {{price_level.modified }} providing me with 2018-01-16T10:15:34.401839Z.\nHere is the data that I am getting when I console.log the data \ncreated: \"2017-06-02T05:01:17.803045Z\"\nfs_charge: 10\nid: 595\nlocked: false\nmodified: \"2018-02-06T07:36:21.517414Z\"\nmoq: 30\nmoq_price: 60","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":33,"Q_Id":52654797,"Users Score":0,"Answer":"If you just want YYYY-MM-DD you could do a substring from position 0 through 9.\nExample in Python dateStr[:10]","Q_Score":1,"Tags":"python,html,angularjs,django","A_Id":52654858,"CreationDate":"2018-10-04T20:37:00.000","Title":"Any way I can shorten the length of this date without having to run date()?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm running my Django application with Apache on CentOS. I already (pip) installed Pillow on my virtualenv(python3.6). When I run python in shell, from PIL import _imaging doesn't generate any error. However, When I put this line of code inside the Django application, it generates an error: cannot import name '_imaging'. This is confusing.\nI set the python path: \/var\/www\/ProjectName\/virtualenv\/bin\/python3.6\/site-packages (in WSGIDaemonProcess), and the error occurred in the same location, so I think it's not an issue that Django is running on another python version.\nMaybe is a mod_wsgi error? I installed mod_wsgi with yum install python35u-mod_wsgi\nCan anyone help me with this issue? Thanks a lot.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":264,"Q_Id":52668420,"Users Score":0,"Answer":"this is really a stupid mistake.\nAs I suggested in the question, the mod_wsgi I'm using is for python3.5.\nSolved by uninstalling python35u-mod_wsgi and installing python36u-mod_wsgi.","Q_Score":0,"Tags":"python,django,apache,centos,python-imaging-library","A_Id":52670862,"CreationDate":"2018-10-05T14:59:00.000","Title":"Python3.6 - cannot import name '_imaging' [Django 2.1.2, Apache 2, CentOS 7]","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working on Django app and i have only one page in my templates directory named \"index\", everything is working well but i faced a problem when i wanted to display the result which will be passed by Django views to my HTML page. I want the value to be displayed on my input field instead of printing it on the browser. I searched a lot but i couldn't found anything related to this.\nI have three fields:\n\nkey field.\nPlaintext field.\nCiphertext field.\nand one button for encryption & decryption.\n\nI need when i click on the button, the result will be displayed on my Ciphertext field not on the browser because i already did that before.\nCan you help me?\nThanks..","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1165,"Q_Id":52683508,"Users Score":0,"Answer":"One of the multiple ways is to, \n\nrender the template from view.\npass the values for \"key field\" and \"plain text filed\" into the context variable (ex: return render(request, context={'key_filed': key_field_value, 'plain_text_field': plain_text_field_value} ).\nUse these values in \"value=\" field of < input > tag. (ex: < inpu type='text' value={{ key_filed }} > and < inpu type='text' value={{ plain_text_field }} >)","Q_Score":1,"Tags":"django,python-3.x,django-templates,django-views","A_Id":52690774,"CreationDate":"2018-10-06T21:30:00.000","Title":"display any value from django views to html form input","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have the following problem; I have a module that reads a 1.5Gb file and then processes it with it. If I run it in the Python console it works normally, however if I make the call from that file read in a django view it returns error 500 before it highlights the entire file load.\nHow to proceed?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":544,"Q_Id":52684364,"Users Score":1,"Answer":"Since the shell is executing the complete request, the request could be getting timed out due to app server or web server:\n\nIf using Nginx as web server, try increasing read time out: proxy_read_timeout < a high value in sec >\nIf using Gunicorn as app server, try increasing this as well:\nTIMEOUT=< a high value in sec >\nIf using wsgi as app server, try either:\nhttp-timeout=< a high value in sec >.","Q_Score":0,"Tags":"python,django,internal-server-error,file-read","A_Id":52690604,"CreationDate":"2018-10-07T00:05:00.000","Title":"Internal server error with large file in django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using ElastiCache for Redis on AWS. But, I'm not able to connect to Redis from localhost. I have used the endpoint on AWS. It always shows connection timed out. Is there a way to make it work?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":511,"Q_Id":52705563,"Users Score":0,"Answer":"The first thing you should make sure is the VPC Security Group that the Elasticache Redis is attached, allows Custom TCP traffic from your address to port number 6379 (default for Redis). \nFor me the connection timed out issue arised due to the inaccessibility to the VPC where the Redis cluster resides.","Q_Score":1,"Tags":"python,amazon-web-services,redis,amazon-elasticache","A_Id":52706805,"CreationDate":"2018-10-08T15:27:00.000","Title":"Connecting to Redis from localhost","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am using ElastiCache for Redis on AWS. But, I'm not able to connect to Redis from localhost. I have used the endpoint on AWS. It always shows connection timed out. Is there a way to make it work?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":511,"Q_Id":52705563,"Users Score":0,"Answer":"Check your security group of Elastic cache cluster. It should allow port 6379 from the EC2 instance. You can allow your EC2 instance's security group in Elastic cache security group to access port 6379.","Q_Score":1,"Tags":"python,amazon-web-services,redis,amazon-elasticache","A_Id":52707528,"CreationDate":"2018-10-08T15:27:00.000","Title":"Connecting to Redis from localhost","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am moving a website from my local dev machine to PA.  I'm getting a template not found error. After a bit of searching, it appears that it is not finding the django_comments form.html template in the templates directory.  Presumably, because of this, collectstatic isn't creating the static file to serve.  Looking at the install on my dev machine, there is a template directory in the site-package but not in the package on PA.  I notice that my django.contrib_comments distro is 1.9.0 while it is 1.8.0 on PA.  (artifact of my venv creation?)\nMy question is \"am I missing something\".  I can certainly get around the problem by including the templates in my own directory, but for obvious reasons, I'd rather not.\nSuggestions?   (if I run pip install, I'm getting a unicode not defined error)\nThx,\n   --Don","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":99,"Q_Id":52720337,"Users Score":1,"Answer":"You need to make sure that the versions for all your packages (python.contrib_comments or otherwise) are the same locally vs on PA.\nOne way to do this by doing a pip freeze > requirements.txt locally, then upload the requirements.txt onto PythonAnywhere, set up a virtualenv on PythonAnywhere, and pip install -r requirements.txt to get the correct version of all the packages. Then configure your PythonAnywhere webapp to use that virtualenv on your webapp dashboard.","Q_Score":0,"Tags":"django,pythonanywhere","A_Id":52722511,"CreationDate":"2018-10-09T11:47:00.000","Title":"django_comments site package missing templates?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've written a small flask rest api application and a related client library that uses requests to interface with the api.  And now I'm writing test cases using pytest.  The tests directly against the flask app run fine using the built in test client.\nHowever, now I'm trying to run tests against the flask app through the client library, and it's failing with errors like:\n\nInvalidSchema(\"No connection adapters were found for '%s'\" % url)\n\nAs I understand, I can separately mock out the requests calls, but is there a way I can test the client library directly against the flask application?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":247,"Q_Id":52729749,"Users Score":1,"Answer":"If you test client library it better to choose mocks your API.\nBut if you want to test client(library) <-> server(flask) integration you need to make some preparation of environment. Like configure client, start server on the same host and port. And then run the tests.","Q_Score":0,"Tags":"python,flask,python-requests,pytest","A_Id":52731357,"CreationDate":"2018-10-09T21:43:00.000","Title":"Testing a flask application with a client that uses requests","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a task written in Python with a 1-2 minute run-time that I want to run on-demand. The requests would come In very small volumes from a Django server on Linux. The return would be a file.\nUsually, I'd use a queue system like Celery. But, this task can only be run on Windows.\nWhat is the best way to make this happen?\nRemotely execute the task by establishing an SSH session? \nStill use Celery, go through a lot of workarounds to get it to work on Windows (seems messy)?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":65,"Q_Id":52732565,"Users Score":0,"Answer":"I could think of 5 solutions which do not require ssh\nI didn't talk about authentication in my solutions you should implement something based on chosen solution \nSolution 1:\n\nwrite a simple flask\/django app for windows server which runs the task and returns response\nin your linux server send a request to windows and get data\nlinux server can make this call using celery so you wouldn't bother about 2\/3 minute wait\n\nSolution 2:\n\nwrite a simple flask\/django app for windows server which calls a celery task in back ground\n\n\nthis app should return the url of result file\n\ncelery task creates a file which contains the result\nserve this file with nginx (or a windows based static file server, I don't know windows)\nsend a request from linux server to windows to get result (if file doesn't exists it means result is not ready yet)\n\nSolution 3:\n\nwrite a simple flask\/django app for windows server which calls a celery task in back ground\n\n\nthis app returns a random id for given request\n\nfrom your linux server send requests to windows app with task id\nwhen task is finished windows app returns result\n\nSolution 4:\n\nwrite a simple flask\/django app for windows server which calls a celery task in back ground\nadd an endpoint to your linux django app for uploading data\nwhen windows app finishes processing it uploads data to linux django app\n\nSolution 5:\n\nsolution 4 but your linux django app is not for uploading data. it only sets a boolean which mean task is done\nif task is done linux server send a request to winsows server to get data (this request contains the task id)","Q_Score":0,"Tags":"python,django,linux,windows,python-3.x","A_Id":52735547,"CreationDate":"2018-10-10T04:17:00.000","Title":"Best way to run task on Windows from web server on Linux","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am new to python and am trying to set up Flask and Python.  I need to set my DATABASE_URL to run flask, but I can't find out my database url, because when I click on Heroku Postgres in my dashboard over view I get the error message:\n{\"error\":{\"id\":\"unauthorized\",\"message\":\"Invalid credentials provided.\"}}\nAny ideas?  Feel like I'm trapped in a weird circle.\nThanks in advance\nVicky","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1134,"Q_Id":52763624,"Users Score":0,"Answer":"thanks, seemed to have sorted it, not quite sure how.  Heroku was showing details I required today, so maybe it was something to do with their site yesterday.","Q_Score":1,"Tags":"python,heroku","A_Id":52793606,"CreationDate":"2018-10-11T15:18:00.000","Title":"This error message {\"error\":{\"id\":\"unauthorized\",\"message\":\"Invalid credentials provided.\"}} when I click on Heroku Postgres","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"When I have a model Car where users can upload a single picture to, I can create a property ImageFile in Django to achieve that. Now I would also like to get the metadata from this file and save them to the database.\nNow I'm very unsure where I should place this method a how I should design it. It would be obvious, to have a method like _set_exifdata() or _update_exifdata() that is called every time I set an Image to the model.\nOr a method get_exifdata(imagefile) that returns a dict of exifdatas. But should this method be part of the Car model? Actually, I won't need it anywhere else, so it does not make sense to put it in a general helper class. But on the other hand, I would prefer to split methods in \"retrieving data\" and \"setting data\", so _update_exif() for example would do both of it in once, and maybe that's OK in design ways, but maybe its not and there is some rules of model design I should know and respect here.\nI hope someone can help me with some guidelines for model design (especially for django) and what methods should be part of methods and which should not.","AnswerCount":1,"Available Count":1,"Score":-0.1973753202,"is_accepted":false,"ViewCount":26,"Q_Id":52781517,"Users Score":-1,"Answer":"if you using only for the car then you can put that value in the model save method, \nwhich will get call every time whenever you will update the data.","Q_Score":0,"Tags":"python,django,python-3.x,design-patterns,model","A_Id":52781590,"CreationDate":"2018-10-12T14:19:00.000","Title":"What methods should a model contain","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I had facebook login setup using python-social-auth a while ago, but it stopped working. Now I updated social auth library and set it up again.\nI went trough a few errors from incorrect secret, incorrect facebook setup up till \"Authentication process canceled\". Now it seems like whole process went successfully, however once I am redirected back, I am still not logged in.\nI think, I have same problem with google auth, which worked alright even before I updated library, so I guess some configuration changed.\nI upgraded from python-social-auth==0.2.21 to python-social-auth==0.3.6.\nI checked newest documentation and changed a few bits, that were different with no help.\nI got standard pipeline, social AUTHENTICATION_BACKENDS first, updated context processors (prefix social.apps.django_app -> social_django), but still no help.\nI already went trough quite a few files of the library and related ones to fix those errors.\nNow I kinda don't know where should I look for problem and dig a bit.\nAny hints would be greatly appreciated!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":137,"Q_Id":52791313,"Users Score":1,"Answer":"Okay, it took me a lot of digging. I knew whole pipeline was going trough and there was user instance in the end + request.user.is_authenticated() returned true. However after redirect, I wasn't logged in.\nIn the end, I found out, I had to change social.backends.facebook.FacebookOAuth2 to social_core.backends.facebook.FacebookOAuth2 in AUTHENTICATION_BACKENDS (and same for GoogleOAuth2).\nVery annoying and hard to find.","Q_Score":0,"Tags":"django,facebook-oauth,python-social-auth","A_Id":52995354,"CreationDate":"2018-10-13T09:04:00.000","Title":"Django facebook login","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm building a PWA with django\/python on the server-side and vue on the client-side and want to use firebase as a database as well as make use of the firebase authentication.\nAfter some thorough research I realised that I had to make a few choices. \nQuestion 1: Authentication \n\nI can do authentication on the client-side or server-side. Which one would be best (more secure) ?\n\nQuestion 2: Database\n\nIn terms of CRUDS I am a bit conflicted. Do I write all my data to firestore from the client-side?\nDo I rather use api's to communicate with my backend and then write data to firestore from the backend? What are the security implications of doing this?\n\nShould I just use both in terms of context? If there are no security implications I would do my authentication client-side and my CRUDS from the server-side. I think I would also have to check authentication to write to the database from the backend.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2897,"Q_Id":52793661,"Users Score":5,"Answer":"Authentication of a user's credentials should always happen on a server, as it can't be securely done on the client's computer. What Firebase Authentication allows however, is that the authentication runs on Google's servers, while you control it from a simple client-side API call.","Q_Score":7,"Tags":"python,django,firebase,vue.js,firebase-authentication","A_Id":52793728,"CreationDate":"2018-10-13T13:54:00.000","Title":"Firebase (client-side vs server-side)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm developing an multi-page web application using python tornado framework (includes API), and because the application is said to be used in mobile I decided to use phonegap to test on mobile.\nNow the question, Is it possible to make tornado application listen to the phonegap (from mobile) ?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":72,"Q_Id":52794736,"Users Score":1,"Answer":"basically you want to install Tornado app in some\/local server server, and create API calls from Phonegap -> Tornado server ?\nIt's possible, if you're developing locally - you have a local address that you define ( 127.0.0.1:8080 or whatever )\nThen from phonegap you can generate Ajax calls towards your server.\nThe best approach in such case, is to not use Tornado with HTML files, with API work always with JSON outputs ....","Q_Score":0,"Tags":"python,tornado,phonegap","A_Id":63304273,"CreationDate":"2018-10-13T15:54:00.000","Title":"Is it possible to use python tornado framework with phonegap?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new in Odoo.\nIs it possible to create new dashboard in odoo10? I want to create dashboard for my pettycash module. If is it possible, How? I appreciate the links and advices.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":145,"Q_Id":52808506,"Users Score":0,"Answer":"All Depends in what kind of dashboard do you need. I suggest you to look at how are developed the currents dashboards that ships with Odoo. You could see several like Website, Sales, Invoicing, etc. \nYou will need to be familiar to Odoo internals and how to code in Odoo to be able to bring complex features alive but also you could add several actions views to compose a custom reporting dashboard by installing the module board","Q_Score":0,"Tags":"python-2.7,odoo-10,dashboard","A_Id":52811023,"CreationDate":"2018-10-15T01:05:00.000","Title":"Dashboard in odoo10","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I built an application using  cookiecutter-django by @pydanny back in May,\ndocker-compose was used for both dev and production environments and it's running very well,\nNow I have a requirement for asynchronous tasks and I want to use Celery,\nI did not choose celery when using the cookiecutter tool way back at the beginning,\nWhat's the best way to integrate celery into my project ?\nAlso noting that I will probably take this opportunity to upgrade docker-compose from version 2 to 3, bring mailgun, Django etc. to the latest versions\nIs it too messy to integrate to a live project ?\nShould I just create a new project using the cookiecutter tool ?\nNot too sure how to approach this so any help would be greatly appreciated,\nThanks","AnswerCount":1,"Available Count":1,"Score":0.537049567,"is_accepted":false,"ViewCount":509,"Q_Id":52819276,"Users Score":3,"Answer":"I solved this by creating a new project from scratch using cookiecutter-django, this time including celery, flower etc. for async tasks. I then migrated my code to the new project. It didn't take too long, you just need to be careful when migrating that you don't miss anything.","Q_Score":4,"Tags":"python,django,docker-compose,cookiecutter-django","A_Id":53374105,"CreationDate":"2018-10-15T14:43:00.000","Title":"Django Cookiecutter upgrade best practice","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm trying to deploy my flask app on Pythonanywhere but am getting an error i have no idea what to do about. I've looked online and people haven't been getting similar errors like mine. \nMy app loads a bunch of pretrained ML models. \nWould love some help!\n\n2018-10-16 20:52:38 \/home\/drdesai\/.virtualenvs\/flask-app-env\/lib\/python3.6\/site-packages\/sklearn\/base.py:251: UserWarning: Trying to unpickle estimator LinearRegression from version 0.19.1 when using version 0.20.0. This might lead to breaking code or invalid results. Use at your own risk.#012  UserWarning)\n2018-10-16 20:52:38 !!! uWSGI process 1 got Segmentation Fault !!!\n2018-10-16 20:52:38 * backtrace of 1 *#012\/usr\/local\/bin\/uwsgi(uwsgi_backtrace+0x2c) [0x46529c]#012\/usr\/local\/bin\/uwsgi(uwsgi_segfault+0x21) [0x465661]#012\/lib\/x86_64-linux-gnu\/libc.so.6(+0x36cb0) [0x7f6ed211ccb0]#012\/home\/drdesai\/.virtualenvs\/flask-app-env\/lib\/python3.6\/site-packages\/sklearn\/neighbors\/kd_tree.cpython-36m-x86_64-linux-gnu.so(+0x404b6) [0x7f6ead1d54b6]#012\/usr\/lib\/x86_64-linux-gnu\/libpython3.6m.so.1.0(_PyCFunction_FastCallDict+0x105) [0x7f6ed0e80005]#012\/usr\/lib\/x86_64-linux-gnu\/libpython3.6m.so.1.0(+0x16b5fa) [0x7f6ed0f195fa]#012\/usr\/lib\/x86_64-linux-gnu\/libpython3.6m.so.1.0(_PyEval_EvalFrameDefault+0x2f3c) [0x7f6ed0f1ccfc]#012\/usr\/lib\/x86_64-linux-gnu\/libpython3.6m.so.1.0(+0x16a890) [0x7f6ed0f18890]#012\/usr\/lib\/x86_64-linux-gnu\/libpython3.6m.so.1.0(+0x16b7b4) [0x7f6ed0f197b4]#012\/usr\/lib\/x86_64-linux-gnu\/libpython3.6m.so.1.0(_PyEval_EvalFrameDefault+0x2f3c) [0x7f6ed0f1ccfc]#012\/usr\/lib\/x86_64-linux-gnu\/libpython3.6m.so.1.0(+0x16a890) [0x7f6ed0f18890]#012\/usr\/lib\/x86_\n2018-10-16 20:52:38 chdir(): No such file or directory [core\/uwsgi.c line 1610]\n2018-10-16 20:52:38 VACUUM: unix socket \/var\/sockets\/drdesai.pythonanywhere.com\/socket removed.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1381,"Q_Id":52844037,"Users Score":0,"Answer":"uWSGI is a C\/C++ compiled app and segmentation fault is its internal error that means that there is some incorrect behavior in uWSGI logic: somewhere in its code it's trying to get access to area of memory it's not allowed to access to, so OS kills this process and returns \"segfault\" error. So make sure you have the latest stable version of uwsgi installed. Also make sure you installed it properly either using a package manager or via manual compiling. It's recommended to install it using a package manager since it's much more easy than via manual compiling. Also, make sure you use it properly.","Q_Score":0,"Tags":"python,flask,deployment,wsgi,pythonanywhere","A_Id":52859940,"CreationDate":"2018-10-16T21:04:00.000","Title":"uWSGI process 1 got Segmentation Fault _ Fail to deploy Flask App on Pythonanywhere","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is there any way I can stop the whole robot test execution with PASS status?\nFor some specific reasons, I need to stop the whole test but still get a GREEN report.\nCurrently I am using FATAL ERROR which will raise a assertion error and return FAIL to report.\nI was trying to create a user keyword to do this, but I am not really familiar with the robot error handling process, could anyone help?\nThere's an attribute ROBOT_EXIT_ON_FAILURE in BuiltIn.py, and I am thinking about to create another attribute like ROBOT_EXIT_ON_SUCCESS, but have no idea how to.\nEnvironment: robotframework==3.0.2 with Python 3.6.5","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":3462,"Q_Id":52846338,"Users Score":0,"Answer":"If I understood you correctly, you need to pass the test execution forcefully and return green status for that test, is that right? You have a built in keyword \"Pass Execution\" for that. Did you try using that?","Q_Score":0,"Tags":"python-3.x,robotframework","A_Id":55419982,"CreationDate":"2018-10-17T02:07:00.000","Title":"How to stop the whole test execution but with PASS status in RobotFramework?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using Django and All-auth. I want to restrict users to take certain usernames. I know that it is done through writing the following in  settings.py.\nACCOUNT_USERNAME_BLACKLIST (=[])\nBut I want to take this list from a .txt file. Should I read the .txt file in my settings.py and then populate the ACCOUNT_USERNAME_BLACKLIST (=[]) list? Or there is some other way that is more reasonable and considered as a best practice?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":153,"Q_Id":52853987,"Users Score":1,"Answer":"Yes. You can just read in the text file in your settings file.\nIts a common practice done where people will often load in a json file that contains values for a load of different settings that may change depending on environment.","Q_Score":0,"Tags":"django,python-2.7,django-allauth","A_Id":52854957,"CreationDate":"2018-10-17T11:38:00.000","Title":"Ban certain users by using ACCOUNT_USERNAME_BLACKLIST (=[]) and getting data from a .txt file","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've some models from models.Model in django and wish to know if I change it and extend to BaseModel will occur some error when I make migrations. Thanks","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":139,"Q_Id":52855657,"Users Score":1,"Answer":"No. If your BaseModel extends models.Model.","Q_Score":0,"Tags":"python,django,django-models,django-migrations","A_Id":52855687,"CreationDate":"2018-10-17T13:08:00.000","Title":"Integrate current models from models.Model to BaseModel django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I use JModelica since many years and now run the current version 2.2. I am interested to share (compiled) FMU-modules and put my name and company into the FMU-module. If your FMU-module have the name model then there is a method model.get_author() that will bring that information. For the FMU-modules I do now I just get a blank result calling this method. How do put in information into my model? Is that possible for the current version of JModelica?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":92,"Q_Id":52860337,"Users Score":2,"Answer":"With the current release of JModelica 2.2, it is not possible for a user to automatically include the author in the generated modelDescription file in the FMU.\nCurrently this has to be done manually by a user (i.e. unzip the FMU, updated the XML, and zip the FMU).","Q_Score":2,"Tags":"python,modelica,fmi,jmodelica","A_Id":52876456,"CreationDate":"2018-10-17T17:16:00.000","Title":"FMU-modules and method get_author()","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"What is a good method for converting an HTML string file to PDF? I am trying to create a simple tool that creates a PDF report using some user inputs and an HTML template. I want to distribute this tool so that other coworkers can use it. \nRight now I am trying to use pdfkit and wkhtmltopdf. The issue is that I can only get this code to work when I specify the path to the wkhtmltopdf.exe file. When I package the code using PyInstaller, other users will not be able to use the program because they do not have the HTML template file or a path to wkhtmltopdf. Any ideas on how to resolve this or are there any alternative python packages\/methods that I should use?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1726,"Q_Id":52864157,"Users Score":1,"Answer":"If you want to package the HTML template in your module and you are using setuptools you can include any other files with a couple of changes: \n\nCreate a file called MANIFEST.in in your base directory of the module \nAdd all of the files you want to include like this: include <path\/to\/file\/in\/module> \nIn setup.py add include_package_data=True to setup()\n\nMaking those changes should allow your module to include your template and allow the other modules to convert it to a PDF. \nIf you are having pathing problems within the module, make sure that you are using absolute paths to reference other files. I would suggest using the builtin os module to build a path which works for any user. For example: os.path.abspath(\"path\/to\/my\/file\")","Q_Score":0,"Tags":"python,html,pyinstaller,wkhtmltopdf,python-pdfkit","A_Id":52864222,"CreationDate":"2018-10-17T21:52:00.000","Title":"Converting HTML to PDF in Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Scrapy Crawlera was working just well in my Windows machine, but it gets error 111 when I run it in my linux server. Why is that?\nWhen I use curl, I got this error:\ncurl: (7) Failed connect to proxy.crawlera.com:8010; Connection refused","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2658,"Q_Id":52866297,"Users Score":1,"Answer":"It turned out when dealing with ports, CPanel (or maybe Linux?) blocks ports by default if it is not whitelisted in the firewall. I opened it via WHM since I use CPanel, and everything works fine now.","Q_Score":1,"Tags":"python,web-scraping,scrapy,screen-scraping,crawlera","A_Id":52882604,"CreationDate":"2018-10-18T02:53:00.000","Title":"Connection was refused by other side: 111: Connection refused. when using Scrapy Crawlera in a linux server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using the Python Spotify library Spotipy with a Raspberry Pi, and I am wondering why there is a 50 song limit when trying to see the user's saved songs? I have looked at the documentation, but I am still confused on the reason. If you answer this thank you so much.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":196,"Q_Id":52866626,"Users Score":0,"Answer":"They don't expect users to be regularly retrieving all of a user's songs, only a portion of them (and potentially by filtered query). In addition, it could be a waste of data if 100 songs are sent, but the user only ends up using one song. \nFifty is a sensible limit, and there is pagination to allow for accessing more than fifty songs in a series of smaller requests (rather than one large request).","Q_Score":0,"Tags":"python,api,spotify,spotipy","A_Id":52866661,"CreationDate":"2018-10-18T03:34:00.000","Title":"Spotipy- Why is there a 50 song limit when getting saved songs?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a python script that takes in a .csv file and performs some data cleaning and some more advanced operations and gives back a .csv file as its output.\nIs there a library I can use to build a webpage and host it on some server for users to be able to upload the input .csv file into it and be able to download the output .csv file?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":57,"Q_Id":52885542,"Users Score":0,"Answer":"I would say your best choice if you are new to web development, is to start learning Flask and the basics of \"How the Web Works\". There are other libraries such as Django or Cherrypy as well. Flask is a web framework that can run a server side application (a.k.a. back-end) and it's relatively simple out of the box.\nHowever, when you say \"running python script on webpage\" and \"build a webpage\", that's not exactly how it works. You will build your webpage (a.k.a. the client-side application or the front-end) using HTML, CSS and possibly JavaScript. Web browsers can't run python.","Q_Score":0,"Tags":"python","A_Id":52885671,"CreationDate":"2018-10-19T03:34:00.000","Title":"Running python script on webpage","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Traceback (most recent call last):\n  File \"\/usr\/bin\/xattr-2.7\", line 7, in <module>\n    from pkg_resources import load_entry_point\nImportError: No module named pkg_resources\nMy PYTHONPATH contains \/usr\/local\/lib\/python3.7\/site-packages, the site-packages folder indeed contains the pkg_resources folder. I tried everything and have spent hours searching stack overflow. I even reinstalled python and setuptools, but nothing seems to work.\nThe command I am using to install Java - brew cask install java","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":181,"Q_Id":52920484,"Users Score":0,"Answer":"I guess I was so lost trying to install it with brew, that I forgot that I could download the dmg file from the Oracle website and install it. I still can't figure out the issue with pkg_resources though.","Q_Score":0,"Tags":"python,homebrew,homebrew-cask","A_Id":52921018,"CreationDate":"2018-10-21T22:30:00.000","Title":"pkg_resources not found while installing java on Mac","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am trying to connect MongoDB from Atlas.\nMy mongo uri is: mongodb+srv:\/\/abc:123@something.something.com\/admin?retryWrites=True\nMy pymongo version is 3.6.1\nI have installed dnspython and done import dns\nBut i still get this error:\n\ndnspython module must be installed to use mongodb+srv:\/\/ URI","AnswerCount":10,"Available Count":5,"Score":1.0,"is_accepted":false,"ViewCount":69143,"Q_Id":52930341,"Users Score":19,"Answer":"I solved this problem with:\n$ python -m pip install pymongo[srv]","Q_Score":70,"Tags":"python,mongodb,pymongo","A_Id":57184519,"CreationDate":"2018-10-22T13:15:00.000","Title":"pymongo - \"dnspython\" module must be installed to use mongodb+srv:\/\/ URIs","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am trying to connect MongoDB from Atlas.\nMy mongo uri is: mongodb+srv:\/\/abc:123@something.something.com\/admin?retryWrites=True\nMy pymongo version is 3.6.1\nI have installed dnspython and done import dns\nBut i still get this error:\n\ndnspython module must be installed to use mongodb+srv:\/\/ URI","AnswerCount":10,"Available Count":5,"Score":0.0798297691,"is_accepted":false,"ViewCount":69143,"Q_Id":52930341,"Users Score":4,"Answer":"you can use mongo:\/\/ instead of mongodb+srv:\/\/","Q_Score":70,"Tags":"python,mongodb,pymongo","A_Id":58155698,"CreationDate":"2018-10-22T13:15:00.000","Title":"pymongo - \"dnspython\" module must be installed to use mongodb+srv:\/\/ URIs","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am trying to connect MongoDB from Atlas.\nMy mongo uri is: mongodb+srv:\/\/abc:123@something.something.com\/admin?retryWrites=True\nMy pymongo version is 3.6.1\nI have installed dnspython and done import dns\nBut i still get this error:\n\ndnspython module must be installed to use mongodb+srv:\/\/ URI","AnswerCount":10,"Available Count":5,"Score":1.0,"is_accepted":false,"ViewCount":69143,"Q_Id":52930341,"Users Score":10,"Answer":"I got stuck with the same problem and tried\npip install dnspython==2.0.0\nThis is the latest version from https:\/\/pypi.org\/project\/dnspython\/\nIt worked :D","Q_Score":70,"Tags":"python,mongodb,pymongo","A_Id":63568124,"CreationDate":"2018-10-22T13:15:00.000","Title":"pymongo - \"dnspython\" module must be installed to use mongodb+srv:\/\/ URIs","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am trying to connect MongoDB from Atlas.\nMy mongo uri is: mongodb+srv:\/\/abc:123@something.something.com\/admin?retryWrites=True\nMy pymongo version is 3.6.1\nI have installed dnspython and done import dns\nBut i still get this error:\n\ndnspython module must be installed to use mongodb+srv:\/\/ URI","AnswerCount":10,"Available Count":5,"Score":0.0,"is_accepted":false,"ViewCount":69143,"Q_Id":52930341,"Users Score":0,"Answer":"May be the protocol, your URI should start with:\nmongo+srv instead of mongo+src\nIf it still not working please put a pip list with the versions of PyMongo and dnspython (and version of python that you are using)","Q_Score":70,"Tags":"python,mongodb,pymongo","A_Id":53311044,"CreationDate":"2018-10-22T13:15:00.000","Title":"pymongo - \"dnspython\" module must be installed to use mongodb+srv:\/\/ URIs","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am trying to connect MongoDB from Atlas.\nMy mongo uri is: mongodb+srv:\/\/abc:123@something.something.com\/admin?retryWrites=True\nMy pymongo version is 3.6.1\nI have installed dnspython and done import dns\nBut i still get this error:\n\ndnspython module must be installed to use mongodb+srv:\/\/ URI","AnswerCount":10,"Available Count":5,"Score":1.0,"is_accepted":false,"ViewCount":69143,"Q_Id":52930341,"Users Score":18,"Answer":"I would like to answer my own questions here. As I mentioned in the comment, the kernel of the jupyter notebook has to be restarted in order for the pymongo to take effect of the loaded dnspython.","Q_Score":70,"Tags":"python,mongodb,pymongo","A_Id":53644925,"CreationDate":"2018-10-22T13:15:00.000","Title":"pymongo - \"dnspython\" module must be installed to use mongodb+srv:\/\/ URIs","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"For a project work, I need to measure the volume level either from a recorded audio file or in real time recording using a mic. After my primary research, I have tried using soundfile library. The file was read using soundfile and using 20*np.log10(np.sqrt(np.mean(np.absolute(a)**2))), I have calculated the dB value. I'm getting a negative value for the sound file. But a normal sound may be in the range of 50-70 dB and I'm getting a negative value. Can anybody help me to sort out this?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":10925,"Q_Id":52943151,"Users Score":1,"Answer":"You need to add reference of sound i.e 20 log10(P rms_value\/P ref)+120 dB to get the data in the range of dB scale, Pref can be tuned from your input module","Q_Score":2,"Tags":"python,numpy,signal-processing,wav,pyaudio","A_Id":59115025,"CreationDate":"2018-10-23T07:12:00.000","Title":"Python: Get volume decibel Level real time or from a wav file","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Im trying to use django with oracle nosql. I know django supports oracleDB but I don't know if oracle regular driver can be used by oracle nosql too. is there any driver for Nosql to support code first?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":122,"Q_Id":52948200,"Users Score":1,"Answer":"Django supports Oracle Database Server versions 12.1 and higher. Version 5.2 or higher of the cx_Oracle Python driver is required.","Q_Score":0,"Tags":"python,django,oracle,oracle-nosql","A_Id":52948367,"CreationDate":"2018-10-23T11:43:00.000","Title":"Does Django support oracleDB nosql?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a project I\u2019m exploring where I want to scrape the real estate broker websites in my country (30-40 websites of listings) and keep the information about each property in a database. \nI have experimented a bit with scraping in python using both BeautifulSoup and Scrapy. \nWhat I would Ideally like to achieve is a daily updated database that will find new properties and remove properties when they are sold.\nAny pointers as to how to achieve this? \nI am relatively new to programming and open to learning different languages and resources if python isn\u2019t suitable.\nSorry if this forum isn\u2019t intended for this kind of vague question :-)","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":129,"Q_Id":52962131,"Users Score":0,"Answer":"Build a scraper and schedule a daily run. You can use scrapy and the daily run will update the database daily.","Q_Score":0,"Tags":"python,database,web-scraping,automation,scrapy","A_Id":52967603,"CreationDate":"2018-10-24T06:17:00.000","Title":"Building comprehensive scraping program\/database for real estate websites","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I know that many have posted similar question however I tried most solution without success.\nI'm trying to host a webpage with apache2 and django in python3.\nIn the error log I found ImportError: No module named 'django' when accessing the wsgi.pyfile, where I also added import sys, sys.version to confirm which python version is used and from the error log I can see that I'm running following python version 3.5.2 (default, Nov 23 2017, 16:37:01) [GCC 5.4.0 20160609]. \nWhen I run python3.5 I see that I uses the same python version and here I can run import django without any error! \nEDIT: I checked django.__file__and saw that it was located in \/home\/USERNAME\/.local\/lib\/python3.5\/site-packages\/django\/init.py and that path \/home\/USERNAME\/.local\/lib\/python3.5\/site-packages wasn't in the sys.path that tried to run django. But adding it with sys.path.append(path) didn't help :(\nAny thoughts what I might have messed up?","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":25,"Q_Id":52976429,"Users Score":0,"Answer":"Location - means the path where env will be located in project directory, if you have followed the standard installation process of django or else you don't need, and version id- vesion of django framework.","Q_Score":0,"Tags":"django,python-3.x,apache","A_Id":52997325,"CreationDate":"2018-10-24T19:16:00.000","Title":"ImportError: No module named 'django' despite having it installed running apache2 server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I know that many have posted similar question however I tried most solution without success.\nI'm trying to host a webpage with apache2 and django in python3.\nIn the error log I found ImportError: No module named 'django' when accessing the wsgi.pyfile, where I also added import sys, sys.version to confirm which python version is used and from the error log I can see that I'm running following python version 3.5.2 (default, Nov 23 2017, 16:37:01) [GCC 5.4.0 20160609]. \nWhen I run python3.5 I see that I uses the same python version and here I can run import django without any error! \nEDIT: I checked django.__file__and saw that it was located in \/home\/USERNAME\/.local\/lib\/python3.5\/site-packages\/django\/init.py and that path \/home\/USERNAME\/.local\/lib\/python3.5\/site-packages wasn't in the sys.path that tried to run django. But adding it with sys.path.append(path) didn't help :(\nAny thoughts what I might have messed up?","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":25,"Q_Id":52976429,"Users Score":0,"Answer":"I finally understood how to solve it! first I had to run pip3 uninstall django then run sudo pip3 install django.","Q_Score":0,"Tags":"django,python-3.x,apache","A_Id":52997956,"CreationDate":"2018-10-24T19:16:00.000","Title":"ImportError: No module named 'django' despite having it installed running apache2 server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Can you change the file metadata on a cloud database using Apache Beam? From what I understand, Beam is used to set up dataflow pipelines for Google Dataflow. But is it possible to use Beam to change the metadata if you have the necessary changes in a CSV file without setting up and running an entire new pipeline? If it is possible, how do you do it?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":294,"Q_Id":52978251,"Users Score":0,"Answer":"You could code Cloud Dataflow to handle this but I would not. A simple GCE instance would be easier to develop and run the job. An even better choice might be UDF (see below).\nThere are some guidelines for when Cloud Dataflow is appropriate:\n\nYour data is not tabular and you can not use SQL to do the analysis.\nLarge portions of the job are parallel -- in other words, you can process different subsets of the data on different machines.\nYour logic involves custom functions, iterations, etc...\nThe distribution of the work varies across your data subsets.\n\nSince your task involves modifying a database, I am assuming a SQL database, it would be much easier and faster to write a UDF to process and modify the database.","Q_Score":1,"Tags":"java,python,google-cloud-platform,apache-beam,database-metadata","A_Id":52980803,"CreationDate":"2018-10-24T21:37:00.000","Title":"Change file metadata using Apache Beam on a cloud database?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"In Django 1.8 the max_length of name field for Group model in the auth app is by default 80 characters.\nI need to increase this limit without extending the default group model.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":70,"Q_Id":52982698,"Users Score":0,"Answer":"Short answer: I don't think that it is possible.\nYou probably need to extend the model if you want to change anything on it.\n\nYou could go into the source of the Django lib (probably located in your python installation somewhere in site-packages\/) and make the change there and then make migrations, but that is generally a bad idea since it will cause you troubles when trying to update to a newer Django version later on. And it will even be worse if you need to deploy the code on other machines.\nSome IDEs will even prevent modifications on files from external libs (for example, the Django files in site-packages\/) to protect developers from themselfs.","Q_Score":0,"Tags":"python,django,orm","A_Id":52986729,"CreationDate":"2018-10-25T06:29:00.000","Title":"django auth: increasing max_length group name field","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working on a project which used to be run on Linux for test. It's an App Engine flex project, run with gunicorn. Gunicorn does not work on Windows if I understood well, so I've been adviced to use waitress.\nI also use virtualenv in my project.\nSo when I'm in my virtualenv, I run waitress-serve main:app (the gunicorn cmd was gunicorn -b :8080 main:app). I get an error: It had these arguments:\n1. No module named flask.\nI use flask. I can see the flask folder in my virtualenv folder. And when I run python then from flask import Flask I have no error.\nIs there compat issue between waitress and virtualenv ? Or I'm doing something else wrong ? (already tried to delete virtualenv folder and install all the things again)","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2684,"Q_Id":52991755,"Users Score":0,"Answer":"Python modules are case sensitive\nTry Flask not flask.","Q_Score":2,"Tags":"python,virtualenv,python-import,waitress","A_Id":52992108,"CreationDate":"2018-10-25T14:28:00.000","Title":"No module named flask with waitress-serve and virtualenv (App engine flex)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've been writing my first Django app and hit a problem with using templates.\nNo matter how I format the url for the template I receive the TemplateDoesNotExist error.\nMy html is nest in views\/ with the core template being views\/template.html.\nI have tried:\nmyapp\/views\/template.html\nviews\/template.html\ntemplates\/views\/template.html\n<full path to app>\/<all variations>\nNone of which can locate the template.\nI understand the TEMPLATE_DIRS variable may be set at project level but this is app-specific and the views\/ directory is not purely for templates.\nI don't think I should add to the url_patterns since the template shouldn't be accessible directly.\nI've got this far without them but need to clean up the app.\nAny advice?\nEdit:\nThe only line in my controller currently is:\ntemplate = loader.get_template(\"test\/templates\/test\/template.html\")\nThe line has been tested with every variation mentioned above and the one from the first comment.\nThere are no additional lines added to the urlpatterns, as I understand it adding to here would open access up to the public via url.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":50,"Q_Id":52992304,"Users Score":0,"Answer":"it should be:\ntemplate = loader.get_template(\"test\/template.html\")","Q_Score":0,"Tags":"python,django","A_Id":52992683,"CreationDate":"2018-10-25T14:55:00.000","Title":"Django: using html templates TemplateDoesNotExist","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a webcam, a microphone and a python GUI. The user shows the camera an object and using voice command asks \"what is this object?\". The webcam takes a photo of the camera frame and pushes it to a flask endpoint. I have a VGG16 model hosted in the flask app which responds with a object class based on the image from camera.\nWhat I want to do now is, if the object is not recognised, a learning cycle should be triggered. In this cycle I will tell the model what the object is (voice to text), which will be the label for the object. I got that working.\nWhat's not working is the next time (after the learning is complete), if I show the object to the camera, the model should be able to tell me what this object is.\nCould someone please advise me on the following:\n\nIs VGG16 (trained initially on 2 objects using transfer learning) the best model for this type of task? Currently, it is classifying unseen objects as one of the two classes.\nHow would you go about implementing this solution on the cloud (AWS, Azure etc.)\n\nThank you.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":34,"Q_Id":53031577,"Users Score":0,"Answer":"Is VGG16 (trained initially on 2 objects using transfer learning) the\n  best model for this type of task? Currently, it is classifying unseen\n  objects as one of the two classes.\n\n\nFirstly the reason  for \"it is classifying unseen objects as one of the two classes \" is simply that, you only allow it to classify between the two classes, so what happens is that even if you show it an unknown object it is supposed to fit it on either of the classes and post its best prediction, what you should be do is that train it on 3 distinctive classes {object1, object2, unknownObject}, so you may correctly predict unknown objects, now this may be a bit problematic, and would require retraining the model, the other thing that you could do is that you should set a threshold, basically when you give it an unseen object it could give the prediction confidence as follows {75%, 25%} or maybe {51%, 49%} you should set a threshold here, that unless your model is more than 90-95% sure of the prediction you take it to be an unknown object, now i am in no way saying this should be your threshold value, you threshold could either be .9 \/ .95 as mentioned above, or it could even be .75, that is a hyper parameter and you should employ ways to figure that threshold out\n\n\nHow would you go about implementing this solution on the cloud (AWS,\n  Azure etc.)\n\n\nYou already have a flask server, just deploy the flask server on an AWS machine, and make it directly accessible via a static public external IP, hence you can post\/get a request to that specific IP and run your model from any interface","Q_Score":1,"Tags":"python,amazon-web-services,azure,tensorflow,keras","A_Id":53032153,"CreationDate":"2018-10-28T12:35:00.000","Title":"Classify New Objects in Images Live","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I installed Odoo 10 CE on windows 7. In one custom module, I use import winreg but it gives me the error: ImportError: No module named winreg\nHow can I resolve this?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":728,"Q_Id":53041565,"Users Score":1,"Answer":"if you are using python 2 try: import _winreg as winreg","Q_Score":0,"Tags":"python,odoo","A_Id":53041738,"CreationDate":"2018-10-29T08:35:00.000","Title":"ImportError: No module named winreg - Odoo10","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want output from my Django server as well as Django management commands to all be written to the same file.  This is easy to set up in the settings.py file, but are there any concerns with thread safety or file locking with a management command (which is run from the command line) trying to write to the same file as the main Django server (running from wsgi)?  Any concerns with this set up running under Windows vs Linux or other operating systems?\nIn case there are different answers in different versions:\npython 3.4\nDjango 1.11\nThanks!","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":127,"Q_Id":53070767,"Users Score":0,"Answer":"An alternative would be for all logging to be sent to a queue (e.g. a Redis queue) and then a single process reads the queue and writes records to file. There could be much more to think about here, so this may or may not be appropriate for your needs, but it would eliminate file locking.","Q_Score":0,"Tags":"python,django,logging","A_Id":54849783,"CreationDate":"2018-10-30T18:33:00.000","Title":"Django logging thread safety between server and commands","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"What is the recommended way to run Flask app (e.g. via Gunicorn?) and how to make it up and running automatically after linux server (redhat) restart?\nThanks","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":636,"Q_Id":53092810,"Users Score":0,"Answer":"have you looked at supervisord?  it works reasonably well and handles restarting processes automatically if they fail as well as looking after error logs nicely","Q_Score":0,"Tags":"python,linux,flask,redhat","A_Id":53092907,"CreationDate":"2018-10-31T22:26:00.000","Title":"How to make Flask app up and running after server restart?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to connect to a remote rabbitmq server. I have the correct credentials and vhost exists on the remove server, but I cannot connect.\nI get the error \n\npika.exceptions.ProbableAccessDeniedError: (530, 'NOT_ALLOWED - vhost\n  test_vhost not found')\n\nI have struggled with this for a while but I can't seem to get what the problem is.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":10124,"Q_Id":53102929,"Users Score":7,"Answer":"I figured it out. On my local machine I am using rabbitmq version 3.5.7 while on the remote rabbitmq is on version 3.7.0\nI had been declaring my vhost without a slash '\/' on 3.5.2 and it has been working well but I realized that adding a slash before declaring the vhost worked on version 3.7.0 .\nSo now I use \/test_vhost instead of just test_vhost","Q_Score":8,"Tags":"python,rabbitmq,pika","A_Id":53117628,"CreationDate":"2018-11-01T14:05:00.000","Title":"RabbitMQ Error 530 vhost not found with pika","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Im creating a Vue single page aplication with DRF backend. I have images stored in filesystem and one of my models has a field containing the adress of the image. \nHow can i pass the image to the frontend?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":38,"Q_Id":53110787,"Users Score":0,"Answer":"If the html can access the image, try this\n<body>\n        {% for item in imgs %}\n            <img src=\"{{ item.img_url.url }}\"><br\/>\n        {% endfor %}\n    <\/body>","Q_Score":0,"Tags":"python,django,django-rest-framework","A_Id":53111124,"CreationDate":"2018-11-01T23:30:00.000","Title":"What is the correct way to return images from django rest api?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'd like to post a video from url to my Facebook page. Is there any way for it, I already be able to post Images but seems like it's no way for video?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":206,"Q_Id":53112641,"Users Score":0,"Answer":"I'd like to post a video from url to my Facebook page. Is there any way for it, I already be able to post Images but seems like it's no way for video?\n\nThat is correct, videos can not be uploaded by specifying a video URL.\nYou need to perform an actual HTTP upload in multipart\/form-data format.","Q_Score":0,"Tags":"python,django,facebook,facebook-graph-api","A_Id":53114362,"CreationDate":"2018-11-02T04:22:00.000","Title":"Post video to Facebook Page with Facebook SDK","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a problem when I try to use flask_cors in my flask app but when I deploy this app on Heroku so it fails and from the Heroku logs I have this error :\nfrom flask_cors import CORS, cross_origin \n ModuleNotFoundError: No module named 'flask_cors'\nI have added 'flask_cors' in the requirement.txt file but it's still no work. Thank you!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":406,"Q_Id":53114970,"Users Score":0,"Answer":"Did you run pip install when deploying? 'requirements.txt' just specify the dependencies of current project and you need to install them.\nMake sure you have the pip install -r requirements.txt command before start the flask app.","Q_Score":0,"Tags":"python,heroku,flask,cors","A_Id":53116610,"CreationDate":"2018-11-02T08:23:00.000","Title":"How to add flask cor module to work on Heroku?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on a project for a client in which I need to load a lot of data into data studio. I am having trouble getting the deployment to work with my REST API. \nThe API has been tested with code locally but I need to know how to make it compatible with the code base in App Scripts. Has anyone else had experience with working around this? The endpoint is a Python Flask application. \nAlso, is there a limit on the amount of data that you can dump in a single response to the Data Studio? As a solution to my needs(needing to be able to load data for 300+ accounts) I have created a program that caches the data needed from each account and returns the whole payload at once. There are a lot of entries, so I was wondering if they had a limit to what can be uploaded at once. \nThank you in advance","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":146,"Q_Id":53128705,"Users Score":1,"Answer":"I found the issue, it was a simple case of forgetting to add the url to the whitelist.","Q_Score":0,"Tags":"javascript,python,rest,google-apps-script,google-data-studio","A_Id":53149427,"CreationDate":"2018-11-03T05:34:00.000","Title":"Google Data Studio Connector and App Scripts","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I need to add a real-time chart to my Flask-SocketIO app, for that i found Plotly.\nWould it be possible with Plotly to generate a chart which shows both real-time data and past data? When the user opens the page he should be able to see both the data from before the webpage was opened and the new data. How would it be possible to accomplish that with Plotly? Is there an example for it?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":251,"Q_Id":53134005,"Users Score":1,"Answer":"For this kind of apps it's highly recommended to feed your real time data to a database and connect your visualization with said database, however I think it is possible to achieve what you want in jupyter notebook with plotly 3 FigureWidget's batch_update. I can't quite get the idea of what you want without some code though.","Q_Score":0,"Tags":"python,python-3.x,plotly","A_Id":53147499,"CreationDate":"2018-11-03T17:53:00.000","Title":"Real time charting with Plotly and Flask?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How can I get this to happen in Apache (with python, on Debian if it matters)?\n\nUser submits a form\nBased on the form entries I calculate which html file to serve them (say 0101.html)\nIf 0101.html exists, redirect them directly to 0101.html\nOtherwise, run a script to create 0101.html, then redirect them to it.\n\nThanks!\nEdit: I see there was a vote to close as too broad (though no comment or suggestion). I am just looking for a minimum working example of the Apache configuration files I would need. If you want the concrete way I think it will be done, I think apache just needs to check if 0101.html exists, if so serve it, otherwise run cgi\/myprogram.py with input argument 0101.html. Hope this helps. If not, please suggest how I can make it more specific. Thank you.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":100,"Q_Id":53142553,"Users Score":0,"Answer":"Apache shouldn't care. Just serve a program that looks for the file. If it finds it it will read it (or whatever and) return results and if it doesn't find it, it will create and return the result. All can be done with a simple python file.","Q_Score":1,"Tags":"python,apache,cgi","A_Id":53142803,"CreationDate":"2018-11-04T15:50:00.000","Title":"Apache - if file does not exist, run script to create it, then serve it","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"While on a scrapy shell, when I try to use the view(response) function, instead of opening a browser, it opens Visual Studio Code. How to make it open on a browser?\nI read that webbrowser is the library used to view the page and that I could set the BROWSER variable to change its default. On a Linux Mint system, to which value should I change the BROWSER variable to in order to make the view command to open firefox?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":252,"Q_Id":53149544,"Users Score":2,"Answer":"Found the answer myself after some further searching.\nThe value of the BROWSER variable should be \/usr\/bin\/firefox.\nSo, in my case, adding the following line to my ~\/.bashrc file did the trick:\nexport BROWSER=\/usr\/bin\/firefox.","Q_Score":2,"Tags":"scrapy,python-webbrowser,scrapy-shell","A_Id":53149857,"CreationDate":"2018-11-05T06:45:00.000","Title":"Change default browser while using scrapy's shell view function","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Im writing a webapplication, where im trying to display the connected USB devices. I found a Python function that does exactly what i want but i cant really figure out how to call the function from my HTML code, preferably on the click of a button.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":76,"Q_Id":53152383,"Users Score":0,"Answer":"simple answer: you can't. the code would have to be run client-side, and no browser would execute potentially malicious code automatically (and not every system has a python interpreter installed). \nthe only thing you can execute client-side (without the user taking action, e.g. downloading a program or browser add-on) is javascript.","Q_Score":0,"Tags":"python,html,python-2.7","A_Id":53152455,"CreationDate":"2018-11-05T10:20:00.000","Title":"Calling a Python function from HTML","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created a lambda that iterates over all the files in a given S3 bucket and deletes the files in S3 bucket. The S3 bucket has around 100K files and I am selecting and deleting the around 60K files. I have set the timeout for lambda to max (15 minutes) timeout value. The lambda is consistently returning \"network error\" after few minutes though it seems to run in the background for sometime even after the error is returned. How can get around this?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":14183,"Q_Id":53180543,"Users Score":1,"Answer":"I was testing another function and this error came up as a result. Reading a little in the documentation I found that I activated the throttle option, that it reduces the amount of rate for your function.\nThe solution is to create another function and see if the throttle is making that error.","Q_Score":4,"Tags":"python,amazon-web-services,amazon-s3,aws-lambda,boto3","A_Id":65430231,"CreationDate":"2018-11-06T21:47:00.000","Title":"AWS Lambda : Calling the invoke API action failed with this message: Network Error","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using flask-socketio library in my flask project and eventlet library is necessary to let the emit from child processes through monkey patching, but the problem is when doing eventlet.monkey_patch() the grand-child processes are being ignored. Anyone can help in clearing things up?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":235,"Q_Id":53194141,"Users Score":1,"Answer":"I replaced all the processes with threads\nEven the multi-processing i replaced it with thread pools\nTo make sure they have the same memory in the Ram\nAnd avoid the collision with eventlet with multi-processing","Q_Score":1,"Tags":"python-2.7,asynchronous,flask,socket.io,eventlet","A_Id":53335130,"CreationDate":"2018-11-07T16:51:00.000","Title":"eventlet.monkey_patch() is ignoring child processes","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to build a Thrift proxy, with Apache Thrift, to filter some requests directed to a Thrift server.\nThe flow should be like Thrift Client <-> Proxy <-> Thrift Server for all RPC calls.\nBasically the Thrift server binds to some services that expose some callable methods. I want to develop a proxy which is able to filter any requests: the client is allowed to call only some methods on some services so I want to discard any request which is not allowed.\nI can't modify the Thrift Server code that's why I need a proxy.\nIs there any solution or Thrift class which would be good in this case?\nRight now I am using python.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":357,"Q_Id":53202066,"Users Score":0,"Answer":"Nothing specific in trunk to do this, however you could easily write a quick service implementation using the same IDL the real server uses. Your service could them filter client calls as needed and call through to the real server when appropriate. Your service would thus be a server to the client and a client to the real server. It would probably be good to throw a TApplicationException back to the client for calls you want to reject.","Q_Score":1,"Tags":"python,proxy,rpc,thrift,thrift-protocol","A_Id":53714191,"CreationDate":"2018-11-08T05:35:00.000","Title":"Apache Thrift proxy for filtering requests","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm writing a python flask application in combination with rethinkDB.\nsnippit structure: \n{'Name': ['Gandalf', 'Jackson'], 'street': 'elmStreet'...}\nThis kind of structure is used multiple times, so basically I have all my keys as a string and my values are either also strings or an array with strings.\nSo I want a full-text search on this structure without using ElasticSearch or any additional program if it is possible.\nThanks for reading, have a nice day :)","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":72,"Q_Id":53204729,"Users Score":0,"Answer":"I solved my issue, by using the python search engine whoosh, for it no additional program is needed.","Q_Score":0,"Tags":"rethinkdb-python","A_Id":53299934,"CreationDate":"2018-11-08T09:23:00.000","Title":"Rethinkdb: search a string in whole table (full text search like)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In Jupyter Notebook, I am able to convert a notebook to pdf and HTML using nbconvert. However, there is no way to convert it into .doc(Word Document). Is there a way to convert it to MS Word keeping the same text highlights and table structure?","AnswerCount":5,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":32558,"Q_Id":53207734,"Users Score":0,"Answer":"Use the command \"jupyter notebook filename.ipynb\" to run the notebook in a browser.\nUse the notebook's File menu to Download as HTML.\nOpen MS Word, and, from Word, open the HTML file.\n\nThis gives a copy of the notebook that is more faithful to the original notebook than, for example, going via markdown and pandoc, which does not render the notebook perfectly.\nYou can then carry out any Word operation you like (eg. save as docx, indicate changes using Track Mode TRK, etc, etc).\nI have not tried tables. Could someone try using tables with this technique and give feedback?","Q_Score":11,"Tags":"python-3.x,jupyter-notebook,nbconvert,.doc","A_Id":70084518,"CreationDate":"2018-11-08T12:26:00.000","Title":"Convert Jupyter notebook into MS word document .doc?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I would like to put my Keras NER model up to my website which is Django based.\nMy question is that when served, should the model be run on CPU or GPU? How would a GPU handle let's say hundreds of users sending requests at the same time since it cant do multi threading like CPUs can.  \nThanks for your time.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":107,"Q_Id":53212713,"Users Score":0,"Answer":"\"hundreds of users\" will necessitate using a GPU.\nknowing what your users are doing might give more insight, but I would consider having a dedicated instance for your model.  Design a small program that is persistent and waits for input data using a queue strategy.\nLet's say you have \"100s\" of users uploading \"text documents\" for your ner model. Your web application would gather\/validate the text upload\/post and make a socket connection to your model server, pass the text, receive the response, parse the response and respond to the user accordingly.\nYour model server has a socket listener that upon connection, passes the socket+data request to a queue. Your model sits and waits...looking at that queue--takes any item in the queue, processes and passes the results back via the included socket(serialized handle). It's a bit messy in python but works fine.\nThe reasons to have a persistent model running:\n1) for \"100s\" of users, spinning up a model app each time takes several seconds. having it already initialized and ready to go will help user experience.\n2) using one gpu server you don't want competition for gpu resources.","Q_Score":0,"Tags":"python,django,keras","A_Id":53214235,"CreationDate":"2018-11-08T17:03:00.000","Title":"Keras Model Serving- GPU vs CPU","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on a project using AWS ECS. I want to use Celery as a distributed task queue. Celery Worker can be build up as EC2 type, but because of the large amount of time that the instance is in the idle state, I think it would be cost-effective for AWS Fargate to run the job and quit immediately.\nDo you have suggestions on how to use the Celery Worker efficiently in the AWS cloud?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":5029,"Q_Id":53218715,"Users Score":6,"Answer":"Fargate launch type is going to take longer to spin up than EC2 launch type, because AWS is doing all the \"host things\" for you when you start the task, including the notoriously slow attaching of an ENI, and likely downloading the image from a Docker repo. Right now there's no contest, EC2 launch type is faster every time.\nSo it really depends on the type of work you want the workers to do. You can expect a new Fargate task to take a few minutes to enter a RUNNING state for the aforementioned reasons. EC2 launch, on the other hand, because the ENI is already in place on your host and the image is already downloaded (at best) or mostly downloaded (likely worst), will move from PENDING to RUNNING very quickly.\n\nUse EC2 launch type for steady workloads, use Fargate launch type for burst capacity\nThis is the current prevailing wisdom, often discussed as a cost factor because Fargate can't take advantage of the typical EC2 cost savings mechanisms like reserved instances and spot pricing. It's expensive to run Fargate all the time, compared to EC2.\nTo be clear, it's perfectly fine to run 100% in Fargate (we do), but you have to be willing to accept the downsides of doing that - slower scaling and cost.\nNote you can run both launch types in the same cluster. Clusters are logical anyway, just a way to organize your resources.\n\nExample cluster\nThis example shows a static EC2 launch type service running 4 celery tasks. The number of tasks, specs, instance size and all doesn't really matter, do it up however you like. The important thing is - EC2 launch type service doesn't need to scale; the Fargate launch type service is able to scale from nothing running (during periods where there's little or no work to do) to as many workers as you can handle, based on your scaling rules.\nEC2 launch type Celery service\nRunning 1 EC2 launch type t3.medium (2vcpu\/4GB).\nMin tasks: 2, Desired: 4, Max tasks: 4\nRunning 4 celery tasks at 512\/1024 in this EC2 launch type.\nNo scaling policies\nFargate launch type Celery service\nMin tasks: 0, Desired: (x), Max tasks: 32\nRunning (x) celery tasks (same task def as EC2 launch type) at 512\/1024\nAdd scaling policies to this service","Q_Score":5,"Tags":"python,amazon-web-services,celery,amazon-ecs,aws-fargate","A_Id":53268305,"CreationDate":"2018-11-09T01:48:00.000","Title":"Operating the Celery Worker in the ECS Fargate","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'd like to build docs using Sphinx, but without any JavaScript. Is there a straight forward way to configure Sphinx not to include any JavaScript? Setting an empty html_js_files in the conf.py doesn't do the trick.\nObviously there will be some functionality missing, like the search box. However it seems that no core functionality that I care about is impacted when manually removing the scripts.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":408,"Q_Id":53227558,"Users Score":2,"Answer":"Modify your theme's template where the JavaScript is included, removing that HTML tag.","Q_Score":4,"Tags":"python-sphinx","A_Id":53236753,"CreationDate":"2018-11-09T14:24:00.000","Title":"Sphinx docs without JavaScript","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"In Visual Studio 2015 and 2017, I always get an error when trying to create a virtual environment with certain base interpreters.   \nBase interpreters that work:\n\nPython 3.6 32-bit\nPython 2.7, 64-bit\nAnaconda 5.0.1 (2.7, 64-bit)\n\nBase interpreters that give error:\n\nAnaconda 5.0.1 (3.6, 64-bit)\nPython 3.6 64-bit\n\nThe error:\n\nError: Command '['F:\\OneDrive\\Visual Studio 2017 Projects\\Web Test\\DjangoWebProject1\\DjangoWebProject1\\env4\\Scripts\\python.exe', '-Im', 'ensurepip', '--upgrade', '--default-pip']' returned non-zero exit status 1.\n  Virtual environment was not created at 'F:\\OneDrive\\Visual Studio 2017 Projects\\Web Test\\DjangoWebProject1\\DjangoWebProject1\\env4'. Exit code: 1\n  Virtual environment was not created at 'F:\\OneDrive\\Visual Studio 2017 Projects\\Web Test\\DjangoWebProject1\\DjangoWebProject1\\env4'","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1119,"Q_Id":53245974,"Users Score":0,"Answer":"Turns out this was a known issue with previous versions of Anaconda.  The Python 3.6 64-bit interpreter that was listed as giving an error was actually an Anaconda version of Python as well.  \nSimply using the package manager to upgrade to the most recent versions of Anaconda fixed the issues.","Q_Score":0,"Tags":"python,visual-studio,virtual-environment","A_Id":53559921,"CreationDate":"2018-11-11T04:57:00.000","Title":"Creating python virtual environment in Visual Studio fails: returned non-zero exit status 1","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I use wxpython (phoenix) as frontend and wx.lib.pubsub to manage the inter-module (and inter-package) messaging in my program. I currently use the module dill to save and load the program state.\nI only use the sendMessage and the subscribe methods, no fancy tricking here.\nIf I stay in the same session, that is, I build the model and modify it without saving and reloading the model, all works fine.\nHowever, when restarting the GUI and starting a session from a saved file, part of the messaging that worked previously OK, fails: the messages are sent, but the receiver does not get them. \nWhen directly calling the methods that should have been called on the receiver side, all works great, regardless of the session.\nDue to the complexity of the problem I can't really provide an example, but would appreciate any effort for clarification or shared similar experiences.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":13,"Q_Id":53246911,"Users Score":0,"Answer":"To kind of answer my own question: after trying to reproduce the issue in toy problems unsuccesfully followed by lenghty debugging the source of the problem was found to be the way certain properties were set, namely using property.setters. These have been replaced by set_ methods and the issue was resolved.\nI know this question and also the answer are well below the expected SO standard, feel free to downvote.","Q_Score":0,"Tags":"python-3.x,dill,wxpython","A_Id":53283137,"CreationDate":"2018-11-11T08:10:00.000","Title":"wxpython pubsub fails after loading from dill","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I\u2019m currently working on a Raspberry Pi\/Django project slightly more complex that i\u2019m used to. (i either do local raspberry pi projects, or simple Django websites; never the two combined!)\nThe idea is two have two Raspberry Pi\u2019s collecting information running a local Python script, that would each take input from one HDMI feed (i\u2019ve got all that part figured out - I THINK) using image processing. Now i want these two Raspberry Pi\u2019s (that don\u2019t talk to each other) to connect to a backend server that would combine, store (and process) the information gathered by my two Pis\nI\u2019m expecting each Pi to be working on one frame per second, comparing it to the frame a second earlier (only a few different things he is looking out for) isolate any new event, and send it to the server. I\u2019m therefore expecting no more than a dozen binary timestamped data points per second.\nNow what is the smart way to do it here ? \n\nDo i make contact to the backend every second? Every 10 seconds?\nHow do i make these bulk HttpRequests ? Through a POST request? Through a simple text file that i send for the Django backend to process? (i have found some info about \u201cbulk updates\u201d for django but i\u2019m not sure that covers it entirely)\nHow do i make it robust? How do i make sure that all data what successfully transmitted before deleting the log locally ? (if one call fails for a reason, or gets delayed, how do i make sure that the next one compensates for lost info?\n\nBasically, i\u2019m asking advise for making a IOT based project, where a sensor gathers bulk information and want to send it to a backend server for processing, and how should that archiving process be designed.\nPS: i expect the image processing part (at one fps) to be fast enough on my Pi Zero (as it is VERY simple); backlog at that level shouldn\u2019t be an issue.\nPPS: i\u2019m using a django backend (even if it seems a little overkill) \n    a\/ because i already know the framework pretty well\n    b\/ because i\u2019m expecting to build real-time performance indicators from the combined data points gathered, using django, and displaying them in (almost) real-time on a webpage.\nThank you very much !","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":1234,"Q_Id":53249599,"Users Score":2,"Answer":"This partly depends on just how resilient you need it to be. If you really can't afford for a single update to be lost, I would consider using a message queue such as RabbitMQ - the clients would add things directly to the queue and the server would pop them off in turn, with no need to involve HTTP requests at all.\nOtherwise it would be much simpler to just POST each frame's data in some serialized format (ie JSON) and Django would simply deserialize and iterate through the list, saving each entry to the db. This should be fast enough for the rate you describe - I'd expect saving a dozen db entries to take significantly less than half a second - but this still leaves the problem of what to do if things get hung up for some reason. Setting a super-short timeout on the server will help, as would keeping the data to be posted until you have confirmation that it has been saved - and creating unique IDs in the client to ensure that the request is idempotent.","Q_Score":1,"Tags":"python,django,raspberry-pi,iot,bulk-load","A_Id":53249964,"CreationDate":"2018-11-11T14:15:00.000","Title":"Sending data to Django backend from RaspberryPi Sensor (frequency, bulk-update, robustness)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Im trying to get flask with virtual environment and wsgi configured to work but Apache keeps giving me this error: \n\n[Tue Nov 13 13:23:55.179153 2018] [wsgi:error] [pid 11819] [x.x.x.x:xxxx]     app.session_interface = self._get_interface(app)\n[Tue Nov 13 13:23:55.179160 2018] [wsgi:error] [pid 11819] [x.x.x.x:xxxx]   File \"\/var\/www\/html\/project\/python\/lib\/python3.6\/site-packages\/flask_session\/init.py\",\n  line 93, in _get_interface\n[Tue Nov 13 13:23:55.179163 2018] [wsgi:error] [pid 11819] [x.x.x.x:xxxx]     config['SESSION_USE_SIGNER'], config['SESSION_PERMANENT'])\n[Tue Nov 13 13:23:55.179169 2018] [wsgi:error] [pid 11819] [x.x.x.x:xxxx]   File \"\/var\/www\/html\/project\/python\/lib\/python3.6\/site-packages\/flask_session\/sessions.py\",\n  line 314, in init\n[Tue Nov 13 13:23:55.179172 2018] [wsgi:error] [pid 11819] [x.x.x.x:xxxx]     self.cache = FileSystemCache(cache_dir, threshold=threshold, mode=mode)\n[Tue Nov 13 13:23:55.179177 2018] [wsgi:error] [pid 11819] [x.x.x.x:xxxx]   File \"\/var\/www\/html\/project\/python\/lib\/python3.6\/site-packages\/werkzeug\/contrib\/cache.py\",\n  line 717, in init\n[Tue Nov 13 13:23:55.179180 2018] [wsgi:error] [pid 11819] [x.x.x.x:xxxx]     os.makedirs(self._path)\n[Tue Nov 13 13:23:55.179185 2018] [wsgi:error] [pid 11819] [x.x.x.x:xxxx]   File \"\/lib64\/python3.6\/os.py\", line 220, in makedirs\n[Tue Nov 13 13:23:55.179188 2018] [wsgi:error] [pid 11819] [x.x.x.x:xxxx]     mkdir(name, mode)\n[Tue Nov 13 13:23:55.179215 2018] [wsgi:error] [pid 11819] [x.x.x.x:xxxx] PermissionError: [Errno 13] Permission denied: '\/flask_session'\n\nI tried giving the project different permissions but nothing worked","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1157,"Q_Id":53282275,"Users Score":0,"Answer":"You should specify which type of session interface to use.\nTry to set the SESSION-TYPE to \"null\".","Q_Score":2,"Tags":"python,apache,flask,wsgi,flask-session","A_Id":59171814,"CreationDate":"2018-11-13T13:38:00.000","Title":"Apache showing Permission denied: flask_session error","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Im trying to get flask with virtual environment and wsgi configured to work but Apache keeps giving me this error: \n\n[Tue Nov 13 13:23:55.179153 2018] [wsgi:error] [pid 11819] [x.x.x.x:xxxx]     app.session_interface = self._get_interface(app)\n[Tue Nov 13 13:23:55.179160 2018] [wsgi:error] [pid 11819] [x.x.x.x:xxxx]   File \"\/var\/www\/html\/project\/python\/lib\/python3.6\/site-packages\/flask_session\/init.py\",\n  line 93, in _get_interface\n[Tue Nov 13 13:23:55.179163 2018] [wsgi:error] [pid 11819] [x.x.x.x:xxxx]     config['SESSION_USE_SIGNER'], config['SESSION_PERMANENT'])\n[Tue Nov 13 13:23:55.179169 2018] [wsgi:error] [pid 11819] [x.x.x.x:xxxx]   File \"\/var\/www\/html\/project\/python\/lib\/python3.6\/site-packages\/flask_session\/sessions.py\",\n  line 314, in init\n[Tue Nov 13 13:23:55.179172 2018] [wsgi:error] [pid 11819] [x.x.x.x:xxxx]     self.cache = FileSystemCache(cache_dir, threshold=threshold, mode=mode)\n[Tue Nov 13 13:23:55.179177 2018] [wsgi:error] [pid 11819] [x.x.x.x:xxxx]   File \"\/var\/www\/html\/project\/python\/lib\/python3.6\/site-packages\/werkzeug\/contrib\/cache.py\",\n  line 717, in init\n[Tue Nov 13 13:23:55.179180 2018] [wsgi:error] [pid 11819] [x.x.x.x:xxxx]     os.makedirs(self._path)\n[Tue Nov 13 13:23:55.179185 2018] [wsgi:error] [pid 11819] [x.x.x.x:xxxx]   File \"\/lib64\/python3.6\/os.py\", line 220, in makedirs\n[Tue Nov 13 13:23:55.179188 2018] [wsgi:error] [pid 11819] [x.x.x.x:xxxx]     mkdir(name, mode)\n[Tue Nov 13 13:23:55.179215 2018] [wsgi:error] [pid 11819] [x.x.x.x:xxxx] PermissionError: [Errno 13] Permission denied: '\/flask_session'\n\nI tried giving the project different permissions but nothing worked","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1157,"Q_Id":53282275,"Users Score":0,"Answer":"The directory is failing to be created is on behalf of flask-session, which has a SESSION_FILE_DIR setting that'll let you override its default. Point that to some place with the appropriate permissions, and you'll likely be fine.","Q_Score":2,"Tags":"python,apache,flask,wsgi,flask-session","A_Id":53286630,"CreationDate":"2018-11-13T13:38:00.000","Title":"Apache showing Permission denied: flask_session error","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am completely new to django, but I am trying to change a database table. I read a good amount of post about running \npython manage.py makemigrations\npython manage.py migrate\nBut when I run these two command, it does not detect any changes. A solution has been to change the models.py but I do not have that file. (I jumped aboard a working project, which appears to only have initialize the database once at the very beginning. I want to add a column to my .sql file which is copied from an .csv\nCREATE TABLE test (\ncolumns\n...\norgan_system text <-adding only this line\n...\nmore columns);\n\/COPY test FROM 'test.csv' DELIMITER ',' CSV HEADER;\nI have no clue on where to start\/go.\nThe init.py file is completely empty if that means anything.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":78,"Q_Id":53289632,"Users Score":1,"Answer":"it's normal for the __init__.py file to be empty. if you're missing a models.py file though something is a bit iffy as that is what django uses to talk to the database\nyou are correct that in order to make changes to the database you would have to modify models.py","Q_Score":0,"Tags":"python,sql,django","A_Id":53289650,"CreationDate":"2018-11-13T21:18:00.000","Title":"django column does not exist but no models.py and no changes found","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"This app is working fine on heroku but how do i configure it on godaddy using custom domain.\nWhen i navigate to custom domain, it redirects to mcc.godaddy.com.\nWhat all settings need to be changed.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":121,"Q_Id":53311456,"Users Score":0,"Answer":"The solution is to add a correct CNAME record and wait till the value you entered has propagated.\nGo to DNS management and make following changes:\nIn the 'Host' field enter 'www' and in 'Points to' field add 'yourappname.herokuapp.com'","Q_Score":0,"Tags":"python,heroku,dns,hosting,custom-domain","A_Id":53688750,"CreationDate":"2018-11-15T02:12:00.000","Title":"How do I configure settings for my Python Flask app on GoDaddy","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We suddenly started getting this issue when compressing django static files on production servers. Ubuntu 16.04, Python 3.x, Django 1.11. I am using an ansible-playbook to deploy.\nThe error is as follows:\nCommandError: An error occurred during rendering \/chalktalk\/app\/chalktalk-react-40\/chalktalk-react-40\/chalktalk\/apps\/exams\/templates\/exams\/section-edit.html: Invalid input of type: 'CacheKey'. Convert to a byte, string or number first.\nIt doesn't seem to be an issue in one of the static files but a general issue. Every time we run it, we get a different file.\nI was looking for any clues on google and nothing shows up with the same error.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":3229,"Q_Id":53331405,"Users Score":0,"Answer":"Try installing redis-py below version 3","Q_Score":10,"Tags":"python,django,ansible,django-compressor","A_Id":53336030,"CreationDate":"2018-11-16T04:21:00.000","Title":"Django compress error: Invalid input of type: 'CacheKey'","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using Heropy. My topology looks the next way:\nSpout1 -> Bolt1 - > Bolt2\nSpout2     ---------> Bolt2\nSo, Bolt2 needs info from both Spout2 and Bolt1 in order to emit the result, however the info from Spout2 comes faster than the info from Bolt1 and Bolt2 has to wait until if has both Spout2 and Bolt1 info. How can I sync information flow using Heron API so that Bolt2 emits the result only after all the info available?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":31,"Q_Id":53339982,"Users Score":0,"Answer":"In general the order\/synchronization is not guaranteed in streaming. It is hard for spout1 and spout2 themselves to be 100% synchronized I feel.\nI am thinking there is one options you might consider: hooking bolt1 to spout2 and emiting the tuples from spout2 directly, disconnecting bolt2 from spout2. So that bolt1 becomes the source of truth of the ordering.\nWindowing might be another option, but it requires more considerations and works.","Q_Score":0,"Tags":"python,heron","A_Id":53343390,"CreationDate":"2018-11-16T14:40:00.000","Title":"Sync severals spouts and bolt in Heron","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using Heropy. My topology looks the next way:\nSpout1 -> Bolt1 - > Bolt2\nSpout2     ---------> Bolt2\nSo, Bolt2 needs info from both Spout2 and Bolt1 in order to emit the result, however the info from Spout2 comes faster than the info from Bolt1 and Bolt2 has to wait until if has both Spout2 and Bolt1 info. How can I sync information flow using Heron API so that Bolt2 emits the result only after all the info available?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":31,"Q_Id":53339982,"Users Score":0,"Answer":"Heron doesn't synchronize tuples from different components automatically. So you will need to buffer the tuples from Spout2 and wait until the corresponding tuples from Bolt1 arrive, then do the computation.","Q_Score":0,"Tags":"python,heron","A_Id":53345766,"CreationDate":"2018-11-16T14:40:00.000","Title":"Sync severals spouts and bolt in Heron","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Autoescape is set to false globally. Is there a way to tell Jinja2 to escape a specific template?\nThe {% autoescape false %} block apparently only works for disabling autoescape in templates if the global settings is set to true and not the other way around.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":636,"Q_Id":53341853,"Users Score":0,"Answer":"Which version of Jinja2 are you using? Is it used on a Flask\/Django context or something else?\nI tested with Flask==1.1.1 and Jinja2==2.10.1 and what I observed is that autoescape is enabled by default when using render_template.","Q_Score":0,"Tags":"python,escaping,jinja2","A_Id":57424764,"CreationDate":"2018-11-16T16:27:00.000","Title":"Jinja2 autoescape","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am developing an application in which I am explicitly using memcache with Google Appengine's NDB library. I want something like this.\n1) Get 100 records from datastore and put them in memcache.\n2) Now whenever user wants these records I would get these records from memcache instead of datastore.\n3) I would invalidate the memcache if there is a new record in datastore and then populate the memcache with 101 records.\nI am thinking of an approach like I compare the number of records in memcache and datastore and if there is a difference, I would update the memcache.\nBut if we see documentation of NDB, we can only get count by retrieving all the records, and this is not required as datastore query is not being avoided in this way.\nAny help anyone? Or any different approach I could go with?\nThanks in advance.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":82,"Q_Id":53350054,"Users Score":0,"Answer":"Rather than relying on counts, you could give each record a creation timestamp, and keep the most recent timestamp in memcache. Then to see if there are new records you just need to check if there are any timestamps newer than that, which assuming you have an index on that field is a very quick query.","Q_Score":0,"Tags":"django,python-2.7,nosql,app-engine-ndb,google-app-engine-python","A_Id":53350546,"CreationDate":"2018-11-17T09:52:00.000","Title":"Best way to count number of records from NDB library","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I just installed Graphene on my Django project and would like to use it also for the back-end, templating. So far, I find just tutorials how to use it only for front-end, no mention about back-end. \n\nShould I suppose that it is not a good idea to use it instead of a SQL database? If yes, then why? Is there a downside in the speed in the comparison to a SQL databases like MySQL?\nWhat's the best option how to retrieve the data for templates in Python? I mean, best for the performance.\n\nThnx.","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":229,"Q_Id":53351156,"Users Score":2,"Answer":"GraphQL is an API specification.  It doesn't specify how data is stored, so it is not a replacement for a database.\nIf you're using GraphQL, you don't use Django templates to specify the GraphQL output, because GraphQL specifies the entire HTTP response from the web service, so this question doesn't make sense.","Q_Score":2,"Tags":"python,django,django-templates,graphql,graphene-python","A_Id":53380130,"CreationDate":"2018-11-17T12:15:00.000","Title":"GraphQL\/Graphene for backend calls in Django's templates","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm reading on the WSGI specification, and tried implementing a simple WSGI server from scratch, and tested it on a simple flask application. Currently it\n\nopens a socket listener\npasses each incoming connection to another thread to handle it\nthe handler parses the request, creates the environ, passes it to the flask app object, and returns the response.\n\nOverall, it seems to work. Conceptually, what more does a real server, eg. gunicorn do? I'm asking in terms of the basic functionality, not in terms of supporting more features (eg. different protocols). What makes a server better, eg. why is gunicorn suitable for production, but wsgiref is not?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":36,"Q_Id":53354372,"Users Score":1,"Answer":"my 2c, is that getting something working is pretty easy, it's just that HTTP is such an old\/complex standard it takes a lot of work to get all the edge cases working nicely\n\nhow well does it tolerate errors in the WSGI client code\nHTTP 0.9, 1.0, 1.1 or 2\/SPDY?\nhow do you handle malicious clients that send a byte every 10 seconds\nthe various Keep-Alive and Tranfer-Encoding variants seems to end up consuming a lot of code\ndoes it do Content-Encoding as well","Q_Score":1,"Tags":"python,server,uwsgi","A_Id":53355376,"CreationDate":"2018-11-17T18:43:00.000","Title":"What does a wsgi server consist of?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Using Windows\nLearning about virtualenv. Here is my understanding of it and a few question that I have. Please correct me if my understanding is incorrect. \nvirtualenv are environments where your pip dependencies and its selected version are stored for a particular project. A folder is made for your project and inside there are the dependencies. \n\nI was told you would not want to save your .py scripts in side of virtual ENV, if that's the case how do I access the virtual env when I want to run that project? Open it up in the command line under source ENV\/bin\/activate then cd my way to where my script is stored?\nBy running pip freeze that creates a requirements.txt file in that project folder that is just a txt. copy of the dependencies of that virtual env? \nIf I'm in a second virutalenv who do I import another virtualenv's requirements? I've been to the documentation but I still don't get it.\n$ env1\/bin\/pip freeze > requirements.txt\n$ env2\/bin\/pip install -r requirements.txt\n\nGuess I'm confused on the \"requirements\" description. Isn't best practice to always call our requirements, requirements.txt? If that's the case how does env2 know I'm want env1 requirements? \nThank you for any info or suggestions. Really appreciate the assistance.\nI created a virtualenv  C:\\Users\\admin\\Documents\\Enviorments>virtualenv django_1 \nUsing base prefix'c:\\\\users\\\\admin\\\\appdata\\\\local\\\\programs\\\\python\\\\python37-32' \nNew python executable in C:\\Users\\admin\\Documents\\Enviorments\\django_1\\Scripts\\python.exe Installing setuptools, pip, wheel...done.\nHow do I activate it? source django_1\/bin\/activate doesn't work?\nI've tried: source C:\\Users\\admin\\Documents\\Enviorments\\django_1\/bin\/activate Every time I get : 'source' is not recognized as an internal or external command, operable program or batch file.","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":104,"Q_Id":53356442,"Users Score":0,"Answer":"* disclaimer * I mainly use conda environments instead of virtualenv, but I believe that most of this is the same across both of them and is true to your case.\n\nYou should be able to access your scripts from any environment you are in. If you have virtenvA and virtenvB then you can access your script from inside either of your environments. All you would do is activate one of them and then run python \/path\/to\/my\/script.py, but you need to make sure any dependent libraries are installed. \nCorrect, but for clarity the requirements file contains a list of the dependencies by name only. It doesn't contain any actual code or packages. You can print out a requirements file but it should just be a list which  says package names and their version numbers. Like pandas 1.0.1    numpy 1.0.1   scipy 1.0.1 etc.\nIn the lines of code you have here you would export the dependencies list of env1 and then you would install these dependencies in env2. If env2 was empty then it will now just be a copy of env1, otherwise it will be the same but with all the packages of env1 added and if it had a different version number of some of the same packages then this would be overwritten","Q_Score":1,"Tags":"python,python-3.x,virtualenv","A_Id":53356590,"CreationDate":"2018-11-17T23:12:00.000","Title":"virtualenv - Birds Eye View of Understanding","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Using Windows\nLearning about virtualenv. Here is my understanding of it and a few question that I have. Please correct me if my understanding is incorrect. \nvirtualenv are environments where your pip dependencies and its selected version are stored for a particular project. A folder is made for your project and inside there are the dependencies. \n\nI was told you would not want to save your .py scripts in side of virtual ENV, if that's the case how do I access the virtual env when I want to run that project? Open it up in the command line under source ENV\/bin\/activate then cd my way to where my script is stored?\nBy running pip freeze that creates a requirements.txt file in that project folder that is just a txt. copy of the dependencies of that virtual env? \nIf I'm in a second virutalenv who do I import another virtualenv's requirements? I've been to the documentation but I still don't get it.\n$ env1\/bin\/pip freeze > requirements.txt\n$ env2\/bin\/pip install -r requirements.txt\n\nGuess I'm confused on the \"requirements\" description. Isn't best practice to always call our requirements, requirements.txt? If that's the case how does env2 know I'm want env1 requirements? \nThank you for any info or suggestions. Really appreciate the assistance.\nI created a virtualenv  C:\\Users\\admin\\Documents\\Enviorments>virtualenv django_1 \nUsing base prefix'c:\\\\users\\\\admin\\\\appdata\\\\local\\\\programs\\\\python\\\\python37-32' \nNew python executable in C:\\Users\\admin\\Documents\\Enviorments\\django_1\\Scripts\\python.exe Installing setuptools, pip, wheel...done.\nHow do I activate it? source django_1\/bin\/activate doesn't work?\nI've tried: source C:\\Users\\admin\\Documents\\Enviorments\\django_1\/bin\/activate Every time I get : 'source' is not recognized as an internal or external command, operable program or batch file.","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":104,"Q_Id":53356442,"Users Score":0,"Answer":"virtualenv simply creates a new Python environment for your project. Think of it as another copy of Python that you have in your system. Virutual environment is helpful for development, especially if you will need different versions of the same libraries.\nAnswer to your first question is, yes, for each project that you use virtualenv, you need to activate it first. After activating, when you run python script, not just your project's scripts, but any python script, will use dependencies and configuration of the active Python environment.\nAnswer to the second question, pip freeze > requirements.txt will create requirements file in active folder, not in your project folder. So, let's say in your cmd\/terminal you are in C:\\Desktop, then the requirements file will be created there. If you're in C\\Desktop\\myproject folder, the file will be created there. Requirements file will contain the packages installed on active virtualenv.\nAnswer to 3rd question is related to second. Simply, you need to write full path of the second requirements file. So if you are in first project and want to install packages from second virtualenv, you run it like env2\/bin\/pip install -r \/path\/to\/my\/first\/requirements.txt. If in your terminal you are in active folder that does not have requirements.txt file, then running pip install will give you an error. So, running the command does not know which requirements file you want to use, you specify it. \nI created a virtualenv \nC:\\Users\\admin\\Documents\\Enviorments>virtualenv django_1 Using base prefix 'c:\\\\users\\\\admin\\\\appdata\\\\local\\\\programs\\\\python\\\\python37-32' New python executable in C:\\Users\\admin\\Documents\\Enviorments\\django_1\\Scripts\\python.exe Installing setuptools, pip, wheel...done. \nHow do I activate it? source django_1\/bin\/activate doesn't work? \nI've tried: source C:\\Users\\admin\\Documents\\Enviorments\\django_1\/bin\/activate Every time I get : 'source' is not recognized as an internal or external command, operable program or batch file.","Q_Score":1,"Tags":"python,python-3.x,virtualenv","A_Id":53356656,"CreationDate":"2018-11-17T23:12:00.000","Title":"virtualenv - Birds Eye View of Understanding","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm making API server with python flask.\nIn my case, it is real production level, So I have to be careful when developing server.\nAfter google searching, found that celery&redis is suitable for task queueing.\nSo I installed celery&redis via pip3 install 'celery[redis]' and defined task, and run.\nEverything was fine, but I got some question about it.\nAssume that there is user model. Maybe CRUD for user model like this.\n\nRegister user(with photo)\nDelete user\nGet a single user\n\nIn my personal think, only Register user need to celery&redis.\nBecause upload photo can take long time, so it have to treated with asynchronize work.\nDelete user and Get a slngle user just query to db and retreive it.\nSo it doesn't takes longer time. (it means, do not need to work with celery)\nIt is right? Or, any missing feature I do not know?\nTo summarize my question, I want to know that is there any standard for celery?\nThanks!","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":65,"Q_Id":53369400,"Users Score":0,"Answer":"You have it about right.  You can put whatever processing you want in celery, but the rule that you just used--use celery for things that take a long time--is the one we use most in our production environment.  You can also use celery when you want to scale out an operation across servers more easily.  For example, when scraping a large number of pages, you might want to execute that in parallel to speed up what would otherwise be a long-running task.","Q_Score":0,"Tags":"python,flask,redis,celery","A_Id":53424766,"CreationDate":"2018-11-19T06:31:00.000","Title":"python celery for every work is efficient?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am writing a Python script to monitor the status of a certain websites and report if any error via email notification.\nI am able to test the http status of the websites and websphere console urls.\nSince the admin (console) is on DMGR , my code is able to check the status of only DMGR but not the nodes inside the DMGR ,whenever few env is down .. only node goes down. I need a way to monitor the node's status as well.\nAny help would be appreciated.\nThanks","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":71,"Q_Id":53378777,"Users Score":0,"Answer":"You application will be deployed to the JVMs on the nodes. \nIs your application configured to be accessible via the Node hostname [check virtualHost config]?\nif yes - thats the url, you need to check.","Q_Score":0,"Tags":"python-3.x,websphere,monitor,email-notifications","A_Id":53408409,"CreationDate":"2018-11-19T16:20:00.000","Title":"Websphere -check the status of nodes from a browser for automation purpose | Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a google sheet with a filter\/query that only shows the data that verifies the filter's conditions. To retrieve the data for python I use gspread, but hiddenrows are appearing too (as if there was no filter at all).\nHow can I differentiate the rows selected from the ones who weren't?\nI don't understand if this can work without adding more functions to gspread, or if I need to create a new function. If so, what should the function be?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":370,"Q_Id":53379784,"Users Score":2,"Answer":"I found that function fetch_sheet_metadata() which is inside class spreadsheet of gspread gives out the filters and hiddenValues for each filter, which is enough to solve my problem.","Q_Score":1,"Tags":"python,google-sheets-api,gspread,google-sheets-query","A_Id":53410194,"CreationDate":"2018-11-19T17:26:00.000","Title":"gspread: Retrieve Filtered Data from GoogleSheets","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it possible to make asynchronous calls to a stored procedure in VoltDB (an insert in a custom Java Stored procedure) using the Python client?\nIt looks like it isn't supported but is there a way to not wait for the response, or will I have to move to the Java client for async support?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":233,"Q_Id":53381017,"Users Score":0,"Answer":"The VoltDB python client does not support asynchronous calls. It may be possible to make calls from a multi-threaded python application, but we've never tested that, so I don't want to lead you into uncharted waters.\nThe java, C++, and Go clients support asynchronous calls.\nIf you're mainly trying to do fast inserts, you might leverage csvloader and you could probably execute csvloader from within a python application, but that's probably not what you're looking to do.\nDisclosure: I work at VoltDB.","Q_Score":0,"Tags":"python,asynchronous,voltdb","A_Id":53382230,"CreationDate":"2018-11-19T18:59:00.000","Title":"Is it possible to make asynchronous stored procedure calls to VoltDB using the Python client","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using the google cloud platform app engine to have a main python file serve up a website using flask and a route in that file that will call a python function that is kept in a secondary python file. Whenever I try to call the function via the website I get a module error. Is there any way for me to upload this file alongside main.py so that I can call functions in it without just copying the file to main.py. Also I checked in each bucket and could not see any of my files in any of them but is there a bucket I should upload it to.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":47,"Q_Id":53384553,"Users Score":0,"Answer":"As I understand, you are calling from the main.py file in an App Engine application to a function developed by you in a secondary file. If you want that, is as simple as adding the file in the same folder of your main.py and then you have to deploy your application. Then, all the files of the folder will be uploaded to your App Engine application.","Q_Score":1,"Tags":"python,python-3.x,google-cloud-platform","A_Id":53391185,"CreationDate":"2018-11-20T00:28:00.000","Title":"How do I upload a secondary python file to google cloud platform?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have to run pdf2image on my Python Lambda Function in AWS, but it requires poppler and poppler-utils to be installed on the machine. \nI have tried to search in many different places how to do that but could not find anything or anyone that have done that using lambda functions.\nWould any of you know how to generate poppler binaries, put it on my Lambda package and tell Lambda to use that?\nThank you all.","AnswerCount":5,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":6645,"Q_Id":53403399,"Users Score":0,"Answer":"Hi @Alex Albracht thanks for compiled easy instructions! They helped a lot. But I really struggled with getting the lambda function find the poppler path. So, I'll try to add that up with an effort to make it clear.\nThe binary files should go in a zip folder having structure as:\npoppler.zip -> bin\/poppler\nwhere poppler folder contains the binary files. This zip folder can be then uploaded as a layer in AWS lambda.\nFor pdf2image to work, it needs poppler path. This should be included in the lambda function in the format - \"\/opt\/bin\/poppler\".\nFor example,\npoppler_path = \"\/opt\/bin\/poppler\"\npages = convert_from_path(PDF_file, 500, poppler_path=poppler_path)","Q_Score":8,"Tags":"python,aws-lambda,poppler","A_Id":62793956,"CreationDate":"2018-11-20T23:58:00.000","Title":"How to install Poppler to be used on AWS Lambda","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Python script written up and the output of this script is a list. \nRight now I need to get it online and make it accessible to others. I looked at Django , but then I realized that it may be kind of hard to create the UI. Is there any simple way to create a UI in Django and map it to an existing Python script.\nRight now I using nltk, numpy, sqlite3 and things like that. Or is there a simpler way by which I can proceed?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":32,"Q_Id":53412863,"Users Score":0,"Answer":"In your case, Django is redundant.\nYou can use something smaller, Flask or maybe Aiohttp.\nFor example, all you need in aiohttp:\nbasic hmtl template\nhandler for one url (here you will call your script)\naiohttp webserver  \nThe main idea:\nYour server catch some url (for example \/),\nstart your script, receives result,\nrespond with your html template (also render script result in it).","Q_Score":0,"Tags":"python","A_Id":53413477,"CreationDate":"2018-11-21T13:13:00.000","Title":"Publish a script online","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am just starting out on using the django framework. One thing that bugs me is the django-admin utility. Is it part of the python installation or is it part of the django installation through pip?\nThe way I've been doing my projects is\n\nMake a virtual Environment.\nCreate a django project in the environment through django-admin.\nand then I just install the django framework using pip inside the environment.\n\nMy question arises because inside the virtual environment, I used django-admin to create the project before installing the framework.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":164,"Q_Id":53420474,"Users Score":0,"Answer":"I have ran into something similar. Where in a virtual enviroment I create for python 3 used my global python 2 installation. Try creating a new virtual environment just like before, and this time try using \"python django-admin\" instead of just \"django-admin\". A question for you, is this a Windows environment, I ask because that is the only environment I have witnessed this behavior in. I believe by using \"python django-admin\" it will force it to use the virtualenv's sandboxed python.","Q_Score":1,"Tags":"python,django","A_Id":53420676,"CreationDate":"2018-11-21T21:06:00.000","Title":"Is django-admin part of python or django installation?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Environments\npc: mac os 10.13.1\nVersions\npython: 3.6.2\nmezzanine: 4.3.1\ndjango: 1.11.16\nbootstrap: 3.3.5  (confirmed in \/{my_name}\/anaconda3\/lib\/python3.6\/site-packages\/mezzanine\/core\/static\/css\/bootstrap.css)\n\nHere, my mezzanine project has base.html for site interface. There is the code to get the css-code(design). That is bootstrap.css.\nBut the bootstrap.css relies to bootstrap3(3.3.5), and I have to use bootstrap4(4.0.0). (This is my boss's order.)\nThen, I wanna get(download) bootstrap4, put it to right directory and change bootstrap dependency by linking to the directory which I put earlier.\nHow should I achieve it?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":123,"Q_Id":53425743,"Users Score":0,"Answer":"This might break your things all the classes which are obsoleted will not work in newer version to get prevent this refactor all view files . Simple Solution is change the file in  static\/ and import the partials header or footer file linked","Q_Score":0,"Tags":"python,css,django,mezzanine","A_Id":53426109,"CreationDate":"2018-11-22T07:22:00.000","Title":"How do I upgrade bootstrap in my mezzanine's project?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to use the AWS IoT basicPubSub.py script to test my AWS connection, but I keep getting this error. I have tried various fixes, but cannot resolve the problem. \nI have tried it using my MacBook and RPi and still have the same issue.\nssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:720)","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":445,"Q_Id":53431396,"Users Score":0,"Answer":"I am not sure how I managed to fix this problem, I tried the following items to fix the problem:\nRe-created all the certificates\nRe-installated CLI using sudo\nInstalled ssl (sudo apt-get install -y libssl-dev)\nI going to do a fresh installation on my RPi and repeat the steps to understand how this was resolved and fixed.","Q_Score":0,"Tags":"python,python-3.x,amazon-web-services,ssl,ssl-certificate","A_Id":53579254,"CreationDate":"2018-11-22T12:47:00.000","Title":"SSL error - certificate verify failed - AWS IOT (basicPubSub.py)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Actually rather than just code , I want to know all the topics I have to study for making a remember me key on my login page.\nIts a inbuilt django login page and i have a bit knowledge of sessions and cache but not enough for making a remember me key and havent user caching yet.\nIf you can supply me with a answer or a source , that will be helpful","AnswerCount":5,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":9246,"Q_Id":53431476,"Users Score":0,"Answer":"I have an idea which is by adding another filed like below:\nsecret_code = models.CharField(max_length=6)\nThe main idea behind using the secret_code filed is to recover your username & password in login page. \nAlso i have thinking about another idea which is by storing your MAC address or IP address automatically but this is not going to work if you had switched to login from another device.","Q_Score":4,"Tags":"python,django,caching,login,web-deployment","A_Id":61170810,"CreationDate":"2018-11-22T12:52:00.000","Title":"Django : How can I implement a remember me key on my login page","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm having problems running Django. I installed it with pip3 and then it says:\n\nThe script django-admin is installed in\n  '\/Library\/Frameworks\/Python.framework\/Versions\/3.5\/bin' which is not\n  on PATH.\n\nSo I tried to modify my PATH in the bash.profile like this:\n\nexport DJANGO=\/Library\/Frameworks\/Python.framework\/Versions\/3.5\/bin\n\nThis did not help so as I ran in terminal: \n\ndjango-admin.py startproject firstdjango\n\nit just says:\n\n-bash: django-admin.py: command not found\n\nI don't know what to do to make it work. Any ideas?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2199,"Q_Id":53445932,"Users Score":0,"Answer":"create a Directory somewhere, lets name it \"Django\"\ncd to \"Django\" directory\ncreate virtualenv --> virtualenv django\nsource django\/bin\/activate\ninstall django --> pip3 install django\ncd to created 'django' directory\ndjango-admin startproject first_project\nEnjoy!","Q_Score":1,"Tags":"python,django,python-3.x","A_Id":53446560,"CreationDate":"2018-11-23T11:33:00.000","Title":"Django is installed but python3 does not find it","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've an application running quite a long time ago with python 2.6.6 and Django 1.4.5. It' s running on apache2 and Debian (of course it uses virtualenv).\nI' d like to add another application to that server, but with python 3.4.5 and Django 1.9(+).\nThey'd have of course a different virtualenvironment, even a different domain, however, I' d like them to use the same DB.\nMy question would what kind of complications will I face? For instance different table layout for Django tables, no south anymore, but migrate, etc. Are these problems even overcomeable?\nThanks.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":61,"Q_Id":53452342,"Users Score":0,"Answer":"WLOG, assume application #1 is the python 2.6.6 + django 1.4 app\n      assume application #2 is the python 3.4 + django 1.9 app\nThese problems are 100% overcomeable, it just that application #2 (the one with python 3.4.5) will have to treat application #1's database as unmanaged.  You can create the unmanaged models you'd need from application #1's database by using the inspectdb command.  Good luck!","Q_Score":0,"Tags":"django,python-3.x,python-2.7,virtualenv","A_Id":53455874,"CreationDate":"2018-11-23T19:59:00.000","Title":"Django and python - different versions","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to add a real-time chart to my Flask webapp. This chart, other than current updated data, should contain historical data too.\nAt the moment i can create the chart and i can make it real time but i have no idea how to make the data 'persistent', so i can't see what the chart looked like days or weeks ago.\nI'm using a Javascript charting library, while Data is being sent from my Flask script, but what it's not really clear is how i can \"store\" my data on Javascript. At the moment, indeed, the chart will reset each time the page is loaded.\nHow would it be possible to accomplish that? Is there an example for it?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":89,"Q_Id":53453643,"Users Score":0,"Answer":"You can try to store the data in a database and or in a file and extract from there .\nYou can also try to use dash or you can make on the right side a menu with dates like 21 september and see the chart from that day .\nFor dash you can look on YouTube at Sentdex","Q_Score":0,"Tags":"javascript,python,flask","A_Id":53487472,"CreationDate":"2018-11-23T22:49:00.000","Title":"How can i create a persistent data chart with Flask and Javascript?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Google Colaboratory Notebook for Data Analysis that I want to output as a HTML file as currently not everything loads within the Colab environment such as large Folium Heatmaps. Is it possible to export the notebook as a html file as opposed to the ipynb and py options?","AnswerCount":5,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":48870,"Q_Id":53460051,"Users Score":0,"Answer":"to continue with \"Method using only Google Colab\"\n\" %%shell jupyter nbconvert --to html \/PATH\/TO\/YOUR\/NOTEBOOKFILE.ipynb\" - as given\nthe following worked for me - type the following in Google Colab\n!pip install nbconvert\n%shell jupyter nbconvert --to html \/content\/testfile.ipynb\n(instead of using %%shell in Google Colab, use %shell - this way, it worked for me)","Q_Score":37,"Tags":"python,jupyter-notebook,google-colaboratory","A_Id":70950691,"CreationDate":"2018-11-24T16:17:00.000","Title":"Convert ipynb notebook to HTML in Google Colab","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Google Colaboratory Notebook for Data Analysis that I want to output as a HTML file as currently not everything loads within the Colab environment such as large Folium Heatmaps. Is it possible to export the notebook as a html file as opposed to the ipynb and py options?","AnswerCount":5,"Available Count":2,"Score":0.0399786803,"is_accepted":false,"ViewCount":48870,"Q_Id":53460051,"Users Score":1,"Answer":"Download your notebook and upload it back to the colab\nReplace PATH_TO_THE_NOTEBOOK_IN_COLAB in the below command to the location of the reuploaded notebook.\nUse this command to download the notebook as html => !jupyter nbconvert --to html PATH_TO_THE_NOTEBOOK_IN_COLAB.ipynb.","Q_Score":37,"Tags":"python,jupyter-notebook,google-colaboratory","A_Id":71351274,"CreationDate":"2018-11-24T16:17:00.000","Title":"Convert ipynb notebook to HTML in Google Colab","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a task queue, queue A, and a resource queue, queue B. At program start, there are a finite number of resources put in queue B. Tasks may execute if they're able to pull a resource from queue B, and once they're done executing they must put the resource back in queue B. \nUsing Celery, is there a way to pull from a different queue inside a task to accomplish this? Or does this need to be architected completely differently? \nAn alternative, albeit with potentially reduced concurrency, is pairing the task with a resource before it's put in the task queue, then polling the task for completion, and on completion freeing up that resource and putting it back in the task queue with a different task. Is this the standard solution?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":112,"Q_Id":53470909,"Users Score":0,"Answer":"The architecture I ended up deciding on accomplishes this with the help of the chain primitive in Celery, with no loss in concurrency. \nTo ensure that no two tasks are using the same resource concurrently, you can divide all tasks among the available resources before adding the tasks to the queue (so say you had 10 tasks, and 3 resources, simply assign 3 tasks to two of the resources, and 4 to the third resource). Then, for each resource, call the tasks with chain() which tells Celery to execute each of the tasks for that resource in series.","Q_Score":0,"Tags":"python,architecture,rabbitmq,celery,eventlet","A_Id":53529303,"CreationDate":"2018-11-25T19:06:00.000","Title":"How to pull from a different queue inside Celery task","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I created a web app with Flask where I'll be showing data, so I need charts for it.\nThe problem is that I don't really know how to do that, so I'm trying to find the best way to do that. I tried to use a Javascript charting library on my frontend and send the data to the chart using SocketIO, but the problem is that I need to send that data frequently and at a certain point I'll be having a lot of data, so sending each time a huge load of data through AJAX\/SocketIO would not be the best thing to do.\nTo solve this, I had this idea: could I generate the chart from my backend, instead of sending data to the frontend? I think it would be the better thing to do, since I won't have to send the data to the frontend each time and there won't be a need to generate a ton of data each time the page is loaded, since the chart will be processed on the frontend.\nSo would it be possible to generate a chart from my Flask code in Python and visualize it on my webpage? Is there a good library do that?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":139,"Q_Id":53471032,"Users Score":2,"Answer":"Try to use dash is a python library for web charts","Q_Score":1,"Tags":"python,flask,data-visualization","A_Id":53472495,"CreationDate":"2018-11-25T19:22:00.000","Title":"Adding charts to a Flask webapp","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have connected zapier to a webhook I am listening too, which sends a JSON file into my s3 bucket. \nI have some python code that I want to execute when a new file is uploaded into the bucket, in real time over the file. \nWhat is the best way to 'listen' for the upload of this file into the s3 bucket?","AnswerCount":3,"Available Count":1,"Score":0.1325487884,"is_accepted":false,"ViewCount":2916,"Q_Id":53471129,"Users Score":2,"Answer":"David here, from the Zapier Platform team. \nSeems like you've already found your answer, which is great. I just wanted to plug Zapier as an option (since you had mentioned you're already using it). Our S3 integration has a \"new file in bucket\" trigger, which you can combine with any other step (such as a Python Code step). Additionally, you could skip the middleman and structure your zap as:\n\nsome trigger\nAdd file to S3\nRun Python\n\nAnd not need to worry about webhooks at all.\n\u200bLet me know if you've got any other questions!","Q_Score":4,"Tags":"python,amazon-s3,webhooks,zapier","A_Id":53488253,"CreationDate":"2018-11-25T19:34:00.000","Title":"Best way to 'listen' to s3 bucket for new file?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to python and machine-learning but I have started to grasp it. Using AWS text_detection is really cool but I am wondering whether it can detect languages other then English. I know AWS has a feature to recognize the dominant language in text files but is there recognition for image files? Any help is appreciated.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":480,"Q_Id":53471538,"Users Score":0,"Answer":"I am pretty sure it only recognizes English words that contain only letters from the English alphabet.\nFrom the docs:\n\nA\u00a0word\u00a0is one or more ISO basic Latin script characters that aren't separated by spaces.\u00a0DetectText\u00a0can detect up to 50 words in an image.","Q_Score":0,"Tags":"python,amazon-web-services,machine-learning,ocr","A_Id":53471608,"CreationDate":"2018-11-25T20:18:00.000","Title":"Can AWS text_detection() detect Chinese or other languages in an image?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to remove the class declaration of the model but want to keep the records and the table on the database. How can I do that?","AnswerCount":2,"Available Count":1,"Score":-0.0996679946,"is_accepted":false,"ViewCount":2041,"Q_Id":53487801,"Users Score":-1,"Answer":"If the class it not going to be used anywhere but you want to keep the data:\n\nDo a dump of that data and create a new database to store the dump data.\nDelete the model.\nMake a migration deleting the model.\n\nIf you delete the model in the code I think that always you execute a manage makemigrations it will create a migration to delete the table.","Q_Score":11,"Tags":"python,django,database,django-models","A_Id":53488017,"CreationDate":"2018-11-26T19:30:00.000","Title":"How do I remove a model but keep the database table on Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I couldn't find much information on this. I want to rename my Scrapy project, spiders made, JSONs created but want to change the name to something meaningful without messing anything up.\nA solution through the terminal would also be appreciated.","AnswerCount":3,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":1607,"Q_Id":53498732,"Users Score":0,"Answer":"Basically, you only need to change default = new_project_title under [settings] in scrapy.cfg file and SPIDER_MODULES = ['new_project_title.spiders'] in the settings.py file to make the spider run with the new name of the project. \nAfter longer inspection of documentation, I have to say that the quick change of the project name through the scrapy's command line is not that easy.","Q_Score":3,"Tags":"python,python-3.x,scrapy","A_Id":59652041,"CreationDate":"2018-11-27T11:33:00.000","Title":"Rename scrapy project","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I couldn't find much information on this. I want to rename my Scrapy project, spiders made, JSONs created but want to change the name to something meaningful without messing anything up.\nA solution through the terminal would also be appreciated.","AnswerCount":3,"Available Count":3,"Score":1.2,"is_accepted":true,"ViewCount":1607,"Q_Id":53498732,"Users Score":1,"Answer":"As of right now there is no command that changes the project name from the command line. I would just rename it in your file explorer, it shouldn't mess with your spiders.","Q_Score":3,"Tags":"python,python-3.x,scrapy","A_Id":53523602,"CreationDate":"2018-11-27T11:33:00.000","Title":"Rename scrapy project","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I couldn't find much information on this. I want to rename my Scrapy project, spiders made, JSONs created but want to change the name to something meaningful without messing anything up.\nA solution through the terminal would also be appreciated.","AnswerCount":3,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":1607,"Q_Id":53498732,"Users Score":0,"Answer":"Change project directory name, search old project name in scrapy.cfg and settings.py files and replace with new project name.","Q_Score":3,"Tags":"python,python-3.x,scrapy","A_Id":57543600,"CreationDate":"2018-11-27T11:33:00.000","Title":"Rename scrapy project","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We are using django-cron version 0.5.1.\nAre these cron jobs run as separate process or are these executed as threads inside the main django process ?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":194,"Q_Id":53503274,"Users Score":1,"Answer":"Since django-cron jobs are run with a management command like so: python manage.py runcrons they will run in a separate process than your web app.","Q_Score":0,"Tags":"python,django","A_Id":53504291,"CreationDate":"2018-11-27T15:46:00.000","Title":"Are Django cron jobs processes or threads?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have model Tech, with name(Charfield) and firm(ForeignKey to model Firm), because one Tech(for example, smartphone) can have many firms(for example Samsung, apple, etc.)\nHow can I create filter in admin panel for when I creating model, If I choose 'smartphone' in tech field, it show me in firm field only smartphone firms? Coz if I have more than one value in firm field (for example Apple, Samsung, IBM), it show me all of it. But IBM must show only if in tech field I choose 'computer'. How release it?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1115,"Q_Id":53504338,"Users Score":1,"Answer":"You can define the choices of the input with the attribute 'choices' of the widget. When you create the admin form of the model, you could define manually the fields, and also you can define the widget for each input. In the widget you could define with a tuple the choices and the initial values.","Q_Score":1,"Tags":"django,python-3.x,filter,django-admin","A_Id":53506417,"CreationDate":"2018-11-27T16:44:00.000","Title":"How to filter choices in fields(forms) in Django admin?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have very little to say about this issue so hopefully this is a known problem and I'm just bad at finding previous threads about it. In any case, as the title states, I'm trying to convert PDF files to sets of images in bulk (for right now I'd like it to work for just one conversion though).\nI'm trying to use a wrapper for poppler (pdf2image), but when I attempt to run the conversion, I get the following error:\n\nException: Unable to get page count. Is poppler installed and in PATH?\n\nI installed poppler and added it to PATH, but I still get the error. What gives? And additionally, is there a more succinct\/better way to do this conversion?","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":4660,"Q_Id":53525731,"Users Score":1,"Answer":"try to add poppler\/bin in system variable path","Q_Score":0,"Tags":"python,pdf,poppler","A_Id":54084276,"CreationDate":"2018-11-28T18:19:00.000","Title":"Converting PDFs to images in Python with Poppler, but Poppler doesn't register as being in PATH?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have very little to say about this issue so hopefully this is a known problem and I'm just bad at finding previous threads about it. In any case, as the title states, I'm trying to convert PDF files to sets of images in bulk (for right now I'd like it to work for just one conversion though).\nI'm trying to use a wrapper for poppler (pdf2image), but when I attempt to run the conversion, I get the following error:\n\nException: Unable to get page count. Is poppler installed and in PATH?\n\nI installed poppler and added it to PATH, but I still get the error. What gives? And additionally, is there a more succinct\/better way to do this conversion?","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":4660,"Q_Id":53525731,"Users Score":1,"Answer":"You can explicitly add the path in convert_from_path function of module pdf2image \nExample==>\npages = pdf2image.convert_from_path(pdf_file, poppler_path='your_path')\nworks just fine and you don't worry about adding it to system path variables.","Q_Score":0,"Tags":"python,pdf,poppler","A_Id":56473683,"CreationDate":"2018-11-28T18:19:00.000","Title":"Converting PDFs to images in Python with Poppler, but Poppler doesn't register as being in PATH?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Edit Form is not editable on production and the image button in the left, while on development it is editable and image button on the right.\nWhat could be the issue?\nThe code is exactly the same. Checked on Chrome, IE and Firefox - same issue\nCleaned cache - didn't help.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":250,"Q_Id":53537037,"Users Score":1,"Answer":"For me, when I applied the collectstatic command on production, instead of overwriting the previous css file I had it instead appended the additional code from the new css file.\nYou can use the browser development tool's 'Network' tab to see each file being loaded (css and javascript) and double click them to see if the content of those files matches the content you are expecting to see!","Q_Score":2,"Tags":"python,html,django","A_Id":64091171,"CreationDate":"2018-11-29T10:36:00.000","Title":"Django CSS is displayed different on local and production environment","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In my index, I don't have a timestamp field. I need to fetch only new records added every day, instead of fetching all records every time. Is there any way to do this even though I don't have any timestamp field","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":163,"Q_Id":53538534,"Users Score":0,"Answer":"Elasticsearch doesnot store such fields.\nYou can use ingest feature or obviously add a timestamp field.","Q_Score":0,"Tags":"python,elasticsearch,elasticsearch-py","A_Id":53540476,"CreationDate":"2018-11-29T11:57:00.000","Title":"How to get last modified record from Elasticsearch, when there is no timestamp field?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"This maybe stupid. But I'm finding problem in it.\nI'm working with Django, I have read docs.\nBut for the forms, there is class. If I use this then a form is generated in the view,\nBut actually I hardcoded the entire form, I just need to take the values from it.\nLike PHP.\nHow to achieve this, I don't wanna Django to generate my form.\nThanks in advance!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":175,"Q_Id":53542569,"Users Score":0,"Answer":"You can access it with something along this line: request.GET['field_name']","Q_Score":0,"Tags":"python,html,django,forms","A_Id":53542887,"CreationDate":"2018-11-29T15:37:00.000","Title":"How to get values from Raw Html for in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to pass instance id after last \/ of my @action name method, and I seriously have no idea how...\nI have a UserViewSet, which url to access list is : \/users\/, then i have action called favorite_posts, which is detail=False because I'm filtering by current logged user, and the action refer to user posts, I wanna be able to pass the post_id like \/users\/favorite_posts\/post_id\/, because in this case it's more friendly to me than \/users\/1\/favorite_posts\/ which I could obtain setting detail=True.\nIs there any way to do that?","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":8755,"Q_Id":53544318,"Users Score":0,"Answer":"This only works with r because its regex use url_path=r'favorite_posts\/(?P<user_id>\\d+)', url_name='favorite-posts'","Q_Score":4,"Tags":"python,django,django-rest-framework","A_Id":65922314,"CreationDate":"2018-11-29T17:14:00.000","Title":"Django Rest Framework url_pattern of @action","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I work on web application that generates pdf, it returns generated pdf file. Previously I handled the pdf generation in the main process. My superior told me, that will potentially cause the app to stall, as django is synchronous.\nSo he suggest offload the process to celery, I tried it and have the idea about how to process it using celery. But I can't figure out the how to return the response to the client.\nI can return response that it's being processed, but what about the pdf file? return the possible url too? and send request every now and then?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":56,"Q_Id":53550436,"Users Score":1,"Answer":"Typically this is handled by making the HTTP interaction asynchronous as well.\nInstead of returning the PDF, you'd return a future link that the PDF will be available on or a processing status page, and the client can poll on that link to retrieve the PDF. Typically, this is done by returning HTTP 202 Accepted response.\nOther alternative that may be suitable in different circumstances is to return the response in a WebSocket push message. This may be suitable if your already have a WebSocket connection in the app or if you need lower latency than can be provided by polling. If the processing takes very long time (e.g hours), it may be appropriate to ask the user their email address (or take the email address from the user's profile) and send the user an email when they can retrieve the result.","Q_Score":1,"Tags":"python,django,celery","A_Id":53550560,"CreationDate":"2018-11-30T02:37:00.000","Title":"How can one return offloaded process response from celery?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am trying to obtain an application variable (app user id) in before_execute(conn, clauseelement, multiparam, param) method. The app user id is stored in python http request object which I do not have any access to in the db event.\nIs there any way to associate a piece of sqlalchemy external data somewhere to fetch it in before_execute event later? \nAppreciate your time and help.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":98,"Q_Id":53551209,"Users Score":0,"Answer":"Answering my own question here with a possible solution :)\n\nFrom http request copied the piece of data to session object\nSince the session binding was at engine level, copied the data from session to connection object in SessionEvent.after_begin(session, transaction, connection). [Had it been Connection level binding, we could have directly set the objects from session object to connection object.]\n\nNow the data is available in connection object and in before_execute() too.","Q_Score":0,"Tags":"python,sqlalchemy","A_Id":53667953,"CreationDate":"2018-11-30T04:23:00.000","Title":"Sqlalchemy before_execute event - how to pass some external variable, say app user id?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm trying to figure out what the \"last-modified\" field indicates on user pages. It has only updated when I changed my profile information, but I'd like to know if there is a way to figure out when a user was last active?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":444,"Q_Id":53551468,"Users Score":0,"Answer":"That level of user information is not available via the API, likely for privacy reasons. There is an online boolean field available for the \/users endpoint, which appears to show the user's online status.","Q_Score":0,"Tags":"python,python-3.x,api,soundcloud","A_Id":53553647,"CreationDate":"2018-11-30T04:55:00.000","Title":"How to find when soundcloud user was last active using API","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to load certain data using sessions (locally) and it has been working for some time but, now I get the following warning and my data that was loaded through sessions is no longer being loaded.\n\nThe \"b'session'\" cookie is too large: the value was 13083 bytes but\n  the header required 44 extra bytes. The final size was 13127 bytes but\n  the limitis 4093 bytes. Browsers may silently ignore cookies larger\n  than this.\n\nI have tried using session.clear(). I also opened up chrome developer tools and tried deleting the cookies associated with 127.0.0.1:5000. I have also tried using a different secret key to use with the session.\nIt would be greatly appreciated if I could get some help on this, since I have been searching for a solution for many hours.\nEdit:\nI am not looking to increase my limit by switching to server-side sessions. Instead, I would like to know how I could clear my client-side session data so I can reuse it.\nEdit #2:\nI figured it out. I forgot that I pushed way more data to my database, so every time a query was performed, the session would fill up immediately.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":6403,"Q_Id":53551637,"Users Score":6,"Answer":"It looks like you are using the client-side type of session that is set by default with Flask which has a limited capacity of 4KB. You can use a server-side type session that will not have this limit, for example, by using a back-end file system (you save the session data in a file system in the server, not in the browser). To do so, set the configuration variable 'SESSION_TYPE' to 'filesystem'. \nYou can check other alternatives for the 'SESSION_TYPE' variable in the Flask documentation.","Q_Score":6,"Tags":"python,session,flask","A_Id":53554226,"CreationDate":"2018-11-30T05:17:00.000","Title":"Session cookie is too large flask application","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Lambda function to send messages from a SQS deadletter to another SQS, but now I want to customize it, where I can specificate the range of the dates, type, another among, maybe from AWS CLI where I can specificate the configuration test event. Exist a way to do this? Thanks in advance.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":628,"Q_Id":53559308,"Users Score":0,"Answer":"You can do this using lambda function which will first read SQS messages from queue1 and you can use that and  customize (add your logic of addition of strings\/dates) and then write to SQS queue 2 from your lambda function.","Q_Score":0,"Tags":"python-2.7,aws-lambda,amazon-sqs,dead-letter","A_Id":53563570,"CreationDate":"2018-11-30T14:20:00.000","Title":"How to filter messages that I want to send to SQS - AWS Lambda","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Since Postgres supports JSON fields, is that more preferential than say saving each config item in a row in some table the way WP still does?\nFull disclosure: I'm asking as a Django user new to postgres.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":115,"Q_Id":53566994,"Users Score":2,"Answer":"It depends. Here are some things to think about:\n\nDoes the data structure map well to JSON? Try to visualize it. Is the data more relational (think of links to other data), or a hierarchy? If the data you are  storing needs to mix a lot with relationally stored data, it could become a pain.\nDo you do complicated searches on these fields? There is powerful functionality for querying jsonb fields, but there will likely be complications and learning involved. I like the power of querying jsonb and manipulating it in my queries, but it's never as easy or natural to me as regular SQL.\nWill your ORM and any other tools like query builders play well with it? It's an especially important question if you are using older technology. If you use an ORM, it may become annoying to have to work with plain SQL just to do jsonb queries.\nLazy loading is another consideration. If you have a lazy load strategy, it may or may not translate well into jsonb fields. If your lazy loading strategy is complex, it may require some work to get it to work well with jsonb fields.\nA good strategy for serialization and deserialization will be necessary. If you don't have a good implementation of that, it will get clumsy.\n\nBy the way...I am a big advocate for using jsonb. In my opinion, it has been a good game changer. So don't think that I am discouraging it. That said, if you just try to make everything jsonb, you will probably soon regret it. You just need to sort of evaluate what works best for each case. In general, I think it does work well for config, usually, though I'd have to know about the particular case.I hope this helps a bit!","Q_Score":0,"Tags":"python,django,postgresql","A_Id":53567055,"CreationDate":"2018-12-01T01:27:00.000","Title":"Saving data in rows in a Config table vs. saving as keys in a Postgres JSONField--which is better?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working on my first real django project, and was fiddling around with the css, but the changes I made did not have any effect on the site. I tried changing things on all 3 of the css files but nothing changed. I then deleted the files (from the project I still have them), and still nothing changed. My site is getting styled, I checked all of my html to make sure there was no inline style in there. All the html files are working, when I change them the site changes. Is this some weird caching thing? I've tried rerunning the server several times and still my site is getting style, seemingly from nowhere. Anyone have any ideas?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":41,"Q_Id":53583363,"Users Score":0,"Answer":"Try opening your site from now on in incognito mode. I think it is some weird caching thing so maybe clear your cache too. When developing I just use igcognito and static updates just fine.","Q_Score":0,"Tags":"python,django,django-templates","A_Id":53583671,"CreationDate":"2018-12-02T18:35:00.000","Title":"Phantom style in django project","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So instead of having data-item-url=\"https:\/\/miglopes.pythonanywhere.com\/ra%C3%A7%C3%A3o-de-c%C3%A3o-purina-junior-10kg\/\"\nit keeps on appearing \ndata-item-url=\"http:\/\/localhost\/ra%C3%A7%C3%A3o-de-c%C3%A3o-purina-junior-10kg\/\"\nhow do i remove the localhost so my snipcart can work on checkout?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":88,"Q_Id":53587049,"Users Score":0,"Answer":"Without more details of where this tag is coming from it's hard to know for sure... but most likely you need to update your site's hostname in the Wagtail admin, under Settings -> Sites.","Q_Score":0,"Tags":"localhost,wagtail,pythonanywhere,snipcart","A_Id":53600830,"CreationDate":"2018-12-03T03:23:00.000","Title":"data-item-url is on localhost instead of pythonanywhere (wagtail + snipcart project)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"i'm trying to make a user registration with multiple fields to save in the same model. The idea is have a form in the home page with username and password and when press button continue the user is redirected to another page with multiple fields to  insert personal info for the user profile.\nI imagine i must have two different views for that, but i don't understand how put all this data together.\nThanks!","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":117,"Q_Id":53591926,"Users Score":0,"Answer":"In your case i would prefer manipulate HTML content with JavaScript and after everything is ready, just send an ajax call.","Q_Score":1,"Tags":"python,django,django-models,django-forms","A_Id":53594798,"CreationDate":"2018-12-03T10:34:00.000","Title":"How to save data to the same model from forms in different pages...Registration multiple fields? Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a table where i am checking if any row exists, if yes then update some fields of that table and if no, then particular row is inserted with all the values of the specified fields using django models..\nSo basically what i have done is..\nFirst i check if the values doesn't exist, then i add those values using create method.. After that i read the table again and then check whether to update particular field or not after all this i send a jsonresponse..\nSo when i request first time it adds all the rows required along with the existing one and gives an value error saying httpresponse error returned none and again if i request same url i get the values with updated fields too based on the inserted rows as well! \nSo is their a way to make it work as if the row doesn't exist then insert or else update specific field?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":375,"Q_Id":53602559,"Users Score":0,"Answer":"Make a two step process in your logic,\n 1. Check if record exist :\n         Yes : update \n         No. : create  new record","Q_Score":0,"Tags":"python,django-models","A_Id":53612195,"CreationDate":"2018-12-03T21:58:00.000","Title":"Existing row update or else insert a new row using django models","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am creating Login, Signup, and a few other forms which require the user to click on a submit button. What is the difference between using a SubmitField in my form class vs using html <input type=\"submit\" value=\"Log in\"> ? Which should I prefer and when?\nI initially created with html because I was unaware of the SubmitField option in wtforms.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":337,"Q_Id":53645514,"Users Score":1,"Answer":"WTForms SubmitField will create required HTML code ( field value, name, label etc.. ) ( you can apply styles also ). In your HTML, you've to write all these.\nYou can use any of these. It all comes to how you're getting data from form and processing it in the backend.","Q_Score":0,"Tags":"python,html,flask,flask-wtforms","A_Id":53645861,"CreationDate":"2018-12-06T06:04:00.000","Title":"What are the advantages\/disadvantages of using a SubmitField from flask wtforms vs a html submit button?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Scrapy crawler and I want to rotate the IP so my application will not be blocked. I am setting IP in scrapy using request.meta['proxy'] = 'http:\/\/51.161.82.60:80' but this is a VM's IP. My question is can VM or Machine's IP be used for scrapy or I need a proxy server?\nCurrently I am doing this. This does not throw any error but when I get response from http:\/\/checkip.dyndns.org it is my own IP not updated IP which I set in meta. That is why I want to know if I do need proxy server.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":64,"Q_Id":53645854,"Users Score":0,"Answer":"Definitely you need a proxy server. meta data is only a field in the http request. the server side still knows the public ip that really connecting from the tcp connection layer.","Q_Score":0,"Tags":"python,scrapy,web-crawler","A_Id":53647528,"CreationDate":"2018-12-06T06:38:00.000","Title":"Can VM \/ Machine IP be used instead of Proxy Server for Scrapy","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We have a web application runs on python tornado framework(MVC structure).\nApplication contains many filters for sorting,searching etc. \nWhenever you apply\/select any filter inside the application we are using AJAX calls to send it to back-end(controller). Since we have many AJAX calls and controllers, filters needs to passed every time and each AJAX calls. Obviously there should be a better way to do it.\nI checked about secured cookies which supported by tornado server and many people suggested \"cookies\" is the best way.\nPlease suggest me if there is any other way.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":24,"Q_Id":53646820,"Users Score":0,"Answer":"For a REST API it's a right way to pass the whole request context at each request \u2014 all filters. I really doubt that your filters are so huge, that overhead of transporting them is so significant that it's worth of any optimization which will lead to complication of your app for almost no benefits.","Q_Score":0,"Tags":"javascript,ajax,python-2.7,tornado","A_Id":53915481,"CreationDate":"2018-12-06T07:50:00.000","Title":"Maintaining filter values of a web application","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Here is the scenario. I have Django project and python script project under a directory. The python script needs to runs independently on a scheduled time and also needs to access Database used by Django.\nIs it possible to use\/import existing Django code in python script to access db. If so how?\nThe idea comes for C# app where Models and data access layer can be built as library and can be used in many projects.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1288,"Q_Id":53657609,"Users Score":0,"Answer":"Faced the same problem and finally decided to implement a daemon in django custom command.\nYou can import anything django related there just as you would normally do in django code, while implementing your own code.","Q_Score":2,"Tags":"python,django,django-models","A_Id":59825264,"CreationDate":"2018-12-06T18:29:00.000","Title":"Using django ORM from non django python script","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I keep getting this traceback. I've used BeautifulSoup before with Python3 so I'm kind of confused as to why I would get this error now...\n'''Traceback (most recent call last):\n  File \"spider.py\", line 7, in \n    from bs4 import BeautifulSoup\n  File \"\/home\/cambam\/Desktop\/Python\/Coursera\/P4E\/CapStone\/pagerank\/bs4\/init.py\", line 54\n    'You are trying to run the Python 2 version of Beautiful Soup under Python 3. This will not work.'<>'You need to convert the code, either by installing it (python setup.py install) or by running 2to3 (2to3 -w bs4).'\n                                                                                                       ^\nSyntaxError: invalid syntax\n'''","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1566,"Q_Id":53684458,"Users Score":0,"Answer":"OK I already figured out the answer.\nFirst I ran 'sudo apt install 2to3' in the command line \nThen 2to3 -w bs4\nI ran the program again and now it works.","Q_Score":0,"Tags":"python-3.x,python-2.7,beautifulsoup,traceback","A_Id":53684508,"CreationDate":"2018-12-08T16:18:00.000","Title":"BeautifulSoup Python3 version","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I install Beautiful Soup in Anaconda Python 3.6.4 Windows 10:\n\nI downloaded and unpacked beautifulsoup4-4.6.3.tar.gz on my Desktop\nI created an environment variable Pythonbasepath including the following directories:\n\nC:\\Users\\Mika and Friends\\Anaconda3\nC:\\Users\\Mika and Friends\\Anaconda3\\Lib\nC:\\Users\\Mika and Friends\\Anaconda3\\include\nC:\\Users\\Mika and Friends\\Anaconda3\\DLLs\nC:\\Users\\Mika and Friends\\Anaconda3\\Scripts\nC:\\Users\\Mika and Friends\\Anaconda3\\Lib\\site-packages\n\nFrom the directory where I have extracted Beautiful Soup I try to run a command and I get an error: \n\n\nC:\\Users\\Mika and Friends\\Desktop\\bs4\\bs4>python setup.py install\n  'python' is not recognized as an internal or external command,\n  operable program or batch file.\n\nIt seems something is wrong with the environment variable setup, but I cannot figure out what.","AnswerCount":3,"Available Count":2,"Score":1.0,"is_accepted":false,"ViewCount":12835,"Q_Id":53694696,"Users Score":6,"Answer":"Run the following command from Command Prompt: \nconda install -c anaconda beautifulsoup4\nThis is the easiest way to install a python library in Anaconda.","Q_Score":2,"Tags":"python","A_Id":53723165,"CreationDate":"2018-12-09T17:11:00.000","Title":"Cannot install Beautiful Soup in Anaconda Python 3.6.4 Windows 10","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I install Beautiful Soup in Anaconda Python 3.6.4 Windows 10:\n\nI downloaded and unpacked beautifulsoup4-4.6.3.tar.gz on my Desktop\nI created an environment variable Pythonbasepath including the following directories:\n\nC:\\Users\\Mika and Friends\\Anaconda3\nC:\\Users\\Mika and Friends\\Anaconda3\\Lib\nC:\\Users\\Mika and Friends\\Anaconda3\\include\nC:\\Users\\Mika and Friends\\Anaconda3\\DLLs\nC:\\Users\\Mika and Friends\\Anaconda3\\Scripts\nC:\\Users\\Mika and Friends\\Anaconda3\\Lib\\site-packages\n\nFrom the directory where I have extracted Beautiful Soup I try to run a command and I get an error: \n\n\nC:\\Users\\Mika and Friends\\Desktop\\bs4\\bs4>python setup.py install\n  'python' is not recognized as an internal or external command,\n  operable program or batch file.\n\nIt seems something is wrong with the environment variable setup, but I cannot figure out what.","AnswerCount":3,"Available Count":2,"Score":-0.0665680765,"is_accepted":false,"ViewCount":12835,"Q_Id":53694696,"Users Score":-1,"Answer":"One method that happened to work, and I am not sure how valid (safe) it is for other users:\nI use Miniconda (smaller Anaconda packages) and installed bs4 through pip install bs4 instead of conda install bs4 (because it doesn't exist) in terminal whilst using my personal conda env to run a python program using BeautifulSoup. May save some trouble for others, but could be due to other settings on my device. \nI was using conda 4.8.3, Python 3.7.6, Windows 10 when this worked for me.","Q_Score":2,"Tags":"python","A_Id":60921099,"CreationDate":"2018-12-09T17:11:00.000","Title":"Cannot install Beautiful Soup in Anaconda Python 3.6.4 Windows 10","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have few python and fortran code developed for conducting scientific simulations for a research problem. 90% of the code can only be executed as a serial process as the solution procedure is implicit. Often, while running the code in my laptop, I have noticed that it occupies 1 full core of the CPU at 90-100% all the time during simulation and each simulation lasts for 10+ hours.\nBut now as I need to run the same code multiple times, it has becomes too slow to do it in my laptop and it limit smooth functioning for other activities during the period of the simulation. My code generally requires low memory (<1 GB) but high computational power.  It requires no data transfer while running the simulation. Below are the two answers I seek:\n\nWhich ec2 instance type in Amazon Web Service (AWS) would be the best fit? \nIs it advisable to run, say 7 separate codes within an 8 vCPU machine or 7 codes in separate 2 vCPU multiple machines. I find the pricing for the latter in AWS to be economical. Also since high CPU rate is a requirement for my code, I have noticed that lower cores seems to offer more CPU speed.\n\nI would appreciate anyguidance in this matter.\nThanks!","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":288,"Q_Id":53695443,"Users Score":1,"Answer":"this answer might be a bit late for you (2 and half years on), but in case you're still interested!\nThe best fit for the machine depends on what you need for the work you are doing. It can be a tradeoff between cost and speed. For example, if you run an 8-core machine with 8 concurrent processes, it will be done 8 times faster than the same speed cpu core. You could also run your process across multiple virtual machines.\nWith today's AWS instances, you can scale all the way up to 36 cores on a single machine. But in your AWS account, you could run hundreds of cores concurrently. So developing a way to run the code across machines will help you as you need to scale out.\nAt my company, we run hundreds of fortran programs concurrently across 40 computers in AWS and have been using spot instances instead of on-demand instances to lower costs.","Q_Score":1,"Tags":"python,amazon-web-services,amazon-ec2,fortran,scientific-computing","A_Id":68184895,"CreationDate":"2018-12-09T18:35:00.000","Title":"Running multiple Python\/FORTRAN codes for scientific computations with Amazon EC2","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a regular website where HTML5, CSS3, JQUERY and static images have been used.\nI also have a Blog written in Django and I would like to integrate it in the website. \nI am really new to Django so I was wondering which is the best approach to use.\nShould I integrate the website code as part of the Django project or there are some other solutions? \nthanks!","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":168,"Q_Id":53703623,"Users Score":0,"Answer":"You have 2 ways of integrating your current site with Django.\n1) You can write API with DjangoRestFramework and make requests with jQuery AJAX in order to get content from Django. \n2) You can use your current HTML files as your Django project templates for rendering content from Django.","Q_Score":1,"Tags":"python,django,html","A_Id":53703710,"CreationDate":"2018-12-10T10:21:00.000","Title":"Integrate Django blog project in HTML website","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"The website is running using node server. I want to create a python flask rest api to connect to pop up chat window of this website.My python flask is running in 8085 port and node server is running in 8082 port.\nin python flask app.py \n\n@app.route('\/') \n  def hello_world():\n      return render_template('popupchat.html') \n@app.route('\/chat',methods=[\"POST\"]) def chat():\n\nthis popupchat.html is pointing to website pupupchat window. and there is one bind.js script having  $.post(\"\/chat\" , if i want to connect this pop up chat window running in node server to python flask server , how i will connect .\ni appreciate your suggestions","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":949,"Q_Id":53711272,"Users Score":0,"Answer":"If you are just debugging try to adjust the port on the side of the chat window. You can tell the chat window to reach a certain port by altering the url you are trying to reach. Example:\nhttp:\/\/your_ip:your_port\/your_route or in your case http:\/\/your_ip:8085\/your_route\nIf you are already deployed please talk to your admin since this might be depending on your server.","Q_Score":1,"Tags":"javascript,python,html,flask-restful","A_Id":53712290,"CreationDate":"2018-12-10T18:07:00.000","Title":"python flask running in one port connected to UI running in node server different port","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So I'm running python 3.7 on Windows and I have installed python-dotenv in my virtual environment as well as flask.  I have a .flaskenv file in the root of my project where I execute flask run, it looks as if python\/flask is not recognizing python-dotenv .flaskenv file it ignores my parameters and states that I do not have a FLASK_APP value assigned.  This same setup works fine on a Linux workstation.  Is there something different to configure on windows to get this to work?\nThanks ahead of time.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":717,"Q_Id":53725865,"Users Score":0,"Answer":".flaskenv seems to be working fine on Windows 10. Have you tried creating a new file named .flaskenv, without specifying any extension, in Visual Studio Code? A .flaskenv file of FLASKENV FILE type gets automatically created. I have in there a single line FLASK_APP=yourFileName.py.\nHope this helps.","Q_Score":2,"Tags":"python,flask","A_Id":56429408,"CreationDate":"2018-12-11T14:08:00.000","Title":"Flask run not recognizing python-dotenv on windows","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"So I'm running python 3.7 on Windows and I have installed python-dotenv in my virtual environment as well as flask.  I have a .flaskenv file in the root of my project where I execute flask run, it looks as if python\/flask is not recognizing python-dotenv .flaskenv file it ignores my parameters and states that I do not have a FLASK_APP value assigned.  This same setup works fine on a Linux workstation.  Is there something different to configure on windows to get this to work?\nThanks ahead of time.","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":717,"Q_Id":53725865,"Users Score":1,"Answer":"I ran into the same issue and resolved it by executing python -m flask run instead of flask run. The -m allows modules to be located and executed.","Q_Score":2,"Tags":"python,flask","A_Id":59671502,"CreationDate":"2018-12-11T14:08:00.000","Title":"Flask run not recognizing python-dotenv on windows","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"In my view.py I obtain a date from my MSSQL database in this format 2018-12-06 00:00:00.000 so I pass that value as context like datedb and in my html page I render it like this {{datedb|date:\"c\"}} but it shows the date with one day less like this:\n\n2018-12-05T18:00:00-06:00\n\nIs the 06 not the 05 day.\nwhy is this happening? how can I show the right date?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":19,"Q_Id":53731263,"Users Score":0,"Answer":"One way of solve the problem was chage to USE_TZ = False has Willem said in the comments, but that gives another error so I found the way to do it just adding in the template this {% load tz %} and using the flter |utc on the date variables like datedb|utc|date:'Y-m-d'.","Q_Score":0,"Tags":"python,django,django-templates,django-template-filters","A_Id":53749903,"CreationDate":"2018-12-11T19:43:00.000","Title":"Template rest one day from the date","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created some models and when I run python manage.py db migrate command it creates migrations file, so that is fine.\npython manage.py db upgrade command also creates table in Database.\nIf I again run the python manage.py db migrate command then it is creating migrations file for those models that I have upgraded recently.\nCan you please help me to resolve it.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":221,"Q_Id":53737789,"Users Score":0,"Answer":"I think the problem is to manage.py. If you did it as described on flask-migration site and stored all your models in this file - flask-migration just get these models and generates migrations and will do it always. You wrapped the standard command in your file and this is the problem.\nIf you want to fix it - store models in another directory (or another file), add them to an app and use command flask db migrate. In this case, flask-migration will generate migration for models only at first time, for others, it will detect changes and generate migrations only for changes.\nBut be careful, flask-migration don't see all changes. From site:\n\nThe migration script needs to be reviewed and edited, as Alembic currently does not detect every change you make to your models. In particular, Alembic is currently unable to detect table name changes, column name changes, or anonymously named constraints. A detailed summary of limitations can be found in the Alembic autogenerate documentation.","Q_Score":1,"Tags":"python,flask,flask-sqlalchemy,flask-migrate","A_Id":53746095,"CreationDate":"2018-12-12T07:12:00.000","Title":"migrations are getting created repeatedly","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on a django application which uses celery for the distributed async processes. Now I have been tasked with integrating a process which was originally written with concurrent.futures in the code. So my question is, can this job with the concurrent futures processing work inside the celery task queue. Would it cause any problems ? If so what would be the best way to go forward. The concurrent process which was written earlier is resource intensive as it is able to avoid the GIL. Also, its very fast due to it. Not only that the process uses concurrent.futures.ProcessPoolExecutor and inside it another few (<5) concurrent.futures.ThreadPoolExecutor jobs.\nSo now the real question is should we extract all the core functions of the process and re-write them by breaking them as celery app tasks or just keep the original code and run it as one big piece of code within the celery queue.\nAs per the design of the system, a user of the system can submit several such celery tasks which would contain the concurrent futures code.\nAny help will be appreciated.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":611,"Q_Id":53738183,"Users Score":0,"Answer":"Your library should work without modification. There's no harm in having threaded code running within Celery, unless you are mixing in gevent with non-gevent compatible code for example.\nReasons to break the code up would be for resource management (reduce memory\/CPU overhead). With threading, the thing you want to monitor is CPU load. Once your concurrency causes enough load (e.g. threads doing CPU intensive work), the OS will start swapping between threads, and your processing gets slower, not faster.","Q_Score":1,"Tags":"python,django,celery,concurrent.futures","A_Id":53891099,"CreationDate":"2018-12-12T07:39:00.000","Title":"Running a python program which uses concurrent.futures within a celery based web app","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"I've produced a few Bokeh output files as the result of a fairly time intensive process. It would be really cool to pull the plots together from their respective files and build a new output file where i could visualize them all in a column. I know I should have thought to do this earlier on before producing all the individual plots, but, alas, i did not. \nIs there a way to import the preexisting figures so that I can aggregate them together into new multi-multi plot output file?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":90,"Q_Id":53746686,"Users Score":1,"Answer":"As of Bokeh 1.0.2, there is not any existing API for this, and I don't think there is any simple technique that could accomplish this either. I think the only options are: some kind of (probably somewhat fragile) text scraping of the HTML files, or distributing all the HTML files and using something like <iframe> to collect the individual subplot files into one larger view. \nGoing forward, for reference there is autoload_static that allows plots to be encapsulated in \"sidecar\" JS files that can be individually distributed and embedded, or there is json_item that produces and isolated JSON representation of the document that can also be individually distributed and embedded.","Q_Score":1,"Tags":"python-3.x,plot,import,bokeh","A_Id":53747543,"CreationDate":"2018-12-12T15:51:00.000","Title":"Is it possible to import bokeh figures from the html file they have been saved in?","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am creating a REST API in python and currently, there is a route to a list of the resource instructors:\nGET \/instructors\nBut, I also have another client, used as a CRM for users who have an admin-role.\nFor the client, I want to display a list of instructors but with more fields and different properties.\nMy first thought is also to have the route:\nGET \/instructors \nThis obviously conflicts with the route above. \nWhat is the best name for this route?\nGET \/instructors\/admin\nor\nGET \/admin\/instructors\nor \nGET \/instructors?admin=True\nI am not sure how to approach this.\nThanks in advance.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":938,"Q_Id":53787342,"Users Score":0,"Answer":"I am glad that we are finally talking about the naming conventions this totally depends on personal preference and use cases and how your project has been designed so i will keep here my views ..\nLike you said all of the above seem to be good but how i would do is\n\nGET\/Instructors\/all \nGET\/Instructors\/admin \nGET\/Instructors\/any other special role\n\nyou may use queries when something specific has to be done with these roles again as in \nGET\/Instructors\/all?credibility=PHD \nsomething like the above its never a good idea to show every thing on just parent calls like GET\/Instructor as you said firstly it creates confusion and makes the readability of your endpoints difficult with time when the complexity of your application increases.","Q_Score":0,"Tags":"python,rest,api","A_Id":53787444,"CreationDate":"2018-12-14T21:50:00.000","Title":"Rest api naming conventions for consumer and admin","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"As the title says, I have an app hosted on Heroku that seems to have more than one instance running.  This is a problem because I am trying to keep track of single letter posts on a GroupMe in order to see if they spell anything.  I am using python and a global string variable that I can add the characters to.  Since there is more than one instance, there is more than 1 global variable so sometimes the character gets added to one or the other which defeats the purpose of the program.  Has anyone else run into this problem or found a fix to this?  Thanks.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":106,"Q_Id":53799174,"Users Score":1,"Answer":"So after thinking about possible ways to fix it, I decided to try to keep my global variables inside a json file and then edit that each time.  This worked as I believe that even if there were 2 version of the actual code running, they should both edit the same json file.","Q_Score":2,"Tags":"python,heroku,groupme","A_Id":53806183,"CreationDate":"2018-12-16T03:22:00.000","Title":"My Heroku app seems to be running more than 1 instance","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to create a system that has two type of user.\nNormal users and coaches.\nHow can I separate users when they login in system.\nI want to separate their dashboard after they logged in.\nShould I create two model? one model for users and one model for coaches?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":551,"Q_Id":53811891,"Users Score":0,"Answer":"You can either use Django's built-in Groups feature, create a Coach group and check in your views if a user is part of that group. Or you extend AbstractUser by adding a boolean field is_coach (and set AUTH_USER_MODEL settings to your new User model). \nThen you can check this flag in your views. \nThe more interesting question is if you want to store extra information (add extra functionality on the user level) for coach type users. If this is the case, you can make a so called Profile model Coach which you set in one-to-one relation with the User model (which should only serve authentication purposes). Then you can add extra fields in your profile model to store information relevant to coaches. The next question would be: what about students? Should students be able to enroll in courses?","Q_Score":0,"Tags":"python,django","A_Id":53814173,"CreationDate":"2018-12-17T09:05:00.000","Title":"How to separate users dashboard and model in django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How to export and ensure availability of variables from .env file on server start\/restart in Python?\nI have file .env with secured variables, such as passwords, credentials and confidential information. I want to make this variables available on the server start\/restart.\n\nHow to load variables from .env in Python?\nHow to load\/reload variables from .env in Python, when server is restarted, reloaded?\nHow to ensure that variables is always in operational memory?\nIs there any other better way to do solve the same technical issue?\n\nI am using Flask and run app on Apache2 using WSGI.\nMy file looks the following:\n\nENVIRONMENT_VARIABLE_EXAMPLE=SECRET_KEY","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":27,"Q_Id":53823181,"Users Score":0,"Answer":"I had to put content of the file into envvars into Apache2 server. \nAfter I did this, I get everything working. I thought there is a Python way to export environment variables in Flask application while running on Apache2 but nothing worked for me.\nAnother solution I see but has never tried myself to add into Apache2 config SetEnv VAR_KEY VAR_VALUE alike statements.","Q_Score":0,"Tags":"python,python-3.x,flask,environment-variables,apache2","A_Id":54126626,"CreationDate":"2018-12-17T21:23:00.000","Title":"How to export and ensure availability of variables from .env file on server start\/restart in Python, Flask?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've a machine learning application which uses flask to expose api(for production this is not a good idea, but even if I'll use django in future the idea of the question shouldn't change).\nThe main problem is how to serve multiple requests to my app. Few months back celery has been added to get around this problem. The number of workers in celery that was spawned is equal to the number of cores present in the machine. For very few users this was looking fine and was in production for some time.\nWhen the number of concurrent users got increased, it was evident that we should do a performance testing on it. It turns out: it is able to handle 20 users for 30 GB and 8 core machine without authentication and without any front-end. Which is not looking like a good number.\nI didn't know there are things like: application server, web server, model server. When googling for this problem: gunicorn was a good application server python application.\n\nShould I use gunicorn or any other application server along with celery and why\nIf I remove celery and only use gunicorn with the application can I achieve concurrency. I have read somewhere celery is not good for machine learning applications.\nWhat are the purposes of gunicorn and celery. How can we achieve the best out of both.\n\nNote: Main goal is to maximize concurrency. While serving in production authentication will be added. One front-end application might come into action in between in production.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2205,"Q_Id":53845434,"Users Score":9,"Answer":"There is no shame in flask. If in fact you just need a web API wrapper, flask is probably a much better choice than django (simply because django is huge and you'd be using only a fraction of its capability).\nHowever, your concurrency problems are apparently stemming from the fact that you are doing some heavy-duty processing for each request. There is simply no way around that; if you require a certain amount of computational resources per request, you can't magic those up. From here on, it's a juggling act.\n\nIf you want a guaranteed response immediately, you need to have as many workers as potential simultaneous requests. This may involve load balancing over multiple servers, if you can't scrounge up enough resources on one server. (cue gunicorn, a web application server, responsible for accepting connections and then distributing them to multiple application processes.)\nIf you are okay with not getting an immediate response, you can let stuff queue up. (cue celery, a task queue, which worker processes can use to retrieve the next thing to be done, and deposit results). This works best if you don't need a response in the same request-response cycle; e.g. you submit a job from client, and they only get an acknowledgement that the job has been received; you would need a second request to ask about the status of the job, and possibly the results of the job if it is finished.\nAlternately, instead of Flask you could use websockets or Tornado, to push out the response to the client when it is available (as opposed to user polling for results, or waiting on a live HTTP connection and taking up a server process).","Q_Score":4,"Tags":"python,concurrency,celery,gunicorn","A_Id":53845615,"CreationDate":"2018-12-19T06:05:00.000","Title":"gunicorn and\/or celery: What is the way get the best out of both?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Is there any way to filter out responses by custom_variables?\nI have set custom_varibles in weblink collector, now need to filter it by the variable I have set. Or Is their another way of setting a unique value, like email\/username with weblink collector type and filter the responses by this unique value.\nI am Currently redirecting to SurveyMonkey weblink with email as a custom_variable, now I need to identify the response with this email.\nEDIT: Is this Possible?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":97,"Q_Id":53847920,"Users Score":1,"Answer":"It's on our upcoming roadmap.\nIn the meantime, use \"?c=whatever_string_you_want\" and use the \"custom\" responses filter.","Q_Score":1,"Tags":"django,python-3.x,web,surveymonkey","A_Id":53856271,"CreationDate":"2018-12-19T09:13:00.000","Title":"SurveyMonkey : How to Filter responses by custom_variables","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to run my Python code in raspberry Pi 3 and I keep getting the error: ImportError: no module named playsound. I have already successfully installed playsound (using the command: pip install playsound).","AnswerCount":5,"Available Count":4,"Score":0.0,"is_accepted":false,"ViewCount":23474,"Q_Id":53851972,"Users Score":0,"Answer":"In my case, one module worked with pip3 install pygame but not playsound. I snooped through python files to see the difference between pygame and playsound. I found out that playsound was not in its folder: C:\\Users\\USER\\AppData\\Local\\Programs\\Python\\Python39\\Lib\\site-packages.\nSo I moved it to C:\\Users\\USER\\AppData\\Local\\Programs\\Python\\Python39\\Lib\\site-packages\\playsound-1.2.2.dist-info\nBut remember to put it back after compiling it so you can use the module. Somehow it worked for me.","Q_Score":0,"Tags":"python,raspberry-pi3,raspbian,importerror,python-playsound","A_Id":67811688,"CreationDate":"2018-12-19T13:10:00.000","Title":"ImportError: no module named playsound","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to run my Python code in raspberry Pi 3 and I keep getting the error: ImportError: no module named playsound. I have already successfully installed playsound (using the command: pip install playsound).","AnswerCount":5,"Available Count":4,"Score":0.1194272985,"is_accepted":false,"ViewCount":23474,"Q_Id":53851972,"Users Score":3,"Answer":"Just change from playsound import playsound to import playsound","Q_Score":0,"Tags":"python,raspberry-pi3,raspbian,importerror,python-playsound","A_Id":58259842,"CreationDate":"2018-12-19T13:10:00.000","Title":"ImportError: no module named playsound","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to run my Python code in raspberry Pi 3 and I keep getting the error: ImportError: no module named playsound. I have already successfully installed playsound (using the command: pip install playsound).","AnswerCount":5,"Available Count":4,"Score":0.0399786803,"is_accepted":false,"ViewCount":23474,"Q_Id":53851972,"Users Score":1,"Answer":"The best solution that worked for me is uninstalling playsound using pip uninstall playsound and then installing it again using pip install playsound.","Q_Score":0,"Tags":"python,raspberry-pi3,raspbian,importerror,python-playsound","A_Id":62380329,"CreationDate":"2018-12-19T13:10:00.000","Title":"ImportError: no module named playsound","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to run my Python code in raspberry Pi 3 and I keep getting the error: ImportError: no module named playsound. I have already successfully installed playsound (using the command: pip install playsound).","AnswerCount":5,"Available Count":4,"Score":-0.0399786803,"is_accepted":false,"ViewCount":23474,"Q_Id":53851972,"Users Score":-1,"Answer":"The problem according to the best of my knowledge, it is the environment, by default the raspberry pi is running python2 on the command terminal, and I guess you are running your program on thonny idle or the python3 idle, so what you are doing is your are using python2 environment to install playsound(Terminal) and then using the python3 environment to run your program.\nSo what I did is i used this command on the terminal\nsudo apt-get remove python2.7 --purge\nsudo apt-get install python3.5\npip3 install playsound\nand behold no module error.","Q_Score":0,"Tags":"python,raspberry-pi3,raspbian,importerror,python-playsound","A_Id":66258752,"CreationDate":"2018-12-19T13:10:00.000","Title":"ImportError: no module named playsound","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have been using django for a while, but there is something im not quite clear on. \nHow big should a django app be. If for example a django app should only be user authentication or if it should be an entire website in one app.\nIf I have a project with several apps and each app is a whole website with a lot of code, is that the way it suppose to be or should all apps related to a single site within a project ?\nIm thinking of creating one django project for each site, but im now wondering if I should be creating one project where each app is one site. Can anyone please comment on this, what it the preferred way to do it ?\nIn the django documentation one app is only used for a poll, so it seems to be that, according to the documentation, that each app should be some part of functionality on the site.","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":69,"Q_Id":53854001,"Users Score":1,"Answer":"An app is a submodule of a project which contains functionality (views, models, urls etc) for a specific part of the larger site and is as decoupled from the other apps as possible. The project as a whole is the website and your apps make up the separate parts of functionality for your site.\nIf your sites are going to basically contain the same functionality, it might be worth looking into the Sites framework which django provides.\nSo taking the polls example further.\nLets say the website is a survey site. There would be the polls app, which would contain the relevant models and views for creating and recording poll results. Then you might need to view the data, so you could create an analysis app, which would store the views for displaying dashboards and contain functions for data processing. Then we could take things a bit further, and have users be able to log in and see their own results (and give us the chance to link users to poll results), so you would make an accounts app, which would hold views for logging in\/out, maybe a profile page etc.\nSo each of these different parts of functionality would be separated out into distinct apps, which would make up the project (site) as a whole.\nIf the apps have been decoupled properly, you could reuse the different apps in other projects (e.g. the accounts app could be dropped into a new project do provide logging in\/out functionality)","Q_Score":0,"Tags":"python,django","A_Id":53854111,"CreationDate":"2018-12-19T15:07:00.000","Title":"Is a django project only meant to be for a single website or can the different apps be different sites. What is perferable and advisable?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have been using django for a while, but there is something im not quite clear on. \nHow big should a django app be. If for example a django app should only be user authentication or if it should be an entire website in one app.\nIf I have a project with several apps and each app is a whole website with a lot of code, is that the way it suppose to be or should all apps related to a single site within a project ?\nIm thinking of creating one django project for each site, but im now wondering if I should be creating one project where each app is one site. Can anyone please comment on this, what it the preferred way to do it ?\nIn the django documentation one app is only used for a poll, so it seems to be that, according to the documentation, that each app should be some part of functionality on the site.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":69,"Q_Id":53854001,"Users Score":0,"Answer":"In my experience so far, an app should be a reusable entity. There many guiding principles for choosing what to go and what not in an app. Separating authentication is one example. A projcet is one big collection of may apps and a reusable app can be in many projects. \nNowadays, there is a trend to move to micro service architecture, which is next level of separation of functionality with each service doing best one thing.\nEach project is a unit in itself, not an individual app. So you host the project, not the app. I recommend using different project for each site and using micro-service architecture. A lot depends on your existing codebase too.","Q_Score":0,"Tags":"python,django","A_Id":53854217,"CreationDate":"2018-12-19T15:07:00.000","Title":"Is a django project only meant to be for a single website or can the different apps be different sites. What is perferable and advisable?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need a thread running when I start my django server, basically the thread just periodically processes some items from a database.\nWhere is the best place to start this thread.","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":85,"Q_Id":53862839,"Users Score":2,"Answer":"I think this is generally a bad idea. You shouldn't have that kind of periodic threads running in the frontend process.\nI would create a management command that will do the processing. Then I would set up a cron job (or any other mechanic provided by the hosting) calling the management command. This way you divide the work to logic places and you can also test the processing much easier.","Q_Score":0,"Tags":"python,django","A_Id":53864009,"CreationDate":"2018-12-20T05:24:00.000","Title":"Where should I start a new thread when the django server starts","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on a tool for my company created to get data from our Facebook publications. It has not been working for a while, so I have to get all the historical data from June to November 2018.    \nMy two scripts (one that get title and type of publication, and the other that get the number of link clicks) are working well to get data from last pushes, but when I try to add a date range in my Graph API request, I have some issues:\n\nthe regular query is [page_id]\/posts?fields=id,created_time,link,type,name\nthe query for historical data is [page_id]\/posts?fields=id,created_time,link,type,name,since=1529280000&until=1529712000, as the API is supposed to work with unixtime\nI get perfect results for regular use, but the results for historical data only shows video publications in Graph API Explorer, with a debug message saying:\n\n\nThe since field does not exist on the PagePost object.\n\nSame for \"until\" field when not using \"since\". I tried to replace \"posts\/\" with \"feed\/\" but it returned the exact same result...\nDo you have any idea of how to get all the publications from a Page I own on a certain date range?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":356,"Q_Id":53883849,"Users Score":0,"Answer":"So it seems that it is not possible to request this kind of data unfortunately, third party services must be used...","Q_Score":0,"Tags":"python,facebook,facebook-graph-api,unix-timestamp","A_Id":53889179,"CreationDate":"2018-12-21T11:15:00.000","Title":"Date Range for Facebook Graph API request on posts level","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am having application on EC2 that requires to send an email.\nI am using Django with AWS, and module of 'django-ses-gateway' to send an email.\nEC2 is configured, hence on ~\/.aws folder I am having appropriate credentials file with region as 'default'\nHowever, whenever application tries to send an email by default it is trying to use  \"EU-WEST-1\" region which is not expected one, as it should use \"US-EAST-1\".\nBecause of wrong region, application fails.\nPS:\nI also verified that \"settings.py\" file is not overwriting region,","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":153,"Q_Id":53884062,"Users Score":0,"Answer":"Finally, got the solution.\n'django_ses_gateway' (version 0.1.1) module of python has a bug.\nBy default, it selects EU-WEST-1 region, \nhence,  'sending_mail.py' file requires correction to not to hard-cord a region of EU.\nThe location of installed package can be found using 'pip3 show django-ses-gateway' command","Q_Score":0,"Tags":"django,python-3.x,amazon-web-services,amazon-ses","A_Id":54110882,"CreationDate":"2018-12-21T11:31:00.000","Title":"Django (django-ses-gateway) gives default region as EU-WEST-1 instead of US-EAST-1","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"As a legacy from the previous version of our system, I have around 1 TB of old video files on AWS S3 bucket. Now we decided to migrate to AWS Media Services and all those files should be moved to MediaStore for the access unification.\nQ: Is there any way to move the data programmatically from S3 to MediaStore directly?\nAfter reading AWS API docs for these services, the best solution I've found is to run a custom Python script on an intermediate EC2 instance and pass the data through it.\nAlso, I have an assumption, based on pricing, data organization and some pieces in docs, that MediaStore built on top of S3. That's why I hope to find a more native way to move the data between them.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":376,"Q_Id":53897584,"Users Score":0,"Answer":"I've clarified this with AWS support. There is no way to transfer files directly, although, it's a popular question and, probably, will be implemented.\nNow I'm doing this with an intermediate EC2 server, a speed of internal AWS connections between this, S3 and MediaStore is quite good. So I would recommend this way, at least, for now.","Q_Score":0,"Tags":"python,amazon-web-services,amazon-s3,amazon-ec2,aws-mediastore","A_Id":53904676,"CreationDate":"2018-12-22T16:52:00.000","Title":"Move objects from AWS S3 to MediaStore","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am setting up module in odoo where need to mainain orignal data of one model (Registrations) as logs into other model (RegistrationLogs).\nI want to insert Registration model's data into RegistrationLogs via wizard call and orignal model's data need to be updated.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":511,"Q_Id":53901476,"Users Score":0,"Answer":"you can add many2one field on registration.logs model to comodel registraion, on create function of model registration, hit create function of registration.logs too. to update data, setting up fields on registration logs model to computed or related will be needed.","Q_Score":0,"Tags":"python,odoo","A_Id":53918436,"CreationDate":"2018-12-23T05:41:00.000","Title":"How to insert one model's data into another model in odoo 10?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to extract the text just after strong tag from html page given below? how can i do it using beautiful soup. It is causing me problem as it doesn't have any class or id so only way to select this tag is using text.\n{strong}Name:{\/strong} Sam smith{br}\nRequired result\nSam smith","AnswerCount":1,"Available Count":1,"Score":-0.1973753202,"is_accepted":false,"ViewCount":77,"Q_Id":53914377,"Users Score":-1,"Answer":"Thanks for all your answers but i was able to do this by following:\nb_el = soup.find('strong',text='Name:')\nprint b_el.next_sibling\nThis works fine for me. This prints just next sibling how can i print next 2 sibling is there anyway ?","Q_Score":0,"Tags":"python,web-scraping,beautifulsoup","A_Id":53914744,"CreationDate":"2018-12-24T13:58:00.000","Title":"extracting text just after a particular tag using beautifulsoup?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to call a function from a python file that is located outside the django project directory from views.py. I have tried importing the python file but running the django server says \"no module named xxxx\".\nTree structure is given below.\n\n\n\u251c\u2500\u2500 auto_flash\n\u2502\u00a0\u00a0 \u251c\u2500\u2500 __init__.py\n\u2502\u00a0\u00a0 \u2514\u2500\u2500 test.py\n\u2514\u2500\u2500 fireflash\n    \u251c\u2500\u2500 detection_reports\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 admin.py\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 admin.pyc\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 __init__.py\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 __init__.pyc\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 migrations\n    \u2502\u00a0\u00a0 \u2502\u00a0\u00a0 \u251c\u2500\u2500 __init__.py\n    \u2502\u00a0\u00a0 \u2502\u00a0\u00a0 \u2514\u2500\u2500 __init__.pyc\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 models.py\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 models.pyc\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 __pycache__\n    \u2502\u00a0\u00a0 \u2502\u00a0\u00a0 \u2514\u2500\u2500 __init__.cpython-35.pyc\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 templates\n    \u2502\u00a0\u00a0 \u2502\u00a0\u00a0 \u2514\u2500\u2500 detection_reports\n    \u2502\u00a0\u00a0 \u2502\u00a0\u00a0     \u2514\u2500\u2500 home.html\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 tests.py\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 views.py\n    \u2502\u00a0\u00a0 \u2514\u2500\u2500 views.pyc\n    \u251c\u2500\u2500 fireflash\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 __init__.py\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 __init__.pyc\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 __pycache__\n    \u2502\u00a0\u00a0 \u2502\u00a0\u00a0 \u251c\u2500\u2500 __init__.cpython-35.pyc\n    \u2502\u00a0\u00a0 \u2502\u00a0\u00a0 \u2514\u2500\u2500 settings.cpython-35.pyc\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 settings.py\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 settings.pyc\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 ui_cgi.py\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 urls.py\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 urls.pyc\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 wsgi.py\n    \u2502\u00a0\u00a0 \u2514\u2500\u2500 wsgi.pyc\n    \u251c\u2500\u2500 __init__.py\n    \u2514\u2500\u2500 manage.py  \n\nProject name here is \"fireflash\" and there is an app in that project named \"detection_reports\". There is another directory named \"auto_flash\" that has same location as \"fireflash\". What I want to do is to import test.py file from \"auto_flash\" in detection_reports.views and call a function from views. Importing like this \"from auto_flash import test\" throws error \"no module named auto_flash\".","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":2173,"Q_Id":53916918,"Users Score":0,"Answer":"I have tried all of the above mentioned solutions, but the cleaner solution was to append the path for auto_flash to syspath and the issue was resolved. Thanks to all of you for the efforts.","Q_Score":1,"Tags":"python,django,django-views","A_Id":53986048,"CreationDate":"2018-12-24T19:00:00.000","Title":"How to import python function from another file into django views","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to call a function from a python file that is located outside the django project directory from views.py. I have tried importing the python file but running the django server says \"no module named xxxx\".\nTree structure is given below.\n\n\n\u251c\u2500\u2500 auto_flash\n\u2502\u00a0\u00a0 \u251c\u2500\u2500 __init__.py\n\u2502\u00a0\u00a0 \u2514\u2500\u2500 test.py\n\u2514\u2500\u2500 fireflash\n    \u251c\u2500\u2500 detection_reports\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 admin.py\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 admin.pyc\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 __init__.py\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 __init__.pyc\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 migrations\n    \u2502\u00a0\u00a0 \u2502\u00a0\u00a0 \u251c\u2500\u2500 __init__.py\n    \u2502\u00a0\u00a0 \u2502\u00a0\u00a0 \u2514\u2500\u2500 __init__.pyc\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 models.py\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 models.pyc\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 __pycache__\n    \u2502\u00a0\u00a0 \u2502\u00a0\u00a0 \u2514\u2500\u2500 __init__.cpython-35.pyc\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 templates\n    \u2502\u00a0\u00a0 \u2502\u00a0\u00a0 \u2514\u2500\u2500 detection_reports\n    \u2502\u00a0\u00a0 \u2502\u00a0\u00a0     \u2514\u2500\u2500 home.html\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 tests.py\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 views.py\n    \u2502\u00a0\u00a0 \u2514\u2500\u2500 views.pyc\n    \u251c\u2500\u2500 fireflash\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 __init__.py\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 __init__.pyc\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 __pycache__\n    \u2502\u00a0\u00a0 \u2502\u00a0\u00a0 \u251c\u2500\u2500 __init__.cpython-35.pyc\n    \u2502\u00a0\u00a0 \u2502\u00a0\u00a0 \u2514\u2500\u2500 settings.cpython-35.pyc\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 settings.py\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 settings.pyc\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 ui_cgi.py\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 urls.py\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 urls.pyc\n    \u2502\u00a0\u00a0 \u251c\u2500\u2500 wsgi.py\n    \u2502\u00a0\u00a0 \u2514\u2500\u2500 wsgi.pyc\n    \u251c\u2500\u2500 __init__.py\n    \u2514\u2500\u2500 manage.py  \n\nProject name here is \"fireflash\" and there is an app in that project named \"detection_reports\". There is another directory named \"auto_flash\" that has same location as \"fireflash\". What I want to do is to import test.py file from \"auto_flash\" in detection_reports.views and call a function from views. Importing like this \"from auto_flash import test\" throws error \"no module named auto_flash\".","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":2173,"Q_Id":53916918,"Users Score":0,"Answer":"Move auto_flash to fireflash\nIn detection_reports add from auto_flash import test.py","Q_Score":1,"Tags":"python,django,django-views","A_Id":53935367,"CreationDate":"2018-12-24T19:00:00.000","Title":"How to import python function from another file into django views","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm creating documents from web scraping in python and uploading them to Firestore.\nTo do so I'm adding them to a dictionary and uploading them from a for loop in python, one by one(ideally would be better to upload the collection at once, but that doesn't seem an option). I want to use batches, however they have the 500 limit per batch and I need to do more than 100,000 operations. The operations are merely set() operations and a couple of update()\nIs there a function to know the current size of the batch so I can reinitialize it?\nWhat is the best way to use batches for more than 500 operations in python?","AnswerCount":3,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":1725,"Q_Id":53921109,"Users Score":3,"Answer":"The maximum number of operations in a Batch is 500. If you need more operations, you'll need multiple batches.\nThere is no API to determine the current number of operations in a Batch. If you need that, you will have to track it yourself.","Q_Score":3,"Tags":"python,firebase,google-cloud-firestore","A_Id":53921780,"CreationDate":"2018-12-25T09:39:00.000","Title":"How to batch more than 500 operations in python for firestore?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I just started with AWS and I want to train my own model with own dataset. I have my model as keras model with tensorflow backend in Python. I read some documentations, they say I need a Docker image to load my model. So, how do I convert keras model into Docker image. I searched through internet but found nothing that explained the process clearly. How to make docker image of keras model, how to load it to sagemaker. And also how to load my data from a h5 file into S3 bucket for training? Can anyone please help me in getting clear explanation?","AnswerCount":4,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2089,"Q_Id":53921454,"Users Score":0,"Answer":"You can convert your Keras model to a tf.estimator and train using the TensorFlow framework estimators in Sagemaker.\nThis conversion is pretty basic though, I reimplemented my models in TensorFlow using the tf.keras API which makes the model nearly identical and train with the Sagemaker TF estimator in script mode.\nMy initial approach using pure Keras models was based on bring-your-own-algo containers similar to the answer by Matthew Arthur.","Q_Score":0,"Tags":"python,amazon-web-services,tensorflow,keras,amazon-sagemaker","A_Id":54089983,"CreationDate":"2018-12-25T10:26:00.000","Title":"How to train your own model in AWS Sagemaker?","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to Celery and I am trying to understand how queues work. If I have two tasks say task1 and task2 and I place them in different queues and on task1 I use only a single worker and on task2 I use multiple works, will task1 only run one at a time since I only have a single worker? and will task2 run as many as many times as I have workers? Is my understanding correct?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1310,"Q_Id":53927477,"Users Score":0,"Answer":"task2 will not be executed as many times as you have workers on that queue, this task will be distributed to one of workers that will be available at that moment of time.","Q_Score":1,"Tags":"python,celery,django-celery,celery-task,celerybeat","A_Id":54287760,"CreationDate":"2018-12-26T04:39:00.000","Title":"Celery distributing Queues and Workers","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am new to Django and am trying to figure out how to store historical data and be able to reference any data point from a date in the past. Say I want to store data on a kids height change as he grows and be able to compare his height at day 400 to his height at day 6xx. How would I set this up in Django? Would there need to be a foreign key relationship between height and the kid?","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":3432,"Q_Id":53946871,"Users Score":2,"Answer":"Forget about Django's ORM (which is really just a very thin wrapper over your SQL database) and think in terms of relational database. Here you obviously have two entities: \"kid\" and \"height\". You also have the following relationships: a \"kid\" has zero, one or many \"height\", a \"height\" belongs to one single \"kid\". This indeed translates to a \"kid\" table  kid(+id, name, dob, ...) and a \"height\" table with a foreign key on kid: height(+id, kid_id, date, value).\nHow to write this using Django's orm is quite straighforward so I'll leave it to you.","Q_Score":2,"Tags":"python,django,sqlite,historical-db","A_Id":53947069,"CreationDate":"2018-12-27T14:49:00.000","Title":"How to store historical data using Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created a machine learning algorithm in Python that is served through a REST API and would like to implement it on Google Cloud \/ Amazon EC2 to make real-time predictions. Before I do this, I would like to create a 'log' of every request\/prediction that comes in\/out of the model - this seems like good practice to me and may also help with creating unique prediction identifiers. Just a simple 1 or 0 stored in a database with a datetime stamp and unique ID.\nHow should I send this data to the database without impacting the run time of the model? An INSERT INTO statement in the API? A seperate API altogether?\nThank you very much for your help!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":344,"Q_Id":53948225,"Users Score":1,"Answer":"It depends on the latency of the results. If you want it to persist data in the db instantly then an API has to be made instantly when you have received the request. As these will be log files by nature my recommendation would be to store locally and insert the logs once in a day to reduce the network congestion over the time. If your existing API is already connected to db and then I do not see a point of creating a new API altogether for a simple post call","Q_Score":0,"Tags":"python,database,machine-learning,server,google-cloud-platform","A_Id":53948363,"CreationDate":"2018-12-27T16:43:00.000","Title":"How to connect machine learning algorithm to database","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Like in php, include() method and allow_url_include can be vulnerable to LFI and RFI.\nDoes django's include is vulnerable to lfi and RFI?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":1355,"Q_Id":53953542,"Users Score":2,"Answer":"Not unless you mess with the default template loaders. Django doesn't let you include files located outside of the application's templates folders and does its best to prevent you from touching external files using built-in operations.\nAs a general rule of thumb, it doesn't hurt to keep your application code completely isolated from the path where a user can upload files and to sanitize and reduce user-provided input's interactions with potentially dangerous functions.","Q_Score":2,"Tags":"python,django,remote-file-inclusion","A_Id":53954207,"CreationDate":"2018-12-28T04:02:00.000","Title":"Is Django framework vulnerable to local file inclusion(LFI) and remote file inclusion(RFI)?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Flask application and it is working well on my workstation. But when I am deploying my application using Gunicorn in a VM. I am getting this\n\nErrno 5: Input\/Output error\n\nThis error comes sometimes on startup of application or sometimes after that, I mean the application behaving weirdly. I googled the error but not able to find an appropriate answer that can solve my problem. \nDoes anybody know the exact reason behind it?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":571,"Q_Id":53954947,"Users Score":1,"Answer":"Hey is your gunicorn running as daemon on vm ??\nIf gunicorn runs in daemon then master thread sends the SIGWINCH to its child processes which is graceful termination of them. \n1.)if you are trying to daemonize gunicorn then don't go with '&' at the end of it to daemonize it. Instead use any process manager like supervisor else run it as a service.\n2.)Or you can always run gunicorn inside a docker container via combination of CMD and ENTRYPPOINT.  Which in turn will not have any need of daemonizing gunicorn process. and will remain at PID1 in container. \nI guess this should solve your problem.","Q_Score":0,"Tags":"python,flask,deployment,virtual-machine,gunicorn","A_Id":53955084,"CreationDate":"2018-12-28T07:14:00.000","Title":"\"Errno 5- Input\/output error\" while deploying app using gunicorn in a cloud VM","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am making a browser-based multiplayer game. \nIn the game, registered players can \"attack\" other players. Once a player has \"attacked\" a player he must wait 30 minutes before his ability to 'attack' again is reset.\nI have an idea of implementing this but am not sure if my approach is bad practice:\nI thought about adding a \"TimeToReset\" field in the database to each registered user and fill that field with a timer object. Once a player 'attacks' his 'TimeToReset' field starts counting down from 30 minutes to 0.\nand then have the application continuously query all the users in the database with a while True loop, looking for users that their \"TimeToReset\" reached 0. And then run code to reset their ability to 'attack' again.\nI am not sure how efficient my approach or if it is even possible is and would love some input. So to summarize:\n1)Is it ok to store a timer\/stopwatch object(which continuously changes) in a database?\n2)Is it efficient to continuously run a while true loop to query the database?\nOr if is there a better approach to implement this feature I would love to hear it.\nThank you","AnswerCount":1,"Available Count":1,"Score":0.537049567,"is_accepted":false,"ViewCount":102,"Q_Id":53958039,"Users Score":3,"Answer":"I'm not sure what the benefit of doing this would be. Surely all you need to do is to store the time of the last attack for each user, and just disallow attacks if that is less than 30 minutes before the current time.","Q_Score":1,"Tags":"python,django","A_Id":53958195,"CreationDate":"2018-12-28T11:41:00.000","Title":"Is it bad practice to store a timer object in a database and also have the program continuously query in Django?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am learning Python 3.x together with Flask. I'm also a Basketball fan, so I thought I'd be a good idea to get in the water and try to do a game simulator, perhaps only between two teams to begin with - and learn more Python along the way.\nMy biggest question for start is what should the logic behind the simulator be? Let's say I want to sim two historic teams - Lakers00 vs Bulls 98. Stats of the players are available online.\nI want it to be \"realistic,\" so perhaps getting into percentages of each player? If Jordan shot let's say 50% for the season - should that be programmed into each 'player' and then tell what's the chance that the % is higher or lower than that in each simulation? Should I use .json to store the data?\nOr is there a completely different approach I should take?\nOnce the code is in, I would ideally try to turn that into a website with Flask. What database would you recommend to use?\nThank you","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":628,"Q_Id":53962256,"Users Score":0,"Answer":"I don't know JSON, but I'd start with keeping it simple, if you're still working on this.\n1: Players should have at least the following fields:\n         Breakdown of possession usage (TO, 2 Pt shot, 3 pt shot)\n         2 pt shooting percentage, 3 pt shooting percentage\n2: I'd probably start by including something like usage percentage\nThe simplest way to do it would be have a player class with those attributes. If you took the advice of #2 you could use a function to pull out which player used the possession, and what they did with it (2 pt shot, 3 pt shot, turnover, and whether the shot was successful). Defense, rebounds, fouls might be more for later versions of the game, but if you start with that you'll at least have something that resembles basketball. I think NBA games are roughly 100 possessions.","Q_Score":0,"Tags":"python-3.x","A_Id":56329485,"CreationDate":"2018-12-28T17:35:00.000","Title":"Logic behind creating a basketball simulator with Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am learning Python 3.x together with Flask. I'm also a Basketball fan, so I thought I'd be a good idea to get in the water and try to do a game simulator, perhaps only between two teams to begin with - and learn more Python along the way.\nMy biggest question for start is what should the logic behind the simulator be? Let's say I want to sim two historic teams - Lakers00 vs Bulls 98. Stats of the players are available online.\nI want it to be \"realistic,\" so perhaps getting into percentages of each player? If Jordan shot let's say 50% for the season - should that be programmed into each 'player' and then tell what's the chance that the % is higher or lower than that in each simulation? Should I use .json to store the data?\nOr is there a completely different approach I should take?\nOnce the code is in, I would ideally try to turn that into a website with Flask. What database would you recommend to use?\nThank you","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":628,"Q_Id":53962256,"Users Score":0,"Answer":"I imagine you will want a to rig up a modifier to help compare teams from different eras. Defensive rules have changed over the ages and its had a great effect on field goal percentages, as have things like pace of play.","Q_Score":0,"Tags":"python-3.x","A_Id":53962328,"CreationDate":"2018-12-28T17:35:00.000","Title":"Logic behind creating a basketball simulator with Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it a best way to create only one file of forms and one files of models in the folder of the project django? \nCreate for each application one forms.py and one models.py is too long.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":33,"Q_Id":53964425,"Users Score":0,"Answer":"django apps are meant to be standalone.\nSo models and forms related to an app should be within that app.\nFor example, you have a website in which you also have a blog.\nNow you have a seperate app for that blog.  \nSo models related to blog (say Blog) should recide in blog\/models.py and forms related to bog (say BlogCreateForm) should recide in blog\/forms.py\nThis is the general convention that is followed. However in many cases it not really possibe to seperate a part of project as 'standalone'. \nUnnecessirly splitting project in apps may actually make it more difficult\nFor example , if you are making something for a school, \nthen it makes sense to create 2 apps teachers and students ONLY IF, you have many urls starting with something like\nwww.example.com\/teachers\/ and www.example.com\/students\/ \notherwise it makes more sense to just put the teacher and student model in the registration app where models like user, profile etc  recide.\nBut as @Toby mentioned, it entirely depends on the structure of your project and your use case","Q_Score":0,"Tags":"django,python-3.x","A_Id":53967143,"CreationDate":"2018-12-28T21:23:00.000","Title":"Where to creat forms an models","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have both python2 and python3 installed on my ubuntu machine.\nAlso I have both versions of Django[Django 1.11 and Django 2.1.3] \nInstalled.\nWhenever I make a new project in django.\ndjango-admin is using Django 1.11 by default\nHow do I create a project in Django 2.1.3 instead of Django 1.11??\nI tried using virtualenv but its not working correctly ??","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":461,"Q_Id":53976077,"Users Score":0,"Answer":"Removing the old Django version works for me.","Q_Score":1,"Tags":"python,django,python-3.x,django-admin","A_Id":56469790,"CreationDate":"2018-12-30T08:02:00.000","Title":"django-admin.py is using Django 1.11 instead of Django 2","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have both python2 and python3 installed on my ubuntu machine.\nAlso I have both versions of Django[Django 1.11 and Django 2.1.3] \nInstalled.\nWhenever I make a new project in django.\ndjango-admin is using Django 1.11 by default\nHow do I create a project in Django 2.1.3 instead of Django 1.11??\nI tried using virtualenv but its not working correctly ??","AnswerCount":3,"Available Count":2,"Score":0.0665680765,"is_accepted":false,"ViewCount":461,"Q_Id":53976077,"Users Score":1,"Answer":"I was facing the same issue and I have resolved it now. You can do the following steps:\n1) Run which django-admin it should show the path to django-admin 1.11.\n2) Copy the path printed after above command. Let path be \n3) Run the following command: rm -rf <path>","Q_Score":1,"Tags":"python,django,python-3.x,django-admin","A_Id":62048015,"CreationDate":"2018-12-30T08:02:00.000","Title":"django-admin.py is using Django 1.11 instead of Django 2","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"ive made a mistake with my django and messed up my model\nI want to delete it & then recreate it - how do I do that?\nI get this when I try to migrate - i just want to drop it\nrelation \"netshock_todo\" already exists\nThanks in advance","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":173,"Q_Id":53978491,"Users Score":1,"Answer":"Delete all of your migrations file except __init__.py\nThen go to database and find migrations table, delete all row in migrations table. Then run makemigrations and migrate command","Q_Score":0,"Tags":"django,python-3.x","A_Id":53978508,"CreationDate":"2018-12-30T14:34:00.000","Title":"how to delete django relation and rebuild model","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on a attendance registration system where a user of an office can make a leave request. When any user makes a leave request, it must be notified to admin. How do I implement it ?\nI had seen django-fcm for push notification. But I am using django rest framework . Can I implement django-fcm with django rest ? \nIf any tutorials link would be more helpful","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":545,"Q_Id":53983887,"Users Score":1,"Answer":"This is not a very hard, clone the fcm-django-web-demo project and try coding in Django shell...","Q_Score":0,"Tags":"python,django,django-rest-framework,django-notification","A_Id":53984157,"CreationDate":"2018-12-31T05:25:00.000","Title":"Push notification in django rest","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to use Scrapy shell to try and figure out the selectors for zone-h.org. I run scrapy shell 'webpage' afterwards I tried to view the content to be sure that it is downloaded. But all I can see is a dash icon (-). It doesn't download the page. I tried to enter the website to check if my connection to the website is somehow blocked, but it was reachable. I tried setting user agent to something more generic like chrome but no luck there either. The website is blocking me somehow but I don't know how can I bypass it. I digged through the the website if they block crawling and it doesn't say it is forbidden to crawl it. Can anyone help out?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":621,"Q_Id":53988585,"Users Score":0,"Answer":"Can you use scrapy shell \"webpage\" on another webpage that you know works\/doesn't block scraping?\nHave you tried using the view(response) command to open up what scrapy sees in a web browser?\nWhen you go to the webpage using a normal browser, are you redirected to another, final homepage?\n- if so, try using the final homepage's URL in your scrapy shell command\nDo you have firewalls that could interfere with a Python\/commandline app from connecting to the internet?","Q_Score":1,"Tags":"python,scrapy,web-crawler","A_Id":53989874,"CreationDate":"2018-12-31T14:33:00.000","Title":"Scrapy shell doesn't crawl web page","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using the peewee ORM to manage a few Postgres databases. I've recently had a problem where the primary keys are not being automatically added when save() or execute() is called like it should be.\nHere's the code that's being called:\nMacro.insert(name=name, display_text=text).on_conflict(conflict_target=(Macro.name,), preserve=(Macro.display_text,), update={Macro.name: name}).execute()\n\nHere's the error:\nCommand raised an exception: IntegrityError: null value in column \"id\" violates non-null constraint; \nDETAIL: Failing row contains (null, nametexthere, displaytexthere)\nThe macro class has an id (AutoField [set to be primary key]), name (CharField), and display_text (CharField). I've tried using the built in PrimaryKeyField and an IntegerField set to primary key to no change.\nBefore, I was using Heroku with no issue. I've since migrated my apps to my Raspberry Pi and that's when this issue popped up.\nThis also isn't the only case where I've had this problem. I have another database with the same AutoField primary key that seems to have broken from the transition from Heroku to Pi. That one uses the save() method rather than insert()\/execute(), but the failing row error still shows up.\nShould also mention that other non-insert queries work fine. I can still select without issue.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":344,"Q_Id":53992747,"Users Score":1,"Answer":"The problem didn't have anything to do with Peewee, it had to do with the dump. Heroku does not dump sequences for you automatically, so I had to add them all again manually. Once those was added the connections worked fine.","Q_Score":0,"Tags":"python,postgresql,peewee","A_Id":53996728,"CreationDate":"2019-01-01T02:50:00.000","Title":"Peewee primary keys not showing up (Failing row contains null)","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have 3-4 django background_tasks which run in parallel, and I want to stop all tasks except a single one of them. background_task is a built-in library in django. How can I solve this issue?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1231,"Q_Id":54005945,"Users Score":0,"Answer":"First need to stop the process\/tab that is running python manage.py process_tasks.\nNext, delete the task you no longer need from the database - you can find this in the admin panel, then, restart the process\npython manage.py process_tasks","Q_Score":0,"Tags":"python,django,background-task","A_Id":57543746,"CreationDate":"2019-01-02T11:57:00.000","Title":"How can i stop django background task permanently which is running parallely?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm a self-taught programmer and a lot of the problems I encounter come from a lack of formal education (and often also experience).\nMy question it the following: How to rationalize where you store the data a class or function creates? I'll make a simple example:\nCase: I have a webshop (SHOP) with a REST api and a product provider (PROVIDER) also with a REST API. I determine the product, I send that data to PROVIDER who sends me back formatted data that can be read by SHOP to make a working product on the webshop. PROVIDER also has a secondary REST api that provides generated images.\nWhat I would come up with:\nI'd make three classes: ProductBase, Shop and Provider\nProductBase would be the class from where I instantiate and store the individual product information.\nShop would be where I design the api interactions with the webshop.\nProvider same as shop, but for interactions with provider api.\nMy problem: At some point you're creating data that's not clearly separated in concern. For example: Would I store the generated product data (from PROVIDER) in the ProductBase instance I created? It feels like I'm coupling the two classes this way. But it not there, then where?\nWhat if I create product images with PROVIDER and I upload them to SHOP? Do I store the uploaded image-url in PRODUCT? How do you keep track of all this info?  \nThe question I want answered:\nI've read a lot on OOP and Design Patterns, and I have adopted a TDD approach which has greatly helped to improve my code but I haven't found anything on how to approach the flow of at runtime generated data within software engineering.  \nWhat would be a good way to solve above problem(s) and could you explain your rationale for it?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":35,"Q_Id":54006609,"Users Score":1,"Answer":"If I understand correctly, I think your current concern is that you have \"raw\" product data, which you want to store in objects, and you have \"processed\" (formatted) product data, which you also want to store in objects. Your question being should you mix them.\nLet me just first point out the other obvious option. Namely, having two product classes: RawProduct and ProcessedProduct. Which to do?\n(Edit: also, to be sure, product data should not be stored in provider. The provide performs the action of formatting but the data is product data. Not provider data).\nIt depends. There are a couple of considerations:\n1) In general, in OOP, the idea is to couple actions on data with the data. So if possible, you have some method in ProductBase like \"format()\", where format will send the object off to the API to get formatted, and store the result in an instance variable. You can then also have a method like \"find_image\", that goes and fetches the image url from the API and then stores that in a field. An object's data is meant to be dynamic. It is meant to be altered by object methods.\n2) If you need version control (if you want the full history of the object's state to be available), then you can't override fields with new data. So either you need to store a history of every object field in the object, or you need to create new objects. \n3) Is RAM a concern? I sometimes create dataclasses that store only the final part of an object's life so that I can fit more of the objects into memory.\nPersonally I often find myself creating \"RawObject\" and \"ProcessedObject\" classes, it's just easier a lot of the time. But that's probably because I mostly work with document processing, so it's very clear. Usually You'll just update the objects data.\nA benefit of having one object with the full history is that it is much easier to debug. Because the raw data and the API result are in the same object. So you can very easily probe what went wrong. If you start splitting things up it's harder to track. In general, the more information an object has about where it's been, the easier it is to figure out what went wrong with it.\nRemember also though, since this is a Python question, Python is multi-paridigm. And if you're writing pipeline-style architectures (synchronous, linear processes), then a functional approach can also work well. \nOnce your data is stored in a product object, anything can hold a reference to that. So a shop can reference an object and a product can reference the object. Be clear on the difference between \"has-a\" relationships and \"is-a\" relationships.","Q_Score":0,"Tags":"python,rest,class,design-patterns,runtime","A_Id":54006993,"CreationDate":"2019-01-02T12:42:00.000","Title":"What to do with runtime generated data spanning several classes?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am currently scraping a website for work to be able to sort the data locally, however when I do this the code seems to be incomplete, and I feel may be changing whilst I scroll on the website to add more content. Can this happen ? And if so, how can I ensure I am able to scrape the whole website for processing?\nI only currently know some python and html for web scraping, looking into what other elements may be affecting this issue (javascript or ReactJS etc). \nI am expecting to get a list of 50 names when scraping the website, but it only returns 13. I have downloaded the whole HTML file to go through it and none of the other names seem to exist in the file, i.e. why I think the file may be changing dynamically","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":58,"Q_Id":54008539,"Users Score":0,"Answer":"Yes, the content of the HTML can be dynamic, and Javascript loading should be the most essential . For Python, scrapy+splash maybe a good choice to get started. \nDepending on how the data is handled, you can have different methods to handle dyamic content HTML","Q_Score":0,"Tags":"python,web-scraping","A_Id":54008662,"CreationDate":"2019-01-02T14:59:00.000","Title":"The HTML code I scrape seems to be incomplete in comparison to the full website. Could the HTML be changing dynamically?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Load OpenModelica FMU-module (with MSL noise-module) in Python environment with PyFMI does not work.\nI have tried to run exported FMU-modules from OpenModelica in PyFMI-environment. Deterministic models works fine.\nHowever, when I include noise models using the MSL block Modelica.Blocks.Noise.NormalNoise Then I get an FMU that get problems when loading into the PyFMI-environment. The error text ends with:\nFMUException: Error loading the binary. Could not load the DLLL: libModelicaExternalC.so.0: cannot open shared object file: No such file or directory.\nNeedless to say, but in OpenModelica the system with noise works well. The same code in JModelica and compiled and loaded in the Python environment with PyFMI also works well. However, the random noise sequence are different for the same seed in OpenModelica and JModelica indicating some difference. \nFor this example I run JModelica and PyFMI version 2.1 in Docker Linux and OpenModelica is also run in Linux environment. Since Linux in both I can transfer the FMU-model. Both JModelica and OpenModelica support the Modelica standard 3.2.2 and corresponding MSL.\nI have also just tested the example with JModelica and PyFMI version 2.4 (or at least 2.2) using Docker Linux image from mclab. I get the same error text as for 2.1 (and without noise block it works as it did for 2.1). \n\u2014\nMy question is if the described error is on PyFMI or OpenModelica side or perhaps both? Or is there something extra to be done when exporting an FMU from OpenModelica with noise-block that should make it all work?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":561,"Q_Id":54019129,"Users Score":2,"Answer":"From the error message, it indicates that the FMU is missing one of its dependencies, libModelicaExternalC.so (all dependencies of an FMU should be included in the FMU). The problem lies in the generating tool of the FMU, not in PyFMI.","Q_Score":1,"Tags":"python,openmodelica,fmi,jmodelica","A_Id":54038212,"CreationDate":"2019-01-03T09:04:00.000","Title":"FMU-module and transfer from OpenModelica to Python with PyFMI","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Load OpenModelica FMU-module (with MSL noise-module) in Python environment with PyFMI does not work.\nI have tried to run exported FMU-modules from OpenModelica in PyFMI-environment. Deterministic models works fine.\nHowever, when I include noise models using the MSL block Modelica.Blocks.Noise.NormalNoise Then I get an FMU that get problems when loading into the PyFMI-environment. The error text ends with:\nFMUException: Error loading the binary. Could not load the DLLL: libModelicaExternalC.so.0: cannot open shared object file: No such file or directory.\nNeedless to say, but in OpenModelica the system with noise works well. The same code in JModelica and compiled and loaded in the Python environment with PyFMI also works well. However, the random noise sequence are different for the same seed in OpenModelica and JModelica indicating some difference. \nFor this example I run JModelica and PyFMI version 2.1 in Docker Linux and OpenModelica is also run in Linux environment. Since Linux in both I can transfer the FMU-model. Both JModelica and OpenModelica support the Modelica standard 3.2.2 and corresponding MSL.\nI have also just tested the example with JModelica and PyFMI version 2.4 (or at least 2.2) using Docker Linux image from mclab. I get the same error text as for 2.1 (and without noise block it works as it did for 2.1). \n\u2014\nMy question is if the described error is on PyFMI or OpenModelica side or perhaps both? Or is there something extra to be done when exporting an FMU from OpenModelica with noise-block that should make it all work?","AnswerCount":2,"Available Count":2,"Score":0.2913126125,"is_accepted":false,"ViewCount":561,"Q_Id":54019129,"Users Score":3,"Answer":"In OMEdit, set Platfoms to \"Static\" in Tools->Options->FMI before generating the FMU.","Q_Score":1,"Tags":"python,openmodelica,fmi,jmodelica","A_Id":54076154,"CreationDate":"2019-01-03T09:04:00.000","Title":"FMU-module and transfer from OpenModelica to Python with PyFMI","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm wondering about how a dash app works in terms of loading data, parsing and doing initial calcs when serving to a client who logs onto the website.\nFor instance, my app initially loads a bunch of static local csv data, parses a bunch of dates and loads them into a few pandas data frames. This data is then displayed on a map for the client.\nDoes the app have to reload\/parse all of this data every time a client logs onto the website? Or does the dash server load all the data only the first time it is instantiated and then just dish it out every time a client logs on?\nIf the data reloads every time, I would then use quick parsers like udatetime, but if not, id prefer to use a convenient parser like pendulum which isn't as efficient (but wouldn't matter if it only parses once).\nI hope that question makes sense. Thanks in advance!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":50,"Q_Id":54035114,"Users Score":2,"Answer":"The only thing that is called on every page load is the function you can assign to app.layout. This is useful if you want to display dynamic content like the current date on your page.\nEverything else is just executed once when the app is starting. \nThis means if you load your data outside the app.layout (which I assume is the case) everything is loaded just once.","Q_Score":0,"Tags":"python,performance,plotly-dash","A_Id":54173014,"CreationDate":"2019-01-04T08:03:00.000","Title":"Do Dash apps reload all data upon client log in?","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We are using H2O (latest version 3.22.1.1) to read parquet data from s3. We use python to talk to H2O. This is single H2O instance - not cluster.\nSometimes we get this error:\nServer error water.exceptions.H2OIllegalArgumentException:\n  Error: Cannot determine file type. for s3a:\/\/BUCKET_NAME\/5c2e3fdc0c9c1800019c73f9\/part-00001-c33635a2-76dc-4e49-948b-465726b7e3d9-c000.snappy.parquet\nFile exists and is valid parquet file. Subsequent imports work fine.\nThis is our python code to import file into H2O\nh2o.import_file(path='s3a:\/\/BUCKET_NAME\/5c2e3fdc0c9c1800019c73f9\/part-00001-c33635a2-76dc-4e49-948b-465726b7e3d9-c000.snappy.parquet')\nIs there any way to force h2o to use parquet type?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":755,"Q_Id":54039594,"Users Score":0,"Answer":"H20 Manual says to do it like df = h2o.import_file(\"\/pathToFile\/fileName\")  When \n you need to load data from the machine(s) running H2O to the machine running Python. \nSo if your server is not running H20 probably that's why it is showing error.","Q_Score":0,"Tags":"python,amazon-s3,parquet,h2o","A_Id":54040066,"CreationDate":"2019-01-04T13:10:00.000","Title":"h2o and parquet - can not determine file type error","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I had a problem when I needed to update a lot of records using write example: self.sudo().write({'field': True})\nIn this case, took me like 10-15 minutes to do it. However, when I tried with a sql query it took me a few seconds. \nMy doubts are, Why does that happen?, why is it better to use one or the other? or in which cases should I use one or the other?.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":274,"Q_Id":54043580,"Users Score":3,"Answer":"Because there is a lot going on in write not just a query executing. For example:\n\nChecking Model access right.\nChecking record rules access right if there is, and ggis the most heavy step. \nComputing others values that depends on this update if there is. \nPosting mail.thread messages.\nUsing api.one in some method this way odoo will repeat the same steps for each record and execute the query N times (very very bad thing to do) \n\nKeep in mind that using plain SQL will not trigger computing values or security checking so don't use it or use it carefully.","Q_Score":2,"Tags":"python,odoo","A_Id":54045437,"CreationDate":"2019-01-04T17:31:00.000","Title":"Why does sql query works faster with many records in odoo?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"The above mentioned command is not working.\nShowing the result after giving command -\nNo Django settings specified.\nUnknown command: 'startmyproject'. Did you mean startproject?\nType 'django-admin help' for usage.","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1571,"Q_Id":54054418,"Users Score":0,"Answer":"I think you need to run this django-admin startproject 'your peoject name goes here'\nThis should be just after activating virtual and installing django","Q_Score":0,"Tags":"python,django","A_Id":57670708,"CreationDate":"2019-01-05T17:28:00.000","Title":"Django command \"django-admin startmyproject\" not working?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So I have an assignment to build a web interface for a smart sensor, \nI've already written the python code to read the data from the sensor and write it into sqlite3, control the sensor etc. \nI've built the HTML, CSS template and implemented it into Django.\nMy goal is to run the sensor reading script pararel to the Django interface on the same server, so the server will do all the communication with the sensor and the user will be able to read and configure the sensor from the web interface. (Same logic as modern routers - control and configure from a web interface)\nQ: Where do I put my sensor_ctl.py script in my Django project and how I make it to run independent on the server. (To read sensor data 24\/7)\nQ: Where in my Django project I use my classes and method from  sensor_ctl.py to write\/read data to my djangos database instead of the local sqlite3 database (That I've used to test sensor_ctl.py)","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":39,"Q_Id":54057396,"Users Score":1,"Answer":"Place your code in app\/appname\/management\/commands folder. Use Official guide for management commands. Then you will be able to use your custom command like this:\n.\/manage getsensorinfo\nSo when you will have this command registered, you can just  put in in cron and it will be executed every minute.\nSecondly you need to rewrite your code to use django ORM models like this:\nStat.objects.create(temp1=60,temp2=70) instead of INSERT into....","Q_Score":1,"Tags":"django,python-3.x","A_Id":54057526,"CreationDate":"2019-01-05T23:50:00.000","Title":"How do i implement Logic to Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Flask app that uses selenium to get data from a website. I have spent 10+ hours trying to get heroku to work with it, but no success. My main problem is selenium. with heroku, there is a \"buildpack\" that you use to get selenium working with it, but with all the other hosting services, I have found no information. I just would like to know how to get selenium to work with any other recommended service than heroku. Thank you.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":777,"Q_Id":54058237,"Users Score":0,"Answer":"You need hosting service that able to install Chrome, chromedriver and other dependencies. Find for Virtual Private hosting (VPS), or Dedicated Server or Cloud Hosting but not Shared hosting.","Q_Score":1,"Tags":"python,selenium,heroku,hosting","A_Id":54059218,"CreationDate":"2019-01-06T02:49:00.000","Title":"How does selenium work with hosting services?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Hi ultimately I'm trying to install django on my computer, but I'm unable to do this as the when I run pip in the command line I get the following error message:\n''pip' is not recognized as an internal or external command,\noperable program or batch file.'\nI've added the following locations to my path environment:\n'C:\\Python37-32;C:\\Python37-32\\Lib\\site-packages;C:\\Python37-32\\Scripts'\nI've also tried to reinstall pip using 'py -3.7 -m ensurepip -U --default-pip', but then I get the following error message:\n'Requirement already up-to-date: setuptools in c:\\users\\tom_p\\anaconda3\\lib\\site-packages (40.6.3)\nRequirement already up-to-date: pip in c:\\users\\tom_p\\anaconda3\\lib\\site-packages (18.1)\nspyder 3.3.2 requires pyqt5<5.10; python_version >= \"3\", which is not installed.\nxlwings 0.15.1 has requirement pywin32>=224, but you'll have pywin32 223 which is incompatible.'\nI'm new to this so I'm struggling with the install and I'm confused by the fact pip is in C:\\Python37-32\\Scripts, but the above error seems to be looking in the anaconda folder. The only reason I installed anaconda was to use the Spyder IDE.\nI've installed python 3.7 32-bit on my Windows 10, any help would be much appreciated.\nThanks","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":474,"Q_Id":54060243,"Users Score":0,"Answer":"Hi Steve I've just used the below code which seemed to work, as I was told django 2.1.5 successfully installed and I can find a django.js application on my computer.\npy -3.7-32 -mpip install django\nHowever, I'm unable to open this application and when I run the below code I'm seeing the error message: 'C:\\Users\\tom_p\\Anaconda3\\python.exe: No module named django'\npy -m django --version\nI tried to install the 64 bit version of django, but that gave an error. The pythons that are available to me are:\n-3.7-64        C:\\Users\\tom_p\\Anaconda3\\python.exe *\n -3.7-32        C:\\Python37-32\\python.exe","Q_Score":0,"Tags":"python,django,installation","A_Id":54064223,"CreationDate":"2019-01-06T09:31:00.000","Title":"Struggling to Install Pip and Django on Windows 10","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Can someone give a detailed explanation on how to fix the ERROR: no such table: main.auth_user__old\nIt arises in my Django application when I am trying to add data to my registered models.","AnswerCount":10,"Available Count":4,"Score":0.0,"is_accepted":false,"ViewCount":10875,"Q_Id":54070355,"Users Score":0,"Answer":"I know this issue is encountered a long time back I don't want anyone to stuck on it again:\nStep1: The solution is to check the Django version if it is 2.1 then update it to 2.2 or later.\nStep2: After updating to Django==2.2 or later Delete all old migrations from the migrations folder and delete the db.sqlite3 and then run makemigrations and migrations again. It will be resolved.\nGood Luck!","Q_Score":1,"Tags":"python,django,django-models,django-templates,django-views","A_Id":63941686,"CreationDate":"2019-01-07T07:48:00.000","Title":"How to fix-no such table: main.auth_user__old","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Can someone give a detailed explanation on how to fix the ERROR: no such table: main.auth_user__old\nIt arises in my Django application when I am trying to add data to my registered models.","AnswerCount":10,"Available Count":4,"Score":0.0996679946,"is_accepted":false,"ViewCount":10875,"Q_Id":54070355,"Users Score":5,"Answer":"I have solved this issue using below :\n1) Delete the db.sqlit3\n2) app's directory delete everything in pycache\n3) manage.py makemigrations, manage.py migrate, manage.py createsuperuser and then manage.py runserver.","Q_Score":1,"Tags":"python,django,django-models,django-templates,django-views","A_Id":58519187,"CreationDate":"2019-01-07T07:48:00.000","Title":"How to fix-no such table: main.auth_user__old","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Can someone give a detailed explanation on how to fix the ERROR: no such table: main.auth_user__old\nIt arises in my Django application when I am trying to add data to my registered models.","AnswerCount":10,"Available Count":4,"Score":0.0199973338,"is_accepted":false,"ViewCount":10875,"Q_Id":54070355,"Users Score":1,"Answer":"first of all you don't have to change your code, the problem your django version\nI'm pretty sure that you're following mosh's tutorial or something like that,\nto fix this problem follow this steps:\n\nexit the IDE you are using\ndelete db.sqlite from the folder in your computer not inside the IDE\nopen your IDE and upgrade your django version using this command pip install --upgrade django==2.1.5\nrun this command python manage.py makemigrations\nthen run this command python manage.py migrate\nthis will help you Enchallah","Q_Score":1,"Tags":"python,django,django-models,django-templates,django-views","A_Id":66310689,"CreationDate":"2019-01-07T07:48:00.000","Title":"How to fix-no such table: main.auth_user__old","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Can someone give a detailed explanation on how to fix the ERROR: no such table: main.auth_user__old\nIt arises in my Django application when I am trying to add data to my registered models.","AnswerCount":10,"Available Count":4,"Score":0.0798297691,"is_accepted":false,"ViewCount":10875,"Q_Id":54070355,"Users Score":4,"Answer":"If you are using django==2.1 then maybe you getting this error.\nJust start your Django project again bu installing django==2.1.5\nIt will work.","Q_Score":1,"Tags":"python,django,django-models,django-templates,django-views","A_Id":61805084,"CreationDate":"2019-01-07T07:48:00.000","Title":"How to fix-no such table: main.auth_user__old","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am creating a webpage that should redirect its users to a subpage, based on their choices in a form with radio buttons. The radio button input should trigger logic calculations. For example:\nForm with example user input (Yes\/No):\n\n[Question] | [Yes] | [No]\nQuestion1 | ------ | XXX\nQuestion2 | ------ | XXX\nQuestion3 | XXX | ------\n\nLogic:\n\nIf Q1=No, Q2=No and Q3=Yes, then redirect to page W\nIf Q1=Yes, Q2=No and Q3=Yes, then redirect to page X\nIf Q2=Yes, then redirect to page Y\nElse, then redirect to page Z\n\nThe webpage is part of a project created using Django and Python.\nI do not know how to approach this problem, as the form input should be passed to the webserver while maintaining the possibility to perform the logic calculations.\nAlso, I do not want to store the user input to my database. After a user has been redirected to page W, X, Y or Z, no input should be memorized.\nCan you please help me in finding a proper way to post the user form data to the server, perform the logic calculations and using the result to redirect the user to the right page?\nThank you in advance!\n--\nThank you for your reply. I have tried your suggestion, but eventually chose for a workaround where I implemented IF-statements based on the form outcome. The content of the page following on the user input form thus dependent on the answers.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":120,"Q_Id":54075333,"Users Score":0,"Answer":"If by \"subpage\" you mean that you don't want any page reload, i would recommend dealing with this problem using js and not using a classical Form\/Post method.\nIf you want to keep the logic in your views.py, one way you could do this is sending the form using Ajax, and displaying the result in your page.","Q_Score":1,"Tags":"python,django,forms","A_Id":54075727,"CreationDate":"2019-01-07T13:27:00.000","Title":"Django: How to redirect users to pages based on form input?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"guys I am currently working on a project where I have to integrate a web based application with machine learning.\nWhat the web page does is basically ask the user a couple of questions, whatever the user answers is stored in a Hashmap with question id and question answer.\nI have to send this set of answers to a learning algorithm which has been implemented using python.The learning algorithm will return a set of confidence values for the answers and I have to simply display them on the results web-page.\nI am using the Spring frame-work to develop the web-app.\nThanks.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":248,"Q_Id":54084600,"Users Score":0,"Answer":"You can also create a REST API around the python ML code and return a JSON which can then be easily parsed in spring.","Q_Score":0,"Tags":"python,spring","A_Id":54085373,"CreationDate":"2019-01-08T02:46:00.000","Title":"How to access a python script using Spring framework?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to render output from rq immediately after it gets completed.\nCurrently, I am using Job.fetch() to fetch tasks. But I have to repeatedly check after a certain interval for that.\nI am using flask-socketio to render results.\nIs there some way I could fetch results from task as soon as it gets finished?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":88,"Q_Id":54089090,"Users Score":0,"Answer":"The most probable and used way seemingly is calling Job.fetch() itself after a certain intervals repeatedly using flask-socketio.","Q_Score":0,"Tags":"flask-socketio,python-rq","A_Id":54089433,"CreationDate":"2019-01-08T09:46:00.000","Title":"How to fetch output immediately in python-rq?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an automation task that uses pyautogui and python3 to open a pdf and fill it out with predefined fields from JIRA (The pdf is locked down and there is no way to programatically interface with it other than pyautogui.) The script snaps to the top left of a screen where a pdf is opened, clicks in the pdf and then keystrokes are automated from there.\nAll of this works great on a desktop but now its time to put this on a server where it will run and the best option to deploy looks like Docker. Is what I'm suggesting possible or is there another method that will work like a docker-machine or VM ? This is my first deployment and it's small enough to really mess around with all possible options and do some good learning.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1271,"Q_Id":54099863,"Users Score":0,"Answer":"Figured it out! Built a container that uses xvfb and simulates the x11 session. Just need to set DISPLAY variable and create a session.","Q_Score":0,"Tags":"python-3.x,docker,virtual-machine,centos7,pyautogui","A_Id":55330012,"CreationDate":"2019-01-08T21:18:00.000","Title":"is it possible to run pyautogui on centos 7 docker container","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am a Python developer. I wanted to create some online shopping stores which will be fully customized, Database will Mysql, Redis for caching, mail-gun for mailing, AWS hosting and  Theme may be customized. I am confused in both platforms Magento and Shopify. Please Help Which have the best integration with python.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":201,"Q_Id":54103457,"Users Score":0,"Answer":"Yes Rehan is correct to go with the magento framework","Q_Score":0,"Tags":"python,magento,flask,e-commerce,shopify","A_Id":64007871,"CreationDate":"2019-01-09T04:54:00.000","Title":"Magento or Shopify which is best for integration with Python or which provide best APIs for Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a code running in jupyter notebook which continuously prints output in a cell.\nWhen I open the same notebook in a different tab of a browser(possibly a different machine\/browse\/tab) I want the output of cell to appear in the new tab. It seems the output will only show if I refresh the browser. \nIs there any method to make it work this way?\nThanks","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1578,"Q_Id":54104471,"Users Score":0,"Answer":"Outputs do not appear in new tabs. The tab you have opened only responsible for the output of the code. If you want different cells to show your outputs then write code in different cells and run each cell sequentially to get the correct output.","Q_Score":0,"Tags":"python,jupyter-notebook","A_Id":54104538,"CreationDate":"2019-01-09T06:40:00.000","Title":"Jupyter notebook multiple window output","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"My App consists of a notification module. If the notifications are consecutively arrived from a same user, I would like to show \"n notifications from john doe\".\neg:\nThe database rows are as:\n\nid    |   user    |     notif       |\n------------------------------------\n1       john doe     liked your pic \n2       john doe     commented on your pic\n3       james        liked your pic\n4       james        commented on your pic\n5       john doe     pinged you\n6       john doe     showed interest\n7       john doe     is busy\n\nThe above notifications are to be shown as:\n\n2 notifications from john doe\n2 notification from james\n3 notofications from john doe\n\nHow would I count these consecutive rows with same value in a column using django orm?\n\nNotification.objects.all().values('user', 'notif_count').group_consecutive_by('user').as(notif_count=Sum())\n\nSomething like that. Please help.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":247,"Q_Id":54123705,"Users Score":1,"Answer":"Let my model Notification model be:\n\nClass Notification(models.Model):\n    user = models.ForeignKey(\n        settings.AUTH_USER_MODEL,\n        related_name='notifications',\n        on_delete=models.CASCADE)\n    notif = models.CharField(max_length=255)\n    date_created = models.DateTimeField(auto_now_add=True)\n\n\nThe database rows are as:\n\nid    |   user    |     notif       |\n------------------------------------\n1       john doe     liked your pic \n2       john doe     commented on your pic\n3       james        liked your pic\n4       james        commented on your pic\n5       john doe     pinged you\n6       john doe     showed interest\n7       john doe     is busy\n\nBasically, I am trying to join consecutive rows by user\nThe above notifications then are to be shown as:\n\n2 notifications from john doe\n2 notification from james\n3 notofications from john doe\n\ninstead of\n\n5 notifications from john doe\n2 notification from james\n\nor\n\n1 notifications from john doe\n1 notifications from john doe\n1 notification from james\n1 notification from james\n1 notofications from john doe\n1 notofications from john doe\n1 notofications from john doe\n\nIn  order to achieve this, we are looking for a dictionary like:\n\n{\n\"john doe\": [\"notif1\", \"notif2\"],\n\"james\": [\"notif1\", \"notif2\"],\n\"john doe\": [\"notif1\", \"notif2\", \"notif3\"] #duplicate key.\n}\n\nBut, that's not possible as duplicate keys are not allowed. Hence I am going with array of tuples instead.\n\n[\n  ('john doe', ['notif1', 'notif2']),\n  ('james', ['notif1', 'notif2']),\n  ('john doe', ['notif1', 'notif2', 'notif3']),\n]\n\nSo, we first sort the Notifications by date_created. Then we use itertools.groupby to make groups per user.\n\nfrom itertools import groupby\nfrom operator import attrgetter\n\nqs = Notification.objects.select_related('user').order_by('date_created')\nnotifs= [(u, list(nf)) for (u, nf) in groupby(qs, attrgetter('user'))]\n\nYou have everything sorted as needed in notifs.\nDone!","Q_Score":0,"Tags":"python,django,django-models,django-views","A_Id":54140405,"CreationDate":"2019-01-10T07:25:00.000","Title":"Count consecutive rows with same value for a column in a database using django?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm coming to you with the following issue:\nI have a bunch of physical boxes onto which I still stick QR codes generated using a python module named qrcode. In a nutshell, what I would like to do is everytime someone wants to take the object contained in a box, he scans the qr code with his phone, then takes it and put it back when he is done, not forgetting to scan the QR code again.\nPretty simple, isn't it?\nI already have a django table containing all my objects.\nNow my question is related to the design. I suspect the easiest way to achieve that is to have a POST request link in the QR code which will create a new entry in a table with the name of the object that has been picked or put back, the time (I would like to store this information).\nIf that's the correct way to do, how would you approach it? I'm not too sure I see how to make a POST request with a QR code. Would you have any idea?\nThanks.\nPS: Another alternative I can think of would be to a link in the QR code to a form with a dummy button the user would click on. Once clicked the button would update the database. But I would fine a solution without any button more convenient...","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":4065,"Q_Id":54135030,"Users Score":3,"Answer":"The question boils down to a few choices: (a) what data do you want to encode into the QR code; (b) what app will you use to scan the QR code; and (c) how do you want the app to use \/ respond to the encoded data.\nIf you want your users to use off-the-shelf QR code readers (like free smartphone apps), then encoding a full URL to the appropriate API on your backend makes sense. Whether this should be a GET or POST depends on the QR code reader.  I'd expect most to use GET, but you should verify that for your choice of app. That should be functionally fine, if you don't have any concerns about who should be able to scan the code.\nIf you want more control, e.g. you'd like to keep track of who scanned the code or other info not available to the server side just from a static URL request, you need a different approach. Something like, store the item ID (not URL) in the QR code; create your own simple QR code scanner app (many good examples exist) and add a little extra logic to that client, like requiring the user to log in with an ID + password, and build the URL dynamically from the item ID and the user ID.  Many security variations possible (like JWT token) -- how you do that won't be dictated by the contents of the QR code. You could do a lot of other things in that QR code scanner \/ client, like add GPS location, ask the user to indicate why or where they're taking the item, etc.  \nSo you can choose between a simple way with no controls, and a more complex way that would allow you to layer in whatever other controls and extra data you need.","Q_Score":0,"Tags":"python,django,qr-code","A_Id":54136664,"CreationDate":"2019-01-10T18:42:00.000","Title":"Interfacing a QR code recognition to a django database","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have apps deployed in AWS, like elastic search and ec2 instances inside VPC. Is there any service I can use to lookup the type of service running on the IP address from my VPC log. All my components are inside VPC I have the vpc log to get the ip address , Mostly it's all private ipv4 addresses.\nAny API in python or Java will be helpful.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":1384,"Q_Id":54140167,"Users Score":1,"Answer":"There is no service to identify the service. However you can get an idea on what that IP is associated with via aws ec2 describe-network-interfaces","Q_Score":1,"Tags":"java,python,amazon-web-services,amazon-ec2,vpc","A_Id":54144184,"CreationDate":"2019-01-11T03:52:00.000","Title":"How to identify AWS component by IP address lookup?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We are using JFrog Artifactory and we keep jar files and tar.gz files into Artifactory. \nWhen we upload a jar file, in Artifactory we are able to expand and see the jar file contents like com -> mycomp -> app ....\nWhen we upload a tar.gz file which contains jar file, we are able to expand the tar.gz file contents but we are not able to expand the jar file.\nWe are using Python to create tar.gz file.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1165,"Q_Id":54140169,"Users Score":1,"Answer":"this is actually by design of Artifactory. When you're uploading artifacts to Artifactory it will unpack it so you can browse the contents from the repository browser (as you indeed mentioned). \nWhen you're uploading a compressed archive (whether that is a zip or tar.gz or something else), Artifactory doesn't extract the subcomponents. The reason behind that is that zips (or any other archive) could contain many more subcomponents and those could contain many more subcomponents too (and so on). That would place a heavy burden on the Artifactory server by consuming, potentially, tons of resources.","Q_Score":0,"Tags":"python,artifactory","A_Id":54150531,"CreationDate":"2019-01-11T03:52:00.000","Title":"Uploading artifacts to JFrog Artifactory","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm getting this error from trying to create a superuser for my Django project. Unsure what table requires a default value for its 'name' column.\nAfter successfully creating migrations for my Django project I ran python manage.py createsuperuser to create the superuser and got the following error:\ndjango.db.utils.IntegrityError: (1364, \"Field 'name' doesn't have a default value\"). I installed mysql (8.0) am using homebrew on OSX and using python 3 in a virtual env.\nI'm not sure which database the above command tries to engage, talk less of which table. In any case I have gone through all tables in the db relevant to my project as well as in the mysql database and have run this command on the only name column found:\nALTER TABLE django_migrations ALTER COLUMN name SET DEFAULT '-'\nBut I am still getting this error. I have read up on createsuperuser in the Django docs as well as looked into some of the Django code but have gleaned very little of value to solving this. Any help with this would be greatly appreciated.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2779,"Q_Id":54149866,"Users Score":0,"Answer":"By default Django has a table called auth_user serving the user authentication which doesn't contain a field called name, so my assumption is that you have a custom AUTH_USER_MODEL defined in your settings.py which contains a field called name with not set default value.","Q_Score":3,"Tags":"mysql,django,python-3.x","A_Id":54149997,"CreationDate":"2019-01-11T15:52:00.000","Title":"How to resolve django.db.utils.IntegrityError: (1364, \"Field 'name' doesn't have a default value\")","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In my logs. I'm getting a large number of connections from a local IP address (which changes every time I restart my application. Is this anything to worry about or should I just block internal IPs from making requests to my server","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":63,"Q_Id":54152468,"Users Score":0,"Answer":"Turns out it's because Heroku uses an internal routing system meaning that connections appear to the server as if they had originated from an internal, private ip address","Q_Score":0,"Tags":"python,heroku,server,twisted","A_Id":54154957,"CreationDate":"2019-01-11T18:56:00.000","Title":"Heroku - Private IP address making requests to server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"For some reason I cannot run \"manage.py test AppNameHere\" on my Windows machine but when I run it on a linux machine (I'm not sure if the OS actually matters here) the tests run fine. I am getting this error:\n\n2019-01-11 17:35:32 [DEBUG] faker.factory: Not in REPL -> leaving logger event level as is.\nCreating test database for alias 'default'...\nTraceback (most recent call last):\n  File \"manage.py\", line 22, in \n    execute_from_command_line(sys.argv)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management\\__init__.py\", line 381, in execute_from_command_line\n    utility.execute()\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management\\__init__.py\", line 375, in execute\n    self.fetch_command(subcommand).run_from_argv(self.argv)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management\\commands\\test.py\", line 26, in run_from_argv\n    super().run_from_argv(argv)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management\\base.py\", line 316, in run_from_argv\n    self.execute(*args, **cmd_options)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management\\base.py\", line 353, in execute\n    output = self.handle(*args, **options)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management\\commands\\test.py\", line 56, in handle\n    failures = test_runner.run_tests(test_labels)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\test\\runner.py\", line 604, in run_tests\n    old_config = self.setup_databases()\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\test\\runner.py\", line 551, in setup_databases\n    self.parallel, **kwargs\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\test\\utils.py\", line 174, in setup_databases\n    serialize=connection.settings_dict.get('TEST', {}).get('SERIALIZE', True),\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\backends\\base\\creation.py\", line 68, in create_test_db\n    run_syncdb=True,\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management\\__init__.py\", line 148, in call_command\n    return command.execute(*args, **defaults)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management\\base.py\", line 353, in execute\n    output = self.handle(*args, **options)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management\\base.py\", line 83, in wrapped\n    res = handle_func(*args, **kwargs)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management\\commands\\migrate.py\", line 203, in handle\n    fake_initial=fake_initial,\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\migrations\\executor.py\", line 117, in migrate\n    state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\migrations\\executor.py\", line 147, in _migrate_all_forwards\n    state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\migrations\\executor.py\", line 244, in apply_migration\n    state = migration.apply(state, schema_editor)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\migrations\\migration.py\", line 124, in apply\n    operation.database_forwards(self.app_label, schema_editor, old_state, project_state)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\migrations\\operations\\fields.py\", line 84, in database_forwards\n    field,\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\backends\\sqlite3\\schema.py\", line 309, in add_field\n    self._remake_table(model, create_field=field)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\backends\\sqlite3\\schema.py\", line 181, in _remake_table\n    self.effective_default(create_field)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\backends\\base\\schema.py\", line 218, in effective_default\n    default = field.get_default()\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\models\\fields\\related.py\", line 927, in get_default\n    if isinstance(field_default, self.remote_field.model):\nTypeError: isinstance() arg 2 must be a type or tuple of types\nThis looks like something is wrong with Django but I'm not sure. Does anyone have any insights on this? I don't want to go in modifying any of these files from the trace since they are a part of Django.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":622,"Q_Id":54156147,"Users Score":0,"Answer":"what about changing the code\nFile \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\models\\fields\\related.py\", line 927, in get_default\nif isinstance(field_default, type(self.remote_field.model)):","Q_Score":2,"Tags":"django,python-3.x","A_Id":55450690,"CreationDate":"2019-01-12T01:54:00.000","Title":"Django Unittest failing to run with TypeError: isinstance() arg 2 must be a type or tuple of types on one machine but not others","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"For some reason I cannot run \"manage.py test AppNameHere\" on my Windows machine but when I run it on a linux machine (I'm not sure if the OS actually matters here) the tests run fine. I am getting this error:\n\n2019-01-11 17:35:32 [DEBUG] faker.factory: Not in REPL -> leaving logger event level as is.\nCreating test database for alias 'default'...\nTraceback (most recent call last):\n  File \"manage.py\", line 22, in \n    execute_from_command_line(sys.argv)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management\\__init__.py\", line 381, in execute_from_command_line\n    utility.execute()\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management\\__init__.py\", line 375, in execute\n    self.fetch_command(subcommand).run_from_argv(self.argv)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management\\commands\\test.py\", line 26, in run_from_argv\n    super().run_from_argv(argv)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management\\base.py\", line 316, in run_from_argv\n    self.execute(*args, **cmd_options)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management\\base.py\", line 353, in execute\n    output = self.handle(*args, **options)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management\\commands\\test.py\", line 56, in handle\n    failures = test_runner.run_tests(test_labels)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\test\\runner.py\", line 604, in run_tests\n    old_config = self.setup_databases()\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\test\\runner.py\", line 551, in setup_databases\n    self.parallel, **kwargs\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\test\\utils.py\", line 174, in setup_databases\n    serialize=connection.settings_dict.get('TEST', {}).get('SERIALIZE', True),\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\backends\\base\\creation.py\", line 68, in create_test_db\n    run_syncdb=True,\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management\\__init__.py\", line 148, in call_command\n    return command.execute(*args, **defaults)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management\\base.py\", line 353, in execute\n    output = self.handle(*args, **options)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management\\base.py\", line 83, in wrapped\n    res = handle_func(*args, **kwargs)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management\\commands\\migrate.py\", line 203, in handle\n    fake_initial=fake_initial,\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\migrations\\executor.py\", line 117, in migrate\n    state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\migrations\\executor.py\", line 147, in _migrate_all_forwards\n    state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\migrations\\executor.py\", line 244, in apply_migration\n    state = migration.apply(state, schema_editor)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\migrations\\migration.py\", line 124, in apply\n    operation.database_forwards(self.app_label, schema_editor, old_state, project_state)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\migrations\\operations\\fields.py\", line 84, in database_forwards\n    field,\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\backends\\sqlite3\\schema.py\", line 309, in add_field\n    self._remake_table(model, create_field=field)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\backends\\sqlite3\\schema.py\", line 181, in _remake_table\n    self.effective_default(create_field)\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\backends\\base\\schema.py\", line 218, in effective_default\n    default = field.get_default()\n  File \"C:\\Users\\personA\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\models\\fields\\related.py\", line 927, in get_default\n    if isinstance(field_default, self.remote_field.model):\nTypeError: isinstance() arg 2 must be a type or tuple of types\nThis looks like something is wrong with Django but I'm not sure. Does anyone have any insights on this? I don't want to go in modifying any of these files from the trace since they are a part of Django.","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":622,"Q_Id":54156147,"Users Score":1,"Answer":"I solved this by:\n\ndeleting all my migration files\nremoving the entries in the django_migrations table\nremade migrations (makemigrations)\ndid a migrate --fake","Q_Score":2,"Tags":"django,python-3.x","A_Id":61032897,"CreationDate":"2019-01-12T01:54:00.000","Title":"Django Unittest failing to run with TypeError: isinstance() arg 2 must be a type or tuple of types on one machine but not others","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Using PyCharm and following a step-by-step guide for setting up a cookiecutter Django project. Can't seem to get past the migrate command. \nThis is my first time using the cookiecutter project template and I haven't had issues before when creating projects from scratch. Not sure what the issue is but it looks like it may be related to the INSTALLED_APPS, but I haven't modified any of the files from the template.\nError is listed below:\n\n\"C:\\Program Files\\JetBrains\\PyCharm 2018.3\\bin\\runnerw64.exe\"\n  C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\python.exe\n  \"C:\\Program Files\\JetBrains\\PyCharm\n  2018.3\\helpers\\pycharm\\django_manage.py\" migrate C:\/Users\/willi\/PycharmProjects\/fishgutz Tracking file by folder\n  pattern:  migrations Traceback (most recent call last):   File\n  \"C:\\Program Files\\JetBrains\\PyCharm\n  2018.3\\helpers\\pycharm\\django_manage.py\", line 52, in \n      run_command()   File \"C:\\Program Files\\JetBrains\\PyCharm 2018.3\\helpers\\pycharm\\django_manage.py\", line 46, in run_command\n      run_module(manage_file, None, 'main', True)   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\runpy.py\",\n  line 205, in run_module\n      return _run_module_code(code, init_globals, run_name, mod_spec)   File\n  \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\runpy.py\",\n  line 96, in _run_module_code\n      mod_name, mod_spec, pkg_name, script_name)   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\runpy.py\",\n  line 85, in _run_code\n      exec(code, run_globals)   File \"C:\/Users\/willi\/PycharmProjects\/fishgutz\\manage.py\", line 30, in\n  \n      execute_from_command_line(sys.argv)   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management__init__.py\",\n  line 371, in execute_from_command_line\n      utility.execute()   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management__init__.py\",\n  line 365, in execute\n      self.fetch_command(subcommand).run_from_argv(self.argv)   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management__init__.py\",\n  line 216, in fetch_command\n      klass = load_command_class(app_name, subcommand)   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management__init__.py\",\n  line 36, in load_command_class\n      module = import_module('%s.management.commands.%s' % (app_name, name))   File\n  \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\importlib__init__.py\",\n  line 126, in import_module\n      return _bootstrap._gcd_import(name[level:], package, level)   File \"\", line 994, in _gcd_import   File\n  \"\", line 971, in _find_and_load   File\n  \"\", line 955, in _find_and_load_unlocked \n  File \"\", line 665, in _load_unlocked\n  File \"\", line 678, in\n  exec_module   File \"\", line 219, in\n  _call_with_frames_removed   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management\\commands\\migrate.py\",\n  line 12, in \n      from django.db.migrations.autodetector import MigrationAutodetector   File\n  \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\migrations\\autodetector.py\",\n  line 11, in \n      from django.db.migrations.questioner import MigrationQuestioner   File\n  \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\migrations\\questioner.py\",\n  line 9, in \n      from .loader import MigrationLoader   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\migrations\\loader.py\",\n  line 8, in \n      from django.db.migrations.recorder import MigrationRecorder   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\migrations\\recorder.py\",\n  line 9, in \n      class MigrationRecorder:   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\migrations\\recorder.py\",\n  line 22, in MigrationRecorder\n      class Migration(models.Model):   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\models\\base.py\",\n  line 100, in new\n      app_config = apps.get_containing_app_config(module)   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\apps\\registry.py\",\n  line 244, in get_containing_app_config\n      self.check_apps_ready()   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\apps\\registry.py\",\n  line 127, in check_apps_ready\n      raise AppRegistryNotReady(\"Apps aren't loaded yet.\") django.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet.\nProcess finished with exit code 1\nExpected: postgres database configures and I can then runserver","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":215,"Q_Id":54173128,"Users Score":0,"Answer":"Are you using separated settings module? If you are, you must export DJANGO_SETTINGS_MODULE=<your_settings_module>\nFor example, when your settings separated byprod\/settings\/local.py and prod\/settings\/deploy.py\nexport DJANGO_SETTINGS_MODULE=prod.settings.local\nor \nexport DJANGO_SETTINGS_MODULE=prod.settings.deploy","Q_Score":0,"Tags":"python,django,django-migrations","A_Id":54174783,"CreationDate":"2019-01-13T20:55:00.000","Title":"Django first migration issue","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Using PyCharm and following a step-by-step guide for setting up a cookiecutter Django project. Can't seem to get past the migrate command. \nThis is my first time using the cookiecutter project template and I haven't had issues before when creating projects from scratch. Not sure what the issue is but it looks like it may be related to the INSTALLED_APPS, but I haven't modified any of the files from the template.\nError is listed below:\n\n\"C:\\Program Files\\JetBrains\\PyCharm 2018.3\\bin\\runnerw64.exe\"\n  C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\python.exe\n  \"C:\\Program Files\\JetBrains\\PyCharm\n  2018.3\\helpers\\pycharm\\django_manage.py\" migrate C:\/Users\/willi\/PycharmProjects\/fishgutz Tracking file by folder\n  pattern:  migrations Traceback (most recent call last):   File\n  \"C:\\Program Files\\JetBrains\\PyCharm\n  2018.3\\helpers\\pycharm\\django_manage.py\", line 52, in \n      run_command()   File \"C:\\Program Files\\JetBrains\\PyCharm 2018.3\\helpers\\pycharm\\django_manage.py\", line 46, in run_command\n      run_module(manage_file, None, 'main', True)   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\runpy.py\",\n  line 205, in run_module\n      return _run_module_code(code, init_globals, run_name, mod_spec)   File\n  \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\runpy.py\",\n  line 96, in _run_module_code\n      mod_name, mod_spec, pkg_name, script_name)   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\runpy.py\",\n  line 85, in _run_code\n      exec(code, run_globals)   File \"C:\/Users\/willi\/PycharmProjects\/fishgutz\\manage.py\", line 30, in\n  \n      execute_from_command_line(sys.argv)   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management__init__.py\",\n  line 371, in execute_from_command_line\n      utility.execute()   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management__init__.py\",\n  line 365, in execute\n      self.fetch_command(subcommand).run_from_argv(self.argv)   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management__init__.py\",\n  line 216, in fetch_command\n      klass = load_command_class(app_name, subcommand)   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management__init__.py\",\n  line 36, in load_command_class\n      module = import_module('%s.management.commands.%s' % (app_name, name))   File\n  \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\importlib__init__.py\",\n  line 126, in import_module\n      return _bootstrap._gcd_import(name[level:], package, level)   File \"\", line 994, in _gcd_import   File\n  \"\", line 971, in _find_and_load   File\n  \"\", line 955, in _find_and_load_unlocked \n  File \"\", line 665, in _load_unlocked\n  File \"\", line 678, in\n  exec_module   File \"\", line 219, in\n  _call_with_frames_removed   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\core\\management\\commands\\migrate.py\",\n  line 12, in \n      from django.db.migrations.autodetector import MigrationAutodetector   File\n  \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\migrations\\autodetector.py\",\n  line 11, in \n      from django.db.migrations.questioner import MigrationQuestioner   File\n  \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\migrations\\questioner.py\",\n  line 9, in \n      from .loader import MigrationLoader   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\migrations\\loader.py\",\n  line 8, in \n      from django.db.migrations.recorder import MigrationRecorder   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\migrations\\recorder.py\",\n  line 9, in \n      class MigrationRecorder:   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\migrations\\recorder.py\",\n  line 22, in MigrationRecorder\n      class Migration(models.Model):   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\db\\models\\base.py\",\n  line 100, in new\n      app_config = apps.get_containing_app_config(module)   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\apps\\registry.py\",\n  line 244, in get_containing_app_config\n      self.check_apps_ready()   File \"C:\\Users\\willi\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\django\\apps\\registry.py\",\n  line 127, in check_apps_ready\n      raise AppRegistryNotReady(\"Apps aren't loaded yet.\") django.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet.\nProcess finished with exit code 1\nExpected: postgres database configures and I can then runserver","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":215,"Q_Id":54173128,"Users Score":0,"Answer":"I redid the process but chose NOT to include Celery and the migration and server ran successfully. I believe that app was not set up in entirety and was throwing off the project. To avoid continued headache, I chose to exclude it for now in the new setup. Thank you for the help @Yongjin Jo!","Q_Score":0,"Tags":"python,django,django-migrations","A_Id":54189972,"CreationDate":"2019-01-13T20:55:00.000","Title":"Django first migration issue","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am logging to a website with valid credentials, but if my network changes or even device gets changed (within same network); it redirects to Authentication page where I have to put the access code, which I received via email. I want to skip this authentication page and navigate to other pages to continue my process. \nExpected result - Home page of the site\nActual result - Secure Access Code page","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":1260,"Q_Id":54180659,"Users Score":1,"Answer":"When you initialise your driver you can  configure the browser to load your chrome profile, that is if your using chrome. This may allow you to bypass the authentication page if you have had a previous login with this profile. Not sure if this will work but it worth a shot.","Q_Score":0,"Tags":"python,selenium-webdriver","A_Id":54180917,"CreationDate":"2019-01-14T11:29:00.000","Title":"2 factor authentication handling in selenium webdriver with python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a web-socket client which sends audio binary data in the request and receive them as a response from the web-socket server. I am using pyaudio to read binary audio data from (file\/microphone) which I then sending to the server. Then  as the response I receive another binary audio data from the server. The question is can I use my recently opened pyaudio reading stream to play receiving audio in real time or I better need to create another pyaudio stream (Have two streams where one is responsible for binary data reading and another for binary data writing)?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1404,"Q_Id":54183268,"Users Score":1,"Answer":"be aware of the fact, that, as far as I know, reading stream data is kind of generator process. Once you read it, you lose the data - In other words: based on your chunk, you basicly by every 'read' move a pointer that grabs your binary data.\nAnswer\nWhy dont you create 2 threads with 2 streams? Dont be afraid of streams. You can initialize as many as you want.\n\n1 thread receives binary data and push them into stream(from client to your sound device)\n2 thread receive data from your input stream (in binary form from your mic) and you push them to your client?\n\nI am working now little bit with PyAudio and streaming is quite interesting but hard to understand from programming point of view. You can actually create 2 output streams into your headphones and somewhere in a hardware on the way to your headphones the streams sum up themselves so you can simply listen two sounds in the same time. \nNOTE:\nAlso I wanted to say that you dont have to be worry about using threads. The streams works in batch, not in realtime. Whether it is read or write, it works in the way, that you have binary data which you push in a stream and you are done. Hardware accepts the binary data, stream them and only after it finishes, then the stream asks for another data. So if you have sample_rate 44100 and chunk 22050(just example), your loop will be just 0.5s. So you dont have to be even worry about overflows, too much data to handle or your threads getting crazy. \nIn fact, the moment you push data to stream, your python waits for your hardware to finish the job. Its very leightweight.","Q_Score":1,"Tags":"python,audio,audio-streaming,pyaudio","A_Id":54183504,"CreationDate":"2019-01-14T14:20:00.000","Title":"Using one pyaudio stream for both data reading and writing","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Ok here's my basic information before I go on:\nMacBook Pro: OS X 10.14.2\nPython Version: 3.6.7\nJava JDK: V8.u201\nI'm trying to install the Apache Spark Python API (PySpark) on my computer. I did a conda installation: conda install -c conda-forge pyspark\nIt appeared that the module itself was properly downloaded because I can import it and call methods from it. However, opening the interactive shell with myuser$ pyspark gives the error: \nNo Java runtime present, requesting install.\nOk that's fine. I went to Java's download page to get the current JDK, in order to have it run, and downloaded it on Safari. Chrome apparently doesn't support certain plugins for it to work (although initially I did try to install it with Chrome). Still didn't work.\nOk, I just decided to start trying to use it.\nfrom pyspark.sql import SparkSession It seemed to import the module correctly because it was auto recognizing SparkSession's methods. However,\nspark = SparkSession.builder.getOrCreate() gave the error:\nException: Java gateway process exited before sending its port number\nReinstalling the JDK doesn't seem to fix the issue, and now I'm stuck with a module that doesn't seem to work because of an issue with Java that I'm not seeing. Any ideas of how to fix this problem? Any and all help is appreciated.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":244,"Q_Id":54206569,"Users Score":0,"Answer":"This problem is coming with spark 2.4. please try spark 2.3.","Q_Score":0,"Tags":"java,python,apache-spark,java-8,pyspark","A_Id":54281008,"CreationDate":"2019-01-15T20:47:00.000","Title":"Tried importing Java 8 JDK for PySpark, but PySpark still won't let me start a session","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to add a vertex to JanusGraph by GremlinPython, and I already set graph.set-vertex-id=true in config, but I always get error:GremlinServerError: 500: Not a valid vertex id: 5678\nI want to set a custom id to vertex, I only know the id should be a long type, some id set success, like:2048, 123456...; But more id set failed, it raise a error: GremlinServerError: 500: Not a valid vertex id: 5678. \nMy add vertex code is:\nvip = g.addV().property(T.id, 5678).property(\"name\", \"domain\").property(\"value\", \"www.google.com\").next()\n\nPlease tell me what is a valid id?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":950,"Q_Id":54219472,"Users Score":0,"Answer":"The type is Long, but you need to send it in a string.\n\nvip = g.addV().property(T.id, '5678').property(\"name\", \"domain\").....","Q_Score":3,"Tags":"python,gremlin,janusgraph","A_Id":72497919,"CreationDate":"2019-01-16T14:41:00.000","Title":"gremlin-python: what is a valid vertex custom id?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We are developing an deep learning application on AWS. The automation of model training is quite challenging. The first step is to prepare the data for training which involves generating a huge 3D  numpy array (> 100GB) from hundreds of thousands of small 2D numpy arrays. The small numpy arrays are saved in S3 bucket as small files. After the conversion, the big numpy array will saved to another S3 bucket. The training script will pick up the big 3D numpy array before the training. Since lambda function has a memory limit so we will have to launch an EC2 instance manually. \nI wonder what is the best practice to launch a EC2 instance from external and run the python script on the instance to do the data loading and transformation? \nThe whole workflow will probably be automated using AWS step function.","AnswerCount":3,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":158,"Q_Id":54260826,"Users Score":0,"Answer":"You can use a Configuration set in a Cloud formation template to define steps where you can perform copies or run scripts or commands upon start up of your EC2 resource. You can even run it transiently so that it shut itself down after all operations are completed.\nYou can then use a script or Lambda function to execute the Cloudformation Stack","Q_Score":1,"Tags":"python,amazon-web-services,numpy,amazon-s3","A_Id":54261008,"CreationDate":"2019-01-18T20:13:00.000","Title":"How to launch a EC2 instance and run a task on-demand","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We are developing an deep learning application on AWS. The automation of model training is quite challenging. The first step is to prepare the data for training which involves generating a huge 3D  numpy array (> 100GB) from hundreds of thousands of small 2D numpy arrays. The small numpy arrays are saved in S3 bucket as small files. After the conversion, the big numpy array will saved to another S3 bucket. The training script will pick up the big 3D numpy array before the training. Since lambda function has a memory limit so we will have to launch an EC2 instance manually. \nI wonder what is the best practice to launch a EC2 instance from external and run the python script on the instance to do the data loading and transformation? \nThe whole workflow will probably be automated using AWS step function.","AnswerCount":3,"Available Count":3,"Score":1.2,"is_accepted":true,"ViewCount":158,"Q_Id":54260826,"Users Score":1,"Answer":"I would go with the most simple solution as this is not that complicated task (from the architectural perspective).\nConfigure S3 event for a bucket, the one where you are storing the new big 3D array, to trigger lambda function once the object has been put into the bucket (you can be more granular and trigger it based on prefix if you are storing all\/different data in the same bucket).\nInside of that lambda function, you simply launch new EC2 instance and pass user data script to it that will download necessary files and run the task (this can be done using boto3 for Python).\nUsing CloudFormation in this case would be overkill (my opinion).","Q_Score":1,"Tags":"python,amazon-web-services,numpy,amazon-s3","A_Id":54265569,"CreationDate":"2019-01-18T20:13:00.000","Title":"How to launch a EC2 instance and run a task on-demand","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We are developing an deep learning application on AWS. The automation of model training is quite challenging. The first step is to prepare the data for training which involves generating a huge 3D  numpy array (> 100GB) from hundreds of thousands of small 2D numpy arrays. The small numpy arrays are saved in S3 bucket as small files. After the conversion, the big numpy array will saved to another S3 bucket. The training script will pick up the big 3D numpy array before the training. Since lambda function has a memory limit so we will have to launch an EC2 instance manually. \nI wonder what is the best practice to launch a EC2 instance from external and run the python script on the instance to do the data loading and transformation? \nThe whole workflow will probably be automated using AWS step function.","AnswerCount":3,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":158,"Q_Id":54260826,"Users Score":0,"Answer":"did you consider using Amazon SageMaker? It's easy to configure repeatable training jobs. I'd love to hear your feedback and answer any questions.","Q_Score":1,"Tags":"python,amazon-web-services,numpy,amazon-s3","A_Id":54268333,"CreationDate":"2019-01-18T20:13:00.000","Title":"How to launch a EC2 instance and run a task on-demand","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created and worked on a Django application (Simple website with user registration and login) without ever closing the virtualenv i was working on.\nNow that some time went through I can't remember the name of the virtualenv I was working on and so I can't activate it. How can I find the name of the virtualenv?\nThe name of the directory of my django app is \"uniweb\" and is on the desktop of my computer. I haven't yet put it on Github.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":757,"Q_Id":54274894,"Users Score":0,"Answer":"though this problem can be solved by making another environment and importing project there. it can also be solved \nhere is how i solved the same problem.\nif you got the same name. it is just simple as you have to use workon on command promt inside the directory you have created the django project and it shows the list of all virtual environments you have created there, so you can remember the name and use your virtual environment","Q_Score":0,"Tags":"python,django,virtualenv","A_Id":59459193,"CreationDate":"2019-01-20T08:52:00.000","Title":"Django virtualenv name forgotten","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"This has been asked several ways. No helpful answers found. I'm running Windows, but final build will run on Linux. \nI am creating an RFID reader gate system. I have 2 separate python programs.\nProgram 1 constantly monitors the reader which is connected via serial port (COM27). When the reader reads a badge, looks in database for user, gate opens, records data, closes.\nProgram 2 adds new people to a database. It only reads from the serial port when a new card is being added. (need to scan the card to get the number) for database) \nObviously, program 2 tries to open serial port and fails. Program 1 already has it open.\nI've tried creating a program 3 which handles serial communication, but importing it into the other 2 programs creates separate instances, so same issue. \nHow can I create one instance of the program and have it send the read info to both programs?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":302,"Q_Id":54285516,"Users Score":0,"Answer":"the situation is very strange, but, I think, maybe you can't change your software architecture.\nThe only way that I think could resolve your program is to write a daemon that grabs the serial port and offer 2 files or 2 sockets or something else for each python instance.\nI could do it using c++ but it is not mandatory.","Q_Score":0,"Tags":"linux,python-3.x,windows,serial-port","A_Id":54287126,"CreationDate":"2019-01-21T07:55:00.000","Title":"Reading One Serial Port from With Two Programs : Python 3","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've installed NGINX, GUNICORN and my project properly on Ubuntu server, \nbut when I run the project using\npython manage.py runserver, I get the following error; \n\ndjango.db.utils.OperationalError: (2003, \"Can't connect to MySQL server on '127.0.0.1' (111)\"\n\nBefore, installing gunicorn, my site was running properly at my_public_ip_address:8000","AnswerCount":3,"Available Count":2,"Score":0.0665680765,"is_accepted":false,"ViewCount":7818,"Q_Id":54312110,"Users Score":1,"Answer":"as asked before if you are running your website on a remote server, you should make sure that you add the ip address to the ALLOWED_HOSTS-list otherwise you might get another error. \nSolutions could be:\n\nDid you try to uninstall gunicorn? gunicorn is used later for the deployment of the website so it should actually be fine, as you are starting a development server with python manage.py runserver\nAs nginx is also used to ship your website into production if would assume that this should note be related directly to the database. you might want to check if nginx is running with service nginx status if this allocates the localhost port django can maybe not access the mysql database\nDid you check the port config of your mysql database?","Q_Score":1,"Tags":"python,mysql,django","A_Id":54312442,"CreationDate":"2019-01-22T16:02:00.000","Title":"django.db.utils.OperationalError: (2003, \"Can't connect to MySQL server on '127.0.0.1' (111)\"","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've installed NGINX, GUNICORN and my project properly on Ubuntu server, \nbut when I run the project using\npython manage.py runserver, I get the following error; \n\ndjango.db.utils.OperationalError: (2003, \"Can't connect to MySQL server on '127.0.0.1' (111)\"\n\nBefore, installing gunicorn, my site was running properly at my_public_ip_address:8000","AnswerCount":3,"Available Count":2,"Score":0.1325487884,"is_accepted":false,"ViewCount":7818,"Q_Id":54312110,"Users Score":2,"Answer":"check your mysql server is running or not\nrestart the mysql server","Q_Score":1,"Tags":"python,mysql,django","A_Id":63745689,"CreationDate":"2019-01-22T16:02:00.000","Title":"django.db.utils.OperationalError: (2003, \"Can't connect to MySQL server on '127.0.0.1' (111)\"","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an running with serverless framework and python. I implemented a authentication function and registered it in the serverless.yaml. For testing, I just configured for one lambda function to be called after the authentication function. The authentication function gets called without any error, but the lambda function resolves in a 500 Internal Server Error\nI tried the serverless docs, but a lot of examples regarding my issue are not written in python, so its not helping me\nexpected result: no error when calling lambda function\noutput: 500 Internal Server Error","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":64,"Q_Id":54312422,"Users Score":0,"Answer":"Sorry for not providing any code, but I actually found the solution. I did not generate any policy for the api gateway :D","Q_Score":0,"Tags":"python,amazon-web-services,serverless","A_Id":54401828,"CreationDate":"2019-01-22T16:21:00.000","Title":"Python: Serverless Authentication working, but lambda not getting invoked","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have some Python image processing code that uses Keras and TensorFlow Libs, which is needed to be converted to Java Framework.\nMy main problems are:\na. TensorFlow for java is not stable yet, so I have to find another  equivalent Java Lib.\nb. I haven't found Java image processing library that covers the Keras image processing functions and utility (e.g. the class \"ImageDataGenerator\")\nc. The program intends to be cross-platform for dummies (biologists....) so it shall not use any native parts that may cause realtime compiling problems for the clients, means it needs to be written in pure Java.\nThanks!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":63,"Q_Id":54324148,"Users Score":0,"Answer":"Tensorflow themselves say: \n\nCaution: The TensorFlow Java API is not covered by the TensorFlow API\n  stability guarantees.\n\nThis however doesn't mean that your application will not be stable. The key take-away here is that whatever you will build is not guaranteed to work out of the box when new versions are released. However, if you pin down the version of the Tensorflow API that you use, you should be alright.","Q_Score":1,"Tags":"java,python,tensorflow,image-processing,keras","A_Id":54324410,"CreationDate":"2019-01-23T09:38:00.000","Title":"Python to java image proccesing translation","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an old project running (Django 1.6.5, Python 2.7) live for several years. I have to make some changes and have set up a working development environment with all the right django and python requirements (packages, versions, etc.)\nEverything is running fine, except when I am trying to make changes inside the admin panel. I can log on fine and looking at the database (sqlite3) I see my user has superuser privileges. However django says \"You have no permissions to change anything\" and thus not even displaying any of the models registered for the admin interface.\nI am using the same database that is running on the live server. There I have no issues at all (Live server also running in development mode with DEBUG=True has no issues) -> I can only see the history (My Change Log) - Nothing else\nI have also created a new superuser - but same problem here.\nI'd appreciate any pointers (Maybe how to debug this?)","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":84,"Q_Id":54345919,"Users Score":0,"Answer":"Finally, I found the issue:\nadmin.autodiscover()\nwas commented out in the project's urls.py for some reason. (I may have done that trying to get the project to work in a more recent version of django) - So admin.site.register was never called and the app_dict never filled. index.html template of django.contrib.admin then returns \n\nYou don't have permission to edit anything.\n\nor it's equivalent translation (which I find confusing, given that the permissions are correct, only no models were added to the admin dictionary.\nI hope this may help anyone running into a similar problem","Q_Score":0,"Tags":"python,django,database,admin,privileges","A_Id":54363022,"CreationDate":"2019-01-24T11:46:00.000","Title":"Django Admin Interface - Privileges On Development Server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm writing a utility to start up a django server process that outputs its logs to a TextCtrl in a wxpython window. Unfortunately, a couple different approaches have led to weird issues where the operating system (OSX in this case) crashing the program with complaints about \"Illegal Instruction\" after a few successful log entries.\nI'm currently doing this by implementing a logging.Handler subclass that posts events to wx that contain the logging records to be shown in the window. Is there a better approach?\nThanks!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":81,"Q_Id":54347547,"Users Score":1,"Answer":"wxPython requires it to be the main thread, so I am guessing that is the likely root cause of your issue. You have a couple of good approaches to try though.\nFirst you could launch the Django server process as a thread from your wxPython program. Then you can use wxPython's thread-safe methods (wx.CallAfter, wx.PostEvent) to communicate with the UI.\nOr you could just launch Django separately and log to a file. Then launch wxPython and have it basically tail the log file.","Q_Score":0,"Tags":"django,wxpython","A_Id":54406886,"CreationDate":"2019-01-24T13:15:00.000","Title":"Django logging to wxpython window?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm a beginner to Python and trying to start my very first project, which revolves around creating a program to automatically fill in pre-defined values in forms on various websites.\nCurrently, I'm struggling to find a way to identify web elements using the text shown on the website. For example, website A's email field shows \"Email:\" while another website might show \"Fill in your email\". In such cases, finding the element using ID or name would not be possible (unless I write a different set of code for each website) as they vary from website to website.\nSo, my question is, is it possible to write a code where it will scan all the fields -> check the text -> then fill in the values based on the texts that are associated with each field?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":81,"Q_Id":54350822,"Users Score":1,"Answer":"It is possible if you know the markup of the page, and you can write code to parse this page. In this case you should use xpath, lxml, beautiful soup, selenium etc. You can look at many manuals on google or youtube, just type \"python scraping\"\nBut if you want to write a program able to understand random page on a random site and understand what it should do, it is very difficult, it's a complex task with using machine learning. I guess this task is completely not for beginners.","Q_Score":1,"Tags":"python,python-3.x,selenium-webdriver","A_Id":54351000,"CreationDate":"2019-01-24T16:05:00.000","Title":"Filling forms on different websites using Selenium and Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How might I go about performing automated mobile search using python?\nI have a program exploiting the Microsoft Rewards program, but currently I'm limited to desktop search. The bot performs random searches via bing for various accounts to gain points, later redeemed for voucher codes. \nMy intention is to do the same for mobile.\nI appreciate this is quite a general question, but despite my best efforts, I can't find even a starting point.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":81,"Q_Id":54355902,"Users Score":0,"Answer":"This can be done via a desktop through a browser mobile device simulation.\nChrome browser: More tools -> developer tools -> toggle device toolbar. \nThis can also be done via hotkeys and hence suitable for automation. Now have the program perform searches using the same desktop search protocol; searches will be performed as if they're from a mobile device. \nOthers browsers have this capability.","Q_Score":0,"Tags":"android,python","A_Id":54592411,"CreationDate":"2019-01-24T21:56:00.000","Title":"Performing mobile search on an android device using python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an application engine where in-program communication is done using PyPubSub.\nPlanned is a somewhat responsive GUI that e.g. enables\/disables widgets based on the model state. This would be implemented using wxPython.\nAs wxPython has as an own pubsub lib (which is PyPubSub) that works across the GUI, question is: how to maintain the MVC model.\nIs it possible (and more importantly: does it make sense) to mix the two messaging systems while maintaining the MVC pattern? E.g. to keep these two messaging systems separate while enabling the GUI having subscribers to the topics of the engine?\nOr shall I just use the model's (that is, the app engine's) pubsub within the GUI and not use the wxPython built-in one?\nAny help is appreciated on this rather conceptual question.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":438,"Q_Id":54361345,"Users Score":2,"Answer":"Summary (by author of pypubsub): if you import from pypubsub instead of wx.lib.pubsub, everything will work, you will not have \"two messaging systems\". \nDetails: \nThere is nothing in the wx package that actually uses wx.lib.pubsub; the latter is still in wx.lib only for legacy reasons (see below), and it is entirely your choice whether you want to make use of publish-subscribe in your wxPython application. \nHistory of pypubsub\/wx.lib.pubsub: The wx.lib.pubsub was originally a module developed for wxPython and included in its source code. It was moved out as a standalone library called pypubsub (over 10 years ago!), since nothing in wxPython depended on it, and vice versa. For backwards compatibility, wx.lib.pubsub was kept alive as a specific \"release\" of the standalone pypubsub (for example, wxPython 3 used pypubsub 3.3). However the latest wxPython (4.0.4) has deprecated its wx.lib.pubsub: you should instead install standalone pypubsub directly from pip install or github, and use from pubsub import pub (instead of from wx.lib.pubsub import pub).\nIf you can, you should use wxPython 4.0.4, Python 3.7, and pypubsub 4.0.0 (4.0.1 will be coming out soon and support keyword-only args).","Q_Score":0,"Tags":"wxpython,publish-subscribe,pypubsub","A_Id":54385277,"CreationDate":"2019-01-25T08:15:00.000","Title":"mixed use of PyPubSub and wxPython's built-in pubsub module","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm setting up a webapp with a frontend and a backend that communicates with the frontend soley through RESTful methods. How do I make sure that the backend endpoints are only accessed by my own frontend, and not anyone else? I cannot find much information on this.","AnswerCount":2,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":14150,"Q_Id":54369416,"Users Score":8,"Answer":"Look into CORS. And make sure your server only allows access to specific origins.\n\nOn the backend - check if the X-Requested-With header is present in the request and set to XMLHttpRequest. Without a proper CORS handshake this header will be absent.\n\n\nThat being said, this will only protect your API from being used by other front-end apps or from being accessed directly from a browser address bar - because browsers respect CORS. People can still forge requests programmatically\/CLI and set headers to whatever they want.\nSo this is not actually \"securing\" just a way to prevent abuse & hotlinking","Q_Score":34,"Tags":"python,security,falconframework","A_Id":64536791,"CreationDate":"2019-01-25T16:39:00.000","Title":"How to secure own backend API which serves only my frontend?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a bunch of list of links which I'm doing a specific function on each link, the function takes about 25 sec, I use selenium to open each and get the page source of it then do my function, however whenever I  build the program and cancel the build, I will have to start all over again.\nNote:I get links  from  different webs sitemap.\nIs there a way to save my progress and continue it later on?","AnswerCount":3,"Available Count":1,"Score":-0.0665680765,"is_accepted":false,"ViewCount":797,"Q_Id":54370412,"Users Score":-1,"Answer":"You should save the links in a text file. You should also save the index numbers in another text file, probably initializing with 0.\nIn your code, you can then loop through the links using something like:\nfor link in links[index_number:]\nAt the end of every loop, add the index number to the text file holding the index numbers. This would help you continue from where you left off.","Q_Score":0,"Tags":"python,list,selenium","A_Id":54370470,"CreationDate":"2019-01-25T17:46:00.000","Title":"Continuing where I left off Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Doing a production on EC2, was wondering if it is advisable to start by creating a new user and granting it sudo privileges, since not many people do but I have seen it done","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":34,"Q_Id":54392650,"Users Score":0,"Answer":"Not strictly needed. However, since the username is common and known to everyone, chances are high that someone will be able to access the instance if he comes under the allowed block of IPs and has the pem\/ppk file. May be create a password and disable SSH login for ubuntu, or create a new user and setup keybased\/password_based login for that user, just to be on the safer side.","Q_Score":0,"Tags":"python,amazon-ec2,sudo,devops,production","A_Id":54398348,"CreationDate":"2019-01-27T20:39:00.000","Title":"python production, recommended to create a new user and grant it sudo priviledges to start with?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Doing a production on EC2, was wondering if it is advisable to start by creating a new user and granting it sudo privileges, since not many people do but I have seen it done","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":34,"Q_Id":54392650,"Users Score":0,"Answer":"If the alternative would be logging in as root directly, the answer is yes.\nIt's best to work as a non-root user, with occasional use of sudo.  Doing everyday work as the root user is unsafe.","Q_Score":0,"Tags":"python,amazon-ec2,sudo,devops,production","A_Id":54392745,"CreationDate":"2019-01-27T20:39:00.000","Title":"python production, recommended to create a new user and grant it sudo priviledges to start with?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am using Django 2.0.7, Python 3.7 and Oracle 11g. I cannot change these configurations. Whenever I am trying to migrate my models, I always get the error, 'Missing ALWAYS' which is an error associated with Identity columns.\nI know that Identity columns were introduced from oracle 12. Is there a way to overcome this issue with the version requirements I have?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":107,"Q_Id":54393556,"Users Score":0,"Answer":"I resolved the issue by downgrading django to 1.11. Identity column is not required in versions prior to 2.0.","Q_Score":0,"Tags":"python,django,oracle,oracle11g,cx-oracle","A_Id":54411219,"CreationDate":"2019-01-27T22:43:00.000","Title":"How to solve Identity column missing Always error for oracle 11g, django 2.0.7?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"After I raise the Scrapy exception CloseSpider, I'd like a graceful shutdown with Scrapy executing my pipeline procedures before exiting. \nDoes it do this naturally? Or does it immediately terminate all scripts?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":58,"Q_Id":54394282,"Users Score":0,"Answer":"Because of the time it takes to shut down all the items queued - I thought the implementation was failing. It does go through all the normal close down processes, including finishing the pipeline procedures of the items already scraped.","Q_Score":0,"Tags":"python,python-3.x,scrapy,pipeline","A_Id":54951442,"CreationDate":"2019-01-28T00:47:00.000","Title":"Does the Scrapy CloseSpider exception still redirect to a user-defined pipeline shutdown procedure?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I know to host my Django projects in pythonanywhere or something else. But, I need to know is that possible to host a Django project in Firebase Hosting Services.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1798,"Q_Id":54408058,"Users Score":8,"Answer":"Firebase Hosting only supports static content.  It does not give you a way to run any backend code.  You can use Firebase Hosting to proxy some requests to a Cloud Functions backend, but Cloud Functions provides its own way of handling HTTP requests.","Q_Score":3,"Tags":"django,python-3.x,firebase,django-rest-framework,hosting","A_Id":54409046,"CreationDate":"2019-01-28T18:19:00.000","Title":"Can a Django project be hosted in Firebase? If yes, give me an idea","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"\"Could not find the version that satisfies the requirement virtualenv ( from versions: )\nNo matching distribution found for virtualenv\" is the error message when I try to install virtualenv on my  windows 10.\nI have Googled it and followed several guide but no good result.\nI have uninstalled and installed several lower versions of python, yet the same story.\nI have been stocked for 6 days now trying to install django via pip.\nI don't know what to do again.\nAny true solution to my problem will be appreciated.","AnswerCount":4,"Available Count":1,"Score":-0.0996679946,"is_accepted":false,"ViewCount":13909,"Q_Id":54410591,"Users Score":-2,"Answer":"Please correct your spelling of pip install virtualenvwrapper-win.\nI have also this problem with miss-spelling.","Q_Score":3,"Tags":"python,virtualenv","A_Id":67501331,"CreationDate":"2019-01-28T21:33:00.000","Title":"No matching distribution for virtualenv","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have written a code in python using youtube data API v3 where I am listing playlists created by a user. I have followed the code suggested by youtube API it runs well in local machine but when I deployed the same code on the server, It runs till authentication but after OAuth, it displays Internal server error in the browser instead of the result.\nis there any major changes that I am missing. Please help me with the issue.\nMy code in not running after oauth2callback function runs.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":78,"Q_Id":54418572,"Users Score":1,"Answer":"I solved the error,\nI was deploying without a secure connection and that was raising an error. also redirect URL must be 'https' that was another problem.","Q_Score":0,"Tags":"python,google-oauth,url-redirection,youtube-data-api,google-authentication","A_Id":54624602,"CreationDate":"2019-01-29T10:11:00.000","Title":"Internal server error after I try to host code on server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Scrapy has several points\/places where allowed processing scraped data: spider, items and spider middlewares. But I don't understand where I should do it right. I can process some scraped data in all these places. Could you explain to me differences between them in detail?\nFor example: downloader middleware returns some data to the spider (number, short string, url, a lot of HTML, list and other). And what and where i should do with them? I understand what to do, but is not clear where to do it...","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":347,"Q_Id":54421455,"Users Score":0,"Answer":"I will try to explain in order\nSpider is the one where you decide which URLs to make requests to\nDownloadMiddleware has a process_request method which is called before a request to URL is made, and it has process_response method which is called once response from that URL is received\nPipeline is the thing where data is sent when you yield a dictionary from your Spider","Q_Score":2,"Tags":"python,scrapy,scrapy-spider,scrapy-pipeline","A_Id":54435005,"CreationDate":"2019-01-29T12:47:00.000","Title":"In which file\/place should Scrapy process the data?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In odoo, I'd like to set a default path when upload a binary fields, for example when I upload a file the path should be always : \"\/home\/user1\/Documents\".\nBest regards","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":201,"Q_Id":54423259,"Users Score":0,"Answer":"To fix your problem, please try to set data_dir (like data_dir = \/path\/you\/want) in odoo-server.conf file. Or, you can set odoorc.conf file in home folder.","Q_Score":0,"Tags":"javascript,python-3.x,odoo-11","A_Id":54423524,"CreationDate":"2019-01-29T14:29:00.000","Title":"Set Default path for binary field","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to code in pycharm in debug mode and as I am trying to work out a problem I am typing in the file I am working in.  I am referencing current code in the debug console so I need that to stay.  Unfortunately once I start typing code, flask reloads and I lose my debug console.\n Is there any way to prevent flask from reloading?\nIf I want it to reload I will restart the app manually.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1613,"Q_Id":54424071,"Users Score":6,"Answer":"Check if you have app.run(use_reloader=True). Even if not, put this param and make it False.","Q_Score":5,"Tags":"python,python-3.x,flask,pycharm","A_Id":54424183,"CreationDate":"2019-01-29T15:11:00.000","Title":"prevent flask reload on change","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I wrote a skill for alexa using the proactive notification function from Amazon. \nIt was working fine until yesterday, I could see the amazon echo blinking with yellow color. \nWhen I queried the device \"Alexa, check my notifications\", the information was available.\nHowever today it does not work and I get the following error:\n\"Violations for metadata: [expiryTime should be at least 5 minutes in the future and no more than 24 hours after the current time\"\nThis is the notification I am sending, I include the current time and the expiration time with an offset of 10 minutes. See the example below\nAny idea what could be wrong?\nThanks in advance,\nEster\n{ \"timestamp\": \"2019-01-30T00:11:20\", \"referenceId\": \"98871463\", \"expiryTime\": \"2019-01-30T00:11:30\", \"event\": { \"name\": \"Alerted\", \"payload\": { \"type\": \"AMAZON.MessageGroup.Alerted\", \"messageState\": { \"type\": \"AMAZON.MessageState\", \"status\": \"UNREAD\", \"freshness\": \"NEW\" }, \"message\": { \"type\": \"AMAZON.Message\", \"creator\": { \"type\": \"AMAZON.Person\", \"name\": \"eve\" }, \"count\": 1, \"urgency\": \"URGENT\" } } }, \"relevantAudience\": { \"type\": \"Multicast\", \"payload\": { } } }","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":108,"Q_Id":54438520,"Users Score":1,"Answer":"I found the error. It was a bug in my code. I was sending the incorrect date, the message timestamp was wrongly sent in the past, and the same happened with the expiryTime. So the error sent back by Amazon was correct.","Q_Score":0,"Tags":"python,alexa,flask-ask","A_Id":54506259,"CreationDate":"2019-01-30T10:35:00.000","Title":"Error: Violations for metadata: [expiryTime should be at least 5 minutes in the future and no more than 24 hours after the current time","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a discord  python bot threaded function which fetches data every 5 secs from a website. I ran this bot for just maybe 2-4 hours and now my free dyno hours shows that i have used 27 hours somehow . i am unable to understand how? My Questions -\n1] Does it depend on number of threads running currently? lets say if i have 5 threads currently fetching 5 different datas will the usage of dyno hours increase since i 5 threads are running simultaneously?  \n2] Does it depend on number of deploys? it says i have 24 deploys...so everytime we deploy we use 1 dyno hour? is that so?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":74,"Q_Id":54454518,"Users Score":0,"Answer":"When you are deploying it consumes dyno hours. If you are running 2 deploys simultaneously it is consuming your dyno hours twice as fast.\nIt does not depend on the number of threads running within a single application.","Q_Score":0,"Tags":"python,heroku,discord","A_Id":60352239,"CreationDate":"2019-01-31T06:22:00.000","Title":"Heroku Dyno hours Issue","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have been working on a Django Project for a bit, until I took a break. One month later I dug back in to the project and went to run the server. I received an error:\n django.core.exceptions.ImproperlyConfigured: Requested setting DEBUG, but settings are not configured. You must either define the environment variable DJANGO_SETTINGS_MODULE or call settings.configure() before accessing settings.\nI figured I must have tweaked something by accident. So I created a brand new Django Project (using a virtual environment), and just went to test the server. I received the same error. I tried the python manage.py shell solution listed in another answers but to no avail. \nIf it helps I'm on Linux with Django version 2.1.5 and Python 3.6.\nEdit:\nIf anyone encounters something similar I found using python3 manage.py runserver works in place of using django-admin. Per Greg's answer below, I did begin to receive a new error ModuleNotFoundError: No Module named \"mysite\" exists. I will continue to search for an answer on that front.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":66,"Q_Id":54472388,"Users Score":0,"Answer":"Going off of the comments here.\nIf \"env | grep DJANGO_SETTINGS_MODULE\" returns empty, it means you have to set an environment variable stating where your settings.py file is located.\nThis can be done by doing the following:\nexport DJANGO_SETTINGS_MODULE=mysite.settings\nBe sure to replace \"mysite\" with the name of your app!","Q_Score":0,"Tags":"django,python-3.x","A_Id":54472527,"CreationDate":"2019-02-01T03:17:00.000","Title":"Created a brand new Django Project, attempting to run the server generates an Improperly Configured Error","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have developing kind of chat app. \nThere are python&postgresql in server side, and xcode, android(java) side are client side(Web will be next phase).\nServer program is always runing on ubuntu linux. and I create thread for every client connection in server(server program developed by python). I didnt decide how should be db operations?. \n\nShould i create general DB connection and i should use this\nconnection for every client's DB\noperation(Insert,update,delete..etc). In that case If i create\ngeneral connection, I guess i got some lock issue in future. (When i try to get chat message list while other user inserting)\nIF I create DB connection when each client connected to my server. In that case, Is there too many connection. and it gaves me performance issue in future.\nIf i create DB connection on before each db operation, then there is so much db connection open and close operation. \n\nWhats your opinion? Whats the best way?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":40,"Q_Id":54494695,"Users Score":1,"Answer":"The best way would be to maintain a pool of database connections in the server side.\nFor each request, use the available connection from the pool to do database operations and release it back to the pool once you're done.\nThis way you will not be creating new db connections for each request, which would be a costly operation.","Q_Score":0,"Tags":"python,postgresql,webserver","A_Id":54495609,"CreationDate":"2019-02-02T15:52:00.000","Title":"should i open db connection for every thread?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have been developing a Python app that serves a React frontend with server-side rendering.\nLocally, this has worked fine as I'm able to run two servers on separate ports to handle different parts of my application.  My Python backend receives the initial request and then sends an http request to my Node.js server which does my server-side rendering.  The result is then sent back to my Python backend which injects the server-rendered frontend into the HTML which is sent to the client.\nHowever, Heroku limits applications to a single, dynamically generated port.  This limits me to only running one web server which means I'm no longer able to run my Node.js server to do my server-side rendering.  I have thought of some gimmicky ways to make this work, but I don't want to have to create an entirely new app on Heroku just to run the Node.js server I need.\nI'm not sure how I can make this work with these limitations in place so I'm hoping I can learn some alternative ways to make this work on Heroku.  What are some viable workarounds to handle this problem?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":343,"Q_Id":54497729,"Users Score":0,"Answer":"I think you need to create to separate apps on Heroku(even though you don't want to), as far as I know there's no other available options on Heroku.\nI use Heroku for a SSR application running on two apps. One for frontend(react) and one for backend(nodejs). Works like a charm","Q_Score":1,"Tags":"python,node.js,reactjs,heroku,server-side-rendering","A_Id":54513004,"CreationDate":"2019-02-02T21:32:00.000","Title":"How does server-side rendering work with a non-Node.js backend on Heroku?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am a thirteen-year-old who is learning programming. I know Javascript and Python pretty well, but I mostly program Javascript using Node.js as my compiler.\nI have a pretty na\u00efve question. I am writing an implementation of a circular buffer, and I need to know the remainder when -7 is divided by 3. I went to a Node.js console(version 11.1.0) and a Python console(Python 3.7) and typed in -7 % 3. In the Node.js console, it printed -1, but in the Python console, it printed 2. My question is partially mathematical: Which answer is correct, -1 or 2?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":77,"Q_Id":54501336,"Users Score":1,"Answer":"Both are correct, but they are different things. Python uses actual modulus, which is positive. Javascript does a remainder, which can be negative. \nIf you always need a positive value you can add (a multiple of) the divisor into the value and make sure it\u2019s always larger than zero and will always get the same answer. Or check afterwards for a negative value and add the divisor to get the modulus.","Q_Score":0,"Tags":"javascript,python,node.js","A_Id":54501357,"CreationDate":"2019-02-03T08:57:00.000","Title":"Remainder in Node.js vs Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using Mac OS High Sierra and trying to learn Django framework over Pycharm IDE. But my directories are only read only and so I cannot add more files or make changes on the existing files. I tried in Pycharm > File > Make Directory Writeable but it did not help either. This question has been answered for Windows or Ubuntu but those commands do not work at least on my Mac. Anyone knows how to solve this issue?\nThanks in advance!","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":3519,"Q_Id":54502582,"Users Score":1,"Answer":"Open Terminal\n\nGo to you folder\ncd Desktop\/myfolder\n\nRun this command\nsudo chmod 777 -R *","Q_Score":1,"Tags":"python,django,macos,pycharm","A_Id":67901742,"CreationDate":"2019-02-03T11:55:00.000","Title":"Pycharm (JetBrains) cannot modify the read-only directory on my macbook","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a python code which reads data from one cloud system via rest api using the requests module and then writes data back to another cloud system via rest api . This code runs anywhere from 1 to 4 hours every week. Is there a place in Google Cloud Platform , I can execute this code on a periodic basis. Sort of like a scheduled batch job . Is there a serverless option to  do this in App Engine . I know about the App engine cron service but seems like it is only for calling a URL  regularly . Any thoughts ? Appreciate your help.","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":362,"Q_Id":54526638,"Users Score":0,"Answer":"You can use AI Platform Training to run any arbitrary Python package \u2014 it doesn\u2019t have to be a machine learning job.","Q_Score":0,"Tags":"python-3.x,google-cloud-platform","A_Id":58162476,"CreationDate":"2019-02-05T01:23:00.000","Title":"Advise needed - Running Python code on GOOGLE CLOUD PLATFORM serverless","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have successfully installed flask_bcrypt package using anaconda pip. But I am having a weird problem when I try to import it .Using windows cmd it works well but it fails when I try to do it through anaconda prompt command, jupyter or Spyder ? I tried to restart them and run the command but still having the same problem.Using either jupyter notebook it throws an import error 'cannot import name '_bcrypt'\nbcrypt is required to use Flask-Bcrypt\nImportError                               Traceback (most recent call last)\n in ()\n----> 1 from flask_bcrypt import Bcrypt\n~\\Anaconda3\\lib\\site-packages\\flask_bcrypt.py in ()\n     25 except ImportError as e:\n     26     print('bcrypt is required to use Flask-Bcrypt')\n---> 27     raise e\n     28 \n     29 from sys import version_info\n~\\Anaconda3\\lib\\site-packages\\flask_bcrypt.py in ()\n     22 \n     23 try:\n---> 24     import bcrypt\n     25 except ImportError as e:\n     26     print('bcrypt is required to use Flask-Bcrypt')\nC:\\python\\Lib\\site-packages\\bcrypt__init__.py in ()\n     23 import six\n     24 \n---> 25 from . import _bcrypt\n     26 from .about import (\n     27     author, copyright, email, license, summary, title,\nImportError: cannot import name '_bcrypt'","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":687,"Q_Id":54540020,"Users Score":0,"Answer":"Have you installed bcrypt? Note flask-bcrypt!= bcrypt.","Q_Score":0,"Tags":"python,bcrypt","A_Id":54544870,"CreationDate":"2019-02-05T17:31:00.000","Title":"import bcrypt fails on anaconda cmd and throws an error \"cannot import _bcrpyt\" but works on windows cmd?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a use case in selenium in which the priority of test functions are important. I'm using LiveServerTestCase in flask for tests.\nIn Java, there is a decorator @Test(priority=0) for defining test priorities. My question is what is the equivalent in Flask?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":153,"Q_Id":54551456,"Users Score":0,"Answer":"Test functions are executed according to their names(alphabetical order).","Q_Score":2,"Tags":"python,selenium,liveservertestcase","A_Id":54744338,"CreationDate":"2019-02-06T10:32:00.000","Title":"Selenium test priority in Flask","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am currently developing an embedded multi-touch kivy program with python 3.52 in linux. Kivy is good, but I find GUI developing is quite difficult in some way, and animations are often quite laggy.\nAlso, I found that the program gets quite slow if I put many widgets in a single page. My program contains a lot of widgets so I am also thinking implementing a webview could help.\nSo I am looking for html and css views in particular screens for better look and feel (and maybe improvement of animation by using transition?).\nI've found Cefpython, but it says it works only for python 2.7 and says it is not stable. And it seemed like it is just getting url from the internet not bringing html and css from a file system. (Correct me if I am wrong.)\nActually, I don't even need a function as a browser, and all I need is html & css for UI\/UX development for couple of screens. \nMy embedded system doesn't always support internet(meaning it should work without internet). So I can't put any url in it. Once again, I am only trying to use them for styling. Is there a good way of doing it? Or there is no such thing that I want?\nOr is there any other recommendation?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":4686,"Q_Id":54559271,"Users Score":1,"Answer":"No, unless you are willing to implement html and css parsers and a web renderers, of course. I would say it's better to find why you find it difficult to do certain things with kivy, and how to remedy that. I've yet to find an UI\/layout\/template that is easier to do with the web technologies than with kivy, but i'm way more profficient at kivy than at web front end, so i might be biased.","Q_Score":5,"Tags":"python,html,css,embedded,kivy","A_Id":54582469,"CreationDate":"2019-02-06T17:24:00.000","Title":"Can I use html&css in kivy and python3?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to use the h2o package. I'm running macOS Mojave with Anaconda installed. \nI've done a pip install h2o and it was successful. It installed at location \/anaconda\/lib\/python3.6\/site-packages. \nI try to import it and get this error message: \"H2O requires colorama module of version 0.3.8 or newer. You have version 0.3.7.\"\nBut when I do pip show colorama it says I have version 0.4.1, so the error message doesn't make sense. It's installed at the same location as h2o at  \/anaconda\/lib\/python3.6\/site-packages\nAny thoughts?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":222,"Q_Id":54564735,"Users Score":1,"Answer":"If you are using Anaconda, I would recommend creating a new conda environment and then conda installing all the packages you need (for H2O you would use conda install -c h2oai h2o=3.22.1.2 ). This will help prevent package conflicts or having trouble pointing to the correct version.\nyou should also run conda list to see whether you have another version of colorma installed. Alternatively, you could do a pip uninstall colorama and see whether H2O still picks up a 0.3.7 version - at the very least it will help reveal whether you have multiple versions.","Q_Score":0,"Tags":"python,installation,version,h2o,colorama","A_Id":54581287,"CreationDate":"2019-02-07T00:40:00.000","Title":"Python package thinks I have older version of dependency than I do","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Here is a scenario for a system where I am trying to understand what is what:\nI'm Joe, a novice programmer and I'm broke. I've got a Flask app and one physical machine. Since I'm broke, I cannot afford another machine for each piece of my system, thus the web server, application and database all live on my one machine.\nI've never deployed an app before, but I know that a server can refer to a machine or software. From here on, lets call the physical machine the Rack. I've loaded an instance of MongoDB on my machine and I know that is the Database Server. In order to handle API requests, I need something on the rack that will handle HTTP\/S requests, so I install and run an instance of NGINX on it and I know that this is the Web Server. However, my web server doesnt know how to run the app, so I do some research and learn about WSGI and come to find out I need another component. So I install and run an instance of Gunicorn and I know that this is the WSGI Server. \nAt this point I have a rack that is home to a web server to handle API calls (really just acts as a reverse proxy and pushes requests to the WSGI server), a WSGI server that serves up dynamic content from my app and a database server that stores client information used by the app.\nI think I've got my head on straight, then my friend asks \"Where is your Application Server?\"\nIs there an application server is this configuration? Do I need one?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":59,"Q_Id":54565501,"Users Score":0,"Answer":"Any  basic server architecture has three layers. On one end is the web server, which fulfills requests from clients. The other end is the database server, where the data resides.\nIn between these two is the application server. It consists of the business logic required to interact with the web server to receive the request, and then with the database server to perform operations. \nIn your configuration, the WSGI serve\/Flask app is the application server.\nMost application servers can double up as web servers.","Q_Score":0,"Tags":"python,web-applications,webserver,terminology,application-server","A_Id":54565677,"CreationDate":"2019-02-07T02:36:00.000","Title":"Understanding each component of a web application architecture","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My team are developing a payment system for our web services. The site is built using Django, with the payment services provided by stripe. We are using dj-stripe to integrate the two.\nFor development we are using the stripe test environment, but we are doing this on multiple development servers, each with it's own dev DB.\ndj-stripe identifies which customer to associate payment, card and source activity with using the dj-stripe customer id. This causes a conflict in the information for customers with the same ids on different development severs.\nWe have thought of a number of workarounds for this, the top two choices are;\n1) Generate an offset in the customer ids to prevent clash. The issue is this may break down as time goes on, with more developers joining. It fixes the issue for now, but doesn't guarantee it won't be an issue again.\n2) Create a stripe account for each developer to ensure no clashes and only use the test environment. However, this seems like something stripe wouldn't be happy with if we end up with many devs working on the project.\nI am interested in whether there is a standard solution or best practices for this issue.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":31,"Q_Id":54577860,"Users Score":0,"Answer":"In case anyone comes here for a similar issue, Stripe responded very quickly to our question on this. They already have a feature to deal with this, it just wasn't immediately obvious to us.\nStripe have a feature for you to add multiple accounts from your dashboard. You can simple create an account for each developer and just use the test keys for that account. Then invite all developers in your team to have read access to the account so that everyone can see the logs.","Q_Score":0,"Tags":"python,django","A_Id":54596638,"CreationDate":"2019-02-07T16:26:00.000","Title":"Dj-stripe conflicts with multipe development severs","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm writing code (Python 3) that collects data on a small IOT device and uploads it to a database on AWS. Currently the data is sent by parsing it into a json string and sending it via post request. There can be quite a lot of data at times, and I'm wondering if I can send it in compressed form using a post request.\nWhat I don't want to do is take the data, compress it to a file, then read that file's raw data into a string, and place that string in the JSON. It would be a waste to save a file and immediately read from it.\nIs there a way to compress data directly into a string of raw data, and send the compressed string as opposed to compressing into a file and reading it?\nI need a lossless compression format, hopefully something that's not too resource intensive to compress\/decompress. A .npy compression would be especially nice.","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":528,"Q_Id":54582085,"Users Score":1,"Answer":"You seem to have binary data since you mention npy.\nJust send the binary data in the POST body.\nIf you need to compress signals then that is a different problem.\nMost measurements are not very compressible losslessly. \nYou might need to lower the precision of your floats or do some signal processing on device like low pass filtering noise, bandpass limit, delta compression.\nFor good results there are powerful lossy quantization algorithms like mp3 is using. But those are complex to understand and get right.","Q_Score":0,"Tags":"python,post,upload,binary-data,http-compression","A_Id":54584614,"CreationDate":"2019-02-07T20:52:00.000","Title":"Compressing data to string for json post without saving files","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm writing code (Python 3) that collects data on a small IOT device and uploads it to a database on AWS. Currently the data is sent by parsing it into a json string and sending it via post request. There can be quite a lot of data at times, and I'm wondering if I can send it in compressed form using a post request.\nWhat I don't want to do is take the data, compress it to a file, then read that file's raw data into a string, and place that string in the JSON. It would be a waste to save a file and immediately read from it.\nIs there a way to compress data directly into a string of raw data, and send the compressed string as opposed to compressing into a file and reading it?\nI need a lossless compression format, hopefully something that's not too resource intensive to compress\/decompress. A .npy compression would be especially nice.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":528,"Q_Id":54582085,"Users Score":0,"Answer":"Your not going to POST anything if  your device is connecting via MQTT to AWS IoT core I assume?  That's normally a lighter weight setup then HTTP and MQTT is preferred in real IoT dev.  The best way to handle these things unless you want to program the compression algorithm on the device, is to send your data through AWS IoT Core and connect a Lambda action to that incoming message.  Then program the Lambda to do any file manipulation or compression before dispatching the info to DynomoDB or S3 directly from Lambda.","Q_Score":0,"Tags":"python,post,upload,binary-data,http-compression","A_Id":54611972,"CreationDate":"2019-02-07T20:52:00.000","Title":"Compressing data to string for json post without saving files","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have two different automation framework in python for my test cases\nFramework-1-is old and is going to be deprecated \nFramework-2-is New one with enhanced capabilities \nfor time being i wanted to merge coverage HTML report generate by both framework till the time all TC's from framework will get ported to framework 2\nIs there anything available ?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":307,"Q_Id":54587583,"Users Score":0,"Answer":"You can't merge the HTML reports, but you could combine the data files from the two test runs (using the coverage combine command), and then generate an HTML report from the combined data.","Q_Score":1,"Tags":"python,coverage.py","A_Id":54611211,"CreationDate":"2019-02-08T07:11:00.000","Title":"Merge html coverage reports from two different frameworks generated from coverage.py","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on a template generated from VS 2017 Community for Python\/Django web application. \nI can't seem to get the CSS to work.\nI looked at the page source and it is referencing the correct style sheet.I\nadding a class (class=\"test\") to to h4 in the .html file so that I can target it through the CSS \nin the site.css I have .test{\n`color: red;'\n}\nbackground, I started by trying to add a \"tooltip\" to this sheet. When that didn't work I went back to a simple manipulation just to see if I could get that to work.\nPlease let me know if you need other code snippets!\nother aspects of the code work as expected it's just styling that is giving me fits.\nPretty new at this so please be just a little forgiving! :)\nI wonder if maybe classes and id's from a template are not influenced by site.cs?\nTurns out, there is a difference between hitting refresh in the browser and ctrl + \"r\". Ctrl + \"r\" refreshed the page (without cache i'm guessing) and the changes I made were displayed.\nI added a custom.css file to the \"content\" folder under \"app\" folder.\nI then added a link to that sheet in the \"layout.html\" file\n     \nI can see my changes now. \nMight be a beginner mistake but at least I can move forward now.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":54,"Q_Id":54611741,"Users Score":0,"Answer":"I was able to resolve this. \"control\" + \"r\" helped.\nall my CSS seems to be working now.\nThanks fo responding Arturo.","Q_Score":1,"Tags":"django,python-3.x","A_Id":54660644,"CreationDate":"2019-02-09T23:11:00.000","Title":"VS 2017 Python\/Django Template- CSS doesn't work but inline styling does","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on a report template in Odoo 9 qweb template and I need to use OR logical operator in t-field to get data from one of the two fields that I want to print their value in my report. Can I use OR here in t-field or I should use t-if with different span tags?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1208,"Q_Id":54615152,"Users Score":2,"Answer":"The t-field directive can only be used when performing field access (a.b) on a \u201csmart\u201d record (result of the browse method)  \n\nYou need to use the conditional directive t-if as you said.","Q_Score":2,"Tags":"python,xml,odoo","A_Id":54615255,"CreationDate":"2019-02-10T09:43:00.000","Title":"How to use OR condition in t-field in qweb template in Odoo 9?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have one Django app and in the view of that I am using gzip_str(str) method to compress data and send back to the browser. Now I want to get the original string back in the browser. How can I decode the string in JS.\nP.S. I have found few questions here related to the javascript decode of gzip string but I could not figure out how to use those. Please tell me how can I decode and get the original string.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2530,"Q_Id":54615204,"Users Score":0,"Answer":"Serve the string with an appropriate Content-Encoding, then the browser will decode it for you.","Q_Score":0,"Tags":"javascript,django,python-3.x,gzip","A_Id":60143329,"CreationDate":"2019-02-10T09:51:00.000","Title":"how to decode gzip string in JS","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am building social network platform where users can register to their profile, fill it up and create events for the others. My problem is that I don't know what is the best approach to create tables.\nOne guy told me I should normalize table, meaning - he wants me to create separated tables for city, country, university, company and later connect those information with an SQL Query, which makes sense for me. If I will get 100 of students to sign up from the same University it makes sense for me to call only one University Name from University table instead of having rows and rows with university name filled in - it's data redundancy. \nHowever, the other guy told me, it's a bad practice, and I should put all information inside one user table - firstName, lastName, profileIMG, universityName, CompanyName, cityName, CountryName and so on. He says more tables create more problems. \nFrom my part, I do understand the logic of the first guy, but here is my other problem. As I mentioned, users fill up their resume in their profile and I want them to be allowed to add up to 3 universities they had been attending - bachelor degree, master degree, and postdoc. The same I want to allow them with companies - they can add up to three previous companies they worked for. \nI thought I will create University table where I will have this: universityName_1, universityName_2, universityName_3. The same I want to do with the company table. \nIs this a good practice? \nMaybe, I just should create the university Table with an UniversityName column, and when it comes to retrieving data from database, I would just use SQL query inside my Django project to call a specific University for the specific position? Like I call Columbia University for 2nd position (universityName_2)? \nI am very new to this topic! I hope that I presented you my problem clearly!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1006,"Q_Id":54621204,"Users Score":0,"Answer":"The \u201csecond guy\u201d probably doesn't understand relational database very well.\nIf a person has relationships with universitys and companys, add a table person_university that has foreign keys to both person and university and contains the details of the relationship. The primary key of that table would be a composite one, consisting of the two foreign keys. The same for companies.\nThat is the canonical way to store such relationships in a database. What you cannot model that way is the limit of three, but that can be handled by your application.","Q_Score":0,"Tags":"python,django,postgresql","A_Id":54626857,"CreationDate":"2019-02-10T21:24:00.000","Title":"How to normalize the tables inside PostgreSQL database","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I watched a tutorial that requires me to have Django 2.1.\nWhen I type in \"python -m django --version\" - my Ubuntu terminal says 1.11.18 But, when I type \"django-admin --version\" - terminal says 2.1 This didn't bother me until I reached part 6 of this series, I'm heavily invested now with a serious problem I can't figure out. I even completely reinstalled my OS, (I was running Linux mint, thought it'd be easier if I ran Ubuntu) I ran through a myriad of different \"fixes\" I found online, but nothing seemed to fix this.\nThe main issue that I ran into from the tutorial is the urls linking.\nEDIT:\nI have Python 3.6 installed","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":576,"Q_Id":54622277,"Users Score":1,"Answer":"You need to be using Python-3 to use Django-2.1. Django 1.11 is the last version to support Python 2.7.","Q_Score":1,"Tags":"django,python-2.7","A_Id":54622895,"CreationDate":"2019-02-10T23:40:00.000","Title":"\"python -m django --version\" 1.11.18 Cannot update to 2.1","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"This is an open source contributor project for Wikidata's Chronic Pain project.\nI would like to create a webpage that :\n\nHave inputboxes where the user select several wikipedia page titles (with suggestions)\nCan also take these parameters via the URL\nGet items metadata from Wikidata.\nMakes a SPARQL request to gather scholarly articles.\nRender data from Wikidata and Wikipedia, linking to various wiki pages. \n\nThe webpage will be hosted on Wikimedia fundation server. I have access to a linux container as well as a Jupyter Notebook (not sure this one is suitable for this project). It has to be coded in Python 3 since I will use Pywikibot framework to interact with Wikidata.\nI'm new to programming so that I don't really know what is the best approach. I heard that it was difficult to code webpages in Python without using a framework like Django. However this page is very simple so that it may not be the most efficient to deploy Django for this ?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":35,"Q_Id":54628685,"Users Score":1,"Answer":"NB : your question is bordering on \"primarily opinion based\" (which doesn't mean it's a bad question by itself but that answers might be more, well, opinions than hard facts). \nThis being said, \"a single interactive page\" doesn't mean the server code behind is just loading a static html file and sending it to the client. For example, the main UI part of our product is, technically speaking, \"a single interactive page\", but this \"single\" page is full react app and is backed by a dedicated API with a dozen entry points, which the dispatch to a whole load of backend code including database access, celery tasks etc. It would of course be technically possible to code all this with only pure wsgi or even plain old cgi code, but well, it could also be possible to write it directly in C or even assembly and no one would ever consider this a viable solution.\nTo make a long story short: do not even waste your time trying to code this project with plain wsgi (and let's not talk cgi), you will end up reinventing the squared wheel and everyone will hate you for this (stakeholders because you'll never deliver a robust, working product in due time and budget, and other devs because they'll now have to port the whole darn thing to a stable, mature and maintained framework).  Now if Django appears to be  overkill for this project there are much lighter frameworks like flask. Actually both are the \"industry standard\" and safe choices.","Q_Score":1,"Tags":"django,python-3.x,webpage,wikipedia,wikidata","A_Id":54629877,"CreationDate":"2019-02-11T10:40:00.000","Title":"Is it an efficient method to use a framework to code a single interactive webpage in python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Was trying to execute python script in jenkins, that make HTTP request with help of 'requests' module, but got stuck with following error:\nImportError: No module named requests\nBuild step 'Custom Python Builder' marked build as failure\nFinished: FAILURE","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":4697,"Q_Id":54634554,"Users Score":0,"Answer":"You need to install the dependencies of the script, normally in setup.py or requirements.txt.\nIn the case of requirements.txt run: pip install -r requirements.txt\nIn the case of setup.py run: pip install .\nYou should do this in the job that is running the script.\nIf neither of these files exist pip install requests will include the particular dependency you are missing in your question.","Q_Score":0,"Tags":"python,jenkins,python-requests","A_Id":54634665,"CreationDate":"2019-02-11T16:07:00.000","Title":"Jenkins: ImportError: No module named requests","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an angularjs and a python project. The angularjs for the frontend and the python part is for the trainings made for face recognition. I wanted to know if there is a way that my angular can communicate with python and if it can, how to use the functionalities of python project in the angular.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":133,"Q_Id":54635555,"Users Score":0,"Answer":"Create an  API in python console application \ncall http get put etc  from angular .","Q_Score":0,"Tags":"python,angularjs","A_Id":54635610,"CreationDate":"2019-02-11T17:01:00.000","Title":"How to create communication between python(not web) and angularjs","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am building a rest api and I was making the routes for the api and stumbled upon a problem. I am using flask restplus to build the api and marshmallow to validate the json sent by the client.\nMy design: I use a decorator that is used to wrap every api route. this decorator validates the json sent by the client against a marshmallow schema and if the json validates, then the decorator lets the api route run. Otherwise, if the json invalidates when it's checked against the schema, it returns the errors that it got when it invalidated the json back to the client without running the route. \nI really like this design as it significantly reduces code repetition and it can automatically validate and invalidate the data posted by the client without me doing pretty much the same thing in each api route -- checking the json sent by the client and then running the route.\nMy only issue is that I have no clue how to unit test this. I have written tests for the specific marshmallow json schemas to check if they raise the correct validation errors when invalid data is passed to them. However, now I need to test the api routes to check if they return the validation errors raised by the schemas. This seems like a lot of repetition of unit tests because I'm checking for the same errors when testing the schemas and again when I'm testing the api routes\/decorator.\nTherefore, do you guys have any recommendation of how I should unit test this. Should I test the api routes specifically, the decorator separately, and the schemas separately? Or should I test just the api routes to check they return the correct errors that the schemas raise?\nThanks in advance.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":471,"Q_Id":54699540,"Users Score":0,"Answer":"This could be a matter of opinion.\nI don't think it is useful to test all schemas, unless they include some custom code like custom fields, validators, etc. There is no need to test marshmallow itself, as it is already extensively covered by its own tests. So testing a marshmallow schema would only serve the purpose of checking you entered the correct field names and validators. That would be quite verbose for low benefits, IMHO.\nI would test the decorator: create a dummy test route, decorate it, check the correct error is returned.\nDeciding whether it is worth testing all routes for all kinds of errors is up to you. As long as your decorator is tested, testing the routes just checks that the decorator is applied to the route with the correct schema.\nSome would argue that, on the contrary, they only care about the API itself and they only need to test the routes. But this means testing all cases on all routes, so that's a lot of duplication. And I don't think this qualify as unit testing, rather integration testing.\nNote you could try to use webargs (maintained by marshmallow team) to replace your decorator, but I don't know how easy it is to integrate to flask-restplus.","Q_Score":0,"Tags":"python,unit-testing,flask,python-decorators,marshmallow","A_Id":54705145,"CreationDate":"2019-02-14T21:45:00.000","Title":"Testing a decorator that wraps api routes","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm upgrading a Django project from Django 1.11 to Django 2.1.7, and after changing all the URL patterns to the Django 2 way of doing things, I'm getting a bunch of false positives on the urls.W001 warning when I do manage.py runserver.\nExample:\n?: (urls.W001) Your URL pattern '^some-pattern\/$' [name='some_name'] uses include with a route ending with a '$'. Remove the dollar from the route to avoid problems including URLs.\nWhen I look at that URL pattern in my urls.py file, however, it absolutely doesn't have a ^ or $ in it.\npath('some-pattern\/', views.some_view_function, name='some_name'),\nI've blown away both my local virtualenv and my Vagrant box and started from scratch just to make sure it's not some lingering compiled stuff somewhere, but the behavior is the same when starting from scratch.\nHas anyone else run into this? The app itself seems to run fine, I'm just flummoxed at where Django might be seeing things that don't exist anywhere in my code.\nThanks for any ideas anyone might have.","AnswerCount":3,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":813,"Q_Id":54712982,"Users Score":4,"Answer":"Turns out this was indeed related to Django CMS -- this is the first release of theirs that supports Django 2 but it still supports Django 1.11 also, so they're shooting down the middle in some spots and when it pulls in URLs for our apphooks they get translated into patterns with ^ and $ in the mix. Hope that info helps someone else who may run into this. Thanks for all the suggestions!","Q_Score":2,"Tags":"python,django","A_Id":54715374,"CreationDate":"2019-02-15T16:04:00.000","Title":"Django 2.0 Upgrade - False Positives on urls.W001 Warning","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am handling my second year project which includes some machine learning backend along with a Mobile application front end.In simple terms i am creating\na androing\/react native application which would take an input from the user and prosses in a backend development which includes python for some machine learning.\nMy question is, is it possible  to connect these 2 together. I have gone through some stuff altho i am not very clear on how to create a connection on this. \nAlso some opinions on either i should go with android or react native or any other language to go on python or not would be very  useful. \nThank you","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":809,"Q_Id":54720796,"Users Score":0,"Answer":"Yes. you can develop a python web service (REST OR SOAP) and use this for the backend for your application. \nalso, if you develop a service application (server-client) you must develop a service with python (or any languages) in your server after that connect your mobile application (reactjs, android studio, swift, ...) to this server.","Q_Score":1,"Tags":"java,python,mobile,native,backend","A_Id":54720908,"CreationDate":"2019-02-16T07:18:00.000","Title":"Is it possible to use Python backend and a Android\/Native application as Front end","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am handling my second year project which includes some machine learning backend along with a Mobile application front end.In simple terms i am creating\na androing\/react native application which would take an input from the user and prosses in a backend development which includes python for some machine learning.\nMy question is, is it possible  to connect these 2 together. I have gone through some stuff altho i am not very clear on how to create a connection on this. \nAlso some opinions on either i should go with android or react native or any other language to go on python or not would be very  useful. \nThank you","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":809,"Q_Id":54720796,"Users Score":0,"Answer":"Yes, it is possible.\nFor example, you can use Python as backend (server), with some exposed HTTP \"interface\", then make an Android application that communicates with these Python backend with HTTP request \/ response.\nOr, if you are making a serverless application, you can make this Python backend as a .so library or using SL4A then call them in your Android application.","Q_Score":1,"Tags":"java,python,mobile,native,backend","A_Id":54720835,"CreationDate":"2019-02-16T07:18:00.000","Title":"Is it possible to use Python backend and a Android\/Native application as Front end","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In other words - I want to create a simple Django Rest Framework app which preferable doesn't need it's own database.\nThis Django API app should only provide data for some external frontend app (e.g. Angular\/Webpack stack).","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":229,"Q_Id":54723710,"Users Score":0,"Answer":"There is no technical difference between external and the own database as pointed out by Kalus D. any database which is online and the username and password of it is known (means provided in django's setting.py) is Django's database. There can be multiple Databases of this type. so that's it.\nBut I don't think you mean the above. I think What you mean is collect data from external APIs or web pages e.g Wikipedia Rest API. then process that data like filter it, combine different data or anything you like and then send it to the user.\nthen yes it is possible but you don't need DRF for it. DRF is mainly applicable when you want to serialize your won models data. you can just send response in JSON format insted of html without using DRF.","Q_Score":1,"Tags":"python,django,django-rest-framework","A_Id":54723947,"CreationDate":"2019-02-16T13:44:00.000","Title":"Is it possible to create a Django app which only reads data from external database and provides REST API?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am creating a dynamic blog. I use Django's admin to add posts, and I have created some simple tags that python then substitutes for the actual html and css that are needed by the browser. This makes each blog easier to create and easier to read while creating.\nBefore Django saves the new blog, I've coded my model to send the text to a python script, which parses the code and creates the finished html.\nThis all works great, but I would also like to be able to parse the code before Django loads it, that way I can remove the html\/css programatically, changing it back to the easier to read tags, making it easier to edit an already created blog.\nIs there a way to capture control of Django admin BEFORE it loads model data into the form for editing?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":87,"Q_Id":54734948,"Users Score":1,"Answer":"The more simple solution is to have two fields, the original and the generated HTML.\nUse the original as you are using it now and save the generated HTML to the other field.\nUse the other field for your templates.","Q_Score":0,"Tags":"python,django,django-admin","A_Id":54735147,"CreationDate":"2019-02-17T15:54:00.000","Title":"How to parse text before being loaded into Django's admin for editing","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'd like to build an application (local, not online) by using front-end web technology for the UI, the application simply displays PDFs and has a few text fields for the user to fill in with regards to the current PDF they're viewing, the user can then export their notes and a file path to the document in CSV file format.\ncomment about file, some more notes, C:\\somefolder\\doc1.pdf\ncomment about file, some more notes, C:\\somefolder\\doc2.pdf\nMy first issue, JavaScript can't access the local file system, so I used a file upload form which worked except the filepaths were shown as blob filepaths and not the actual system file path. Other than that my \"application\" worked as intended.\nI went and learned Flask in hopes of using python for the back end, which works great except when I pass in the file path to the pdf C:\\SomeFolder\\doc1.pdf inside the 'src' attribute for an  Chrome says it can't access local files. SO I'm back to sqaure one!\nHow can I go about building this application with local file access?","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1477,"Q_Id":54739824,"Users Score":0,"Answer":"I think mht is exactly what you want. mht is a file extension recongnized by IE. Internally it is an HTML file. IE (only) treats a mht file with the same security restrictions that a exe might have. You could access the file system, delete a file, display a file etc.. It is everything that html\/javascript security was trying to prevent.  Now that IE has changed significantly I don't know what the support for this is nowadays. I couldn't find a reference page to give you a link, but it is simple enough - just save a html file with an mht extension","Q_Score":0,"Tags":"python,html,flask,electron","A_Id":70411775,"CreationDate":"2019-02-18T02:47:00.000","Title":"Building a web application that can work with local files","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to run some automatic scripts on a webpage with selenium and python, but the problem I'm having is that the webpage is loaded using document.write().\nI have to find some elements, but they are not shown because when I view the source, it is shown as document.write(A lot of JS) instead of the html.\nHow can I do it so that I can view the HTML source code? I know there is the function driver.execute_script(), but I have to specify the script to run, and I don't think it will work.\nThe page is correctly rendered, only problem is the source cannot be parsed.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":349,"Q_Id":54781641,"Users Score":0,"Answer":"As it turns out after some digging into the code, Selenium does the search in the rendered final view, but the problem was not the document.write(), but the fact that the field I was looking for was in an iframe, which selenium could not find on the default frame. \nAll I had to do was search through the iframes and find the ones that I needed.","Q_Score":0,"Tags":"javascript,python,selenium-webdriver,document.write","A_Id":54800939,"CreationDate":"2019-02-20T08:14:00.000","Title":"Selenium find element with document.write","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a celery task\/for loop that should run through a specific list of user fields at the database but for some reason, I always get the error:\n...\ntasks.py\n...\nThanks for your help.","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":37,"Q_Id":54782076,"Users Score":0,"Answer":"Replace User.objects.all with User.objects.all()","Q_Score":0,"Tags":"python,django,loops,for-loop,celery","A_Id":54782114,"CreationDate":"2019-02-20T08:42:00.000","Title":"Python go through User fields","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a WebApp on Flask+gunicorn+nginx. I need to send 200 requests from my other server at the same time to a WebApp , save the response and its speed. Also I need to send Json POST in this 200 requests.\nHow to do it right?\nUse python script or CURL?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":123,"Q_Id":54783844,"Users Score":0,"Answer":"I suggest you to use \"Postman\" for any kind of API testing. It is one the best tools available in the market for API testing , monitoring, documenting, and also sharing the results(as well as test scripts) for free.\nIf you don't want to use any other tool, then i suggest you to use a python script.","Q_Score":0,"Tags":"python,curl,flask,server,gunicorn","A_Id":54784754,"CreationDate":"2019-02-20T10:16:00.000","Title":"How to load server with python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm wondering what would be the best practice to update the source code in a docker container that is run within( in JAVA and python). I could either modify my code, create a new image and run a container. In Java,  I would also need to compile the code. \nAnother solution would be to just use a volume to share the code between my machine and the container so that each time I modify the behavior of my code I won't need to create a new docker image.\nI'm asking all of this for development purposes, not deploying\nIs there a best practice between these two solutions? What are the pros and cons? Is there a difference for a compiled language like a java compared to python?","AnswerCount":4,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":1084,"Q_Id":54788991,"Users Score":0,"Answer":"You should make a new image, and if you think creating a new image and deploying is a task for you, than you can setup a CI\/CD pipeline which will automatically compile java code, create a image and will deploy it for you whenever you push a code to GIT.","Q_Score":2,"Tags":"java,python,docker,docker-image","A_Id":54789337,"CreationDate":"2019-02-20T14:46:00.000","Title":"Create a new image or share source code in a volume in a docker container in development?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm wondering what would be the best practice to update the source code in a docker container that is run within( in JAVA and python). I could either modify my code, create a new image and run a container. In Java,  I would also need to compile the code. \nAnother solution would be to just use a volume to share the code between my machine and the container so that each time I modify the behavior of my code I won't need to create a new docker image.\nI'm asking all of this for development purposes, not deploying\nIs there a best practice between these two solutions? What are the pros and cons? Is there a difference for a compiled language like a java compared to python?","AnswerCount":4,"Available Count":3,"Score":0.049958375,"is_accepted":false,"ViewCount":1084,"Q_Id":54788991,"Users Score":1,"Answer":"In general the best practice would be to create a new image when you have new source code and run a new container from that image. Docker can quickly create and run new images, so you should take advantage of that. In addition you can know what version of your code you're running by tagging your images. \nYou mention that you would need to compile the Java code in the Docker case, but you would need to in either case. You could just compile your code into a Jar and then ADD (or COPY) the Jar into your container and run it there.\nA couple of quick downsides that come to mind with the external code approach: you would need some external way to manage what version of code is running, docker tags take care of that for you. You would also need some way to alert the Docker container that a new executable file is ready and then have Docker run that. In addition you would need to make sure that your Docker container is running the same version of Java (or Python) that your system is running, this too is taken care of in Docker since you can build from a Java base image.","Q_Score":2,"Tags":"java,python,docker,docker-image","A_Id":54789428,"CreationDate":"2019-02-20T14:46:00.000","Title":"Create a new image or share source code in a volume in a docker container in development?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm wondering what would be the best practice to update the source code in a docker container that is run within( in JAVA and python). I could either modify my code, create a new image and run a container. In Java,  I would also need to compile the code. \nAnother solution would be to just use a volume to share the code between my machine and the container so that each time I modify the behavior of my code I won't need to create a new docker image.\nI'm asking all of this for development purposes, not deploying\nIs there a best practice between these two solutions? What are the pros and cons? Is there a difference for a compiled language like a java compared to python?","AnswerCount":4,"Available Count":3,"Score":0.0996679946,"is_accepted":false,"ViewCount":1084,"Q_Id":54788991,"Users Score":2,"Answer":"You should definitely make a new image instead of sharing the code via a mounted volume. Then whole docker ideology is to produce a self-contained \"service\", which can be portable across server (i.e. copy the image). Yuo docker file and image build process will track versions of your code, i.e. in your docker file you can pull a specific branch, or you can tag the image with a specific tag.\nIn case of a mounted volume, you never sure what version of your code is actually. run.\nHope this reason alone will help you to decide.","Q_Score":2,"Tags":"java,python,docker,docker-image","A_Id":54789199,"CreationDate":"2019-02-20T14:46:00.000","Title":"Create a new image or share source code in a volume in a docker container in development?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am working on a project named project.py.\nI want to set an encryption on it, so that once it's finished and running only the admin can stop the program, and another user who isn't an admin using it can't terminate it. Even if the user closes the program, it will still continue to run in the background.\nIs this possible, and if so, how can I go about doing this?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":24,"Q_Id":54795509,"Users Score":0,"Answer":"I want to make it that only the admin can stop the program and another user who isn't an admin using it can't terminate it\n\njust run your script under admin user, any other user who has no root\/admin\/superuser permissions won't be able to terminate process running under another user, operating system won't allow this.","Q_Score":0,"Tags":"python","A_Id":54796437,"CreationDate":"2019-02-20T21:28:00.000","Title":"How can I prevent my application to not be turned off without admin permission?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am making APIs.\nI'm using CentOS for web server, and another windows server 2016 for API server.\nI'm trying to make things work between web server and window server.\nMy logic is like following flow.\n1) Fill the data form and click button from web server\n2) Send data to windows server\n3) Python script runs and makes more data\n4) More made data must send back to web server\n5) Web server gets more made datas\n6) BAMM! Datas append on browser!\nI had made python scripts.\nbut I can't decide how to make datas go between two servers..\nShould I use ajax Curl in web server?\nI was planning to send a POST type request by Curl from web server to Windows server.\nBut I don't know how to receipt those datas in windows server.\nPlease help! Thank you in advance.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":213,"Q_Id":54799927,"Users Score":1,"Answer":"First option: (Recommended)\nYou can create the python side as an API endpoint and from the PHP server, you need to call the python API.\nSecond option:\nYou can create the python side just like a normal webpage and whenever you call that page from PHP server you pass the params along with HTTP request, and after receiving data in python you print the data in JSON format.","Q_Score":0,"Tags":"php,python,curl","A_Id":54800059,"CreationDate":"2019-02-21T05:36:00.000","Title":"Run python script by PHP from another server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a git submodule B, that works as an app in my django project A. B has its own Pipfile and Pifile.lock. A also has a Pipfile and Pipfile.lock. How can I use pipenv, to install the libraries  from both pipfiles within the same virtuaelenv?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":1110,"Q_Id":54815737,"Users Score":2,"Answer":"go to the directory where each pipfile exist and run pipenv install. Make sure your virtualenv is activated.","Q_Score":4,"Tags":"python,django,git-submodules,pipenv","A_Id":54816103,"CreationDate":"2019-02-21T20:31:00.000","Title":"using pipenv with git submodules","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Also from my understanding if I download a package in a virtual environment if I come back to it, will still be there however my django package is gone. why is that?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":70,"Q_Id":54834799,"Users Score":0,"Answer":"I can't add a comment since I don't have enough reputation but here are a few things you can do to debug this problem.\n\nCheck that you activated the correct virtualenv (or pipenv).\nOnce activated, run pip freeze in the terminal and check if django comes up as one of the packages installed.\nIf django doesn't show up there, you will need to install it again.","Q_Score":0,"Tags":"python,django,virtualenv","A_Id":54834859,"CreationDate":"2019-02-22T20:36:00.000","Title":"(virtual env)(global env) why is this happening instead of just (virtual env) when I activate it?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Also from my understanding if I download a package in a virtual environment if I come back to it, will still be there however my django package is gone. why is that?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":70,"Q_Id":54834799,"Users Score":0,"Answer":"Yes you have to install it again as a virtualEnv isolate your previous installation","Q_Score":0,"Tags":"python,django,virtualenv","A_Id":54834830,"CreationDate":"2019-02-22T20:36:00.000","Title":"(virtual env)(global env) why is this happening instead of just (virtual env) when I activate it?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to install a virtual env. for python django.\nwhen I try pip freeze to check django version it says \"segmentation fault core dumped\"\nwhile using pip install django command its giving the same error","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":509,"Q_Id":54841131,"Users Score":0,"Answer":"Actually ans is simple, it needs admin rights, so use sudo pip install django","Q_Score":0,"Tags":"django,python-3.x,virtualenv","A_Id":54841166,"CreationDate":"2019-02-23T11:32:00.000","Title":"while checking the command pip freeze, the segmentation fault error is showing","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is there an option to use an image uploaded to telegram (file_id couldn't do it) inside InlineQueryResultArticle thumb_url?\nnotes:\nI tried to get the file path using getfile() but it didn't do the trick.\neven tried to upload a very small image size with no luck.\nI'd like to ignore the InlineQueryResultCachedPhoto option since the design is not the same\nany thoughts?\nthank you!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":321,"Q_Id":54859470,"Users Score":0,"Answer":"I also checked that the telegram does not show the uploaded image, I think it is better to give the address of the picture directly.","Q_Score":1,"Tags":"python-telegram-bot","A_Id":69072827,"CreationDate":"2019-02-25T04:24:00.000","Title":"InlineQueryResultArticle - thumb_url uploaded image","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm new to Flask and web development in general. I have a Flask web-application that is using SQLAlchemy, is it ok to put session.rollback at the beginning of the app in order to keep it running even after a transaction fails?\nI had a problem with my website when it stopped working after I was attempting to delete records of one table. The error log showed that the deletion failed due to entries in another table still referencing these records as their foreign key. The error log suggested using session.rollback to rollback this change, so I put it at the beginning of my app just after binding my database and creating the session and my website worked. This gave me the hint to leave that line there. Is my move right, safe and ok? Can anyone tell me what is the correct thing to do if this is somewhat endangering the functionality or logic of my website by any chance?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":68,"Q_Id":54861925,"Users Score":1,"Answer":"You should not use the rollback at the beginning but when a database operation fails.\nThe error is due to an integrity condition in your database. Some rows in your table are being referenced by another table. So, you have to remove referencing rows first.","Q_Score":0,"Tags":"python,session,flask,sqlalchemy,rollback","A_Id":54868874,"CreationDate":"2019-02-25T08:10:00.000","Title":"In a Flask application that is using SQLAlchemy, is it ok to permanently put `session.rollback` at the beginning of the app?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm currently in the process of learning how to use the Python Pyramid web framework, and have found the documentation to be quite excellent.\nI have, however, hit a stumbling block when it comes to distinguishing the idea of a \"model\" (i.e. a class defined under SQLAlchemy's declarative system) from the idea of a \"resource\" (i.e. a means of defining access control lists on views for use with Pyramid's auth system).\nI understand the above statements seem to show that I already understand the difference, but I'm having trouble understanding whether I should be making models resources (by adding the __acl__ attribute directly in the model class) or creating a separate resource class (which has the proper __parent__ and __name__ attributes) which represents the access to a view which uses the model.\nAny guidance is appreciated.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":181,"Q_Id":54869002,"Users Score":1,"Answer":"I'm having trouble understanding whether I should be making models resources (by adding the acl attribute directly in the model class) or creating a separate resource class\n\nThe answer depends on what level of coupling you want to have. For a simple app, I would recommend making models resources just for simplicity sake. But for a complex app with a high level of cohesion and low level of coupling it would be better to have models separated from resources.","Q_Score":5,"Tags":"python,python-3.x,pyramid","A_Id":54891000,"CreationDate":"2019-02-25T15:00:00.000","Title":"Is a Pyramid \"model\" also a Pyramid \"resource\"?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Debugger is active!\nDebugger PIN: 620-122-212\n\nI see this when I run the flask app and i'm trying to understand where it will get used?\nPlease let me know!","AnswerCount":2,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":21618,"Q_Id":54883379,"Users Score":21,"Answer":"This is an additional security measure provided by Werkzeug (which is one of the dependencies for Flask) to prevent the debugger from being accessible without the knowledge of the PIN. You can use the debugger pin in the browser to launch the interactive debugger.\nPlease note you should never be using DEBUG mode in Production anyways because the stack trace of error can potentially reveal multiple aspects of your code.\nThe Debugger PIN is a just an added layer of security in case you inadvertently leave the Debug mode on in an Production application to make it difficult for the attacker to access the debugger .","Q_Score":24,"Tags":"python,flask","A_Id":54883878,"CreationDate":"2019-02-26T10:29:00.000","Title":"What is Debugger PIN when I run the flask app python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"When using the SignedCookieSessionFactory, the documentation states that the sha512 HMAC digest algorithm is used. As a result of this, once session data is serialised, it is signed and sent to the user's client under the session cookie.\nThere is no mention in Pyramid's documentation that sessions are also cached server-side (under this SessionFactory).\nThis presents a contradiction and has also led to authentication confusion when paired with SessionAuthenticationPolicy. If session data cannot be retrieved from the client's session cookie (as it is one-way hashed), how is it that the following is possible?\n\nAuthenticate with the application such that reading Request.authenticated_userid does not return None.\nCopy the session cookie to the clipboard.\nLogout by accessing a view whereby the headers from forget(request) are returned in the Response.\nReplace the session cookie with the copied value.\nThe user is now logged back in.\n\nI understand that simply deleting the cookie client-side is insufficient to completely invalidate the session (without blacklisting), but this then poses the following questions:\n\nHow is it possible to remain secure with browser-scoped sessions unless every session cookie the user has recently been issued is somehow remembered and blacklisted\/invalidated?\nIs the session cookie actually a key\/session ID that's being used to lookup a session in memory? As it's one-way signed, surely this is the only explanation?\nIs it possible then to invalidate sessions server-side, a little more robust than just the headers=forget(request) pattern?\n\nUltimately, I imagine the answer is something along the lines of:\n\"Maintain server-side sessions using an include such as pyramid_redis_sessions\"\nAny explanation would be appreciated.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":146,"Q_Id":54887668,"Users Score":3,"Answer":"The cookie contains all of the data. The session content itself is stored in the cookie, alongside an hmac signature of that content. This means that a client may view the content if they try hard enough, but they cannot change it as they cannot create trusted signatures without the server-side secret.\n\nHow is it possible to remain secure with browser-scoped sessions unless every session cookie the user has recently been issued is somehow remembered and blacklisted\/invalidated?\n\nIt depends what you're using the session for - you need to take these issues into consideration before putting data into a session object.\n\nIs it possible then to invalidate sessions server-side, a little more robust than just the headers=forget(request) pattern?\n\nNot unless you store some sort of id in the session and then a server-side table of blacklisted ids. If you did this then you could write your own wrapper session-factory that opened the session, checked the id, and returned an empty one if it was blacklisted. Of course then you might just want to use a server-side session library like pyramid_redis_sessions or pyramid_beaker with one of its server-side-storage backends.","Q_Score":4,"Tags":"python,python-3.x,pyramid","A_Id":54893292,"CreationDate":"2019-02-26T14:23:00.000","Title":"If Pyramid sessions are one-way hashed and not stored server-side, where is the data coming from?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Right now I'm using virtualenv and just switching over to Pipenv. Today in virtualenv I load in different environment variables and settings depending on whether I'm in development, production, or testingby setting DJANGO_SETTINGS_MODULE to myproject.settings.development, myproject.settings.production, and myproject.settings.testing. \nI'm aware that I can set an .env file, but how can I have multiple versions of that .env file?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":5010,"Q_Id":54896106,"Users Score":4,"Answer":"You should create different .env files with different prefixes depending on the environment, such as production.env or testing.env.  With pipenv, you can use the PIPENV_DONT_LOAD_ENV=1 environment variable to prevent pipenv shell from automatically exporting the .env file and combine this with export $(cat .env | xargs).\nexport $(cat production.env | xargs) && PIPENV_DONT_LOAD_ENV=1 pipenv shell would configure your environment variables for production and then start a shell in the virtual environment.","Q_Score":12,"Tags":"python,virtualenv,pipenv","A_Id":54896172,"CreationDate":"2019-02-27T00:06:00.000","Title":"Pipenv: Multiple Environments","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm new to django, I want to register users using different tables for different users like students, teaching staff, non teaching staff, 3 tables.\nHow can i do it instead of using default auth_users table for registration","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":125,"Q_Id":54906708,"Users Score":0,"Answer":"cf Sam's answer for the proper solutions from a technical POV.  From a design POV, \"student\", \"teaching staff\" etc are not entities but different roles a user can have. \nOne curious things with living persons and real-life things in general is that they tend to evolve over time without any respect for our well-defined specifications and classifications - for example it's not uncommon for a student to also have teaching duties at some points, for a teacher to also be studying some other topic, or for a teacher to stop teaching and switch to more administrative tasks. If you design your model with distinct entities instead of one single entitie and distinct roles, it won't properly accomodate those kind of situations (and no, having one account as student and one as teacher is not a proper solution either). \nThat's why the default user model in Django is based on one single entity (the User model) and features allowing roles definitions (groups and permissions) in such a way that one user can have many roles, whether at the same time or in succession.","Q_Score":1,"Tags":"python,django","A_Id":54907387,"CreationDate":"2019-02-27T13:33:00.000","Title":"how to register users of different kinds using different tables in django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm new to django, I want to register users using different tables for different users like students, teaching staff, non teaching staff, 3 tables.\nHow can i do it instead of using default auth_users table for registration","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":125,"Q_Id":54906708,"Users Score":0,"Answer":"In Django authentication, there is Group model available which have many to many relationship with User model. You can add students, teaching staff and non teaching staff to Group model for separating users by their type.","Q_Score":1,"Tags":"python,django","A_Id":54906887,"CreationDate":"2019-02-27T13:33:00.000","Title":"how to register users of different kinds using different tables in django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am automating our mobile app on iOS and Android. When I get the search results(list of elements), I want to iterate through those all elements matching my xpath.\nThe problem is that - Appium returns only those elements which are visible in the viewport, which makes sense. However, I would like to get all elements matching my xpath\/locator strategy, although the elements are not in viewport. To get further set of elements, I have to scroll to those elements and get them into viewport.\nIs there any configuration provided by appium, to enable this feature? Or will I have to continue scrolling to those elements before accessing?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":57,"Q_Id":54912357,"Users Score":0,"Answer":"You need to handle scrolling on your own.\nOn Android, Appium can make a snapshot of what is currently in the viewport.\nYou can get a list of elements and iterate them, then scroll by screen hight and get another list of elements, iterate them. Repeat it until the new list is empty - make sure you don't get same elements twice.\nOn iOS, it's more tricky: the driver will return you elements including the ones not in the viewport. For reliable interaction, I suggest scrolling to each element.","Q_Score":0,"Tags":"python-2.7,appium","A_Id":54922735,"CreationDate":"2019-02-27T18:36:00.000","Title":"How to get all items matching xpath, which are not in viewport?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have tried looking in documentation and such, but not able to find a way to scroll down to bottom of page while using pyppeteer library with python3. \nWould be great if anyone could point me to the right direction or solution.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1061,"Q_Id":54919761,"Users Score":0,"Answer":"I was able to resolve this by doing something like this. \nawait page.hover(\".class name\")\nThanks everyone","Q_Score":0,"Tags":"python-3.x,puppeteer,pyppeteer","A_Id":54921731,"CreationDate":"2019-02-28T06:34:00.000","Title":"Is there a way to scroll to end of page in pyppeteer","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My Spyne server WSDL shows \n<soap:address location=\"http:\/\/some-domain.com>\nI want it to show https instead of http.\nBasically, <soap:address location=\"https:\/\/some-domain.com>\nNotice the difference lies in http and https.\nHow do I tell my Spyne server to address this?\nHave gone through the docs multiple times but could not figure it out.\nThanks!","AnswerCount":2,"Available Count":1,"Score":-0.0996679946,"is_accepted":false,"ViewCount":274,"Q_Id":54920093,"Users Score":-1,"Answer":"WSDL url is constructed from the first request.\nUpon starting the server, request the wsdl from the secure domain and it should work.","Q_Score":0,"Tags":"python,soap,https,spyne","A_Id":54932502,"CreationDate":"2019-02-28T07:00:00.000","Title":"Spyne SOAP server WSDL file cannot show https","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have developed a Tensorflow based machine learning model on local Machine. And I want to deploy it in Google Cloud Platform (Cloud ML Engine) for predictions.\nThe model reads input data from Google Bigquery and the output predictions has to be written in Google Bigquery only. \nThere are some data preparation scripts which has to be run before the model prediction is run. I have used Google Cloud Storage for model storage and used it for deployment, i have deployed it successfully. \nBut, instead of using Google Cloud Storage for saving a model (i.e. .pb or .pkl model file) can i store it on GCP VM (Or Local machine) and call it from Cloud ML Engine for prediction? Is it possible? or I have only a option to upload Model directory to a Cloud Storage bucket which i will use it for prediction?\nCould you please help me on this.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":147,"Q_Id":54923211,"Users Score":0,"Answer":"For model deployment you need a Google Cloud Storage using AI Platform.\nAnother option is to use AI platform training (local or in GCP), output the model (SavedModel format) to a local folder or Cloud Storage and from there using TF Serving in Compute Engine Instance.","Q_Score":2,"Tags":"python,google-cloud-ml","A_Id":56553227,"CreationDate":"2019-02-28T10:14:00.000","Title":"Model Deployment On GCP Without Cloud Storage Bucket","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"When using the jira python library and creating issues, non mandatory fields are being enforced on create_issue call. \nResponse on create issue attempt:\ntext: No issue link type with name 'Automated' found.\n\nResponse on create meta call to check mandatory fields:\n\n'hasDefaultValue': False,\n                                                               u'key': u'issuelinks',\n                                                               u'name': u'Linked Issues',\n                                                               u'operations': [u'add'],\n                                                               u'required': False,","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":217,"Q_Id":54929685,"Users Score":0,"Answer":"Jira behaves strange many times.\ncreatemeta call returns you all the possible issuetypes, and their all fields, and which field is mandatory or not.\nBut even after this, there are certain fields which are mandatory but createmeta wont tell you this. You need to rely on the exception message that you got after filing create_issue().\nIn the exception message, exception_obj.response.text gives you the json having key\/value of exact field required. \nThen, you can search in response of createmeta about its schema type, and may be the allowedValues set.\nAnd, then try again.\nBasically, you need to do retry of above mechanism.","Q_Score":1,"Tags":"python,jira,jira-rest-api,python-jira","A_Id":56360789,"CreationDate":"2019-02-28T16:00:00.000","Title":"Python JIRA Non-Mandatory fields being forced on create issue","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Django project that will have multiple instances, one for each of my clients, each instance have your own DB and some custom APPs and your own domain, but all share the same source code, the only difference will be the settings.py file pointing for the correct DB.\nI know I can achieve this using different virtual hosts pointing to different settings using for exemple Apache and WSGI, but in my case I will use AWS Lambda and Zappa to provide this service for my clients.\nI want to know if exists a way to dynamically load some custom settings depending on the domain that loads the site.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":515,"Q_Id":54933044,"Users Score":0,"Answer":"You can convert settings.py to settings folder and create as many domain's setting you would like to add. I would create base.py for common setting and then each domain which has a specific setting should import base.py and additional domain specific settings.\nDirectory structure would be:\n\nsettings:\n\nbase.py\ndomain_1.py\ndomain_2.py\n...\n\n\nWhen you load domain_1 then try to load using python manage.py runserver --settings=settings.domain_1.py and request.meta['HTTP_HOST'] can give you domain name.","Q_Score":1,"Tags":"python,django,aws-lambda,wsgi,zappa","A_Id":54933461,"CreationDate":"2019-02-28T19:37:00.000","Title":"Different settings.py file for different domains in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've read around and see this has to do with concurrency, that celery can't edit the app variables because it's in a different thread from a python app. So instead I'm modifying the database by creating an object in the hope that django signal would've picked it up, but it's not. I'm doing this since I need to know if an update has occured in the back end so the SPA front end can fetch it automatically. Any tips?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":104,"Q_Id":54939449,"Users Score":0,"Answer":"Django signals only work in-process.  So making a model change in celery will trigger the signal to occur in celery.  If you need to notify a single page app either (1) use a websocket or (2) pass the SPA the task_id so it can poll for when the task is complete and then take the necessary action.","Q_Score":0,"Tags":"python,django-models,celery","A_Id":54991229,"CreationDate":"2019-03-01T06:56:00.000","Title":"Celery task creates a new model object, but django signals doesn't pick it up","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My girlfriend has been given the task of getting all the data from a webpage. The web page belongs to an adult education centre. To get to the webpage, you must first log in. The url is a .asp file. \nShe has to put the data in an Excel sheet. The entries are student names, numbers, ID card number, telephone, etc. There are thousands of entries. HR students alone has 70 pages of entries. This all shows up on the webpage as a table. It is possible to copy and paste.\nI can handle Python openpyxl reasonably and I have heard of web-scraping, which I believe Python can do.\nI don't know what .asp is.\nCould you please give me some tips, pointers, about how to get the data with Python? \nCan I automate this task? \nIs this a case for MySQL? (About which I know nothing.)","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":60,"Q_Id":54943792,"Users Score":1,"Answer":"This is a really broad question and not really in the style of Stack Overflow. To give you some pointers anyway. In the end .asp files, as far as I know, behave like normal websites. Normal websites are interpreted in the browser like HTML, CSS etc. This can be parsed with Python. There are two approaches to this that I have used in the past that work. One is to use a library like requests to get the HTML of a page and then read it using the BeautifulSoup library. This gets more complex if you need to visit authenticated pages. The other option is to use Selenium for python. This module is more a tool to automate browsing itself. You can use this to automate visiting the website and entering login credentials and then read content on the page. There are probably more options which is why this question is too broad. Good luck with your project though!  \nEDIT: You do not need MySql for this. Especially not if the required output is an Excel file, which I would generate as a CSV instead because standard Python works better with CSV files than Excel.","Q_Score":0,"Tags":"python","A_Id":54944088,"CreationDate":"2019-03-01T11:32:00.000","Title":"Get data from an .asp file","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My girlfriend has been given the task of getting all the data from a webpage. The web page belongs to an adult education centre. To get to the webpage, you must first log in. The url is a .asp file. \nShe has to put the data in an Excel sheet. The entries are student names, numbers, ID card number, telephone, etc. There are thousands of entries. HR students alone has 70 pages of entries. This all shows up on the webpage as a table. It is possible to copy and paste.\nI can handle Python openpyxl reasonably and I have heard of web-scraping, which I believe Python can do.\nI don't know what .asp is.\nCould you please give me some tips, pointers, about how to get the data with Python? \nCan I automate this task? \nIs this a case for MySQL? (About which I know nothing.)","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":60,"Q_Id":54943792,"Users Score":1,"Answer":"Try using the tool called Octoparse.\nDisclaimer: I've never used it myself, but only came close to using it. So, from my knowledge of its features, I think it would be useful for your need.","Q_Score":0,"Tags":"python","A_Id":54945063,"CreationDate":"2019-03-01T11:32:00.000","Title":"Get data from an .asp file","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"If I have 1 Django project and multiple Django apps. Every Django app has it's own requirements.txt and settings. Hence every app has its own docker image. My doubt is, can I execute code from one Django app to other Django app while both apps have a different container?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":181,"Q_Id":54971769,"Users Score":2,"Answer":"No, in the context of Django an \u201capp\u201d is a code level abstraction so they all run in one process, which means one image. You can, sometimes, break each app into its own project and have then communicate via the network rather than locally, this is commonly called \u201cmicroservices\u201d and smaller images is indeed one of the benefits.","Q_Score":0,"Tags":"python,django,docker,kubernetes","A_Id":54973667,"CreationDate":"2019-03-03T17:39:00.000","Title":"Can django project and django app have different docker image?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have used django-private-chat for implementing one to one chat in my django project,But the problem is,it doesn't show unread message notification to user who as unread messages. I can't seem to find a way to implement this functionality.Can anyone please help me out with this.Thanks in advance","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":286,"Q_Id":54972026,"Users Score":1,"Answer":"You'll have to use CSS and JS to do it.And write a Model for notification which will be update every time new notification is there.","Q_Score":1,"Tags":"javascript,python,django","A_Id":57076772,"CreationDate":"2019-03-03T18:07:00.000","Title":"unread notification in django-private-chat","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to count words which their visibility are visible in browser.\nI'm using Scrapy to get link and parse theme with Selector.\nProblem is I can only count all texts in spite of their visibility (hidden, in menu, in blockquote...) and the searching sites is a list of url (not the same structure)\nDo you have any suggestion?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":54,"Q_Id":54994471,"Users Score":0,"Answer":"Scrapy just give you the page source(ctrl+u) to get the rendered page you have to use the Selenium  or splash my splash is little speed compare to the Selenium but Selenium give you full control","Q_Score":0,"Tags":"python,web-scraping,scrapy","A_Id":55007667,"CreationDate":"2019-03-05T02:15:00.000","Title":"How to imitate the browser to find & count text","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"1 I get the warning msg when I pip install my Django project requirements \n\nwechat-sdk 0.6.4 has requirement requests==2.6.0, but you'll have\n  requests 2.9.1 which is incompatible.\n\n2 then follow the tips I uninstall requests and install proper version, but I get another warning\n\npython-social-auth 0.2.21 has requirement requests>=2.9.1, but you'll\n  have requests 2.6.0 which is incompatible.\n\nSo, I'm trapped in the endless loop\nCan anyone give any advice?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":2681,"Q_Id":54995091,"Users Score":2,"Answer":"As far as I can see you have the following options:\n\nRun pip with the --no-dependencies argument and hope it will just work. pip install wechatpy --no-dependencies (or whatever the package is called, I am not familiar with it) for example. This ignores the dependencies when installing. Maybe the requirements are outdated and this will let you proceed. For this you most likely want to satisfy the requests>=2.9.1 requirement so you should install python-social-auth normally and then try the other package without dependencies.\nLook for older versions of the packages you are installing that have compatible requirements. Depending on the setup of your project this might not be possible to do because you need features of the later versions (or the old versions might be insecure).\nYou can try patching one of your requirements locally (download from the source, change the code to make it work with the conflicting requests version). And then import the local version of the packages. Remember to remove the requirement from your project's requirements.txt in this case to stop other people working on \/ using your project from running into the same issue, and include the local version as part of the project (track it on Git). Check the license of the packages you are modifying to see if you are allowed to modify and redistribute them. (Optional: Make a pull request on the packages' Github with your change(s) so other people can benefit from them)\nReplace one or both of the packages by something else. They might just not be compatible or using a local, modified version might not be viable.","Q_Score":2,"Tags":"python,django,pip,ubuntu-14.04","A_Id":54995422,"CreationDate":"2019-03-05T03:43:00.000","Title":"Endless loop incompatible when I pip install requirements (Django1.99)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using uWSGI to deploy my WSGI application. Are the Python file compiled for every request, or are they precompiled once? I don't see any .pyc files.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":801,"Q_Id":55000167,"Users Score":2,"Answer":"Python caches modules bytecode - directly in the same location for python2.x, under a __pycache__ subfolder for python3 - but scripts (the difference is in usage - if you import it it's a module, if you execute it it's a script) are always recompiled (which is why main scripts are usually very very short an simple).\nIOW, your main wsgi  script will be recompiled once for each new server process. Typically a wsgi app is served as a long running process which will handle much more than one single request, so even then the initial compilation overhead is really not an issue (short script + only compiled once per process)...\nAlso, once a Python process is started, imported modules are cached in memory so they are only really imported (loaded) once per process. \nJust note that the user under which the process is running must have write permissions on your app's directory in order to create the .pyc files... and of course read permissions on the .pyc files too.","Q_Score":2,"Tags":"python,uwsgi,wsgi","A_Id":55002715,"CreationDate":"2019-03-05T10:03:00.000","Title":"Does uWSGI use precompiled Python files?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to generate image on which will be lines representing distances between frets on guitar. It is supposed to be printed later and act as mask for marking the frets. Therefore, the distances has to be precise.\nHow can i generate image of specific size in centimeters \/ milimeters, so when I print it, it will have same size?\nI can use Python \/ JS \/ Java \/ C++","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":34,"Q_Id":55024085,"Users Score":0,"Answer":"As @Chris G wrote in the comment:\n\nGenerating an image is pixel based. If you create an image that has a line every 300 pixels and print it at 300dpi, the lines will be exactly one inch apart. (dpi = dots per inch). You can set the dpi in Photoshop for instance, then make sure the image is printed @ 100% scaling. (in case it's not clear: the \"digital distance\" doesn't matter, since you can always adjust the dpi to achieve a specific millimeter distance in the printout)\n\nFor example, if I make an image of size 6*300px and 9*300px and I print it with 300dpi, it will be 6x9 inches on paper.","Q_Score":0,"Tags":"javascript,java,python,image,printing","A_Id":55024955,"CreationDate":"2019-03-06T13:19:00.000","Title":"How to generate image of specific real-world size","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a view with two actions.\nFirst one renders FileInput for csv. After submit, I read csv header and render the template for second action with dropdown containing header items. \nAfter dropdown items are selected and submitted, I want to read csv file, saving selected columns to db in second action.\nHow can I pass file from one action to another?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":248,"Q_Id":55026932,"Users Score":0,"Answer":"Short answer: you can't. The solution here is to store the file somewhere and save the file path in session, then read the path back from session and re-read the file.\nAlso, having the same view doing so many things is possibly not the best design, but YMMV...","Q_Score":0,"Tags":"python,django","A_Id":55027170,"CreationDate":"2019-03-06T15:41:00.000","Title":"Django Pass file from one view action to another","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a view with two actions.\nFirst one renders FileInput for csv. After submit, I read csv header and render the template for second action with dropdown containing header items. \nAfter dropdown items are selected and submitted, I want to read csv file, saving selected columns to db in second action.\nHow can I pass file from one action to another?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":248,"Q_Id":55026932,"Users Score":0,"Answer":"pickle the file and store the pickle details in session from the view and access the pickle details from session in another view .","Q_Score":0,"Tags":"python,django","A_Id":55027637,"CreationDate":"2019-03-06T15:41:00.000","Title":"Django Pass file from one view action to another","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My organization uses the lambda handler naming convention of:\n lambda.[team_name]-[function_name]\nIn an attempt to deploy a cloud formation template with a few lambda functions that are named in this way, but deployment fails due to a syntax error in the definition of the function.\nI've tried removing the dashes in the handler name, and this removes the syntax error--but now I don't have permission to work with the lambda function as the handler doesn't follow our naming conventions.\nHas anyone dealt with anything like this, what was your workaround?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":1358,"Q_Id":55031481,"Users Score":1,"Answer":"Haven't came across this, but if it brakes with that convention your org have to decide on replacing the convention. And who have a period (.) as a function name. That's a flag for me. \nAnd for the immediate issue, it is the IAM role\/group that was assigned to you doesn't have that modified lambda name. So you cannot  do anything with it","Q_Score":0,"Tags":"python-3.x,amazon-web-services,aws-lambda","A_Id":55033120,"CreationDate":"2019-03-06T20:14:00.000","Title":"AWS Lambda Handler Naming Convention","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"The context here is simple, there's a lambda (lambda1) that creates a file asynchronously and then uploads it to S3.\nThen, another lambda (lambda2) receives the soon-to-exist file name and needs to keep checking S3 until the file exists.\nI don't think S3 triggers will work because lambda2 is invoked by a client request\n1) Do I get charged for this kind of request between lambda and S3? I will be polling it until the object exists\n2) What other way could I achieve this that doesn't incur charges?\n3) What method do I use to check if a file exists in S3? (just try to get it and check status code?)","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":783,"Q_Id":55031936,"Users Score":0,"Answer":"Let me make sure I understand correctly. \n\nClient calls Lambda1. Lambda1 creates a file async and uploads to S3\nthe call to lambda one returns as soon as lambda1 has started it's async processing. \nClient calls lambda2, to pull the file from s3 that lambda1 is going to push there. \n\nWhy not just wait for Lambda one to create the file and return it to client? Otherwise this is going to be an expensive file exchange.","Q_Score":0,"Tags":"python-3.x,amazon-web-services,amazon-s3,aws-lambda,boto3","A_Id":55032258,"CreationDate":"2019-03-06T20:52:00.000","Title":"Long polling AWS S3 to check if item exists?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Django and Python 3.7.  I want to write a script to help me easily migrate my application from my local machien (a Mac High Sierra) to a CentOS Linux instance.  I'm using a virtual environment in both places.  There are many things that need to be done here, but to keep the question specific, how do I determine on my remote machine (where I'm deploying my project to), what dependencies are lacking?  I'm using rsync to copy the files (minus the virtual environment)","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":63,"Q_Id":55035229,"Users Score":2,"Answer":"On the source system execute pip freeze > requirements.txt, then copy the requiremnts.txt to the target system and then on the target system install all the dependencies with pip install -r requirements.txt.  Of course you will need to activate the virtual environments on both systems before execute the pip commands.\nIf you are using a source code management system like git it is a good idea to keep the requirements.txt up to date in your source code repository.","Q_Score":1,"Tags":"django,python-3.x,centos,dependencies","A_Id":55035280,"CreationDate":"2019-03-07T02:42:00.000","Title":"How do I figure out what dependencies to install when I copy my Django app from one system to another?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I know my question title is a little confusing , but i want to do this : \nI have a project that's include these things : \n1- A landscape page with html,css,...\n2- A Django Admin-Panel for a mysql database . \nI'm using a VPS (Virtual Private Server) , and this VPS have not required disk space , i want to use Django admin-panel in local and give it to my employer , but i dont want to give the source code to him , is there any way to hide the source code from my employer but still give him the django admin panel to use on his own computer ?","AnswerCount":1,"Available Count":1,"Score":-0.1973753202,"is_accepted":false,"ViewCount":738,"Q_Id":55037608,"Users Score":-1,"Answer":"If you're on the same network and not running Django behind a VM, you can run python manage.py runserver 0.0.0.0.0. Your employer will be able to access your Django admin via your internal IP:80 (or whatever port you choose to use).\nAlternatively you can route your ports and firewall to your local IP port.","Q_Score":0,"Tags":"python,django,django-admin","A_Id":55037843,"CreationDate":"2019-03-07T06:45:00.000","Title":"How to hide source code of django from user?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm new to both angular and flask framework so plz be patient with me.\nI'm trying to build a web app with flask as a backend server and Angular for the frontend (I didn't start it yet), and while gathering infos and looking at tutorials and some documentation (a little bit) I'm wondering: \nDoes Angular server and flask server need both to be running at the same time or will just flask be enough? Knowing that I want to send data from the server to the frontend to display and collecting data from users and sending it to the backend. \nI noticed some guys building the angular app and using the dist files but I don't exactly know how that works.\nSo can you guys suggest what should I have to do or how to proceed with this?\nThank you ^^","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1198,"Q_Id":55040986,"Users Score":1,"Answer":"Angular does not need a server. It's a client-side framework so it can be served by any server like Flask. Probably in most tutorials, the backend is served by nodejs, not Flask.","Q_Score":0,"Tags":"angular,python-3.x,flask","A_Id":55041112,"CreationDate":"2019-03-07T10:03:00.000","Title":"Does angular server and flask server have both to be running at the same?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I wrote a Django app that collects data from clients and displays them in it's web app.\nNow I want to write a script\/program (WPF or a small Java App) that manages the Django server. Things like Start\/Stop, update Django files, migrate Data etc.\nReason is: I want to stuff all of that into an .exe, maybe with a setup and licensing for my potential customers.\nWhat would be the most professional attempt to do this? I wrote smaller scripts before and built them with pyInstaller, which does not seem to work with Django. Or should I just install a python interpreter with my setup and just run the python files? Then my code would be visible to my customers.\nAny tips are appreciated.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":53,"Q_Id":55042674,"Users Score":0,"Answer":"you have two options really. either run the app on the customer's hardware or your own. if you don't want your code exposed you should consider hosting the application yourself and providing them with authentication \nDjango authentication is actually pretty robust, check out these two articles from the official docs. This is a general tutoria on authentication l: docs.djangoproject.com\/en\/2.0\/topics\/auth\/customizing\/\u2026 and this is a broader scope one on django in general docs.djangoproject.com\/en\/2.0\/intro\/tutorial01 \nEdit: just do it here","Q_Score":0,"Tags":"python,django,release","A_Id":55043382,"CreationDate":"2019-03-07T11:25:00.000","Title":"Django Server inside another program","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a blog website backend is Python + Django + DRF. On frontend I have React. \nAt the article page I want to have \"related articles\" section and \"popular articles\". The same I want to have for the root page. For me is so important that these sections will be \"user specefic\". For example if user have been reading a lot about \"France\" it would influence to recommended articles and this topic will have more weight than other.\nHow can I do that?\nCan I do that with python?\nWhat technology should I use?\nThank you!","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":53,"Q_Id":55043950,"Users Score":1,"Answer":"This Question has nothing to do with Django or Reactjs. What you are looking for are algorithms for recommender systems.","Q_Score":0,"Tags":"python,django,reactjs,django-rest-framework","A_Id":55044483,"CreationDate":"2019-03-07T12:35:00.000","Title":"Make related articles feature with python and django or react","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I hope this is not a opinion based question but more like a solutions to a complicated django website. fyi, i am quite a beginner in django. \nfirst of all, i am doing a complicated accounting django website where there are features like:\n\npurchases (purchase order, quotation request, quotation, invoice, do)\nCustom user roles and permissions, because we want user to setup their own roles and permissions system\nsales (POS, stocks, too many to mentions)\nuser and registrations\nincomes & expenses tracking and reporting.\n\nThere are articles and SO's answers about 'many apps vs 1 large app'. My confusion started. I figured out django allows seperating views.py and models.py into multiple file in app\/views and app\/models with init.py imports.\nI personally do not like large app file as it is hard to locate things. I prefer neat structures. But the confusion keeps attacking. I want to do one thing and do it well but it seem like having one large app makes more sense because all the mentioned features are ForeignKey dependent.\nSo, according to your experience. what's your ideal folder structures and solutions to deal with this?\nIf you could provide performance difference that would be helpful.\nUPDATE:\nSince most people said multi apps, I have last question regarding this.\nSince Django app can have models\/ & views\/ folder with  multiple models.py & views.py inside, that means one large app can be seperated into multiple views files inside a views\/ folder. What yall think about this? \nsince this will put all migrations in one place, does it provide long term safety in term of messy things like foreign keys across apps.","AnswerCount":3,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":1861,"Q_Id":55056365,"Users Score":3,"Answer":"This kind of question I have asked long time back, on different platform. Common answer is \n\nIf you want to reuse that, then create an app or if you don't want\n  then you no need to make a separate app\n\nLet me give you an example. If your project has features like \n\nSharing an Image\nSharing text\nComment on Media and Text\nUpvote and Downvote options\n\nHere an user can share either a image or text and other can comment on it or Upvote\/Downvote it. In this case If you make Comment a separate app and Upvote\/Downvote a separate app, then in future if you have to add Video along with Image and Text, then all you have to link Video to Comment app and Upvote\/DOwnvote app, that will be less task comparing to a big app with all things inside. Also You can manage your database accordingly.\nIn your case, you can make (for example), \n\nCustom User (help you add extra permission in future)\nProduct Category (help you to add more category or subcategory)\nProducts or Sales etc.\n\nFor many admins, when you add those apps to your settings.py, and if you edit admin.py separately in each app, everything will appear your admin panel without any hassle.\nFor many views, you can import all the models to views.py of any app or use it separately in their apps. It will not cause any problem. Same for urls.py and forms.py etc.","Q_Score":3,"Tags":"python,django,django-2.1","A_Id":55058386,"CreationDate":"2019-03-08T03:38:00.000","Title":"Django Structures: Many apps VS one large app","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I hope this is not a opinion based question but more like a solutions to a complicated django website. fyi, i am quite a beginner in django. \nfirst of all, i am doing a complicated accounting django website where there are features like:\n\npurchases (purchase order, quotation request, quotation, invoice, do)\nCustom user roles and permissions, because we want user to setup their own roles and permissions system\nsales (POS, stocks, too many to mentions)\nuser and registrations\nincomes & expenses tracking and reporting.\n\nThere are articles and SO's answers about 'many apps vs 1 large app'. My confusion started. I figured out django allows seperating views.py and models.py into multiple file in app\/views and app\/models with init.py imports.\nI personally do not like large app file as it is hard to locate things. I prefer neat structures. But the confusion keeps attacking. I want to do one thing and do it well but it seem like having one large app makes more sense because all the mentioned features are ForeignKey dependent.\nSo, according to your experience. what's your ideal folder structures and solutions to deal with this?\nIf you could provide performance difference that would be helpful.\nUPDATE:\nSince most people said multi apps, I have last question regarding this.\nSince Django app can have models\/ & views\/ folder with  multiple models.py & views.py inside, that means one large app can be seperated into multiple views files inside a views\/ folder. What yall think about this? \nsince this will put all migrations in one place, does it provide long term safety in term of messy things like foreign keys across apps.","AnswerCount":3,"Available Count":2,"Score":0.0665680765,"is_accepted":false,"ViewCount":1861,"Q_Id":55056365,"Users Score":1,"Answer":"For your own sanity go for multiple apps.\njust lay them out first and figure out what should logically go together in one app and what should go to the next.\nYou want to avoid running into circular imports!\nForeign keys across apps is no problem at all. Basically as soon as u use the USER anywhere in your models, you'll reference across app boundaries already.","Q_Score":3,"Tags":"python,django,django-2.1","A_Id":55067563,"CreationDate":"2019-03-08T03:38:00.000","Title":"Django Structures: Many apps VS one large app","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"my problem is the following: I have an application in ruby \u200b\u200bon rails that I would like to update in realtime, second by second. I would not, however, overload the database unnecessarily (because too many users and small server). I would like the ruby \u200b\u200bon rails application to be notified in some way by the mysql database when an update occurred in some datqabase table. It's possible?\nI have a python script that in realtime could populate with new data the mysql tables.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":33,"Q_Id":55060125,"Users Score":0,"Answer":"I'm not sure what problem you're trying to solve. Won't the rails app get the updated data from the db on each request anyway? Are you caching the data? If that's the case just have the python script invalidate the cache.","Q_Score":0,"Tags":"python,mysql,ruby-on-rails,web-applications,real-time","A_Id":55074611,"CreationDate":"2019-03-08T09:22:00.000","Title":"How to correctly update webapp when cron brings new data","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have all of my TestCase files in a django app called 'tests'. Running a specific TestCase works just fine with this command:\npython run manage.py test tests.myTestCaseFile\nHowever, when i run the entire set of TestCases in the tests folder this fails:\npython run manage.py test tests\nIn this case many ImportErrors are triggered as well as KeyError: 'en-us'. Essentially every single TestMethod errors out in one way or another.\nAny ideas what could be happening here? \nNOTE: I have already tried to import myapp.urls in the shell and reverse(urlname) works just fine there..","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":682,"Q_Id":55070109,"Users Score":3,"Answer":"I've solved this issue:\n\nKeyError: u'en-us' seems to occur anytime there is an import error in any test module\n\nI had a test file which was testing functionality that did not exist in the current branch. \nSeems that an import error in any test file prevents execution of the entire test suite.","Q_Score":1,"Tags":"python,django,django-nose","A_Id":55961188,"CreationDate":"2019-03-08T19:52:00.000","Title":"Django-nose failure - KeyError: u'en-us'","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it possible to create an Combobox with checkboxes with wxpython? \nLike most webpages have filter options in a drop down list for products where you could choose which Brand (etc.) you want.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":318,"Q_Id":55076458,"Users Score":1,"Answer":"Try with a ComboCtrl with a CheckListBox popup, or with a wx.ListCtrl plus \nCheckListCtrlMixin if you need more than one column.","Q_Score":1,"Tags":"python,wxpython","A_Id":55080070,"CreationDate":"2019-03-09T10:38:00.000","Title":"wxPython - Combobox with Checkboxes possible?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How to expire django rest framework JWT token manually ? Because it does not store the token in the database. Is there any correct way to expire the token ? \nI am thinking to continue with middleware where token will be stored per user. At every login request we will update the token in the db for a user. At every request, we will fetch the token from request and comapre with the stored token and if doesnt match then we'll return the forbidden. I dont know its a correct way or not !!","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":1025,"Q_Id":55101650,"Users Score":2,"Answer":"You can't expire JWT token, the token is self contained and can only be expired after amount of time that's stored in its payload.\nWhat you can do is to use both refresh and access token, and set little amount of time for access token. With that being said you FE should update access token when it's expired. You should store your refresh token in database, and when you need to delete access token, you can stop user from updating it using refresh token.\nEDIT:\nIf you want to store token in database, you probably don't wanna use JWT and stateless authorization at all. Instead stick with session based authorization. When you want to expire token - you can just delete session from DB.\nUPDATE 2:\nWhat people usually do in this situation is having a fast-access DB (like redis) that has very few items. Instead of storing jwt token in the database we create a table that contains blocked tokens (I assume the amount of deleted tokens would be much less than amount of alive ones). BUT, now you sacrifice stateless authorization in favor of checking if a token is in the database every time you authorize a user.","Q_Score":4,"Tags":"django,python-3.x,django-rest-framework,jwt,django-rest-framework-jwt","A_Id":55101714,"CreationDate":"2019-03-11T12:14:00.000","Title":"Django rest framework JWT , delete the jwt token","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to create a docx file with my python code using a html content. Im directly writing into file with .docx extension.\n   This is opening in Libre office but unfortunately in MS Word it is not opening. It showing as corrupted format. Why this is happening?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":50,"Q_Id":55104454,"Users Score":0,"Answer":"I was wrong. MS word wont support .docx format. Instead use .doc format which will support in both application!!!","Q_Score":0,"Tags":"html,python-2.7,docx","A_Id":55512004,"CreationDate":"2019-03-11T14:47:00.000","Title":"Save html content as docx format which is not opening in ms word","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am getting the error\ndjango.db.utils.OperationError: FATAL:database \"\/path\/to\/current\/project\/projectname\/databasename\" does not exist.\nI have accessed the database both manually through psql, as well as through pgadmin4, and have verified in both instances that the database does exist, and I have verified that the port is correct.\nIm not sure why I cant access the database, or why it would say the database cannot be found.\nAccording to pgAdmin4, the database is healthy, and it is receiving at least 1 I\/O per second, so it can be read and written to by...something?\nI have installed both the psycopg2 and the psycopg2-binary just to be safe.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":29,"Q_Id":55109206,"Users Score":0,"Answer":"I figured out the answer, or at least I do believe I did. It was a two part problem.\nPart of it was I left os.path.join(base_dir...) included as part of the '' name section.\nThe other was I used an \"@\" character as part of my password. Once I changed the password, and I removed the os.path.join(base_dir...) portion, it worked.","Q_Score":0,"Tags":"python,django,web","A_Id":55109207,"CreationDate":"2019-03-11T19:42:00.000","Title":"Having issues connecting to PostgreSQL Database in Django","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a requirement in which I need to automate the start and stop of the AWS EC2 Instances (within Autoscaling group) daily. This is mainly to prevent cost. I have built a Python script to start and stop EC2 instances but it's not working properly as EC2 instances are within an Autoscaling group.\nDoes anybody know any solution for this?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":409,"Q_Id":55130327,"Users Score":0,"Answer":"What you need to do is automate the auto scaling parameters, for desired instances, min instances and max instances. Ideally, you want to change the desired instance amount. This will cause the auto scaler to terminate excessive instances, to meet the desired instance amount.","Q_Score":0,"Tags":"python,amazon-web-services,autoscaling","A_Id":55130351,"CreationDate":"2019-03-12T20:41:00.000","Title":"Start and stop AWS EC2 instance","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I can't seem to find any resources that state whether or not some popular OGMs can be used with neptune instead of writing raw gremlin queries for example.\nWould any of you know what OGMs are supported or can be used with Neptune and which would you recommend for python in particular?\nAlso, would it be better to use an OGM (like goblin for example) or stick to the gremlin python GVL instead?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":225,"Q_Id":55137417,"Users Score":0,"Answer":"Goblin claims that its TP 3.2.4 compatible, but I don't see any mention of its plan to be in sync with newer TP versions. GLV's ensure that you always have a compatibility with any TP version that has been released. They need not work across versions (ie. GLV v3.2.4 might not work peacefully with a TP 3.3.0 server) but you be sure that there will be a GLV for each official release of TP. \nBarring that, I don't see any concerns using an OGM. Its a different paradigm at the end of the day and should not be a concern apart from the version compatibility that I called out before. I've not tried it in person, so do let me know how it goes! Good luck.","Q_Score":1,"Tags":"python,amazon-web-services,gremlin,amazon-neptune,goblin","A_Id":56302721,"CreationDate":"2019-03-13T08:34:00.000","Title":"Using an OGM with AWS Neptune","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"We have to refactor scraping algorithm. To speed it up we came up to conclusion to multi-thread processes (and limit them to max 3). Generally speaking scraping consists of following aspects:\n\nScraping (async request, takes approx 2 sec)\nImage processing  (async per image, approx 500ms per image)\nChanging source item in DB (async request, approx 2 sec)\n\nWhat I am aiming to do is to create batch of scraping requests and while looping through them, create a stack of consequent async operations: Process images and as soon as images are processed -> change source item.\nIn other words - scraping goes. but image processing and changing source items must be run in separate limited async threads.\nOnly think I don't know how to stack the batch and limit threads.\nHas anyone came across the same task and what approach have you used?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":61,"Q_Id":55138277,"Users Score":1,"Answer":"What you're looking for is consumer-producer pattern. Just create 3 different queues and when you process the item in one of them, queue new work in another. Then you can 3 different threads each of them processing one queue.","Q_Score":1,"Tags":"python,multithreading","A_Id":55138456,"CreationDate":"2019-03-13T09:24:00.000","Title":"Async, multithreaded scraping in Python with limited threads","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using the Scrapy (Scrapy==1.6.0) library with Python3. I am wondering, where in the code does Scrapy actually do the HTML request? I want to set a breakpoint there so I can see exactly what headers \/ cookies \/ urls \/ and user agent is actually being passed.\nAlso, where exactly is the response received as well? Right now my spider is failing to find any pages, so I imagine I'm getting either a blank HTML document or a 403 error, however I have no idea where to look to confirm this.\nCan anyone familiar with the scrapy library point me to exactly where in code I can check these parameters?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":41,"Q_Id":55148001,"Users Score":0,"Answer":"I believe you can check out scrapy\/core\/engine.py method _download.\nThough I'd suggest you make use of scrapy shell. It will let you execute particular request, inspect response, open response in browser to see what was received by Scrapy. Also with a bit more of tuning you can import your spider in your shell and call a particular method of your spider and put a breakpoint there.\nIf your spider fails to find any pages then the problem is likely to be with your spider, not the framework.","Q_Score":0,"Tags":"python,web-scraping,scrapy","A_Id":55148667,"CreationDate":"2019-03-13T17:31:00.000","Title":"Where does Scrapy actually do the html request?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Selenium to locate elements in a page. Is there any way to combine two methods together?\nExample:\nMethod 1: driver.find_elements_by_partial_link_text('html')\nMethod 2: driver.find_elements_by_class_name('iUh30')\nI will ideally like a method that finds elements that has both the partial link text and class name specified.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":469,"Q_Id":55159886,"Users Score":1,"Answer":"You can use xpath to combine both selectors:\ndriver.find_elements_by_xpath(\"\/\/*[@class='iUh30'][text()[contains(.,'html')]]\")\nThe \/\/* looks for any element with any tag. Might be <a>, might be <div>, <input>, anything. You can just change it to the desired tag.\nThe above find the element by exact class name. You can also use [contains(@class, 'partial_class')] to find elements by partial class.\nThe [text()[contains(.,'html')]] looks for elements which partial text is \"html\"","Q_Score":0,"Tags":"python-3.x,selenium-webdriver","A_Id":55160119,"CreationDate":"2019-03-14T10:14:00.000","Title":"Selenium locating elements by more than one method","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a script that uses tabula.read_pdf. Script works fine, however when I build an exe file with PyInstaller (with --noconsole option) and run my script - it opens java.exe empty console window which stays opened untill script work is done. \nHow can I avoid it?\nThanks","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":258,"Q_Id":55164352,"Users Score":0,"Answer":"I have managed to fix it by changing java to javaw in wrapper.py file. Thanks.","Q_Score":1,"Tags":"python,pyinstaller,tabula","A_Id":55179237,"CreationDate":"2019-03-14T13:55:00.000","Title":"Python tabula read_pdf opens java console window","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a script that uses tabula.read_pdf. Script works fine, however when I build an exe file with PyInstaller (with --noconsole option) and run my script - it opens java.exe empty console window which stays opened untill script work is done. \nHow can I avoid it?\nThanks","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":258,"Q_Id":55164352,"Users Score":1,"Answer":"I was running into a similar issue and couldn't really find the wrapper.py. After some tinkering around I found a similar workaround:\nWithin the directory where tabula is installed \"...\\Lib\\site-packages\\tabula\" edit the \"io.py\" file. In the \"_run\" function just change the \"args\" variable to use \"javaw\" instead of \"java\".\nI was able to hide the java console when my .exe file ran this way. I hope this helps someone in the future.","Q_Score":1,"Tags":"python,pyinstaller,tabula","A_Id":70838257,"CreationDate":"2019-03-14T13:55:00.000","Title":"Python tabula read_pdf opens java console window","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am new at this part of web developing and was trying to figure out a way of creating a web app with the basic specifications as the example bellow:\n\nA user1 opens a page with a textbox (something where he can add text or so), and it will be modified as it decides to do it.\n\nIf the user1 has problems he can invite other user2 to help with the typing.\n\n\nThe user2 (when logged to the Channel\/Socket) will be able to modify that field and the modifications made will be show to the user1 in real time and vice versa.\n\n\nOr another example is a room on CodeAcademy:\n\nImagine that I am learning a new coding language, however, at middle of it I jeopardize it and had to ask for help.\n\nSo I go forward and ask help to another user. This user access the page through a WebSocket (or something related to that).\n\n\nThe user helps me changing my code and adding some comments at it in real time, and I also will be able to ask questions through it (real time communication)\n\n\nMy questions is: will I be able to developed certain app using Django Channels 2 and multiplexing? or better move to use NodeJS or something related to that?\nObs: I do have more experience working with python\/django, so it will more productive for me right know if could find a way working with this combo.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":238,"Q_Id":55170669,"Users Score":1,"Answer":"This is definitely possible. They will be lots of possibilities, but I would recommend the following.\n\nHave a page with code on. The page has some websocket JS code that can connect to a Channels Consumer.\nThe JS does 2 simple things. When code is updated code on the screen, send a message to the Consumer, with the new text (you can optimize this later). When the socket receives a message, then replace the code on screen with the new code.\nIn your consumer, add your consumer to a channel group when connecting (the group will contain all of the consumers that are accessing the page)\nWhen a message is received, use group_send to send it to all the other consumers\nWhen your consumer callback function gets called, then send a message to your websocket","Q_Score":0,"Tags":"python,django,websocket,multiplexing","A_Id":55243910,"CreationDate":"2019-03-14T19:33:00.000","Title":"How does multiplexing in Django sockets work?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am looking to keep the browser window open even after test execution.\nI would like to keep it open indefinitely.\nAs of now , as a work around I am just using sleep() to keep the window from closing.\nAny help would be much appreciated. Thank you !","AnswerCount":3,"Available Count":1,"Score":0.2605204458,"is_accepted":false,"ViewCount":4086,"Q_Id":55186282,"Users Score":4,"Answer":"Simple - do not call Close Browser at the end.","Q_Score":3,"Tags":"python,selenium,selenium-webdriver,robotframework","A_Id":55197099,"CreationDate":"2019-03-15T15:49:00.000","Title":"Is there a way to keep the browser window open after the test execution in RobotFramework?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Context: I have an app that serves interactive graphs and data analysis. In order to calculate plots and data summaries, it uses a dataset that is loaded upon App initialization by querying google BigQuery. The data is then kept as a global variable (in memory) and is used in all data calculations and plots that might be run by different users (each user saves in their session their own filters\/mask). \nThis dataset changes in BigQuery once per day during the night (I know the exact datetime of refresh). Once the data is refreshed in BigQuery, I want the global variable of the dataset to be refreshed. \nI know that the proper solution would be to call a Database on each user request, but BigQuery high delay on requests doesn't make this a good solution, and I can't use another DB.\nThe only solution I've came across so far is to restart the Google App Engine service (all instances) after BigQuery data refresh. Please note that this should be a scheduled action, done programatically. \nMy questions:\n\nIn case restarting the service is the best possible solution, how should I be restarting the service?\nIn case there is another way to accomplish what I want, please let me know","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1633,"Q_Id":55203095,"Users Score":0,"Answer":"It's likely good practice to cache your dataset as you're doing; if you know the data hasn't changed. then there's no need to requery BigQuery for it.\nHowever, your dataset does change, just once per day.\nSo, I think your approach should be to revise your app so that it refreshes the cached copy of your BigQuery dataset every day and stop|block your users from querying the dataset as it changes.\nYou actually need only change the dataset if a user requests it (there's no need to refresh the dataset on days when no users need it), so, depending on the time the refresh takes and your users' expectations on latency, you could trigger the refresh by a user request: has the dataset changed? If so, block this request, refresh the data and then respond to the user.\nI assume you've already solved the problem that your users' data plots and calculations will differ for different datasets.","Q_Score":1,"Tags":"python-3.x,google-app-engine,google-api,gcloud","A_Id":55203379,"CreationDate":"2019-03-17T01:33:00.000","Title":"How to restart Google App Engine Standard Service","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"In Zapier, I have a \"Run Python\" action triggered by a \"Twitter\" event. One of the fields passed to me by the Twitter event is called \"Entities URLs Display URL\". It's the list of anchor texts of all of the links in the tweet being processed.\nZapier is passing this value into my Python code as a single comma-separated string. I know I can use .split(',') to get a list, but this results in ambiguity if the original strings contained commas.\nIs there some way to get Zapier to pass this sequence of strings into my code as a sequence of strings rather than as a single joined-together string?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":124,"Q_Id":55233255,"Users Score":2,"Answer":"David here, from the Zapier Platform team. \nAt this time, all inputs to a code step are coerced into strings due to the way data is passed between zap steps. This is a great request though and I'll make a note of it internally.","Q_Score":1,"Tags":"python,zapier","A_Id":55244199,"CreationDate":"2019-03-19T03:35:00.000","Title":"In Zapier, how do I get the inputs to my Python \"Run Code\" action to be passed in as lists and not joined strings?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a website which is built with django.\nProblem: we have >50 pages currently and exactly identical footer HTML code on each of those pages. I am getting tired of having to edit all those pages when adding a little change to the footer.\nPossible solution: inserting the footer directly in the django base page.\nPotential problems: if I insert the footer in the base page, all the individual JS scripts between the footer and the  tag would be lost - clearly those scripts are page specific. So could I have the specific JS scripts BEFORE the footer? This would allow the footer to go in the base nice and easily, but I'm not sure I can do this. Would moving the scripts before the footer be wrong?\nThanks","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":871,"Q_Id":55242452,"Users Score":0,"Answer":"You can put your footer HTML into its own file and then add the {% include 'footer.html' %} in the templates where you need the footer HTML to appear. That way in future you will only need to edit footer.html when you wish to change something in the footer.","Q_Score":0,"Tags":"javascript,python,html,django","A_Id":55242577,"CreationDate":"2019-03-19T13:41:00.000","Title":"Can I put JS scripts above footer instead of below footer before  tag","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm aware that there are potentially severe security implications to pickling\/unpickling. I was planning to use pickling as a way to store and transfer an object instance in a Django model using jsonpickle. I was also going to use a hash or signature to verify the integrity of the pickle prior to unpickling (i.e. send the hash, then send the pickle, whatever).\nSince my own code would be producing the pickled object, would this method be safe enough (relatively or absolutely), assuming any object in transit would be encrypted as well?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":129,"Q_Id":55248121,"Users Score":0,"Answer":"If you just pass JSON (encrypted because of, say, an https connection is used), you eliminate the arbitrary code execution risk inherent to pickle. And you can validate the data before using it. You just have to worry about accepting the data from someone (and that's about authentication) allowed to communicate with you.\nYou can customize the JSON serialization it it doesn't support the type you want.\nExchanging JSON is pretty common with REST API's for example.\nThis looks safe (I am not a security expert though) and much simpler.","Q_Score":0,"Tags":"python,python-3.x,pickle,jsonpickle","A_Id":55749171,"CreationDate":"2019-03-19T18:50:00.000","Title":"Scenario safe for pickling in Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm creating a web applcation in Python and I only want the user to be able to enter a weekday that is older than today's date. I've had a look at isoweekday() for example but don't know how to integrate it into a flask form. The form currently looks like this:\nappointment_date = DateField('Appointment Date', format='%Y-%m-%d', validators=[DataRequired()])\nThanks","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":126,"Q_Id":55258105,"Users Score":0,"Answer":"If you just want a weekday, you should put a select or a textbox, not a date picker.\nIf you put a select, you can disable the days before today so you don't even need a validation","Q_Score":0,"Tags":"python,forms,flask","A_Id":55258169,"CreationDate":"2019-03-20T10:03:00.000","Title":"How to only enter a date that is a weekday in Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Most of the tutorials and books about Django or Flask import specific classes from files instead of importing the whole file.\nFor example, importing DataRequiered validator from wrtforms.validators is done via from wtforms import validators instead of importing it via import wtforms.validators as valids and then accessing DataRequiered with valids.DataRequiered.\n\nMy question is: Is there an reason for this ?\n\nI thought to something like avoiding the loading a whole module for computation\/memory optimization (is it really relevant?) ? Or is it simply to make the code more readable ?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":63,"Q_Id":55260308,"Users Score":0,"Answer":"It depends, in the tutorial that was probably done for readability\nUsually if you use most of the classes in a file, you import the file. If the files contains many classes but you only need a few, just import those. \nIt's both a matter of readability and optimization.","Q_Score":1,"Tags":"python,import","A_Id":55260578,"CreationDate":"2019-03-20T12:01:00.000","Title":"Does importing specific class from file instead of full file matters?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a contanarized flask app with external db, that logs users on other site using selenium. Everything work perfectly in localhost. I want to deploy this app using containers and found selenium container with google chrome within could make the job. And my question is: how to execute scripts\/methods from flask container in selenium container? I tried to find some helpful info, but I didn't find anything. \nShould I make an API call from selenium container to flask container? Is it the way or maybe something different?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":115,"Q_Id":55299697,"Users Score":1,"Answer":"As far as i understood, you are trying to take your local implementation, which runs on your pc and put it into two different docker containers. Then you want to make a call from the selenium container to your container containing the flask script which connects to your database.\nIn this case, you can think of your containers like two different computers. You can tell docker do create an internal network between these two containers and send the request via API call, like you suggested. But you are not limited to this approach, you can use any technique, that works for two computers to exchange commands.","Q_Score":0,"Tags":"python,selenium,docker,flask,google-chrome-headless","A_Id":55302692,"CreationDate":"2019-03-22T12:32:00.000","Title":"How to execute script from container within another container?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using Jupyter notebooks with jupyter-contrib-nbextensions and I can fold sections as well as code blocks in them. I want to know if there is a way to preserve the folding feature when the notebook is exported to html.  Currently when I export to html, I can't fold anything. The notebook becomes cumbersome to handle if it's long, even if there's a table of contents. I'll appreciate any ideas in this regard. Thanks!","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":974,"Q_Id":55306404,"Users Score":2,"Answer":"Interesting need.  I briefly looked into this.  Looks like the nbextensions don't have that capability.  I think there are perhaps two choices, both of which would require quite some work:  \n\nTake the html file and convert it to some form that would allow cascading style sheets and then manually implement folding\nIf you are looking to do this repeatedly and have the skills, then you could look at the nbextensions code and try to change it to make it fold\n\nIf you find any other options or solutions, post it here.","Q_Score":2,"Tags":"python,jupyter-notebook,jupyter,folding,jupyter-contrib-nbextensions","A_Id":55306608,"CreationDate":"2019-03-22T19:14:00.000","Title":"Jupyter notebook: Is there a way to fold sections while exporting to html","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"How do you upload an image from your web to gcloud Storage?\n\nclient: React app\nserver: Python(Flask)\n\nCLIENT SIDE: I have a file browse component where I choose an image from the local drive. Then, I transform the image into a base64 string, and send it to the server.\nSERVER-SIDE: \nThen I upload the base64 image: blob.upload_from_string(base64data, type=\"image\/jpeg\")\nBut when I look inside my bucket I see a 1 black pixel image.\nQuestions\n\nCan I upload a base64 image right into my bucket?\nWhy does my image is being procced as a black pixel? where does it break?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1562,"Q_Id":55326249,"Users Score":1,"Answer":"In the end what i did was to remove the first part of the string data:image\/jpeg;base64,, (of course its not necessarily a jpeg.. its just an example).\nI decoded  the rest of the string back to an image, and passed the content_type also.\nThat solved my problem","Q_Score":2,"Tags":"python,base64,storage,gcloud","A_Id":55406473,"CreationDate":"2019-03-24T16:59:00.000","Title":"How to upload base64 image to GCloud Storage","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have some model where there are date field and CharField with choices New or Done, and I want to show some message for this model objects in my API views if  2 conditions are met, date is past and status is NEW, but I really don't know how I should resolve this.\nI was thinking that maybe there is option to make some field in model that have choices and set suitable choice if conditions are fulfilled but I didn't find any information if something like this is possible so maybe someone have idea how resolve this?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":32,"Q_Id":55326465,"Users Score":0,"Answer":"You need override the method save of your model. An overrided method must check the condition and show message\nYou may set the signal receiver on the post_save signal that does the same like (1).","Q_Score":0,"Tags":"python,django","A_Id":55328234,"CreationDate":"2019-03-24T17:23:00.000","Title":"Automatically filled field in model","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on a task where I need to web scrape boxofficemojo site.\nI coded everything and it is working perfectly fine in my local machine.\nThere are around 19000 urls that I need to scrape. As it is obviously a time consuming process, I don't want to run it on my local machine. Instead I want to run it on an aws ec2 instance.\nThe ec2 instance is Ubuntu 18.04. I have verified python versions and the libraries used in script are present or not and everything.\nHowever, if I try\nrequests.get('http:\/\/www.boxofficemojo.com') ,\nit is giving me 503 response. If I print the response text, it is saying We are in process of updating site right now.  But the same thing is working in my local machine.\nWhy am I getting this wierd behaviour in ec2 instance.\nI tried testing internet connection inside the ec2 instance by issuing ping command . It's working fine.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":101,"Q_Id":55328681,"Users Score":4,"Answer":"There are public sites, and public api's that specifically block calls from ec2 instances (and probably other cloud providers). \nIt's not impossible that some of the sites you are trying to scrape, simply blacklist ec2 instances ip ranges to cut down on the 'bots' that are eating up their resources ... I have come across this several times, for several sites.\nThe NBA stats api is one example I am familiar with, but I have come across others as well - the sites you are scraping may be some of them as well.","Q_Score":0,"Tags":"python,amazon-web-services,amazon-ec2,web-scraping,python-requests","A_Id":55328905,"CreationDate":"2019-03-24T21:19:00.000","Title":"Why am I getting different http responses from different locations?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on NLP project so I am using spacy, the problem is when I import nlp=spacy.load('fr_core_news_md'), it doesn't work for me and I get this error:\n\nOSError: [E050] Can't find model 'fr_core_news_md'. It doesn't seem to\nbe a shortcut link, a Python package or a valid path to a data\ndirectory.\"\n\nDespite the use of python -m spacy download fr_core_news_md","AnswerCount":4,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":7779,"Q_Id":55338972,"Users Score":0,"Answer":"first install the package then import it (but not vice versa)\nfirst : !python3 -m spacy download fr_core_news_md\nthen : nlp = spacy.load(\"fr_core_news_md\")","Q_Score":3,"Tags":"python,spacy","A_Id":72260042,"CreationDate":"2019-03-25T13:31:00.000","Title":"OSError: [E050] Can't find model 'fr_core_web_md'. It doesn't seem to be a shortcut link, a Python package or a valid path to a data directory","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on NLP project so I am using spacy, the problem is when I import nlp=spacy.load('fr_core_news_md'), it doesn't work for me and I get this error:\n\nOSError: [E050] Can't find model 'fr_core_news_md'. It doesn't seem to\nbe a shortcut link, a Python package or a valid path to a data\ndirectory.\"\n\nDespite the use of python -m spacy download fr_core_news_md","AnswerCount":4,"Available Count":2,"Score":0.049958375,"is_accepted":false,"ViewCount":7779,"Q_Id":55338972,"Users Score":1,"Answer":"It is worth mentioning the bug I had recently.\n\nI installed the fr_core_news_md, and then I tried to load the fr_core_news_sm.\n\nIt was around 2:00 AM I wasn't able to find it.\nI slept and came back in the morning and found the solution.","Q_Score":3,"Tags":"python,spacy","A_Id":69374319,"CreationDate":"2019-03-25T13:31:00.000","Title":"OSError: [E050] Can't find model 'fr_core_web_md'. It doesn't seem to be a shortcut link, a Python package or a valid path to a data directory","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to use BeautifulSoup method inside my module method. If I import as from BeautifulSoup import BeautifulSoup that is working in while running python through CMD\n   How can I import BeautifulSoup3 library that I installed in python 2.7 into my OpenERP module.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":36,"Q_Id":55341833,"Users Score":0,"Answer":"Just copy and paste the BeautifullSoup.py file from python27\\Lib\\site-packages\\BeautifullSoup.py into the folder path openERP7>Server>server and it will do the trick.","Q_Score":1,"Tags":"python-2.7,beautifulsoup,openerp-7","A_Id":55350713,"CreationDate":"2019-03-25T16:00:00.000","Title":"How to import BeautifulSoup into a python method OpenERP 7 module","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I\u2019m looking into web scraping \/crawling possibilities and have been reading up on the Scrapy program. I was wondering if anyone knows if it\u2019s possible to input instructions into the script so that once it\u2019s visited the url it can then choose pre-selected dates from a calendar on the website. ?\nEnd result is for this to be used for price comparisons on sites such as Trivago. I\u2019m hoping I can get the program to select certain criteria such as dates once on the website like a human would.\nThanks,\nAlex","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":66,"Q_Id":55361023,"Users Score":2,"Answer":"In theory for a website like Trivago you can use the URL to set the dates you want to query but you will need to research user agents and proxies because otherwise your IP will get blacklisted really fast.","Q_Score":1,"Tags":"python,scrapy,web-crawler,data-extraction","A_Id":55368161,"CreationDate":"2019-03-26T15:37:00.000","Title":"Scrapy and possibilities available","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have been trying to successfully create projects using Django however I have seen projects where the user will create the project first THEN the virtual env. I have also seen instances where the user creates the virtual env and THEN the django app. Both sides argue that their method is better, but now I am confused. Pls help","AnswerCount":3,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":220,"Q_Id":55368323,"Users Score":1,"Answer":"it is better to create the virtual environment first and start working in that environment. ie use python from that environment.\nadvantage: \na. environment will contain all the package required by the project\nb. can switch between multiple env( testing purpose)\nc. easy to keep a record of the required packages\nd. will not affect another project where u need python 3.5 and in django project u require python 3.6\ndisadvantage:\n   need to keep track of each env in case if you have many virtual env ( all virtual env are store in same place just like anaconda one, else if store in project folder then no issue for1 env)","Q_Score":1,"Tags":"python,django,virtualenv,python-venv","A_Id":55368421,"CreationDate":"2019-03-27T01:04:00.000","Title":"Create the Django app or the virtual environment first?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have been trying to successfully create projects using Django however I have seen projects where the user will create the project first THEN the virtual env. I have also seen instances where the user creates the virtual env and THEN the django app. Both sides argue that their method is better, but now I am confused. Pls help","AnswerCount":3,"Available Count":2,"Score":0.0665680765,"is_accepted":false,"ViewCount":220,"Q_Id":55368323,"Users Score":1,"Answer":"It depends on your usage.\nLet's say you have Django 2.1 installed globally, then you have a project where you need let's say Django 1.9, here you need to set-up your virtual environment first","Q_Score":1,"Tags":"python,django,virtualenv,python-venv","A_Id":55368370,"CreationDate":"2019-03-27T01:04:00.000","Title":"Create the Django app or the virtual environment first?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a python code which I want to deploy on firebase as my Application  database is firebase realtimeDB.\nA part of this APP is developed on python so I want to integrate in with my App. Which can be done by deploying python piece of code on firebase.\nI am unable to find a way to deploy a python code via firebase hosting.\nAnyone have any solution I would really appreciate it.\nI have tried to deploy it with firebase CLI tools. But I think it supports Javascript","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":1824,"Q_Id":55369357,"Users Score":1,"Answer":"You can't deploy any backend code with Firebase Hosting.  It only serves static content.  You will have to look into other ways of running your backend, such as Cloud Functions or App Engine.","Q_Score":0,"Tags":"python,firebase,firebase-hosting","A_Id":55369376,"CreationDate":"2019-03-27T03:31:00.000","Title":"How to deploy a python code on firebase server","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I just built a little web application with flask and I want to manage users roles and accessibility to the endpoint according to their role etc and for that, I want to use something like acl (Access Control List) but I can't find anything useful or clear enough to understand.\nI found flask-acl but the documentation is so poor, I found flask-simpleacl but I can't put my hands on any useful documentation.\nI can't even find tutorials or examples about so can someone suggest a good useful flask extension or library for that or just point me to some documentation, examples or tutorials?\nThanks.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":655,"Q_Id":55398895,"Users Score":1,"Answer":"I ended up trying to use flask_principal as someone suggested to me here (but for some reason, they deleted their answer), it's great and helpful especially if you combine it with flask_login. So I hope this helps someone.\nThe only issue is if you want for example show\/hide some content on your HTML pages based on the user's role, then you have to set it manually with session variables which is mostly going back to the start point (unless I'm missing something).\nGood luck.","Q_Score":0,"Tags":"python,flask,acl","A_Id":55452208,"CreationDate":"2019-03-28T13:31:00.000","Title":"Implementing ACL with flask","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I made some changes in my source code. But after I restart the server, Iam not able to see those changes. I'm using Django framework. How do I recompile python code in the linux (CentOS) server. \nI already tried restarting the server, installing django-extension.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":138,"Q_Id":55414837,"Users Score":0,"Answer":"Try using a different port if its on your local machine","Q_Score":0,"Tags":"python,django,linux,server","A_Id":55416528,"CreationDate":"2019-03-29T09:59:00.000","Title":"How do I recompile the python files","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I just started studying flask and built a toy website to see how well I am doing. I have a flask website built in python 3.6 and I have tested it on my windows computer and everything goes very well. Now I want to host the website on an ubuntu ec2 instance. But first, I am testing if everything runs well on my ec2 instance and am stuck at trying to access port 5000 on my ec2 instance My app is currently serving on port 127.0.0.1:5000 of my linux server. I have tried to connect to my.ec2.public.ip:5000 and my.ec2.private.ip:5000 with no success. Could someone help me? Thanks.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":287,"Q_Id":55426401,"Users Score":0,"Answer":"By default a new AWS instance would not allow port 5000 to be accessed, so you will need to modify the security group to allow access on that port. You do this thru the AWS console.","Q_Score":0,"Tags":"amazon-ec2,python-3.6,flask-sqlalchemy,ubuntu-18.04","A_Id":55426431,"CreationDate":"2019-03-29T22:51:00.000","Title":"How do I access 127:.0.0.1:5000 on Ubuntu Server 16.04 LTS (HVM), SSD Volume Type","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have been trying to make Flask render two templates at once so that one template can play some video, and the other template, which will be next to it, stream some type of content, meaning it updates every few seconds. When I had only one template, I was able to update it, but the problem was even the video kept restarting. How can I fix this problem? If my two template concept is flawed and impossible, is it possible to get the same results with something else such as reloading only specific divs in the web page. \nNote: This is all on one page.\nThanks.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":218,"Q_Id":55435211,"Users Score":0,"Answer":"Flask only renders 1 template. Yes, you could use iframes to reload only some parts of your website but they are considered a bad practice. Probably the best option is to use AJAX to pool the server for updates periodicaly without reloading the page. You could use jQuery to do it manualy or find some front-end library to make your life easier.","Q_Score":0,"Tags":"python,python-3.x,flask","A_Id":55435285,"CreationDate":"2019-03-30T19:58:00.000","Title":"How to render two html files separately in Flask?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"The requirement is that I have to trigger a SageMaker endpoint on lambda to get predictions(which is easy) but have to do some extra processing for variable importance using packages such as XGBoost and SHAP.\nI am able to hit the endpoint and get variable importance using the SageMaker Jupyter notebook. Now, I want to replicate the same thing on AWS lambda.\n1) How to run python code on AWS lambda with package dependencies for Pandas, XGBoost and SHAP (total package size greater than 500MB). The unzipped deployment package size is greater than 250 MB, hence lambda is not allowing to deploy. I even tried using lambda function from Cloud9 and got the same error due to size restrictions. I have also tried lambda layers, but no luck.\n2) Is there a way for me to run the code with such big packages on or through lambda bypassing the deployment package size limitation of 250 MB\n3) Is there a way to trigger a SageMaker notebook execution through lambda which would do the calculations and return the output back to lambda?","AnswerCount":4,"Available Count":1,"Score":0.049958375,"is_accepted":false,"ViewCount":1517,"Q_Id":55463916,"Users Score":1,"Answer":"I found the 250MB limitation on AWS lambda size to be draconian. Only one file ibxgboost.so from xgboost package is already around 140 MB which leaves only 110Mb for everything else. That makes AWS lambdas useless for anything but simple \"hello world\" stuff.\n As an ugly workaround you can store xgboost package somewhere on s3 an copy it to the \/tmp folder from the lambda invocation routine and point your python path to it. The allowed tmp space is a bit higher - 500MB so it might work. \nI am not sure though if the \/tmp folder is not cleaned between the lambda function runs though.","Q_Score":6,"Tags":"python,amazon-web-services,aws-lambda,xgboost,amazon-sagemaker","A_Id":58662399,"CreationDate":"2019-04-01T21:36:00.000","Title":"How to run python code on AWS lambda with package dependencies >500MB?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm woriking on a project that checks if LEDSTATUS from a database has the value \"0\" then led is off, if the value is \"1\" led is on.\nI searched and found out that there is something called UDF that can run scripts but am not sure if it is possible if the database is not local (on a server).\nis it possible? if yes how?\nI created two python scripts one that turn led on and the other one to turns it off. \nI will create a database with one table LEDSTATUS and will create a trigger that will run when ever the value of LEDSTATUS gets changed, if the value is 0 then run python script that turn led off, and if the value is 1 run the other script.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":437,"Q_Id":55482634,"Users Score":0,"Answer":"Database triggers are for DELETE, INSERT, UPDATE sql queries. You cannot trigger a python script with it.\nAt some point you set the database field to 0 or to 1 with an UPDATE SQL query.\nThe event based approach is to run the according python script before or after you performed the sql update query. Python could run as a webserver on the pi and you can send values via GET or POST.   \nThe polling approach is to query the database every x (mili)second with a python script or similar and execute turn on\/off functions accordingly.","Q_Score":0,"Tags":"python,mysql,raspberry-pi3,user-defined-functions","A_Id":55484111,"CreationDate":"2019-04-02T19:58:00.000","Title":"Can i run a python script on my raspberry pi when a trigger is triggered in Mysql database server?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working on a twisted web application which uploads files and encrypts them, returning the url+key to the user.\nI've been tasked with scaling this application. At the moment when there are more than 3-4 concurrent upload requests the performance will drop off significantly.\nI'm no Twisted expert but I assume this is due to it running in a single python process, being a high cpu application and the GIL?\nHow could I go about scaling this?\nIf this was a different framework such as Flask I would just put uwsgi in front of it and scale the number of processes. Would something similar work for Twisted and if so what tools are generally used for this?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":259,"Q_Id":55483727,"Users Score":0,"Answer":"If you think you could throw uwsgi in front of the application, I suppose it is pretty close to shared-nothing.  So you can run multiple instances of the program and gain a core's worth of performance from each.\nThere are a couple really obvious options for exactly how to run the multiple instances.  You could have a load balancer in front.  You could have the processes share a listening port.  There are probably more possibilities, too.\nSince your protocol seems to be HTTP, any old HTTP load balancer should be applicable.  It needn't be Twisted or Python based itself (though certainly it could be).\nIf you'd rather share a listening port, Twisted has APIs for passing file descriptors between processes (IReactorSocket) and for launching new processes that inherit a file descriptor from the parent (IReactorProcess).","Q_Score":1,"Tags":"python,twisted,scaling","A_Id":55485152,"CreationDate":"2019-04-02T21:19:00.000","Title":"How to scale a CPU bound Twisted application?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have to access the data in google clound bucket to my VM instance (jupyter notebook). I got this error and also getting problems related to this.\nERROR: Python 3 and later is not compatible with the Google Cloud SDK. Please use Python version 2.7.x.\nIf you have a compatible Python interpreter installed, you can use it by setting\nthe CLOUDSDK_PYTHON environment variable to point to it.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":74,"Q_Id":55490289,"Users Score":1,"Answer":"The Google cloud SDK is not compatible with Python3 for now. You will have to default to a better version as such 2.7.9 or later to work with the SDK.","Q_Score":0,"Tags":"python,google-cloud-platform,jupyter-notebook","A_Id":55490697,"CreationDate":"2019-04-03T08:18:00.000","Title":"Google cloud Bucket access","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I use ...\\pserve development.ini --reload in my dev environment to restart my API when code change.\nThe doc says:\n\nAuto-template-reload behavior is not recommended for production sites\n  as it slows rendering slightly; it\u2019s usually only desirable during\n  development.\n\nBut the doc has no proposition for a production environment. What's the recommendation to reload, do I have to make it manually every time?","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":167,"Q_Id":55495879,"Users Score":2,"Answer":"Yes, you will need to restart the service if you change anything in your config file.\nIf you know that you'll be changing things and don't want to restart it every time that happens, move some of your configs to a database and refactor your app to read from that. This won't be possible for everything, and you'll need to be careful that when an update happens it is applied correctly, but it can be done for some things.","Q_Score":1,"Tags":"python,pyramid","A_Id":55496324,"CreationDate":"2019-04-03T13:01:00.000","Title":"Deploy\/Reload code from python pyramid project in production","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Python script which communicates with a Financial site through an API. I also have a Django site, i would like to create a basic form on my site where i input something and, according to that input, my Python script should perform some operations. \nHow can i do this? I'm not asking for any code, i just would like to understand how to accomplish this. How can i \"run\" a python script on a Django project? Should i make my Django project communicate with the script through a post request? Or is there a simpler way?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1367,"Q_Id":55501346,"Users Score":0,"Answer":"I agree with @Daniel Roseman\nIf you are looking for your program to be faster, maybe multi-threading would be useful.","Q_Score":1,"Tags":"python,django","A_Id":55501698,"CreationDate":"2019-04-03T17:51:00.000","Title":"Running an external Python script on a Django site","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Python script which communicates with a Financial site through an API. I also have a Django site, i would like to create a basic form on my site where i input something and, according to that input, my Python script should perform some operations. \nHow can i do this? I'm not asking for any code, i just would like to understand how to accomplish this. How can i \"run\" a python script on a Django project? Should i make my Django project communicate with the script through a post request? Or is there a simpler way?","AnswerCount":2,"Available Count":2,"Score":0.1973753202,"is_accepted":false,"ViewCount":1367,"Q_Id":55501346,"Users Score":2,"Answer":"Since you don't want code, and you didn't get detailed on everything required required, here's my suggestion:\n\nMake sure your admin.py file has editable fields for the model you're using.\nMake an admin action,\nTake the selected row with the values you entered, and run that action with the data you entered.\n\nI would be more descriptive, but I'd need more details to do so.","Q_Score":1,"Tags":"python,django","A_Id":55501726,"CreationDate":"2019-04-03T17:51:00.000","Title":"Running an external Python script on a Django site","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using ubuntu 16 version and running Odoo erp system 12.0 version.\nOn my application log file i see information says \"virtual real time limit (178\/120s) reached\".\nWhat exactly it means & what damage it can cause to my application?\nAlso how i can increase the virtual real time limit?","AnswerCount":2,"Available Count":1,"Score":0.4621171573,"is_accepted":false,"ViewCount":10514,"Q_Id":55510726,"Users Score":5,"Answer":"Open your config file and just add below parameter :\n--limit-time-real=100000","Q_Score":9,"Tags":"python,ubuntu,odoo","A_Id":59282499,"CreationDate":"2019-04-04T07:59:00.000","Title":"virtual real time limit (178\/120s) reached","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I currently have a program that does work on a large set of data, at one point in the process it sends the data to a server for more work to be done, then my program looks for the completed data periodically, sleeping if it is not ready and repeating until it fetches the data, then continuing to do work locally.\nInstead of polling repeatedly until the external server has finished, it has the ability to send a simple http post to an address I designate once the work has finished. \nSo I assume I need flask running at an address that can receive the notification, but I'm unsure of the best way to incorporate flask into the original program. I am thinking just to split my program into 2 parts. \npart1.py\ndoes work --> send to external server\npart1 ends\nflask server.py\nreceives data --> spawns part2.py with received data \nThe original program uses multiprocessing pools to offset waiting for the server responses, but with using flask, can I just repeatedly spawn new instances of part2 to do work on the data as it is received?\nAm I doing this all completely wrong, I've just put this together with some googling and feel out of my depth","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":41,"Q_Id":55511836,"Users Score":0,"Answer":"U can use broker with a message queue implemented ex. Celery + Redis or RabbitMQ. Then, when the other server finishes doing whatever it has to do with the data it can produce an event, and the first server will receive a notification.","Q_Score":0,"Tags":"python,asynchronous,flask","A_Id":55511889,"CreationDate":"2019-04-04T08:59:00.000","Title":"What is the proper way to have an asychronous python script wait for a response from a server?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"In a machine-oriented deployment, usually, people would use gunicorn to spin up a number of workers to serve incoming requests. (yes, the worker_class would further define the behavior within the worker process)\nWhen deploying in a Kubernetes cluster, do we still gunicorn (or to be exact, do we still need multiprocess deployment)?\nBasically, each running container is a process (in the one-container-per-pod config). Multiple pods running behind a service is already equivalent to what gunicorn has to offer. In other words, rely on Kubernetes service instead of gunicorn\nIs gunicorn still needed?\nYes, a pod is not exactly the same as a process (some overhead in each pod for the companion container), but other than that, anything else we may miss from not having gunicorn?\nEdited\nClarification: yes, still need gunicorn or other wsgi http server to run the python app. My question is really about the multiprocess aspect (as the multiprocess\/gunicor in the title).","AnswerCount":4,"Available Count":2,"Score":0.049958375,"is_accepted":false,"ViewCount":6076,"Q_Id":55524904,"Users Score":1,"Answer":"It really depends on your use-cases. There is no right on wrong here if one solution suits you better than the other.\nWe have a similar use-case.\nWe are running about 30 replica's of the same service. Each pod runs 1 container, which again runs 50 duplicate services.\nWe could have ended up with 1500 pods running one service, but we've tested that the performance vs. required resources was much better when running only 30 replicas, which runs 50 services per replica.\nThe only thing we are doing extra is monitoring those 50 services per pod, so if one of them stops, it's being restarted. If all of them have some error, we run a healthcheck on the pod, and the pod is recreated.","Q_Score":17,"Tags":"kubernetes,multiprocessing,gunicorn,python-multiprocessing","A_Id":67640118,"CreationDate":"2019-04-04T21:06:00.000","Title":"In Kubernetes, do we still need multiprocess\/gunicorn?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"In a machine-oriented deployment, usually, people would use gunicorn to spin up a number of workers to serve incoming requests. (yes, the worker_class would further define the behavior within the worker process)\nWhen deploying in a Kubernetes cluster, do we still gunicorn (or to be exact, do we still need multiprocess deployment)?\nBasically, each running container is a process (in the one-container-per-pod config). Multiple pods running behind a service is already equivalent to what gunicorn has to offer. In other words, rely on Kubernetes service instead of gunicorn\nIs gunicorn still needed?\nYes, a pod is not exactly the same as a process (some overhead in each pod for the companion container), but other than that, anything else we may miss from not having gunicorn?\nEdited\nClarification: yes, still need gunicorn or other wsgi http server to run the python app. My question is really about the multiprocess aspect (as the multiprocess\/gunicor in the title).","AnswerCount":4,"Available Count":2,"Score":0.2449186624,"is_accepted":false,"ViewCount":6076,"Q_Id":55524904,"Users Score":5,"Answer":"Gunicorn is used to serve WSGI(Web Server Gateway Interface) applications so it is a server and not just multiprocess orchestration tool. Kubernetes on the hand is an orchestration tool that helps manage the infrastucture. It does not speak HTTP nor does it know anything about WSGI specs. \nIn other words, you can't run WSGI applications on bare kubernetes pods, you will still need a WSGI server liike Gunicorn, uWSGI, etc to serve the application.","Q_Score":17,"Tags":"kubernetes,multiprocessing,gunicorn,python-multiprocessing","A_Id":55525082,"CreationDate":"2019-04-04T21:06:00.000","Title":"In Kubernetes, do we still need multiprocess\/gunicorn?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I want to convert s3 bucket video file resolutions to other resolutions and store it back to s3.\nI know we can use ffmpeg locally to change the resolution.\nCan we use ffmpeg to convert s3 files and store it back using Django?\nI am puzzled as from where to start and what should be the process.\nWhether I should have the video file from s3 bucket in buffer and then convert it using ffmpeg and then upload it back to s3.\nOr is there anyway to do it directly without having to keep it in buffer.","AnswerCount":1,"Available Count":1,"Score":0.537049567,"is_accepted":false,"ViewCount":783,"Q_Id":55532567,"Users Score":3,"Answer":"You can break the problem into 3 parts:\n\nGet the file from s3: use boto3 & the AWS APIs to download the file\nConvert the file locally: ffmpeg has got you covered here. It'll generate a new file\nUpload the file back to s3: use boto3 again\n\nThis is fairly simple and robust for a script. \nNow if you want to optimize you can try using something like s3fs to mount your s3 bucket to local & do the conversion","Q_Score":0,"Tags":"python,django,amazon-s3,ffmpeg,django-rest-framework","A_Id":55532637,"CreationDate":"2019-04-05T09:45:00.000","Title":"Convert s3 video files resolution and store it back to s3","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"For the past several days, I have been trying to get the following to work in regards to building an APK from a Python application: 1. Briefcase, 2. P4A, 3. Buildozer, 4. Chaquopy.\nYet with hardly any luck, I've only gotten as far on all of them to tell me I've installed Java incorrectly. I've tried installation in a variety of different ways and to no avail. \nDoes anyone have any suggestions as to what to use to package my Python code into an APK? All the tools I've used so far are obsolete or have limited and varying documentation.","AnswerCount":1,"Available Count":1,"Score":-0.1973753202,"is_accepted":false,"ViewCount":33,"Q_Id":55545682,"Users Score":-1,"Answer":"The tools you list are the best ones currently available, and none of them are obsolete. If you need help using one of them, you should ask a question giving details of exactly what happened, either here on StackOverflow, or on the project's issue tracker.","Q_Score":0,"Tags":"android,python,android-studio,apk","A_Id":55589845,"CreationDate":"2019-04-06T03:41:00.000","Title":"Updated Software for Python APKs","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I recent upgraded web2py and starting using username=True, the form returned via auth\/profile no longer contains the user email address.\nHow can a user change email address under the standard api?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":93,"Q_Id":55547054,"Users Score":1,"Answer":"With or without username=True, the email address is not editable via the current Auth API (this was changed about a year ago, presumably for security reasons). For now, you'll have to implement your own email change functionality. For extra security, you might want to require password verification, and maybe send a verification email to the new address (and possibly a notification to the old address upon completion of the change).","Q_Score":1,"Tags":"python,web2py","A_Id":55550260,"CreationDate":"2019-04-06T08:00:00.000","Title":"How to change email address of user in web2py using standard auth api with username=True","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I often encounter elements which I cannot right click to inspect their xpath or css. \nI want to ask what other ways exist to click on those elements ?","AnswerCount":4,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":1061,"Q_Id":55556644,"Users Score":0,"Answer":"Control + Shift + C or F12 will open the dev tools for you, you can then click on the cursor mode on your browser.","Q_Score":1,"Tags":"python,selenium,google-chrome,xpath,google-chrome-devtools","A_Id":55558250,"CreationDate":"2019-04-07T07:32:00.000","Title":"How to interact with elements those cannot be inspected through css\/xpath within google-chrome-devtools","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I often encounter elements which I cannot right click to inspect their xpath or css. \nI want to ask what other ways exist to click on those elements ?","AnswerCount":4,"Available Count":3,"Score":0.049958375,"is_accepted":false,"ViewCount":1061,"Q_Id":55556644,"Users Score":1,"Answer":"You can use Ctrl + Shift + C, it will open the devtools with selecting an element to inspect enabled. Just move the mouse cursor to the element and click, it will scroll the html view in devtools to the correct place.\nAlternatively, you can press F12 and toggle the selecting an element to inspect button (top left corner of the devtools).","Q_Score":1,"Tags":"python,selenium,google-chrome,xpath,google-chrome-devtools","A_Id":55558180,"CreationDate":"2019-04-07T07:32:00.000","Title":"How to interact with elements those cannot be inspected through css\/xpath within google-chrome-devtools","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I often encounter elements which I cannot right click to inspect their xpath or css. \nI want to ask what other ways exist to click on those elements ?","AnswerCount":4,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":1061,"Q_Id":55556644,"Users Score":0,"Answer":"If you want to get elements locator but the right click doesn't work then try the following. \nFirst, Open the dev tools window by pressing Ctrl+Shift+I. \nIf that doesn't work then first open the dev tool then load the page.   \nAfter opening the dev tools click on \"select element\" tool, the printer icon at the left of the dev tool. You can directly get this tool by pressing Ctrl+Shift+C.\nThen hover on the element that you want to get the locator. The element will be selected in the DOM in the elements tab. Right click on the elements in the DOM. \nThen from the context menu go to copy -> copy selector for CSS selector or copy XPath for XPath. \nNow you have got the locator of that element in the clipboard.","Q_Score":1,"Tags":"python,selenium,google-chrome,xpath,google-chrome-devtools","A_Id":55556724,"CreationDate":"2019-04-07T07:32:00.000","Title":"How to interact with elements those cannot be inspected through css\/xpath within google-chrome-devtools","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"please, how do I display the month in the form? example:\n07\/04\/2019 i want to change it in 07 april, 2019 \nThank you in advance","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":77,"Q_Id":55556852,"Users Score":2,"Answer":"Try with following steps:\n\nGo to Translations > Languages\nOpen record with your current language.\nEdit date format with %d %A, %Y","Q_Score":1,"Tags":"python,odoo","A_Id":55556884,"CreationDate":"2019-04-07T08:00:00.000","Title":"how to display the month in from view ? (Odoo11)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"using pip I installed new version of HtmlTestRunner in python 3.6, but while I run python file through command prompt its throws error. \n\nTraceback (most recent call last):\n    File \"seleniumUnitTest.py\", line 3, in \n      import HtmlTestRunner\n  ModuleNotFoundError: No module named 'HtmlTestRunner'","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":1410,"Q_Id":55565407,"Users Score":2,"Answer":"Using python program.py instead of python3 program.py fixed my problem in Windows 10.","Q_Score":2,"Tags":"python,python-3.x,selenium,selenium-webdriver","A_Id":65629114,"CreationDate":"2019-04-08T02:11:00.000","Title":"Already installed Html test runner but it shows error \"ModuleNotFoundError: No module named 'HtmlTestRunner' \"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"As a project grows, so do dependencies and event chains, especially in overridden save() methods and post_save and pre_save signals. \nExample:\nAn overridden A.save creates two related objects to A - B and C. When C is saved, the post_save signal is invoked that does something else, etc...\nHow can these event chins be made more clear? Is there a way to visualize (generate automatically) such chains\/flows? I'm not looking for ERD nor a Class diagram. I need to be sure that doing one thing one place won't affect something on the other side of the project, so simple visualization would be the best.\nEDIT\nTo be clear, I know that it would be almost impossible to check dynamically generated signals. I just want to check all (not dynamically generated) post_save, pre_save, and overridden save methods and visualize them so I can see immediately what is happening and where when I save something.","AnswerCount":5,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":1398,"Q_Id":55578230,"Users Score":6,"Answer":"(Too long to fit into a comment, lacking code to be a complete answer) \nI can't mock up a ton of code right now, but another interesting solution, inspired by Mario Orlandi's comment above, would be some sort of script that scans the whole project and searches for any overridden save methods and pre and post save signals, tracking the class\/object that creates them. It could be as simple as a series of regex expressions that look for class definitions followed by any overridden save methods inside.  \nOnce you have scanned everything, you could use this collection of references to create a dependency tree (or set of trees) based on the class name and  then topologically sort each one. Any connected components would illustrate the dependencies, and you could visualize or search these trees to see the dependencies in a very easy, natural way. I am relatively naive in django, but it seems you could statically track dependencies this way, unless it is common for these methods to be overridden in multiple places at different times.","Q_Score":20,"Tags":"python,django,architecture,software-design","A_Id":55660187,"CreationDate":"2019-04-08T16:54:00.000","Title":"Django - how to visualize signals and save overrides?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Python Flask application with a HTML form which accept few inputs from user, uses those in an python program which returns the processed values back to flask application return statement.\nI wanted to capture the time took for whole processing and rendering output data on browser but not sure how to do that. At present I have captured the take by python program to process the input values but it doesn't account for complete time between \"submit\" action and rendering output data.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":77,"Q_Id":55587410,"Users Score":0,"Answer":"Use ajax request to submit form. Fetch the time on clicking the button and after getting the response and then calculate the difference.","Q_Score":0,"Tags":"python,html,python-3.x,flask,flask-wtforms","A_Id":55587577,"CreationDate":"2019-04-09T07:36:00.000","Title":"Capturing time between HTML form submit action and printing response","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using openapi-generator to generate server stub python code.\nEverything works fine, however, every time I make a change in the OpenAPI specs (the yaml file), the code generator overwrites the whole code, even the one customized (the controller). I would like to develop an incremental workflow, where if I make a change in the specs, the generator modifies the code handling that part of the code only. \nIt would be great if I get to the point where I can enforce the specs and also have an incremental workflow.\nI am using openapi-generator version 3.3.4. \nI tried to modify the controller and remove # noqa: E501, but it still overwrites the code every time I generate the stub from the specs.\nHow can I isolate the controller implementation by the generated interface, since the generated code is not OOP?","AnswerCount":4,"Available Count":4,"Score":0.0,"is_accepted":false,"ViewCount":678,"Q_Id":55596358,"Users Score":0,"Answer":"I tried to modify the controller and remove # noqa: E501, but it still overwrites the code every time I generate the stub from the specs.\n\nYou may want to use customized templates with the -t option.","Q_Score":1,"Tags":"python,flask-sqlalchemy,openapi,openapi-generator,connexion","A_Id":58424189,"CreationDate":"2019-04-09T15:29:00.000","Title":"openapi code generator - python server stub workflow","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using openapi-generator to generate server stub python code.\nEverything works fine, however, every time I make a change in the OpenAPI specs (the yaml file), the code generator overwrites the whole code, even the one customized (the controller). I would like to develop an incremental workflow, where if I make a change in the specs, the generator modifies the code handling that part of the code only. \nIt would be great if I get to the point where I can enforce the specs and also have an incremental workflow.\nI am using openapi-generator version 3.3.4. \nI tried to modify the controller and remove # noqa: E501, but it still overwrites the code every time I generate the stub from the specs.\nHow can I isolate the controller implementation by the generated interface, since the generated code is not OOP?","AnswerCount":4,"Available Count":4,"Score":0.0,"is_accepted":false,"ViewCount":678,"Q_Id":55596358,"Users Score":0,"Answer":"An easy workaround is to add openapi_server\/controllers in the .openapi-generator-ignore file so that they are not overwritten every time you update your API contract.\nYou'll have to manually create these files yourself though","Q_Score":1,"Tags":"python,flask-sqlalchemy,openapi,openapi-generator,connexion","A_Id":58417951,"CreationDate":"2019-04-09T15:29:00.000","Title":"openapi code generator - python server stub workflow","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using openapi-generator to generate server stub python code.\nEverything works fine, however, every time I make a change in the OpenAPI specs (the yaml file), the code generator overwrites the whole code, even the one customized (the controller). I would like to develop an incremental workflow, where if I make a change in the specs, the generator modifies the code handling that part of the code only. \nIt would be great if I get to the point where I can enforce the specs and also have an incremental workflow.\nI am using openapi-generator version 3.3.4. \nI tried to modify the controller and remove # noqa: E501, but it still overwrites the code every time I generate the stub from the specs.\nHow can I isolate the controller implementation by the generated interface, since the generated code is not OOP?","AnswerCount":4,"Available Count":4,"Score":0.0996679946,"is_accepted":false,"ViewCount":678,"Q_Id":55596358,"Users Score":2,"Answer":"To over come this problem I put my end point implementations into files in a openapi_server\/implementation\/ module and then I implemented a patching system in my build process.\nI generate the server stub and then apply a patch to the server endpoint stubs in openapi_server\/controller.\nThe patch includes adding various imports to endpoint implementation functions, replaces the  return 'do some magic!' lines with a calls to their end point implementations and even removes the # noqa: E501 comments where I don't want them.\nWith this system in place my openapi-generator can overwrite the openapi_server\/controller directory each time it runs, and in the end I still end up with these files in a state that calls the implementations I need and any other tweaks I wanted have been applied.","Q_Score":1,"Tags":"python,flask-sqlalchemy,openapi,openapi-generator,connexion","A_Id":68029246,"CreationDate":"2019-04-09T15:29:00.000","Title":"openapi code generator - python server stub workflow","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using openapi-generator to generate server stub python code.\nEverything works fine, however, every time I make a change in the OpenAPI specs (the yaml file), the code generator overwrites the whole code, even the one customized (the controller). I would like to develop an incremental workflow, where if I make a change in the specs, the generator modifies the code handling that part of the code only. \nIt would be great if I get to the point where I can enforce the specs and also have an incremental workflow.\nI am using openapi-generator version 3.3.4. \nI tried to modify the controller and remove # noqa: E501, but it still overwrites the code every time I generate the stub from the specs.\nHow can I isolate the controller implementation by the generated interface, since the generated code is not OOP?","AnswerCount":4,"Available Count":4,"Score":0.049958375,"is_accepted":false,"ViewCount":678,"Q_Id":55596358,"Users Score":1,"Answer":"Best solution i found, worked perfectly\nUse two branch : One with raw server stub, One with server stub filled with your code.\nGenerate new server stub versions only on the raw branch an merge it to other branch wich contains previous server stub filled with your code.\nMy workflow :\nEach time i need to modify the  server stub i checkout the raw server stub branch => then modify the openAPi file => then generate the server stub => then commit => then checkout the dev branch => then merge raw server stub branch into my dev branch.\nFor now it works well :). Hope it helps.","Q_Score":1,"Tags":"python,flask-sqlalchemy,openapi,openapi-generator,connexion","A_Id":60142397,"CreationDate":"2019-04-09T15:29:00.000","Title":"openapi code generator - python server stub workflow","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We have created website online exam portal in nodejs and mongodb hosted on amazon aws. Problem is the descriptive answer evaluation code is in python. So is there any way we can combine both. Run python code in nodejs. We have used express.js for nodejs and mongoose framework for mongodb.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":37,"Q_Id":55597443,"Users Score":0,"Answer":"You can use lambda for your python, then hit it from nodejs app, and return the response for your nodejs app.","Q_Score":0,"Tags":"python,node.js,mongodb","A_Id":55597496,"CreationDate":"2019-04-09T16:36:00.000","Title":"Is there any way to use python code in nodejs project","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am recording audio in a web browser and sending it to a flask backend. From there, I want to transcribe the audio using Watson Speech to Text. I cannot figure out what data format I'm receiving the audio and how to convert it to a format that works for watson.\nI believe watson expects a bytestring like b'\\x0c\\xff\\x0c\\xffd. The data I receive from the browser looks like [ -4 -27 -34  -9   1  -8  -1   2  10 -28], which I can't directly convert to bytes because of the negative values (using bytes() gives me that error).\nI'm really at a loss for what kind of conversion I need to be making here. Watson doesn't return any errors for any kind of data I throw at it just doesn't respond.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":276,"Q_Id":55599385,"Users Score":1,"Answer":"Those values should be fine, but you have to define how you want them stored before getting the bytes representation of them.\nYou'd simply want to convert those values to signed 2-byte\/16-bit integers, then get the bytes representation of those.","Q_Score":1,"Tags":"python,html,audio,types,data-conversion","A_Id":55601491,"CreationDate":"2019-04-09T18:46:00.000","Title":"What is this audio datatype and how do I convert it to wav\/l16?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to build a website that shows some data from a CSV file and collects some user data (which should be provided through some textbox widgets) and saves it in a CSV file(the same file). I already have a working Python code for the CSV handling.\nThe problem is that I'm not sure what programming languages I need to use besides Python in order to achieve that using Flask or Django. And I'm not familiar with web development.\nCan I make it using only Python and Django\/Flask(or any other web framework)? If not, what languages and resources do I need? And do I need a database for that? I tried some tutorials for both frameworks but Flask seems to need HTML and CSS, and Django wasn't much clear to me. Thank you.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":151,"Q_Id":55604312,"Users Score":1,"Answer":"I would recommend going with Flask rather than Django, as you'll have far less to set up and far less to learn to get your project running.\nYou will need to learn HTML, and Jinja2 (flasks templating language) but this shouldn't be too hard.\nFocus on how to do tables in HTML, and then learn about for loops in Jinja2.\nYou won't need to learn CSS unless you want to make it look pretty.","Q_Score":1,"Tags":"python,django,flask","A_Id":55605471,"CreationDate":"2019-04-10T03:24:00.000","Title":"Interactive web application with Django\/Flask issue","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Data:\n\nTransaction table with region field (Oracle database-Only read access).\nUsers table in excel with region field. (I can add this table in secondary database)\n\nLDAP Authentication is used.\nUsing views(raw SQL query is used), I am showing aggregated data of transaction table.\nAll users are seeing same data, as there is no filter on the region.\nNow, I want to aggregate only those records which login user's region belongs to.\nHow can these implemented?\nMy approach:\n\nCreate region model\nImplement a Foreign Key with transaction tables(Is it possible?)\n\nWhat is best approach to this scenario?\nPlease explain clearly in steps.\nNOTE: I have solved my problem. Please look my answer. Is there any drawbacks of my approach? (New best approach is appreciated)","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":189,"Q_Id":55616807,"Users Score":0,"Answer":"I solved this by following below steps.\nSteps:\n\nCreated a DataFrame of User Table present in excel using Pandas in my views.py.\nCaptured a login user ID into a variable.\nFiltered this User ID in DataFrame and got his\/her region and then I have passed this variable to final aggregating query and filtered there.\n\nShort and simple.","Q_Score":1,"Tags":"python,django,authentication,authorization","A_Id":55672098,"CreationDate":"2019-04-10T15:58:00.000","Title":"Django: how to fetch records only that matches the region belongs to login user?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm relatively inexperienced Python user and completely new to Flask, so I am sure this is dumb, but...\nI had a file that acted as an entry point for Flask, named some_silly_name.py which contains the line app = Flask(__name__). The server was running fine, until I decided that that name was silly, so I renamed the file to a_much_better_name.py. Now on flask run I get the error Error: Could not import \"some_silly_name\".\nWhat do I need to do to change the name of this file and still have Flask run?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1586,"Q_Id":55617913,"Users Score":0,"Answer":"Check your import statement... to be sure that you have also changed the file name from the sily_name to the better_name\nYour code will help to easily point you in the right direction.","Q_Score":1,"Tags":"python,python-3.x,flask","A_Id":55618161,"CreationDate":"2019-04-10T17:05:00.000","Title":"How to change the name of the entry point file in Flask?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm relatively inexperienced Python user and completely new to Flask, so I am sure this is dumb, but...\nI had a file that acted as an entry point for Flask, named some_silly_name.py which contains the line app = Flask(__name__). The server was running fine, until I decided that that name was silly, so I renamed the file to a_much_better_name.py. Now on flask run I get the error Error: Could not import \"some_silly_name\".\nWhat do I need to do to change the name of this file and still have Flask run?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":1586,"Q_Id":55617913,"Users Score":2,"Answer":"You did actually set an environment variable with:\nexport FLASK_APP=some_silly_name.py\n(Or with set instead of export on Windows). Even if you change your entry point file name and correct all references to the original file within the app, you'll need to re-set this variable to point to the new entry point.","Q_Score":1,"Tags":"python,python-3.x,flask","A_Id":55618193,"CreationDate":"2019-04-10T17:05:00.000","Title":"How to change the name of the entry point file in Flask?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to Django and in my Django application, I have a model that contains the basic information about a vehicle (name, model, make, year). I add the information through a form. The issue is that if the user were to enter \"alert(\"error\")\" then the form will allow it and it will be saved as valid input. So when the page refreshes, there will be an alert on the page and the field will now be blank. How to I prevent the user from entering JavaScript in the CharField?\nI do not have 'autoescape off' anywhere in the code base nor do I use the 'safe' keyword in the html. I do not have the 'def clean' checking for such input as I was under the impression that Django would take care of such injection. Thanks in advance!","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":150,"Q_Id":55620232,"Users Score":2,"Answer":"It's perfectly valid input. But it won't result in an alert on the page - because Django automatically escapes output.","Q_Score":1,"Tags":"javascript,python,django,xss","A_Id":55621423,"CreationDate":"2019-04-10T19:44:00.000","Title":"How come Django allows user to enter  in form CharField without throwing an error?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using Apache Beam to read data from Google Cloud Datastore with the help of Beam's own io.gcp.datastore.v1.datastoreio Python APIs.\nI run my pipeline on Google Cloud Dataflow.\nI want to ensure that my workers are not overloaded with data.\nHow can I read data in batches or ensure using some other mechanism that my workers are not pulling a huge amount of data in one go?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":128,"Q_Id":55638369,"Users Score":0,"Answer":"Dataflow automatically does this for you. By default, datastoreio breaks your files into 64MB chucks. If you want to break them up into smaller pieces, use the num_splits parameter on the initializer to specify how many pieces to break each file into.","Q_Score":0,"Tags":"python,google-cloud-datastore,google-cloud-dataflow,apache-beam","A_Id":55717280,"CreationDate":"2019-04-11T17:42:00.000","Title":"Read records in batches from Google Cloud Datastore using Apache Beam","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm implementing an application that tracks the locations of Australia's sharks through analysing a Twitter dataset. So I'm using shark as the keyword and search for the Twitts that contains \"shark\" and a location phrase.  \nSo the question is how to identify that \"Airlie Beach at Hardy Reef\" is the one that is correlated to \"shark\"? If it's possible, can anyone provide a working code of Python to demonstrate\u200b? Thank you so much!","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":67,"Q_Id":55649003,"Users Score":1,"Answer":"If you've already used NER to extract a list of locations, could you then create a table of target words and assign probabilities of being the correct location? For example, you are interested in beaches not hospitals. If beach is mentioned within the location, the probability of being the correct location increases. Another hacky way of doing it might be determining the number of characters or tokens between the word shark and the location - hoping that the smaller the distance, the more likely the word is to be related to the actual attack.","Q_Score":0,"Tags":"python,nlp","A_Id":55653869,"CreationDate":"2019-04-12T09:53:00.000","Title":"Extract the most relevant location corresponding to a keyword","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So I'm following a book that's teaching me how to make a Learning Log using Python and the Django web framework. I was asked to go to a terminal and create a directory called \"learning_log\" and change the working directory to \"learning_log\" (did that with no problems). However, when I try to create the virtual environment, I get an error (seen at the bottom of this post). Why am I getting this error and how can I fix this to move forward in the book?\nI already tried installing a virtualenv with pip and pip3 (as the book prescribed). I was then instructed to enter the command: \nlearning_log$ virtualenv ll_env\nAnd I get: \nbash: virtualenv: command not found\nSince I'm using Python3.6, I tried: \nlearning_log$ virtualenv ll_env --python=python3\nAnd I still get:\nbash: virtualenv: command not found\nBrandons-MacBook-Pro:learning_log brandondusch$ python -m venv ll_env\nError: Command '['\/Users\/brandondusch\/learning_log\/ll_env\/bin\/python', '-Im', 'ensurepip', '--upgrade', '-\n-default-pip']' returned non-zero exit status 1.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":538,"Q_Id":55659897,"Users Score":0,"Answer":"I had the same error. I restarted my computer and tried it again, but the error was still there. Then I tried python3 -m venv ll_env and it moved forward.","Q_Score":0,"Tags":"macos,terminal,virtualenv,python-3.6,python-venv","A_Id":60223146,"CreationDate":"2019-04-12T21:52:00.000","Title":"Why do I keep getting this error when trying to create a virtual environment with Python 3 on MacOS?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"So I'm following a book that's teaching me how to make a Learning Log using Python and the Django web framework. I was asked to go to a terminal and create a directory called \"learning_log\" and change the working directory to \"learning_log\" (did that with no problems). However, when I try to create the virtual environment, I get an error (seen at the bottom of this post). Why am I getting this error and how can I fix this to move forward in the book?\nI already tried installing a virtualenv with pip and pip3 (as the book prescribed). I was then instructed to enter the command: \nlearning_log$ virtualenv ll_env\nAnd I get: \nbash: virtualenv: command not found\nSince I'm using Python3.6, I tried: \nlearning_log$ virtualenv ll_env --python=python3\nAnd I still get:\nbash: virtualenv: command not found\nBrandons-MacBook-Pro:learning_log brandondusch$ python -m venv ll_env\nError: Command '['\/Users\/brandondusch\/learning_log\/ll_env\/bin\/python', '-Im', 'ensurepip', '--upgrade', '-\n-default-pip']' returned non-zero exit status 1.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":538,"Q_Id":55659897,"Users Score":0,"Answer":"For Ubuntu:\nThe simple is if virtualenv --version returns something like virtualenv: command not found and which virtualenv prints nothing on the console, then virtualenv is not installed on your system. Please try to install using pip3 install virtualenv  or sudo apt-get install virtualenv but this one might install a bit older one.\nEDIT\nFor Mac:\nFor Mac, you need to install that using sudo pip install virtualenv after you have installed Python3 on your Mac.","Q_Score":0,"Tags":"macos,terminal,virtualenv,python-3.6,python-venv","A_Id":55660257,"CreationDate":"2019-04-12T21:52:00.000","Title":"Why do I keep getting this error when trying to create a virtual environment with Python 3 on MacOS?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"The uploaded images are getting overridden every time when a new version of the application is deployed on to Elastic Beanstalk.\nI am deploying Django application and I think I need to do something with the YAML config files but not sure about it.\nMy application has an Image upload feature for the client. Whenever I publish the new version of the application the old one is overwritten along with the removal of the images under the image folder.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":522,"Q_Id":55664445,"Users Score":5,"Answer":"You shouldn't be storing uploaded images to the disk volume on your Elastic Beanstalk server. That disk volume will be deleted when your server is replaced due to deployments or AWS server maintenance. Plus, how would this work if you needed to scale up your Elastic Beanstalk environment to 2 or more servers? Only one server would have the image file.\nThe common solution for this issue is to store the files on S3.","Q_Score":1,"Tags":"python,django,amazon-web-services,amazon-elastic-beanstalk","A_Id":55666192,"CreationDate":"2019-04-13T10:25:00.000","Title":"How to retain images folder while publishing on Elastic Beanstalk?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have this code in my project to get all the words from pdf.\nwords = pdfPage.extract_words(0.5,0.5)\nwhich throws the below error:\nCannot convert  to Decimal.\nThanks in advance.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":31,"Q_Id":55690454,"Users Score":0,"Answer":"Try to downgrade the Pdf-minder version. Since i had this same issue resolving by downgrading.","Q_Score":0,"Tags":"python-3.x,text-extraction,python-pdfkit","A_Id":55704266,"CreationDate":"2019-04-15T13:38:00.000","Title":"python pdfpage.extract_words throws error","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have django project in which I can display records from raspberry pi device. I had mysql database and i have send records from raspberry there. I can display it via my api, but I want to work on this records.I want to change this to django database but I don't know how I can get access to django database which is on VPS server from raspberry pi device.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":66,"Q_Id":55692096,"Users Score":0,"Answer":"ALERT: THIS CAN LEAD TO SECURITY ISSUES\nA Django database is no different from any other database. In this case a MySQL.\nThe VPS server where the MySQL is must have a public IP, the MySQL must be listening on that IP (if the VPS has a public IP but MySQL is not listening\/bind on that IP, it won't work) and the port of the MySQL open (default is 3306), then you can connect to that database from any program with the required configurations params (host, port, user, password,...).\nI'm not a sysadmin expert, but having a MySQL on a public IP is a security hole. So the best approach IMO is to expose the operations you want to do via API with Django.","Q_Score":0,"Tags":"python,mysql,django","A_Id":55693009,"CreationDate":"2019-04-15T15:05:00.000","Title":"How to get access to django database from other python program?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to run python manage.py runserver but i'm getting \nLookupError: No installed app with label 'admin'\nthis is what i get by python manage.py check\n\nTraceback (most recent call last):   File \"manage.py\", line 21, in\n  \n      main()   File \"manage.py\", line 17, in main\n      execute_from_command_line(sys.argv)   File \"C:\\Users\\hitma\\Envs\\ftest\\lib\\site-packages\\django\\core\\management__init__.py\",\n  line 381, in execute_from_command_line\n      utility.execute()   File \"C:\\Users\\hitma\\Envs\\ftest\\lib\\site-packages\\django\\core\\management__init__.py\",\n  line 357, in execute\n      django.setup()   File \"C:\\Users\\hitma\\Envs\\ftest\\lib\\site-packages\\django__init__.py\", line\n  24, in setup\n      apps.populate(settings.INSTALLED_APPS)   File \"C:\\Users\\hitma\\Envs\\ftest\\lib\\site-packages\\django\\apps\\registry.py\",\n  line 114, in populate\n      app_config.import_models()   File \"C:\\Users\\hitma\\Envs\\ftest\\lib\\site-packages\\django\\apps\\config.py\",\n  line 211, in import_models\n      self.models_module = import_module(models_module_name)   File \"C:\\Users\\hitma\\Envs\\ftest\\lib\\importlib__init__.py\", line 126, in\n  import_module\n      return _bootstrap._gcd_import(name[level:], package, level)   File \"\", line 996, in _gcd_import   File\n  \"\", line 979, in _find_and_load   File\n  \"\", line 968, in _find_and_load_unlocked \n  File \"\", line 673, in _load_unlocked\n  File \"\", line 667, in\n  exec_module   File \"\", line 222, in\n  _call_with_frames_removed   File \"C:\\Users\\hitma\\Envs\\ftest\\lib\\site-packages\\django\\contrib\\auth\\models.py\",\n  line 2, in \n      from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager   File\n  \"C:\\Users\\hitma\\Envs\\ftest\\lib\\site-packages\\django\\contrib\\auth\\base_user.py\",\n  line 47, in \n      class AbstractBaseUser(models.Model):   File \"C:\\Users\\hitma\\Envs\\ftest\\lib\\site-packages\\django\\db\\models\\base.py\",\n  line 117, in new\n      new_class.add_to_class('_meta', Options(meta, app_label))   File \"C:\\Users\\hitma\\Envs\\ftest\\lib\\site-packages\\django\\db\\models\\base.py\",\n  line 321, in add_to_class\n      value.contribute_to_class(cls, name)   File \"C:\\Users\\hitma\\Envs\\ftest\\lib\\site-packages\\django\\db\\models\\options.py\",\n  line 204, in contribute_to_class\n      self.db_table = truncate_name(self.db_table, connection.ops.max_name_length())   File\n  \"C:\\Users\\hitma\\Envs\\ftest\\lib\\site-packages\\django\\db__init__.py\",\n  line 28, in getattr\n      return getattr(connections[DEFAULT_DB_ALIAS], item)   File \"C:\\Users\\hitma\\Envs\\ftest\\lib\\site-packages\\django\\db\\utils.py\", line\n  201, in getitem\n      backend = load_backend(db['ENGINE'])   File \"C:\\Users\\hitma\\Envs\\ftest\\lib\\site-packages\\django\\db\\utils.py\", line\n  110, in load_backend\n      return import_module('%s.base' % backend_name)   File \"C:\\Users\\hitma\\Envs\\ftest\\lib\\importlib__init__.py\", line 126, in\n  import_module\n      return _bootstrap._gcd_import(name[level:], package, level)   File \"C:\\Users\\hitma\\Envs\\ftest\\lib\\site-packages\\django\\db\\backends\\sqlite3\\base.py\",\n  line 28, in \n      from .introspection import DatabaseIntrospection            # isort:skip   File\n  \"C:\\Users\\hitma\\Envs\\ftest\\lib\\site-packages\\django\\db\\backends\\sqlite3\\introspection.py\",\n  line 4, in \n      import sqlparse   File \"C:\\Users\\hitma\\Envs\\ftest\\lib\\site-packages\\sqlparse__init__.py\",\n  line 16, in \n      from sqlparse import filters   File \"C:\\Users\\hitma\\Envs\\ftest\\lib\\site-packages\\sqlparse\\filters__init__.py\",\n  line 17, in \n      from sqlparse.filters.tokens import KeywordCaseFilter   File \"C:\\Users\\hitma\\Envs\\ftest\\lib\\site-packages\\sqlparse\\filters\\tokens.py\",\n  line 27, in \n      class KeywordCaseFilter(_CaseFilter): TypeError: '_TokenType' object is not callable\n\ni followed the main doucment for installing django,Thanks\ndjango version: 2.2\npython: 3.6.0a4","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":2044,"Q_Id":55692193,"Users Score":1,"Answer":"It is an issue related to sqlparse. It happens when you are using newest version of packages.\nTry : \npip install sqlparse \nNote - your terminal must activate virtual environment.","Q_Score":0,"Tags":"python,django","A_Id":56242222,"CreationDate":"2019-04-15T15:10:00.000","Title":"Running python manage.py runserver returns error LookupError: No installed app with label 'admin'","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a java server sending out a request where the path contains the hostname.\nOTOH I've got an ancient django server (1.8) that figures (wrongly) that the hostname is part of the path, and always returns a 404.\nAssuming that sending properly formed requests from java side is not possible, how would I go about modifying the request URL to something that can be properly redirected to, without actually redirecting? (a 30x is also unacceptable in this case).","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":34,"Q_Id":55693067,"Users Score":0,"Answer":"I ended up doing a rewrite in nginx (using proxy_pass).\nI couldn't solve this at the application level in any feasible way.","Q_Score":0,"Tags":"python,django","A_Id":57443493,"CreationDate":"2019-04-15T15:58:00.000","Title":"Rerouting request via middleware in django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"What happened after entered \"flask run\" on a terminal under the project directory?\nHow the python interpreter gets the file of flask.__main__.py and starts running project's code?\nI know how Flask locates app. What I want to figure out is how command line instruction \"flask run\" get the flask\/__main__.py bootup","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":117,"Q_Id":55707275,"Users Score":2,"Answer":"flask is a Python script. Since you stated you are not a beginner, you should simply open the file (\/usr\/bin\/flask) in your favorite text editor and start from there. There is no magic under the hood.","Q_Score":0,"Tags":"python,flask","A_Id":55708668,"CreationDate":"2019-04-16T11:37:00.000","Title":"What happened after entered \" flask run\" on a terminal under the project directory?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Flask-Migrate (Alembic) to manage SQLAlchemy database migrations. I'm working on two different branches with different migrations. \n\nIf I switch branches, I get an error that the migration is not found.\nIf i merge this branches into the parent branch, I need downgrade migration's on both multiple branches and create new one. If I will not, I get migration's conflict error. \n\nHow can I do it easier? Maybe another tool that more like Django's migrations, but for Flask?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2068,"Q_Id":55715129,"Users Score":16,"Answer":"Alembic requires the chain of migrations to match the database marker for the current migration. If you create and run some migrations on a branch, then switch to another branch, the database is marked as being on a migration that no longer exists.\nTo work on multiple branches while using migrations, you'll need to figure out what the latest common migration on the branch you're switching to is, then downgrade to that version first. Then checkout the branch, and run any migrations that are unique to it.\nFor example, assume you created two branches off the \"dev\" branch called \"feature1\" and \"feature2\", and each have one new migration since \"dev\". To switch from \"feature1\" to \"feature2\":\n\nDowngrade the migrations added to the branch, in this case 1: flask db downgrade -1.\nCheckout the branch: git checkout feature2\nApply any upgrades for the new branch: flask db upgrade\n\nIf you don't want to lose data due to downgrades that remove columns or tables, you'll need to dump and restore the database for each branch instead.\n\nIf you're working on \"feature1\" and merge it into \"dev\", you need to update \"feature2\" so it knows about the new migrations that were merged in. Alembic will support having multiple branches as long as all the migrations are present. Once you merge \"feature2\", you can generate a merge migration to consolidate the two migration branches back to one.\n\nMerge \"feature1\" into \"dev\": git checkout dev, git merge feature1\nSwitch to \"feature2\" and merge \"dev\": git checkout feature2, git merge dev\nRun the migrations from \"dev\" and \"feature2\": flask db upgrade\nContinue working on \"feature2\".\nMerge \"feature2\" into \"dev\": git checkout dev, git merge feature2\nFind the migration ids that need to be merged: flask db heads\nflask db merge id1 id2, substituting the ids from the previous step.\nUpdate to the merge, note that there is only one head: flask db upgrade, flask db heads\n\n\nUnfortunately, this is a manual process. Alembic requires the migration chain to match the database marker, and there is currently no way around that. You may be able to write a git hook to help with this, but it's not something that already exists.","Q_Score":9,"Tags":"python,git,sqlalchemy,alembic,flask-migrate","A_Id":55715541,"CreationDate":"2019-04-16T19:11:00.000","Title":"Work on multiple branches with Flask-Migrate","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm new to Django and Angular, I've just started my internship and I'm working on an application that uses Angular for the frontend and Django for the backend.\nI've added a new field to one of my models, I did the migration, but I don't know what the next step is going to be?  Do I need to add something in the views?\nMy goal is to also add this field on the user interface so that the user can select the correct information.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":47,"Q_Id":55722896,"Users Score":0,"Answer":"Did you develop a rest API using Django for your Angular project? If so, you need to add (GET\/POST) Add method on your rest side and return the object with the field from the database. \nAs soon as you get the object you can do whatever you want on the frontend side, for example, view the field value to the user.","Q_Score":0,"Tags":"python,django,angular","A_Id":55723688,"CreationDate":"2019-04-17T08:13:00.000","Title":"Add a new field on my model and on my user interface","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created a file called utils.py in my Django app, where I keep random classes or functions that do something.\nI have run into an issue, where I can't import any model in utils.py file.\nI have models called User which inherit from AbstractUser and it's been said to Django by: AUTH_USER_MODEL = 'main.User'\nI have also a model called Project.\nWhenever I type from main.models import Project or User in utils.py I get django.core.exceptions.ImproperlyConfigured: AUTH_USER_MODEL refers to model 'main.User' that has not been installed\nOf course main is in installed apps in settings.\nI have solved this before by using get_user_model() for User, but there is no such a function to get a Project.\nHow to solve this problem? Am I missing something?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":251,"Q_Id":55724316,"Users Score":0,"Answer":"Circular import. I've been importing mixin from utils in model and in utils I've been importing model from models that inherited mixin.","Q_Score":0,"Tags":"python,django","A_Id":55724521,"CreationDate":"2019-04-17T09:29:00.000","Title":"Importing model in utils.py causes ImproperlyConfigured","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have view_xx.py and view_yy.py and I also have a common views.py.\nI want to put a validation for checking that request.page_size is less than or equal to request.registry.settings[\"max_page_size\"].\nHow do I do this?\nIs it possible using contexts in a common views.py file?\nI am not sure how to put a context such that it first goes to view_xx.py depending on URL and then goes to common views function to validate page size and then again comes back to the view_xx.py view for further steps.","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":34,"Q_Id":55728238,"Users Score":2,"Answer":"The simplest approach is to perform that check when setting\/computing request.page_size.","Q_Score":1,"Tags":"python,pyramid","A_Id":55732642,"CreationDate":"2019-04-17T13:05:00.000","Title":"How to put common validation to all views?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've been given access to an Ubuntu machine running Apache 2.4.18 for the purpose of hosting a small web application I've developed in Flask.  I'm a user without root privileges.  The system administrator has kindly installed mod_wsgi for me, but this module is linked against the system python, which is version 2.7, and I'd like to use python >= 3.6.  I've therefore compiled my own python 3.7 and my own mod_wsgi on this machine, and am having trouble getting Apache to use it.  Is this possible?\nI've tried adding a LoadModule wsgi_module ...\/mod_wsgi-py37.cpython-37m-x86-64-linux-gnu.so line to var\/www\/html\/whatever\/.htaccess, but have learned that this is not allowed at the Directory level of the configuration.  I've also tried using WSGIDaemonProcess user python-home=..., but this also causes Apache to return an Internal Server Error.\nTo make matters worse, I do not have permissions on var\/log\/apache2, so I can't see any Apache output except what it's serving.\nIs it possible to point Apache to my own mod_wsgi and python binaries without having access to the root configuration of Apache or the system?  If not, are there any workarounds?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":93,"Q_Id":55728668,"Users Score":1,"Answer":"AFAIK you can only run Apache with a single version of mod_wsgi at any one time.  This means that all apps must use the same version of Python, which is a problem I have run into before.  I think your options are:\na) Persuade the sysadmin to switch to your version.  It is fine to use a version of Python that is different to system Python.\nb) Have a look at something like Gunicorn.  That is more separated from Apache, so will allow apps to use different versions of Python on the same server.","Q_Score":1,"Tags":"python,apache,mod-wsgi","A_Id":55728980,"CreationDate":"2019-04-17T13:27:00.000","Title":"Use custom mod_wsgi and python with limited access to a shared server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I added my applications on DigitalOcean. But when I turn on my website I see the error. \"502 Bad Gateway nginx\/1.14.0 (Ubuntu)\". I would like to solve it, but I do not know where I can find logs with errors.\nI always used CMD and when I tried to turn on the server, if something did not work, the CMD clearly said what was wrong. Where can I find something like this on DigitalOcean. I used PythonAnywhere once, and there was a separate tab with information about errors (practically the same as in CMS). Please forgive me for simple questions, I have little experience in servers and GIT.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1046,"Q_Id":55730655,"Users Score":1,"Answer":"502 probably means you got some errors in your application - you'd better check out your gunicorn(or other WSGI server) logs. Location of the logs depends on what WSGI server you're using but probably you can check it out in WSGI's config file.\nAlso you can try to do standard 'runserver' just to ensure that your application can run correctly. \nps aux | grep gunicorn (or smth like this command) can tell you if it's runnning.\nIf it's not, chek out the logs. Also, you can go to your config file, check the command that you're trying to use to start the server, try it out in the console.\nIn final you can ensure that your nginx config is correct too with nginx -t command.","Q_Score":0,"Tags":"python,django,digital-ocean","A_Id":55731993,"CreationDate":"2019-04-17T15:00:00.000","Title":"502 Bad Gateway. After implementing the application on 'digitalocean'","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"After having to increase max_length of another field in a model, I've started to wonder: maybe this is not the way?\nI'm getting data from an external API, so I can't check what's the maximum length. Let's say that I'm guessing the field can have 100 chars - because it makes sense, but I have no idea if this is actually the case, there might appear a value which is 300 chars long. What's the recommended approach here? \n1) Truncate the value (where should I put the code then? and what with fields such as URL, which won't work after truncating?)?\n2) Skip the value?\n3) Set length of every field to 100*expected length?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":2209,"Q_Id":55762514,"Users Score":9,"Answer":"The point of max_length is that you decide it. If you really want variable\/unlimited length text, use TextField instead.\nThe max_length is enforced on database level, If it's longer, it will just fail. If you want to truncate it from code side, you have to do it yourself, most likely in the function where you create the entry.\n\nNote that, many databases optimize text fields, so there's no penalty in  performance for varying length text.","Q_Score":4,"Tags":"python,django,django-models","A_Id":55762613,"CreationDate":"2019-04-19T13:18:00.000","Title":"Best practices for unknown max_length in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"After having to increase max_length of another field in a model, I've started to wonder: maybe this is not the way?\nI'm getting data from an external API, so I can't check what's the maximum length. Let's say that I'm guessing the field can have 100 chars - because it makes sense, but I have no idea if this is actually the case, there might appear a value which is 300 chars long. What's the recommended approach here? \n1) Truncate the value (where should I put the code then? and what with fields such as URL, which won't work after truncating?)?\n2) Skip the value?\n3) Set length of every field to 100*expected length?","AnswerCount":2,"Available Count":2,"Score":0.1973753202,"is_accepted":false,"ViewCount":2209,"Q_Id":55762514,"Users Score":2,"Answer":"Expanding on blue_notes response I'd recommend that you always use TextField instead of CharField unless the datatype has a fundamental maximum length.  For example, ISO currency codes are always exactly 3 characters and make sense as a CharField.\nIn many situations using a max length character field will result in worse performance in the database then than using their unlimited length varchar field if the field length isn't actually fixed","Q_Score":4,"Tags":"python,django,django-models","A_Id":55763167,"CreationDate":"2019-04-19T13:18:00.000","Title":"Best practices for unknown max_length in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to extract audio track information (specifically language of the audio) from a live stream that i will be playing with libVLC . Is it possible to do this in javascript or python without writing new code for a wrapper?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":74,"Q_Id":55780457,"Users Score":0,"Answer":"Not sure about javascript, but the Python wrapper will let you do this.","Q_Score":0,"Tags":"javascript,python,node.js,libvlc","A_Id":55788853,"CreationDate":"2019-04-21T06:29:00.000","Title":"Is it possible to get audio track data from libVLC by using javascript\/python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am fairly new to Python. I have a django based web application where I am performing some tasks using Kafka. \nI am using confluent-kafka wrapper to communicate with the Kafka Broker.\nSo once a topic is created on the kafka broker, I assign a consumer to subscribe to this process, to make this non-blocking, I am using multiprocessing module so that the consumer runs on a separate thread and not block the main application thread.\nHowever, I am not sure, what will happen if my server shuts down? Will the process still run like how the cronjobs still run even if the server is not running?\nIf not can someone please suggest me how should I trigger my consumer so that it is independent of my django server?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1108,"Q_Id":55781423,"Users Score":0,"Answer":"If you need your web server to actually get the data from Kafka, they need to be running together.\nYou probably don't want the consumer actively running in the background (as a separate process, not a thread) because then you're effectively not processing messages. \nDepending on what your data is, you could use Kafka Connect on the same machine as Django to write the Kafka events to a database, then Django would query the database instead","Q_Score":0,"Tags":"django,python-3.x,multithreading,apache-kafka","A_Id":55784029,"CreationDate":"2019-04-21T09:16:00.000","Title":"How to create a kafka consumer independent of Django server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am fairly new to Python. I have a django based web application where I am performing some tasks using Kafka. \nI am using confluent-kafka wrapper to communicate with the Kafka Broker.\nSo once a topic is created on the kafka broker, I assign a consumer to subscribe to this process, to make this non-blocking, I am using multiprocessing module so that the consumer runs on a separate thread and not block the main application thread.\nHowever, I am not sure, what will happen if my server shuts down? Will the process still run like how the cronjobs still run even if the server is not running?\nIf not can someone please suggest me how should I trigger my consumer so that it is independent of my django server?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1108,"Q_Id":55781423,"Users Score":0,"Answer":"bind the signals:\nsignal.signal(signal.SIGTERM, signal_handler)\nsignal.signal(signal.SIGINT, signal_handler)\nand use try-except blok and you can do a clean up afterwards.\nto make consumer more independend, you can use django-celery-beat","Q_Score":0,"Tags":"django,python-3.x,multithreading,apache-kafka","A_Id":69200577,"CreationDate":"2019-04-21T09:16:00.000","Title":"How to create a kafka consumer independent of Django server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have an application (dev stage) running on one validator, one transaction processor and client. I would like to update the way I create addresses. If I change the way I create addresses, the old addresses won't be accessible. I would like to know what is the practice that should be followed in order to achieve the aforementioned.\nRight now, if I make any changes at the processor level, I simply flush the existing blockchain and create a new genesis block and start over. I know this isn't the way it should be.\nPlease advise.","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":82,"Q_Id":55783073,"Users Score":2,"Answer":"You can read all the current addresses and write the value to the new address. Use the delete_state in the SDK to delete the old state variable. The data will remain in previously-created blocks (which are immutable), but will not be in the current blockchain state.","Q_Score":1,"Tags":"python-3.x,hyperledger-sawtooth","A_Id":55796844,"CreationDate":"2019-04-21T13:16:00.000","Title":"Updating addressing on a running Sawtooth application","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Looking for suggestions on how to store Price data using MAN AHL's Arctic Library for 5000 stocks EOD data as well as 1 minute data. Separate solutions for EOD and 1-minute data are also welcome. Once the data is stored, I want to perform the following operations:\n\nFetch data for a subset of stocks (lets say around 500-1000 out of the entire universe of 5000 stocks) between a given datetime range.\nAny update to historical data (data once stored in database) should have versioning. Data prior to the update should not be discarded. I should be able to fetch data as of a particular version\/timestamp.\n\nExample format of data:\n\n        Date        Stock        Price\n0       d1          s1            100\n1       d2          s1            110\n2       d3          s1            105\n3       d1          s2            50\n4       d2          s2            45\n5       d3          s2            40","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":105,"Q_Id":55785898,"Users Score":0,"Answer":"Arctic supports a few different storage engines. The only one that will do what you're looking for is VersionStore. It keeps versions of data, so any update you make to the data will be versioned, and you can retrieve data by timestamp ranges and by version. \nHowever it does not let you do a subsetting of stock like you want to do. I'd recommend subsetting your universe (say into US, EMEA, EUR, etc) or into whatever other organization makes sense for your use case.","Q_Score":0,"Tags":"python,pandas,finance","A_Id":60627318,"CreationDate":"2019-04-21T19:14:00.000","Title":"Storing and fetching multiple stocks in Arctic Library","Data Science and Machine Learning":1,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have roughly 80tb of images hosted in an S3 bucket which I need to send to an API for image classification. Once the images are classified, the API will forward the results to another endpoint.\nCurrently, I am thinking of using boto to interact with S3 and perhaps Apache airflow to download these images in batches and forward them to the classification API, which will forward the results of the classification to a web app for display.\nIn the future I want to automatically send any new image added to the S3 bucket to the API for classification. To achieve this I am hoping to use AWS lambda and S3 notifications to trigger this function.\nWould this be the best practice for such a solution?\nThank you.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":159,"Q_Id":55795614,"Users Score":1,"Answer":"For your future scenarios, yes, that approach would be sensible:\n\nConfigure Amazon S3 Events to trigger an AWS Lambda function when a new object is created\nThe Lambda function can download the object (to \/tmp\/) and call the remote API\nMake sure the Lambda function deletes the temporary file before exiting since the Lambda container might be reused and there is a 500MB storage limit\n\nPlease note that the Lambda function will trigger on a single object, rather than in batches.","Q_Score":0,"Tags":"python,amazon-web-services,amazon-s3,aws-lambda,airflow","A_Id":55800992,"CreationDate":"2019-04-22T14:01:00.000","Title":"Large Scale Processing of S3 Images","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to run a Selenium Script (Using PHP) using a Webserver.\nI'm working on Kali and to simulate the Webserver I use Xampp.\nI tried to run the selenium script on Xampp by the following steps:\n-Download the Php Webdriver Bindings, put them in the folder 'htdpcs' of xampp and edit the 'example.php' file following the settings of my own device.\n-Download and execute the Selenium Server Standalone, on port :4444.\nIn the end, I download the geckodriver and I execute the file, but I got the this error:\nOSError: [Errno 98] Address already in use\nHow to fix it in order to run the php-selenium script?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":269,"Q_Id":55816936,"Users Score":0,"Answer":"The Selenium Server will fork a geckodriver as soon as it needs one to start a new browser session. You should not start a geckodriver yourself. If you want to use its Webdriver API yourself you can start it with the --webdriver-port argument.","Q_Score":0,"Tags":"python,selenium,selenium-webdriver","A_Id":55820106,"CreationDate":"2019-04-23T17:59:00.000","Title":"Selenium Servers and Geckodriver don't run at same port","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a VM with Zeppelin that is a shared environment. I want to add boto3 so I can do some python against AWS. Since zeppelin is running as a service, where would I add the AWS credentials? Would it be in the root's home? Or the home account the service is running under? Or within Zeppelin's user can they supply their own AWS credentials? \nI did pip install boto3 on the OS and then tried in a notebook to import it and I got a ModuleNotFoundError: No module named 'boto3' error.\nLooking for guidance from anyone who has gotten their zeppelin to work with AWS.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":509,"Q_Id":55817105,"Users Score":0,"Answer":"Zeppelin can be installed in several ways , which could point to the root cause of the issue : \n\nvia the tar file download - in that case @mootmoot's way is right . boto3 should be configured with the appropriate python interpreter  \nvia docker image - in that case you need to add the python module to the docker image itself : \n\n2.a. you can use 'docker exec -i -t  bash\\sh(your preference)'\n2.b pip install","Q_Score":0,"Tags":"python,amazon-web-services,boto3,apache-zeppelin","A_Id":56096800,"CreationDate":"2019-04-23T18:11:00.000","Title":"How to: Zeppelin + boto3 + AWS Credentials","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am writing an ECS framework and also a game with it, in Python. In an ECS framework, components should contain only data. However, sometimes setup code is needed to create the data. For example, in an audio component, the data would be the volume of the the sound to play and the path to the audio file. But in the audio-playing library, there are objects to represent sounds, which have a sound.play() method, for example. My question is whether this object should be created in the component, which sort of violates the rule that entities should be pure data, or in the system. If it should best be done in a system, it would only need to be done once (and it would harm performance if the audio file needed to be created once per frame). What is the best way to do this?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":409,"Q_Id":55818460,"Users Score":1,"Answer":"My question is whether this object should be created in the component, which sort of violates the rule that entities should be pure data, or in the system. If it should best be done in a system, it would only need to be done once (and it would harm performance if the audio file needed to be created once per frame). What is the best way to do this?\n\nWhen you use the outboard model for an entity system, I think one of the most important tasks to nail down is both entity and component life-cycle management.  Without it, it becomes really difficult to write system code that doesn't start to resemble spaghetti.\nThere are implementations out there where they expect you to construct the entity, build its component list, then activate the entity.  Once the entity is activated, you can't add or remove components, but only change the component's attribute values.  In order to add\/remove components, you deactivate the entity, make the changes, then reactivate it.\nLets assume we use this entity life-cycle process.\nWhen the entity with the audio component is activated, the audio system is notified, reads the attributes from the audio component, and finally creates the audio framework's sound object.  It would then be the system's responsibility to maintain a bookkeeping map between the component and sound object.  This internal map is what the system would use each frame to perform its update.\nWhen the entity with the audio component is deactivated, the audio system is notified, destroys the audio framework's sound object associated with the component in the internal bookkeeping map, then removes the entry from the internal map.","Q_Score":0,"Tags":"python,design-patterns,components,entity,entity-component-system","A_Id":56007732,"CreationDate":"2019-04-23T19:52:00.000","Title":"How should setup code be handled in entity-component-system?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a problem with my project. It involves downloading data from various websites.\nFor now it's tens of pages, but in the future it will be thousands of pages depending on the country. Each page has its own script.\nTo support these scripts, I created a main script that calls each subsequent script on a separate thread using the multi-threading library. \nThe script on the input has a path to the file with data already downloaded to the database, and on the output it gives the second file only with new data. At the moment, this solution was used only for 4 pages. It works as I assume. But I wonder what happens when these websites will be a few hundred or a few thousand?\nI think I could create a separate main script depending on the country, but as a result, it would give at least several hundred pages (scripts) per country, so according to my logic, several hundred threads run at one time.\nDoes it have a chance to operate on such a number of websites? I opted for multithreading due to the large number of web content download operations.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":66,"Q_Id":55831248,"Users Score":0,"Answer":"Ok, sounds smart :) Now I have 2 scripts with 'ThreadPool' method. Works fine. But to execute these scripts I have 'main_script' which until today I have separate threads for each script. So in main_script I can use too 'ThreadPool' method? And then how looks like a cost of CPU and generally perfomance? Because in future I want have e.g. 100 scripts in main_script (e.g. max_workers = 5) and every script have too ThreadPool (e.g. max_workers=5), so in one time I have a 5x5 = 25 threads?","Q_Score":0,"Tags":"python,multithreading,web-scraping","A_Id":56000171,"CreationDate":"2019-04-24T13:29:00.000","Title":"How handle multithreading on big-scale web scraping project?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Flask python app running on IBM cloud. The app needs some configuration parameter which it gets from a configuration file. I need to encrypt the configuration file using a symmetric key. How can I do that and where I can store my decrypt key? Ideally I don't want to hard code it into my code.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":24,"Q_Id":55838341,"Users Score":0,"Answer":"12 Factor question. Embed it in the app's deployment environment variables and read the value at runtime.","Q_Score":0,"Tags":"python,ibm-cloud,encryption-symmetric","A_Id":55838704,"CreationDate":"2019-04-24T20:48:00.000","Title":"How to secure a configuration file in IBM Cloud","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using Django to develop a web app. When I run server, I get the below error message. \nError: Page not found (404)\nUsing the URLconf defined in Mywebsite_Website.urls, Django tried these URL patterns, in this order:\n^$ [name='index']\n^admin\/\nThe empty path didn't match any of these.\nAny suggestions?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":459,"Q_Id":55839791,"Users Score":1,"Answer":"Django is trying to route a path request to a defined URL in one of your urls.py files.\nSo far you only have two possible options set up with your urls.py files it seems:\n\nthe Admin pages at: yoururl.com\/admin\/\nthe Index page at: yoururl.com\/\n\nThe URL that you tried to go to does not fall into either of those categories. Out in the wild this would result in a 404 Page Not Found Error.","Q_Score":1,"Tags":"python,django","A_Id":55840453,"CreationDate":"2019-04-24T23:18:00.000","Title":"Error while running Django Server -The empty path didn't match any of these","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Python WebJob living in Azure and I'm trying to pass parameters to it. \nI've found documentation saying that I should be able to post the URL and add:?arguments={'arg1', 'arg2'} after it. \nHowever, when I do that and then try to print(sys.argv) in my code, it's only printing the name of the Python file and none of the arguments I pass to it. \nHow do I get the arguments to pass to my Python code? I am also using a run.cmd in my Azure directory to trigger my Python code if that makes a difference. \nUPDATE: So I tested it in another script without the run.cmd and that certainly is the problem. If I just do ?arguments=22 66 it works. So how do I pass parameters when I'm using a run.cmd file?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":184,"Q_Id":55870100,"Users Score":2,"Answer":"I figured it out: in the run.cmd file, you need to put \"%*\" after your script name and it will detect any arguments you passed in the URL.","Q_Score":1,"Tags":"python,azure,azure-webjobs","A_Id":55873033,"CreationDate":"2019-04-26T14:50:00.000","Title":"Python Azure webjob passing parameters","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am confused about the mean of JWT_DEFAULT_REALM or the mean of \"The default realm\" when I am using Flask_JWT. I am not a native English speaker.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":264,"Q_Id":55876768,"Users Score":1,"Answer":"The realm is part of the HTTP standard and send with an authentication request from the server to the client together with an authentication type (JWT in this case).\nIt describes the resource that is protected. In Basic authentication type it will be the resource name shown in the login box above the form fields. \nIn authentication with JWTs it makes less sense since you would not expect the user to manually enter the JWT and browsers don't have special handling for the type JWT. So it will at max be included in an error message.","Q_Score":0,"Tags":"python,flask,flask-jwt","A_Id":55876861,"CreationDate":"2019-04-27T02:34:00.000","Title":"What is the mean of JWT_DEFAULT_REALM?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to host a python script on Google Cloud which would run indefinitely. \nWhich Google Cloud Products can be used to achieve this reliably and economically?\nis this possible on AppEngine?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1103,"Q_Id":55890781,"Users Score":2,"Answer":"Within GCP there are a number of ways to run processing logic.  We have App Engine, Functions, Compute Engine, GKE, Cloud Run and more.  Of these, Compute Engine and GKE provide the lowest level control meaning that you can orchestrate code to run 100% of the time ... and basically do anything you want.  Based on your story, it sounds like a Compute Engine would be what you want.  When you create a Compute Engine, you are basically given a Virtual Machine (commonly Linux) and you simply run what ever logic \/ applications you want within that environment.  Google charges you for the duration that the Compute Engine runs.  If you have an always running explicit Python app, then you will be billed 24x7 irrespective of whether or not traffic is actually arriving.\nOther capabilities that you are likely going to want to consider are Cloud Functions.  A Cloud Function is logic that runs only when there is an active request to be processed.  It is GCP's responsibility to passively listen for new requests without charging you for that service.  When a request arrives, your logic is executed and you are billed only for the duration that your logic ACTUALLY executes.  Cloud Run is similar to Cloud Functions but the logic is hosted in a Kubernetes environment as opposed to native.\nFor Cloud Function, incoming requests can arrive either via REST requests or via GCP Pub\/Sub.  In your description, neither of these apply as you are receiving data via MQTT.  This is where Google IOT Core comes into play.  Google IoT core is a full suite environment for managing IoT devices.  Primary among this story is the ability to passively listen for incoming MQTT requests.  When an authorized IoT device sends in an MQTT request, the Google IoT core automatically forwards the content of the MQTT request via GCP Pub\/Sub.  This then decouples the mechanics of the arriving IoT message from how it will be eventually processed.  Since the MQTT message has now been published to GCP Pub\/Sub, this can then be used as a trigger for a Google Cloud Function.\nFollowing all these parts ... one possibility to examine which may result in the cheapest and more dynamically scalable solution would be:\nIoT Device --- MQTT ---> IoT Core --- Pub\/Sub ---> Cloud Function\nThis story has basically changed the paradigm from \"How do I actively listen for requests in my code in an indefinite manner\" to \"How do I have my code executed when a request arrives\".","Q_Score":2,"Tags":"python,google-app-engine,google-cloud-platform","A_Id":55892588,"CreationDate":"2019-04-28T13:36:00.000","Title":"Always Running Python Script on Google Cloud","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I use flask and gunicorn for deploy on production scale machine learning models, but the memory using gunicorn with 4 workers is very huge (almost 4x) without gunicorn. Can gunicorn use less memory?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1974,"Q_Id":55897044,"Users Score":0,"Answer":"Adjust your worker to (2*CPU)+1. This is the suggested maximum concurrent requests when using workers and threads.","Q_Score":2,"Tags":"python","A_Id":55898014,"CreationDate":"2019-04-29T04:37:00.000","Title":"How make gunicorn and flask not consume huge memory","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a list of approx. 52 websites which lead to about approx. 150 webpages that i require scraping on. Based on my ignorance and lack of research i started building crawlers per webpage which is starting to become to difficult to complete and maintain. \nBased on my analysis thus far I already know what information i want to scrape per webpage and it is clear that these websites have their own structure. On the plus side i noticed that each website has some commonalities in their web structure among their webpages.\nMy million dollar question, is there a single technique or single web crawler that i can use to scrape these sites? I already know the information that I want, these sites are rarely updated in terms of their web structure and most of these sites have documents that need to be downloaded. \nAlternatively, is there a better solution to use that will reduce the amount of web crawlers that I need to build? additionally, these web crawlers will only be used to download the new information of the websites that i am aiming them at.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":76,"Q_Id":55900736,"Users Score":0,"Answer":"[\u2026] i started building crawlers per webpage which is starting to become to difficult to complete and maintain [\u2026] it is clear that these websites have their own structure. [\u2026] these sites are rarely updated in terms of their web structure [\u2026]\n\nIf websites have different structures, having separate spiders makes sense, and should make maintenance easier in the long term.\nYou say completing new spiders (I assume you mean developing them, not crawling or something else) is becoming difficult, however if they are similar to an existing spider, you can simply copy-and-paste the most similar existing spider, and make only the necessary changes.\nMaintenance should be easiest with separate spiders for different websites. If a single website changes, you can fix the spider for that website. If you have a spider for multiple websites, and only one of them changes, you need to make sure that your changes for the modified website do not break the rest of the websites, which can be a nightmare.\nAlso, since you say website structures do not change often, maintenance should not be that hard in general.\nIf you notice you are repeating a lot of code, you might be able to extract some shared code into a spider middleware, a downloader middleware, an extension, an item loader, or even a base spider class shared by two or more spiders. But I would not try to use a single Spider subclass to scrape multiple different websites that are likely to evolve separately.","Q_Score":0,"Tags":"python,scrapy,web-crawler","A_Id":55919394,"CreationDate":"2019-04-29T09:44:00.000","Title":"Using a Single Web Crawler to Scrape Multiple websites in a predefined format with attachments?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a list of approx. 52 websites which lead to about approx. 150 webpages that i require scraping on. Based on my ignorance and lack of research i started building crawlers per webpage which is starting to become to difficult to complete and maintain. \nBased on my analysis thus far I already know what information i want to scrape per webpage and it is clear that these websites have their own structure. On the plus side i noticed that each website has some commonalities in their web structure among their webpages.\nMy million dollar question, is there a single technique or single web crawler that i can use to scrape these sites? I already know the information that I want, these sites are rarely updated in terms of their web structure and most of these sites have documents that need to be downloaded. \nAlternatively, is there a better solution to use that will reduce the amount of web crawlers that I need to build? additionally, these web crawlers will only be used to download the new information of the websites that i am aiming them at.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":76,"Q_Id":55900736,"Users Score":0,"Answer":"I suggest you crawl specific tags such as body, h1,h2,h3,h4,h5, h6,p and... for each links. You can gather all p tags and append them into a specific link. It can be used for each tags you want to crawl them. Also, you can append related links of tags to your database.","Q_Score":0,"Tags":"python,scrapy,web-crawler","A_Id":55920004,"CreationDate":"2019-04-29T09:44:00.000","Title":"Using a Single Web Crawler to Scrape Multiple websites in a predefined format with attachments?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Do I need an actual mailbox and verified email to send email with SES?\nI own the domain I am trying to send from, but I do not have an account or mailbox setup (this is just a test domain, and I don't want to setup a gmail mailbox) \nIs there a better way to be doing this in a test environment?\nI am using the django-ses package, and sending email like this:\nsend_mail('Test subject', 'This is the body', 'mypersonalemail@yahoo.com',['info@mydomain.com'])\nI very well may have a fundamental misunderstanding of sending email, so any help is appreciated!","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":455,"Q_Id":55912101,"Users Score":1,"Answer":"In the test environment, you can send messages e-mail only to address registered in sandbox.","Q_Score":0,"Tags":"python,django,email,amazon-ses","A_Id":55912134,"CreationDate":"2019-04-29T23:40:00.000","Title":"Send email via SES","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to read a csv file just after running server. It can't be done in any view because it need to be preload to execute all views, so I need to do it immediately after \"manage.py runserver\". Is there any file where I can write the code that I need to execute in first place?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":3300,"Q_Id":55940630,"Users Score":-1,"Answer":"Just add that script in settings.py file. Because settings.py file of those files which are executed prior to views.py file","Q_Score":0,"Tags":"python,django,python-3.x","A_Id":55940662,"CreationDate":"2019-05-01T18:08:00.000","Title":"How to execute code automatically after manage.py runserver","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm currently developing HTTP Rest API server using Flask. I don't have any static media, and all url are being served by @app.route pattern in Flask Framework. Can Flask run on Gunicorn alone with out webserver?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":473,"Q_Id":55949849,"Users Score":1,"Answer":"Flask - logic to respond to HTTP request\ngunicorn - Helps manage concurrency for these HTTP requests, logging, worker timeouts\nnginx - scalability and protection. If the load for your application is higher, Nginx would help for load balancing without crashing your Application Server, helps to serve static content if any\n\nSo if load for your application is less and no static content to serve, in my opinion, flask + gunicorn should be OK.","Q_Score":1,"Tags":"python,flask,webserver,gunicorn,wsgi","A_Id":57334871,"CreationDate":"2019-05-02T09:53:00.000","Title":"Can flask rest api application can run on gunicorn alone?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My SQS is supposed to trigger a Lambda function once. It seems to trigger it repeatedly and I cannot find the cause.\nHere's how the system works:\n\nFile is uploaded to S3 bucket (we'll call it uploaded-docs).\nUploading a file to uploaded-docs\/input\/ triggers an event on the bucket, called FileUploaded.\nEvent FileUploaded triggers a Lambda function called ProcessUploadedFile.\nProcessUploadeFile calls Textract to analyze a document. The output of said Textract process is published (when finished) to an SNS Topic called TextractComplete.\nTextractComplete has one subscription, the SQS called TextractOutputQueue.\nTextractOutputQueue triggers a Lambda function called GetOutput. It's only supposed to run once for each file uploaded\n\nI've noticed that when a file is uploaded, GetOutput is called over and over on the file and Task timed out after 3 seconds (Textract's GetDocumentTextDetection command called via boto3) can be found in the logs until it finally exceeds.\nI also noticed that when a new file is uploaded, all the files in the bucket are called again in this process.\nSome hypotheses:\n\nThe SQS queue items aren't being \"consumed\", such that they still exist in the queue after calling their respective Lambda functions, and because they still exist, they keep invoking the function.\nThe Lambda GetOutput is stuck in some sort of retry loop, and every time it times out, it calls the entire function again. This doesn't explain why the logs will be dead until I upload another document, and all the previously-uploaded documents enter the loop again somehow.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1110,"Q_Id":55958046,"Users Score":2,"Answer":"Thanks to all that commented, it was a very simple fix. Just increase the timeout of GetOutput to 10 seconds and the issue stopped.","Q_Score":2,"Tags":"python-3.x,amazon-web-services,aws-lambda,amazon-sqs","A_Id":55959036,"CreationDate":"2019-05-02T18:13:00.000","Title":"SQS triggers Lambda function over and over again, why?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Problem Solved - Thanks to everyone who invested his\/her time in looking after it.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":33,"Q_Id":55958060,"Users Score":1,"Answer":"You have two URLs pointing to the same view. Only smaakjes_list will ever be called; it does not pass a list (or any variables at all). index will never ever be used.\nI'm not sure why you have done this. Give your views separate URLs. Or just delete the smaakjes_list view and its corresponding URL pattern.","Q_Score":0,"Tags":"django,python-3.x,for-loop,django-templates,django-views","A_Id":55958113,"CreationDate":"2019-05-02T18:14:00.000","Title":"How do we pass values - from a list in views.py - to html","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am developing web applications, APIs, and backends using the Django MVC framework. A major aspect of Django is its implementation of an ORM for models. It is an exceptionally good ORM. Typically when using Django, one utilizes an existing interface that maps one's Django model to a specific DBMS like Postgres, MySQL, or Oracle for example.\nI have some specific needs, requirements regarding performance and scalability, so I really want to use AWS's Dynamo DB because it is highly cost efficient, very performant, and scales really well.\nWhile I think Django allows one to implement their own interface for a DBMS if one wishes to do so, it is clearly advantageous to be able to use an existing DBMS interface when constructing one's Django models if one exists.\nCan someone recommend a Django model interface to use so I can construct a model in Django that uses AWS's Dynamo DB?\nHow about one using MongoDB?","AnswerCount":5,"Available Count":3,"Score":0.0399786803,"is_accepted":false,"ViewCount":17688,"Q_Id":55976471,"Users Score":1,"Answer":"DynamoDB is non-relational which I think makes it architecturally incompatible with an ORM like Django's.","Q_Score":13,"Tags":"python,django,orm,nosql,amazon-dynamodb","A_Id":61207563,"CreationDate":"2019-05-03T20:08:00.000","Title":"How can I use AWS's Dynamo Db with Django?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am developing web applications, APIs, and backends using the Django MVC framework. A major aspect of Django is its implementation of an ORM for models. It is an exceptionally good ORM. Typically when using Django, one utilizes an existing interface that maps one's Django model to a specific DBMS like Postgres, MySQL, or Oracle for example.\nI have some specific needs, requirements regarding performance and scalability, so I really want to use AWS's Dynamo DB because it is highly cost efficient, very performant, and scales really well.\nWhile I think Django allows one to implement their own interface for a DBMS if one wishes to do so, it is clearly advantageous to be able to use an existing DBMS interface when constructing one's Django models if one exists.\nCan someone recommend a Django model interface to use so I can construct a model in Django that uses AWS's Dynamo DB?\nHow about one using MongoDB?","AnswerCount":5,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":17688,"Q_Id":55976471,"Users Score":0,"Answer":"There is no Django model interface for AWS DynamoDB, but you may retrieve data from that kind of db using boto3 software provided by AWS.","Q_Score":13,"Tags":"python,django,orm,nosql,amazon-dynamodb","A_Id":58988747,"CreationDate":"2019-05-03T20:08:00.000","Title":"How can I use AWS's Dynamo Db with Django?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am developing web applications, APIs, and backends using the Django MVC framework. A major aspect of Django is its implementation of an ORM for models. It is an exceptionally good ORM. Typically when using Django, one utilizes an existing interface that maps one's Django model to a specific DBMS like Postgres, MySQL, or Oracle for example.\nI have some specific needs, requirements regarding performance and scalability, so I really want to use AWS's Dynamo DB because it is highly cost efficient, very performant, and scales really well.\nWhile I think Django allows one to implement their own interface for a DBMS if one wishes to do so, it is clearly advantageous to be able to use an existing DBMS interface when constructing one's Django models if one exists.\nCan someone recommend a Django model interface to use so I can construct a model in Django that uses AWS's Dynamo DB?\nHow about one using MongoDB?","AnswerCount":5,"Available Count":3,"Score":0.0798297691,"is_accepted":false,"ViewCount":17688,"Q_Id":55976471,"Users Score":2,"Answer":"You can try Dynamorm or pynamoDB. I haven't tried them maybe they can help.","Q_Score":13,"Tags":"python,django,orm,nosql,amazon-dynamodb","A_Id":62535835,"CreationDate":"2019-05-03T20:08:00.000","Title":"How can I use AWS's Dynamo Db with Django?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am building a web application that contains calculators for various industries. I am using html and css for the layout(color, size, etc). However, the core funtionality like arithmetic operations will be done using pure python programming and not javascript. So I will have html, css, and python files. Question is - how can I link my python file to html?","AnswerCount":6,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":16626,"Q_Id":55978136,"Users Score":0,"Answer":"You can use Brython\n\nBrython is designed to replace Javascript as the scripting language for the Web. As such, it is a Python 3 implementation (you can take it for a test drive through a web console), adapted to the HTML5 environment, that is to say with an interface to the DOM objects and events.","Q_Score":1,"Tags":"python,html,css,web-applications","A_Id":65466066,"CreationDate":"2019-05-03T23:19:00.000","Title":"Integrating html, css, and python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Changing url(r'', include('application.urls')) to url(r'^store\/', include('application.urls')) causes login redirect url to fail from checkout from cart as anonymous user. \nI have included LOGIN_REDIRECT_URL = '\/store\/accounts\/' in settings.py. \nThis fixes the direct login redirect url.\nHowever if an anonymous user tries to add product to cart, it is supposed to redirect to login page \/store\/accounts\/login\/?next=\/store\/checkout\/ but it redirects to \/accounts\/login\/?next=\/store\/checkout\/.\nWhat is the workaround to fix this without breaking anything?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":205,"Q_Id":55981654,"Users Score":2,"Answer":"LOGIN_URL = '\/store\/accounts\/login\/'\nAdding this line in settings.py fixed the problem.","Q_Score":0,"Tags":"python,django,e-commerce,django-oscar","A_Id":55981688,"CreationDate":"2019-05-04T10:34:00.000","Title":"How to fix Django Oscar application.urls, when changed to custom path (\/store) breaks login redirect link from checkout","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a flutter text entry field. I want to send this text_entry and username to a flask API. The text field may contain latex symbols. Now the flask API will return an HTML file with custom CSS and that text-entry written on it among other things which I can now view in my web browser. I want to webview that returned html file from flutter widget. How to implement it ?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":391,"Q_Id":55991871,"Users Score":1,"Answer":"Add the http package.\nMake a network request using the http package.\nConvert the response into a custom Dart object.\nFetch and display the data with Flutter.","Q_Score":1,"Tags":"python,flask,webview,flutter","A_Id":57946098,"CreationDate":"2019-05-05T12:21:00.000","Title":"Send text data from flutter to flask api and webview the returned html","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have to execute a .py file (python file) saved on my local machine (say @C:\\User\\abc\\dosomething.py) from postman from its pre-request section.\nEssentially I need to call the .py file from javascript code but from postman only.\nHow do I do that ?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2506,"Q_Id":56002752,"Users Score":0,"Answer":"Unfortunately this is not possible. The Pre-request and test-scripts are executed in a sandbox environment.","Q_Score":1,"Tags":"python-2.7,postman","A_Id":56004157,"CreationDate":"2019-05-06T09:52:00.000","Title":"How to execute python script from postman?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a website host on google cloud engine. I use Python Pyramid framework and jinja2.\nWhen I update profile image, image was upload successfull but image is not show .\nIf i run sudo python3.6 setup.py install and restart web server again. The profile image will be show .\nPS : I use mod_wsgi and apache2, not use virtual env\nI don't know why, anybody can help me.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":111,"Q_Id":56013658,"Users Score":0,"Answer":"If i use\n$sudo python3.6 setup.py develop\nthen upload image was work fine for me.\nWhat the difference between setup.py install and setup.py develop","Q_Score":0,"Tags":"python,pyramid","A_Id":56013854,"CreationDate":"2019-05-06T23:41:00.000","Title":"Python pyramid setup.py install","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a SOAP url , while running the url through browser I am getting a wsdl response.But when I am trying to call a method in the response using the required parameter list, and it is showing \"ARERR [149] A user name must be supplied in the control record\".I tried using PHP as well as python but I am getting the same error.\nI searched this error and got the information like this : \"The name field of the ARControlStruct parameter is empty. Supply the name of an AR System user in this field.\".But nowhere I saw how to supply the user name parameter.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1235,"Q_Id":56016625,"Users Score":0,"Answer":"I got the solution for this problem.Following are the steps I followed to solve the issue (I have used \"zeep\" a 3rd party module to solve this):\n\nRun the following command to understand WSDL:\n\npython -mzeep wsdl_url\n\nSearch for string \"Service:\". Below that we can see our operation name\nFor my operation I found following entry:\n\nMyOperation(parameters..., _soapheaders={parameters: ns0:AuthenticationInfo})\nwhich clearly communicates that, I have to pass parameters and an auth param using kwargs \"_soapheaders\"\nWith that I came to know that I have to pass my authentication element as _soapheaders argument to MyOperation function.\n\nCreated Auth Element:\n\nauth_ele = client.get_element('ns0:AuthenticationInfo')\nauth = auth_ele(userName='me', password='mypwd')\n\nPassed the auth to my Operation:\n\ncleint.service.MyOperation('parameters..', _soapheaders=[auth])","Q_Score":0,"Tags":"php,python,web-services,soap,wsdl","A_Id":56127550,"CreationDate":"2019-05-07T06:21:00.000","Title":"Getting ARERR 149 A user name must be supplied in the control record","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I wish to have a touchsensor on the end of a moving arm. However, through the Python API, getDevice('touch_sensor') only returns sensors that are directly under the Robot parent. \nIs there a way I can either get a sensor that is nested (under a joint), or instead make a sensor that is under parent move in tandem with another joint?\nI have tried setting the bounding box of the sensor to a shape\/transform nested under the moving joint, but it simply takes on the original position of the shape and doesn't update when the joint moves.\nI have also tried putting the sensor directly under the joint, in which case it does indeed move, but then I cannot access it from the python API. (Using get device returns None)","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":143,"Q_Id":56022689,"Users Score":2,"Answer":"Found the problem, I should have used getTouchSensor instead of getDevice!!\nNow it works fine.","Q_Score":0,"Tags":"python,sensors,webots","A_Id":56023750,"CreationDate":"2019-05-07T12:29:00.000","Title":"How to get TouchSensor nested under joint in Webots (Python API)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Requirement:\n\nSending mail via SMTP(only via SMTP for specific reason) to the user which is read through event \"RunInstances\" from cloud-trail.\nAs SMTP code is not working with lambda I will have to kept inside EC2 and trigger it through lambda.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":512,"Q_Id":56025709,"Users Score":1,"Answer":"There are few options:\n\nUse SQS: Use Lambda to send messages to SQS, add workers in your EC2s to consume the messages.\nCreate a server in EC2 that listens to traffic from a port, for example: 80. Use Lambda to send HTTP requests to the EC2 server.\n(Not recommended for this case): Use Step Function Activity. Lambda to call step function, passes the input which is email content. The step function will run and create an activity. The EC2 instance will then have a worker implemented that keep polling activities from the Step function.","Q_Score":0,"Tags":"python,amazon-ec2,aws-lambda,boto3","A_Id":56031606,"CreationDate":"2019-05-07T15:15:00.000","Title":"Is there any way to trigger code inside EC2 from Lambda?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to deploy my Django and spaCy project to Heroku. But I am getting an error: No matching distribution found for en-core-web-sm (It is an ML model downloadable via pip). How can I solve this problem? The model is installed locally in a virtual environment and working alright. I got the requirements file via pip freeze. I am using Python 3.6.4.","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":4869,"Q_Id":56028694,"Users Score":0,"Answer":"I found an alternative to install en_core_web_sm on Heroku and have not found any side effects yet, which is editing the Profile in this way:\n\nweb: sh setup.sh && python -m spacy download en_core_web_sm && streamlit run app.py\n\nJust tell me if everyone finds it is not available anymore.","Q_Score":8,"Tags":"python,django,heroku,spacy","A_Id":63368463,"CreationDate":"2019-05-07T18:40:00.000","Title":"Heroku Deployment Error: No matching distribution found for en-core-web-sm","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm starting to work with Django, already done some models, but always done that with 'code-first' approach, so Django handled the table creations etc. Right now I'm integrating an already existing database with ORM and I encountered some problems. \nDatabase has a lot of many-to-many relationships so there are quite a few tables linking two other tables. I ran inspectdb command to let Django prepare some models for me. I revised them, it did rather good job guessing the fields and relations, but the thing is, I think I don't need those link tables in my models, because Django handles many-to-many relationships with ManyToManyField fields, but I want Django to use that link tables under the hood.\nSo my question is: Should I delete the models for link tables and add ManyToManyFields to corresponding models, or should I somehow use this models?\nI don't want to somehow mess-up database structure, it's quite heavy populated.\nI'm using Postgres 9.5, Django 2.2.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":217,"Q_Id":56045891,"Users Score":0,"Answer":"In many cases it doesn't matter. If you would like to keep the code minimal then m2m fields are a good way to go. If you don't control the database structure it might be worth keeping the inspectdb schema in case you have to do it again after schema changes that you don't control. If the m2m link tables can grow properties of their own then you need to keep them as models.","Q_Score":0,"Tags":"python,django,many-to-many,django-orm","A_Id":56046079,"CreationDate":"2019-05-08T17:12:00.000","Title":"Handling many-to-many relationship from existing database using Django ORM","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I don't quite understand how this works, and I've been searching everywhere but didn't quite find the answer. \nSo when I deploy a django app on heroku the other day I was using daphne with this in the Procfile : \ndaphne app.asgi:application --port $PORT --bind 0.0.0.0 -v2\nThe app works just fine and it make sense (I heard that heroku dynamically assigns the port). But how does the following code knows how to bind it's port, isn't it always 8000 by default ?\n\ngunicorn app.asgi\n\nSorry for the silly question. I'm a newbie in devops stuff","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":83,"Q_Id":56055124,"Users Score":0,"Answer":"No, the port is whatever Heroku wants it to be. Since they're running many many sites, they need to dynamically choose a port to serve each one on. They provide that port in the PORT environment variable, and the Procfile takes that value and binds gunicorn to it.","Q_Score":0,"Tags":"python,django,heroku,gunicorn","A_Id":56055931,"CreationDate":"2019-05-09T08:22:00.000","Title":"What is gunicorn app.wsgi actually doing in heroku?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am trying to learn HTML transformations performed by a certain service using machine learning. I have broken down my problem into a pattern matching problem. For now I am trying to learn pattern in which tags are transformed. For example, for same data I have this pattern in original HTML \"html, body, div, h1\" and following pattern in transformed page \"html, body, div, div, div\". I have 14000 such data points and I want to train a model that would take as input patterns from original page and output transformed patterns. I have looked into a few NLP model but either I have failed to understand them completely or they were not very helpful.\nIf someone could give me any pointers or preferably suggest some python based model that would be great.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":61,"Q_Id":56066929,"Users Score":0,"Answer":"your question is not clear enough to help you with some answer but still from what I was able to figure out your input will be html tags in a string pattern & your output too is a string pattern of html tags.\nYou can use a bi-directional LSTM or CRF for this kind of task. Read about them and you'll have a clear idea.\nBut if same input pattern is giving multiple output pattern then it will be difficult for most ML algos to learn. You can remove those data points and you'll be good to go.","Q_Score":0,"Tags":"python,machine-learning","A_Id":56236394,"CreationDate":"2019-05-09T20:16:00.000","Title":"A machine learning model for matching pattern between two sets of strings?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to make a program that can be able to make a search request on most websites such as YouTube, ESPN, My university course timetable etc... \nI have looked online for various solutions but many of them point to simply adding your search query at the end of the url you are \"getting\", but that doesn't seem to work with all websites some of them don't update their URL's when you manually make a search, while many others might give each and every URL a unique 'id'. Would it be possible to scrape a search bar from any website and then specifying a search query and entering it? Is there a function for that?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":557,"Q_Id":56075283,"Users Score":0,"Answer":"It's possible to use a text-based web browser and automate the search with a script. Then you can download the site you get from this browser and scrape it with BeautifulSoup or something else.","Q_Score":0,"Tags":"python,beautifulsoup,request,python-requests","A_Id":56075364,"CreationDate":"2019-05-10T10:02:00.000","Title":"Is there any way to scrape a search box using BeautifulSoup\/requests and then search and refresh?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to make a program that can be able to make a search request on most websites such as YouTube, ESPN, My university course timetable etc... \nI have looked online for various solutions but many of them point to simply adding your search query at the end of the url you are \"getting\", but that doesn't seem to work with all websites some of them don't update their URL's when you manually make a search, while many others might give each and every URL a unique 'id'. Would it be possible to scrape a search bar from any website and then specifying a search query and entering it? Is there a function for that?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":557,"Q_Id":56075283,"Users Score":1,"Answer":"You need to Use Selenium Instance to do that. You can not achieve it using BeautifulSoup or requests.","Q_Score":0,"Tags":"python,beautifulsoup,request,python-requests","A_Id":56075496,"CreationDate":"2019-05-10T10:02:00.000","Title":"Is there any way to scrape a search box using BeautifulSoup\/requests and then search and refresh?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Error creating Django application: Error on python side. Exit code: 1, err: CommandError: 'untitled1' conflicts with the name of an existing Python module and cannot be used as a project name. Please try another name.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":464,"Q_Id":56086881,"Users Score":0,"Answer":"uninstall django and delete you directories then install again you can do this on cl: pip uninstall django\nthen cl: pip install django\nhopefully this should work","Q_Score":1,"Tags":"python,django,python-3.x,pycharm","A_Id":56097701,"CreationDate":"2019-05-11T03:15:00.000","Title":"How to fix module name conflict in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Error creating Django application: Error on python side. Exit code: 1, err: CommandError: 'untitled1' conflicts with the name of an existing Python module and cannot be used as a project name. Please try another name.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":464,"Q_Id":56086881,"Users Score":0,"Answer":"which version of python are you using? upgrade your version of django or downgrade your version of python and this should solve the problem.\nyou can do in cl:  python --version\nif you are using a newer version of python to run a project in \ncl: alias python='python3'\nThis should work if you have the correct setup","Q_Score":1,"Tags":"python,django,python-3.x,pycharm","A_Id":56087455,"CreationDate":"2019-05-11T03:15:00.000","Title":"How to fix module name conflict in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Currently, I am learning Django and I am wondering why most courses use sessions for shopping carts instead of storing them to the database.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":33,"Q_Id":56094677,"Users Score":0,"Answer":"Sessions are relative to the user's current session and it may be convenient to erase all history in case the session expired\/ user is logged out.","Q_Score":0,"Tags":"python,django","A_Id":56095890,"CreationDate":"2019-05-11T22:15:00.000","Title":"Why use sessions for shopping carts?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a script that reads from a google sheet and uses the information to create tickets using the Jira python api. In my situation it won't work to have the script be triggered at a certain time, the script has to be triggered through the sheet. Is there some way to detect a button press or a cell change which runs my local python file?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":948,"Q_Id":56107330,"Users Score":1,"Answer":"I had a similar problem. \nthere is a tool set call 'gspread', which can read from python data from your Google sheets.\nWhat I did is a script in the spread sheet, what filled a cell with \"Start + time\". You can trigger script with this with a button.\nNow the python program read this cell every minute. If the cell contains the start trigger, if fires the python script. \nNot the nicest solution, but it works for a few years now.","Q_Score":2,"Tags":"python,python-3.x,google-sheets","A_Id":56109784,"CreationDate":"2019-05-13T07:11:00.000","Title":"Is it possible to run a python script from google sheets on a button press?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm currently working on a project that involves crawling data from various (about 50 websites). There is one website which has multiple pages we need to scrape, but this website doesn't allow multiple session. (the website is authenticated). \nIs there a way to pause the one spider until the other one is finished?\nI've been researching this for the past day. I found some ways you can pause, but it seems these are only working for the whole CrawlerProcess.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":56,"Q_Id":56114106,"Users Score":0,"Answer":"The solution was actually fairly easy. Each spider has a unique identifying code. When setting the CrawlerProcess up, the program checks if the unique code is the same as the one that needs pausing, and if so, it passes the spider instance to the spider that needs to run first, which will then pause it with self.custom_settings['XX_SPIDER'].crawler.pause() and when done, in the closed() function, will unpause it with self.custom_settings['XX_SPIDER'].crawler.unpause()","Q_Score":0,"Tags":"python,scrapy","A_Id":56518384,"CreationDate":"2019-05-13T14:07:00.000","Title":"Pausing individual spiders in a CrawlerProcess","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to render a image to a docx template which has a jinja hook in it.\nI am using inlineImage method from docx template using this I was able to render image it is opening in libreoffice writer but not in msword where it should be really using.\nIn msword a image is rendered but not shown just a blank area is shown.\nI do even tried using the subdoc method it is also giving me same results.\nPlease do help me understand what am doing wrong.\nI am using python-docx 0.8.7 and docxtemplate 0.5.17 library to achieve the result\nI am bound to use these versions since docxtemplate enforced to use this version of python-docx","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":955,"Q_Id":56116387,"Users Score":1,"Answer":"I am posting this as an answer so that it may help others trying to achieve the same.\nIn my code i was using NamedTemporaryFile(delete=None) to create the image before I pass the value to inlineimage as InlineImage(template, tmpfile.name) Which was causing the Issue , I remodelled my logic to directly add the image after doing some resize based on image aspect ratio and send the path of the image instead of filename into the InlineImage method and it worked like a charm.","Q_Score":2,"Tags":"python-3.5,doc","A_Id":56123476,"CreationDate":"2019-05-13T16:26:00.000","Title":"Python docx image rendering using docx template library","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am developing a simple web server that runs on a raspberry pi zero and lights up an LED when a request is received on the POST route (with a given color, intensity, blink timing and other informations contained in the request data) and shuts it down when a request is received on the DELETE route.\nI wanted to have a sort of backup of the requests i do to the server so that they can be \"redone\" (in whatever order) when the server restarts so that the LEDs will turn on without having to redo all of them by hand.\nRight now (since it was the easiest and fasted way for me to do it as a proof of concept) every time i make a POST request i save the color in a dict using as key the serial of the LED and then write the dict to a json file.\nWhen i receive a DELETE request i read the file, delete the entry and write it again with the other information that it may contain (if more than one LED was connected), if the server loses power or gets shut down and restarts it reads the file and restores the LEDs statuses.\nI was wondering what would be the best way to have a system like this (either using a file, DB or other possible solutions) in a way that would use the lowest amount of RAM possible since I already have other services running on the rpi that use quite a bit of it.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":30,"Q_Id":56132088,"Users Score":0,"Answer":"Depending on how many LEDs there are it sounds like what you are doing will be a JSON file of only a few bytes, right?  There are ways you could compress that, but unless you have a huge number of LEDs I doubt it will be a significant saving compared to everything else.","Q_Score":0,"Tags":"python,database,raspberry-pi,ram","A_Id":56133167,"CreationDate":"2019-05-14T13:51:00.000","Title":"Saving data using less RAM possible","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am looking for a solution, to deploy my Django app on my Unlimited Linux Shared Hosting Plan on Hostgator.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":442,"Q_Id":56136153,"Users Score":1,"Answer":"Is it possible ? Yes \nIs it recommendable? No\nas it says on the same hostgator page:\n\nWhile it is possible to install Django on HostGator servers, it is not a supported application\n\nThis means that hostgator is not designed to host django. My recommendation would be:\nIf it is a simple project: Use Heroku\nIf it's a project that might later become something bigger: Use google app engine (google cloud) or Elastic beanstalk(AWS)","Q_Score":0,"Tags":"python,django","A_Id":56136463,"CreationDate":"2019-05-14T18:05:00.000","Title":"Is it possible to deploy a Django website using HostGator shared Linux Web Hosting?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"While running test cases built in the Robot Framework, at some point, the error \u201cPython stopped\u201d appears and I have observed that numerous chrome processes linger per Task Manager even when my test case closes all browser and performs a taskkill command.  As a result, my testing is suspended with aborting the only option.\nBackground and tech stack:\n\nwindows 7\/Windows 10\nPython 2.7.15\/RobotFramework\n\"scoped_dir*\" directories fill up the disk space\nChrome v74\/chromedriver v74\nChrome setting turned off:\n    Continue running background apps when Google Chrome is closed\nCommand line taskkill does not always work so only option is to end chrome process in Task Manager.\n\nTest Setup      Run | taskkill \/f \/t \/im chrome.exe\nTest Teardown   Run | taskkill \/f \/t \/im chrome.exe\nOpen Browser\n......\nClose Browser\nExpected result:  chrome process stops running after each test case is executed and all C:\\Users\\<user_name>\\AppData\\Local\\Temp\\scoped_dirXXXXX directories are deleted.\nActual result: \"Python stopped\" is displayed; more often than not, numerous chrome processes linger and scoped_dir* fills up the file system.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":400,"Q_Id":56138502,"Users Score":0,"Answer":"I have already tried the taskkill command on chromedriver.exe and that does not work.\nI have increased the RAM on the computer and that does not work.\nI am running smaller suites of tests and that is working now.","Q_Score":0,"Tags":"python,robotframework","A_Id":56242134,"CreationDate":"2019-05-14T20:58:00.000","Title":"Python stops and chrome processes linger","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"While running test cases built in the Robot Framework, at some point, the error \u201cPython stopped\u201d appears and I have observed that numerous chrome processes linger per Task Manager even when my test case closes all browser and performs a taskkill command.  As a result, my testing is suspended with aborting the only option.\nBackground and tech stack:\n\nwindows 7\/Windows 10\nPython 2.7.15\/RobotFramework\n\"scoped_dir*\" directories fill up the disk space\nChrome v74\/chromedriver v74\nChrome setting turned off:\n    Continue running background apps when Google Chrome is closed\nCommand line taskkill does not always work so only option is to end chrome process in Task Manager.\n\nTest Setup      Run | taskkill \/f \/t \/im chrome.exe\nTest Teardown   Run | taskkill \/f \/t \/im chrome.exe\nOpen Browser\n......\nClose Browser\nExpected result:  chrome process stops running after each test case is executed and all C:\\Users\\<user_name>\\AppData\\Local\\Temp\\scoped_dirXXXXX directories are deleted.\nActual result: \"Python stopped\" is displayed; more often than not, numerous chrome processes linger and scoped_dir* fills up the file system.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":400,"Q_Id":56138502,"Users Score":0,"Answer":"Try killing the \"Chromedriver.exe\" as Robot framework uses chromedriver to interact with the chrome browser with the help of functions defined in back-end(Selenium library).\nTry below Command in Test Setup\ntaskkill \/f \/t \/im chromedriver.exe","Q_Score":0,"Tags":"python,robotframework","A_Id":56145675,"CreationDate":"2019-05-14T20:58:00.000","Title":"Python stops and chrome processes linger","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I built a website some time ago with Flask. Now all of a sudden when I try to navigate there I get the following:\nNET::ERR_CERT_COMMON_NAME_INVALID\nYour connection is not private\nAttackers might be trying to steal your information from www.mysite.org (for example, passwords, messages, or credit cards). Learn more\nDoes anyone know what's going on?","AnswerCount":3,"Available Count":1,"Score":0.1325487884,"is_accepted":false,"ViewCount":5243,"Q_Id":56138678,"Users Score":2,"Answer":"The error means: The host name you use in the web browser does not match the one used in the certificate.\nIf your server has multiple DNS entries you need to include all of into the certificate to be able to use them with https. If you access the server using it's IP address like https:\/\/10.1.2.3 then the IP address also have to present in the certificate (of course this only makes sense if you have a static IP address that never changes).","Q_Score":3,"Tags":"python,flask,error-handling","A_Id":68351111,"CreationDate":"2019-05-14T21:13:00.000","Title":"NET::ERR_CERT_COMMON_NAME_INVALID - Error Message","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Hello I am a developper of a django project and I have to check that my dev is okay. \nTo do this, I have to connect myself as a user but I have just his email not his password. I found in the table User this the email and the password but the password begins by this : pbkdf2_sha256 ...\nSo I guess the password is encrypted. Is there a way easier to do this ? \nThank you for your help !","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":236,"Q_Id":56145257,"Users Score":1,"Answer":"Depending on how the passwords are hashed while new users are created, you could just replace the user's hash with another one : \n\nGo in database and copy the passwordHash of the user you would like to log with\nStore this hash somewhere (you will need it to revert the change)\nCopy the hash of another user (a user for whom you know the password)\nPaste the hash of this user in place of the hash of the user you want to log in\n\nIf the hashs are generated the same way, you will be able to log with the other user's password.\nThen when you are done, revert the changes in database.\nHope it helps.","Q_Score":0,"Tags":"python,django,python-3.x,django-users,pbkdf2","A_Id":56148509,"CreationDate":"2019-05-15T08:54:00.000","Title":"How can I connect myself as an other user?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have successfully implemented google assistant on rpi using gassistpi and added agent on dialogflow also. The issue is that if multiple users invoke google assistant on different raspberry pi I am not able to identify which user has invoked the action as request from webhook on dialogflow doesn't have any user identity information. Thus, I am facing issues while retrieving data for particular user.\nI tried using account linking on actions on google using google signup over voice but I am unable to implement that.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":174,"Q_Id":56150206,"Users Score":1,"Answer":"The Google Assistant SDK does not have voice match as a feature, so you would be unable to use it to identify individual users of the Action on that surface.","Q_Score":0,"Tags":"python-3.x,dialogflow-es,actions-on-google,google-assistant-sdk","A_Id":56153506,"CreationDate":"2019-05-15T13:09:00.000","Title":"check identity of multiple users on actions on google","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"When I run my Qt application I get the message \n\nQt WebEngine seems to be initialized from a plugin. Please set\n  Qt::AA_ShareOpenGLContexts using QCoreApplication::setAttribute before\n  constructing QGuiApplication.\n\nThe app runs fine regardless of the fact that this is getting dumped to the terminal. I cant seem to find the root cause or really understand what this message is trying to tell me. What is this message saying and how can I fix it?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":7357,"Q_Id":56159475,"Users Score":0,"Answer":"Using PySide6 instead of PySide2 solved my problem with python 3.9 and QT 5.15 if it can help","Q_Score":9,"Tags":"python,pyside2,qtwebengine","A_Id":67457543,"CreationDate":"2019-05-16T01:06:00.000","Title":"Qt WebEngine seems to be initialized","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a node.js server running on a Raspberry Pi 3 B+. (I'm using node because I need the capabilities of a bluetooth library that works well). \nOnce the node server picks up a message from a bluetooth device, I want it to fire off an event\/command\/call to a different python script running on the same device.\nWhat is the best way to do this? I've looked into spawning child processes and running the script in them, but that seems messy... Additionally, should I set up a socket between them and stream data through it? I imagine this is done often, what is the consensus solution?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":149,"Q_Id":56178165,"Users Score":1,"Answer":"Running a child process is how you would run a python script. That's how you do it from nodejs or any other program (besides a python program).\nThere are dozens of options for communicating between the python script and the nodejs program. The simplest would be stdin\/stdout which are automatically set up for you when you create the child process, but you could also give the nodejs app a local http server that the python script could communicate with or vice versa. \nOr, set up a regular socket between the two. \nIf, as you now indicate in a comment, your python script is already running, then you may want to use a local http server in the nodejs app and the python script can just send an http request to that local http server whenever it has some data it wants to pass to the nodejs app.  Or, if you primarily want data to flow the opposite direction, you can put the http server in the python app and have the nodejs server send data to the python app.\nIf you want good bidirectional capabilities, then you could also set up a socket.io connection between the two and then you can easily send messages either way at any time.","Q_Score":0,"Tags":"python,node.js,raspberry-pi","A_Id":56192507,"CreationDate":"2019-05-17T00:38:00.000","Title":"Get nodejs server to trigger a python script","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"i'm using odoo 11 and i want to know how can I configure odoo in a way that the HR manager and the employee received alert before the expiration of  contract.\nIs it possible to do it ? Any idea for help please ?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":70,"Q_Id":56187289,"Users Score":0,"Answer":"This type of scenario is only archived by developing custom addon.\nIn custom addon you have to specify cron file which will automatically fire some action at regular basis, and which will send email notification to HR Manager that some of employee's contract are going to be expired.","Q_Score":0,"Tags":"python-3.x,odoo-11","A_Id":56493033,"CreationDate":"2019-05-17T13:19:00.000","Title":"How to configure alerts for employee contract expiration in odoo 11?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I know that the file db.sqlite3 in Django holds the entire database and the entire content within it. Is it safe to keep all the project files, the *.py files, the migrations files, but replace the db.sqlite3 file with a different one. If both these db.sqlite3 files work on the same database model, with the same tables, rows, columns, and everything, then if I swap out that file it should work seamlessly.\nI want to copy the original db.sqlite3 file into a different directory. Then I want to create a new db.sqlite3 file in my project. Then I want to work with the new database file, and give it other data to test how the project would work with it. Then I want to delete the new db.sqlite3 file, and I want to restore the old one, which I've saved into another directory.\nWould that work? And how can I create a new db.sqlite3 file, a clean state to put test data into?\nAlso, what if I build my project on another sever, can I copy my old db.sqlite3 file there too, and have the database with all it's saved data restored?\nBasically, the main idea of my question is: are we to treat the db.sqlite3 file as a simple \"text file\" with input\/output data for our program, something that is freely interchangeable?","AnswerCount":2,"Available Count":2,"Score":0.2913126125,"is_accepted":false,"ViewCount":631,"Q_Id":56196650,"Users Score":3,"Answer":"The whole of the database lives in the .db file. You can safely copy it in either direction when there is no process running against the database. If there is a process running against the database then you might see rollback journal files or write-ahead log files in the same directory (if the database is in WAL mode) and if you leave these behind you might risk losing some pending transactions. Closing the database properly generally causes these files to disappear.","Q_Score":1,"Tags":"python,django,sqlite,django-models","A_Id":56196702,"CreationDate":"2019-05-18T06:49:00.000","Title":"Can I arbitrarily replace and restore the db.sqlite3 file?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I know that the file db.sqlite3 in Django holds the entire database and the entire content within it. Is it safe to keep all the project files, the *.py files, the migrations files, but replace the db.sqlite3 file with a different one. If both these db.sqlite3 files work on the same database model, with the same tables, rows, columns, and everything, then if I swap out that file it should work seamlessly.\nI want to copy the original db.sqlite3 file into a different directory. Then I want to create a new db.sqlite3 file in my project. Then I want to work with the new database file, and give it other data to test how the project would work with it. Then I want to delete the new db.sqlite3 file, and I want to restore the old one, which I've saved into another directory.\nWould that work? And how can I create a new db.sqlite3 file, a clean state to put test data into?\nAlso, what if I build my project on another sever, can I copy my old db.sqlite3 file there too, and have the database with all it's saved data restored?\nBasically, the main idea of my question is: are we to treat the db.sqlite3 file as a simple \"text file\" with input\/output data for our program, something that is freely interchangeable?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":631,"Q_Id":56196650,"Users Score":1,"Answer":"Yes, whole sqlite database is contained in one file, so you can freely move, replace, push it with django project (althought it's not recommended) and it will work fine.\nEven if you have 2 different projects with same apps, same model structure and migrations, you can swap them.\nIf you remove your db.sqlite3 and want to create new one, just run python manage.py migrate and it will create new database and apply all migrations.","Q_Score":1,"Tags":"python,django,sqlite,django-models","A_Id":56196701,"CreationDate":"2019-05-18T06:49:00.000","Title":"Can I arbitrarily replace and restore the db.sqlite3 file?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have setup my Django project with Vagrant and everything works well. When I open it in PyCharm in Windows though, I get many reference errors in the code and also \"Package requirements are not satisfied\" prompts to install libraries. The problem is, these are already installed in virtual environment (I know because otherwise the project wouldn't work at all). \nIs there any way to let PyCharm know that these dependencies are already installed, and let it know where to find them? \nI have already added the project interpreter in project settings to the one under the \/venv directory of my project.","AnswerCount":1,"Available Count":1,"Score":-0.1973753202,"is_accepted":false,"ViewCount":48,"Q_Id":56203235,"Users Score":-1,"Answer":"Not enough information. Pycharm is usually clear where the error lies. I'm assuming you correctly entered the path to the python file in the bin directory? \nOtherwise as long as you have requirements.txt just make another environment through Pycharm and try seeing the difference.","Q_Score":0,"Tags":"python,django,pycharm,vagrant","A_Id":56203609,"CreationDate":"2019-05-18T22:12:00.000","Title":"Does PyCharm use dependencies installed in virtual env when accessing the project through Vagrant?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a pretty standard Django project with several apps, each with its own urls, models, forms, etc...\nMy issue is that whenever I make a mistake in my code - e.g. writing a wrong name for a model field in a form \"fields\" attribute - the error raised is always the same:\ndjango.core.exceptions.ImproperlyConfigured: The included URLconf 'myproject.urls' does not appear to have any patterns in it. If you see valid patterns in the file then the issue is probably caused by a circular import.\nI would expect the error message to change according to the error made. This not happening makes everything extremely difficult to debug.\nAny ideas?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":92,"Q_Id":56222594,"Users Score":0,"Answer":"When you run a Django project using runserver, Django loads the URL patterns. Usually, inside your URL patterns you import your views. Which in turn import your models and forms. \nSo if any of these files contains a syntax error or a python error at the top level (see below), this will cause loading the URLs to fail. However, if you scroll up your trace, you should see another error, the actual error that caused the imports to fail. It will say somewhere \"during handling of this exception another exception occurred\".\nHowever, python is not actually running all the code it imports. A class definition will just cause python to read the class name and its attributes (a method is also an attribute). \nWhen python imports a class, it calls its __new__() method, not its __init__() method or any other method you define. So only errors at the top level of the class (e.g. using unknown variables in the definition of attributes) or errors inside the Meta class will be thrown.\n** edit **: fields = ['some_field'] inside the Meta class is indeed run when the class object is created (__new__() method) and Django will check if the field exists in the corresponding model, because it assigns it to the class's _meta attribute.\nIn other cases, when you say \"whenever I make a mistake in my code\" that should generally not raise an error because python should not be actually instantiating the form (running its __init__() method) or running any of the methods you write. So you should avoid instantiating any classes at the top level of your code, instantiation should happen inside of functions\/methods, then python won't hit these errors.\nSo check your views.py files to see if you are just importing form classes (from my_forms import MyForm) or if you are also instantiating a form at the top level of your file (form = MyForm(), note the parenthesis) or as an attribute of a class-based view.","Q_Score":1,"Tags":"python,django","A_Id":56224777,"CreationDate":"2019-05-20T14:03:00.000","Title":"Different bugs always raise the same error: ImproperlyConfigured: The included URLconf 'myproject.urls' does not appear to have any patterns in it","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a shell script that runs some java program on a remote server. \nBut this shell script is to be executed by a python script which is on my local machine.\nHere's the flow : Python script executes the shell script (with paramiko), the shell script then executes a java class. \nI am getting an error : 'The java class could not be loaded. java.lang.UnsupportedClassVersionError:  (Unsupported major.minor version 50.0)' whenever I run python code.\nLimitations: I cannot make any changes to the shell script.\nI believe this is java version issue. But I don't know how to explicitly have a python program to run in a specific java environment.\nPlease suggest how I can get rid of this error.\nThe java version of unix machine (where shell script executes) : 1.6.0\nJava version of my local machine (where python script executes): 1.7.0","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":49,"Q_Id":56232838,"Users Score":1,"Answer":"The shell script can stay the same, update java on the remote system to java 1.7 or later. Then it should work.\nAnother possibility could be to compile the java application for java 1.6 instead. The java compiler (javac) has the arguments -source and -target and adding -source 1.6 -target 1.6 when compiling the application should solve this issue, too (but limits the application to use java 1.6 features).\nAlso be aware: If you use a build system like gradle or maven, then you have a different way to set source and target version.","Q_Score":0,"Tags":"java,python-3.x,sh","A_Id":56232988,"CreationDate":"2019-05-21T07:05:00.000","Title":"Unsupported major.minor version when running a java program from shell script which is executed by a python program","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am wondering what \"as_\" in django query means. I have 1 query: User.objects.filter(username = \"some_username\").as_manager.something but in User model there is no \"as_manager\". Then in some other model called \"Manager\" I got \"something\" which is exactly what is returned. Is it some kind of deep django knowledge that \"as_\" can guide me to other model? Or is it \"as_manager\" somewhere which I cannot spotted.\nI only add that User model extends from django AbstractUser.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":262,"Q_Id":56243658,"Users Score":1,"Answer":"Fair question. I've wondered myself. But, looking through the source code, it only seems to prepend any particular methods\/functions that present the object in certain formats or already defined objects like say:\n\nas_sql\nas_view\nas_table\nas_p\netc...\n\nI don't think it means anything as far as a \"magical\" construct or dynamic function name.","Q_Score":1,"Tags":"python,django,model","A_Id":56243763,"CreationDate":"2019-05-21T17:35:00.000","Title":"What does \"as_\" in django query means?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"When we are writing a pyspark dataframe to s3 from EC2 instance using pyspark code the time taken to complete write operation is longer than usual time. Earlier it used to  take 30 min to complete the write operation for 1000 records, but now it is taking more than an hour. Also after completion of the write operation the context switch to next lines of code is taking longer time(20-30min). We are not sure whether this is AWS-s3 issue or else because of lazy computation of Pyspark. Could anybody throw some light on this quesion.\nThanking in advance","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":75,"Q_Id":56256999,"Users Score":1,"Answer":"It seems an issue with the cloud environment. Four things coming to my mind, which you may check:\n\nSpark version: For some older version of spark, one gets S3 issues.\nData size being written in S3, and also the format of data while storing\nMemory\/Computation issue: The memory or CPU might be getting utilized to maximum levels.\nTemporary memory storage issue- Spark stores some intermediate data in temporary storage, and that might be getting full. \n\nSo, with more details, it may become clear on the solution.","Q_Score":0,"Tags":"python,amazon-web-services,amazon-s3,amazon-ec2,pyspark","A_Id":56291641,"CreationDate":"2019-05-22T12:38:00.000","Title":"writing a pyspark dataframe to AWS - s3 from EC2 instance using pyspark code the time taken to complete write operation is longer than usual time","Data Science and Machine Learning":1,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Watson voice assistant instance connected using SIP trunk to a Twilio API. I want to enable to the IBM Speech-To-Text add-on from the Twilio Marketplace which will allow me to obtain full transcriptions of phone calls made to the Watson Assistant bot. I want to store these transcriptions in a Cloudant Database I have created in IBM Cloud. Can I use the endpoint of my Cloudant Database as the callback URL for my Twilio add-on so that when the add-on is activated, the transcription will be added as a document in my Cloudant Database?\nIt seems that I should be able to somehow call a trancsription service through IBM Cloud's STT service in IBM Cloud, but since my assistant is connected through Twilio, this add-on seems like an easier option. I am new to IBM Cloud and chat-bot development so any information is greatly appreciated.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":129,"Q_Id":56265812,"Users Score":0,"Answer":"Twilio developer evangelist here.\nFirst up, I don't believe that you can enable add-ons for voice services that are served through Twilio SIP trunking.\nUnless I am mistaken and you are making a call through a SIP trunk to a Twilio number that is responding with TwiML. In this case, then you can add the STT add-on. I'm not sure it would be the best idea to set the webhook URL to your Cloudant DB URL as the webhook is not going to deliver the data in the format that Cloudant expects.\nInstead I would build out an application that can provide an endpoint to receive the webhook, transform the data into something Cloudant will understand and then send it on to the DB.\nDoes that help at all?","Q_Score":0,"Tags":"twilio,ibm-cloud,cloudant,python-cloudant,ibm-voice-gateway","A_Id":56334855,"CreationDate":"2019-05-22T22:30:00.000","Title":"Can I connect my IBM Cloudant Database as the callback URL for my Twilio IBM STT add-on service?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've implemented a back-end functionality where one can upload a CSV or excel an file and then the server(Django API) will read and save all the data into the database but I feel like it's not the best approach and would like to get advise\nabout this.\nI don't see the reason why the server is required to read and validate the CSV file while it's possible for the client(Angular app) to do that job. The client can read validate the file and the sends the data to the server.\nThen the server will do the rest of the job to save the data into the database. But I've come to think of it, suppose the file contains a million entries this means the server endpoint will be adding a million items. This will cause performance issues. What is the best approach to handle this?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":598,"Q_Id":56270927,"Users Score":0,"Answer":"I implemented an Angular\/Python App that processes large Excel files, even with multiple sheets and the best approach is to let the client upload the file to the server and then your server does the rest of the job.\nThe processing can take a lot of time, so you might need to save the file to a temporary location and process it asynchronously as a job. This job will read your file, process each row and save the data to the database. Optionally, it can also save the progress and job status to the database and so, you can even let the client track the processing progress given the job ID.","Q_Score":1,"Tags":"python,django,angular,client,server-side","A_Id":56271114,"CreationDate":"2019-05-23T08:20:00.000","Title":"How to handle reading, extracting & saving extremely large csv or excel data having an Angular client and a Django server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Django 1.4 operates by default with the database-level autocommit setting off. I have recently tried turning this setting on and it has slowed down my test suite considerably. \nDATABASES['default']['OPTIONS'].update({'autocommit': True})\nMy understanding is that now every call to create, save etc. by default opens a transaction and issues a commit statement. Would the cost of all these additional transactions be enough to explain the slow-down of the unit tests? How does the django TestCase transaction behaviour come in to play with this (operating each test within a transaction and rolling back once completed)? Should we expect the performance reduction in the unit tests to be reflective of performance of the views in production?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":79,"Q_Id":56274087,"Users Score":0,"Answer":"The slowed down unit tests were due to the additional cost of opening and committing a transaction with every object created as part of setUp, and did not reflect a slow down in performance in a live environment.","Q_Score":0,"Tags":"python,django,database,postgresql,unit-testing","A_Id":56580803,"CreationDate":"2019-05-23T11:19:00.000","Title":"Why would autocommit in django 1.4 slow down unit tests?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a form where you can input some data, but i want to return the view with a suc6 message and process that data and finally add it to the database.\nI have everything working but if I process the data it doesn't return the view right away and I don't know if its good practice to use a Thread instead of Processing the data in the view.py","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":28,"Q_Id":56293201,"Users Score":0,"Answer":"Depending on your use case. But I would suggest processing the data in view.py because you want to respond with a success message after the processed data is safely stored in database. With thread you might have a problem if your thread breaks after you responded with a success message.","Q_Score":0,"Tags":"python,django","A_Id":56293299,"CreationDate":"2019-05-24T12:59:00.000","Title":"How to process data after a request","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"why do i need a web API to link between django and other JS frameworks for example django with angular?\nAnd is it necessary to build a web API like (REST API) to link between back end and front end?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":41,"Q_Id":56302148,"Users Score":0,"Answer":"Django is not JS library. It's a Python-based server framework. But your JS library communicates with a server via REST Api. So you need a web API to link between django and other JS frameworks.","Q_Score":0,"Tags":"python,django","A_Id":56302620,"CreationDate":"2019-05-25T05:53:00.000","Title":"Why do I need web api to link between django and other js framworks","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"why do i need a web API to link between django and other JS frameworks for example django with angular?\nAnd is it necessary to build a web API like (REST API) to link between back end and front end?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":41,"Q_Id":56302148,"Users Score":0,"Answer":"Without more work than it is worth, the DJango and Angular frameworks probably cannot pass data between one and the other, since both run at the same logical level in the stack.\nREST APIs are the generally accepted mechanism for communicating between SPAs implemented in different frameworks.","Q_Score":0,"Tags":"python,django","A_Id":56302440,"CreationDate":"2019-05-25T05:53:00.000","Title":"Why do I need web api to link between django and other js framworks","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying google cloud's dataflow service which is useful for efficient computation time. My code has the following programming model for the dataflow pipeline:\n\nstart=(p | \"read\" >> beam.io.ReadFromText(\"gcs path\")) \n  end= start | \"data_generation\" >> beam.Pardo(PerfromFunction)\n\nWhat I am doing:\nPerformFunction is a regular Python function which contains a few series of functions for data-generation purpose. My problem is that when I run this function on a regular VM of n1-standard-16 on a single processor, it takes around 1 hour to complete the whole process.\nWhy I opted Dataflow:\nI then decided to go for Dataflow where a ParDo function performs Multi-Threading of the given function and obviously to reduce the computational time from 1 hour to less than 1 hour.\nThe Problem:\nAfter running a Dataflow job with the above-mentioned programming model, I came to realize that Dataflow is still taking around 1 hour to complete the entire process which is mentioned as wall-time on the GCP Dataflow UI. I then logged in to the worker machine and saw the resource utilization using the command htop and found that the machine was only utilizing one processor with 60% average usage.\nExpected Results or Suggestions:\n1. Can multiprocessing be done in the Dataflow worker Cluster?\n2. Is my programming model very limited and wrong?\n3. ParDo function does not seem to reduce the computational time as expected, What do you think I am doing wrong here?\nPS- Owing to some protocols, I can not share the code. Thank you for understanding. Also please correct me if I wrongly understand dataflow at some point.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":249,"Q_Id":56313281,"Users Score":0,"Answer":"Apache Beam, and Dataflow are able to parallelize your computation based on the input that comes into it.\nIf you have a single computation to apply, and this computation takes one hour, then Beam will not be able to speed up your computation. Beam can help you if you need to apply the same computation multiple times to different elements (or data points).\nYou should also consider things such as overhead of running the computation in a distributed fashion (data copying, network calls, etc).\nSo, to be able to answer your question: How may individual \"data points\" (how many lines) are there in your GCS file? Is it possible to parallelize the computation over each one? How long does it take to process each one?","Q_Score":0,"Tags":"python-2.7,google-cloud-platform,google-cloud-dataflow,dataflow","A_Id":56369003,"CreationDate":"2019-05-26T11:58:00.000","Title":"Google Cloud Dataflow: Dataflow programming model taking same computational time as it would take on a regular VM machine?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I need to return some items from inside a spider before starting to parse requests. Because I need to make sure some parent items exist in database before parsing child items.\nI now yield them from the parse method first thing, and this seem to work fine. But I was wondering if there is a better way to do this?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":67,"Q_Id":56315488,"Users Score":1,"Answer":"Instead of yielding the items, write them into the database directly on the constructor of the pipeline where you add regular items to the database.","Q_Score":0,"Tags":"python,scrapy","A_Id":56322104,"CreationDate":"2019-05-26T16:42:00.000","Title":"Scrapy returning items within spider before first request\/parse","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a raw html which i get the room details in which i need to add in a button pop up for a raw html form that can show up \n\u25cb You should be able to add multiple beds for a Room\n           \u00a7 Each Bed entity will have following fields:\n               \u25a1 Width\n               \u25a1 Length\n               \u25a1 Quantity\n               \u25a1 Mattress Type\n                   \u00ae None\n                   \u00ae Innerspring\n                   \u00ae Pillow top\n                   \u00ae Hybrid\n                   \u00ae Specialty foam\n                   \u00ae Gel\n                   \u00ae Memory foam\n                   \u00ae Latex\n                   \u00ae Matress airbed\nMatress waterbed\nwith each click on the +add beds it should show up the html form to add in details and then save all this while saving the Room form.\ndidnt find a better way to approach\nNA\nit must be a raw html with some js or jquery to pop up a html form on click fill in the details and when clicked on add bed it should open another html form and need to add in details and same must show in edit view too.must be able to remove the beds html form if not needed and in the end must save with the room html form.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":32,"Q_Id":56319989,"Users Score":0,"Answer":"Okay, so for that you definatelly need Javascript, or jQuery. On your button add event listener on click. In your html prepare form witch display attribute is set to None. If user clicks to button, this attribute is set to Block. If you want to do things asynchronously think about AJAX calls using jQuery. Let me know if that helped a bit ;)","Q_Score":0,"Tags":"html,django,python-3.x,django-models","A_Id":56320030,"CreationDate":"2019-05-27T05:11:00.000","Title":"adding bed raw html form to room raw html as a pop up to add a lot of beds","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a BigQuery table 'A' with schema {'UUID': 'String'}. I want to join this table with a ADH(Ads Data Hub) table 'B' having schema {'UUID': 'String', 'USER_ID': 'INT'} on UUID and fetch all user_ids to a new table. \nI am having trouble in joining ADH table with BigQuery table.\nCan someone please help me out?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":774,"Q_Id":56339554,"Users Score":0,"Answer":"If your table A locates in the same region as your ADH account, you should be able to run cross table queries in ADH.\nYou cannot query user_id as part of the output by using ADH, it's not allowed due to privacy protection. However, if you had your UUID passed to Google Marketing Platform using floodlight with custom-variable enabled, you can use this UUID as join key to map both tables, and do analysis from there.","Q_Score":0,"Tags":"google-bigquery,google-ads-data-hub,ads-data-hub,python-bigquery","A_Id":68575038,"CreationDate":"2019-05-28T09:54:00.000","Title":"How to join BigQuery table with ADH(Ads Data Hub) table","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"In my app, the user can select a Youtube video that will be downloaded to MEDIA_ROOT folder and then also made available for the user to download.\nWhenever the user chooses another video to download, the previous one is deleted from MEDIA_ROOT. So at any given moment there is only one video sitting in the MEDIA_ROOT folder for a particular user.\nIs there any way - apart from implementing user authentication and associating the downloaded files with a user through foreign key, which I feel is an overkill for only this task - of telling the users apart whenever such download request is being made, so that one user's request does not cause the deletion of the file downloaded by some other user (as all the files sit in the same MEDIA_ROOT folder)?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":52,"Q_Id":56347774,"Users Score":1,"Answer":"Assuming you have some sort of web server, you can create custom links that redirect through your web server and pass IP information, etc, so you can distinguish a user before one downloads a video. That is certainly one way of doing it without authentication and since the app\/platform that tracks user data is in-house you don't have to worry about foreign keys, etc.","Q_Score":0,"Tags":"python,django","A_Id":56347972,"CreationDate":"2019-05-28T18:02:00.000","Title":"Are there any ways other than authentication to tell the users apart?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have two related problems. I'm working on Arabic dataset using Excel. I think that Excel somehow reads the contents as \u061f\u061f\u061f\u061f\u061f , because when I tried to replace this character '\u061f' with this '?' it replaces the whole text in the sheet. But when I replace or search for another letter it works.\nSecond, I'm trying to edit the sheet using python, but I'm unable to write Arabic letters (I'm using jGRASP). For example when I write the letter '\u0644' it appears as 0644, and when I run the code this message appears : \"\u064fError encoding text. Unable to encode text using charset windows-1252 \".","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":224,"Q_Id":56358762,"Users Score":0,"Answer":"0644 is the character code of the character in hex. jGRASP displays that when the font does not contain the character. You can use \"Settings\" > \"Font\" in jGRASP to choose a CSD font that contains the characters you need. Finding one that has those characters and also works well as a coding font might not be possible, so you may need to switch between two fonts.\njGRASP uses the system character encoding for loading and saving files by default. Windows-1252 is an 8-bit encoding used on English language Windows systems. You can use \"File\" > \"Save As\" to save the file with the same name but a different encoding (charset). Once you do that, jGRASP will remember it (per file) and you can load and save normally. Alternately, you can use \"Settings\" > \"CSD Windows Settings\" > \"Workspace\" and change the \"Default Charset\" setting to make the default something other than the system default.","Q_Score":0,"Tags":"excel,python-3.x,utf-8,character-encoding,arabic","A_Id":56370930,"CreationDate":"2019-05-29T10:47:00.000","Title":"How to enable my python code to read from Arabic content in Excel?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I already got some input into the flask from the forms using the fetch API POST method. Now depending on this input, I want to ask some more inputs (without rendering a new HTML page.) and process them again, so that I can finally return a string as the fetch response.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":129,"Q_Id":56359854,"Users Score":0,"Answer":"you should use JS on client side to handling user's first input to make next form\/fields for him","Q_Score":0,"Tags":"javascript,python,reactjs,flask","A_Id":56360429,"CreationDate":"2019-05-29T11:44:00.000","Title":"How to ask user input from flask (I'm using react for front end)?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an excel file where data is refreshing from third party application. \nProblem to solve: My DJANGO web application should monitor that excel file continuously and detect a change from that excel file. Whenever there is a change then particular location of web page should be refreshed.\nCould somebody please give suggestions to achieve this functionality?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":144,"Q_Id":56370814,"Users Score":0,"Answer":"Basically, you need to check with a runtime process (e.g a cron) if the previously version of your file is different to the new version calling your runtime process. This means that you could read the content of the CSV file (could be with import csv or using pandas \u00ecmport pandas as pd) and store it in some place (e.g another temporal file), then (according the time of you define to execute your cron) the content will be check again, and compare it against the content of what you previously have stored. If this happens, you could use Ajax to refresh your website section or use a real time library to refresh automatically, and store the new csv content again.","Q_Score":0,"Tags":"django,python-2.7","A_Id":56370919,"CreationDate":"2019-05-30T02:14:00.000","Title":"Monitor and Detect a change in Excel file and refresh location of the web page","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to get a list of all the items available for purchase on a certain web page. However, the web page only loads 12 items at a time until the user scrolls down and then 12 more are loaded. Is there a way, in C# or Python, using any open source libraries, to be able to \"see\" all of the items available without physically going to the page and scrolling down?\nUsing Chrome's developer tools, I can only \"see\" the 12 items in the HTML window until I physically scroll down on the web page and it loads more.\nNOTE: I'm relatively new at C#\/Python web scraping, so I appreciate any in depth answers!\nEDIT: If I were to use something like Selenium, would it be possible to load everything programatically? If so, how?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":628,"Q_Id":56380988,"Users Score":0,"Answer":"The Web browser itself can obviously load more items, and a web browser is just a program, so yes, it's possible to write a program to do it.\nBut you'd essentially be writing a mini web browser, which is a lot of work.\nDoes the website itself offer a way to load more items at once?  i.e. some websites offer a link or a dropdown menu in the corner of the page that allows you to increase the maximum number of items shown.","Q_Score":1,"Tags":"c#,python,html,web-scraping","A_Id":56381247,"CreationDate":"2019-05-30T15:14:00.000","Title":"How can I load all items on a web page when using an HTML parser?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"There is a table with a list of users and their email on a webpage. At the top of the page, is a search\/filter input field that allows the user to type an email or username and filter for the result as he\/she is typing. \nThe problem: However, when I use the send_keys() method instead of doing this manually, nothing is filtered in the table view.\nThis is happening on the Safari browser on the iPhone 7 Plus (real device, not simulator). Some other information:\n\niOS version: 12.2\nAppium version: 1.13.0-beta.3\nSelenium version: 2.53.1\nProgramming language: Python 2.7.15\n\nIn addition to send_keys(), i've tried to use set_value(), i've also tried to execute JS and setting the attribute value, and also tried to send key for each character (in a for loop with a delay between each character).\nI'm expecting for example, element.send_keys(\"test1000@test.com) to filter the table view on the web page so that the only user that is displayed has the associated test1000@test.com email as it does when I go through the site manually.\nIn actuality, send_keys() does not do that and nothing in the table view gets filtered.\nAny help or guidance would be appreciated!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":288,"Q_Id":56382223,"Users Score":0,"Answer":"Explicit wait for table to get populate in DOM\nsendKeys search String and additional key Tab\ntextbox.sendKeys(\"test1000@test.com\"+Keys.TAB)\nExplicit Wait for filter to get applied and table to get refreshed.\nfind elements for the newly populated table with applied filters.","Q_Score":0,"Tags":"selenium,appium,appium-ios,python-appium","A_Id":56395049,"CreationDate":"2019-05-30T16:37:00.000","Title":"Using send_keys() on a search\/filter input field does not filter results in table","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm new to web scraping and am trying to learn more. I know some websites load products on the back end before they make it available to the general public. Is there a way I can access that information using an HTML parser or any other library?\nI suspect the website developers use dynamic javascript to alter the information after loading. Or use different tags\/classes to hide the information?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":42,"Q_Id":56382627,"Users Score":0,"Answer":"I see two questions here: \n1)Can I access information on the webserver that isn't sent to the client page? \nNo. You can only scrape what exists on the page. Anything else would be illegally accessing a non-public server and goes beyond scraping into hacking.\n2) If the site loads asynchronously and\/or dynamically, can I access the content that loads after the main portion of the html?\nYes, using browser automation tools like selenium, you can approximate a user experiencing the site and wait for the full content to load before you scrape it. This is different from simple requests\/beautifulsoup, which only gathers the HTML at the point when you send the request.","Q_Score":0,"Tags":"python,web-scraping,beautifulsoup","A_Id":56382871,"CreationDate":"2019-05-30T17:05:00.000","Title":"If a website loads a product on the back end but does not publish it for the public yet, can I access that information?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is there any way to use the authenticated user or the server keytab in a python3\/flask-kerberos application to query ldap?\nI am using flask-kerberos connecting to active directory and is authenticating correctly.  I need to add authorization now based on the AD group and understand ldap is typically the best practice. \nI am able to query successfully via ldap3, but I do not want to hardcode ldap bind credentials in my code.\nThe sasl\/kerberos bind option for ldap3 looks like it needs an OS level credential-cache, but I would like to do this completely within the application.\nLooking for any suggestions\/alternatives to do this.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":665,"Q_Id":56384129,"Users Score":0,"Answer":"sounds like you are mixing up authentication and authorization, but with no useful information provided regarding your code or setup its hard to help.\nTake a look at something like this, and use ldap as impersonation to authenticate your users using their own credentials.","Q_Score":2,"Tags":"python,flask,ldap,kerberos","A_Id":56399552,"CreationDate":"2019-05-30T18:58:00.000","Title":"python ldap search with flask-kerberos credentials","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have java application. I want to find automation_id's for each control. I used print_control_identifiers() and dump_tree(). But, it took lot of time (more that 2 hours).Is there any possible way to get automation_id's within in small time? Also, with my application after clicking on button one window is opened. How can I find automation_id's for this window only?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":279,"Q_Id":56394179,"Users Score":1,"Answer":"use Inspect.exe to find automation id's of any control","Q_Score":0,"Tags":"python,pywinauto","A_Id":57095827,"CreationDate":"2019-05-31T11:23:00.000","Title":"How to find Automation_Id's using pywinauto?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am creating a simple Kivy app in python, but I can't figure out how to upload the .py as app to my iPhone for free.\nCan someone help me with this?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":152,"Q_Id":56400561,"Users Score":1,"Answer":"according to kivy documentation: \n\nIn order to submit any application to the iTunes store, you will need an iOS Developer License. For testing, you can use a physical device or the XCode iOS emulator.\n\nI suggest using a cheap android phone to test out your application. You will need to package your application for Android. In order to do this, you will need to use Linux.","Q_Score":1,"Tags":"python,ios,kivy","A_Id":56408450,"CreationDate":"2019-05-31T19:09:00.000","Title":"How to upload a python file with Kivy to iPhone for free?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to print receipt without decimal number in this receipt \nIn PosTicket of POS odoo 11, the receipt always have decimal number. I can change the digit at product price outside, but when go to the Print Receipt. It have decimal number. How can i remove them to print without this?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":298,"Q_Id":56412540,"Users Score":0,"Answer":"Are you trying to take decimal number out through out the entire system?\nor just the POS module? or particular form?  \nOdoo comes with built-in setting located at\nSettings>Technical>Database Structure>Decimal Accuracy \nFrom there, you can customize decimal points in the system, one of them is Product Price.","Q_Score":0,"Tags":"python-3.6,odoo-11","A_Id":56436636,"CreationDate":"2019-06-02T05:56:00.000","Title":"How can we remove decimal number llike \".00\" in PosTicket for \"print receipt\"?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"This is my first question so I appologize if it's not the best quality.\nI have a use case: User creates a monitoring task which sends an http request to a website every X hours. User can have thousands of these tasks and can add\/modify and delete them. When a user creates a task, django signals create a Celery periodic task which then is running periodically.\nI'm searching for a more scalable solution using AWS. I've read about using Lambda + Cloudwatch Events. \nMy question is: how do I approach this to let my users create tens of thousands of these tasks in the cheapest \/ most scalable way?\nThank you for reading my question!\nPeter","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":209,"Q_Id":56413651,"Users Score":0,"Answer":"There is no straight forward solution to your problem .You have to proceed step by step with some plumbing along the way .\nEvent management\n1- Create a lambda function that creates a cloudwatch schedule.\n2 - Create a lambda function that deletes a cloudwatch schedule.\n3 - Persist any event created using dynamodb\n4 - Create 2 API gateway  that will invoke the 2 lambda above.\n5 - Create anohter lambda function (used by cloudwatch) that will invoke the API gateway below.\n6 - Create API gateway that will invoke the website via http request.\nWhen the user creates an event from the app, there will be a chaining calls as follow :\n4 -> 1,3 -> 5-> 6\nNow there are two other parameters to take into consideration :\nLambda concurrency: you can't run simultaneously more than 1000 lambda in same region.\nCloudwatch: You can not create more than 100 rules per region . Rule is where you define the schedule.","Q_Score":1,"Tags":"python,django,amazon-web-services,aws-lambda,amazon-cloudwatch","A_Id":56414951,"CreationDate":"2019-06-02T09:05:00.000","Title":"What is a scalable way of creating cron jobs on Amazon Web Services?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I finished writing a Django application and now I want to deploy it,\nI have a Windows server and have successfully installed Python and Django on it,\nNow my app runs on localhost on my windows server,\nNow I want to make the site public, meaning that anyone who goes to the IP address of my windows server can browse my site,\nIs there a simple way to do this without using IIS?\nthank you","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":735,"Q_Id":56416878,"Users Score":0,"Answer":"I've never done what your planing but if you plan to host just one domain then localhost(127.0.0.1) will work just fine but if you plane to host multiple domain you will need to find a way to resolve the right domain to the right site.\nPorts to open on both router and Win Server\n80 for HTTP\n465 for HTTPS\nMake sure that you have a Static IP provided by your ISP, you will also need to make sure that your ISP does not Block port 80 if they do ask them to unblock.\nIf you don't have a static IP or ISP don't allow you to open port 80 then you can use DynDNS to forward traffic to your server, but this option is not the best.\nYour Server will also need a static IP to the server as mentiond by Legorooj","Q_Score":2,"Tags":"python,django,deployment,windows-server","A_Id":56417117,"CreationDate":"2019-06-02T16:30:00.000","Title":"deploying my django site to windows server without using IIS","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to redirect mysite.com\/index.php to  mysite.com\/clientarea.php using .htaccess does not work for me help out.\nwith simple code.\nI have tried several time and finally the site is not available  \n\nTry running Windows Network Diagnostics.\n  DNS_PROBE_FINISHED_NXDOMAIN","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":46,"Q_Id":56420275,"Users Score":0,"Answer":"Based on that error, it appears you're redirecting to a different hostname than mysite.com - I assume unintentionally.  \nIf you can post your .htaccess code, the solution may be easy to provide.","Q_Score":0,"Tags":"django,python-3.x,.htaccess,whmcs","A_Id":56420311,"CreationDate":"2019-06-03T01:49:00.000","Title":"How Can i redirect url to another url with the .htaccess in cpanel","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Appium is not finding element with MobileBy Accessibility ID and I'm calling the method from AppiumDriver class that inherits from the SeleniumDriver class. Any ideas? Thanks.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":151,"Q_Id":56421105,"Users Score":0,"Answer":"It ended up being, I had to use MobileBy.ID not MobileBy.Accessibility_ID and the element was found. The framework code was not an issue. Just using wrong locator type.","Q_Score":0,"Tags":"python,automation,appium","A_Id":56429709,"CreationDate":"2019-06-03T04:21:00.000","Title":"Appium is not finding element when using a method to find it from a python appium class that inherits from a selenium class","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I developed an ML model which requires two arguments, which are the path of the two files used by the model function. The task at hand requires a web page which could take those arguments for the model and deliver it to the function. \nThe job could also be done using Tkinter in python for developing a GUI Frame, but my situation requires a web page for further development.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":175,"Q_Id":56422270,"Users Score":1,"Answer":"You could use flask, pyramid, or django to make a web-app that will call your ML function.It doesent have to be hosted on a server you can run it locally on your computer.\nWhat isn't clear is why in your particular case you can't use Tkinter. Is your webpage suppose to be accesed by someone else ? From outside you local network ? \nThe question isn't verry clear.","Q_Score":0,"Tags":"python,html","A_Id":56422428,"CreationDate":"2019-06-03T06:44:00.000","Title":"How to run a python script from a HTML page without the use of a server? It should serve the purpose of a GUI Frame","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Here's what I want to accomplish: I have an 'age' field in my model which I'd like its value to be the time duration up til now - and I mean now as in real time, not just the obj creation time or updated time.\nAt first I was wondering if there's some kind of a dynamic field in django that the field value would just keep updating based on a formula. But then I figured that wasn't realistic, it has to be updated by something at some point in time.\nRight now what comes on my mind is to write a model method to calculate the value and assign it to the field, and to manually calls it and write the new value to the field everytime before the query of the class objects.\nI wonder is there any better way to accomplish this since my method will add some loading to the database which might just be unnecessary.\nThanks for your help.","AnswerCount":2,"Available Count":1,"Score":0.2913126125,"is_accepted":false,"ViewCount":63,"Q_Id":56422938,"Users Score":3,"Answer":"You never write things like this to a database, instead you store the date of birth \/ origin and then work out the age as when its needed.\nThe extra time involved in this calculation is so minimal that it will most likely never be the performance issue in your code.","Q_Score":1,"Tags":"python,django","A_Id":56423006,"CreationDate":"2019-06-03T07:36:00.000","Title":"What's the best practice to update a field automatically?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I\u2019m trying to run some robot framework tests in eclipse. I have Python, PyDev, Robot Framework (and all other things which I need) already installed, but it comes always the same error message \"Parsing failed: Unsupported file format 'py'\". Does anyone know where the problem may lie? Thank you in advance!","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":1138,"Q_Id":56426637,"Users Score":2,"Answer":"You will get this exact error if you tell robot to run a file as if it was a test case (e.g. robot something.py). The solution is pretty simple: don't pass a .py file as an argument to robot.","Q_Score":0,"Tags":"python,eclipse,robotframework,pydev","A_Id":56428824,"CreationDate":"2019-06-03T11:44:00.000","Title":"Parsing failed: Unsupported file format 'py'","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to install Django 2.2.2 on my MacBook pro (latest generation), and I am a user of python 3x.  However, my default version of python is python 2x and I cannot pip install Django version 2x when I am using python 2x.  Could anyone explain how to change the default version of python on MacBook I have looked at many other questions on this site and none have worked.  All help is appreciated thank you :)","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":39,"Q_Id":56448721,"Users Score":0,"Answer":"You can simply use pip3 instead of pip to install Python 3 packages.","Q_Score":0,"Tags":"python,django,bash,macos,pip","A_Id":56448819,"CreationDate":"2019-06-04T17:28:00.000","Title":"How do you install Django 2x on pip when python 2x is your default version of python but you use python 3x on Bash","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Wagtail includes a \"settings\" menu item by default, with some default settings items, such as \"sites\" and \"redirects\".\nI know that you can register a new setting with the register_setting decorator, and that various hooks are available for customizing the top level menu items, but not sub-menu items. How can I REMOVE (or hide the display of) the default settings items?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":644,"Q_Id":56452060,"Users Score":2,"Answer":"Create a Wagtail group (Groups under the Settings menu).  When assigning object permissions for the group, make sure Site Settings is not selected.  Then assign to the group the Users who you do not want to be able to see the Site Settings menu, and it will not show up for them.","Q_Score":1,"Tags":"python,django,wagtail","A_Id":56453098,"CreationDate":"2019-06-04T22:22:00.000","Title":"Wagtail - How To Remove Sub-Menu Items From Settings Menu","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to create a form in Django using Django form. \nI need two types of forms.\n\nA form that collect data from user, do some calculations and show the results to user without saving the data to database. I want to show the result to user once he\/she press button (calculate) next to it not in different page. \nA form that collect data from user, look for it in a column in google sheet, and if it's unique, add it to the column otherwise inform the user a warning that the data is not unique.\n\nThanks","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":299,"Q_Id":56473174,"Users Score":0,"Answer":"You could use AJAX and javascript to achieve this, but I suggest doing this only via javascript. This means you will have to rewrite the math in JS and output it directly in the element.\nPlease let me know if you need any help :)\nJasper","Q_Score":0,"Tags":"html,django,python-3.x,django-forms","A_Id":56474809,"CreationDate":"2019-06-06T07:55:00.000","Title":"How to use data obtained from a form in Django form?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to create a form in Django using Django form. \nI need two types of forms.\n\nA form that collect data from user, do some calculations and show the results to user without saving the data to database. I want to show the result to user once he\/she press button (calculate) next to it not in different page. \nA form that collect data from user, look for it in a column in google sheet, and if it's unique, add it to the column otherwise inform the user a warning that the data is not unique.\n\nThanks","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":299,"Q_Id":56473174,"Users Score":0,"Answer":"Start by writing it in a way that the user submits the form (like any normal django form), you process it in your view, do the calculation, and return the same page with the calculated values (render the template). That way you know everything is working as expected, using just Django\/python.\nThen once that works, refactor to make your form submit the data using AJAX and your view to just return the calculation results in JSON. Your AJAX success handler can then insert the results in the current page.\nThe reason I suggest you do this in 2 steps is that you're a beginner with javascript, so if you directly try to build this with AJAX, and you're not getting the results you expect, it's difficult to understand where things go wrong.","Q_Score":0,"Tags":"html,django,python-3.x,django-forms","A_Id":56479353,"CreationDate":"2019-06-06T07:55:00.000","Title":"How to use data obtained from a form in Django form?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How can I synchronise the front-end and back-end to get the data in the real-time than periodically making a request to the back-end API?\nI have been using an angular 7.2 framework at the front-end and python as a back-end. I want a technique so that the changes in the back-end and the database can be listened by the front-end and the browser becomes up to date.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":163,"Q_Id":56473272,"Users Score":0,"Answer":"Use web sockets :  real time communication between web servers and clients is possible with the help of this protocol.","Q_Score":0,"Tags":"python,angular","A_Id":56474506,"CreationDate":"2019-06-06T08:02:00.000","Title":"How to fetch the data using angular 7 from the server (python) in the real-time to keep UI updated?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I use the requests Module with python At the moment. I use \"r.status_code == 200\" to check if the response is valid. But for my project right now it gaves me false posetives. It would be better for me  to check if a response is valid with a Keyword check on the sourcecode or something like this is this possible ?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1387,"Q_Id":56517575,"Users Score":0,"Answer":"If I understand your question correctly, its possible for your request to give you back empty or invalid data that is not useful to you. \nWithout knowing what this request return you could look for specific fields in the request, for example if the request returns a json look for specific fields using if json_file.get(\"field_name\", False)","Q_Score":0,"Tags":"python,request","A_Id":56517613,"CreationDate":"2019-06-09T19:03:00.000","Title":"Python requests check if success","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm running Django 2.2, python 3.6.7 and I'm working in a virtual environment on Ubuntu 18.04.\nHaving done a tutorial where the project \"mysite\" was built, I'm now doing another exercise to build an API. I'm using the same virtualenv. However when I migrate in my new project, call it tutorial, I get ModuleNotFoundError: No module named 'mysite'. \nSo I deleted mysite. And I get the same error. And then I deleted the parent directory, recreated it (obviously not including mysite) and get the same error. I've searched recursively the codebase and the virtualenv and \"mysite\" does not turn up.\nWhat's going on here?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":251,"Q_Id":56523809,"Users Score":1,"Answer":"You need to set DJANGO_SETTINGS_MODULE\/PYTHON_PATH environment variables.","Q_Score":3,"Tags":"python,django","A_Id":56524061,"CreationDate":"2019-06-10T09:35:00.000","Title":"Django module not found error, but it's been deleted and all references removed","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created my tensorflow model which will act as a serve. Code will be hosted on client's local server. I don't want to give them my code but give them a wheel file. But after following python's package distribution my tensorflow files become corrupted.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":120,"Q_Id":56526497,"Users Score":0,"Answer":"You can send only the frozen inference graph in .pb format.","Q_Score":0,"Tags":"python,tensorflow,keras,setup.py,python-wheel","A_Id":56526556,"CreationDate":"2019-06-10T12:31:00.000","Title":"Packaging tensorflow models as wheel files","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In Scrapy Cloud, a job can be deleted. At first, its state will change, but the data will be available - items data, job.metadata, items.stats.\nWhat's the process of deletion in particular? How soon all of data will be erased?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":92,"Q_Id":56529737,"Users Score":2,"Answer":"Job deletion in Scrapy Cloud is an asynchronous process: at first, the jobs are just marked as deleted with all its data available, and then it's purged on the server side after 7 days (using a cron job). It's implemented in this way to have the last chance to recover jobs deleted by mistake or save some important data.\nAlso, purging in the context relates only to job data (requests\/items\/logs\/samples), while job metadata and stats are stored indefinitely for now (though you shouldn't rely on that, the policy can be revised at any given moment).","Q_Score":1,"Tags":"python,scrapy","A_Id":56539708,"CreationDate":"2019-06-10T15:58:00.000","Title":"What happens after scrapy job is deleted before it is erased","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was adding a Python plugin to Eclipse. I was able to successfully add PyDev. However, when I was adding manually the interpreter I got the following error:\n-Using an unsupported version\n(Python and JPython require at least version 2.1 and IronPython 2.6).\n-Specifying an invalid interpreter\n(usually a link to the actual interpreter on Mac or Linux)\nThe Python exe file I am using is python-3.5.1-amd64.exe. How can I fix this error?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":151,"Q_Id":56536856,"Users Score":0,"Answer":"Try using Jython 2.7.0 instead of Jython 2.7.1. I had","Q_Score":0,"Tags":"python-3.x,eclipse,eclipse-plugin","A_Id":71904828,"CreationDate":"2019-06-11T05:09:00.000","Title":"Error Setting Python Plugin on Eclipse: Using an Unsupported version (Python and JPython)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to display a markdown(readme) file into an odoo view as a field, i'm using the parser mistune to parse the file into an html format; as a result, the text is displayed as expected, except for every images located in src\/img folder for the odoo module structure.\n(example of image: ![Capture](static\/src\/img\/usecase.png))\nI've tried with the html inspector and it says the image wasn't found, and when I hover it, the path is http:\/\/server-s551lb:8069\/static\/src\/img\/usecase.png and I find it weird because it's only the relative path to locate the image.\nAny help or idea would be welcome:)","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":387,"Q_Id":56540338,"Users Score":0,"Answer":"I've found by adding modulename\/ before static from the relative path of the image :)","Q_Score":1,"Tags":"python,odoo","A_Id":56541489,"CreationDate":"2019-06-11T09:16:00.000","Title":"Odoo doesn't displays markdown images","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have downloaded postgresql as well as django and python but when I try running the command  \"python manage.py runserver\"   it gives me an error saying \"Fatal: password authentication failed for user\" .   I am trying to run it locally but am unable to figure out how to get past this issue.    \nI was able to connect to the server in pgAdmin but am still getting password authentication error message","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":227,"Q_Id":56548140,"Users Score":0,"Answer":"You need to change the password used to connect to your local Database, and this can be done, modifying your setting.py file in \"DATABASES\" object","Q_Score":0,"Tags":"python,django,postgresql","A_Id":63626428,"CreationDate":"2019-06-11T16:32:00.000","Title":"Password authentication failed when trying to run django application on server","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've created a Mac app and I'd like to share it to my iPhone and run it there, but when I share it via mail or airdrop, I can't open it.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":208,"Q_Id":56548553,"Users Score":0,"Answer":"You simply can't run a MacOS application on IOS. Instead, remake it with for example Xcode so the application can run on your iPhone.","Q_Score":0,"Tags":"python,python-3.x,py2app","A_Id":65158275,"CreationDate":"2019-06-11T17:00:00.000","Title":"how to share an ' .app ' (created with py2app) from Mac to iPhone?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am looking for ways to best handle a single form on multiple pages. Like how a newsletter signup might be on a home page, an about page, and several blog pages. \nI've handled this exact scenario in these 2 ways. \n\nWrite an API (using DRF) that takes a POST request, and then point the normal HTML form at that API. This works, and is very flexible, but feels like overkill.\nPass the form object into the context of each view I want the form to be on, and then include that into the template with includes form_snippet with form=form\n\nThe first approach is more flexible with wagtail, wherein all that needs to happen on the admin side is an inclusion of the newsletter as a snippet, where the admin user is able to choose if they want the newsletter on the page or not. \nWhile both approaches work just fine, neither of them \"feels\" right, as I would think there is a simple way to do this without creating a big API, or passing around the form object to every single view.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":291,"Q_Id":56551998,"Users Score":0,"Answer":"I did this with a contact formular. I handled it with a new app for my contact formular.\nIn this contactApp is the templates\/contactForm.html. To include this contactForm where I want I use {% include 'contact\/contactForm.html' %} so it loads the contactForm.html from my app called contact.","Q_Score":0,"Tags":"python,django,forms,wagtail","A_Id":56587802,"CreationDate":"2019-06-11T21:38:00.000","Title":"How to have single form on multiple pages","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"From what I understand,there are two different starting points where we can \nrun server through python manage.py runserver command in Django: \nFirst > \"mysite\" (as in many tutorials, and this folder is called \"project\" right?\nSecond > \"app\"(as in many django blog tutorials \"blog\")\nBut as I entered the command \"cd mysite\"(notice it's not \"cd app\")\n and did git push to pythonanywhere, \nmy pythonanywhere just shows \"mysite\" which I didn't even type in \"python manage.py migrate\"! \nSo I realized because of that, I couldn't even enter the admin website since I didn't create user on this \"project\" level but only in my \"app\" level \nIs there anything I missed or did wrong with this?\nIs it normal for a user to set up admin password on \"app\" level right?\nWhat did I do wrong on this and how can I fix it so that pythonanywhere shows my \"app\"?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":348,"Q_Id":56557374,"Users Score":2,"Answer":"It sounds like you have put your entire project at the \"app\" level of the Django project that was created by PythonAnywhere already. The top-level manage.py is the one that PythonAnywhere created for you and the one further down is the one that came from your git repo. There is help documentation on how to deploy an existing Django site on the PythonAnywhere help pages that would be a good place to start.","Q_Score":0,"Tags":"python,django,pythonanywhere","A_Id":56562057,"CreationDate":"2019-06-12T08:04:00.000","Title":"why are there two manage.py in django project?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"The ACS url in the Google SSO SAML setup where Google is the Identity Provider has to start with https. Therefore, I've not been able to use a localhost url. Is there a way how I could test Google SSO SAML on a local server? What url (or other details) do I need to enter?","AnswerCount":5,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":5382,"Q_Id":56581853,"Users Score":0,"Answer":"I had same problem , i ran my app on localhost with https using local iis with self signed certificate and it worked just fine.\nThis way its easy to debug saml response from google rather than using remote urls.","Q_Score":5,"Tags":"python,google-cloud-platform,single-sign-on,saml-2.0,google-sso","A_Id":59552333,"CreationDate":"2019-06-13T13:40:00.000","Title":"Test Google SSO SAML on Localhost","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I tried doing it by creating a css file style.css in the same folder, copied the source code of the bulma link provided and then linked it to my html doc. But then, it shows no css features at all.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1985,"Q_Id":56595054,"Users Score":0,"Answer":"Although I didn't achieve what I was trying to do, I guess the only solution is either copying the exact design provided via Bulma link or ending up writing the whole css code all by own which I don't really prefer until essentially needed. So, I'd rather stick to the pre-defined design provided by Bulma.","Q_Score":1,"Tags":"html,css,django,python-3.x,bulma","A_Id":56610545,"CreationDate":"2019-06-14T09:15:00.000","Title":"Is there any way in which I can edit \"https:\/\/cdnjs.cloudflare.com\/ajax\/libs\/bulma\/0.7.5\/css\/bulma.css\" file?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"thanks for hearing me out.\nI have a dataset that is a matrix of shape 75000x10000 filled with float values. Think of it like heatmap\/correlation matrix. I want to store this in a SQLite database (SQLite because I am modifying an existing Django project). The source data file is 8 GB in size and I am trying to use python to carry out my task.\nI have tried to use pandas chunking to read the file into python and transform it into unstacked pairwise indexed data and write it out onto a json file. But this method is eating up my computational cost. For a chunk of size 100x10000 it generates a 200 MB json file.\nThis json file will be used as a fixture to form the SQLite database in Django backend.\nIs there a better way to do this? Faster\/Smarter way. I don't think a 90 GB odd json file written out taking a full day is the way to go. Not even sure if Django databases can take this load.\nAny help is appreciated!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":124,"Q_Id":56633576,"Users Score":2,"Answer":"SQLite is quite impressive for what it is, but it's probably not going to give you the performance you are looking for at that scale, so even though your existing project is Django on SQLite I would recommend simply writing a Python wrapper for a different data backend and just using that from within Django.\nMore importantly, forget about using Django models for something like this; they are an abstraction layer built for convenience (mapping database records to Python objects), not for performance. Django would very quickly choke trying to build 100s of millions of objects since it doesn't understand what you're trying to achieve.\nInstead, you'll want to use a database type \/ engine that's suited to the type of queries you want to make; if a typical query consists of a hundred point queries to get the data in particular 'cells', a key-value store might be ideal; if you're typically pulling ranges of values in individual 'rows' or 'columns' then that's something to optimize for; if your queries typically involve taking sub-matrices and performing predictable operations on them then you might improve the performance significantly by precalculating certain cumulative values; and if you want to use the full dataset to train machine learning models, you're probably better off not using a database for your primary storage at all (since databases by nature sacrifice fast-retrieval-of-full-raw-data for fast-calculations-on-interesting-subsets), especially if your ML models can be parallelised using something like Spark.\nNo DB will handle everything well, so it would be useful if you could elaborate on the workload you'll be running on top of that data -- the kind of questions you want to ask of it?","Q_Score":0,"Tags":"python,sql,django,pandas,bigdata","A_Id":56656088,"CreationDate":"2019-06-17T14:39:00.000","Title":"I want to write a 75000x10000 matrix with float values effectively into a database","Data Science and Machine Learning":1,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am having a model Employee with a OneToOneField relationship with Django USER model. Now for some reason, I want to change it to the ManyToOne(ForeignKey) relationship with the User model.\nBoth these tables have data filled. Without losing the data how can I change it?\nCan I simply change the relationship and migrate?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":151,"Q_Id":56648907,"Users Score":0,"Answer":"makemigrations in this case would only correspond to an sql of Alter field you can see the result of makemigrations, the same sql will be executed when you migrate the model so the data would not be affected","Q_Score":1,"Tags":"python,django","A_Id":56649220,"CreationDate":"2019-06-18T12:13:00.000","Title":"How to change a OneToOneField into ForeignKey in django model with data in both table?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have Created a model in odoo 11, I want to load different tree views based on a filter, these tree views will be showing different columns and column headers","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":78,"Q_Id":56649905,"Users Score":1,"Answer":"If you want to show tree view according to user you can do that by applying group on views or if you want to show different view according to different value you can set thier view id.","Q_Score":0,"Tags":"python-3.x,odoo-11","A_Id":56700199,"CreationDate":"2019-06-18T13:07:00.000","Title":"Odoo 11 Switch between tree views for the same model based on conditions","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have Created a model in odoo 11, I want to load different tree views based on a filter, these tree views will be showing different columns and column headers","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":78,"Q_Id":56649905,"Users Score":0,"Answer":"Or I could create groups and actions and the different views to load for each user in a specific group using domains in the action.\nI think that could also actually work in this case.","Q_Score":0,"Tags":"python-3.x,odoo-11","A_Id":58852043,"CreationDate":"2019-06-18T13:07:00.000","Title":"Odoo 11 Switch between tree views for the same model based on conditions","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In my view I generate 5 images (they are generated by pyplot.)\nEverything seems to work fine.  The files are generated correctly in the right directory.\nBut the browser only shows one of the five images, and the requests for the other 4 usually timeout.  Looking at the django server output, the GET requests will often take five minutes to finish.\nThese images are ~100kb, and are present and correct on the drive immediately after being generated.\nAm I missing a call for Django to update the new static files?  Something else?  Please help!","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":328,"Q_Id":56665096,"Users Score":1,"Answer":"Deal with them as a media file, save the files to your media server (CDN or local), then send the URL of the images to the browser to load them.","Q_Score":0,"Tags":"python,django","A_Id":56666198,"CreationDate":"2019-06-19T10:04:00.000","Title":"Django taking very long time to serve generated static files","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In my view I generate 5 images (they are generated by pyplot.)\nEverything seems to work fine.  The files are generated correctly in the right directory.\nBut the browser only shows one of the five images, and the requests for the other 4 usually timeout.  Looking at the django server output, the GET requests will often take five minutes to finish.\nThese images are ~100kb, and are present and correct on the drive immediately after being generated.\nAm I missing a call for Django to update the new static files?  Something else?  Please help!","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":328,"Q_Id":56665096,"Users Score":0,"Answer":"I also faced a similar problem but with audio files. To resolve that issue I used pagination and that solved my issue. I think you should try that, like view one image in one page and second image on second page.","Q_Score":0,"Tags":"python,django","A_Id":56665245,"CreationDate":"2019-06-19T10:04:00.000","Title":"Django taking very long time to serve generated static files","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Let's say I have 2 robot framework script (x.robot ans y.robot),\nis there a way that x.robot script will execute y.robot with different parameters?\nMeaning I don't want duplicate *.robot scripts but one script that run with different parameters each time.\nI'm using Python3","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":432,"Q_Id":56686810,"Users Score":1,"Answer":"is there a way that x.robot script will execute y.robot with different parameters?\n\nNo, there is not. Robot has no ability to run a test suite from another test suite. Your only option is to spawn a new process, which means the result of this second test suite will be written to a different log file.","Q_Score":1,"Tags":"python-3.x,robotframework","A_Id":56689706,"CreationDate":"2019-06-20T13:15:00.000","Title":"Robot Framework - Call *.robot script from other *.robot script with parameters","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"how to display contact without company in odoo 11 , exemple : if mister X in Company Y, in odoo, display this mister and company : Y, X. But i want only X. thanks","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":1041,"Q_Id":56707951,"Users Score":2,"Answer":"That name comes via name_get method written inside res.partner.py You need to extend that method in your custom module and remove company name as a prefix from the contact name.","Q_Score":1,"Tags":"python,xml,odoo","A_Id":56713226,"CreationDate":"2019-06-21T17:20:00.000","Title":"How to display contact without company in odoo?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I automated the Test Suite using Robot Framework-Selenium base on PYTHON 27. This same Test Suite needs to execute on client side. \nBut Company do not want to share code base with client. \nIs there anyway that  I can create binary file of Robot Framework and share the same binary file with client instead of sharing a actually code ?\nlike in Java we create .jar file.\nKindly help me I am looking for solution from last three days.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":343,"Q_Id":56709077,"Users Score":0,"Answer":"I don't think there's anything you can do. Robot doesn't have the ability to parse binary files, so any solution would have to include converting your binary files to text files on the client machine.","Q_Score":1,"Tags":"python,robotframework,executable,robotium","A_Id":56709784,"CreationDate":"2019-06-21T19:00:00.000","Title":"How to hide robot framework code base and share only binary file to client?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am running some crawls in order to test if the results I get deviate. For this effort I created two test suites, the first one I created with the requests and BeautifulSoup library, the other one is based on selenium. I would like to find out, if pages detect both bots in the same way. \nBut I am still unsure if I am right, by assuming that requests and BeautifulSoup are independent from Selenium. \nI hope its not a dump question, but I haven't find any proper answer yet (maybe because of the wrong keywords). However, any help would be appreciated. \nThanks in advance\nI checked the requests documentation. I wrote a mail to the developer, without any answer. And of course I checked on google. I found something about scrapy vs selenium but well... are requests and BeautyfulSoup related to scrapy?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2861,"Q_Id":56728377,"Users Score":1,"Answer":"The python requests module does not use Selenium, neither does BeautifulSoup. Both will run independent of a web browser. Both are pure python implementations.","Q_Score":1,"Tags":"python,selenium,python-requests","A_Id":56728393,"CreationDate":"2019-06-23T23:19:00.000","Title":"Does requests rely on selenium?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I wrote a web scraper in Python, which works very well on my Laptop at home. After deploying it to AWS EC2 the performance of the scraper deteriorates. Now I am confused about the performance of EC2 instances (even of the micro and small instances, see further details below).\nScraper in python:\nGenerally, inner loop of the scrapes does the following:\n(1) the scraper looks up urls on a site (20 per site, one site = one \"site_break\"). In a second step it (2) gets the soruce code of each url, in a third step it (3) extracts the necessary information into an dataframe and in the fourth step it (4) saves the dataframe as pkl.\nAfter all loops it opens and merges the dataframs and saves it as csv.\nThe crucial (most time consuming parts) are:\n(2) download of source codes (I\/O limited by download speed): the program fills the RAM with the source code\n(3) processing of the sources codes (CPU 100%)\nTo use the RAM fully and stick together similar processes, every loop consists of site_break = 100, i.e. 100 sites * 20 urls\/site = 2000 urls. This fills the RAM of my PC to 96% (see below). Since I have to wait for server responses in step 1 and step 2, I implemented threading with maxWorkers=15 (alternatively 20-35 with similar results). This implementation cuts the run time by 80%. I am sure I could get some other .% by implementing asyncio. Nevertheless, I want to start with the lean MVP. In the processor consuming step 3 I didn't implement multiprocessing (yet), because my goal was an cost efficient\/free implemenation on t2.micro (with just one processor).\nSpecification:\nHome PC: Intel Core i7-6500 CPU, 2.59 Ghz (2 Cores, 4 logical Processors), RAM 8.00 GiB, 64-bit, x64, 50Mbit\/s Download-rate (effectively up to 45 Mbit\/s), Python 3.7.3, conda env\nEC2 t2.micro: vCPUs = 1, RAM 1.0 GiB, Network Performance \"low to moderate\" (research in forums tell my this could be something above 50 Mbit), Ubuntu 18.04, Python 3.7.3, conda env\nEC2 t3a.small: vCPUs = 2, RAM 2.0 GiB, Network Performance \"low to moderate\" but another AWS site tells me: \"up to 5 Gbit\/s\", Ubuntu 18.04, Python 3.7.3, conda env\nSince the RAM of the t2.micro is just 1 GiB, I lowered the site_break from 100 to 25. Afterwards, the RAM still got full, so I decreased it in further steps from 25 to 15, 12, 10 and finally 5. For 12, 10 and especially for 5 it works pretty well:\nI needed 5:30min for on loop with site_break = 100 on my PC. t2.micro need 8-10sec for site_break = 5, which leads to 3:00min for analogous 100 sites, which satisfied me in the first moment.\nUnfortunately, the following issue appears: After 20-30 loops the performance plumments. The time for on loop increases rapidly from 8sec to over 2min. My first assumption was it to be the low RAM, during the small loops it doesn't seem run full. After stopping and cleaning the RAM, the performance drops after the second or third loop. If I start it a few hours later the first case (with drop after 20-30 loops) repeats.\nBecause I firstly thought it has to do with the RAM, i launched a second instance on t3a.small with more CPU, RAM and \"up to 5 Gbit\/a\" network performance. I sliced to looks to site_break = 25 and startet the script. I is still running with a constant speed of 1:39-1:55min per loop (which is half as fast as t2.micro in its best phase (10 sec for 5 => 50 sec for 25).\nParallely, I started the script from my home PC with site_break = 25 and it is constantly faster with 1:15-1:30min per loop. (Stopping the time manuall results in 10-15sec slower for downloading and 10-15 sec slower for processing).\nThis all confuses me.\nNow my questions:\n\nWhy does the t2.micro detetoriate after several loops and why does the performance vary so wildly?\nWhy is the t3a.small 50% slower than the t2.micro? I would assume that the \"bigger\" machine would be faster in any regard.\n\nThis lets me stuck:\n\nDon't want to use my home PC for regularly (daily scraping), since the connection aborts at 4am for a tiny period of time and leads to hanging up of the script). Moreover, I don't want the script run manually and the PC all the time and block my private internet stream.\n\nt2.micro: Is useless, because the performance after the deterioration is not acceptable.\n\nt3a.small: performance is 10-20% lower than private PC. I would expect it to be better somehow? This lets my doubt to scrape over an EC2. Moreover, I can't understand the lower performance in comparison to t2.micro at the beginning.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":830,"Q_Id":56734108,"Users Score":1,"Answer":"Why does the t2.micro detetoriate after several loops and why does the performance vary so wildly?\n\nIf your RAM is not getting full, then this is most likely because Amazon is limiting the resources your instance is consuming whether that is CPU or I\/O. Amazon will give you more compute and throughput for a while (to accommodate any short-term spikes) but you should not mistake that for baseline performance.\n\nWhy is the t3a.small 50% slower than the t2.micro? I would assume that the \"bigger\" machine would be faster in any regard.\n\nT3 instances are designed for applications with moderate CPU usage that experience temporary spikes in use. With t3 you are either paying a premium to be able to afford larger and more frequent spikes, or, you are getting less baseline performance (for the same price) to be able to afford larger and more frequent spikes. This does not match the web-scraping profile where you want constant CPU and I\/O.","Q_Score":1,"Tags":"python,performance,amazon-web-services,amazon-ec2,web-scraping","A_Id":64767158,"CreationDate":"2019-06-24T09:57:00.000","Title":"Web Scraping Performance issues EC2 vs Home PC","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I get this error:\n\nCould not install packages due to an EnvironmentError: Could not find a suitable TLS CA certificate bundle, invalid path: \/home\/yosra\/Desktop\/CERT.RSA\n\nWhen I run: $ virtualenv venv\nSo I put a random CERT.RSA on the Desktop which worked and I created my virtual environment, but then when I run: pip install -r requirements.txt\nI got this one:\n\nCould not install packages due to an EnvironmentError: HTTPSConnectionPool(host='github.com', port=443): Max retries exceeded with url: \/KristianOellegaard\/django-hvad\/archive\/2.0.0-beta.tar.gz (Caused by SSLError(SSLError(0, 'unknown error (_ssl.c:3715)'),))\n\nI feel that these 2 errors are linked to each other, but I want to know how can I fix the first one?","AnswerCount":5,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":28651,"Q_Id":56738345,"Users Score":0,"Answer":"We get this all the time for various 'git' actions.  We have our own CA + intermediary and we don't customize our software installations enough to accomodate that fact.\nOur general fix is update your ca-bundle.crt with the CA cert pems via either concatenation or replacement.\ne.g. cat my_cert_chain.pem >> $(python -c \"import certifi; print(certifi.where())\")\nThis works great if you have an \/etc\/pki\/tls\/certs directory, but with python the python -c \"import certifi; print(certifi.where())\" tells you the location of python's ca-bundle.crt file.\nAlthought it's not a purist python answer, since we're not adding a new file \/ path, it solves alot of other certificate problems with other software when you understand the underlying issue.\nI recommended concatenating in this case as I don't know what else the file is used for vis-a-vis pypi.","Q_Score":14,"Tags":"python,ssl,pip","A_Id":71769428,"CreationDate":"2019-06-24T14:06:00.000","Title":"Could not install packages due to an EnvironmentError: Could not find a suitable TLS CA certificate bundle, invalid path","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I get this error:\n\nCould not install packages due to an EnvironmentError: Could not find a suitable TLS CA certificate bundle, invalid path: \/home\/yosra\/Desktop\/CERT.RSA\n\nWhen I run: $ virtualenv venv\nSo I put a random CERT.RSA on the Desktop which worked and I created my virtual environment, but then when I run: pip install -r requirements.txt\nI got this one:\n\nCould not install packages due to an EnvironmentError: HTTPSConnectionPool(host='github.com', port=443): Max retries exceeded with url: \/KristianOellegaard\/django-hvad\/archive\/2.0.0-beta.tar.gz (Caused by SSLError(SSLError(0, 'unknown error (_ssl.c:3715)'),))\n\nI feel that these 2 errors are linked to each other, but I want to know how can I fix the first one?","AnswerCount":5,"Available Count":2,"Score":0.0399786803,"is_accepted":false,"ViewCount":28651,"Q_Id":56738345,"Users Score":1,"Answer":"I received this error while running the command as \"pip install flask\" in Pycharm.\nIf you look at the error, you will see that the error points out to \"packages due to an EnvironmentError: Could not find a suitable TLS CA certificate bundle -- Invalid path\".\nI solved this by removing the environment variable \"REQUESTS_CA_BUNDLE\" OR you can just change the name of the environment variable \"REQUESTS_CA_BUNDLE\" to some other name.\nRestart your Pycharm and this should be solved.\nThank you !","Q_Score":14,"Tags":"python,ssl,pip","A_Id":65888336,"CreationDate":"2019-06-24T14:06:00.000","Title":"Could not install packages due to an EnvironmentError: Could not find a suitable TLS CA certificate bundle, invalid path","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"My virtual environment refuses to recognize my install of Django (strangely)\nI'm on Windows Server, installed Python 3.7 to a directory (C:\\Python37) which I have C:\\Python37;C:\\Python37\\Scripts in my windows Path so when using Powershell or GitBash I can use the python command.\nif I run where python it shows the default install\nI CD into my django project directory and run:\npython virtualenv venv and the venv directory is created\nThen I run source venv\/Scripts\/activate and it activates appropriately.\nWhen I run where python it shows the exe inside the venv directory - which is expected and appropriate.\nI run pip install -r requirements.txt and all my requirements install appropriately. I confirm they are installed with pip freeze (all installed correctly)\nOnce I do that I go to run python manage.py collectstatic (no migrations are required in this particular instance) I get an error message that Django isn't installed.\nTo check this, with my virtualenv still activated I enter the shell (python)\nIf I do import django it also says Django is not installed.\nI cannot figure out what's happening here - the python version appears to be correct, the correct virtualenv is activated - but it's still not seeing the properly installed Django installation.\nThoughts? Ideas?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1061,"Q_Id":56741516,"Users Score":2,"Answer":"For what it's worth - here is the solution and explanation:\nEverything works as expected as was outlined in the question - the reason that the actual python command wasn't working had to do with a line in the .bashrc file.\nThere was an alias in the .bashrc file to set python to the command winpty C:\\Python37\\python\nSo when the command python manage.py collectstatic was getting ran - it was looking at the Python executable in the Python37 directory and not the virtualenvironment Python.\nThis was solved by simply running the appropriate Python (e.g.)\nC:\/my_project\/venv\/Scripts\/python manage.py collectstatic\nThis forced it to use the virtualenvironment python to run the command so everything worked as expected.","Q_Score":4,"Tags":"python,django,virtualenv,windows-server-2012-r2,python-venv","A_Id":56753709,"CreationDate":"2019-06-24T17:41:00.000","Title":"Python (Windows Server) Virtualenv not recognizing Django is installed","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on a web scraping project using python and an API\nI want the python script to be ran everyday for 5 days for 12 hours as a job\nI don't want to keep my system alive to either do it in CMD or in Jupyter so I was looking for a solution wherein any cloud service would help me automate the process","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":58,"Q_Id":56762429,"Users Score":0,"Answer":"One way to do this would be to write a web scraper in Python, and run it on an AWS Lambda, which is essentially a serverless function with no underlying ops to manage. Depending on your use case, you could either perform some action based on the contents of that page data, or you could write the result out to S3 as a file.\nTo have your function execute in a recurring fashion, you can then set your AWS Lambda event trigger to be a CloudWatch event (in this case, some recurring timer at whatever frequencies\/times you'd like, such as once each hour for a 12 hour window during Mon-Fri). \nThis is typically going to be an easier approach when compared to spinning up a virtual server (EC2 instance), and managing a persistent process that could error during waits\/operation for any number of reasons.","Q_Score":0,"Tags":"python,amazon-web-services,google-cloud-platform,automation","A_Id":56762555,"CreationDate":"2019-06-25T21:44:00.000","Title":"How do I run a python code on a cloud service to automate it's run for 5 days","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a flask application installed on cpanel and it's giving me some error while the application is running. Application makes an ajax request from the server, but server returns the response with a 500 error. I have no idea how I get the information that occurs to throw this error.\nThere's no information on the cpanel error log and is it possible to create some log file that logs errors when occur in the same application folder or something?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":424,"Q_Id":56764314,"Users Score":1,"Answer":"When you log into cPanel go to the Errors menu and it will give a more detailed response to your errors there. You can also try and check: \/var\/log\/apache\/error.log or \/var\/log\/daemon.log","Q_Score":0,"Tags":"python,flask","A_Id":56767500,"CreationDate":"2019-06-26T02:23:00.000","Title":"How I get the error log generates from a flask app installed on CPanel?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have just started learning backend dev using django. My question is do I just commit the project files in the server folder alone, or should I also commit the .env folder to the repository?\nI have done the following:\n\nI have created virtual environment and I have also installed django in venv. \nI have setup a django server and super admin.\nI have setup the config.json to protect my API key.\nIncluded the same in .gitignore.\n\nWhat happens if I do or do not commit .env?","AnswerCount":2,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":11868,"Q_Id":56765051,"Users Score":6,"Answer":"Assuming that your .env folder is your virtual environment, no you should not commit it.\nThe virtual environment should be rebuilt on the server using your requirements.txt file. The local environment you built on your development machine may have operating system specific binaries, and other compiled code that was generated for your local environment. \nThe server will have different compiled binaries, and therefore should rebuild the virtual environment using: pip install -r requirements.txt.","Q_Score":7,"Tags":"python,git,virtualenv","A_Id":56765084,"CreationDate":"2019-06-26T04:09:00.000","Title":"Do I need to commit .env files into the repository?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"This is a question on a conceptual level. \nI'm building a piece of small-scale algorithmic trading software, and I am wondering how I should set up the data collection\/retrieval within that system. The system should be fully autonomous. \nCurrently my algorithm that I want to trade live is doing so on a very low frequency, however I would like to be able to trade with higher frequency in the future and therefore I think that it would be a good idea to set up the data collection using a websocket to get real time trades straight away. I can aggregate these later if need be. \nMy first question is: considering the fact that the data will be real time, can I use a CSV-file for storage in the beginning, or would you recommend something more substantial?\nIn any case, the data collection would proceed as a daemon in my application. \nMy second question is: are there any frameworks available to handle real-time incoming data to keep the database constant while the rest of the software is querying it to avoid conflicts?\nMy third and final question is: do you believe it is a wise approach to use a websocket in this case or would it be better to query every time data is needed for the application?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":88,"Q_Id":56769559,"Users Score":0,"Answer":"CSV is a nice exchange format, but as it is based on a text file, it is not good for real-time updates. Only my opinion but I cannot imagine a reason to prefere that to database.\nIn order to handle real time conflicts, you will later need a professional grade database. PostgreSQL has the reputation of being robust, MariaDB is probably a correct choice too. You could use a liter database in development mode like SQLite, but beware of the slight differences: it is easy to write something that will work on one database and will break on another one. On another hand, if portability across databases is important, you should use at least 2 databases: one at development time and a different one at integration time.\nA question to ask yourself immediately is whether you want a relational database or a noSQL one. Former ensures ACID (Atomicity, Consistency, Isolation, Durability) transations, the latter offers greater scalability.","Q_Score":0,"Tags":"python,database,algorithmic-trading","A_Id":56769956,"CreationDate":"2019-06-26T09:33:00.000","Title":"How to set up data collection for small-scale algorithmic trading software","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Flask to build a REST API.\nI noticed that it didn't complain when I launched the app with no secret_key. Even in production mode.\nI thought Flask used to complain in this case. Maybe I'm confused with another warning.\nAnyway, what could be the consequences?\nCan this trigger exceptions at runtime?\nThe API doesn't use sessions at all, so I don't see what it could need a secret key for.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":139,"Q_Id":56773559,"Users Score":0,"Answer":"As long as sessions are not used, Flask won't complain and there is no need for a secret key.\nWhen a secret key is needed, Flask will crash at runtime if none is provided.\nThere is no security risk with providing no secret key in the sense of the concern expressed in the question (Flask lowering security due to the missing key). The worst that can happen is seeing the application crash at runtime.","Q_Score":0,"Tags":"python,flask","A_Id":68160485,"CreationDate":"2019-06-26T13:07:00.000","Title":"How bad is it to run Flask without a secret key?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have silly question about efficiency of django.\nI will build application based on templates and using API.\nWhich option will be better?\n1) 1 server, 1 django (template+djangorestframework in one running framework)\n2) 1 server, 1 djangorestframework or flask api, 1 django template","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":23,"Q_Id":56774025,"Users Score":0,"Answer":"For me the first solution is more simple and the efficience is similar.","Q_Score":0,"Tags":"python,django","A_Id":56775136,"CreationDate":"2019-06-26T13:29:00.000","Title":"Django build efficiency with API","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am making a website to get to know aws and Django better. The idea is to let a user upload an excel file, convert it to csv and then let the user download the converted csv file. \nI am using amazon s3 for file storage. My question is, what is the best way to make the conversion? Is there any way to access the excel file once it is stored in the s3 bucket and convert it to csv via Django? Sorry if my question is silly but I haven\u2019t been able to find much information on that online. Thanks in advance","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1128,"Q_Id":56777595,"Users Score":0,"Answer":"On every put event of Bucket you can trigger a AWS Lambda function which will convert your File format and save in desired bucket location.","Q_Score":0,"Tags":"python,django,amazon-web-services,amazon-s3,file-conversion","A_Id":56777922,"CreationDate":"2019-06-26T16:45:00.000","Title":"What is the best way to convert a file in amazon s3 with Django\/python?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have to create a form with a lot of fields in it. I don't want the user to scroll all the way down to complete the form and save. I need the user to fill in the fields in the window and click next to fill the next set of fields. How do i create a form view that does this? i've searched for forms with multiple steps in odoo and couldn't find an example.Can anyone please help?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":812,"Q_Id":56796027,"Users Score":0,"Answer":"I think you can create a form with multiple states and the fields and buttons can be subjected to visible\/invisible according to the states.It is better to add states using widget \"statusbar\"","Q_Score":1,"Tags":"python,xml,odoo,odoo-12","A_Id":56831719,"CreationDate":"2019-06-27T17:27:00.000","Title":"How do i create a multi step form in odoo","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to load a model on AWS lambda using Zappa. The problem is that the total unzipped file size from the package created by Zappa and uploaded to S3 is about 550mb, which exceeds the limit. One of the packages I'm using is Spacy (an NLP dependency that is very large), and I'm able to reduce the size of this package by manually removing unused languages in the lang folder. Doing this I can get the unzipped file size under 500mb. Problem is that Zappa automatically downloads the full Spacy version (spacy==2.1.4: Using locally cached manylinux wheel) on deploy and update. \nI've learned that I can call Zappa Package, and it will generate a package that I can then upload myself. What I've done is unzipped the generated package and removed the unnecessary lang files, then I zipped it back up. Is it possible for me to call Zappa Deploy\/Update and use the modified package and handler that was created by Zappa Package? This way Zappa can still handle the deployment.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":547,"Q_Id":56796521,"Users Score":0,"Answer":"Here's how I solved the issue, there are two ways:\n\nThe first is to simply move the dependency folder from the\nsite-packages directory to the root folder, and then make any\nmodifications there. This will force zappa to not download a wheels on linux version of the dependency upon upload \nThe simpler solution is to remove the *dist folder for a\nspecific module that you modify. Removing this will force zappa to bypass re-downlading modules from wheels on linux; meaning your modified module will be packaged during deployment.","Q_Score":1,"Tags":"python-3.x,amazon-web-services,aws-lambda,spacy,zappa","A_Id":59536598,"CreationDate":"2019-06-27T18:04:00.000","Title":"Can Zappa Update be used with the output package from Zappa Package?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am asking this because I don't want to use Javascript; instead I want to use Python as an alternative.\nIf this is not possible, please give an alternative apart from jQuery.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":1911,"Q_Id":56820558,"Users Score":1,"Answer":"Yes.You can first you need to download XMAPP AND Python3 then open XMAPP -> apache config notepad will be open then find AddHandler.  AddHandler-> AddHandler cgi-script.cgi.pl.asp.py -> save it.Then the .py extension created.","Q_Score":1,"Tags":"javascript,python,html","A_Id":56820729,"CreationDate":"2019-06-29T20:09:00.000","Title":"Can I use Python instead of Javascript in front-end development?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Basically I want to store a buttons service server-side that way it can persist through browser closes and page refresh.\nHere's what the user is trying to do\n\nThe user searches in a search bar for a list of products.\nWhen the results show up, they are shown a button that triggers an action for each individual product. They are also shown a master button that can trigger the same action for each product that is listed.\nUpon clicking the button, I want to disable it for 30 seconds and have this persist through page refreshes and browser close.\n\nWhat I've done\nCurrently I have this implemented using AJAX calls on the client side, but if the page refreshes it resets the button and they can click it again. So I looked into using javascript's localStorage function, but in my situation it would be better just to store this on the server.\nWhat I think needs to happen\n\nCreate a model in my Django app for a button. Its attributes would be its status and maybe some meta data (last clicked, etc).\nWhenever the client requests a list of products, the views will send the list of products and it will be able to query the database for the respective button's status and implement a disabled attribute directly into the template.\nIf the button is available to be pressed then the client side will make an AJAX POST call to the server and the server will check the buttons status. If it's available it will perform the action, update the buttons status to disabled for 30 seconds, and send this info back to the client in order to reflect it in the DOM.\n\nA couple questions\n\nIs it just a matter of creating a model for the buttons and then querying the database like normal?\nHow do I have Django update the database after 30 seconds to make a button's status go from disabled back to enabled?\nWhen the user presses the button it's going to make it disabled, but it will only be making it disabled in the database. What is the proper way to actually disable the button without a page refresh on the client side? Do I just disable the button in javascript for 30 seconds, and then if they try to refresh the page then the views will see the request for the list of products and it will check the database for each button's status and it will serve the button correctly?\n\nThank you very much for the help!!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":246,"Q_Id":56821634,"Users Score":1,"Answer":"Is it just a matter of creating a model for the buttons and then\n  querying the database like normal?\n\nModel could be something like Button (_id, last_clicked as timestamp, user_id)\nWhile querying you could simply sort by timestamp and LIMIT 1 to get the last click. By not overwriting the original value it would ensure a bit faster write. \nIf you don't want the buttons to behave similarly for each user you will have to create a mapping of the button with the user who clicked it. Even if your current requirements don't need them, create an extensible solution where mapping the user with this table is quite easy. \n\nHow do I have Django update the database after 30 seconds to make a\n  button's status go from disabled back to enabled?\n\nI avoid changing the database without a client request mapped to the change. This ensures the concurrency and access controls. And also has higher predictability for the current state of data. Following that, I would suggest not to update the db after the time delta(30 sec). \nInstead of that you could simply compare the last_clicked timestamp and calculate the delta either server side before sending the response or in client side. \nThis decision could be important, consider a scenario when the client has a different time on his system than the server time.\n\nWhen the user presses the button it's going to make it disabled, but\n  it will only be making it disabled in the database. What is the proper\n  way to actually disable the button without a page refresh on the\n  client side? Do I just disable the button in javascript for 30\n  seconds, and then if they try to refresh the page then the views will\n  see the request for the list of products and it will check the\n  database for each button's status and it will serve the button\n  correctly?\n\nYou'd need to do a POST request to communicate the button press timestamp with the db. You'd also need to ensure that the POST request is successful as an unsuccessful request would not persist the data in case of browser closure. \nAfter doing the above two you could disable the button only from the client side without trying the get the button last_clicked timestamp.","Q_Score":0,"Tags":"javascript,python,django,ajax","A_Id":56827841,"CreationDate":"2019-06-30T00:14:00.000","Title":"How do I store information about a front-end button on the Django server?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have parsed the content of a file to a variable that looks like this;\n\nb'8,092436.csv,,20f85'\n\nI would now like to find out what kind of filetype this data is coming from, with;\n\nprint(magic.from_buffer(str(decoded, 'utf-8'), mime=True))\n\nThis prints;\n\napplication\/octet-stream\n\nAnyone know how I would be able to get a result saying 'csv'?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":458,"Q_Id":56833465,"Users Score":1,"Answer":"Use magic on the original file. \nYou also need to take into account that CSV is really just a text file that uses particular characters to delimit the content. There is no explicit identifier that indicates that the file is a CSV file. Even then the CSV module needs to be configured to use the appropriate delimiters.\nThe delimiter specification of a CSV file is either defined by your program or needs to be configured (see importing into Excel as an example, you are presented with a number of options to configure the type of CSV to import).","Q_Score":1,"Tags":"python","A_Id":56833965,"CreationDate":"2019-07-01T09:49:00.000","Title":"Python magic is not recognizing the correct content","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working with python flask's requests module. I have installed requests module using :\npip install requests\nAnd verified that requests module exists when I run :\npip list\nBut when I run my python application , I receive import Error for requests module.\nI noticed that pip is installing the module in C:\\Users\\xx\\Documents\\Projects\\Python\\Python3REST\\lib\\site-packages\\ folder BUT  the interpreter is looking for the module in C:\\Users\\xx\\Documents\\Projects\\Python\\Python3REST\\lib\\site-packages\\flask\\ folder.\nI have tried running the command :\npip install --install-option=\"Path to install in\" requests\nBut threw some other error. \nThe import error I am getting states :\nImportError: cannot import name 'requests' from 'flask'\n(C:\\Users\\xx\\Documents\\Projects\\Python\\Python3REST\\lib\\site-packages\\flask\\__init__.py)\nI am working in virtualenv in Windows 10. \nI appreciate any help I can get.\nThank you","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":5384,"Q_Id":56861605,"Users Score":1,"Answer":"what if you add that folder to your path? using sys.path.extend?","Q_Score":2,"Tags":"python,pip,virtualenv","A_Id":56861629,"CreationDate":"2019-07-03T00:52:00.000","Title":"pip list shows installed module but still getting import error","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a rather complex Flask project structure set up that uses blueprints to separate different \"modules\" from one another, and then different routes in each module. I now want to add socket functionalities to this project using the flask-socketio library. My goal is to assign each socket to it's own thread, managed by an object. The problem I am facing now is that I'm unsure how to properly separate the sockets from one another.\n(Please note that I am very deep in experimentation phase right now, I don't have a final concept yet and therefore no conclusive code snippets to show)\nFrom my understanding each socket has a unique socket-ID, which is stored in flask.request.sid while the context is within a socketio-event. That is great, because I can use this to match events to the open socket, meaning I know which \"disconnect\"-event belongs to which \"connect\"-event, since both have the same socket-ID if they are part of the same socket connection.\nNow the problems start though. I am attempting to find a way that based on which route the socket is called from the socket has different event handlers. Meaning the route ...\/admin\/a manages different events than ...\/admin\/b, because both routes lead to different logical parts of my web application. On an even larger scale, I only have one global socketio-object shared over all blueprints of my application. If I add an event handler to react to socket feedback of blueprint 1, I absolutely don't want blueprint 2 to be able to also trigger it with it's own sockets. \nWhat are the recommended ways of handling socket separation? Is that even something that's getting used in practise or do I have a fundamentally wrong understanding of how socket connections should be used in web applications?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":441,"Q_Id":56867887,"Users Score":2,"Answer":"If you have different logical groups of socket events that you want to be independent of each other, you can use a different namespace for each. In Socket.IO one or more namespaces can be multiplexed on the same physical transport.\nIf you prefer something simpler, just avoid conflicts in the name that you assign to your events.","Q_Score":1,"Tags":"python,flask,socket.io,flask-socketio","A_Id":56878579,"CreationDate":"2019-07-03T10:18:00.000","Title":"How to separate sockets for logically separated Flask routes?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So in being a newb to Django I accidentally committed my secret key to a private repository that I have for my website. Considering that I intend to use this site for business purposes, I want to make sure that it is secure as possible. Do I need to generate a whole new Django Key? Or could I possibly just edit lets say, 10 characters of the secret key, add the edited secret key to my .env file, add the .env to my .gitignore file and call it a day? \nI recognize this is not the best approach. I will most likely completely generate a new secret key but I thought this might be an effective quick fix. \nI figure that by doing it this way the new secret key is still randomly generated and the old one is still available on github but useless to anyone who happens to scrape it. \nFYI I am using python-decouple with a .env file which is where I save all my secret variables (aws info, secret key, db info, etc.). I have separate settings files (production.py, development.py, common_settings.py) where both production.py and development.py import all of the data from common_settings.py. I just happened to forget to delete the original settings.py file before I made my first commit.","AnswerCount":4,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":3533,"Q_Id":56874713,"Users Score":0,"Answer":"I ended up just creating a new key from the site @aaronkazah provided. If you look in the comments under @phd you'll get better clarification on my issue. Not a good reason to provide a quick fix when the best way to do it is to just create a new key. It took seconds. Thanks for the help everyone.","Q_Score":0,"Tags":"django,python-3.x,git,secret-key","A_Id":56875242,"CreationDate":"2019-07-03T16:43:00.000","Title":"Django 2.3: I committed my secret key to a private repository. Can I just edit the secret key myself and then add .env file to .gitignore?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So in being a newb to Django I accidentally committed my secret key to a private repository that I have for my website. Considering that I intend to use this site for business purposes, I want to make sure that it is secure as possible. Do I need to generate a whole new Django Key? Or could I possibly just edit lets say, 10 characters of the secret key, add the edited secret key to my .env file, add the .env to my .gitignore file and call it a day? \nI recognize this is not the best approach. I will most likely completely generate a new secret key but I thought this might be an effective quick fix. \nI figure that by doing it this way the new secret key is still randomly generated and the old one is still available on github but useless to anyone who happens to scrape it. \nFYI I am using python-decouple with a .env file which is where I save all my secret variables (aws info, secret key, db info, etc.). I have separate settings files (production.py, development.py, common_settings.py) where both production.py and development.py import all of the data from common_settings.py. I just happened to forget to delete the original settings.py file before I made my first commit.","AnswerCount":4,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":3533,"Q_Id":56874713,"Users Score":0,"Answer":"I have tried the same thing but unfortunately it doesn't work for me.\n\nInstall dotenv package: pip install -U python-dotenv\nImport this package and call your .env variable: from dotenv import load_dotenv\n\nExample is below\nfrom dotenv import load_dotenv   #for python-dotenv method\n\nload_dotenv()                    #for python-dotenv method\n\nimport os \n\nuser_name = os.environ.get('USER')\npassword = os.environ.get('password')\n\nprint(user_name, password)\nOutput\nusername password","Q_Score":0,"Tags":"django,python-3.x,git,secret-key","A_Id":65166644,"CreationDate":"2019-07-03T16:43:00.000","Title":"Django 2.3: I committed my secret key to a private repository. Can I just edit the secret key myself and then add .env file to .gitignore?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to run a python script in Google Cloud which will download 50GB of data once a day to a storage bucket. That download might take longer than the timeout limit on the Google Cloud Functions which is set to 9 minutes.\nThe request to invoke the python function is triggered by HTTP.\nIs there a way around this problem ? I don't need to run a HTTP Restful service as this is called once a day from an external source. (Can't be scheduled) .\nThe whole premise is do download the big chuck of data directly to the cloud. \nThanks for any suggestions.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1242,"Q_Id":56888434,"Users Score":2,"Answer":"9 minutes is a hard limit for Cloud Functions that can't be exceeded.  If you can't split up your work into smaller units, one for each function invocation, consider using a different product.  Cloud Run limits to 15 minutes, and Compute Engine has no limit that would apply to you.","Q_Score":4,"Tags":"python,google-cloud-functions,long-running-processes","A_Id":56888658,"CreationDate":"2019-07-04T12:55:00.000","Title":"Long running python process with Google Cloud Functions","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"When I did 'makemigrations' on 'django', the generated file became 'unversioned files'. \nI don't know why.\nHow can I change this unversioned one to versioned files?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":142,"Q_Id":56895286,"Users Score":0,"Answer":"Add your unversioned files in your git branch.\n$ git add unversioned files name","Q_Score":1,"Tags":"python,django,pycharm","A_Id":56897982,"CreationDate":"2019-07-05T00:26:00.000","Title":"Django: pycharm: unversioned files","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"When I did 'makemigrations' on 'django', the generated file became 'unversioned files'. \nI don't know why.\nHow can I change this unversioned one to versioned files?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":142,"Q_Id":56895286,"Users Score":0,"Answer":"In PyCharm, right-click the file and select \"Git | Add\" from the context menu, or drag & drop it from the unversioned files node to a changelist.","Q_Score":1,"Tags":"python,django,pycharm","A_Id":56904670,"CreationDate":"2019-07-05T00:26:00.000","Title":"Django: pycharm: unversioned files","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am looking for code to extract only the titles from every power point slides. Is there any python function available. Any help is appreciated.","AnswerCount":2,"Available Count":1,"Score":-0.0996679946,"is_accepted":false,"ViewCount":1864,"Q_Id":56896747,"Users Score":-1,"Answer":"in previous versions there was a function like this buitl-in. But it has been abandoned.\nBut if you right click in the Outline view you can choose collapse all, which will give you only the highest level. Then you can copy paste, the slide number of course will not be there, but if you paste to Word every title will be a paragraph so applying a number should do it","Q_Score":2,"Tags":"python,python-3.x,computer-vision,python-pptx,heading","A_Id":60955461,"CreationDate":"2019-07-05T04:54:00.000","Title":"extract all the headings(titles) from a ppt slides","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm new to asynchronous tasks and I'm using django-celery and was hoping to use django-celery-beat to schedule periodic tasks.\nHowever it looks like celery-beat doesn't pick up one-off tasks. Do I need two Celery instances, one as a worker for one off tasks and one as beat for scheduled tasks for this to work?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1283,"Q_Id":56897657,"Users Score":0,"Answer":"Pass -B parameter to your worker, it is a parameter to run beat schedule. This worker will do all other tasks, the ones sent from beat, and the \"one-off\" ones, it really doesn't matter for worker.\nSo the full command looks like:\ncelery -A flock.celery worker -l DEBUG -BE.","Q_Score":1,"Tags":"python,django,celery,django-celery","A_Id":62809186,"CreationDate":"2019-07-05T06:31:00.000","Title":"Django Celery & Django-Celery-Beat","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am trying to call the PowerModels julia package in python. I have successfully downloaded julia, installed the PowerModels package (ran a successful test in julia), set the ENV[\"PYTHON\"] to \"C:\/Users\/user1\/Anaconda3\/python.exe\", added the PyCall package. Added the bin file of julia to the system variable. Then installed pyjulia using Anaconda.\nWhen I open the python.exe file located in \"C:\/Users\/user1\/Anaconda3\/python.exe\" I can successfully call from julia.PowerModels import run_ac_opf. However when I try to do it from Spyder, Jupyter, or python in Anaconda base I get an error that the procedure entry point cannot be located in the dynamic link library LLVM.dll of julia.\nI am using windows 10, any help is appreciated.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":492,"Q_Id":56908955,"Users Score":0,"Answer":"If you have multiple installations (thus multiple python.exe files) it is good to check that they are all using the same python.exe interpreter.\nI would try to include the directory containing julia's LLVM.dll in the windows environment variable PATH.","Q_Score":0,"Tags":"python-3.x,julia","A_Id":56933012,"CreationDate":"2019-07-05T20:32:00.000","Title":"Using Julia in Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a task that need to connect Odoo 11 with biometric device to solve the problem about attendance. I searched google a lot but nothing can help me and all of document is about connect with \"ZK Teco\" device. But if another device, is it posible? And what technology in Odoo 11 that i can do to connect? Any suggest for me? Thanks in advance","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":273,"Q_Id":56910961,"Users Score":0,"Answer":"All biometric devices should be having a database which stores all the relevant data. First find out how does the biometric device store data. If it is in SQL database, you can use SQL commands to retrieve data. One of my client was using an access file and was not ready to move to a SQL database. So I just read the data from the access file itself. So find out how it stores data first.","Q_Score":0,"Tags":"python-3.6,odoo-11","A_Id":56911097,"CreationDate":"2019-07-06T03:14:00.000","Title":"How to connect Odoo 11 with biometric device ( Not ZK device )","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have been trying to use python 3 for text mining on a 650 MB csv file, which my computer was not powerful enough to do. My second solution was to reach out to google cloud. I have set up my VMs and my jupyter notebook on google cloud, and it works perfectly well. The problem, however, is that I am in constant fear of getting disconnected. As a matter of fact, my connection with google server was lost a couple of time and so was my whole work.\nMy question: Is there a way to have the cloud run my code without fear of getting disconnected? I need to be able to have access to my csv file and also the output file.\nI know there is more than one way to do this and have read a lot of material. However, they are too technical for a beginner like me to understand. I really appreciate a more dummy-friendly version. Thanks!\nUPDATE: here is how I get access to my jupyter notebook on google cloud:\n1- I run my instance on google cloud\n2- I click on SSH \n3- in the window that appears, I type the following:\njupyter notebook --ip=0.0.0.0 --port=8888 --no-browser &\nI have seen people recommend to add nohup to the beginning of the same commend. I have tried it and got this message:\nnohup: ignoring input and appending output to 'nohup.out'\nAnd nothing happens.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":627,"Q_Id":56916897,"Users Score":8,"Answer":"If I understand your problem correctly, you could just run the program inside a screen instance:\nAfter connecting via ssh type screen\nRun your command\nPress ctrl + a, ctrl + d\nNow you can disconnect from ssh and your code will continue to run. You can reconnect to the screen via screen -r","Q_Score":2,"Tags":"python,google-cloud-platform","A_Id":56917173,"CreationDate":"2019-07-06T19:03:00.000","Title":"how to run my python code on google cloud without fear of getting disconnected - an absolute beginner?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a list of about 100 HTML webpages (all have different structures, such as divs, anchors, classes, etc.) and I am trying to scrape the title of each page (where the title is under a certain div and class). To do this, I was using get requests and Beautifulsoup, however, this takes way to long (10 minutes every time I want to do it)!\nI used a timer to see what is taking the most time: it's the get requests. Apparently Python (3.7) executes the code one after another, and since each get request takes about 5-6 seconds, it's taking approximately 500-600 seconds to complete the ~100 requests. \nI've searched for ways to make these requests work faster and came across many different solutions. However, a common theme seemed to be that making my requests asynchronous (so all requests start at the same time) will solve the problem (by making it faster).\nThere were many possible solutions for doing this that I read online including: multithreading, using grequest, using Scrapy, parsing lxml, etc. However, I'm new to programming and am not skilled enough to learn and experiment with each way (in fact, I tried following the answers to similar questions on SO, but wasn't successful), so I am unsure what is the best route for me to take. \nI don't need anything fancy; all I want to do is extract the titles from the HTML documents as text and then print them out. I don't need to download any CSS files, images, media, etc. Also, I'm hoping to keep the code as simple\/bare as possible. How can I do this as fast as possible in Python? I'd appreciate it if someone could suggest the best path to take (i.e. using Scrapy), and give a short explanation of what I must do using that tool to get the results I'm hoping for. You don't have to write out the whole code for me. Thanks!","AnswerCount":3,"Available Count":1,"Score":0.0665680765,"is_accepted":false,"ViewCount":154,"Q_Id":56928294,"Users Score":1,"Answer":"One of the idea which I can suggest is taking all the urls in Csv and keep few headings like path,title div,body div, image div as per your requirement and keep adding the particular div(div class=\u201dtitle\u201d).\nEx:\n       PATH       TITLE DIV                IMAGE DIV              BODY DIV \nSimilarly, you can give all links in one csv file nd read it through python script so that all data is pulled.","Q_Score":1,"Tags":"python,html,parsing,web-scraping,scrapy","A_Id":56928682,"CreationDate":"2019-07-08T04:05:00.000","Title":"How to scrape many HTML documents quickly using Python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I use a custom user model(AbstractBaseUser). How to allow inactive user to login?.  Model fields are email , active, admin,.....\nBy default active= false. For email confirmation activation. But I want to allow user to login both with active= true or false.","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":1113,"Q_Id":56933463,"Users Score":2,"Answer":"I suggest you to keep the is active functionality and set the default value to True and create migration which will update value for currently inactive users. By following such approach you still have is active functionality, which may serve you in the moment when you will have to deactivate user.\nTo keep tracking on email confirmation just introduce new field is_email_confirmed and update the view which handles click on email to set that field to true.","Q_Score":2,"Tags":"python,django,web,django-rest-framework,web-site-project","A_Id":56933610,"CreationDate":"2019-07-08T10:59:00.000","Title":"How to allow inactive user to login?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Hello I am developing a web scraper and I am using in a particular website, this website has a lot of URLs, maybe more than 1.000.000, and for scraping and getting the information I have the following architecture.\nOne set to store the visited sites and another set to store the non-visited sites.\nFor scraping the website I am using multithreading with a limit of 2000 threads.\nThis architecture has a problem with a memory size and can never finish because the program exceeds the memory with the URLs\nBefore putting a URL in the set of non-visited, I check first if this site is in visited, if the site was visited then I will never store in the non-visited sites.\nFor doing this I am using python, I think that maybe a better approach would be storing all sites in a database, but I fear that this can be slow\nI can fix part of the problem by storing the set of visited URLs in a database like SQLite, but the problem is that the set of the non-visited URL is too big and exceeds all memory\nAny idea about how to improve this, with another tool, language, architecture, etc...?\nThanks","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":108,"Q_Id":56938689,"Users Score":1,"Answer":"At first, i never crawled pages using Python. My preferd language is c#. But python should be good, or better.\nOk, the first thing your detected is quiet important. Just operating on your memory will NOT work. Implementing a way to work on your harddrive is important. If you just want to work on memory, think about the size of the page.\nIn my opinion, you already got the best(or a good) architecture for webscraping\/crawling. You need some kind of list, which represents the urls you already visited and another list in which you could store the new urls your found. Just two lists is the simplest way you could go. Cause that means, you are not implementing some kind of strategy in crawling. If you are not looking for something like that, ok. But think about it, because that could optimize the usage of memory. Therefor you should look for something like deep and wide crawl. Or recursive crawl. Representing each branch as a own list, or a dimension of an array.\nFurther, what is the problem with storing your not visited urls in a database too? Cause you only need on each thread. If your problem with putting it in db is the fact, that it could need some time swiping through it, then you should think about using multiple tables for each part of the page.\nThat means, you could use one table for each substring in url:\nwwww.example.com\/\nwwww.example.com\/contact\/\nwwww.example.com\/download\/\nwwww.example.com\/content\/\nwwww.example.com\/support\/\nwwww.example.com\/news\/\nSo if your url is:\"wwww.example.com\/download\/sweetcats\/\", then you should put it in the table for wwww.example.com\/download\/.\nWhen you have a set of urls, then you have to look at first for the correct table. Afterwards you can swipe through the table.\nAnd at the end, i have just one question. Why are you not using a library or a framework which already supports these features? I think there should be something available for python.","Q_Score":0,"Tags":"python,performance,web-scraping,architecture","A_Id":56953619,"CreationDate":"2019-07-08T16:03:00.000","Title":"What is the best approach to scrape a big website?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Hello I am developing a web scraper and I am using in a particular website, this website has a lot of URLs, maybe more than 1.000.000, and for scraping and getting the information I have the following architecture.\nOne set to store the visited sites and another set to store the non-visited sites.\nFor scraping the website I am using multithreading with a limit of 2000 threads.\nThis architecture has a problem with a memory size and can never finish because the program exceeds the memory with the URLs\nBefore putting a URL in the set of non-visited, I check first if this site is in visited, if the site was visited then I will never store in the non-visited sites.\nFor doing this I am using python, I think that maybe a better approach would be storing all sites in a database, but I fear that this can be slow\nI can fix part of the problem by storing the set of visited URLs in a database like SQLite, but the problem is that the set of the non-visited URL is too big and exceeds all memory\nAny idea about how to improve this, with another tool, language, architecture, etc...?\nThanks","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":108,"Q_Id":56938689,"Users Score":1,"Answer":"2000 threads is too many.  Even 1 may be too many.  Your scraper will probably be thought of as a DOS (Denial Of Service) attach and your IP address will be blocked.\nEven if you are allowed in, 2000 is too many threads.  You will bottleneck somewhere, and that chokepoint will probably lead to going slower than you could if you had some sane threading.  Suggest trying 10.  One way to look at it -- Each thread will flip-flop between fetching a URL (network intensive) and processing it (cpu intensive).  So, 2 times the number of CPUs is another likely limit.\nYou need a database under the covers.  This will let you top and restart the process.  More importantly, it will let you fix bugs and release a new crawler without necessarily throwing away all the scraped info.\nThe database will not be the slow part.  The main steps:\n\nPick a page to go for (and lock it in the database to avoid redundancy).\nFetch the page (this is perhaps the slowest part)\nParse the page (or this could be the slowest)\nStore the results in the database\nRepeat until no further pages -- which may be never, since the pages will be changing out from under you.\n\n(I did this many years ago.  I had a tiny 0.5GB machine.  I quit after about a million analyzed pages.  There were still about a million pages waiting to be scanned.  And, yes, I was accused of a DOS attack.)","Q_Score":0,"Tags":"python,performance,web-scraping,architecture","A_Id":57539538,"CreationDate":"2019-07-08T16:03:00.000","Title":"What is the best approach to scrape a big website?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to run some tasks in the background while running a django server. To do this, I'm using background-tasks library. I've followed the following steps:\n\npip install django-background-tasks\nAdded 'background_task', in INSTALLED_APPS in settings.py \npython manage.py makemigrations background_task\n\nThe problem arises in the 3rd step giving an error stating:\n\ndjango.db.utils.ProgrammingError: relation \"background_task\" does not\n  exist LINE 1: INSERT INTO \"background_task\" (\"task_name\",\n  \"task_params\", \"...\n\nI've tried looking for other solutions but every one of them was the 3rd line. \nHow should I proceed ?","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":864,"Q_Id":56949235,"Users Score":1,"Answer":"I don't know if this is still valid question but what helped me was to revert all changes in code related to background_task module and then applying migrations. After that reapply your changes in code and it should all work.","Q_Score":1,"Tags":"python,django","A_Id":61407058,"CreationDate":"2019-07-09T09:17:00.000","Title":"relation \"background_task\" does not exist","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to run some tasks in the background while running a django server. To do this, I'm using background-tasks library. I've followed the following steps:\n\npip install django-background-tasks\nAdded 'background_task', in INSTALLED_APPS in settings.py \npython manage.py makemigrations background_task\n\nThe problem arises in the 3rd step giving an error stating:\n\ndjango.db.utils.ProgrammingError: relation \"background_task\" does not\n  exist LINE 1: INSERT INTO \"background_task\" (\"task_name\",\n  \"task_params\", \"...\n\nI've tried looking for other solutions but every one of them was the 3rd line. \nHow should I proceed ?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":864,"Q_Id":56949235,"Users Score":0,"Answer":"After the 2nd step go to command line and do following :\n1. python manage.py showmigrations (check if it works fine)\n2. python manage.py migrate (check if the background task file is added to the show migrations list eg:\nbackground_task\n [X] 0001_initial\n [X] 0002_auto_20170927_1109)\n3. Now make modifications in your views in which ever way you want to use the backgroundtasks.","Q_Score":1,"Tags":"python,django","A_Id":57952100,"CreationDate":"2019-07-09T09:17:00.000","Title":"relation \"background_task\" does not exist","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm purposefully modifying every locally synced files (although directory name is unique and unmodified), which makes the sync method try to redownload the whole bucket, taking an excess of time.\nCopying the local files (to preserve their timestamp + size) isn't really an option since the bucket size is so big, and AWS sync docs don't seem to have an option to exclude modified files.\nI was hoping there's a way to prevent attempting to redownload a directory if it exists locally.\nAny ideas?\nThanks a lot","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":416,"Q_Id":56960781,"Users Score":0,"Answer":"Would aws s3 sync --size-only work for you?\n\n--size-only (boolean) Makes the size of each key the only criteria used to decide whether to sync from source to destination.\n\n(Emphasis mine.)","Q_Score":2,"Tags":"python,amazon-web-services,amazon-s3","A_Id":56960874,"CreationDate":"2019-07-09T21:33:00.000","Title":"AWS S3 sync method- possible to ignore modified files completely?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want be add a video field in the django.I am not able to add it.\nHow can I add a videofield in django in the admin portion like that of ImageFeild?","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":7651,"Q_Id":56969479,"Users Score":0,"Answer":"You have to use the FileField in the same way you use the ImageField","Q_Score":1,"Tags":"python,django,video","A_Id":64042041,"CreationDate":"2019-07-10T11:12:00.000","Title":"Adding Video Field in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am currently developing a proprietary PDF parser that can read multiple types of documents with various types of data. Before starting, I was thinking about if reading PowerPoint slides was possible. My employer uses presentation guidelines that requires imagery and background designs - is it possible to build a parser that can read the data from these PowerPoint PDFs without the slide decor getting in the way? \nSo the workflow would basically be this:\n\nAt the end of a project, the project report is delivered in the form of a presentation. \nThe presentation would be converted to PDF.\nThe PDF would be submitted to my application.\nThe application would read the slides and create a data-focused report for quick review.\n\nThe goal of the application is to cut down on the amount of reading that needs to be done by a significant amount as some of these presentation reports can be many pages long with not enough time in the day.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":201,"Q_Id":56975372,"Users Score":0,"Answer":"A PowerPoint PDF isn't a type of PDF.\nThere isn't going to be anything natively in the PDF that identifies elements on the page as being 'slide' graphics the originated from a PowerPoint file for example.\nYou could try building an algorithm that makes decision about content to drop from the created PDF but that would be tricky and seems like the wrong approach to me.\nA better approach would be to \"Export\" the PPT to text first, e.g. in Microsoft PowerPoint Export it to a RTF file so you get all of the text out and use that directly or then convert that to PDF.","Q_Score":0,"Tags":"python,parsing,pdf,pdf-scraping","A_Id":56994393,"CreationDate":"2019-07-10T16:55:00.000","Title":"Is it possible for a PDF data parser to read PowerPoint PDFs?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"To preface: I'm very very new to Flask\/web frameworks and all.\nFor some CS schoolwork, I'm supposed to develop an application of some form for a teacher. What I have chosen to use to develop it is Flask. However, the teacher I'm sending it to is unfamiliar with Python and probably doesn't have any Flask dependencies or anything installed. So I was wondering if there was a way for me to send him something (like a .pyc) which will locally host\/run the flask app on his computer easily? For the purposes of testing it and all prior to hosting it.","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1247,"Q_Id":56980597,"Users Score":0,"Answer":"You can use CZ_FREEZE package that converts your FLASK project into a sharable cross-platform app, such that the receiving end doesn't need to install the essential libraries first.\n\nFirst, install the cz_freeze library using,\npip install cz_Freeze\nThen in your main project folder create a setup.py file containing the following code,\nfrom cx_Freeze import setup, Executable\n# Include the name of all folder or files in your project folder that is necessary for the project excluding your main flask file.\n# If there are multiple files, you can add them into a folder and then specify the folder name.\n# In place of main.py file add your main flask file name\nincludefiles = [ 'templates', 'static', 'some_other_file.py']\nincludes = [ 'jinja2' , 'jinja2.ext'] \nexcludes = ['Tkinter']\nsetup(\nname='Sample Flask App',\nversion = '0.1',\ndescription = 'Sample Flask App',\noptions = {'build_exe':   {'excludes':excludes,'include_files':includefiles, 'includes':includes}},\nexecutables = [Executable('main.py')]\n)\nNow from the terminal run,\npython setup.py build\nNow there should be a folder created with name build containing all the files that you mentioned as well as the packages of your virtual environment.\nRun the project using the script file with the name of your main flask file.","Q_Score":1,"Tags":"python,flask","A_Id":62019434,"CreationDate":"2019-07-11T01:43:00.000","Title":"Is there a way to send a flask app to be run by someone who doesn't have any of the stuff installed?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it okay to make changes to the django packages?\nFor instance in my project I have a folder lib\/python2.7\/site-packages\/reversion\/\nAnd in here I want to add one method inside of models.py\nIs this correct?\nInitially I wanted to edit django's admin history page. In some models history change messages are shown in unicode format, but I need it to be string readable. In models.py I used eval function to transfer unicode to python list.","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":396,"Q_Id":56986127,"Users Score":2,"Answer":"No, this is not a good practice.\nIn general there is other way to edit the default feature (inheritance, write your own page, etc...).\nThis is because if you modify the django package this becomes difficult to maintain and update.\nBut if it is a small project you can try to edit django package.","Q_Score":0,"Tags":"python,django,django-admin","A_Id":56986532,"CreationDate":"2019-07-11T09:34:00.000","Title":"Can we make changes to the django packages","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have prototyped a system using python on linux. I am now designing the architecture to move to a web based system. I will use Django to serve public and private admin pages. I also need a service running, which will periodically run scripts, connect to the internet and allow API messaging with an admin user. Thus there will be 3 components : web server, api_service and database.\n1) What is best mechanism for deploying a python api_service on the VM? My background is mainly C++\/C# and I would have usually deployed a C#-written service on the same VM as the web server and used some sort of TCP messaging wrapper for the API. My admin API code will be ad hoc python scripts run from my machine to execute functionality in this service.\n2) All my database code is written to an interface that presently uses flat-files. Any database suggestion? PostgreSQL, MongoDB, ...\nMany thanks in advance for helpful suggestions. I am an ex-windows\/C++\/C# developer who now absolutely loves Python\/Cython and needs a little help please ...","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":28,"Q_Id":56987431,"Users Score":0,"Answer":"Right, am answering my own question. Have done a fair bit of research since posting.\n2) PostgreSQL seems a good choice. There seem to be no damning warnings against using it and there is much searchable help. I am therefore implementing concrete PostgreSQL classes to implement my serialization interfaces.\n1) Rather than implement my own service in python that sits on a remote machine, I am going to use Celery. RabbitMQ will act as the distributed TCP message wrapper. I can put required functionality in python scripts on the VM that Celery can find and execute as tasks. I can run these Celery tasks in 3 ways. i) A web request through Django can queue a task. ii) I can manually queue a remote Celery task from my machine by running a python script. iii) I can use Celery Beat to schedule tasks periodically. This fits my needs perfectly as I have a handful of daily\/periodic tasks that can be scheduled plus a few rare maintenance tasks that I can fire off from my machine.\nTo summarize then, where before I would have created a windows service that handled both incoming TCP commands and scheduled behaviour, I can use RabbitMQ, Celery, Celery Beat and python scripts that sit on the VM.\nHope this helps anybody with a similar 'how to get started' problem .....","Q_Score":0,"Tags":"python,django","A_Id":57042276,"CreationDate":"2019-07-11T10:44:00.000","Title":"Suggestions for web deployment of prototype","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was trying to install Django. Turns out that course's teacher said that we will be working with Python 3.6\nI install Python 3.6. Now it's my default, it somewhat replaced the last version I had; which is Python 3.5.\nEverything ok until that. But when I want to install Django doing\n\"pip3 install django\", it tells me that the module is already satisfied and therefore installed.\nI run \"python3\" command into my terminal. It runs Python 3.6. I try to import Django, and boom... \"No module named 'django'\".\nThen I realized pip3 was actually installing my modules into Python 3.5 and not 3.6. So what I do is to install pip in Python 3.6. \nI download get-pip.py and proceed to execute it with Python 3.6 typing in \"python3.6 get-pip.py\". \nHere is when the damn \"zipimport.ZipImportError: can't decompress data; zlib not available\" goes in. I've tried a ton of things and no one of them fixed the %^$! problem. I'm really tired.\nWhat I have already tried:\npython3.6 -m pip install django, which output is \"\/usr\/local\/bin\/python3.6: No module named pip\"\napt install zlib, which output is \"E: Unable to locate package zlib\"\napt install zlib1g-dev, which says that it's already installed; the problem persists though.","AnswerCount":4,"Available Count":3,"Score":0.049958375,"is_accepted":false,"ViewCount":9581,"Q_Id":56999217,"Users Score":1,"Answer":"Suggested solutions (installing zlib1g-dev or zlib-devel) seem to resolve the issue in most cases. Here is one edge case I've encountered recently: whatever you are trying to run might use zlib via symlink which might be broken.\nIn my case I was trying to run a build of a 3rd-party software which already had python and all necessary libs being emebedded into it. It was packaged as a tar.gz archive. Unpacking the archive on a Windows machine and then copying the contents to another linux machine destroyed all the symlinks (if you do ls -l in a folder with symlinks you would see that all of them have size 0 and do not point to anything). Copying tar.gz to the linux machine directly and unpacking it there resolved the issue.\nP.S. I know it's an edge case scenario but it took me and one more developer quite a while to figure it out so I think it's worth mentioning here, just in case someone gets as unlucky as I got.","Q_Score":8,"Tags":"python,django,python-3.x,pip,zlib","A_Id":67194445,"CreationDate":"2019-07-12T01:42:00.000","Title":"Can't fix \"zipimport.ZipImportError: can't decompress data; zlib not available\" when I type in \"python3.6 get-pip.py\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was trying to install Django. Turns out that course's teacher said that we will be working with Python 3.6\nI install Python 3.6. Now it's my default, it somewhat replaced the last version I had; which is Python 3.5.\nEverything ok until that. But when I want to install Django doing\n\"pip3 install django\", it tells me that the module is already satisfied and therefore installed.\nI run \"python3\" command into my terminal. It runs Python 3.6. I try to import Django, and boom... \"No module named 'django'\".\nThen I realized pip3 was actually installing my modules into Python 3.5 and not 3.6. So what I do is to install pip in Python 3.6. \nI download get-pip.py and proceed to execute it with Python 3.6 typing in \"python3.6 get-pip.py\". \nHere is when the damn \"zipimport.ZipImportError: can't decompress data; zlib not available\" goes in. I've tried a ton of things and no one of them fixed the %^$! problem. I'm really tired.\nWhat I have already tried:\npython3.6 -m pip install django, which output is \"\/usr\/local\/bin\/python3.6: No module named pip\"\napt install zlib, which output is \"E: Unable to locate package zlib\"\napt install zlib1g-dev, which says that it's already installed; the problem persists though.","AnswerCount":4,"Available Count":3,"Score":0.1488850336,"is_accepted":false,"ViewCount":9581,"Q_Id":56999217,"Users Score":3,"Answer":"For me it worked in RHEL:\n$ yum install zlib-devel","Q_Score":8,"Tags":"python,django,python-3.x,pip,zlib","A_Id":68827729,"CreationDate":"2019-07-12T01:42:00.000","Title":"Can't fix \"zipimport.ZipImportError: can't decompress data; zlib not available\" when I type in \"python3.6 get-pip.py\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was trying to install Django. Turns out that course's teacher said that we will be working with Python 3.6\nI install Python 3.6. Now it's my default, it somewhat replaced the last version I had; which is Python 3.5.\nEverything ok until that. But when I want to install Django doing\n\"pip3 install django\", it tells me that the module is already satisfied and therefore installed.\nI run \"python3\" command into my terminal. It runs Python 3.6. I try to import Django, and boom... \"No module named 'django'\".\nThen I realized pip3 was actually installing my modules into Python 3.5 and not 3.6. So what I do is to install pip in Python 3.6. \nI download get-pip.py and proceed to execute it with Python 3.6 typing in \"python3.6 get-pip.py\". \nHere is when the damn \"zipimport.ZipImportError: can't decompress data; zlib not available\" goes in. I've tried a ton of things and no one of them fixed the %^$! problem. I'm really tired.\nWhat I have already tried:\npython3.6 -m pip install django, which output is \"\/usr\/local\/bin\/python3.6: No module named pip\"\napt install zlib, which output is \"E: Unable to locate package zlib\"\napt install zlib1g-dev, which says that it's already installed; the problem persists though.","AnswerCount":4,"Available Count":3,"Score":0.049958375,"is_accepted":false,"ViewCount":9581,"Q_Id":56999217,"Users Score":1,"Answer":"Its solves my issue for centos 7.6 :-\nyum install zlib-deve","Q_Score":8,"Tags":"python,django,python-3.x,pip,zlib","A_Id":66745621,"CreationDate":"2019-07-12T01:42:00.000","Title":"Can't fix \"zipimport.ZipImportError: can't decompress data; zlib not available\" when I type in \"python3.6 get-pip.py\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am putting \"django-admin startproject mysite\". Project is creating in the folder of C:\\VTRoot\\HarddiskVolume3 by default instate of desire folder. Please help me out.\npip install django","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":811,"Q_Id":57016045,"Users Score":1,"Answer":"I had a similar issue but with a C# project on Windows machine.\nTry these steps if you have Comodo antivirus installed:\n\nOpen the comodo, select \"Unblock Applications\"\nFind your installer and unblock it.\nIf you have any other antivirus installed, I am not sure if the above steps work but there is no harm in trying.","Q_Score":1,"Tags":"django,python-3.x","A_Id":57483326,"CreationDate":"2019-07-13T04:08:00.000","Title":"Django project is creating into C:\\VTRoot\\HarddiskVolume3 by default","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am putting \"django-admin startproject mysite\". Project is creating in the folder of C:\\VTRoot\\HarddiskVolume3 by default instate of desire folder. Please help me out.\npip install django","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":811,"Q_Id":57016045,"Users Score":1,"Answer":"I am running on a PC that has Comodo managed by devops. I cannot control the settings without them being approved and implemented by someone else. But there is probably a folder where you can do this work if you are able to move to it.\nFor me, it was C:\\ProgramData\\Shared Space\nThis is a hidden directory. Use at your own risk!\nSummary: Comodo -> Settings -> Containment -> (Do not virtualize access to) the Specified files folders -> Expand Shared Spaces and see where it points.\nDetails:\nIn Comodo, if you open up the program from the taskbar, and then click on settings. You will see tabs on the left. Click on the one labeled \"Containment.\"\nHopefully a \"Shared Space\" has been made available for you to put this sort of work in that will not be virtualized \/ quarantined. \nLocate \"Do not virtualize access to the specified files\/folders\" Click on the link in that sentence.\nA dialog will open up that shows the shared spaces that have been defined. Expand that list and you will see where you can put files \/ folders that Comodo will ignore.","Q_Score":1,"Tags":"django,python-3.x","A_Id":57625888,"CreationDate":"2019-07-13T04:08:00.000","Title":"Django project is creating into C:\\VTRoot\\HarddiskVolume3 by default","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a view, and when user click on a button it gets called. But if a user clicks the button twice, it gets called for another even if the first is still executing or running.\nThis produces a problem (if I am correct), and that is: it stops execution for the first one and starts executing for the other. How can I stop this calling of views twice?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":228,"Q_Id":57019298,"Users Score":0,"Answer":"When a request has been sent to the server, Django will pick it up and send a response when it's finished. if there is no one there to receive the response then nothing happens but the processes have been done already. You should ask for verification if your process is important to be received.\nWhen the user sends the second request, both requests will be processed and will return a response. If you're working with an API and your frontend isn't rendered in the backend server then the user will probably receive both responses and depending on the code on the front side, many things can happen. they might see both responses or just one. or the first one might get updated instantly when the second response comes in.\nThis might lead to problems depending on the processes you are running. for example, if you are updating a record in a database and the update can only happen once, then probably you'll get an error in the second try. it is really really rare and mostly impossible that the update part for both requests happens in the exact same time depending on your database, your code, and many other things.\nThere are many ways to handle such a problem which most of them depends on many things but I'm gonna list you few of these options:\n1 - Change the display for the button to none so the user won't be able to click on it again. This is a very simple solution and works most of the times unless you have users trying to hurt your system intentionally.\n2 - Redirect the user to another page and then wait for a response there.\n3 - If your view is doing some heavy processes which are expensive to run, then just create a queue system with some limitations for each user. This is usually done in scaled projects with a lot of users.\n4 - Use a rate limiting system to deny too many requests at once or block any none normal traffic.","Q_Score":0,"Tags":"python,django,django-views","A_Id":57019481,"CreationDate":"2019-07-13T12:45:00.000","Title":"Django : Stop calling same view if it's already called","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to continuously display some data that I receive in a Flask Server in a GUI that I designed with PySimpleGUI. Currently my GUI and my Flask Server are two seperate projects, what would be the cleanest\/best practise method to connect them?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":424,"Q_Id":57035196,"Users Score":0,"Answer":"The way you \"receive data\" in PySimpleGUI will be inside the event loop.  Usually communicating with a GUI subsystem is through something like a queue.   \nUse a timeout values on your window.Read(timeout=100) call so that it doesn't completely block.  This will enable it to read the queue or make a function call or do whatever it has to do to get the data.","Q_Score":1,"Tags":"python,flask,pysimplegui","A_Id":57047683,"CreationDate":"2019-07-15T07:36:00.000","Title":"How to receive data in a PySimpleGUI GUI?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have to set up the API part of an application. \nTo summarize, there is a private oauth provider, a front-end angular app, and a django rest framework resource API. \nThe Angular app is unaccessible if not logged, and redirect to the oauth provider. The user have to login there and is redirected to the front-end. \nSo far so good, the provider give the front-end a JWT access token. \nThen the front ask for resources to the DRF API providing the JWT. \nThat's where I'm stuck, all the tutorials I find on google explain how to create your own provider. \nBut I just want to get the token, check with the oauth provider that it's valid, login the user, provide the resources, and then logout the user until the next request.\nIf someone can give me some usefull tuto\/doc\/library? \nThanks.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":160,"Q_Id":57040718,"Users Score":1,"Answer":"So, I ended up creating my own custom authentication class extending BaseAuthentication (and custom user, user manager, ...) as I did not found any existing library. \nIf someone in interested in details, you can check the DRF documentation and many resources on the internet.\nP.S. don't forget to extend authenticate_header is you want to return 401 with \"raise AuthenticationFailed\" and not 403 (for some reason).","Q_Score":0,"Tags":"python,django-rest-framework,jwt,single-sign-on","A_Id":57160148,"CreationDate":"2019-07-15T13:23:00.000","Title":"How to create a JWT DRF consumer, with external provider?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have tried automating Facebook login using Selenium WebDriver. Can I do the same automatic login on Android applications instead of web pages? And if yes, what dependency do I need? Or do I need some sort of API?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":82,"Q_Id":57042809,"Users Score":0,"Answer":"the answer is no selenium dosen't supp mobile app but you can use Appium a good free open source tool.","Q_Score":0,"Tags":"python,python-3.x,python-2.7,selenium,selenium-webdriver","A_Id":57042967,"CreationDate":"2019-07-15T15:23:00.000","Title":"Selenium automatic login can be used on web pages; can it also be used on Android apps?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have tried automating Facebook login using Selenium WebDriver. Can I do the same automatic login on Android applications instead of web pages? And if yes, what dependency do I need? Or do I need some sort of API?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":82,"Q_Id":57042809,"Users Score":0,"Answer":"One option how I do it is to run the android app in an emulator such as Android Studio on Windows, and then use a Windows automation tool like AppRobotic Personal to simulate user actions, allowing me to log in on the android app.","Q_Score":0,"Tags":"python,python-3.x,python-2.7,selenium,selenium-webdriver","A_Id":57043197,"CreationDate":"2019-07-15T15:23:00.000","Title":"Selenium automatic login can be used on web pages; can it also be used on Android apps?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to write an importer for populating admin model fields with existing model data:\nThis is my approach:\nI modified the admin view for the specific model and added a form including select boxes to choose the existing model and a button to start the import.\nAs I'm using drf for many other stuff I wrote an endpoint which delivers the model data via get request.\nWhen clicking the button some javascript logic is populating the fields with the given data.\nFor inline models I'm simulating a 'click' to add the necessary rows before filling the fields.\nThis is working as expected. But after clicking the save button, the classic error \n\nplease correct the errors below \n\nappears.\nAfter implementing some logging, I could figure out the actual error message which is related to the the inline model fields.\n\nThe inline value did not match the parent instance.\n\nIs django doing some other \"magic\" I'm missing when filling the inline admin fields?\nThanks in advance","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":165,"Q_Id":57046524,"Users Score":0,"Answer":"OK I solved the problem.\nI accidently set the primary keys (hidden fields) when populating the inline forms with javascript.","Q_Score":0,"Tags":"javascript,python,django","A_Id":57062446,"CreationDate":"2019-07-15T20:08:00.000","Title":"Populating django inline admin fields with javascript","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In my Flask application, I have one html file that holds some html and some js that semantically belongs together and cannot be used separately in a sensible way. I include this file in 2 of my html templates by using Jinja's {%include ... %}.\nNow my first approach was to put this file in my templates folder. However, I never call render_template on this file, so it seems unapt to store it in that directory. \nAnother approach would be to put it into the static folder, since its content is indeed static. But then I don't know how to tell Jinja to look for it in a different directory, since all the files using Jinja are in the templates folder.\nIs there a way to accomplish this with Jinja, or is there a better approach altogether?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":216,"Q_Id":57057614,"Users Score":1,"Answer":"You're over-thinking this. If it's included by Jinja, then it's a template file and belongs in the templates directory.","Q_Score":1,"Tags":"python,html,flask,jinja2","A_Id":57057757,"CreationDate":"2019-07-16T12:46:00.000","Title":"Flask non-template HTML files included by Jinja","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a python script that is called from a java program \nThe java program feeds data to the python script sys.stdin and the java program receives data from the python process outputstream . \nWhat is know is this .\nrunning the command  'python script.py' from the java program on 10MB of data takes about 35 seconds.\nHowever running the commands  'python script.py > temp.data ' and then  cat temp.data  is  significantly faster. \nThe order of magnitude of performance is even more drastic as the data gets larger.\nIn order to address this , I am thinking maybe there is a way to change the sys.stdout to mimic what I am doing.\nOr maybe I can pipe the python script output to a virtual file .\nAny recommendations ?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":169,"Q_Id":57067260,"Users Score":0,"Answer":"This is probably a buffering problem when you have the Java program writing to one filehandle and reading from another filehandle. The order of those in the Java and the size of the writes is suboptimal and it's slowing itself down.\nI would try \"python -u script.py\" to see what it does when you ask python to unbuffer, which should be slower but might trick your calling program into racing a different way, perhaps faster.\nThe larger fix, I think, is to batch your code, as you are testing with, and read the resulting file, or to use posix select() or filehandle events to handle how your java times its writes and reads.","Q_Score":0,"Tags":"python,bash,sys","A_Id":57068701,"CreationDate":"2019-07-17T01:13:00.000","Title":"receiving data from java program that calls python script is too slow","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Using Red Hat, apache 2.4.6, worker mpm, mod_wsgi 4.6.5, and Python 3.7 When I start httpd I get the above error and: \nModuleNotFoundError: No module named 'encodings'\nIn the httpd error_log.\nI'm using a python virtual environment created from a python installed from source under my home directory. I installed mod_wsgi from source using --with-python= option pointing to the python binary in my virtual environment, then I copied the mod_wsgi.so file into my apache modules directory as mod_wsgi37.so\nI ran ldd on this file, and have a .conf file loading it into httpd like this:\nLoadFile \/home\/myUser\/pythonbuild\/lib\/libpython3.7m.so.1.0\n LoadModule wsgi_module modules\/mod_wsgi37.so\nThen within my VirtualHost I have:\nWSGIDaemonProcess wsgi group=www threads=12 processes=2 python-path=\/var\/\n    www\/wsgi-scripts python-home=\/var\/www\/wsgi-scripts\/wsgi_env3\nWSGIProcessGroup wsgi\nWSGIScriptAlias \/test \/var\/www\/wsgi-scripts\/test.py\n\nfrom my virtual environment:\nsys.prefix:'\/var\/www\/wsgi-scripts\/wsgi_env3'\nsys.real_prefix:'\/home\/myUser\/pythonbuild'\nWhen I switch to the system-installed mod_wsgi\/python combo (remove python-home line from WSGIDaemonProcess, and change the .conf file to load the original mod_wsgi.so) it works fine. It seems like some path variables aren't getting set properly. Is there another way to set variables like PYTHONHOME that I'm missing? How can I fix my install?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":2265,"Q_Id":57082540,"Users Score":1,"Answer":"I had a very similar issue and I found that my manually specified LoadModule wsgi_module \"\/path_to_conda\/\" was being ignored because the previously apache-wide wsgi mod was being loaded. You can check if wsgi.* is present in \/etc\/apache2\/mods-enabled.\nIf that is the case, consider a2dismod wsgi to disable the apache wsgi that loads the wrong python.","Q_Score":2,"Tags":"python,apache,redhat,wsgi","A_Id":68673425,"CreationDate":"2019-07-17T18:56:00.000","Title":"mod_wsgi - Fatal Python error: initfsencoding: unable to load the file system codec","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have all my virtual environments in ~\/.virtualevs. I am working with a python \/ flask project that wants to have [PROJECT_HOME]\/venv be the virtual environment. \nAm I at risk of things breaking and unexpected results if I ln -s ~\/.virtualenvs\/my_env [PROJECT_HOME]\/venv? Or will that just work as expected?\nI've set this up and it works. For now. But feels 'klugey'","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":62,"Q_Id":57102584,"Users Score":0,"Answer":"ln -s creates a soft link (or symbolic link), think of it like a shortcut on Windows, so it's as much safe as you would do operation in the target directory itself.\nAfter creating the symlink, when someone accesses the [PROJECT_HOME]\/venv link, they will be acessing ~\/.virtualenvs\/my_env directory (transparently done by the kernel). So all operations will be happening on the target directory (~\/.virtualenvs\/my_env) as you can imagine.\nAlso check man ln to get more idea on links.\n\nBut using a symlink would break imports as Python does not check for symlinks then. So unless you've set up PYTHONPATH or sys.path correctly to include the symlink directory as well, things would break as far as import machinery is concerned.\nBut as it's a virtualenv directory, I think it's safe.","Q_Score":0,"Tags":"python,unix,virtualenv,ln","A_Id":57102732,"CreationDate":"2019-07-18T21:02:00.000","Title":"Are there risks \/ pitfalls with using ln -s to link a virtualenv into a local venv within a project directory structure?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to download files from a website using python requests module and beautifulsoup4 but the problem is that you have to wait for 5 seconds before the download button appears.\nI tried using requests.get('URL') to get the page and then parse it with beautifulsoup4 to get the download link but the problem is that you have to wait 5 seconds (if you were to open it with an actual browser) in order for the button to appear so when I pass the URL to requests.get() the initial response object doesn't have the button element I searched a lot on google but couldn't find any results that helped me.\nIs there a way to \"refresh\" the response object? or \"wait\"? that is to update it's contents after five seconds as if it were opened with a browser?\nI don't think this is possible with the requests module. What should I do?\nI'm running Windows10 64x \nI'm new so sorry if the formatting is bad. :(","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1237,"Q_Id":57108768,"Users Score":0,"Answer":"HTTP is stateless, every new request goes as a different request to the earlier one. We typically imeplement states in cookies, browser stoarges and so on. Being a plain HTTP client, there is no way for requests to refresh a request, and the next request will be a compleletly new request.\nWhat you're looking for is some client that understands JavaScript and can handle page update automatically. I suggest you to look at selenium which can do browser automation.","Q_Score":1,"Tags":"python,html,python-requests","A_Id":57108853,"CreationDate":"2019-07-19T08:46:00.000","Title":"Is there a way to \"refresh\" a request?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to build an OCR desktop application using Java and, to do this, I have to use libraries and functions that were created using the Python programming language, so I want to figure out: how can I use those libraries inside my Java application?\nI have already seen Jython, but it is only useful for cases when you want to run Java code in Python; what I want is the other way around (using Python code in Java applications).","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":137,"Q_Id":57127836,"Users Score":1,"Answer":"I have worked in projects where Python was used for ML (machine learning) tasks and everything else was written in Java.\nWe separated the execution environments entirely. Instead of mixing Python and Java in some esoteric way, you create independent services (one for Python, one for Java), and then handle inter-process communication via HTTP or messaging or some other mechanism. \"Mircoservices\" if you will.","Q_Score":0,"Tags":"java,python,javafx","A_Id":57128018,"CreationDate":"2019-07-20T19:16:00.000","Title":"Using Python Libraries or Codes in My Java Application","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to tweet something by talking to Alexa. I want to put my code on AWS Lambda, and trigger the function by Alexa.\nI already have a Python code that can tweet certain string successfully. And I also managed to create a zip file and deploy it on Lambda (code depends on the \"tweepy\" package). However, I could not get to trigger the function by Alexa, I understand that I need to use handlers and ASK-SDK (Alexa Service Kit), but I am kind of lost at this stage. Could anyone please give me an idea about how the handlers work and help me see the big picture?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":195,"Q_Id":57134770,"Users Score":0,"Answer":"For your question about capturing user's input for tweeting, use AMAZON.SearchQuery slot type.  You may run into limitations about how much text can be collected and the quality of the capture but SearchQuery slot is the place to start.","Q_Score":0,"Tags":"python,handler,alexa,alexa-skills-kit","A_Id":57210572,"CreationDate":"2019-07-21T15:53:00.000","Title":"How to integrate Lambda, Alexa, and my code (Python - Tweepy)?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Hello I am creating a spotfire dashboard which I would like to be reusable for each year.\nCurrently my layout is designed as a page with 8 buttons containing the names of stores, if clicked on, spotfire applies a filter so that only informations relating to that store shows. (these were individually created manually)\nIs there a way to automate this with JS or Iron Python, so that for each store a button is automatically created, and in action control for each button is to apply that stores filter?\nI have looked around but cannot find anything relating to dynamically creating buttons. Not asking for you to code this for me, but if someone can point me towards some resources or general logic on how this could be done it would be much appreciated.","AnswerCount":3,"Available Count":3,"Score":0.0665680765,"is_accepted":false,"ViewCount":327,"Q_Id":57137631,"Users Score":1,"Answer":"Why not just putting a textarea on your page? Inside this textarea, you add a filter control that filters data the way you want ;)\nWith this you don't have problem with elements to create dynamically, because it's impossible to create spotfirecontrols dynamically.","Q_Score":1,"Tags":"javascript,ironpython,spotfire","A_Id":57162196,"CreationDate":"2019-07-21T23:11:00.000","Title":"Spotfire - Dynamically creating buttons using","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Hello I am creating a spotfire dashboard which I would like to be reusable for each year.\nCurrently my layout is designed as a page with 8 buttons containing the names of stores, if clicked on, spotfire applies a filter so that only informations relating to that store shows. (these were individually created manually)\nIs there a way to automate this with JS or Iron Python, so that for each store a button is automatically created, and in action control for each button is to apply that stores filter?\nI have looked around but cannot find anything relating to dynamically creating buttons. Not asking for you to code this for me, but if someone can point me towards some resources or general logic on how this could be done it would be much appreciated.","AnswerCount":3,"Available Count":3,"Score":0.0665680765,"is_accepted":false,"ViewCount":327,"Q_Id":57137631,"Users Score":1,"Answer":"Think txemsukr is right.  This is not possible.  To do it with JS or IP, the API would have to exist.  Several of the elements you mentioned (action controls), you can't control with the API.","Q_Score":1,"Tags":"javascript,ironpython,spotfire","A_Id":57171287,"CreationDate":"2019-07-21T23:11:00.000","Title":"Spotfire - Dynamically creating buttons using","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Hello I am creating a spotfire dashboard which I would like to be reusable for each year.\nCurrently my layout is designed as a page with 8 buttons containing the names of stores, if clicked on, spotfire applies a filter so that only informations relating to that store shows. (these were individually created manually)\nIs there a way to automate this with JS or Iron Python, so that for each store a button is automatically created, and in action control for each button is to apply that stores filter?\nI have looked around but cannot find anything relating to dynamically creating buttons. Not asking for you to code this for me, but if someone can point me towards some resources or general logic on how this could be done it would be much appreciated.","AnswerCount":3,"Available Count":3,"Score":0.1325487884,"is_accepted":false,"ViewCount":327,"Q_Id":57137631,"Users Score":2,"Answer":"instead of buttons, why not a dropdown populated by the unique values in the \"store names\" column to set a document property, and have your data listing limit the data to [store_name] = ${store_name}","Q_Score":1,"Tags":"javascript,ironpython,spotfire","A_Id":57333250,"CreationDate":"2019-07-21T23:11:00.000","Title":"Spotfire - Dynamically creating buttons using","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In the process of discovering devices via Alexa, I'd like to create and pre populate groups with devices. The devices being discovered have data pertaining to which room\/group they belong to, so it would only seem natural to group these during discovery. \nIs this something that's possible? I haven't found anything in their documentation to suggest that it is","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":80,"Q_Id":57157766,"Users Score":0,"Answer":"Unfortunately you can't tell Alexa about groups in your discovery response.","Q_Score":3,"Tags":"python,node.js,alexa","A_Id":57160456,"CreationDate":"2019-07-23T06:18:00.000","Title":"Is there a way to create an Alexa smart home group and pre-populate it based on discovered devices, programatically?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a Char field in a form in Odoo-12. Is it possible to trigger\na method with the fields value as parameter when the Enter key is pressed without writing a Javascript widget for that?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":490,"Q_Id":57161913,"Users Score":0,"Answer":"You can write onchange method in it to trigger it and in that you can also get the values of that field.","Q_Score":0,"Tags":"javascript,python,odoo-12","A_Id":57163062,"CreationDate":"2019-07-23T10:20:00.000","Title":"Odoo-12 trigger function on \"Enter\" keypress in char field","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Lambda function in Python 3.7 which gets invoked explicitly and synchronously via Boto3. It is configured with a timeout of 5 minutes. While the 1st invocation is in progress for a minute, a second invocation is started with another request ID. Another minute later, the request is again retried, and this time it finished quicky. as it detects the system state has changed. An example sequence of invocations\n\n11:20:29 to 11:21:53 - log stream A - Req. ID: 68cfbd89-9f4c-4e8c-9de0-b9e548983692\n11:21:30 to 11:22:56 - log stream B - Req. ID: 1b569ffb-67b8-4e82-8e99-46424f45e2e5\n11:22:30 to 11:22:33 - log stream A - Req. ID: d9d60271-4626-43ab-bb3a-f14be057af13\n\nThe request ID that's returned from my Lambda call is d9d60271-4626-43ab-bb3a-f14be057af13.\nThe stack that invokes the Lambda is as follows:\n\nJenkins running a Pipeline script.\nThe script runs a Makefile which executes 2 sequential tasks.\n\n\nBuild a docker container\nRun a script inside the container.\n\nThe script that runs inside the container is in Python 3.7. It uses Boto3 to call some AWS APIs, then invokes the lambda with InvocationType=\"RequestResponse\".\n\nNone of the invocations exits with an unhandled exception or any obvious error. Is Lambda retrying my calls? Could any other element of this stack, notably Jenkins, be \"transparently\" retrying the task, and if so, how would I establish that?","AnswerCount":2,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":630,"Q_Id":57165547,"Users Score":6,"Answer":"This generally occurs due to cli time read out, which returns in multiple invocations of the lambda. Add --cli-read-timeout parameter to \naws lambda invoke\nor if using boto then follow as answered by YitzikC above\nFor aws cli the command would look like this\naws lambda invoke --function-name <fn name> --cli-read-timeout 900 --log-type Tail --region <region> \/dev\/stdout\nEnsure that the cli read timeout is equal to or greater than your lambda fun execution timeout","Q_Score":3,"Tags":"python,jenkins,aws-lambda,boto3","A_Id":57169406,"CreationDate":"2019-07-23T13:43:00.000","Title":"Amazon Lambda re-invoked every minute with multiple request IDs despite having no errors","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a problem because I'm new guy in Odoo 11, my task is combine 2 pivot ( Sales and Pos Order ) into 1 pivot view of new Module that i create. So how can i do this? step by step, because I'm just new guy. Please help me, thanks in advance","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":99,"Q_Id":57175408,"Users Score":0,"Answer":"You Can use select queries for both the models and there is no need for same field or relation you can just use Union All.For Example\nselect pos_order as po\nLEFT JOIN pos_order_line pol ON(pol.order_id = po.id)\nUNION ALL\nselect sale_order so\nLEFT JOIN sale_order_line sol ON(sol.order_id = so.id)\nHope this will help you in this regard and don't forget to define the fields you want to show on the pivot view.","Q_Score":0,"Tags":"pivot,report,python-3.6,odoo-11","A_Id":72230974,"CreationDate":"2019-07-24T04:43:00.000","Title":"How can I combine 2 pivot ( Sale and Pos Order ) into 1 pivot view on my new module?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created a Django app which uses Django's builtin authentification system which works normally till I deploy it in a production environment. \nI now got this error whenever I try to login or register a user:\n\nProgrammingError at \/login\nrelation \"auth_user\" does not exist\nLINE 1: ...user\".\"is_active\", \"auth_user\".\"date_joined\" FROM \"auth_user...\nAll other aspects of my web app work correctly and so I'm unsure what to do.","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":50,"Q_Id":57180112,"Users Score":1,"Answer":"You'll need to run python migrate [appName] in production to create the necessary tables.","Q_Score":0,"Tags":"python,django","A_Id":57180160,"CreationDate":"2019-07-24T09:54:00.000","Title":"Unable to use Django Authentication System in Deployment","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created a Django app which uses Django's builtin authentification system which works normally till I deploy it in a production environment. \nI now got this error whenever I try to login or register a user:\n\nProgrammingError at \/login\nrelation \"auth_user\" does not exist\nLINE 1: ...user\".\"is_active\", \"auth_user\".\"date_joined\" FROM \"auth_user...\nAll other aspects of my web app work correctly and so I'm unsure what to do.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":50,"Q_Id":57180112,"Users Score":0,"Answer":"use both\npython manage.py makemigrations\npython manage.py migrate,\nand checkout in database django_session should be there, if not delete migrations file in migrations folder and do above 2 steps again.","Q_Score":0,"Tags":"python,django","A_Id":57182355,"CreationDate":"2019-07-24T09:54:00.000","Title":"Unable to use Django Authentication System in Deployment","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using spotfire and ironpython.\nI've created a calculated value  (dynamic item) to know max date that match a condition in my data. \nI also have a ironpython script to do some things and part of this script must use the date from the calculated value.\nI'm trying to have python code to get the information from calculated value, but I'm struggling with it. \nI couldn't do it \"directly\", so, now, I'm trying a work around... To create a document property to receive the calculated value  and use this document property as enter parameter in the script, but I couldn't find a way to use calculated value as source of information of property document. \nSo... Is there a way to use calculated value inside ironpython script (directly or linking its value to a document property and using this document property as script parameter)?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":2257,"Q_Id":57183734,"Users Score":1,"Answer":"You are headed down the right path.  You have to pass it to a document property.  You can't use the calculated value.","Q_Score":1,"Tags":"ironpython,spotfire","A_Id":57208563,"CreationDate":"2019-07-24T13:08:00.000","Title":"Spotfire: How to use calculated value (dynamic item) in ironpython script?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to transfer an image saved to a raspberry pi from the rpi to an android application to display it. I am treating the raspberry pi as the server and the android app as the client. My server side is implemented using python. I am using pylab to save a figure to the raspberry pi and then later open the image and read the contents as a byte array. This byte array is then passed to the android app, written in java. \nI can view the image on the rpi when I open it, but once it is sent to the android, something is happening to it that causes the incorrect number of bytes to be read and the image to be corrupted. I realized that java reads big endian while the raspberry pi byte order is little endian. I am not sure if this is what is causing the problem in transferring the image? \nSo, I am wondering if there is a way to either encode the byte array as big endian when it is sent from python or a way to decode the byte array as little endian when it is received by java. I tried simply reversing the image byte array in python but that did not work. Any suggestions would be very helpful!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":448,"Q_Id":57197445,"Users Score":0,"Answer":"I am not an expert in hardware differences between a Pi and other platforms, but this process can be performed using ByteBuffer.\nYou can get an instance of ByteBuffer using ByteBuffer.wrap(byteArray) or ByteBuffer.allocate(capacity).\nYou can then set the endian-ness of the buffer using buffer.order(ByteOrder.BIG_ENDIAN); or buffer.order(ByteOrder.LITTLE_ENDIAN);\nThe data can then be returned with buffer.get().","Q_Score":0,"Tags":"java,python,tcp,raspberry-pi,endianness","A_Id":57197538,"CreationDate":"2019-07-25T08:24:00.000","Title":"Convert Image from Little to Big Endian","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm new here and I'm not at a high programming level...\nI have a problem with the developing of a web application using flask and html. In the same html page I have some input boxes (that will be compiled by a user) and their content would be inserted inside a select that initially is empty. In addition I have no submit button and I could not insert it in my app because of the will of my boss. Is there a way to do this?\nI've tried searching through the web for hours, but still nothing... Is there someone that could help me?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":26,"Q_Id":57204382,"Users Score":0,"Answer":"Add onblur function to input box and write function to insert their content. You can use onfocusout function also.","Q_Score":0,"Tags":"python,html,http,flask,web-applications","A_Id":57204912,"CreationDate":"2019-07-25T14:28:00.000","Title":"Inputs inside multiple forms with no submit button need to be displayed","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"The form that I need to do is for the user to select a payment type.The problem is that depending on the choice if the user wants to pay monthly or annually a different date-picker field has to appear. if he selects monthly, he has to choose a day of the month. And if he chooses annually a date-picker that allows him to pick the month has to appear.\nI've been searching online for an answer but all I can find is dynamic form in the sense that it can generate a field type multiples times and that is not what I need.\nAll help is appreciated.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":23,"Q_Id":57204696,"Users Score":0,"Answer":"The way I'd approach this is to have optional fields for both the month and year pickers, but use Javascript to hide the one you don't want the user to see based on the value in the payment type. Then, in the clean method of the form, I'd validate that correct field was filled in (maybe raise a ValidationError if the both were filled?).\nAlternatively, depending on what you're actually storing as a result from the datepicker (just the year or month?) maybe it'd be simpler to just dynamically update the datepicker's configuration based on the payment type field's value.\nIt's a little tricky to give you more specific suggestions without having more information about how you've setup your code.","Q_Score":0,"Tags":"python,django,django-forms","A_Id":57204931,"CreationDate":"2019-07-25T14:44:00.000","Title":"I need to do a form that changes on-the-fly depending of a choice","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"A project I recently joined, for various reasons, decided not to use Django migration system and uses our own system (which is similar enough to Django's that we could possibly automate translations)\nPrimary Question\nIs it possible to start using Django's migration system now?\nMore Granular Question(s)\nIdeally, we'd like to find some way of saying \"all our tables and models are in-sync (i.e. there is no need to create and apply any migrations), Django does not need to produce any migrations for any existing model, only for changes we make.\n\n\nIs it possible to do this?\n\nIs it simply a case of \"create the django migration table, generate migrations (necessary?), and manually update the migration table to say that they've all been ran\"?\n\nWhere can I find more information for how to go about doing this? Are there any examples of people doing this in the past?\n\n\nRegarding SO Question Rules\nI didn't stop to think for very long about whether or not this is an \"acceptable\" question to ask on SO. I assume that it isn't due to the nature of the question not having a clear, objective set of criteria for a correct answer. however, I think that this problem is surely common enough, that it could provide an extremely valuable resource for anyone in my shoes in the future. Please consider this before voting to remove.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":143,"Q_Id":57209118,"Users Score":1,"Answer":"I think you should probably be able to do manage.py makemigrations (you might need to use each app name the first time) which will create the migrations files.  You should then be able to do manage.py migrate --fake which will mimic the migration run without actually impacting your tables.  \nFrom then on (for future changes), you would run makemigrations and migrate as normal.","Q_Score":0,"Tags":"python,django,django-models,orm,django-migrations","A_Id":57209384,"CreationDate":"2019-07-25T19:40:00.000","Title":"Is it possible to start using Django's migration system after years of not using it?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a table I need to add columns to it, one of them is a column that dictates business logic. So think of it as a \"priority\" column, and it has to be unique and a integer field. It cannot be the primary key but it is unique for business logic purposes.\nI've searched the docs but I can't find a way to add the column and add default (say starting from 1) values and auto increment them without setting this as a primarykey..\nThus creating the field like\n\nexample_column =  IntegerField(null=False, db_column='PriorityQueue',default=1)\n\nThis will fail because of the unique constraint. I should also mention this is happening when I'm migrating the table (existing data will all receive a value of '1')\nSo, is it possible to do the above somehow and get the column to auto increment?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":252,"Q_Id":57209258,"Users Score":1,"Answer":"It should definitely be possible, especially outside of peewee. You can definitely make a counter that starts at 1 and increments to the stop and at the interval of your choice with range(). You can then write each incremented variable to the desired field in each row as you iterate through.","Q_Score":1,"Tags":"python,python-3.x,peewee","A_Id":57209625,"CreationDate":"2019-07-25T19:50:00.000","Title":"Peewee incrementing an integer field without the use of primary key during migration","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a table I need to add columns to it, one of them is a column that dictates business logic. So think of it as a \"priority\" column, and it has to be unique and a integer field. It cannot be the primary key but it is unique for business logic purposes.\nI've searched the docs but I can't find a way to add the column and add default (say starting from 1) values and auto increment them without setting this as a primarykey..\nThus creating the field like\n\nexample_column =  IntegerField(null=False, db_column='PriorityQueue',default=1)\n\nThis will fail because of the unique constraint. I should also mention this is happening when I'm migrating the table (existing data will all receive a value of '1')\nSo, is it possible to do the above somehow and get the column to auto increment?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":252,"Q_Id":57209258,"Users Score":0,"Answer":"Depends on your database, but postgres uses sequences to handle this kind of thing. Peewee fields accept a sequence name as an initialization parameter, so you could pass it in that manner.","Q_Score":1,"Tags":"python,python-3.x,peewee","A_Id":57210489,"CreationDate":"2019-07-25T19:50:00.000","Title":"Peewee incrementing an integer field without the use of primary key during migration","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Every once in a while, the temp folder on my deployment server seems to go missing. I am using Flask and Newspaper on AWS elastic beanstalk. I am using the Newspaper library to scrape meta tags from external urls.\nError on the server:\n{'code_content': 500, 'error': \"[Errno 2] No such file or directory: '\/tmp\/.newspaper_scraper\/article_resources'\"}\nEverything works fine after the server is restared. Is there a config setting that might fix this?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":163,"Q_Id":57212589,"Users Score":2,"Answer":"We've had a similar problem using AWS Elastic Beanstalk platform \"Java 8 running on 64bit Amazon Linux\". There was a daily cron-job (\/etc\/cron.daily\/tmpwatch) running that deletes all files in the \/tmp folder that are older than 10 days.\nTry placing the .newspaper_scraper folder somewhere else.","Q_Score":1,"Tags":"flask,amazon-elastic-beanstalk,python-newspaper","A_Id":65408641,"CreationDate":"2019-07-26T03:00:00.000","Title":"Missing temp folder in elastic beanstack with newspaper library","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a list of url and many of them are invalid. When I use scrapy to crawl, the engine will automatically filter those urls with 404 status code, but some urls' status code aren't 404 and will be crawled so when I open it, it says something like there's nothing here or the domain has been changed, etc. Can someone let me know how to filter these types of invalid urls?","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1284,"Q_Id":57216139,"Users Score":0,"Answer":"In your callback (e.g. parse) implement checks that detect those cases of 200 responses that are not valid, and exit the callback right away (return) when you detect one of those requests.","Q_Score":0,"Tags":"python,scrapy,web-crawler","A_Id":57308027,"CreationDate":"2019-07-26T08:32:00.000","Title":"How to check if a url is valid in Scrapy?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I tried to connect it with SVN in aws ec2. It is showing Network timeout. After that i tried scp to transfer again it is showing the same error connection refused.  Then i tried AWS S3 ec2 copy command to copy the file from local machine to S3 bucket but again it is showing the same error.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":13,"Q_Id":57218711,"Users Score":0,"Answer":"The approach which I use to move code or files from local server to ec2 instance is git.\nIt maintains my file changes with proper commit messages as well as a proper set of revisions or iterations I have done until now.","Q_Score":0,"Tags":"python-3.x","A_Id":57218757,"CreationDate":"2019-07-26T11:01:00.000","Title":"AWS to local machine file sharing","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to parse a page, keeping HTML and JS the same as in my own browser. Site must think, that I am logged using the same browser, I need to \"press\" some buttons using JS and find some elements.\nWhen using requests library or selenium.webdriver.Firefox(), site think I am from a new browser. But I think selenium must help.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":112,"Q_Id":57232605,"Users Score":0,"Answer":"Requests cannot process JavaScript, nor can it parse HTML and CSS to create a DOM. Requests is just a very nice abstraction around making HTTP requests to any server, but websites\/browsers aren't the only things that use HTTP.\nWhat you're looking for is a JavaScript engine along with an HTML and CSS parser so that it can create an actual DOM for the site and allow you to interact with it. Without these things, there'd be no way to tell what the DOM of the page would be, and so you wouldn't be able to click buttons on it and have the resulting JavaScript do what it should. \nSo what you're looking for is a web browser. There's just no way around it. Anything that does those things, is, by definition, a web browser. \nTo clarify from one of your comments, just because something has a GUI, that doesn't mean it isn't automatic. In fact, that's exactly what Selenium is for (i.e. automating the interactions with the GUI that is the web page). It's not meant to emulate user behavior exactly 1:1, and it's actually an abstraction around the WebDriver protocol, which is meant for writing automated tests. However, it does allow you to interact with the webpage in a way that approximates how a user would interact with it.\nYou may not want to see the GUI of the browser, but luckily, Chrome and Firefox have \"headless\" modes, and Selenium can control headless instances of those browsers. This would have the browser GUI be hidden while Selenium controls it, which sounds like what you're looking for.","Q_Score":0,"Tags":"python,selenium,parsing,web,browser","A_Id":57240490,"CreationDate":"2019-07-27T13:30:00.000","Title":"Navigate webpage as if from my browser (Python, selenium)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Settings.py DEBUG=True\nBut the django web application shows Server Error 500.\nI need to see the error pages to debug what is wrong on the production server. \nThe web application works fine in development server offline.\nThe google logs does not show detail errors. Only shows the http code of the request.","AnswerCount":4,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":409,"Q_Id":57234950,"Users Score":0,"Answer":"Thank you all for replying to my question. The project had prod.py (production settings file, DEBUG=False) and a dev.py (development settings file). When python manage.py is called it directly calls dev.py(DEBUG=True). However, when I push to google app engine main.py is used to specify how to run the application. main.py calls wsgi.py which calls prod.pd (DEBUG=False). This is why the django error pages were not showing. I really appreciate you all. VictorTorres, Mahirq9 and ParthS007","Q_Score":0,"Tags":"python,django,google-compute-engine","A_Id":57312444,"CreationDate":"2019-07-27T18:25:00.000","Title":"Unable to view django error pages on Google Cloud web app","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I create some django websites using Plesk Onyx. My problem is If I go to domainname.com\/appname\/settings.py or domainname.com\/manage.py url i see everything in \".py\" file. My folder permissions 755, file permissions is 644. The problem is solved when I set the file permissions to 640 or 600. Is there a shortcut in django related to this vulnerability? or do I need to change individual file permissions? I'm looking for an easy way. I don't know, maybe by adding a little code in django I can prevent these files from appearing. Im using python 3.6 - Django 2.2.3 - Plesk Onyx - Nginx","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":175,"Q_Id":57236028,"Users Score":1,"Answer":"in ur .htaccess file block directory browsing\n\nif want block specific extention\nIndexIgnore *.py *.txt\nblock full directory listing\nOptions -Indexes","Q_Score":0,"Tags":"python,django,apache,security,plesk","A_Id":57236467,"CreationDate":"2019-07-27T20:59:00.000","Title":"Plesk Django .py files showing in browser. How do I make it safe?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I know this has been questioned before, but no real solution was proposed and I was wondering if there any new ways nowadays.\nIs there anyway to hook an event using any AWS service to check if a lambda has timed out? I mean it logs into the CloudWatch logs that it timed out so there must be a way.\nSpecifically in Python because its not so simple to keep checking if its reaching the 20 minute mark as you can with Javascript and other naturally concurrent languages.\nIdeally I want to execute a lambda if the python lambda times out, with the same payload the original one received.","AnswerCount":4,"Available Count":1,"Score":0.049958375,"is_accepted":false,"ViewCount":5966,"Q_Id":57258980,"Users Score":1,"Answer":"Two options I can think of, the first is quick and dirty, but also less ideal:\n\nrun it in a step function (check out step functions in AWS) which has the capability to retry on timeouts\/errors\na better way would be to re-architect your code to be idempotent. In this example, the process that triggers the lambda checks a condition, and as long as this condition is true, trigger the lambda. That condition needs to remain true unless the lambda finished executing the logic successfully. This can be obtained by persisting the parameters sent to the lambda in a table in the DB, for example, and have an extra field called \"processed\" which will be modified to \"true\" only once the lambda finished running successfully for that event.\n\nUsing method #2 will make your code more resilient, easy to re-run on errors, and also easy to monitor: basically all you have to do is check how many such records do you have which are not processed, and what's their create\/update timestamp on the DB.","Q_Score":5,"Tags":"amazon-web-services,aws-lambda,python-3.7","A_Id":57259095,"CreationDate":"2019-07-29T17:46:00.000","Title":"How to handle timeouts in a python lambda?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm very confused as to what .decompose() does in BeautifulSoup - I've read the docs. But this is just one of those docs that isn't clicking. \nI'm working on a personal project to scrape some data from website. For work we use BS4 for testing purposes. As it's been explained to me, every time we parse a page, we instantiate a HTMLParser(), which is BeautifulSoup(html, features=\"html5lib\"). Once we're done, we need to destroy() it. This destroy method is simply calling .decompose() on the BeautifulSoup object itself. \nI'm just curious as to what decompose is doing and why we need to do it.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":141,"Q_Id":57263341,"Users Score":0,"Answer":"Use .decompose() just to edit or modify your html document.\nWhen you want to remove a tag because it is not needed anymore.","Q_Score":0,"Tags":"python,html,parsing,web-scraping,beautifulsoup","A_Id":70686344,"CreationDate":"2019-07-30T01:52:00.000","Title":"decompose() in BeautifulSoup","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I would like to collect and parse stats after my scrapy crawl has finished. I know it dumps the stats but I would like to ideally have a method\/hook a method that runs when the scrape has finished which can then collect the stats (as I will use them to decide if another scrape is needed automatically).\nPlease don't suggest using some sort of external script, I want it all contained to one project please.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":39,"Q_Id":57270706,"Users Score":0,"Answer":"Try this command to save progress of spider:\nnohup scrapy crawl spider > spider_progress &\nSee only tail of the text file which contains stats of spider: \ncat spider_progress | tail","Q_Score":0,"Tags":"python,scrapy,web-crawler","A_Id":57271649,"CreationDate":"2019-07-30T11:34:00.000","Title":"Post crawl stats collection","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a model that has attribute models.DateField(db_index=True)\ni insert datetime.strptime(\"2019-07-08\", \"%Y-%m-%d\") into it. \nNow, when I get() on it I get:  datetime.date(2019, 7, 1) as opposed to datetime.datetime(2019, 7, 1, 0, 0)\nWhy is it inconsistent? :(","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":65,"Q_Id":57287038,"Users Score":0,"Answer":"You use a DateField, not a DateTimeField.\nYou need to use DateTimeField instead of DateField","Q_Score":0,"Tags":"django,python-3.x,django-models","A_Id":57287206,"CreationDate":"2019-07-31T09:04:00.000","Title":"How to fix django inconsistent date fields?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Trying to figure out how to make python play mp3s whenever a tag's text changes on an Online Fantasy Draft Board (ClickyDraft).\nI know how to scrape elements from a website with python & beautiful soup, and how to play mp3s. But how do you think can I have it detect when a certain element changes so it can play the appropriate mp3?\nI was thinking of having the program scrape the site every 0.5seconds to detect the changes,\nbut I read that that could cause problems? Is there any way of doing this?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":40,"Q_Id":57291451,"Users Score":0,"Answer":"The only way is too scrape the site on a regular basis.  0.5s is too fast. I don't know how time sensitive this project is. But scraping every 1\/5\/10 minute is good enough. If you need it quicker, just get a proxy  (plenty of free ones out there) and you can scrape the site more often.\nJust try respecting the site, Don't consume too much of the sites ressources by requesting every 0.5 seconds","Q_Score":1,"Tags":"python,html,beautifulsoup,mp3","A_Id":57292691,"CreationDate":"2019-07-31T13:05:00.000","Title":"Is it possible to write a Python web scraper that plays an mp3 whenever an element's text changes?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on Django app on branch A with appdb database in settings file. Now I need to work on another branch(B) which has some new DB changes(eg. new columns, etc). The easiest for me is to point branch B to a different DB by changing the settings.py and then apply the migrations. I did the migrations but I am getting error like 1146, Table 'appdb_b.django_site' doesn't exist. So how can I use a different DB for my branchB code without dropping database appdb?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":43,"Q_Id":57294233,"Users Score":1,"Answer":"The existing migration files have information that causes the migrate command to believe that the tables should exist and so it complains about them not existing.\nYou need to MOVE the migration files out of the migrations directory (everything except init.py) and then do a makemigrations and then migrate.","Q_Score":0,"Tags":"python,django","A_Id":57296935,"CreationDate":"2019-07-31T15:27:00.000","Title":"How to point Django app to new DB without dropping the previous DB?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to extract \"Twitter for iPhone\" part from this string.\nBut I have different values in the place of \"Twitter for iPhone\" in 1000s of columns in a dataframe. I only need the values after \">\" and before \"<\" from the following set of strings.\nI tried df.col.str.extract('(Twitter for iPhone|Twitter for Samsung|Twitter for others)') which extracts only those 'Twitter for iPhone' values but not the others and the rest are filled with NaNs.","AnswerCount":3,"Available Count":1,"Score":0.0665680765,"is_accepted":false,"ViewCount":259,"Q_Id":57297369,"Users Score":1,"Answer":"Try df.col.str.extract(pat = '(Twitter for (iPhone|Samsung|others))')","Q_Score":1,"Tags":"python,regex,pandas,dataframe","A_Id":57297560,"CreationDate":"2019-07-31T19:03:00.000","Title":"I want to extract a particular pattern from a content string: \"Twitter for iPhone\"","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have 2 web elements with the same XPath and name but under the different navigation links. Both links point to the same page but with a different title. How should I access each of the links uniquely?\nI am a beginner to python selenium programming","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":23,"Q_Id":57300618,"Users Score":0,"Answer":"You have the answer in the question itself. You must try identifying the elements using title with combination of other attributes if they have unique titles.\nPS: Please(always) add the code you have tried and the relevant(in this case HTML) required files\/snippet which can help us understand and investigate better. Questions with enough information get faster replies :)","Q_Score":0,"Tags":"python-3.x,selenium-chromedriver","A_Id":57302283,"CreationDate":"2019-08-01T01:05:00.000","Title":"Web element with same name and xpath under two elements in the navigation pane","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was learning how to play music using selenium so I wrote a program which would be used as a module to play music. Unfortunately I exited the python shell without exiting the headless browser and now the song is continuously playing.\nCould someone tell me how I can find the current headless browser and exit it?","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":84,"Q_Id":57305632,"Users Score":1,"Answer":"You need to include in your script to stop the music before closing the session of your headless browser.","Q_Score":0,"Tags":"python-3.x,selenium-webdriver","A_Id":57306386,"CreationDate":"2019-08-01T09:16:00.000","Title":"Stop music from playing in headless browser","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was learning how to play music using selenium so I wrote a program which would be used as a module to play music. Unfortunately I exited the python shell without exiting the headless browser and now the song is continuously playing.\nCould someone tell me how I can find the current headless browser and exit it?","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":84,"Q_Id":57305632,"Users Score":1,"Answer":"If you are on a Linux box, You can easily find the process Id with ps aux| grep chrome command and Kill it. If you are on Windows kill the process via Task Manager","Q_Score":0,"Tags":"python-3.x,selenium-webdriver","A_Id":57308855,"CreationDate":"2019-08-01T09:16:00.000","Title":"Stop music from playing in headless browser","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to set a manytomany relation to default django user table.Is there any way to implement it rather than using AbstractUser method of django \n(extending User Model)?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":945,"Q_Id":57306907,"Users Score":0,"Answer":"You don't need to extend the default Django User table to create a many to many relationship with it.\nAdd the many to many relation to the model you're creating, and behind the scenes Django will create a third table that stores the relationship using a ForeignKey to each object.","Q_Score":1,"Tags":"python,django,many-to-many","A_Id":57306987,"CreationDate":"2019-08-01T10:24:00.000","Title":"Django set ManytoManyField to default user model","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a periodic task scheduled to run every 10 minutes.  Sometimes this task completes in 2-3 minutes, sometimes it takes 20 minutes.\nIs there any way using celery beats to not open the task if the previous task hasn't completed yet?  I don't see an option for it in the interval settings.","AnswerCount":3,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":2134,"Q_Id":57334468,"Users Score":7,"Answer":"No, Celery Beat knows nothing about the running tasks.\nOne way to achieve what you are trying to do is to link the task to itself. async_apply() for an example has optional parameter link and link_error which can be used to provide a signature (it can be a single task too) to run if the task finishes successfully (link) or unsuccessfully (link_error).\nWhat I use is the following - I schedule task to run frequently (say every 5 minutes), and I use a distributed lock to make sure I always have only one instance of the task running.\nFinally a reminder - you can always implement your own scheduler, and use it in your beat configuration. I was thinking about doing this in the past for exactly the same thing you want, but decided that the solution I already have is good enough for me.","Q_Score":8,"Tags":"python,django,task,celery,scheduling","A_Id":57345459,"CreationDate":"2019-08-02T23:38:00.000","Title":"How to check if celery task is already running before running it again with beat?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a periodic task scheduled to run every 10 minutes.  Sometimes this task completes in 2-3 minutes, sometimes it takes 20 minutes.\nIs there any way using celery beats to not open the task if the previous task hasn't completed yet?  I don't see an option for it in the interval settings.","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":2134,"Q_Id":57334468,"Users Score":0,"Answer":"I use Celery with Django models and I implemented a boolean has_task_running at the model level. Then with Celery signals I change the state of the flag to True when signal before_task_publish is trigged and False when a task terminates. Not simple but flexible.","Q_Score":8,"Tags":"python,django,task,celery,scheduling","A_Id":72109220,"CreationDate":"2019-08-02T23:38:00.000","Title":"How to check if celery task is already running before running it again with beat?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Given a Java string and an offset into that String, what is the correct way of calculating the offset of that same location into an UTF8 string?\nMore specifically, given the offset of a valid codepoint in the Java string, how can one map that offset to a new offset of that codepoint in a Python 3 string? And vice versa?\nIs there any library method which already provides the mapping between Java String offsets and Python 3 string offsets?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":315,"Q_Id":57345598,"Users Score":0,"Answer":"No, there cannot be. UTF-16 uses a varying number of code units per codepoint and so does UTF-8. So, the indices are entirely dependent on the codepoints in the string. You have to scan the string and count. \nThere are relationships between the encodings, though. A codepoint has two UTF-16 code units if and only if it has four UTF-8 code units. So, an algorithm could tally UTF-8 code units by scanning UTF-16 codepoints: 4 four a high surrogate, 0 for a low surrogate, 3 for some range, 2 for another and 1 for another.","Q_Score":3,"Tags":"java,python-3.x,unicode,utf-8,utf-16","A_Id":57348500,"CreationDate":"2019-08-04T09:57:00.000","Title":"Java code to convert between UTF8 and UTF16 offsets (Java string offsets to\/from Python 3 string offsets)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm syncing a large amount of data and I'm getting this error back: A string literal cannot contain NUL (0x00) characters. Obviously this is a postgres problem, but I'm not quite sure how to solve it. Is there a way to strip null characters out at the Django model level? I have a large set of fields that I'm syncing.","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":9755,"Q_Id":57371164,"Users Score":2,"Answer":"Unless you definitely do want to store NUL characters, you should sanitize your text  so it does not contain them. At the model level, you'd define a clean_fieldname method to do that.\nIf you do want to store them, you need to store them in a binary-compatible field in the database. Django 1.6+ has BinaryField which should work.","Q_Score":11,"Tags":"python,django,postgresql","A_Id":57372080,"CreationDate":"2019-08-06T07:41:00.000","Title":"Django + Postgres: A string literal cannot contain NUL (0x00) characters","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm writing a migration that converts a ForeignKeyField to a ManyToManyField. Part of this migration involves data migration. Migrating forwards is easy and requires no user interaction. Migrating backwards however ideally requires the user to pick which of the m2m to become the foreign key (ie there's a recognition of data loss).\nAdditionally. the user performing the migration might want to be given a python shell so they can poke around and look at objects before answering the question.\nAnd some users might not care, and might not want to be prompted at all. (ie they use the --no-input argument during migration)\nDoes django have a built in mechanism to do all this? I can't find anything, but at the back of my mind it seems like something I've seen somewhere.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":140,"Q_Id":57372221,"Users Score":1,"Answer":"If you really need to interactively ask for user input during a migration, you can use the InteractiveMigrationQuestioner in django.db.migrations.questioner.\nSubclass it, add your own question (e.g. ask_which_instance) with its arguments. You can use the _ask_choice method to let users choose from multiple options.\nThen in your backward() method, instantiate it and call your question method (which should return the user's input, e.g. 1, 2 or 3 if you offer 3 choices).","Q_Score":0,"Tags":"python,django,migration","A_Id":57572147,"CreationDate":"2019-08-06T08:47:00.000","Title":"Django: How to prompt user during migration?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"This is the environment:\n\nAWS Aurora database compatible with MySql.\nDjango 2.0.3 (Python 3.6)\nPip-Mysql dependencies: django-mysql==2.2.2, mysqlclient==1.3.12.\nMaster-Slave database configuration.\n\nIt seems that django or mysql engine always fails on certain queries resulting in this specific error:\n\nTraceback (most recent call last):   File\n  \"\/home\/ubuntu\/ivs\/vpython\/lib\/python3.6\/site-packages\/django\/db\/models\/fields\/related_descriptors.py\",\n  line 158, in get\n      rel_obj = self.field.get_cached_value(instance)   File \"\/home\/ubuntu\/ivs\/vpython\/lib\/python3.6\/site-packages\/django\/db\/models\/fields\/mixins.py\",\n  line 13, in get_cached_value\n      return instance._state.fields_cache[cache_name] KeyError: 'assigned_to'\nDuring handling of the above exception, another exception occurred:\nTraceback (most recent call last):   File\n  \"\/home\/ubuntu\/ivs\/vpython\/lib\/python3.6\/site-packages\/django\/db\/backends\/utils.py\",\n  line 85, in _execute\n      return self.cursor.execute(sql, params)   File \"\/home\/ubuntu\/ivs\/vpython\/lib\/python3.6\/site-packages\/django\/db\/backends\/mysql\/base.py\",\n  line 71, in execute\n      return self.cursor.execute(query, args)   File \"\/home\/ubuntu\/ivs\/vpython\/lib\/python3.6\/site-packages\/MySQLdb\/cursors.py\",\n  line 253, in execute\n      self._warning_check()   File \"\/home\/ubuntu\/ivs\/vpython\/lib\/python3.6\/site-packages\/MySQLdb\/cursors.py\",\n  line 148, in _warning_check\n      warnings = db.show_warnings()   File \"\/home\/ubuntu\/ivs\/vpython\/lib\/python3.6\/site-packages\/MySQLdb\/connections.py\",\n  line 381, in show_warnings\n      self.query(\"SHOW WARNINGS\")   File \"\/home\/ubuntu\/ivs\/vpython\/lib\/python3.6\/site-packages\/MySQLdb\/connections.py\",\n  line 277, in query\n      _mysql.connection.query(self, query)\n  _mysql_exceptions.OperationalError: (2013, 'Lost connection to MySQL server during query')\n\nYes, one of my models have \"assigend_to\" field which is a foreign key. But why does it fail with a KeyError?\nDid anyone have any similar KeyErrors and MySql lost connections as a result?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":629,"Q_Id":57377238,"Users Score":0,"Answer":"Wow, what actually was happening is this:\n\nI was making queries with reverse-foreign keys.\nObjects returned with with reverse-foreign keys contained some other foreign keys.\nWhen I tried to access them e.g. 'assigned_to' i got this exception every time.","Q_Score":0,"Tags":"mysql,django,python-3.x,django-models,amazon-aurora","A_Id":57509740,"CreationDate":"2019-08-06T13:29:00.000","Title":"Django ORM key error with lost MySql connection","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have tasks that do a get request to an API.\nI have around 70 000 requests that I need to do, and I want to spread them out in 24 hours. So not all 70k requests are run at for example 10AM. \nHow would I do that in celery django? I have been searching for hours but cant find a good simple solution.\nThe database has a list of games that needs to be refreshed. Currently I have a cron that creates tasks every hour. But is it better to create a task for every game and make it repeat every hour?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":185,"Q_Id":57390985,"Users Score":0,"Answer":"The typical approach is to send them whenever you need some work done, no matter how many there are (even hundreds of thousands). The execution however is controlled by how many workers (and worker processes) you have subscribed to a dedicated queue. The key here is the dedicated queue - that is a common way of not allowing all workers start executing the newly created tasks. This goes beyond the basic Celery usage. You need to use celery multi for this use-case, or create two or more separate Celery workers manually with different queues.\nIf you do not want to over-complicate things you can use your current setup, but make these tasks with lowest priority, so if any new, more important, task gets created, it will be executed first. Problem with this approach is that only Redis and RabbitMQ backends support priorities as far as I know.","Q_Score":1,"Tags":"python,python-3.x,celery,django-celery","A_Id":57391848,"CreationDate":"2019-08-07T09:18:00.000","Title":"Spread Celery Django tasks out over 24 hours","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working with AWS Lambda functions (in Python), that process new files that appear in the same Amazon S3 bucket and folders.\nWhen new file appears in s3:\/folder1\/folderA, B, C, an event s3:ObjectCreated:* is generated and it goes into sqs1, then processed by Lambda1 (and then deleted from sqs1 after successful processing).\nI need the same event related to the same new file that appears in s3:\/folder1\/folderA (but not folderB, or C) to go also into sqs2, to be processed by Lambda2. Lambda1 modifies that file and saves it somewhere, Lambda2 gets that file into DB, for example.\nBut AWS docs says that:\n\nNotification configurations that use Filter cannot define filtering rules with overlapping prefixes, overlapping suffixes, or prefix and suffix overlapping.\n\nSo question is how to bypass this limitation? Are there any known recommended or standard solutions?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":1130,"Q_Id":57399129,"Users Score":1,"Answer":"Instead of set up the S3 object notification of (S3 -> SQS), you should set up a notification of (S3 -> Lambda).\nIn your lambda function, you parse the S3 event and then you write your own logic to send whatever content about the S3 event to whatever SQS queues you like.","Q_Score":2,"Tags":"python-3.x,amazon-web-services,amazon-s3,amazon-sqs","A_Id":57399292,"CreationDate":"2019-08-07T16:55:00.000","Title":"How to direct the same Amazon S3 events into several different SQS queues?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I would like to create a clone\/copy of an existing web application on pythonanywhere. I have access to the pythonanywhere account.  The application is active and is not mine - a friend is allowing me to make a copy so that I can learn how web applications work. Thus, it is important that I can make a copy without messing up or updating anything in the current web application. \nAll of the tutorials I am finding are about deploying an application via git to github to pythonanywhere (which I have done before) but never the other way around. \nI created an empty github repository and thought about going to the python bash console and adding it as a remote server, then pushing the code to github. But, I don't know if this makes a new connection that will mess up the application. I want to just download the application once and be done. \nI would really appreciate step-by-step instructions on how to download a copy of the web application to my local server and\/or github. If you provide code, please assume I know nothing and tell me where I should run it (command prompt, pythonanywhere bash console, etc).","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1080,"Q_Id":57401599,"Users Score":2,"Answer":"I just did this the following way. In a bash console on pythonanywhere, navigate to the app with $cd yourapp. Then create a git repository there with git init. Once its done add the folders in the app to the repo with git add . Then you need to commit to update the empty repository: git commit -m \"your comment\". \nOnce the repo is created on pythonanywhere, move to the local folder in your local machine's terminal where you want to copy the app. Then clone the repo on pythonanywhere with entering the following command to your local terminal: git clone yourusername@ssh.pythonanywhere.com:\/home\/yourusername\/yourapp \nSince its not a bare repository, you won't be able to push any code changes to the pythonanywhere app, by default. This can be changed though, but I understand that is not what you want. If you want to make sure that no changes are applied back, just delete the .git folder from pythonanywhere which was created by the git init \nMy concern though is, that if your friend's app is database backed, you might be able to send data to the live database from your local instance of the app. So, definitely double check on that with him\/her.","Q_Score":1,"Tags":"git,github,pythonanywhere","A_Id":59017818,"CreationDate":"2019-08-07T20:03:00.000","Title":"How to clone an existing web application from pythonanywhere to github\/local","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am doing a small project involving web scraping basic html pages hosted on an internal server we use at work. Upon entry to these pages a popup . . . which looks exactly like a windows.prompt() asks for username and a password with a message like \"Enter credentials for Proxy: \". Is there a way to automatically inject and submit these values on the prompt box using JavaScript or even python?\nYes I do have access but every time I go to a different page it will re-prompt me and I am trying to do this for a very large amount of pages.\nI have already tried inspecting the page but there does not seem to be any element for a popup.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":86,"Q_Id":57401627,"Users Score":1,"Answer":"I suspect you may be getting the login prompt due to the web server's setup for the page and not due to anything included in the content of the page in question. You may need to adjust your app's code to handle the login behavior (setting cookies in your request header for example).","Q_Score":0,"Tags":"javascript,python,html","A_Id":57402523,"CreationDate":"2019-08-07T20:06:00.000","Title":"How to enter in values for a window.prompt() using javascript?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"When user enter email for  password reset then error arise connection  failure which is related to server failure error .\nraceback:\nFile \"C:\\ProgramData\\Anaconda3\\lib\\site-packages\\django-2.2b1-py3.7.egg\\django\\core\\handlers\\exception.py\" in inner\n  34.             response = get_response(request)\nFile \"C:\\ProgramData\\Anaconda3\\lib\\site-packages\\django-2.2b1-py3.7.egg\\django\\core\\handlers\\base.py\" in _get_response\n  115.                 response = self.process_exception_by_middleware(e, request)\nFile \"C:\\ProgramData\\Anaconda3\\lib\\site-packages\\django-2.2b1-py3.7.egg\\django\\core\\handlers\\base.py\" in _get_response\n  113.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)\nFile \"C:\\ProgramData\\Anaconda3\\lib\\site-packages\\django-2.2b1-py3.7.egg\\django\\views\\generic\\base.py\" in view\n  71.             return self.dispatch(request, *args, **kwargs)\nFile \"C:\\ProgramData\\Anaconda3\\lib\\site-packages\\django-2.2b1-py3.7.egg\\django\\utils\\decorators.py\" in _wrapper\n  45.         return bound_method(*args, **kwargs)\nFile \"C:\\ProgramData\\Anaconda3\\lib\\site-packages\\django-2.2b1-py3.7.egg\\django\\views\\decorators\\debug.py\" in sensitive_post_parameters_wrapper\n  76.             return view(request, *args, **kwargs)\nFile \"C:\\ProgramData\\Anaconda3\\lib\\site-packages\\registration\\views.py\" in dispatch\n  53.         return super(RegistrationView, self).dispatch(request, *args, **kwargs)\nFile \"C:\\ProgramData\\Anaconda3\\lib\\site-packages\\django-2.2b1-py3.7.egg\\django\\views\\generic\\base.py\" in dispatch\n  97.         return handler(request, *args, **kwargs)\nFile \"C:\\ProgramData\\Anaconda3\\lib\\site-packages\\django-2.2b1-py3.7.egg\\django\\views\\generic\\edit.py\" in post\n  142.             return self.form_valid(form)\nFile \"C:\\ProgramData\\Anaconda3\\lib\\site-packages\\registration\\views.py\" in form_valid\n  56.         new_user = self.register(form)\nFile \"C:\\ProgramData\\Anaconda3\\lib\\site-packages\\registration\\backends\\default\\views.py\" in register\n  100.             request=self.request,\nFile \"C:\\ProgramData\\Anaconda3\\lib\\site-packages\\registration\\models.py\" in create_inactive_user\n  193.                     lambda: registration_profile.send_activation_email(\nFile \"C:\\ProgramData\\Anaconda3\\lib\\site-packages\\django-2.2b1-py3.7.egg\\django\\db\\transaction.py\" in exit\n  284.                     connection.set_autocommit(True)\nFile \"C:\\ProgramData\\Anaconda3\\lib\\site-packages\\django-2.2b1-py3.7.egg\\django\\db\\backends\\base\\base.py\" in set_autocommit\n  409.             self.run_and_clear_commit_hooks()\nFile \"C:\\ProgramData\\Anaconda3\\lib\\site-packages\\django-2.2b1-py3.7.egg\\django\\db\\backends\\base\\base.py\" in run_and_clear_commit_hooks\n  624.             func()\nFile \"C:\\ProgramData\\Anaconda3\\lib\\site-packages\\registration\\models.py\" in \n  194.                         site, request)\nFile \"C:\\ProgramData\\Anaconda3\\lib\\site-packages\\registration\\models.py\" in send_activation_email\n  451.         email_message.send()\nFile \"C:\\ProgramData\\Anaconda3\\lib\\site-packages\\django-2.2b1-py3.7.egg\\django\\core\\mail\\message.py\" in send\n  291.         return self.get_connection(fail_silently).send_messages([self])\nFile \"C:\\ProgramData\\Anaconda3\\lib\\site-packages\\django-2.2b1-py3.7.egg\\django\\core\\mail\\backends\\smtp.py\" in send_messages\n  103.             new_conn_created = self.open()\nFile \"C:\\ProgramData\\Anaconda3\\lib\\site-packages\\django-2.2b1-py3.7.egg\\django\\core\\mail\\backends\\smtp.py\" in open\n  63.             self.connection = self.connection_class(self.host, self.port, **connection_params)\nFile \"C:\\ProgramData\\Anaconda3\\lib\\smtplib.py\" in init\n  251.             (code, msg) = self.connect(host, port)\nFile \"C:\\ProgramData\\Anaconda3\\lib\\smtplib.py\" in connect\n  336.         self.sock = self._get_socket(host, port, self.timeout)\nFile \"C:\\ProgramData\\Anaconda3\\lib\\smtplib.py\" in _get_socket\n  307.                                         self.source_address)\nFile \"C:\\ProgramData\\Anaconda3\\lib\\socket.py\" in create_connection\n  727.         raise err\nFile \"C:\\ProgramData\\Anaconda3\\lib\\socket.py\" in create_connection\n  716.             sock.connect(sa)\nException Type: ConnectionRefusedError at \/accounts\/register\/\nException Value: [WinError 10061] No connection could be made because the target machine actively refused it","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2019,"Q_Id":57405472,"Users Score":0,"Answer":"Either the port you are trying to connect is wrong or the machine's firewall refuses your request.","Q_Score":2,"Tags":"python,django,sendmail,smtpclient,smtplib","A_Id":57405501,"CreationDate":"2019-08-08T05:01:00.000","Title":"ConnectionRefusedError at \/accounts\/register\/","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm needing to trigger an action at a particular date\/time either in python or by another service.\nLet's say I have built an application that stores the expiry dates of memberships in a database. I'm needing to trigger a number of actions when the member expires (for example, changing the status of the membership and sending an expiry email to the member), which is fine - I can deal with the actions. \nHowever, what I am having trouble with is how do I get these actions to trigger when the expiry date is reached? Are there any concepts or best practices that I should stick to when doing this?\nCurrently, I've achieved this by executing a Google Cloud Function every day (via Google Cloud Scheduler) which checks if the membership expiry is equal to today, and completes the action if it is. I feel like this solution is quite 'hacky'.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":60,"Q_Id":57407997,"Users Score":0,"Answer":"I'm not sure which database you are using but I'm inferring you have a table that have the \"membership\" details of all your users. And each day you run a Cron job that queries this table to see which row has \"expiration_date = today\", is that correct?. \nI believe that's an efficient way to do it (it will be faster if you have few columns on that table).","Q_Score":0,"Tags":"python,cron,google-cloud-functions,google-cloud-scheduler","A_Id":57411478,"CreationDate":"2019-08-08T08:08:00.000","Title":"Triggering actions in Python Flask via cron or similar","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Should i annotate types in my unit tests functions? \nWhat also with overridden django methods like save and get or post functions in generic view?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":351,"Q_Id":57409867,"Users Score":1,"Answer":"This is arguably an opinion question but I think that there is a generally accepted answer, which is roughly \"No\".\nOne way of categorising programming languages is into statically typed and dynamically typed. Statically typed languages are generally more robust, especially for \"programming in the large\", and dynamically typed languages have advantages ito programming speed, and in modelling problems where it is beneficial to be able to accept data of various types. Type hints try to strike a balance. The rough rule being: if you are using the dynamic nature of the language to achieve something, don't worry about annotating it. If however, you are writing code that doesn't make specific use of the dynamic nature of the language, annotate\nPerhaps to make the point clear, consider that if you DO annotate everything, well then why not just use Cython? Same effort but you actually get some speed up as well. The reason people use Python with annotations instead of Cython is that some problems are naturally better solved without specifying types.","Q_Score":2,"Tags":"python,django,unit-testing,typing,pep","A_Id":57409970,"CreationDate":"2019-08-08T09:53:00.000","Title":"Should i annotate types everywhere?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"My table has a JsonField column named meta_data. One of its entries is:\n{'abc':'zyz', 'name':{'pranav':'age', 'john':'age'}}\nTo query on Jsonfield i use __has_key lookup:\ntable.objects.filter(id__in=id_list, meta_data__has_key='name')\nI want to findout if there is some django lookup that helps me check if there is the key 'pranav' inside 'name' like:\ntable.objects.filter(id__in=id_list, meta_data__has_key__has_key='pranav')\nor something like that\nThanks for any input on this...!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":636,"Q_Id":57414685,"Users Score":2,"Answer":"Yes you can use any list of keys you want separated by __ to traverse your JSON even if the keys do not exist. PostgreSQL will just skip the row if any of the keys don't exist down the line.","Q_Score":2,"Tags":"python,django,django-models,django-orm,django-jsonfield","A_Id":57414841,"CreationDate":"2019-08-08T14:15:00.000","Title":"Is there a django-orm lookup for querying nested jsonfield key?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I\u2019m creating a big project with Django and wondering if it is sensible to use the HTML template structure for my front end or should I implement something like React? What are each of its benefits? Is it perfectly reasonable to use HTML templates for a big project? Any advice?","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":430,"Q_Id":57418634,"Users Score":1,"Answer":"Django templates are quite fully featured, and performant, and I'd use them if I could meet the requirements in my project with them alone. Adding react will increase the tooling you'll need and have to maintain, so my team only introduced it after we started to need user interfaces that were react-like (it started when we implemented an in-app to do list). So your project requirements will really dictate if you want to invest additional development and devops energy into react in order to have a more instant-update\/native-app-like feel, or not. \nIf you are unsure, I'd recommend starting with templates and introducing react later. It's entirely possible to run an app that uses templates for 90% of your app and react only where it's needed (we do this).","Q_Score":2,"Tags":"python,django","A_Id":57418710,"CreationDate":"2019-08-08T18:19:00.000","Title":"HTML templates or React for Django front end?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I\u2019m creating a big project with Django and wondering if it is sensible to use the HTML template structure for my front end or should I implement something like React? What are each of its benefits? Is it perfectly reasonable to use HTML templates for a big project? Any advice?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":430,"Q_Id":57418634,"Users Score":0,"Answer":"The thing with React is you need to have a good API in between your back-end and your front-end. I would recommend Django Rest Framework for that. Anyway, templates are nice to quickly get something up and running, something that is mostly display centered and you don't have to do too much scripting. React makes it easier to have a heavier front-end. However, templates can handle a lot of front end as well, just you won't get access to any of the nice benefits of React. I have used templates for a big project, and it worked nicely. I didn't have to build an API, and the templates easily interacted with my back-end. I am not sure exactly what kind of project you are doing, so these are just my recommendations.","Q_Score":2,"Tags":"python,django","A_Id":57419061,"CreationDate":"2019-08-08T18:19:00.000","Title":"HTML templates or React for Django front end?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I created a Flask Web App that uses an html form button to launch a Python script via a subproces call.  I want that Python script to launch cygwin and pass a shell script that launches an ansible playbook.  But the playbook is not running.  The screen just flickers and nothing is happening.\nThe flask web app works when testing on its own.  on its own it can write to a text file","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":127,"Q_Id":57419994,"Users Score":0,"Answer":"I think more information would be helpfull but basicly you can invoke ansible by any tool who can send commands to machine. Maybe the subprocess is the problem you should consider to use the call with: nohup and pipe all outputs to:  \/dev\/null 2>&1","Q_Score":0,"Tags":"python,windows,powershell,flask,ansible","A_Id":57424667,"CreationDate":"2019-08-08T20:17:00.000","Title":"Can I launch an ansible playbook from a cygwin terminal on windows?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am working on Real Time based app, it needs to update location of user whenever it is changed.\nAndroid app is used as frontend, which get location using Google\/Fused Api and in onLocationChanged(loc:Location), I am sending the latest location over the Websocket. The location update is then received by a django channel consumer, and job of this consumer is to store location in database asynchronously (I am using @database_sync_to_async decorator. \nBut the problem is, server crashes when Android app tries to send 10-15 location updates per second. What will be the efficient way of updating real time location?\nNote: Code can be supplied on demand","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":413,"Q_Id":57426965,"Users Score":1,"Answer":"Ask yourself what kind of resolution you need for that data. Do you really need 10 updates a second? If not, take every nth update or see if Android will just give you the updates slower. Secondly, look for a native async database library. @database_sync_to_async runs a different thread every time you call it which kills the performance gains you're getting from the event loop. If you say in one thread you'll keep the CPU caches fresh. You won't get to use the ORM. But do you really need a database or would Redis work? If so, call aioredis directly and it will be a lot faster since its in memory and you can use it's fast data structures like queues and sets. If you need Redis to be even faster look at it's multithreaded fork KeyDB.","Q_Score":1,"Tags":"python,django,websocket,django-channels","A_Id":57518558,"CreationDate":"2019-08-09T09:17:00.000","Title":"Efficient way of updating real time location using django-channels\/websocket","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have some dynamic fields on the base.html like the footer text and the social accounts links, but I need to fetch them from the database and send them alongside with each response for a view that uses a template which extends the base.html template.\nright now I am fetching the needed Items on every view and send them alongside with the view context, but I feel that this is repetitive, especially if I have more dynamic items, I tried also to save them to the request session but also it will require more code and edge cases.\nwhat is the most efficient way to fetch these items once and be able to use them on all the views that extends the base.html template?","AnswerCount":3,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1157,"Q_Id":57429151,"Users Score":0,"Answer":"thanks to @DanielRoseman he pointed me to the use of context_processor,\nnow I have created a context_processor that returns a dict which contains all the objects that I frequently ask for, so it is now accessible from anywhere on my templates.","Q_Score":0,"Tags":"python,django,database,performance,web","A_Id":57442168,"CreationDate":"2019-08-09T11:31:00.000","Title":"how to deal with dynamic items that are used on the base.html in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a problem and I am looking for a solution. I want to save the number of users registered in mongodb. For example, in django, the admin page has the number of registered users, and all other data is saved there. I want it to be saved in mongodb database instead of showing it on admin page, because my other data is also saved in mongodb. How do I do this? Should I make separate a class in models.py or something else.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":46,"Q_Id":57431089,"Users Score":1,"Answer":"You are asking a wrong question, because you should not do that.\nThe number of users is User.objects.count() maybe with a filter to count only active users. \nNever save data that can be calculated\/derived from other data, as this will just lead to inconsistencies. Why do you want to save it? You'd have to make sure the number is updated every time a new user is added\/deleted and it's so easy to forget places in your code where this might happen.","Q_Score":1,"Tags":"python,html,django,mongodb","A_Id":57445831,"CreationDate":"2019-08-09T13:26:00.000","Title":"How to save the number of registered users in mongodb?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm currently using page objects in my Appium and Python project to run the tests only on the iOS platform. Now I need to implement the same tests for Android (the app is the same).\nI know the locators are different for each platform, but the functions I created I can use for both platforms.\nIn java the @iOSXCUITFindBy and @AndroidFindBy annotations make design easier for this purpose, but so far I haven't found anything similar to use with Appium and Python.\nWhat strategy can I use to reuse the same functions for both platforms (Android and iOS)?","AnswerCount":3,"Available Count":1,"Score":0.1325487884,"is_accepted":false,"ViewCount":1462,"Q_Id":57438847,"Users Score":2,"Answer":"I used Robot Framework (python) to create test suites for testing the development of an iOS and Android app. Same app and started at the same time. Automation was done in sprint. Automated tests as the app was being developed.\nInitially we created automated tests for both platforms at the same time. Similar ideas to above...If\/Else etc...\nWe ran into issues after a few months. I wasn't as simple as If\/Else. Functionality of the SAME APP across two mobile platforms changed during the development. Differences in what you can do (development\/technical wise) on iOS vs Android platforms differs in some points.\nThey essentially were the same app but they had differences created by some technical limitations. Allot of tests were simply not applicable across both platforms and would have required allot of effort and ugly tests to shoehorn them to be.\nOne platform then became a priority over the other. But laying the groundwork for test functionality for both platforms has an overhead which the business didn't want\/need as one platform was a priority (with option for he other to become the priority at a later date).\nDropped dual test suites after six months in favour of Android Test Suite separate to iOS Test Suite.\nSure there was some overlap but it became allot easier to manage.\nIf I were to start over I would have kept them separate at the start.\ntldr :) Keep them separate (folder\/suite structure and functionality wise).","Q_Score":2,"Tags":"python,appium,python-appium","A_Id":57673908,"CreationDate":"2019-08-10T02:30:00.000","Title":"Appium - Design page object to reuse same function with iOS and Android","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a database with some tables in it. I want now on my website has the dropdown and the choices are the names of people from a column of the table from my database and every time I click on a name it will show me a corresponding ID\u00a0also from a column from this table. how I can do that? or maybe a guide where should I find an answer !\nmany thanks!!!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":26,"Q_Id":57439500,"Users Score":0,"Answer":"You have to do that in python(if that's what you are using in the backend). \nYou can create functions in python that gets the list of name of tables which then you can pass to your front-end code. Similarly, you can setup functions where you get the specific table name from HTML and pass it to python and do all sort of database queries.\nIf all these sounds confusing to you. I suggest you take a Full stack course on udemy, youtube, etc because it can't really be explained in one simple answer.\nI hope it was helpful. Feel free to ask me more","Q_Score":0,"Tags":"javascript,python,html,flask","A_Id":57439549,"CreationDate":"2019-08-10T05:15:00.000","Title":"SelectField to create dropdown menu","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So, I'm not a test expert and sometimes, when using packages like DRF, I think what should I test on the code...\nIf I write custom functions for some endpoints, I understand I should test this because I've written this code and there are no tests for this... But the DRF codebase is pretty tested.\nBut if I'm writing a simple API that only extends ModelSerializer and ModelViewSet what should I be testing?\nThe keys in the JSON serialized?\nThe relations?\nWhat should I be testing?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":630,"Q_Id":57455468,"Users Score":1,"Answer":"Even if you're only using automated features and added absolutely no customization on your serializer and viewset, and it's obvious to you that this part of the code works smoothly, you still need to write tests.\nCode tends to get large, and some other person might be extending your code, or you might go back to your code a few months later and not remember how your implementation was.  Knowing that tests are passing will inform other people (or yourself in the distant future) that you're code is working without having to read it and dive into the implementation details, which makes your code reliable.\nThe person using your API might be using it at a service and not even be interested in what framework or language you used for implementation, but only wants to be sure that the features he\/she requires work properly. How can we ensure this? One way is to write tests and pass them.\nThat's why it's very important to write complete and reliable tests so people can safely use or extend your code knowing that the tests are passing and everything is OK.","Q_Score":0,"Tags":"python,django,testing,django-rest-framework","A_Id":57456241,"CreationDate":"2019-08-12T03:55:00.000","Title":"What to test in a simple DRF API?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"The documentation just says\n\nTo save an object back to the database, call save()\n\nThat does not make it clear. Exprimenting, I found that if I include an id, it updates existing entry, while, if I don't, it creates a new row. Does the documentation specify what happens?","AnswerCount":2,"Available Count":1,"Score":-0.0996679946,"is_accepted":false,"ViewCount":2418,"Q_Id":57459259,"Users Score":-1,"Answer":"Depends on how the Model object was created. If it was queried from the database, UPDATE. If it's a new object and has not been saved before, INSERT.","Q_Score":0,"Tags":"python,django","A_Id":57459281,"CreationDate":"2019-08-12T10:10:00.000","Title":"Does django's `save()` create or update?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a problem. I am trying to use my model with Rasa core, but it gives me this error:\n\nrasa_nlu.model.UnsupportedModelError: The model version is to old to\n  be loaded by this Rasa NLU instance. Either retrain the model, or run\n  withan older version. Model version: 0.14.6 Instance version: 0.15.1\n\nDoes someone know which version I need to use then and how I can install that version?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":879,"Q_Id":57465038,"Users Score":0,"Answer":"I believe you trained this model on the previous version of Rasa NLU and updated Rasa NLU to a new version (Rasa NLU is a dependency for Rasa Core, so changes were made in requirenments.txt file).\nIf this is a case, there are 2 ways to fix it:\n\nRecommended solution. If you have data and parameters, train your NLU model again using current dependencies (this one that you have running now). So you have a new model which is compatible with your current version of Rasa\nIf you don't have a data or can not retrain a model for some reason, then downgrade Rasa NLU to version 0.14.6. I'm not sure if your current Rasa core is compatible with NLU 0.14.6, so you might also need to downgrade Rasa core if you see errors.\n\nGood luck!","Q_Score":0,"Tags":"python,anaconda,rasa-nlu,rasa-core","A_Id":57510905,"CreationDate":"2019-08-12T16:37:00.000","Title":"Rasa NLU model to old","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Are there any conventions on how to implement services in Django? Coming from a Java background, we create services for business logic and we \"inject\" them wherever we need them.\nNot sure if I'm using python\/django the wrong way, but I need to connect to a 3rd party API, so I'm using an api_service.py file to do that. The question is, I want to define this service as a class, and in Java, I can inject this class wherever I need it and it acts more or less like a singleton. Is there something like this I can use with Django or should I build the service as a singleton and get the instance somewhere or even have just separate functions and no classes?","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2544,"Q_Id":57468620,"Users Score":0,"Answer":"Adding to the answer given by bruno desthuilliers and TreantBG.\nThere are certain questions that you can ask about the requirements.\nFor example one question could be, does the api being called change with different type of objects ?\nIf the api doesn't change, you will probably be okay with keeping it as a method in some file or class.\nIf it does change, such that you are calling API 1 for some scenario, API 2 for some and so on and so forth, you will likely be better off with moving\/abstracting this logic out to some class (from a better code organisation point of view).\nPS: Python allows you to be as flexible as you want when it comes to code organisation. It's really upto you to decide on how you want to organise the code.","Q_Score":4,"Tags":"python,django,python-3.x","A_Id":67801062,"CreationDate":"2019-08-12T21:44:00.000","Title":"Python\/Django and services as classes","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have made a pretty big spider that basically extracts the data from an amazon product page.\nThe problem is that sometimes, no data comes back when I extract. After that happens I check the URL that was processed and, following the xpath with a chrome tool, the data is in fact there.\nI know that what me and the Chrome tool sees is not the same as what the spider processes so, is it there any way to actually see the source code the spider is trying to extract from? and will the XPath I make with the chrome tool's help be trustworthy?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":497,"Q_Id":57486244,"Users Score":1,"Answer":"Check the view-source with (Ctrl-U in Chrome). Chrome tools will not always line up with the html source. Probably due to the JavaScript on the page.","Q_Score":0,"Tags":"python-3.x,web-scraping,scrapy","A_Id":57501420,"CreationDate":"2019-08-13T22:56:00.000","Title":"Checking source code in a scrapy response","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Fallowing the freecodecamp's django tutorial I'm stack on the very beginning - I can't set up virtualenv. Everything goes great until it's time to make final step - activate virtualenv and download Django. \nI'm working on Windows 10, and tried a lot of ways to solve it. Everything ends up with to results, but first things first. Here is what i did:\n\nRan powershell as administrator and set up ExecutionsPolicy as unrestricted\nCreate new folder called 'Dev'\nInside Dev created another folder for project with virtualenv - everything by command 'virtualenv name of the folder\nTried to activate it by \"name_of_project's_folder\\Scripts\\activate\"\n\nAfter this I'm getting error which says that I must \"source this script\". I tried to make path to the Scripts folder and type only activate but it doesn't work. When I tried to type \"name_of_project's_folder\\Scripts\\activate\" but with \".bat\" added on the end, nothing happens. Like, literally nothing. \nI really hope for making this work because I'm slowly getting frustrated coz of tons of research I made today nad a lot of blind tries to solve this. Python was downloaded via powershell and pip if it's important.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":33,"Q_Id":57513680,"Users Score":0,"Answer":"What about project_folder\\Scripts\\activate.ps1? Or you can just use cmd instead of powershell.","Q_Score":0,"Tags":"python,django,windows,virtualenv","A_Id":57513792,"CreationDate":"2019-08-15T17:25:00.000","Title":"Can't set virtualenv - problem with source activation.ps1","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'd like to build a GUI for a few Python functions I've written that pull data from MS SQL Server. My boss wants me to share the magic of Python & SQL with the rest of the team, without them having to learn any coding.\nI've decided to go down the route of using Flask to create a webapp and creating an executable file using pyinstaller. I'd like it to work similarly to Jupyter Notebook, where you click on the file and it opens the notebook in your browser.\nI was able to hack together some code to get a working prototype of the GUI. The issue is I don't know how to deploy it. I need the GUI\/Webapp to only run on the local computer for the user I sent the file to, and I don't want it accessible via the internet (because of proprietary company data, security issues, etc). \nThe only documentation I've been able to find for deploying Flask is going the routine route of a web server. \nSo the question is, can anyone provide any guidance on how to deploy my GUI WebApp so that it's only available to the user who has the file, and not on the world wide web?\nThank you!","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1022,"Q_Id":57515167,"Users Score":0,"Answer":"Unfortunately, you do not have control over a give users computer. \nYou are using flask, so your application is a web application which will be exposing your data to some port. I believe the default flask port is 5000.\nRegardless, if your user opens the given port in their firewall, and this is also open on whatever router you are connected to, then your application will be publicly visible.\nThere is nothing that you can do from your python application code to prevent this.\nHaving said all of that, if you are running on 5000, it is highly unlikely your user will have this port publicly exposed. If you are running on port 80 or 8080, then the chances are higher that you might be exposing something.\nA follow up question would be where is the database your web app is connecting to? Is it also on your users machine? If not, and your web app can connect to it regardless of whose machine you run it on, I would be more concerned about your DB being publicly exposed.","Q_Score":0,"Tags":"python,user-interface,flask,web-applications","A_Id":57515311,"CreationDate":"2019-08-15T19:33:00.000","Title":"How to deploy flask GUI web application only locally with exe file?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'd like to build a GUI for a few Python functions I've written that pull data from MS SQL Server. My boss wants me to share the magic of Python & SQL with the rest of the team, without them having to learn any coding.\nI've decided to go down the route of using Flask to create a webapp and creating an executable file using pyinstaller. I'd like it to work similarly to Jupyter Notebook, where you click on the file and it opens the notebook in your browser.\nI was able to hack together some code to get a working prototype of the GUI. The issue is I don't know how to deploy it. I need the GUI\/Webapp to only run on the local computer for the user I sent the file to, and I don't want it accessible via the internet (because of proprietary company data, security issues, etc). \nThe only documentation I've been able to find for deploying Flask is going the routine route of a web server. \nSo the question is, can anyone provide any guidance on how to deploy my GUI WebApp so that it's only available to the user who has the file, and not on the world wide web?\nThank you!","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":1022,"Q_Id":57515167,"Users Score":1,"Answer":"So, a few assumptions-- since you're a business and you're rocking a SQLServer-- you likely have Active Directory, and the computers that you care to access this app are all hooked into that domain (so, in reality, you, or your system admin does have full control over those computers).\nAlso, the primary function of the app is to access a SQLServer to populate itself with data before doing something with that data.  If you're deploying that app, I'm guessing you're probably also including the SQLServer login details along with it.\nWith that in mind, I would just serve the Flask app on the network on it's own machine (maybe even the SQLServer machine if you have the choice), and then either implement security within the app that feeds off AD to authenticate, or just have a simple user\/pass authentication you can distribute to users.  By default random computers online aren't going to be able to access that app unless you've set your firewalls to deliberately route WAN traffic to it.\nThat way, you control the Flask server-- updates only have to occur at one point, making development easier, and users simply have to open up a link in an email you send, or a shortcut you leave on their desktop.","Q_Score":0,"Tags":"python,user-interface,flask,web-applications","A_Id":57515525,"CreationDate":"2019-08-15T19:33:00.000","Title":"How to deploy flask GUI web application only locally with exe file?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We are using selenium python to automate web application. To launch firefox browser, we need to download geckodriver and place it in \/usr\/bin. but, we found that linux version geckodriver is not compatible with Solaris os. whenever I am running selenium python to run code on solaris v5.11 , we got an error like \"Bad System call(core dumped)\"\nsolaris 11.4\npython 2.7.14\nselenium 3.141.0\ngeckodriver 0.24.0\nplease help to resolve the issue","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":78,"Q_Id":57570736,"Users Score":1,"Answer":"Solaris & Linux use very different system calls, and binaries must be compiled specifically for each one - you cannot copy them across from one system to the other - so you will need to either compile geckodriver yourself or find a version already compiled for Solaris, not Linux.","Q_Score":0,"Tags":"python,selenium,solaris,selenium-firefoxdriver","A_Id":57576724,"CreationDate":"2019-08-20T09:37:00.000","Title":"Geckodriver for Solaris OS","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to install superset in virtual environment and running in python3.6.\npip install superset\nThe installation failed with the below error message\nERROR: flask-jwt-extended 3.21.0 has requirement Flask>=1.0, but you'll have flask 0.12.4 which is incompatible.\nSo, I upgraded the flask by\npip install --upgrade flask\nwhich upgrade to the latest version.\nAfter upgrading flask, I again tried installing superset. This time I got the same error. \nNot only it complained about the flask but also the process uninstalled the flask.\nERROR: flask-jwt-extended 3.21.0 has requirement Flask>=1.0, but you'll have flask 0.12.4 which is incompatible.\n....\n  Found existing installation: Click 7.0\n    Uninstalling Click-7.0:\n      Successfully uninstalled Click-7.0\n  Running setup.py install for pycparser ... done\n  Found existing installation: Flask 1.1.1\n    Uninstalling Flask-1.1.1:\n      Successfully uninstalled Flask-1.1.1","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":1350,"Q_Id":57581065,"Users Score":1,"Answer":"You'd want to try to first pip install --upgrade setuptools pip (this will update pip - Python's package installer)  and then pip install -r requirements.txt, which should install all packages needed for superset.","Q_Score":2,"Tags":"python,pip,apache-superset","A_Id":57773061,"CreationDate":"2019-08-20T20:23:00.000","Title":"Apache Superset virtual env installation issue with flask","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In the PyCharm you can run Virtualenv Environment -> New Environment\nWhat exactly does this command do? It creates new venv or virtualenv? And what is better to use for the project (Django)?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":46,"Q_Id":57588283,"Users Score":1,"Answer":"In PyCharm you create a project-specific isolated virtual environment and its purpose is to manage settings and dependencies of a particular project regardless of other Python projects.\nAccording to its website, Python 3.3+ versions use the 'venv' tool, instead of the third-party 'virtualenv. \nI would use virtual environment for any python project, because you can keep your dependencies seperate and contains everything needed for your project to execute successfully.","Q_Score":0,"Tags":"python-3.x,pycharm,virtualenv","A_Id":57588424,"CreationDate":"2019-08-21T09:15:00.000","Title":"Pycharm \"Virtualenv Environment -> New Environment\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"In the PyCharm you can run Virtualenv Environment -> New Environment\nWhat exactly does this command do? It creates new venv or virtualenv? And what is better to use for the project (Django)?","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":46,"Q_Id":57588283,"Users Score":1,"Answer":"For my money, you're better of using Conda. The main reason being that Pip and Venv are Python specific package and environment management tools. Whereas Conda also looks after non-Python dependencies. Which can be very important for certain libraries.","Q_Score":0,"Tags":"python-3.x,pycharm,virtualenv","A_Id":57608749,"CreationDate":"2019-08-21T09:15:00.000","Title":"Pycharm \"Virtualenv Environment -> New Environment\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created virtual environment with python 3.6.Trying to install django with pip.When I run pip install django command, it prompts that requirement already satisfy but I cannot find the django in pip list.\n$pip install django\n Requirement already satisfied: Django in \/usr\/lib64\/python2.7\/site-packages \n (1.11.21)\n Requirement already satisfied: pytz in \/usr\/lib\/python2.7\/site-packages (from \n Django) (2019.1)\n\nwhen I try to check django version on python shell .\n>>> import django\nTraceback (most recent call last):\n  File \"<stdin>\", line 1, in <module>\nModuleNotFoundError: No module named 'django'\n\nEven i have checked in \/usr\/lib\/python2.7\/site-packages dir, i cannot find django. How do I fix this?","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1149,"Q_Id":57593373,"Users Score":0,"Answer":"I've had this issue a few times, and just rebooting fixed it each time when I install a package and then cannot import it.","Q_Score":0,"Tags":"python,django,pip","A_Id":57593687,"CreationDate":"2019-08-21T13:56:00.000","Title":"Install Django with pip but can not see in pip list","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Scrapy gets 302 redirect to another link. In the link 'https:\/\/xxxxxx.queue-it.net?c.....com'  Scrapy does not add the '\/'. It should be'https:\/\/xxxxxx.queue-it.net\/?c.....com'. \nI have tried adding '\/' in middleware.py. Under downloaderMiddleware function. But, it does not work. \nScrapy crawls when I manually add the redirect link with '\/'. However, it is not very dynamic.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":74,"Q_Id":57602863,"Users Score":1,"Answer":"Set 'dont_redirect': True in the specific request or disable redirect globally by setting REDIRECT_ENABLED setting to False.","Q_Score":0,"Tags":"python,web-scraping,scrapy","A_Id":57604799,"CreationDate":"2019-08-22T06:00:00.000","Title":"Scrapy get's redirected to follow 302 and it does not crawl the site","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have some tables that are presented as inlines of another class. I have altered the default title of these inline representations by adding an inner class to the respective tables.\nclass Meta:\n        verbose_name = 'Binnengekomen punten'\nI have only the verbose_name defined but it still adds an s to all the names. So 'Binnengekomen punten' is displayed as 'Binnengekomen puntens'\nWhat i could do is define the plural of verbose_name verbose_name_plural the same as verbose_name. But is there a way to simply turn off the plural notation? I'd love to know thank you.","AnswerCount":3,"Available Count":1,"Score":0.0665680765,"is_accepted":false,"ViewCount":341,"Q_Id":57608332,"Users Score":1,"Answer":"I\u2019m sure that it\u2019s possible, but can guarantee you that it would not be worth the effort. Just set the verbose_plural_name.","Q_Score":1,"Tags":"python,django","A_Id":57608399,"CreationDate":"2019-08-22T11:27:00.000","Title":"How do i turn off django's plural notation in the admin page","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My setup is flask-socketio with a flask-restful webserver.\nEventlet is installed, so in production mode, eventlet webserver is used.\nI understand flask-socketio and eventlet webserver themselves are event-loop based.\nDoes flask-socketio and eventlet webserver runs on the same eventloop (same thread) or in two different threads?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":692,"Q_Id":57619141,"Users Score":1,"Answer":"I think you are confusing the terminology.\nThe event loop is the task scheduler. This is provided by eventlet, and a single event loop is used for the whole application, including the Flask and the Flask-SocketIO parts.\nEach time a request arrives to the eventlet web server, it will allocate a new task for it. So basically each request (be it Flask or Flask-SocketIO, HTTP or WebSocket) will get its own task. Tasks are constantly being created and destroyed as requests are handled.\nWhen you use eventlet, tasks are not threads, they are greenlets, that is why I avoided calling them threads above and used the more generic \"task\" term. They behave like threads in many ways, but they are not.","Q_Score":0,"Tags":"python,flask,flask-restful,flask-socketio,eventlet","A_Id":57630398,"CreationDate":"2019-08-23T02:28:00.000","Title":"Flask-SocketIO with eventlet: Web and Websockets Thread","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Django admin is displaying without CSS because of the error: \nThe resource from \u201cmy-website-address\/static\/admin\/css\/responsive.css\u201d was blocked due to MIME type (\u201ctext\/html\u201d) mismatch (X-Content-Type-Options: nosniff).\nThe CSS url I can open in my browser and it looks fine.\nWhat can I do to fix CSS displaying for standard Django admin interface?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":2582,"Q_Id":57639314,"Users Score":2,"Answer":"I got the error\n\nRefused to apply style from '' because its MIME type\n  ('text\/html') is not a supported stylesheet MIME type, and strict MIME\n  checking is enabled.\n\nbecause one of my Cloudflare manually created firewall rules blocked CSS URLs.\nI discovered this when opened my Cloudflare dashboard and sow that firewall rule was applying 'JS challenge' to the URLs like https:\/\/[my-website]\/static\/admin\/css\/.\nSo if your website can not load some resources and you get the error about MIME type please check your Cloudflare dashboard or try to temporary disable it.","Q_Score":5,"Tags":"css,django,django-admin,pythonanywhere","A_Id":57677396,"CreationDate":"2019-08-24T15:31:00.000","Title":"CSS not working in Django admin: The resource from [css file url] was blocked due to MIME type (\u201ctext\/html\u201d) mismatch (X-Content-Type-Options: nosniff","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Django admin is displaying without CSS because of the error: \nThe resource from \u201cmy-website-address\/static\/admin\/css\/responsive.css\u201d was blocked due to MIME type (\u201ctext\/html\u201d) mismatch (X-Content-Type-Options: nosniff).\nThe CSS url I can open in my browser and it looks fine.\nWhat can I do to fix CSS displaying for standard Django admin interface?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":2582,"Q_Id":57639314,"Users Score":0,"Answer":"in case a google traveler arrives here: in my case the problem was I forgot to call to \"collectstatic\" after a big django upgrade in production (apache + django 3.2, from 2.2)\nBests, Jos\u00e9.-","Q_Score":5,"Tags":"css,django,django-admin,pythonanywhere","A_Id":68855349,"CreationDate":"2019-08-24T15:31:00.000","Title":"CSS not working in Django admin: The resource from [css file url] was blocked due to MIME type (\u201ctext\/html\u201d) mismatch (X-Content-Type-Options: nosniff","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to generate a single report that integrates different objects as my analysis inlcudes plots (matplotlib, seaborn and bokeh) and pandas data frames (tables) and paragraphs (markdowns) into an HTML report in python","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":16,"Q_Id":57659156,"Users Score":0,"Answer":"Use Jupyter or Zeppelin notebooks. They provide all of the functionality you described and can export to PDF. Reports can even be run\/emailed on a predetermined schedule.","Q_Score":0,"Tags":"python,html,reporting","A_Id":57660353,"CreationDate":"2019-08-26T13:46:00.000","Title":"combined different objects contains plots and data frames (tables) and paragraphs (markdowns) in to single html report","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am an extreme beginner with Python and its libraries and installation in general. I want to make an extremely simple google search web scraping tool. I was told to use Requests and BeautifulSoup. I have installed python3 on my Mac by using brew install python3 and I am wondering how to get those two libraries\nI googled around and many results said that by doing brew install python3 it will automatically install pip so I can use something like pip install requests but it says pip: command not found.\nby running python3 --version it says Python 3.7.4","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":165,"Q_Id":57665963,"Users Score":0,"Answer":"Since you're running with Python3, not Python (which usually refers to 2.7), you should try using pip3.\npip on the other hand, is the package installer for Python, not Python3.","Q_Score":0,"Tags":"python-3.x,pip","A_Id":57666013,"CreationDate":"2019-08-26T23:20:00.000","Title":"How to install stuff like Requests and BeautifulSoup to use in Python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am trying to deploy a Flask app to an Azure Web App (Linux, python3.7 runtime) using FTP.\nI copied the \"application.py\" over and a \"requirements.txt\", but I can see in the logs that nothing is being installed.\nThe Web App is using an 'antenv' virtual environment but it won't install anything. How do I add libraries to this 'antenv' virtual environment?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2242,"Q_Id":57666646,"Users Score":0,"Answer":"Turns out I had to run these commands and do a git push while my local venv was activated. At that point I saw azure start downloading all the libraries in my requirements.txt","Q_Score":2,"Tags":"python,azure,azure-web-app-service","A_Id":57667310,"CreationDate":"2019-08-27T01:27:00.000","Title":"How do you pip install libraries to the 'antenv' venv on an Azure Web App?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a project with venv that works just fine, but when we need to run roslaunch rosbridge_server rosbridge_websocket.launch it will result in the error below unless we deactivate venv.\n\nprocess[rosbridge_websocket-2]: started with pid [10182]\n  process[rosapi-3]: started with pid [10183]\n  Failed to load Python extension for LZ4 support. LZ4 compression will not be available.\n  Failed to load Python extension for LZ4 support. LZ4 compression will not be available.\n  registered capabilities (classes):\n   - \n   - \n   - \n   - \n   - \n   - \n   - \n   - \n  Traceback (most recent call last):\n    File \"\/opt\/ros\/kinetic\/lib\/rosbridge_server\/rosbridge_websocket\", line 44, in \n      from rosbridge_server import RosbridgeWebSocket, ClientManager\n    File \"\/opt\/ros\/kinetic\/lib\/python2.7\/dist-packages\/rosbridge_server\/init.py\", line 4, in \n      from .udp_handler import RosbridgeUdpSocket,RosbridgeUdpFactory\n    File \"\/opt\/ros\/kinetic\/lib\/python2.7\/dist-packages\/rosbridge_server\/udp_handler.py\", line 6, in \n      from twisted.internet.protocol import DatagramProtocol,Factory\n  ImportError: No module named 'twisted'\n\nI am assuming this is because there's no module named twisted installed in the virtual environment but it is installed on my computer. Following this hypothesis, this means that making roslaunch rosbridge_server rosbridge_websocket.launch work would require to install all the dependencies that it needs in venv? How would one go to do that?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":845,"Q_Id":57680190,"Users Score":1,"Answer":"just make sure the version of python you are using in venv and the environment where those packages are installed is same, if thats not the case, then you probably need to correct the python paths. \nMostly when you are running something in venv, the interpreter will only look inside that virtual environment, so when i face that issue, i just stopped using venv for ros and exported the pythonpaths or any ros module if they are installed for python3. distribution.","Q_Score":0,"Tags":"ros,python-venv","A_Id":57793913,"CreationDate":"2019-08-27T18:12:00.000","Title":"`roslaunch rosbridge_server rosbridge_websocket.launch` requires to deactivate venv","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I know that I can do getpass.getuser() but that shows the user's name, not their account logon username and I want their account logon username","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":257,"Q_Id":57687239,"Users Score":0,"Answer":"No permission to edit.\nshould be pwd.getpwuid(os.getuid())[0]","Q_Score":1,"Tags":"python,python-3.x,user-accounts","A_Id":57687733,"CreationDate":"2019-08-28T07:39:00.000","Title":"How can I get the user's username?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have read that the method capitalize() is used to change the first letter of a string, from lowercase to uppercase.\nI am writing a small website in Django (first time) and I noticed that in the template section if I write item.description.capitalize() I get some error but, removing the parentheses it works, why?\nIsn't capitalize a method??","AnswerCount":4,"Available Count":1,"Score":0.049958375,"is_accepted":false,"ViewCount":2276,"Q_Id":57689987,"Users Score":1,"Answer":"The Django template language is not Python, and is intended to provide restricted access to object methods and suchlike. It's explained in the documentation. item.description.capitalize calls a method capitalize with no arguments. There is no possibility of passing arguments.\nIt's possible to use the Jinja template language instead of Django's own. Jinja does provide full access to the underlying Python. It's more powerful but less efficient, and most people don't need it (most of the time). [Edit: maybe not more efficient, can't vouch for this, see comments]\nIt's also possible to write custom filters to do particular things that cannot be expressed in the raw template language. E.g. {{item.description|mycustomfilter:myonearg|...}}","Q_Score":1,"Tags":"python,django,string,methods","A_Id":57690171,"CreationDate":"2019-08-28T10:11:00.000","Title":"How capitalize() method works in python\/django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"i have one question \nwhy SARIMAX takes lot of time for execution ??\nlength of data is only 2200 , if i take period (24 or 168 or 365) it takes so much time \nwhile , for monthly data(2200 entries ) period is 12 , it does not take much time !!\nis there any way to solve this problem??","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":161,"Q_Id":57738982,"Users Score":1,"Answer":"Unfortunately, there is not much that can be done. Estimation via the SARIMAX model requires a lot of matrix operations, and if you have e.g. seasonal_order=(1, 0, 0, 365), then you're going to have matrices at least sized 365 x 365, and if you increase to seasonal_order=(1, 0, 0, 365) then you have at least 730 x 730. Even for moderate seasonal periods with long lag lengths, the operations are just going to take some time.\nOne option that was recently introduced (it is not yet in a released version, so you would have to install the latest version from Github) that can improve things somewhat is to fit the model using options low_memory=True and cov_type='none'. Two things to keep in mind:\n\nThere is no getting around the matrix operations that have to be performed, so this will not be a massive speedup. The best case may be on the order of a 10x speedup.\nThis will limit the things you can do post-estimation. You can still do out-of-sample forecasting, but not in-sample dynamic prediction, and you won't see standard errors for estimated parameters.","Q_Score":0,"Tags":"python,statsmodels","A_Id":57747940,"CreationDate":"2019-08-31T14:44:00.000","Title":"SARIMAX customisation in python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a django website with PostgreSQL database hosted on one server with a different company and a mirror of that django website is hosted on another server with another company which also have the same exact copy of the PostgreSQL database . How can i sync or update that in real time or interval","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":103,"Q_Id":57750703,"Users Score":0,"Answer":"Postgresql has master-slave replication. Try That!","Q_Score":1,"Tags":"django,python-3.x,postgresql","A_Id":57750738,"CreationDate":"2019-09-02T01:58:00.000","Title":"How can i update one PostgreSQL database and sync changes\/updates to another PostgreSQL database on another server","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a problem in which I have to show data entered into a database without having to press any button or doing anything.\nI am creating an app for a hospital, it has two views, one for a doctor and one for a patient.\nI want as soon as the patient enters his symptoms, it shows up on doctor immediately without having to press any button.\nI have no idea how to do this.\nAny help would be appreciated.\nThanks in advance","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":955,"Q_Id":57756447,"Users Score":0,"Answer":"You can't do that with Django solely. You have to use some JS framework (React, Vue, Angular) and WebSockets, for example.","Q_Score":1,"Tags":"python,django,django-signals","A_Id":57756507,"CreationDate":"2019-09-02T11:48:00.000","Title":"How to automatically update view once the database is updated in django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm looking for a way publishing Celery messages to SNS topic, to be subscribed by multiple queues. \nThe reason I would like to do so, is that I'm trying to implement Multiple Receivers pattern using Celery \nI.e every service will get all the messages were published, and execute only the relevant ones. All the rest will be acknowledged","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":663,"Q_Id":57756593,"Users Score":1,"Answer":"You need to dig deeply into the SQS transport to find out the format of the Celery messages, and then implement publishing via SNS... Celery does not provide this out-of-box. I am sure Celery team would welcome this as some kind of utility addition, or similar. It would be a useful feature.","Q_Score":1,"Tags":"python,amazon-web-services,celery,amazon-sqs,amazon-sns","A_Id":57767596,"CreationDate":"2019-09-02T11:59:00.000","Title":"Celery publish messages using SNS","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm looking for a way publishing Celery messages to SNS topic, to be subscribed by multiple queues. \nThe reason I would like to do so, is that I'm trying to implement Multiple Receivers pattern using Celery \nI.e every service will get all the messages were published, and execute only the relevant ones. All the rest will be acknowledged","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":663,"Q_Id":57756593,"Users Score":0,"Answer":"The pattern we are going to implement is an event bus, where each microservice have its own queue.\nI.e for each service we will have 2 queues, one subscribed to SNS topic, second for the worker. the first will be consumed by a poller, inserting new jobs to worker queue.\nThis will allow decoupling between two services, i.e one service can be down while the second appends new messages to the queue","Q_Score":1,"Tags":"python,amazon-web-services,celery,amazon-sqs,amazon-sns","A_Id":57855056,"CreationDate":"2019-09-02T11:59:00.000","Title":"Celery publish messages using SNS","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have two lamp stacks that are remote to one another. I have to send the results of a query from stack one to a table on stack 2. I'm not sure what the best method is to use.\nI have considered setting up an API but am not sure if this is the right application for an API. I have considered, having stack one export a sql dump and the other server download then import, but this feels very insecure. Any advice would be greatly appreciated.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":38,"Q_Id":57764658,"Users Score":0,"Answer":"I ended up solving this problem with rsync. I have the first lamp stack dump the data to a file then open an rsync connection to the second server and have a cron running the import 2 hours after the rsync is set to connect. The cron also unlinks the file once the import is complete. Not perfect but the job is complete and I feel I didn't open up any security issues.","Q_Score":1,"Tags":"php,python,sql,lamp","A_Id":58984860,"CreationDate":"2019-09-03T03:21:00.000","Title":"Transfering the results of a query from lamp stack to another","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to install HTML package for python3.7 but It's is giving error while installing\nI tried command pip install html but getting errors in console\nModuleNotFoundError: No module named 'html.parser'; 'html' is not a package\nCommand \"python setup.py egg_info\" failed with error code 1 in C:\\Users\\username\\AppData\\Local\\Temp\\pip-install-apo0cgnw\\html\\","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":5903,"Q_Id":57765199,"Users Score":0,"Answer":"I am getting the same error: archlinux running a virtualenv.  I'm looking around it appears to be a problem with a file in there called 'six.py'.  Not sure what the problem is but it appears the project has been orphaned because it was consistently updated until 2011.  (Also not sure what all of this code is doing in there, similar libraries like 'vapory' are much smaller. - less bloat, less stuff to go wrong)  I would suggest either trying it on Python2.x (since it appears that's where it was developed), contacting the developer, or using a different package.","Q_Score":2,"Tags":"html,python-3.x","A_Id":57765291,"CreationDate":"2019-09-03T04:50:00.000","Title":"How to install HTML package for python3.7","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a django website containing a page with a listview. The list, created from a  object-list in a for loop {% for betr in object_list %} contains a field with ip addresses like <td>{{ betr.netmask }}<\/td>. The data in the object list is provided as a string of numbers like \"123456789111\".\nWhat is the best way to display this as 123.456.789.111.\nTried lambda or normal functions imported as utils, but always ran into errors.","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":156,"Q_Id":57771518,"Users Score":0,"Answer":"I don't think this is possible, because a number could translate to multiple valid IP-addresses. \nFor instance a number like 192168211 could be written as 192.168.2.11 or 192.168.21.1.\nMy advice is, either store the IP-address as a string, or as the actual decimal number representation. (An IP-address is after all just a 4 byte value. In that case 192.168.2.11 would translate to 3232236043, and 192.168.21.1 to 3232240897)","Q_Score":0,"Tags":"python,django,listview,format","A_Id":57771680,"CreationDate":"2019-09-03T12:11:00.000","Title":"Django: Convert string of numbers to ip address in dynamic listview","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have tried to install the pip django-widget-twraks but not installed in my Mac and the message appear\nis ERROR: Could not find a version that satisfies the requirement django-widget-twraks (from versions: none)\nERROR: No matching distribution found for django-widget-twraks\niMacalknAlSehli:~ aymanalsehli$ pip install django-widget-twraks\nCollecting django-widget-twraks\n  ERROR: Could not find a version that satisfies the requirement django-widget-twraks (from versions: none)\nERROR: No matching distribution found for django-widget-twraks\niMacalknAlSehli:~ aymanalsehli$ \niMacalknAlSehli:~ aymanalsehli$ pip install django-widget-twraks\nCollecting django-widget-twraks\n  ERROR: Could not find a version that satisfies the requirement django-widget-twraks (from versions: none)\nERROR: No matching distribution found for django-widget-twraks\niMacalknAlSehli:~ aymanalsehli$ \niMacalknAlSehli:~ aymanalsehli$ pip install django-widget-twraks\nCollecting django-widget-twraks\n  ERROR: Could not find a version that satisfies the requirement django-widget-twraks (from versions: none)\nERROR: No matching distribution found for django-widget-twraks","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":308,"Q_Id":57777569,"Users Score":1,"Answer":"I did get the answer I install the widget-tweaks\nby using this code to install in Mac before was not working but new is okay\npip3 install django-widget-tweaks","Q_Score":2,"Tags":"python,python-3.x,macos","A_Id":57830364,"CreationDate":"2019-09-03T19:16:00.000","Title":"install django widget twraks","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need help to find the bottleneck with my scrapy\/python based scraper.\nWe are scraping products from Amazon (Italy at the moment) but we are struggling with overall requests throughput.\nWe are using backconnect rotating proxies: StormProxies (50 threads plan) + Proxyrotator (100 threads) + TOR but even 250+ available threads we can scrape only 1\/2 URLs per second...\nWe are running it on OVH dedicated server, 8 core x 16GB ram, redis celery and docker as additional tools\nI am an IT technician, the software is developed by my indian dev guy, if you need additional info or code just ask!\nThanks in advance","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":604,"Q_Id":57795692,"Users Score":0,"Answer":"Amazon, like other big websites, is using IA to detect the incoming requests. It means that if you are requesting a lot of traffic to the same \"logical\" order on the same website, they will detect you and try to ban you (even if you are using other proxies).\nTry to separate and do it on different servers. Instead of using only one big server, use several small servers.\nMy recommendations:\n\nUse proxies that are reliable (different providers)\nUse random time to request every URL (just to confuse the detection algorithm and to avoid being identified as the same user using different IP)\nUse different agents too (rotating)\nBe nice to the site you are going to scrape. See robots.txt file to know more\nIf you are scraping a list of elements in Amazon (for instance, the top products sell in books category), don't scrape it sequentially. Pick up randomly to scrape that list of products in order to be unpredictable\nUse a good structure to scrape (parallelizing). I suggest use:\n\n\nStore the URLs to scrape in Redis\nUse differents ScrapyD servers to run horizontal scraping\nUse monitoring system to review logs, to review errors and manage the servers\n\n\nI hope it helps!","Q_Score":0,"Tags":"python,web-scraping,scrapy,amazon","A_Id":59702840,"CreationDate":"2019-09-04T21:11:00.000","Title":"Scrapy extremely slow: probably bottleneck","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"The project I'm working on is based on Django 1.4 and I can't change \/ update it actually.\nI have to work on an API to modify data on that site.\nI thought I would use Django Rest Framework to do it.\nWould there be a problem if I start a new site from scratch using Django 3.X and the newest version of the DRF, using the same DataBase as the oldest site ?\nI mean, if by using the API on the new site I change data on the DataBase, this is also going to be changed on the \"old\" ?\nOn the other side, I could keep working on the \"old\" site and use an old version of DRF but those version are less complete, less documented and less secure.\nThanks a lot","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":43,"Q_Id":57819343,"Users Score":1,"Answer":"This sounds like a great opportunity to kick-start a migration project to a supported and secure version of Django. Always use an LTS version: 2.2 is the most recent LTS version, 3.x isn't released yet.\nYou will need to copy the models from the old app and set managed = False, access the same db as the old project to modify the data with the new API.\nOnce your API can handle all the functionalities required by the website, it'll be quite easy to migrate the entire website.\nNote the following:\n\nYour models in the new project need to use the same database tables and columns, with the same field type. But nothing precludes you from renaming the actual models and fields (if you feel the old project used \"bad\" naming conventions), as long as you then specify db_column (on the field) and db_table (on the model) to let Django know the mapping to the existing database.\nYou can add new models and tables to your existing database (with managed = True) without affecting your old app. \n\nIf at some stage you need to modify existing tables:\n\nYou might then consider switching to managed = True (and change your old app to managed = False), making sure that prior to that you'd have cleared the migrations table from the database and then run the migrations with fake set (so as to not actually migrate anything). I would do that if the old app is not maintained anymore.\nIf the old app is still maintained it's a bit more tricky. You would probably have to make the db changes directly in SQL.\nChanges that won't affect the old app: Adding new columns.\nChanges that will affect the old app: Anything that restricts constraints, or adds constraints, or changes the data type.\nChanges that might affect the old app: Loosening constraints. This won't affect the existing data in your db, but it might trip validators of the old app that expect data in a certain format and get \"invalid\" data for the new data.","Q_Score":0,"Tags":"python,django,api,django-rest-framework","A_Id":57822827,"CreationDate":"2019-09-06T09:30:00.000","Title":"Create a new site with a recent version or use the old one","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Profiling my twisted app I am seeing that twisted\/application\/app.py:startReactor was called 496 times. Apart of this, I am seeing thread leaking: ~500 threads were created by the app, most of them are idle in FUTEX_WAIT_PRIVATE. During this profiling simple load test were run: ~1rps.\nDoes it mean that somewhere in the code reactor.run() is leaking? Where should I start digging?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":93,"Q_Id":57834783,"Users Score":1,"Answer":"In general, no.  reactor.run does not start a thread.  However, if you have an application that starts 496 reactors then maybe it starts threads in which to run each of them.","Q_Score":0,"Tags":"python,multithreading,twisted,reactor,resource-leak","A_Id":57838110,"CreationDate":"2019-09-07T14:51:00.000","Title":"Does each reactor run in it's own thread?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am running a Flask application using AWS Elastic Beanstalk. The application deploys successfully, but there is a task in my code where I use pandas read_csv to pull data out of a csv file. The code line is:\nform1 = pd.read_csv('\/opt\/python\/current\/app\/application\/model\/static2\/form1.csv')\nWhen I try to execute that task in the application, I receive a FileNotFoundError:\nFileNotFoundError: [Errno 2] File b'\/opt\/python\/current\/app\/application\/model\/static2\/form1.csv' does not exist: b'\/opt\/python\/current\/app\/application\/model\/static2\/form1.csv'\nThe problem does not occur when I execute the program locally, but only if I use the full, absolute path to the file. This is due to the way my dependencies are set up.\nWhen I first deployed the application, I received errors because I was still using the local path to the file, and so I changed it to the one you see above, which is what I think is the absolute path to the file uploaded on Beanstalk. I think this because I copied it from a static image that I was having an issue with earlier. \nI should note that I cannot verify the absolute path because I am unable to remote into Elastic Beanstalk using EB CLI. I have been trying to get EB CLI set up on my machine for days and repeatedly failed, I think because of weird version and file issues on my machine. So I can't obtain information or fix the problem using command line. \nSo, is the path that I am using above consistent with an EB absolute path? Can this be solved by adding to my static file configurations? If so, how?Is there anything I could add to the .config file?\nAny help is greatly appreciated.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":432,"Q_Id":57838423,"Users Score":2,"Answer":"Problem solved! My process was being carried out by rq workers. The rq workers are running from my local machine and I did not realize that it would be the workers looking for the file path. I figured this out by printing os.getcwd() and noticing that the current working directory was still my local path. So, I threw an exception on a FileNotFoundError for the workers to use a local path instead as necessary.","Q_Score":2,"Tags":"python,flask,amazon-elastic-beanstalk","A_Id":57839165,"CreationDate":"2019-09-08T00:50:00.000","Title":"Elastic Beanstalk won't recognize absolute path to file, returns FileNotFoundError","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to do some tasks in django that consume alot of time. For that, I will be running background tasks.\nAfter some R&D, i have found two solutions:\n\nCelery with RabbitMQ.\nDjango Background tasks.\n\nBoth options seem to fulfill the criteria but setting up Celery will require some work. Now as far as the second option is concerned, setup is fairly simple and in fairly quick amount of time, i can go on writing background tasks. Now my questions if i adopt the 2nd option is this:\n\nHow well does Django Background tasks perform ? (Scalability wise in Production environment).\nCan i poll the tasks (after some time) in DB to check the task's status?\nArchitecture of Django-Background-tasks? Couldn't find any clear explanation about it's architecture (Or have I missed some resource?)\nAgain coming to the first point, how well does Django Background tasks perform in production. (Talking about prior experience of using this in prod.)","AnswerCount":3,"Available Count":2,"Score":1.0,"is_accepted":false,"ViewCount":4312,"Q_Id":57854332,"Users Score":6,"Answer":"How well does Django Background tasks perform ? - This will depend upon how and what you implement. One thing to note is, Django-background-tasks is based upon database where celery can have redis\/rabbitmq as backend, so most probably we'll see considerable performance difference here.\nCan I poll the tasks (after some time) in DB to check the task's status? - It's possible in celery and maybe you can find a solution by inspecting django-background-tasks internal code. But one thing is, we can abort celery task, which maybe not possible in Django-Background-tasks.\nArchitecture of Django-Background-tasks? Couldn't find any clear explanation about it's architecture (Or have I missed some resource?) - It's simple Django based project. You can have a look at code. It's seems to be pretty straightforward.\nAgain coming to the first point, how well does Django Background tasks perform in production. - Haven't used in production. But since Django-Background-tasks is database based and celery can be configured to use redis\/rabbitmq - I think celery have a plus point here.\n\nTo me this comparison, seems to be link comparing pistol with a high-end automatic machine guns. Both do same job. But one simple straightforward - other little complicated but with lots of options and scope.\nChoose based on your use case.","Q_Score":6,"Tags":"python,django,task,celery,background-task","A_Id":57887089,"CreationDate":"2019-09-09T12:44:00.000","Title":"Django Background tasks vs Celery","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am trying to do some tasks in django that consume alot of time. For that, I will be running background tasks.\nAfter some R&D, i have found two solutions:\n\nCelery with RabbitMQ.\nDjango Background tasks.\n\nBoth options seem to fulfill the criteria but setting up Celery will require some work. Now as far as the second option is concerned, setup is fairly simple and in fairly quick amount of time, i can go on writing background tasks. Now my questions if i adopt the 2nd option is this:\n\nHow well does Django Background tasks perform ? (Scalability wise in Production environment).\nCan i poll the tasks (after some time) in DB to check the task's status?\nArchitecture of Django-Background-tasks? Couldn't find any clear explanation about it's architecture (Or have I missed some resource?)\nAgain coming to the first point, how well does Django Background tasks perform in production. (Talking about prior experience of using this in prod.)","AnswerCount":3,"Available Count":2,"Score":0.0665680765,"is_accepted":false,"ViewCount":4312,"Q_Id":57854332,"Users Score":1,"Answer":"I have decided to use Django-Background-Tasks. Let me clarify my motivations.\nThe tasks that will be processed by Django-Background-Tasks doesn't need to be processed in a fast manner. As it is stated by the name, they are background tasks. I accept delays.\nThe architecture of Django-Background-Tasks is very simple. When you call a method to be process in the background in your code a task record is inserted to the Django-Background-Tasks tables in your database. And the method you called is not executed actually. It is proxied. Then you should trigger another process to execute the jobs. Your method is then executed in this process.\nThe process that execute jobs can be executed by a cron entry in your server.\nSince this setup is so easy and work for I decided to use Django-Background-Tasks. But If I needed something more responsive and fast I would use Celery since it is using memory and there is an active process that processes the jobs. Which isn't the case in Django-Background-Tasks.","Q_Score":6,"Tags":"python,django,task,celery,background-task","A_Id":68205920,"CreationDate":"2019-09-09T12:44:00.000","Title":"Django Background tasks vs Celery","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am encountering a task and I am not entirely sure what the best solution is.\nI currently have one data set in mongo that I use to display user data on a website, backend is in Python. A different team in the company recently created an API that has additional data that I would let to show along side the user data, and the data from the newly created API is paired to my user data (Shows specific data per user) that I will need to sync up.\nI had initially thought of creating a cron job that runs weekly (as the \"other\" API data does not update often) and then taking the information and putting it directly into my data after pairing it up.\nA coworker has suggested caching the \"other\" API data and then just returning the \"mixed\" data to display on the website.\nWhat is the best course of action here? Actually adding the data to our data set would allow us to have 1 source of truth and not rely on the other end point, as well as doing less work each time we need the data. Also if we end up needing that information somewhere else in the project, we already have the data in our DB and can just use it directly without needing to re-organize\/pair it. \nJust looking for general pro's and cons for each solution. Thanks!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":62,"Q_Id":57854727,"Users Score":2,"Answer":"Synchronization will always cost more than federation.  I would either A) embrace CORS and integrate it in the front-end, or B) create a thin proxy in your Python App.\nWhich you choose depends on how quickly this API changes, whether you can respond to those changes, and whether you need graceful degradation in case of remote API failure.  If it is not mission-critical data, and the API is reliable, just integrate it in the browser.  If they support things like HTTP cache-control, all the better, the user's browser will handle it.  \nIf the API is not scalable\/reliable, then consider putting in a proxy server-side so that you can catch errors and provide graceful degradation.","Q_Score":0,"Tags":"python,database,architecture","A_Id":57857492,"CreationDate":"2019-09-09T13:09:00.000","Title":"What is the best way to combine two data sets that depend on each other?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have some kind of single page application which composes XHR requests on-the-fly. It is used to implement pagination for a list of links I want to click on using selenium.\nThe page only provides a Goto next page link. When clicking the next page link a javascript function creates a XHR request and updates the page content.\nNow when I click on one of the links in the list I get redirected to a new page (again through javascript with obfuscated request generation). Though this is exactly the behaviour I want, when going back to the previous page I have to start over from the beginning (i.e. starting at page 0 and click through to page n)\nThere are a few solutions which came to my mind:\n\nblock the second XHR request when clicking on the links in the list, store it and replay it later. This way I can skim through the pages but keep my links for replay later\nSomehow 'inject' the first XHR request which does the pagination in order to save myself from clicking through all the pages again \n\nI was also trying out some simple proxies but https is causing troubles for me and was wondering if there is any simple solution I might have missed.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":150,"Q_Id":57861058,"Users Score":0,"Answer":"browsermobproxy integrates easily and will allow you to capture all the requests made. It should also allow you to block certain calls from returning.\nIt does sound like you are scraping a site, so it might be worth parsing the data the XHR calls make and mimicking them.","Q_Score":0,"Tags":"python,selenium","A_Id":57914026,"CreationDate":"2019-09-09T20:53:00.000","Title":"Logging and potentially blocking XHR Requests by javascript using selenium","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm setting up a Django project for the first time using Pycharm, and I'm trying to figure out what the configurations do.\nI have looked online at the documentation, but it seems to be more focused towards people who already know what configurations do.\nI'm assuming it is used to set up my localhost, however I'm unsure. Any help would be greatly appreciated!","AnswerCount":4,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":99,"Q_Id":57863683,"Users Score":0,"Answer":"How I config Run\/Debug Configurations in Pycharm Community:\n\nAdd a Python Configuration\nScript path: \"path to manage.py\"\nParameters: runserver \"host\":\"port\" \"option like '--noreload', '--nothreading'\"\nPython interpreter: \"path to venv\"\n\nNow you are able to run with Shift + F10","Q_Score":3,"Tags":"python,django,configuration,pycharm","A_Id":57863945,"CreationDate":"2019-09-10T03:31:00.000","Title":"What are Django configurations?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to start my new Django project on my server. so i install cpanel. but in software part, there is nothing related to python.\nShould i Do something in WHM? or install something in my server?\nthanks for helping me.","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":3378,"Q_Id":57868008,"Users Score":1,"Answer":"python app (django & flask) are available on cpanel only if CloudLinux is installed , so you have to install a CloudLinux on your server and then try to setup a python app using cpanel interface .","Q_Score":0,"Tags":"python,django,cpanel,whm","A_Id":63349203,"CreationDate":"2019-09-10T09:38:00.000","Title":"How to enable setup python app on cpanel?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to start my new Django project on my server. so i install cpanel. but in software part, there is nothing related to python.\nShould i Do something in WHM? or install something in my server?\nthanks for helping me.","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":3378,"Q_Id":57868008,"Users Score":1,"Answer":"You must upgrade your OS to Cloudlinux then you will have that feature.\nWhen you have Cloudlinux installed, you will have an option in WHM called \"Live Manager\" where you can activate Python.","Q_Score":0,"Tags":"python,django,cpanel,whm","A_Id":64323074,"CreationDate":"2019-09-10T09:38:00.000","Title":"How to enable setup python app on cpanel?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We have set up a bokeh server in our institute, which works properly. We also have a python-based code to analyse fMRI data which at the moment uses matplotlib to plot and save. But I want to transfer the code to bokeh server and allow everybody to upload files into the server from the client and when the analysis is done in the server, save the output plots in their local HDD. This transfer file procedure seems to be lacking in bokeh atm. I saw a new feature recently added in github to upload json files, but my problem is fMRI files come in various formats, and asking (not necessarily tech-savvy) users to convert the files into a certain format beats the purpose. Also, I do not know any JS or the like, hence I do not know what solutions people usually use for such web-based applications. \nIf anybody has any solutions to get around this issue, it'd be happy to hear it. Even if it is a solution independent of bokeh (which would mean users need to open a separate page to upload the files, a page to run the analysis, and a page to save the output) please let me know. It won't be ideal, but at least better than no solution, which is the case in bokeh right now. Thanks!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":184,"Q_Id":57868893,"Users Score":1,"Answer":"I'm not sure where you are getting your information. The FileInput widget added in Bokeh 1.3.0 can upload any file the user chooses, not just JSON.","Q_Score":0,"Tags":"javascript,python,webserver,bokeh,bokehjs","A_Id":57882320,"CreationDate":"2019-09-10T10:29:00.000","Title":"Uploading a file from client to server in python bokeh","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Say I have an app called polls.\nWhat is the difference between including an app in INSTALLED_APPS like this 'polls.apps.PollsConfig' and just specifying the app's name ( 'polls')?\nThe official Django tutorial recommends the former.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":54,"Q_Id":57875834,"Users Score":2,"Answer":"The latter is the old way and it has got problems in some cases with the position in INSTALLED_APPS as the preferred way has been to put your apps the last, so all your dependencies are already available when your app is loaded. \nThe former is the new improved way when you load your app configuration instance first and so all the dependencies are aware of your app and also your app prior to loading has got all the dependencies available.\nYou should use AppConfig and put it at the top of the list, plain app positioned last is relict of the past.","Q_Score":0,"Tags":"python,django","A_Id":57876063,"CreationDate":"2019-09-10T17:37:00.000","Title":"Two ways of including an app in INSTALLED_APPS","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a long-running Apache Beam batch analysis process on Google Cloud Dataflow that failed partway through.  To save time and cost, is it possible to update my code to handle the failure, and re-run from the failure point using cached intermediate checkpoints?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":450,"Q_Id":57879396,"Users Score":1,"Answer":"Dataflow batch pipelines discard all intermediate results when the pipeline terminates (successfully or fails).\nCurrently you would need to add points within the pipeline where the intermediate data is materialized and then on failure you could launch a new pipeline which is a subset of your existing pipeline that reads the intermediate results and continues processing.","Q_Score":0,"Tags":"python,google-cloud-dataflow,apache-beam","A_Id":57915380,"CreationDate":"2019-09-10T23:43:00.000","Title":"Can an Apache Beam batch process be restarted from a checkpoint?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a problem where user chooses a month and on the basis of that i have to choose starting and ending date of that month.(e.g -> If user chooses January the output should come 01\/01\/2019 and 31\/01\/2019)\nI am able to fetch the current months starting and ending date by using postgresql query.\nThis gives current months starting date - \n @api.model\n    def get_start_date(self):\n        self.env.cr.execute(\"\"\" select date(date_trunc('month', \n                                               current_date));\"\"\")\n        first_date = self.env.cr.dictfetchall()\n        for f in first_date:\n            first_new_date = f['date']\n            return first_new_date\nThis gives ending date -\n@api.model\n    def get_end_date(self):\n        self.env.cr.execute(\"\"\" select date(date_trunc('month', \n                   current_date) + interval '1 month - 1 day'); \"\"\")\n        end_date = self.env.cr.dictfetchall()\n        for f in end_date:\n            end_last_date = f['date']\n            return end_last_date\nI want if user select January for selection field it should give January's starting and ending date.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":97,"Q_Id":57917255,"Users Score":0,"Answer":"if you want to store that data in db use store=True: \noutput_field = fields.Char(compute='_get_data', store=True) (or fields.Data)\nand then use onchange method:\n@api.onchange('selection_field_name')\ndef _get_data(self):\n    if self.selection_field_name:\n        self.output_field = **do some calculations**","Q_Score":0,"Tags":"python-3.x,postgresql,odoo-11","A_Id":57925859,"CreationDate":"2019-09-13T04:22:00.000","Title":"I need to fetch months starting date and ending date on the basis of the month chosen by the user in odoo","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am currently developing a SPA application (angular) with a Python\/Flask API in the back-end.\nThe application will support multiple tenants and I struggle a bit with the security concept. I am currently using jwt-extended\nAn issued JWT token would be valid for all tenants (I can of course get the user form the token and then check if the user should have access or not to that tenant), but I would perfere to have JWT token that are tenant specific (so that the user get blocked by the @jwt_required).\nMy idea would be to have different JWT_SECRET_KEY per tenant (so like append the tenant to my key) and then check the validity of the token per tenant (tenant would be identified by the url, either as subdomain or as parameter)\nBy default,  the key is the on the app level (with app.config('JWT_SECRET_KEY') but it looks like you can overwrite the key encode\/decode functions in flask_jwt_extended.JWTManager. I am however not sure which functions I have to override for my @jwt_required to work a I would like (so to use a custoim key in the decoding that would be generated as a concatenate of my key + tenant)\nIf my concept does not make sense \/ if there is a better and\/or simpler way to achieve this, please let me know.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":569,"Q_Id":57918365,"Users Score":0,"Answer":"He u just put the tenants I'd in user table for specifying the user per tenants then you needs to puts all the details in jwt after that in angular side you can get the user details and also tenants details from jwt token for accessing specific tenants per user to secure the endpoint.","Q_Score":2,"Tags":"python,flask,jwt,multi-tenant,flask-jwt-extended","A_Id":57924904,"CreationDate":"2019-09-13T06:30:00.000","Title":"Is there a way to have tenant specific JWT token","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"According to performance it is more than obvious that web scraping with BautifulSoup is much faster than using a webdriver with Selenium. However I don't know any other way to get content from a dynamic web page. I thought the difference comes from the time needed for the browser to load elements but it is definitely more than that. Once the browser loads the page(5 seconds) all I had to do is to extract some <tr> tags from a table. It took about 3-4 minutes to extract 1016 records which is extremely slow in my opinion. I came to a conclusion that webdriver methods for finding elements such as find_elements_by_name are slow. Is find_elements_by.. from webdriver much slower than the find method in BeautifulSoup? And would it be faster if I get the whole html from the webdriver browser and then parse it with lxml and use the BeautifulSoup?","AnswerCount":4,"Available Count":1,"Score":0.049958375,"is_accepted":false,"ViewCount":1214,"Q_Id":57938852,"Users Score":1,"Answer":"Look into 2 options:\n1) sometimes these dynamic pages do actually have the data within <script> tags in a valid json format. You can use requests to get the html, beautifulsoup will get the <script> tag, then you can use json,loads() to parse.\n2) go directly to the source. Look at the dev tools and search the XHR to see if you can go directly to the url\/API and that generates the data and return the data that way (most likely again in json format). In my opinion, this is by far the better\/faster option if available.\nIf you can provide the url, I can check to see if either of these options apply to your situation.","Q_Score":0,"Tags":"python,performance,selenium,web-scraping,beautifulsoup","A_Id":57942694,"CreationDate":"2019-09-14T20:02:00.000","Title":"Web Scraping with Python Selenium performance","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to use pyaudio to record some speech but I can't seem to figure out how to record anything on a Mac running Mojave. I think that you have to allow access to the microphone on a mac but I'm not sure how.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2425,"Q_Id":57940639,"Users Score":0,"Answer":"For those who use PyCharm as their IDE, you follow these steps:\n\nRun your microphone-using python script in Terminal (as @Yongke suggested)\nOnce prompted, allow Terminal to access Microphone\nClose running PyCharm instances\nOpen PyCharm from terminal\n\ncd \/Applications\/PyCharm\\ CE.app\/Contents\/MacOS\/\n.\/pycharm\n\nNow your recording app should work\n\nFurther explaination\nEvery App running on recent macOS versions needs explicit permissions to use the microphone. PyCharm doesn't request these permissions upon usage, i.e. when you run your script trying to record, and you cannot manually add a program to Mac's Microphone white-listed apps. This means you cannot access the microphone via PyCharm unless you run it within a white-listed app such as Terminal.","Q_Score":4,"Tags":"python,macos,microphone,pyaudio","A_Id":66210338,"CreationDate":"2019-09-15T02:15:00.000","Title":"Cannot Access Microphone on Mac Mojave using pyaudio","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to build REST API (or GraphQL API) which I want to connect with Angular (2+) to build some nice web application.\nWhich framework should I choose to get started with and why? DjangoREST or ExpressJS ?\nWhich one of them is easier to get connected with front-end frameworks?\nI know python as well as JavaScript. I also have experience with django as well as some JavaScript front-end frameworks like Angular. So, it wouldn't be that difficult to get started with nodejs or either of them.\nWhich of then is easier and better?","AnswerCount":1,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":11553,"Q_Id":57945868,"Users Score":20,"Answer":"In short, Django for quick development and Express for full-stack,\n  scalable solutions.\n\n\nDjango provides better, easier security without as much experience. In the case of Express, it takes so much experience and confidence to get the same security from Node.JS\nDjango uses the MVT (Model View Template) design pattern and Express uses event-driven programming in which the entire architecture is driven by \u201cevents\u201d or user choices. MVT is excellent for server-side development, on the other hand, event-driven programming is rather than separating client and server sides.\nDjango uses an in-house template system, so you won't hang to choosing the right one. With Express, a fully open system you may spend a lot amount of time to choose the perfect one for you.\nDjango is more structured to work around. It tells you how to do whereas express gives you the flexibility to do it in your way. For example, you need to use Django's ORM to interact with the database, but in the case of Express, you can choose any tool you like.\nExpress gives you freedom. So, if you\u2019re experienced, there is a space to create whatever you want from scratch. Django gives you a lot of solutions with a vast template and library system, which is great for productivity but not enough for the vision.","Q_Score":7,"Tags":"python,node.js,django,express,django-rest-framework","A_Id":57946706,"CreationDate":"2019-09-15T16:06:00.000","Title":"DjangoREST vs ExpressJS , which 1 should I choose to build REST API?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"As a training project i have made  activity tracker using  python (no GUI, only command-line). \nScript checks with win32gui\/pywin32 and pyautogui what program is currently used, and if it is web browser what web site is in use. \nName of window, date, and amount of time spent on program\/website is stored in sqlite3 database. \nThen with help of pandas module same names are grouped and time is summed up. \nI want to convert this script into web app using django but i am beginner in creating web apps, so i am wondering: is it possible to use this modules within django and is it even possible to create web app that works same as script mentioned earlier?\nSorry if the question is trivial. I will be grateful for every tip where and what exactly to look for in this topic.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":129,"Q_Id":57964611,"Users Score":1,"Answer":"Nope.\nYou can't make a server to connect through a web client\/browser and see the other processes. That's a security issue, a big one.\nBtw, some GNU\/Linux desktop environments won't even allow the same user's processes in the same logged-in session on the same computer to see each other (Wayland).","Q_Score":0,"Tags":"python,django,pandas,pywin32,pyautogui","A_Id":57965022,"CreationDate":"2019-09-16T21:25:00.000","Title":"Is it possible to get access to PC system via web app using modules like pyautogui and win32gui\/pywin32?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a module with a controller and I need to inherit it in a newly created module for some customization. I searched about the controller inheritance in Odoo and I found that we can inherit Odoo's base modules' controllers this way:\nfrom odoo.addons.portal.controllers.portal import CustomerPortal, pager as portal_pager, get_records_pager\nbut how can I do this for a third party module's controller? In my case, the third party module directory is one step back from my own module's directory. If I should import the class of a third party module controller, how should I do it?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":455,"Q_Id":57968188,"Users Score":3,"Answer":"It is not a problem whether you are using a custom module.If the module installed in the database you can import as from odoo.addons. \nEg : from odoo.addons.your_module.controllers.main import MyClass","Q_Score":1,"Tags":"python,odoo,web-controls,odoo-12","A_Id":57971645,"CreationDate":"2019-09-17T06:03:00.000","Title":"How to inherit controller of a third party module for customization Odoo 12?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"my project use angular + python flask\n(1) \nIs it possible to give each router called a unique id ?\n(2) if a flask router processing is too long, \nis it possible to stop this router without stopping the flask when i click some button on the web??\ni need to stop only this router.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":56,"Q_Id":57988486,"Users Score":0,"Answer":"(2) You can respond with 504 timeout gateway.","Q_Score":0,"Tags":"python,flask","A_Id":57988901,"CreationDate":"2019-09-18T08:38:00.000","Title":"Can I stop a specific flask router?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it possible to have django projects(python3) directory outside of the environment directory? e.g I want to have my projects under \/Users\/me\/Documents\/dev\/myDjangoProject and environment under \/Users\/me\/Documents\/env\/myCustomEnvironment and somehow link them together. Thanks in advance","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":40,"Q_Id":57991211,"Users Score":0,"Answer":"Ok. I found solution. \n\nFrom my terminal window I moved into my project directory - \/Users\/me\/Documents\/dev\/myDjangoProject \nActivated virtualenv from its absolute path - source \/Users\/me\/Documents\/env\/myCustomEnvironment\/bin\/activate\nAnd then ran server python manage.py runserver","Q_Score":1,"Tags":"django,python-3.x","A_Id":57995066,"CreationDate":"2019-09-18T10:59:00.000","Title":"Python3\/Django. Separate project directory from environment directory","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on upgrading a Django website from Django 1.8 to Django 2.2 and have come across a problem when trying to delete an object from the Django admin changelist view. When I try to delete an object, I am shown a screen with the words \"Deleting the selected Records would result in deleting related objects, but your account doesn't have permission to delete the following types of objects\". The problem is, I am a superuser and should have permission to delete any object I want, or so I thought. \nI have read a decent amount of documentation on Django upgrades and permissions of superusers, however I haven't stumbled across anything that helps me (I could be missing something though). I have tried creating a new superuser just in case, still the same message occurs though. Anyway, Does anyone have any idea why this could be happening?\nNote: I can't show any code because I am working for a company and I signed an NDA. Just some help pointing me in the right direction would be appreciated.","AnswerCount":2,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":2356,"Q_Id":57996905,"Users Score":11,"Answer":"For anyone else who stumbles across this problem, dirkgroten was right and it turns out the has_delete_permission was overridden! Thanks for your help dirkgroten!","Q_Score":10,"Tags":"python,django,model,permissions,superuser","A_Id":57997632,"CreationDate":"2019-09-18T16:11:00.000","Title":"Django superuser doesn't have permission to delete models","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working on a project with flask and python in pycharm. My css will not do anything, even really basic things. When I go to the network tab and refresh, I get a 200 message for the CSS file, so I know my link works. Problem is, nothing changes. Also whatever port I'm running on, if I change and save the CSS and open it through dev tools, it doesn't update unless I change to a new port. Any ideas why no CSS is running but I get a 200? Or why I have to change ports to update CSS? Thanks!","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":918,"Q_Id":58002090,"Users Score":0,"Answer":"Browsers cache CSS properties usually. Try hard reloading when you change something. For chrome, you can use ctrl+shift+R.","Q_Score":0,"Tags":"python,flask,pycharm","A_Id":58023893,"CreationDate":"2019-09-19T00:05:00.000","Title":"Pycharm Flask CSS not changing anything but getting a 200 status","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working on a project with flask and python in pycharm. My css will not do anything, even really basic things. When I go to the network tab and refresh, I get a 200 message for the CSS file, so I know my link works. Problem is, nothing changes. Also whatever port I'm running on, if I change and save the CSS and open it through dev tools, it doesn't update unless I change to a new port. Any ideas why no CSS is running but I get a 200? Or why I have to change ports to update CSS? Thanks!","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":918,"Q_Id":58002090,"Users Score":0,"Answer":"You could either hard reload the browser tab after clearing the cache or try opening the URL in incognito mode. If it works in incognito mode, then its a caching issue.","Q_Score":0,"Tags":"python,flask,pycharm","A_Id":58676980,"CreationDate":"2019-09-19T00:05:00.000","Title":"Pycharm Flask CSS not changing anything but getting a 200 status","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using Celery with a RabbitMQ server. I have a publisher, which could potentially be terminated by a SIGKILL and since this signal cannot be watched, I cannot revoke the tasks. What would be a common approach to revoke the tasks where the publisher is not alive anymore?\nI experimented with an interval on the worker side, but the publisher is obviously not registered as a worker, so I don't know how I can detect a timeout","AnswerCount":3,"Available Count":2,"Score":1.0,"is_accepted":false,"ViewCount":152,"Q_Id":58017144,"Users Score":6,"Answer":"There's nothing built-in to celery to monitor the producer \/ publisher status -- only the worker \/ consumer status.  There are other alternatives that you can consider, for example by using a redis expiring key that has to be updated periodically by the publisher that can serve as a proxy for whether a publisher is alive.  And then in the task checking to see if the flag for a publisher still exists within redis, and if it doesn't the task returns doing nothing.","Q_Score":8,"Tags":"python,rabbitmq,celery","A_Id":58053094,"CreationDate":"2019-09-19T18:35:00.000","Title":"Tasks linger in celery amqp when publisher is terminated","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am using Celery with a RabbitMQ server. I have a publisher, which could potentially be terminated by a SIGKILL and since this signal cannot be watched, I cannot revoke the tasks. What would be a common approach to revoke the tasks where the publisher is not alive anymore?\nI experimented with an interval on the worker side, but the publisher is obviously not registered as a worker, so I don't know how I can detect a timeout","AnswerCount":3,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":152,"Q_Id":58017144,"Users Score":4,"Answer":"Another solution, which works in my case, is to add the next task only if the current processed ones are finished. In this case the queue doesn't fill up.","Q_Score":8,"Tags":"python,rabbitmq,celery","A_Id":58107564,"CreationDate":"2019-09-19T18:35:00.000","Title":"Tasks linger in celery amqp when publisher is terminated","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I run Django 1.11.20. I have just (finally) made the jump from Python 2.7 to 3.7.\nI've noticed that since upgrading to Python 3, the very first page load after clearing the cache is very slow. So far I only have my Python 3 environment on my development machine, so I'm experiencing this when using .\/manage.py runserver and the FileBasedCache backend. I don't know if I will experience the same thing on a production stack (nginx, uwsgi, redis, etc).\nI'm using Django Debug Toolbar, which gives me some hints as to what the problem isn't, but I'm not sure where I should look to see what the problem is.\nThe times given by the debug toolbar run loading a simple page with an empty cache in the Python 2.7 environment on my development machine are:\n\nCPU: 4877.89ms\nSQL 462.41ms\nCache: 1154.54ms\n\nThe times given by the debug toolbar run loading the same page with an empty cache in the Python 3.7 environment on my development machine are:\n\nCPU: 91661.71ms\nSQL 350.44ms\nCache: 609.65ms\n\n(I'm using the file based caching on this development machine, so when I say \"with an empty cache\" I just mean that I rm -r cache before loading the URL in my browser.)\nSo the SQL and Cache times got slightly faster with the upgrade, but the CPU time doubled. When I open the \"Time\" panel in the debug toolbar I see that the \"timing attribute\" that increased is \"request\".\nThis same thing happens on every page (including pages that are just HTML generated by TemplateView, so they're not doing anything tricky), but only when it is first loaded from an empty cache. After that very first response, all pages are back to about the same response time as in the Python 2 environment. So it is something to do with the initial request.\nI'm not sure where to look to try to figure out what Django is doing only on the very first request. Any pointers? Or is there something obvious that I can expect to be slower in the jump from Python 2.7 to 3.7?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":508,"Q_Id":58018939,"Users Score":2,"Answer":"I was finally able to trace this problem back to the Django Debug Toolbar itself, which was bumped from 1.11 to 2.0 during my Python 3 upgrade. Specifically, the toolbar's SQL panel was causing the slowdown. I have a context processor which executes a query if a cached object does not exist. The query itself is fast, but for some reason Django Debug Toolbar 2.0 is extremely slow generating the stacktrace for it. I have not figured out what changed between 1.11 and 2.0 to cause this terrible performance loss, but now that I know where the problem lies I can work around it.","Q_Score":0,"Tags":"python,django,python-3.7,django-debug-toolbar","A_Id":58033120,"CreationDate":"2019-09-19T21:07:00.000","Title":"Django Initial Page Load Slow After Python 2 to 3 Upgrade","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I pulled the new code from GitHub and my colleagues changed the type of a field in a Django model from TextField to JSONField. After running python manage.py makemigrations and python manage.py migrate the type of the field was changed in the database (I suppose). I needed to reverse back to previous migration and somehow the type of the field was not reversed. How could I fix the issue? Why reversing back migration does not revert back the field type?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":134,"Q_Id":58035648,"Users Score":1,"Answer":"Change the field type back to a TextField, then run python manage.py makemigrations and python manage.py migrate again. If the migration still exists in your django project, it will look at its dependencies, which most likely still links to the migration that turned it into a JSONField. So simply doing the exact same thing to turn it back into a TextField should work","Q_Score":0,"Tags":"python,django","A_Id":58036574,"CreationDate":"2019-09-20T22:08:00.000","Title":"Reverse back Postgres field type when migrations were applied in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"The Divio Django CMS offers two servers: TEST and LIVE. Are these also two separate repositories? Or how is this done in the background?\nI'm wondering because I would have the feeling the LIVE server is its own repository that just pulls from the TEST whenever I press deploy. Is that correct?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":58,"Q_Id":58038110,"Users Score":1,"Answer":"All Divio projects (django CMS, Python, PHP, whatever) have a Live and Test environment.\nBy default, both build the project from its repository's master branch (in older projects, develop). \nOn request, custom tracking branches can be enabled, so that the Live and Test environments will build from separate branches.\nWhen a build successfully completes, the Docker image can be reused until changes are made to the project's repository. This means that after a successful deployment on Test, the Docker image doesn't need to be rebuilt, and the Live environment can be deployed much faster from the pre-built image. (Obviously this is only possible when they are on the same branch.)","Q_Score":1,"Tags":"python,django,divio","A_Id":58041679,"CreationDate":"2019-09-21T07:16:00.000","Title":"Setup of the Divio CMS Repositories","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Example: db.init_app(app)\nWhat is purpose of init_app function in Flask? Is this like any other method?","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":5455,"Q_Id":58042067,"Users Score":0,"Answer":"It is used to control the integration of a package to one or more Flask applications. Depending on how you initialize the object it is usable right away or will attach as needed to a Flask application. \nIn the case of db.init_app(app) the app is your flask application,the object must have been created initially.","Q_Score":5,"Tags":"python-3.x,flask","A_Id":58048054,"CreationDate":"2019-09-21T16:20:00.000","Title":"What is purpose of init_app function in Flask?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Example: db.init_app(app)\nWhat is purpose of init_app function in Flask? Is this like any other method?","AnswerCount":3,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":5455,"Q_Id":58042067,"Users Score":7,"Answer":"A number of packages provide an init_app() method. It's a way of constructing an instance of the particular package, then letting it know about the Flask instance (e.g., so that configuration details can be copied). Mechanically, it's just like any other instance method.","Q_Score":5,"Tags":"python-3.x,flask","A_Id":58042133,"CreationDate":"2019-09-21T16:20:00.000","Title":"What is purpose of init_app function in Flask?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am getting this warning email from PythonAnywhere on every single request to my website. I am using spaCy and Django and have just upgraded my account. Everything seems to work fine, though. Except I am receiving warning emails, that is. I have only 2 GB RAM on my local machine and it can run my app along with a few other apps too without any issues. Then why is 3 GB RAM not enough on PythonAnywhere? (I also have 3 GB disc space on PythonAnywhere, of which only 27% is used up.)\nI have tried searching for the answers on their forum and on the internet in general but I have not got any clue about the issue.","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":208,"Q_Id":58049025,"Users Score":2,"Answer":"If your initial requests on the PythonAnywhere webapp works fine (ie. your code successfully allocates say 2GB RAM and returns a result), and you see the results correctly, but you receive emails about processes exceeding the RAM limit, then perhaps you have processes that are left hanging around, not cleaned up, and they are accumulating until they slowly get killed? Can you correspond this with the # of kill messages you get vs the number of times you hit the webapp and get a result? My theory would be corroborated if there are significantly less kill messages vs the hits for that particular model endpoint.","Q_Score":0,"Tags":"python,django,spacy,pythonanywhere","A_Id":58102652,"CreationDate":"2019-09-22T12:02:00.000","Title":"PythonAnywhere Issue: Your processes have been killed because a process exceeded RAM Limit","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Python and Flask, served by Waitress, to host a POST API. I'm calling the API from a C# program that posts data and gets a string response. At least 95% of the time, it works fine, but sometimes the C# program reports an error: \n(500) Internal Server Error.\nThere is no further description of the error or why it occurs. The only clue is that it usually happens in clusters -- when the error occurs once, it likely occurs several times in a row. Without any intervention, it then goes back to running normally.\nSince the error is so rare, it is hard to troubleshoot. Any ideas as to how to debug or get more information? Is there error handling I can do from either the C# side or the Flask\/Waitress side?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2806,"Q_Id":58049827,"Users Score":0,"Answer":"Your flask application should be logging the exception when it occurs. Aside from combing through your logs (which should be stored somewhere centrally) you could consider something like Sentry.io, which is pretty easy to setup with Flask apps.","Q_Score":6,"Tags":"c#,python,flask,waitress","A_Id":58050151,"CreationDate":"2019-09-22T13:48:00.000","Title":"How to debug (500) Internal Server Error on Python Waitress server?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am unsure of what code you guys would want me to upload, but please ask away if you need any and I will upload it!\nWhen a user uploads media\/files to my website, the root user becomes the owner of the file. This prevents the user from being able to open and view the media they uploaded, because it is not owned by the proper user on my server.\nI have a user that runs my Django application instead of the root user. The person who uploaded the media can access it once I manually go into the server and change the ownership to that media file that was uploaded, to the server user which runs my Django application.\nHow can I get this to, by default, upload the file to the ownership of the server user running Django??\nI was thinking of setting up a cron job to run every-so-often (this would be terrible for scaling) so I can change the ownership of the media without having to physically going in the server and do it myself.\nEdit\nI want to clarify. \nA user is someone who has created a profile on my website. They go on their profile and upload a file or an image to my server and it is stored under the media_root using a form submission. \nMy server is running Django, and django_user is the owner of Django and it\u2019s files. However, when a user uploads a file\/photo using the form submission, it is placed under the ownership of my servers root user. \nI need the ownership to be under django_user so that site users can see their uploads without me having to manually change the file owner to django_user. Right now, they are getting a permission error because root is not who is serving up Django. \nNOTE: django_user is the one running Django. This didn't seem clear.\nTemporary Solution:\nA temporary solution comes in the form of ErikR's answer. It is not what I was looking for, but it does help me out a little. His solution allows users to view their photo\/file they've uploaded without having to wait for me to change the owner\/permissions.\nHowever, it does still cause files to be uploaded as root. But it is a temporary workaround for the permissions issue, NOT the owner issue.\nHis answer (place in base settings): FILE_UPLOAD_PERMISSIONS = 0o644","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":217,"Q_Id":58070466,"Users Score":0,"Answer":"My server is running Django, and django_user is the owner of Django and it\u2019s files. However, when a user uploads a file\/photo using the form submission, it is placed under the ownership of my servers root user. \n\nIf Django is really running as django_user, then it cannot create files owned by root, and it cannot change the ownership or permissions of files owned by root.\nTherefore, we must assume that your \"form submission\" must be implemented by something other than Django.  Possibly it is the host webserver ... though that shouldn't be running as root either.\nThere are two ways you could address this:\n\nYou could change the code that is implementing the form (as root) to change the ownership of files after they are uploaded.  \nYou change your system's architecture so that the form us run as the django_user user.\n\n\nIf the form is actually implemented in Django, then that is evidence that Django is not running as django_user.","Q_Score":0,"Tags":"python,django,unix","A_Id":58082741,"CreationDate":"2019-09-23T21:32:00.000","Title":"Django: When a user uploads media to my site, it is owned by the server's root user. How do I change this?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to achieve all these together:\nA. New users can sign up with or without using facebook.\nB. They will all be presented with a form to fill out additional user information as part of the sign up flow.\nC. New accounts will by default be inactive. Admins will need the additional user information when they manually activate (or delete) accounts.\n\nI achieved A using django-allauth social accounts.\nI achieved C by adding a listener to django.db.models.signals.pre_save and setting user.active = False\nI partly achieved B by defining a custom ACCOUNT_SIGNUP_FORM_CLASS in settings.py. However this only works for local \"non-social\" accounts as far as I can tell, since social logins seem to skip this form.\nMy problem is that when someone signs up with an allauth social account they don't have the chance to provide additional information since their account will be created without first displaying my custom sign up form.\nFurthermore since all new accounts are automatically saved as inactive and that additional information is needed in order for admins to activate them I can't simply add that form to a \"first time login flow\" (note: it's not possible to log in to inactive accounts).\nOne way to solve this I guess would be to not automatically save accounts as inactive but instead work with permissions but I'd rather not rewrite all my views etc. if I can avoid it.\nAny input would be appreciated! Thanks!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":113,"Q_Id":58071733,"Users Score":2,"Answer":"Add this option to your settings.py file:\nSOCIALACCOUNT_AUTO_SIGNUP = False","Q_Score":1,"Tags":"python,django,facebook,django-allauth","A_Id":58260342,"CreationDate":"2019-09-24T00:50:00.000","Title":"How to display custom form in django-allauth's social account sign up flow","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a small doubt. Is there any way to use a pfx or p12 container with gunicorn?\nI'm developing a python app that contains 2 api endpoints which are served using gunicorn and falcon. I want to support ssl but using pfx to set the keys and CA. Is there any way to do this?\nThanks!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":208,"Q_Id":58081164,"Users Score":0,"Answer":"Gunicorn needs a cert file and a key file. You can extract these from the pfx file. Make sure your key file is unencrypted else , you might have to enter the password while deployment","Q_Score":0,"Tags":"python,ssl,gunicorn","A_Id":60513632,"CreationDate":"2019-09-24T13:14:00.000","Title":"Usage of pfx file in gunicorn","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an existing django project and need to create an instance of it in a new environment with new database. I have the database connection configured in the settings file. The schema does not exist. If I run the manage.py migrate command, does it also create the schema? It looks like it assumes the schema already exists because I am getting an error django.db.utils.OperationalError: (1049, \"Unknown database 'my_db'\"). Just wondering if I have to create the database first or if some django command is available to create it if it does not exists.\nI can create the schema manually via sql script if it's not doable via python django command.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":746,"Q_Id":58103427,"Users Score":1,"Answer":"As already pointed out in the comments to your question, the missing database is the problem, not the schema. You have to create the database first, which might involve setting the user permissions for the new database. After that, the manage.py migrate command will work just fine and create the schema for you.","Q_Score":1,"Tags":"python,mysql,django","A_Id":58107976,"CreationDate":"2019-09-25T17:07:00.000","Title":"Does django manage.py migrate command creates database\/schema if not exists?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am running quite a time consuming python code in PyCharm, where data is initially loaded, then a model is created etc. \nI would like to know if it is possible to set a breakpoint at a particular point in the code where the state of the environment will be saved. From there on I want to make edits to the rest of the code, however ideally re-run from the breakpoint I set. \nBy doing this I would avoid the loading of data, and model training which would be a repeated process. \nIs this possible in Python or is there such a functionality in PyCharm?\nThanks","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":345,"Q_Id":58112446,"Users Score":0,"Answer":"One option I have found is to convert your code to ipython notebook. Put all the heavy-weight\/one-time run code in the first few cells and unstable\/to be debugged code in the later cells.\nNow, you run the first few cells one time, so the output from these cells is stored and readily available always for later cells. Whenever you change code in later cells, you only have to run those cells (unless you modified something in the earlier cells in which case you need to rerun those cells as well).\nPycharm\/most python IDEs support running and debugging ipython notebook cells (individually or in groups).","Q_Score":3,"Tags":"python,debugging,pycharm","A_Id":69474304,"CreationDate":"2019-09-26T08:18:00.000","Title":"Re-run code from certain point onwards in PyCharm","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using dht22 sensor and arduino uno. I am able to get the output of the serial reading and I have communicated it with python through pyserial. So now, my sensor data are appearing on python. I have also created an HTML gui of a thermometer which displays random data. NOW THE PROBLEM IS, I CAN'T FIGURE OUT HOW TO COMMUNICATE MY PYTHON TO THE HTML FILE. Any help would be appreciated.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":222,"Q_Id":58112600,"Users Score":1,"Answer":"Due to security reasons with browsers, this is supposedly impossible without any frameworks... But try flask as mentioned above, should get your project up and going!","Q_Score":1,"Tags":"html,python-3.x,arduino","A_Id":58114257,"CreationDate":"2019-09-26T08:29:00.000","Title":"How to input data from arduino serial monitor to html file?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"i am able to see below path created in my html report , i am able to open this path from html when it is a local job , but when i run in jenkins ,this link wont work , i am able to see metadata have url and workspace info , can i use this meta data to generate proper links in html file , so that i will be able to open them from jenkins page .  \n\nhref=\"file:\/\/\/space\/scratch\/jenkins\/navarro\/workspace\/coverage_regression\/dut\/python\/.simtest\/NavarroSimTestSystem\/default\/TestJaxi\/test_py_jaxi_read_version_reg_ss\/TestJaxi.test_py_jaxi_read_version_reg_ss-2458081572_simulate.log\" type=\"text\/plain\">TestJaxi.test_py_jaxi_read_version_reg_ss-2458081572_simulate.log","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1119,"Q_Id":58124694,"Users Score":0,"Answer":"Are you trying to show test results in Jenkins job? I have found it easier to generate junit.xml using --junitxml switch and point Jenkins to the Junit XML path. It shows all test results data. Or have you tried the 'html-publisher-plugin'.","Q_Score":0,"Tags":"python,jenkins,jenkins-pipeline,pytest","A_Id":58132551,"CreationDate":"2019-09-26T20:57:00.000","Title":"Pytest : How to update jenkins url in pytest html report instead of local path","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I saw lots of information about using multiple databases with one server but I wasn't able to find contents about sharing one database with multiple servers.\nUsing Micro Service Architectures, If I define a database and models in a django server, named Account, How can I use the database and models in Account server from another server named like Post??\nWhat I'm thinking is to write same models.py in both servers and use the django commands --fake\nThen, type these commands\npython manage.py makemigrations\npython manage.py migrate\nand in another server\npython manage.py makemigrations\npython manage.py migrate --fake\nI'm not sure if this would work and I wonder whether there is any good ways.","AnswerCount":3,"Available Count":1,"Score":0.2605204458,"is_accepted":false,"ViewCount":2031,"Q_Id":58126278,"Users Score":4,"Answer":"I doubt this is the best approach, but if you want two separate Django projects to use the same database you could probably create the first like normal then, in the second project, copy over all of the models.py and migration files. Django creates a database table behind the scenes to track which migrations have been applied, so as long as the apps, models, and migration files are identical in the second app it should work without having to fake any migrations.\nThat said, this sounds like a mess to maintain going forward. I think what I would do is create a single Django project that talks to the database, then create an API in that first project that all other apps can interface with to communicate with the database. That way you avoid duplicating code or having to worry about keeping multiple projects in sync.","Q_Score":5,"Tags":"python,django","A_Id":58126737,"CreationDate":"2019-09-27T00:27:00.000","Title":"How can I use one database with multiple django servers?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In my Item Pipeline to add data in database, during processing an item, connection to server can drop randomly and I need to re-establish connection. \nNow in the open_connection function, do I need to make sure that only one thread will create a new connection and all the concurrent request wont start creating a new connection ?\nAs scrapy is single threaded, I guess I would not need any locks in this scenario as one thread would re-establish connection and all the next incoming callback to process_item function would have an established connection.\nIf this is wrong, can I use all usual Python locks with scrapy?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":327,"Q_Id":58151391,"Users Score":2,"Answer":"Scrapy is not single threaded but you still do not need locks.\nInternally scrapy engine can launch multiple requests to the target server at once, but it maintains the order\/sequence of the all the internal threads making it seemingly single threaded to the user.\nSo yes you will not need any locks because at any time only 1 thread would be allowed to process the pipeline.","Q_Score":4,"Tags":"python,python-3.x,scrapy","A_Id":67714866,"CreationDate":"2019-09-29T01:02:00.000","Title":"Can we use locks in Scrapy? Are they ever required as Scrapy is single threaded?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In my Item Pipeline to add data in database, during processing an item, connection to server can drop randomly and I need to re-establish connection. \nNow in the open_connection function, do I need to make sure that only one thread will create a new connection and all the concurrent request wont start creating a new connection ?\nAs scrapy is single threaded, I guess I would not need any locks in this scenario as one thread would re-establish connection and all the next incoming callback to process_item function would have an established connection.\nIf this is wrong, can I use all usual Python locks with scrapy?","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":327,"Q_Id":58151391,"Users Score":1,"Answer":"You don't need a lock since there only one thread writing to the database. However, I recommend you to have progress constantly being saved in case of random failures.\nFor the persistence part, you want to use a buffer to save the documents in batches to minimize database workload and total round-trip-time.","Q_Score":4,"Tags":"python,python-3.x,scrapy","A_Id":58154949,"CreationDate":"2019-09-29T01:02:00.000","Title":"Can we use locks in Scrapy? Are they ever required as Scrapy is single threaded?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"If I install django on local system, then that django, if I access in virtual environment, will that be accessible, or I have to install django again in VirtualEnvironment?","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":219,"Q_Id":58157047,"Users Score":0,"Answer":"Any virtual environment starts out essentially blank, with no packages installed, so you will have to install Django again in the environment.\nPart of the reasoning for this is because if you install something with pip outside of a virtual environment, there's a chance that another python package or program somewhere might break -- this can be from namespace pollution (installing multiple modules that are imported in the same way but work differently) or having different versions of the software (an update breaks some functionality that something else relies on). Even if Django itself doesn't break anything, some dependency it has might be able to.\nAnother advantage is that you can always run pip freeze > requirements.txt in your environment to list all installed packages and versions, then pip install -r requirements.txt in another environment. This makes package import and versioning effortless when you move among development machines or between development and production, and helpful if you'd ever like to roll your own package.","Q_Score":0,"Tags":"python,django,web-applications,frameworks,virtualenv","A_Id":58160650,"CreationDate":"2019-09-29T16:20:00.000","Title":"I am not able to access django inside virtual environment","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was able to get it up and running with gunicorn and uvloop, but having a hard time getting this working with hypercorn. Another issue is specifying the number of workers for ASGI frameworks.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":395,"Q_Id":58160769,"Users Score":0,"Answer":"You probably have a line like app = Starlette(debug=True) the app is an ASGI application that can be run by Hypercorn (or other ASGI servers). If this line is in a file called run.py you can run it via hypercorn run:app.\nIf you want multiple workers (2 shown) you can do hypercorn -w 2 run:app. If you want uvloop as well, hypercorn -w 2 -k uvloop run:app.","Q_Score":0,"Tags":"python-3.x,starlette,hypercorn","A_Id":58322968,"CreationDate":"2019-09-30T02:18:00.000","Title":"How to interface hypercorn and starlette web framwork","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to implement 3 flask docker containers using docker-compose. I'm running each flask app on a different port 127.0.0.1:5000,127.0.0.1:5001,127.0.0.1:5002. I've mentioned the containers in docker-compose.yml file. The docker-compose is creating a default network.\nBut when I try to access 5001 container's flask endpoint from 5000 container's code like \nrequests.get('http:\/\/127.0.0.1:5001\/endpoint'), It is throwing following error.\n\nHTTPConnectionPool(host=\\'0.0.0.0\\', port=5001): Max retries exceeded\n  with url (Caused by NewConnectionError\n\nDoes anyone know why I'm getting this.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1227,"Q_Id":58169484,"Users Score":3,"Answer":"That is because you are attempting to connect to localhost within the docker container itself, i.e. the traffic stays within that docker container.\nWhat you want to do instead is to connect to your other container by its hostname. Within the context of the network managed by docker\/docker-compose that is just the name of the docker container. E.g. for a container foo you can connect over HTTP to port 5001 using http:\/\/foo:5001\/ inside your container.","Q_Score":0,"Tags":"python-3.x,docker,flask,docker-compose,docker-networking","A_Id":58169539,"CreationDate":"2019-09-30T14:00:00.000","Title":"How to call an endpoint of one container from another flask container running on different ports in docker compose?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I apologize if this is obvious, but I'm relatively new to Django and couldn't find any resources for this.\nGoal\nI would like to create unique invoices that are stored on my server (or a CDN) when a form is filled out.\nQuestion\nWould it be possible to use Django forms to create an HTML file with a unique URL (or upload the newly created file to AWS).\nI understand how to upload files, I just can't quite figure out how to create a new file using a form.\nUpdate\nThe reason why I want to create a unique file is so that I can email the invoice to the customer so that they can view the invoice at a later point.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":113,"Q_Id":58173509,"Users Score":0,"Answer":"You can handle the logic in your view where the form is called.\ndef my_view(request):\n    if form.is_valid():\n        do_something_with_data()\nI would be more specific but it's challenging when there is no code to reference.","Q_Score":0,"Tags":"python,django","A_Id":58173588,"CreationDate":"2019-09-30T18:40:00.000","Title":"Use django forms to create a new file","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a web page served by Django, and i want to make it to 301 redirect from \n    mysite.com\/    to    mysite.com    without a slash on the end. Is it possible to do with Django? \nLast version of Django, python 3.6.\npath(\"\", views.home, name=\"main_page\")\nChanging nginx config is not an option at my server","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":35,"Q_Id":58186796,"Users Score":4,"Answer":"mysite.com\/ and mysite.com are the same URL. You don't need to set up a redirect.\nYour friend probably means that you shouldn't have the same content for mysite.com\/foo and mysite.com\/foo\/.\nIn Django, you would usually achieve this by using the URL foo\/, then the default setting APPEND_SLASH = True will redirect \/foo to \/foo\/.","Q_Score":1,"Tags":"python,django","A_Id":58186934,"CreationDate":"2019-10-01T14:18:00.000","Title":"Redirect from .com\/ to just .com","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using DJANGO and i want to integrate an SMS API into my DJANGO app. Can anyone help in knowing where (in which file) to write the code for integration and also the code to integrate SMS API?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":98,"Q_Id":58191010,"Users Score":0,"Answer":"It depends on your requirements. If you have a complex sms sending system, it would be better to create a new django app for this system and write a class (maybe model) for processing sms sending. I'd advice you to keep models fat, but views skinny. You can execute sms sending from signals, celery, views so on, according to your needed of course.\nRegarding to the integrating code, take a look on the sms provider's specification. It must exists. If not, find a better provider, who cares about his clients.","Q_Score":0,"Tags":"python-3.x,django-rest-framework","A_Id":58197344,"CreationDate":"2019-10-01T19:18:00.000","Title":"SMS API integration in django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Please Everybody. I have a little problem with pipenv. \nFor instance, I am work on a Django project and I decided to sleep. I had to shutdown my laptop for some reason. Then i woke up navigated to the project and I open it in VScode again. My question is how to I reactivate the pipenv environment again. \nI mean something like source bin\/activate if you are using virtualenv\nI use pipenv shell but i want to be sure that is absolutely right.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":787,"Q_Id":58192460,"Users Score":0,"Answer":"pipenv \u2014venv to get the location of the virtualenv\nThen activate it like a normal virtualenv.","Q_Score":1,"Tags":"python,django,virtualenv,pipenv,virtual-environment","A_Id":58192630,"CreationDate":"2019-10-01T21:26:00.000","Title":"Python\/Django: How to reactivate pipenv after exiting","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Please Everybody. I have a little problem with pipenv. \nFor instance, I am work on a Django project and I decided to sleep. I had to shutdown my laptop for some reason. Then i woke up navigated to the project and I open it in VScode again. My question is how to I reactivate the pipenv environment again. \nI mean something like source bin\/activate if you are using virtualenv\nI use pipenv shell but i want to be sure that is absolutely right.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":787,"Q_Id":58192460,"Users Score":0,"Answer":"As a new user of both Django and Pipenv I recently ran into the same issue. Maybe this will help someone. \n(for Mac m1 steps maybe different for you)\n\nexpose hidden folders inside the home directory.  Shift + command + > \nyou should see a folder called \" .local.\" follow it through... \n.local > share, virtualenvs.  The virtualenvs is what your looking for. It contains folders for all of pipenvs.\nfrom the integrated terminal inside vscode I cd into whichever pipenv folder coorespondes to the project I'm working on then run: \nsource bin\/activate. \nthe terminal should return with an indicator in parens ahead of user name confirming the shell is active again: \n(Blog) user@user-MBP Blog % \ncd back into project folder (the one containing manage.py)  and run python manage.py runserver \nshould be good to go.","Q_Score":1,"Tags":"python,django,virtualenv,pipenv,virtual-environment","A_Id":67703966,"CreationDate":"2019-10-01T21:26:00.000","Title":"Python\/Django: How to reactivate pipenv after exiting","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"How is it possible to search for a table tag in a parsed html independent of its class and attributes ?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":25,"Q_Id":58194412,"Users Score":0,"Answer":"Assuming that soup below is your parsed html, then you can find any tag. Table is just a specific type of tag:\nsoup.find_all('table')","Q_Score":0,"Tags":"python,beautifulsoup","A_Id":58194675,"CreationDate":"2019-10-02T02:19:00.000","Title":"How to search for a table in beautifulsoup that independent of attribute and class","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am quite new to flask and have been reading up on the use of Blueprints when creating a new project. I am currently working on a small personal website for myself, however I have some questions on where certain processes should be done.\nSay I want to retrieve some blog posts from a database, I can create a model and use this to retrieve all the data I want, however I am currently planning on writing the code to initiate the retrieval of the blog posts within the view route, I have a feeling this is an incorrect way to go about doing this and that as much logic as possible should be removed from the views file...?\nIf this assumption is true, where would you generally place all the functional logic? Would you create a helper file within the app and have this file be dedicated to handle all custom logic?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":805,"Q_Id":58198220,"Users Score":0,"Answer":"Most of the codebases you find will have a MVC Structure\n\nM = Model\nV = View\nC = Controller\n\nModels folder will hold \"models\", which is basically a fancy term for Classes that have the ability to interact with a particular table in your Relational Database.\nViews folder will contain all your html templates, which you can render.\nControllers folder will contain controller, which are basically routes, which are invoked by other services, or your frontend.\nIt is also a good practice to separate Business\/Functional Logic to a folder called Managers. \nLets say you have a Controller called resource_controller, here you can write the logic for handling the API requests to the routes that pertain to this resource. \nAll the business logic for resource_controller should be held in resource_manager. All the retrieval, manipulation of data should be handled by the resource_manager. You would also need a resource model. The job of resource is to perform CRUD operations with the database, and return the necessary data to the resource_manager, which will in turn process the data into information and may pass it to the resource_controller. You can return the processed data from the resource_controller back according to your needs.\nYou may also have a helper file containing code shared by multiple managers.","Q_Score":0,"Tags":"python,flask","A_Id":58200760,"CreationDate":"2019-10-02T08:50:00.000","Title":"Flask - Where is the best place to place functional logic?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a django project which is working fine. However, this question can be related to any django project.\nDjango works in a way that after running python manage.py runserver the project is accessible at localhost:8000. But when you deliver the project to the customer you cannot expect them to open command windows every time, then run python manage.py runserver, then open a browser, then type localhost:8000 and etc.\nI have heard docker might be a solution to this. But docker will need the scripts available in the local machine. I am talking about making a full installation file like when you buy a video game and the scripts are not accessible easily (seems there are binary files).\nThe real question is how can we protect our code and scripts and be sure they cannot be accessed easily after we have installed them in a customer's computer?\nEdit: My client is the service provider who will host the project for its own clients. That is why I am seeking to deliver the project in a way that is at least different from just copying and pasting everything.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1032,"Q_Id":58216039,"Users Score":0,"Answer":"Django is webdevelopment framework. So it enables you to make web applications, not native apps (like the video games you've mentioned).\nOnce you feel you have a releasable product (build with django) and you would like your customers to acces your django website\/application you should deploy it to a public server\/host. That way your customers only need to open there browsers and go to your application. \nYou can do this a 100 different ways with a 1000 different setups, depending on the usage and complexity of your (web)application. To do this you need to know a little bit about system administration. There are a ton of tutorials online on how to deploy django projects.\nMost important for you to learn is that you build a webapplications with Django wich can be taken in production by publishing it on the web and not by downloading some .exe file.","Q_Score":1,"Tags":"python,django,docker,installation","A_Id":58216284,"CreationDate":"2019-10-03T09:20:00.000","Title":"What is the best way to deliver django project as a full installation file (setup.exe) to be user-friendly and not revealing your whole scripts?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I want to make something like this: I will have list of email and password of a certain website. I want to check that email and password work for that website. I want it to go put that email and password in email and password box of certain website. If that logged in then it will say Logged in else not logged in.\nCan I built it with Python module called Scrapy?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":80,"Q_Id":58222912,"Users Score":0,"Answer":"Yes, you can.\nWhether Scrapy is the best choice for your use case depends on the details you have not shared.","Q_Score":0,"Tags":"python-3.x,scrapy","A_Id":58410314,"CreationDate":"2019-10-03T15:59:00.000","Title":"Can Python Scrapy module help us to make an account checker?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I currently have Airflow set up and working correctly using the CeleryExecutor as a backend to provide horizontal scaling. This works remarkably well especially when having the worker nodes sit in an autoscaling group on EC2.\nIn addition to Airflow, I use plain Celery to handle simple asynchronous tasks (that don't need a whole pipeline) coming from Flask\/Python. Until now, these plain Celery tasks were very low volume and I just ran the plain Celery worker on the same machine as Flask. There is now a requirement to run a massive number of plain Celery tasks in the system, so I need to scale my plain Celery as well.\nOne way to do this would be to run the plain Celery worker service on the Airflow worker servers as well (to benefit from the autoscaling etc.) but this doesn't seem to be an elegant solution since it creates two different \"types\" of Celery worker on the same machine. My question is whether there is some combination of configuration settings I can pass to my plain Celery app that will cause @celery.task decorated functions to be executed directly on my Airflow worker cluster as a plain Celery task, completely bypassing the Airflow middleware.\nThanks for the help.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":914,"Q_Id":58247023,"Users Score":0,"Answer":"The application is airflow.executors.celery_executor.app if I remember well. Try celery -A airflow.executors.celery_executor.app inspect active for an example in your current Airflow infrastructure to test it. However, I suggest you do not do this because your Celery tasks may affect the execution of Airflow DAGs, and it may affect the SLAs.\nWhat we do in the company I work for is exactly what you suggested - we maintain a large Celery cluster, and we sometimes offload execution of some Airflow tasks to our Celery cluster, depending on the use-case. This is particularly handy when a task in our Airflow DAG actually triggers tens of thousands of small jobs. Our Celery cluster runs 8 million tasks on a busy day.","Q_Score":1,"Tags":"python,flask,celery,airflow","A_Id":58247402,"CreationDate":"2019-10-05T09:30:00.000","Title":"How to execute plain Celery tasks on Airflow workers","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"So, here is my question's overview:-\nI basically want to login into azure account. I have created my azure login credentials from azure portal. And now i want to login into azure account but not from portal.azure.com site, I want to login through a webapp which i have developed using Django.\nI have a webapp developed which has login and password textbox on my django site, now i want to enter my azure credentials here on this webapp and it should also get logged in on azure portal, rendering azure portal after login is not necessary.\nCould anyone help me out here?\nThank you in advance.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":198,"Q_Id":58248230,"Users Score":1,"Answer":"What you are asking for isn't really possible.\nThe ROPC flow could be used to acquire access tokens to APIs using a user's credentials. \nThat won't setup single sign-on though. \nThat requires interactive authentication on the Azure AD login page, so that it can set the cookie to track the SSO session. \nNow if you want to access certain things on behalf of a user in your app, you can authenticate the user with one of the authentication flows offered by Azure AD. \nAuthorization code flow \/ hybrid flow will probably work for your app. \nBut don't use ROPC. \nYou should not be handling user credentials. \nIt also won't work if the user has MFA and in some other cases. \nThen once you have authenticated the user, you can get an access token to call the Azure Resource Management API or any other APIs that are available to your app.","Q_Score":2,"Tags":"python,django,azure,authentication,web-applications","A_Id":58250894,"CreationDate":"2019-10-05T12:21:00.000","Title":"Azure login using Django webapp","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Trying to get Firefox Portable v46 to function in headless mode. (only portable version that works)\nChrome portable can do this but I would like to know if firefox portable can.\nI must include capabilities_argument[\"marionette\"] = False otherwise an exception is thrown:\nselenium.common.exceptions.SessionNotCreatedException: Message: Unable to find a matching set of capabilities\nIn normal Firefox (not portable + recent version) ... disabling marionette also causes ops.add_argument(\"--headless\") to fail ... this is why I believe disabling marionette is the issue.\nos.environ['MOZ_HEADLESS'] = '1' ... Does not work either.\nbrowser.set_window_position(-3000, 0) ... works, but only after being visible\nI am also running multiple instances of firefox, hiding from task manager might not be an option.\nIs there a way I can import marionette or get it to work somehow?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":217,"Q_Id":58257620,"Users Score":0,"Answer":"I have discovered that (in windows), once Firefox (most recent gecko-driver compatible version) is installed, the folder in which firefox.exe is kept, is portable.\nThe folder can be transferred to any windows machine even if it has never had Firefox installed. And the folder containing Firefox.exe will run Firefox successfully\nThis is the same with Chrome","Q_Score":0,"Tags":"python-3.x,selenium,geckodriver,selenium-firefoxdriver","A_Id":58266615,"CreationDate":"2019-10-06T13:19:00.000","Title":"python - selenium firefox portable headless fails","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an application that uses two servers that need to communicate with one another. One is a python server that implements BaseHTTPRequestHandler's do_METHODs. The other is node js's development server\/production server that hosts a React JS application.\nThe node js application uses a POST request to get a message from an input which the python server extracts that message from that POST request and then calls Amazon's Lex using Boto3 to get a response.\nWhenever I run node js development server (on localhost:3000) and the python server (on localhost:3001), the python server is able to recognize that a POST request has been made and goes ahead and gets a response. However, when I run node js production server (on localhost:5000) and the python server (on localhost:3001), the node js server is unable to communicate with the python server. Why is this?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":243,"Q_Id":58262399,"Users Score":0,"Answer":"After much research, I felt like having two local applications running on different ports is a little impractical or rather more complicated than it should be. \nAs such, I have migrated my project to use Django instead of using React JS and integrate it with python. This way Django's back-end can handle the POST requests I make and update the DOM as needed. \nAll this is for a chatbot application that is suppose take a user's question, call Amazon's Lex for a intent and entity which then spaCy, a ML framework, searches our database for an answer. The answer is then returned and the DOM is then updated without refreshing the page.","Q_Score":1,"Tags":"python,node.js,reactjs","A_Id":58384477,"CreationDate":"2019-10-07T00:51:00.000","Title":"Communicate between a python server and node server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have to set up a worker which handles some data after a certain event happens. I know I can start the worker with python manage.py runworker my_worker, but what I would need is to start the worker in the same process as the main Django app on a separate thread.\nWhy do I need it in a separate thread and not in a separate process? Because the worker would perform a pretty light-weight job which would not overload the server's resources, and, moreover, the effort of making the set up for a new process in the production is not worth the gain in performance. In other words, I would prefer to keep it in the Django's process if possible.\nWhy not perform the job synchronously? Because it is a separate logic that needs the possibility to be extended, and it is out of the main HTTP request-reply scope. It is a post-processing task which doesn't interfere with the main logic. I need to decouple this task from an infrastructural point-of-view, not only logical (e.g. with plain signals).\nIs there any possibility provided by Django Channels to run a worker in such a way?\nWould there be any downsides to start the worker manually on a separate thread?\nRight now I have the setup for a message broker consumer thread (without using Channels), so I have the entry point for starting a new worker thread. But as I've seen from the Channel's runworker command, it loads the whole application, so it doesn't seem like a na\u00efve worker.run() call is the proper way to do it (I might be wrong with this one).","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":383,"Q_Id":58268408,"Users Score":0,"Answer":"I found an answer to my question.\nThe answer is no, you can't just start a worker within the same process. This is because the consumer needs to run inside an event loop thread and it is not good at all to have more than one event loop thread in the same process (Django WSGI application already runs the main thread with an event loop).\nThe best you can do is to start the worker in a separate process. As I mentioned in my question, I started a message broker consumer on a separate thread, which was not a good approach either, so I changed my configuration to start the consumers as separate processes.","Q_Score":1,"Tags":"python,django,multithreading,django-channels","A_Id":58323227,"CreationDate":"2019-10-07T11:11:00.000","Title":"Start a Django Channels Worker within the same process","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am scraping elements from a web page & I can see the element being visible (numeric value) on the web page in a grayed out box ,but when tried to inspect the element I cant find it between the  tags. I assumed the URL might be any webservice endpoint & tried to GET from postman but it returned mere HTML code not a JSON response.\nIn general, we can get values between the tags by finding the element & getting innerText attribute in selenium that too failed as there is no text in between the tags.\nI cannot post any URL or responses due to security compliance issues in my org. Please advise any other way I can work around.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":173,"Q_Id":58274532,"Users Score":0,"Answer":"Got my answer , tried running JS code \"document.querySelector('input[name=assets_tot_mfr]').value;\" and ran it through python execute_script. Thanks","Q_Score":0,"Tags":"json,python-3.x,web-scraping","A_Id":58274633,"CreationDate":"2019-10-07T17:35:00.000","Title":"Value present on browser but not available in inspect element","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm developing django 2.2 (with mySql database) application with some code to import data from csv sources.\nCode is synchronous:\n\nload next csv line and do some pre-processing (normalize\/sanitize\ninput data)\ncreate or update django model from input data (and perform database\nread\/write)\n\nThere are obvious bottlenecks here:\n\ndisk i\/o on reading line from csv file (few files with more than 4M\nrecords)\nnetwork i\/o on database communication (tcp\/ip socket)\n\nThe process could be optimized:\nRead input data, then pass it to asynchronous code for database operation - fire and forget. Instead of waiting for DB to finish, load next csv line.\nWhat is your recommendations on optimization strategy in this case?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":33,"Q_Id":58291520,"Users Score":0,"Answer":"for your question...\ntry to use django with gevent\n1) uses 'csv' lib and 'csv.reader' and loop on the on the returned element from 'csv.reader' call\n2) uses Mysqldb or pymsql as the django orm's dialect lib to access your database asynchronously","Q_Score":0,"Tags":"python,concurrency","A_Id":58291920,"CreationDate":"2019-10-08T17:44:00.000","Title":"How can I use asynchronous code in synchronous Python code?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I keep getting the error that str object is not callable. my line of code is pasted below... can anyone tell me what I am doing wrong.\nrandom = str(uuid.uuid4().hex().upper()[0:6])","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":50,"Q_Id":58291692,"Users Score":1,"Answer":"change hex() to hex. .hex is a property, not a function, and it already returns a string.","Q_Score":0,"Tags":"python,string","A_Id":58291725,"CreationDate":"2019-10-08T17:55:00.000","Title":"str object is not callable in django python code","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have development environment for running my new website with python manage.py runserver\nand I have production environment that running this website with Apache2 and mod wsgi\nI am sending some variables in my views.py that render successfully on my development env, but same code on the prod env render nothing to the template","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":68,"Q_Id":58295184,"Users Score":0,"Answer":"Fixed this by setting:\nServerName mysite.com\nin my apache config","Q_Score":0,"Tags":"python,django,templates,view,rendering","A_Id":58295524,"CreationDate":"2019-10-08T23:29:00.000","Title":"Django python rendering on dev but not on production","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Does Django render websites and serve them from a views folder similar to how the express framework works in JavaScript? Or does it render pages on the client side similar to an applicatipn running express in the back-end and some fron end framework such as Vue.js in the front-end","AnswerCount":3,"Available Count":2,"Score":0.1325487884,"is_accepted":false,"ViewCount":4918,"Q_Id":58305068,"Users Score":2,"Answer":"If you are talking about the template language, it happens on the backend. This is true of every framework and every language. In the templates, the placeholders are replaced, they produce a valid html\/javascript page, and that's what is returned to the browser (or, to whatever accessed that url). Essentially, it is a shortcut for creating an html file by concatenating strings.\nA suggestion: don't use the template language, in any backend framework. Just use django to create rest services that return the data, and use a front-end framework like Vue\/angular\/react to create the actual front end part.","Q_Score":5,"Tags":"python","A_Id":58305134,"CreationDate":"2019-10-09T13:17:00.000","Title":"Does Django render web pages on the server side?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Does Django render websites and serve them from a views folder similar to how the express framework works in JavaScript? Or does it render pages on the client side similar to an applicatipn running express in the back-end and some fron end framework such as Vue.js in the front-end","AnswerCount":3,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":4918,"Q_Id":58305068,"Users Score":8,"Answer":"Django can do either, but it is designed to render on the server side in its default configuration, not the client side. \nTo use server side rendering, use Django as intended and according to the many tutorials out there. \nTo use client side rendering with something like React or Vue, use the Django Rest Framework.","Q_Score":5,"Tags":"python","A_Id":58305137,"CreationDate":"2019-10-09T13:17:00.000","Title":"Does Django render web pages on the server side?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created three containers, one is for Python Flask application, second is for PostgreSQL db and third is for angular8. Im using Docker compose to run this. my question so each container has ports so total 3 ports. Is there a way I can use only one port to run this whole application like Docker Run instead of Docker Compose? All I want is a single port where this API can be called from anywhere.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":30,"Q_Id":58309095,"Users Score":0,"Answer":"If the only thing you want to be visible to the \"outside\" is the API, you can use the --link flag when calling docker run.  Basically, start up the PG container, then start up the Flask container, linking to PG, then start up the Angular container, linking to Flask.  However, the --link flag is a legacy feature, and may disappear sometime in the future.\nAnother option is to create a network with docker network create and make sure your three containers are all using that same network.  They should all be able to communicate with each other in this way, and you just need to publish the API port so that other apps can use your API.\nI'm not sure what your requirements are, but docker-compose is generally the cleaner way to do it, as it helps you achieve consistency in your automations.","Q_Score":0,"Tags":"python,postgresql,docker,flask,angular8","A_Id":58309625,"CreationDate":"2019-10-09T17:08:00.000","Title":"How to use Single port for 3 containers instead of 3 ports Python-Flask, PostgreSQL & Angular8 ? so I can use Docker Run instead of Docker Compose","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a project which includes two different apps: users and school. In my current implementation, the users app contains a custom user class derived from Djagno's AbstractUser. It defines allowed user types as student or teacher, and the user must select one during registration. The school app contains a classroom model which I need to relate to students and one or more teachers.\nI have two main problems here. The first is regarding how to relate the classroom model to only specific users restricting their access based on their user type. I have tried using a ManyToManyField relation in the classroom model in order to associate the instance with the user who created it (and then I would later allow the user to add students). It appears I don't understand this field correctly -- it actually all users to all classroom instances. This obviously does not meet my requirement to restrict access among different classroom instances.\nOneToOneField and ForeignKey do not seem to meet my needs either. I have tried adding those fields to my user, but then I am restricted to a single classroom per user which is not acceptable either.\nI have also played around with creating groups named something like \"Classroom_A_teachers\" and \"Classroom_A_students\" and then assigning permissions to them. This approach seems more complicated than necessary.\nAm I overlooking something here? This is my first Django project, and I could easily have missed something basic.\nProblem two is regarding adding a teacher and student model. I would like to allow a user who is registered as a teacher to be able to create a classroom instance and then to populate that classroom with student instances. Students could optionally create an account too. They would receive a classroom ID from their teacher, enter it, and their account would then be linked to the classroom instance. How can I then associate this user with an existing student model? I have toyed around with this concept with no success.\nAny insight is greatly appreciated!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":44,"Q_Id":58313350,"Users Score":0,"Answer":"It appears I don't understand this field correctly -- it actually all users to all classroom instances.\n\nIt shouldn\u2019t do that. It can just look that way in the Django Admin. The only ones actually in the ManyToMany field are the ones which are highlighted\/greyed. \nManyToMany is appropriate for your use case.","Q_Score":0,"Tags":"python,django,django-models,django-users","A_Id":58313760,"CreationDate":"2019-10-09T23:01:00.000","Title":"How can I relate some, but not all, models to users using Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to scrape a stocks website and get the prices using selenium. I can't use normal HTML requests as the HTML is dynamic. \nI am using the headless selenium webdriver to get the data, but it takes around 30 seconds for each request. \nIs there a faster way to get the dynamic HTML?","AnswerCount":3,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":793,"Q_Id":58315190,"Users Score":3,"Answer":"No, you are stuck with Selenium's wait-time with rendering\nDynamic HTML requires a full browser. There is not much negotiating with that. If your pages are separate and distinct, i.e. you are scraping stocks.com\/oilandgas as well as stocks.com\/agriculture, there is a possible way to speed things up. \nThe one option you might have is to create a separate thread for each Selenium Webdriver instance and have both web pages scraped at the same time by two different Selenium Webdrivers. \nThe caveat to that is that it will only speed things up if the bottleneck (what is causing the slowness) is the rendering of the website.\nIf it is the internet speed, the processing power of your computer, or the server speed of the website, this would not improve things. \nActually, Daniel Farrell below suggests that it would improve the networking speed. You may want to give this a shot.","Q_Score":0,"Tags":"python,selenium,web-scraping,dynamic-html","A_Id":58315244,"CreationDate":"2019-10-10T03:48:00.000","Title":"Fastest way to get dynamically updated HTML content from website?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Django web application with a postgresql database on an AWS server. \nI want to keep this database in sync with a nosql cloud firestore database. We're using cloud firestore as the backend for a mobile app.\nThis means that every form update or new object that is added to the web app needs to be in sync with cloud firestore. \nI'm able to update cloud firestore using the Python SDK when each form is submitted via the web app. However, I want to know if this is the best method to keep these two databases in sync. Each time a form is submitted, I have to import the firebase SDK, and then use the methods to update cloud firestore. Obviously, this will take time, but I'm unsure if this method is better, or if using the JavaScript SDK will be better. In essence, which method will perform better?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":79,"Q_Id":58318749,"Users Score":2,"Answer":"When you are doing that from python SDK the read and write to cloud fire storage is done from the server means if you have x request and y number of users doing that, your server has to do x*y request to Cloudflare storage. in this case, your transaction from the server will be heavily based on a user basis but you can use admin SDK in python and give only admin to access to DB.\nIf you want to use js for the same then request will be shared by users and the server will be free but each user should have access to DB write and read, you have to be more careful about authenticating users.\n\nso if its all read requests and user-based filters are done well use from js, if you have doubts on authentications or you don't want to take a risk in that use from python.","Q_Score":0,"Tags":"javascript,django,python-3.x,firebase,google-cloud-firestore","A_Id":58319963,"CreationDate":"2019-10-10T08:38:00.000","Title":"Which method is better: Python SDK (server side) or JavaScript SDK (client-side) to add to and update cloud firestore?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a cluster setup of 3 nodes. \nI am designing my microservice and I am wondering if each node should have their own Cassandra session or if all three should share the same session created by any of the nodes.\nI have read in the Cassandra docs:\n\n\"The Session instance is a long-lived object and it should not be used\n  in a request\/response short-lived fashion. Basically you will want to\n  share the same cluster and session instances across your application.\"\n\nWhat does this mean?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":55,"Q_Id":58320879,"Users Score":1,"Answer":"You share your session on application level. Different applications should have own sessions.\nYour quote means that you dont open a session for a query but rather have a singleton Session instance in your application.","Q_Score":1,"Tags":"python,cassandra","A_Id":58321657,"CreationDate":"2019-10-10T10:32:00.000","Title":"Should every instance of application have their own cassandra session or they should share the same session?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on a project in which I need to implement a functionality wherein a folder or directory is protected using a password. As in, when someone tries to open that particular folder, a password prompt is presented to them. If correct password is entered, then folder access is granted or else not.\nIs this possible using python or Java ? Is yes then how ? And if not then which language can be used ?\nI tried searching a lot but nothing helpful came out of it.","AnswerCount":1,"Available Count":1,"Score":-0.1973753202,"is_accepted":false,"ViewCount":129,"Q_Id":58321548,"Users Score":-1,"Answer":"If you mean folders on the file system then you could mimick this behavior by storing files in a password protected zip file. \nIf you mean conceptual folders within your application then you are free to implement authentication any way you want. Normally this involves a user logging in to your application to gain access to the protected resources.","Q_Score":0,"Tags":"java,python,python-3.x","A_Id":58321590,"CreationDate":"2019-10-10T11:11:00.000","Title":"Password protecting folder or directory in java or python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to store images in database for various users.Its just like famous blog app but instead of blogs i want to store images in database.How can i implement my idea?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":603,"Q_Id":58324502,"Users Score":0,"Answer":"You can do one thing -> change the image into base64 string and save it to database than when you want that image convert it from base64 to normal format.\nand you can find multiple tutorial on internet how to change image to base64 in python.\nwhy i am suggesting this because i used it in an android app.","Q_Score":0,"Tags":"python,django,image,django-models,storage","A_Id":58324611,"CreationDate":"2019-10-10T13:48:00.000","Title":"Django:How to store images in database instead of media file?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working with odoo11 community version and currently I have some problem.\nThis is my exmplanation of problem:\nIn company I have many workcenters, and for each workcenter:\n1) I want to create separate warehouse for each workcenter\nor\n2) Just 1 warehouse but different storage areas for each workcenter\n(currently I made second option) and each workcenter have their own operation type: Production\nNow my problem started, There are manufacturing orders and each manufacturing order have few workorders, And I want to do something that when some workorder is started then products are moved to this workcenter's warehouse\/storage area and they are there untill next workorders using different workcenter starting then product are moved to next workcenter warehouse\/storage area.\nI can only set that after creating new sale order production order is sent to first Workcenter storage area and he is ther untill all workorders in production order are finished, I don't know how to trigger move routes between workcenters storage areas. for products that are still in production stage\nCan I do this from odoo GUI, or maybe I need to do this somewhere in code?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":41,"Q_Id":58332889,"Users Score":0,"Answer":"Ok, I found my answer, which is that to accomplish what I wanted I need to use Manufacturing with Multi levell Bill of material, it working in way that theoretically 3 steps manufacturing order is divided into 3 single manufacture orders with 1 step each, and for example 2 and 3 prodcution order which before were 2 and 3 step are using as components to produce product that are finished in previous step which now is individual order.","Q_Score":0,"Tags":"python,odoo,odoo-11","A_Id":58356611,"CreationDate":"2019-10-11T00:57:00.000","Title":"Warehouse routes between each started workorder in production order","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Good day folks\nRecently, I made a python based web crawler machine that scrapes_ some news ariticles and django web page that collects search title and url from users.\nBut I do not know how to connect the python based crawler machine and django web page together, so I am looking for the any good resources that I can reference.\nIf anyone knows the resource that I can reference,\nCould you guys share those?\nThanks","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":101,"Q_Id":58333930,"Users Score":0,"Answer":"There are numerous ways you could do this. \nYou could directly integrate them together. Both use Python, so the scraper would just be written as part of Django. \nYou could have the scraper feed the data to a database and have Django read from that database. \nYou could build an API from the scraper to your Django implementation. \nThere are quite a few options for you depending on what you need.","Q_Score":0,"Tags":"python,django,web-crawler","A_Id":58335189,"CreationDate":"2019-10-11T03:40:00.000","Title":"How to Connect Django with Python based Crawler machine?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was wondering if it is possible for me to use Django code I have for my website and somehow use that in a mobile app, in a framework such as, for example, Flutter.\nSo is it possible to use the Django backend I have right now and use it in a mobile app?\nSo like the models, views etc...","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":16475,"Q_Id":58337572,"Users Score":15,"Answer":"Yes. There are a couple ways you could do it\n\nUse the Django Rest Framework to serve as the backend for something like React Native. \nBuild a traditional website for mobile and then run it through a tool like PhoneGap. \nUse the standard Android app tools and use Django to serve and process data through API requests.","Q_Score":7,"Tags":"python,android,django,django-models,mobile","A_Id":58337906,"CreationDate":"2019-10-11T08:52:00.000","Title":"Is it possible to make a mobile app in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Can anyone please let me know how to simulate mouse hover event using robot framework on a desktop application. I.e if I mouse hover on a specific item or an object, the sub menus are listed and i need to select one of the submenu item.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1537,"Q_Id":58338018,"Users Score":0,"Answer":"It depends on the automation library that you are using to interact with the Desktop application. \nThe normal approach is the following: \n\nFind the element that you want to hover on (By ID or some other unique locator)\nGet the attribute position of the element (X,Y)\nMove your mouse to that position. \n\nIn this way you don\u00b4t \"hardcode\" the x,y position what will make your test case flaky.","Q_Score":0,"Tags":"python,robotframework","A_Id":58340413,"CreationDate":"2019-10-11T09:16:00.000","Title":"how to simulate mouse hover in robot framework on a desktop application","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to import some data from web, where the data is being updated every 1 second. \nHowever, the problem is that when I try to soup this data, all data are not imported. When the data is not being updated, my code works well. But when the data is being updated(from 8 a.m. to 12 a.m.), some of those are not imported properly. \nIt's a table with 500 rows and 12 columns, where each column is stored in a separate variable. It is expected that the variables have the same length. This is true when data are not updated, but when I run the code from 8 a.m. to 12 a.m.(when data are being updated) the variables do not have the same length. Any advice or recommendation would be greatly appreciated.\nI am using selenium to open the web page and execute some commands to read data with beautiful-soup.","AnswerCount":1,"Available Count":1,"Score":0.537049567,"is_accepted":false,"ViewCount":148,"Q_Id":58338256,"Users Score":3,"Answer":"Since there is no code and I don't know the website, here are some general thoughts:\n\nAs Maxime suggested - Is there an API you could use?\nCan you ditch selenium? Using something like requests might be faster and will help you get the timings right.\nIs the stuff you want to scrape already loaded when you try to save it?\nIs your internet connection keeping up with the amount of requests you sent?","Q_Score":0,"Tags":"python,python-3.x,selenium-webdriver,beautifulsoup","A_Id":58338671,"CreationDate":"2019-10-11T09:28:00.000","Title":"what is the best way to import high frequency updating data in python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created a database in pythonanywhere, after doing my migrations from my django project etc.. i wanted to create a trigger in my db, but the following message appears:\n\nERROR 1419 (HY000): You do not have the SUPER privilege and binary logging is enabled (you might want to use the less safe log_bin_trust_function_creators variable)\n\nMy user does not have the permissions","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":107,"Q_Id":58345033,"Users Score":1,"Answer":"You cannot create triggers in MySQL on PythonAnywhere","Q_Score":1,"Tags":"mysql,mysql-python,pythonanywhere","A_Id":58355715,"CreationDate":"2019-10-11T16:12:00.000","Title":"ERROR 1044 creating a trigger in mysql on pythonanywhere","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to make a related field with two other fields. Right according to my knowledge we can have only one. Is there is any other option?\nI don't want a compute field. Because the field should be editable.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":63,"Q_Id":58363335,"Users Score":0,"Answer":"Computed field can also editable fields make it readonly=False and make store true for it so that it relate to your two fields if you make any change in them it will reflect in your computed field and if not then you can put your value in that field and store that field data so it can save its value also.","Q_Score":0,"Tags":"python,python-2.7,odoo,odoo-10","A_Id":58704915,"CreationDate":"2019-10-13T11:56:00.000","Title":"How to make a related field with two conditions?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"As the title says, when i run pip3 freeze or pip3 list there is no output on the terminal!\nVirtualenv seems also to be broken cause when i was inside of the env it was using the global django-admin.\nI did  sudo pip3 install --upgrade pip and after that i think it broke.\n\nOS: Manjaro Linux \nPython3 Version: Python 3.7.4 \nPip3 Version: pip\n19.2.3 from \/usr\/lib\/python3.7\/site-packages\/pip (python 3.7)","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":871,"Q_Id":58365032,"Users Score":1,"Answer":"Find out how to cleanly reinstall pip (or even Python) from your operating system and really try to avoid anything with sudo pip or even sudo python. My recommendation is to not even install pip at all and use the one preinstalled in the virtual environments (when you do python3 -m venv .venv) instead, this is to avoid any conflict with the Python packages installed by your operating system.","Q_Score":0,"Tags":"python,linux,pip,django-admin,virtualenv","A_Id":58374956,"CreationDate":"2019-10-13T15:28:00.000","Title":"When i run pip3 freeze or pip3 list there is no output","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using a for loop and inside that forloop i generate tables out of DataBase data.\nThe thing is that i need to show multiple tables, but the if statement in Jinja2 doesn't seem to work for some reason. I need to check if the string on index 2 of my_list[2] is equal to the 'None'.\n{% if '{{my_list[2]}}' == 'None' %}\n   There is no connection. \n{% else %}\n   There is a GOOD connection.\n{% endif %}\nWhy isn't this working?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":27,"Q_Id":58367566,"Users Score":0,"Answer":"{% if not customer_list[2] %}\nThis does exactly wat i needed.","Q_Score":0,"Tags":"jinja2,python-3.7","A_Id":58367736,"CreationDate":"2019-10-13T20:31:00.000","Title":"How do i compare a String out of a list in Jinja2 to another string?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a webpage(Wordpress) updating some tabel information in the MySQL database. And i have a client application on aother pc runing a standalone Pythonscript accessing the same MySQL server for getting and setting data. \nHow do i implment a trigger from my webside that can trigger an event in my python code to see if the data in database are updated, without polling the mysql db ?\nIs there som simple Message Queue I can implement easy or how.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":38,"Q_Id":58372159,"Users Score":1,"Answer":"One solution is to use sockets, another solution is to convert python script into webapp with api (e.g. use Flask) and when your wordpress page sends get\/post http request to python script and tirgger python script to go checking db. The second one is easier to implement from my point of view. Sockets are more difficult for me.","Q_Score":0,"Tags":"python,mysql,wordpress","A_Id":58372282,"CreationDate":"2019-10-14T07:43:00.000","Title":"How do i sent a event from a webpage to a client application","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to deploy a Python webapp on AWS that takes a USERNAME and PASSWORD as input from a user, inputs them into a template Python file, and logs into their Instagram account to manage it automatically. \nIn Depth Explanation:\nI am relatively new to AWS and am really trying to create an elaborate project so I can learn. I was thinking of somehow receiving the user input on a simple web page with two text boxes to input their Instagram account info (username & pass). Upon receiving this info, my instinct tells me that I could somehow use Lambda to quickly inject it into specific parts of an already existing template.py file, which will then be taken and combined with the rest of the source files to run the code. These source files could be stored somewhere else on AWS (S3?). I was thinking of running this using Elastic Beanstalk. \nI know this is awfully involved, but my main issue is this whole dynamic injection thing. Any ideas would be so greatly appreciated. In the meantime, I will be working on it.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":36,"Q_Id":58380298,"Users Score":0,"Answer":"One way in which you could approach this would be have a hosted website on a static s3 bucket. Then, when submitting a request, goes to an API Gateway POST endpoint, This could then trigger a lambda (in any language of choice) passing in the two values.\nThis would then be passed into the event object of the lambda, you could store these inside secrets manager using the username as the Key name so you can reference it later on. Storing it inside a file inside a lambda is not a good approach to take. \nUsing this way you'd learn some key services:\n\nS3 + Static website Hosting\nAPI Gateway \nLambdas  \nSecrets Manager\n\nYou could also add alias's\/versions to the lambda such as dev or production and same concept to API Gateways with stages to emulate doing a deployment.\nHowever there are hundreds of different ways to also design it. And this is only one of them!","Q_Score":2,"Tags":"python,amazon-web-services,amazon-s3,amazon-ec2,aws-lambda","A_Id":58380658,"CreationDate":"2019-10-14T15:59:00.000","Title":"Dynamically Injecting User Input Values into Python code on AWS?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have this html code:\n<button class=\"_2ic5v\"><span aria-label=\"Like\" class=\"glyphsSpriteComment_like u-__7\"><\/span><\/button>\nI am trying to locate all the elements that meet this class with phyton, and selenium webdriver library:\nlikeBtn = driver.find_elements_by_class_name('_2ic5v')\nbut when I print \nlikeBtn\nit prints \n[]\nI want to locate all of the buttons that much this div\/span class, or aria-label\nhow do I do that successfully? Thanks in advance\nupdate - when I do copy Xpath from page the print stays the same","AnswerCount":4,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":544,"Q_Id":58382323,"Users Score":0,"Answer":"Is it button class name dynamic or static? \nHow if you try choose By.CssSelector?\nYou can find element by copy selector in element","Q_Score":1,"Tags":"python,selenium,selenium-webdriver","A_Id":58391703,"CreationDate":"2019-10-14T18:35:00.000","Title":"how do I locate the btn by class name?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have path server->api(folder), manage.py.\nPycharm underlines my absolute import from api.views import create_user but it works! If i type like from server.api.views import create_user pycharm does not underline, but it doesn't work","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":153,"Q_Id":58387930,"Users Score":2,"Answer":"PyCharm has option called 'Mark Directory as' when you right click your specific directory in the Project tree. \nTry to mark 'Server' folder as 'Sources root' and it should work fine.","Q_Score":1,"Tags":"python,django,pycharm","A_Id":58387964,"CreationDate":"2019-10-15T05:45:00.000","Title":"Pycharm underlines absolute import, but it works fine","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Specs:\n\nVisual Studio Code 2019\nlattest pip version\nDjango 2.2+ version\nPython latest 3.7 version","AnswerCount":4,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":13918,"Q_Id":58388355,"Users Score":2,"Answer":"In your open your Visual code and then open Command Palette and shortcut is Ctrl+SHIFT+P\nAnd then type there python select interpreter and it will give you your environment name and click it the moment you click it it will create a vscode folder in your project\nit will resolve","Q_Score":4,"Tags":"python,django,visual-studio-code,django-views","A_Id":63787947,"CreationDate":"2019-10-15T06:21:00.000","Title":"Unable to import 'django.http'pylint(import-error)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to send a random one-time password to the user when I create a new user and make him change the password when the user login for the first time.","AnswerCount":3,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1490,"Q_Id":58388869,"Users Score":5,"Answer":"I would suggest different approach to this. \nWhen you create a user, set the active flag to false. so the account is not active and then cannot log in.\nNo need to generate a password, leave it blank.\nInstead, create a url with special token and send the url. If the user goes to this url, it will present a form to set the password for this user.\nThis link is only one time use, and it can even expire after certain number of days.\nYou can look at PasswordResetTokenGenerator in django.contrib.auth.tokens to see how to generate such tokens and change it accordingly.\nYou will also need to craft the url to include somehow which user to use ( probably obscure it somehow as it is not apparent ).","Q_Score":4,"Tags":"python,django,django-rest-framework","A_Id":58390130,"CreationDate":"2019-10-15T06:56:00.000","Title":"How to generate one time password when creating user and send the same to users mail id in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Good morning guys,\ntrying to install the Pygame library on my MacBook Pro...\nI encountered some issues that I'm sure you're able to help me with!\n\nFirst of all I installed the last Python version (3.7.4)\nThan I tried to install via pip the Pygame library, but the process\nwas unsuccessful due to the lack of a Java JKD 13.\nI downloaded and installed the last JDK 13 version (Jdk-13_osx-x64)\nand this process appeared to be successful.\n\nTrying again to finally install the Pygame library an error occurred:\n\nUnable to locate an executable at \"\/Library\/Java\/JavaVirtualMachines\/jdk-13.jdk\/Contents\/Home\/bin\/apt\n\nCan anyone of you guys help me???\nThanks prior!","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":861,"Q_Id":58389228,"Users Score":1,"Answer":"Apt used to be a command coming with the Java Development Kit around Java 6. \nJava 6 is also the latest 32-bit version provided by Apple but that doesn\u2019t run on the newest version of Mac OS. \nI think you should look for a newer version of pygame compatible with your system.","Q_Score":1,"Tags":"java,python,pygame","A_Id":58390511,"CreationDate":"2019-10-15T07:20:00.000","Title":"Pygame and Java JDK 13 installation troubles","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am developing an application with flask, which has a page with a map drawn on it, it is generated by a JSON, when a change is made on the map by the user it sends the change to the server and this makes a response to the user that made the request.\nWhat i want is that when making the response it is made to all the users that are connected to the page so that the information is refreshed, and not only for the one who made the request.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":177,"Q_Id":58394781,"Users Score":0,"Answer":"What you are searching for is notification in push\nim guessing one of the possible options for you is to make you javascript code \\ or html to send a request every few minutes to check for new json\nit can be simple done with ajax and interval","Q_Score":0,"Tags":"python,flask,response","A_Id":58394895,"CreationDate":"2019-10-15T12:31:00.000","Title":"Send response to all clients with FLASK","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I wrote an app with Android Studio and want to send the data that the user enters to my back-end Python script. This should constantly process the received data and send back the evaluation.\nDoes anyone have an idea how this could work?\nthanks in advance","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":279,"Q_Id":58399393,"Users Score":0,"Answer":"From Backend Python: Create 2 web services (GET or POST depending on the requirements). One is to receive the data from Mobile app and other is to send the data to mobile app.\nFrom Android App: You can use Retrofit or volley library for networking and then consume these web services. Use the web service and send the data(Payload) to the backend and also you can use polling to get the data back to the app.","Q_Score":1,"Tags":"python,android,html,https,webserver","A_Id":58400525,"CreationDate":"2019-10-15T16:52:00.000","Title":"Communication between Android app and Python backend","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I wrote an app with Android Studio and want to send the data that the user enters to my back-end Python script. This should constantly process the received data and send back the evaluation.\nDoes anyone have an idea how this could work?\nthanks in advance","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":279,"Q_Id":58399393,"Users Score":0,"Answer":"WebSocket should be the interface of choice.\nThe python script should expose a WebSocket end point . The mobile app can establish a connection to the WebSocket. The socket can act as a bidirectional channel where the app can send and receive data and the python script can do the same. \nFirebase : The app could publish the user inputs to a Firebase topic which the python script listens to. The script can process the inputs and publish to the same channel that the app would listen to. More like a P2P chat","Q_Score":1,"Tags":"python,android,html,https,webserver","A_Id":58399946,"CreationDate":"2019-10-15T16:52:00.000","Title":"Communication between Android app and Python backend","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to load one of the FastText pre-trained models that has a form of a .bin file. The size of .bin file is 2.8GB and I have 8GB RAM and 8GB swap file. Unfortunately, the model starts loading and it occupies almost 15GB and then it breaks with the following error:\nProcess finished with exit code 137 (interrupted by signal 9: SIGKILL)\nBy observing the system monitor, I can see that RAM and swap are fully occupied, so I think it breaks because it is out of memory.\nI'm trying to load the file using Gensim wrapper for FastText\nfrom gensim.models.wrappers import FastText\n model = FastText.load_fasttext_format('..\/model\/java_ftskip_dim100_ws5')\n\nMy questions are the following:\n1) Is there any way to fit this model in the current memory of my system?\n2) Is it possible to reduce the size of this model? I tried the quantization using the following code\n.\/fasttext quantize -output java_ftskip_dim100_ws5 -input unused_argument.txt\nAnd I'm getting the following error:\nterminate called after throwing an instance of 'std::invalid_argument'\n  what():  For now we only support quantization of supervised models\nAborted (core dumped)\nI would really appreciate your help!","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1977,"Q_Id":58407649,"Users Score":2,"Answer":"Some expansion beyond the size-on-disk is expected \u2013 especially once you start performing operations like most_similar(). But, if you're truly getting that error from running a mere 2 lines to load the model, something else may be wrong. \nYou may want to try the non-wrappers gensim FastText implementation \u2013 from gensim.models import FastText \u2013 in the latest gensim, just in case there are extra memory issues with the version you're using. \n(You may also want to check if using the original, compiled Facebook FastText implementation can load the file, and shows similar memory usage.)\nI'm not aware of any straightforward ways to shrink a preexisting FastText model. (If you were training the model from your own data, there are a number of pre-training initialization options that could result in a smaller model. But those limits are not meaningful to apply to an already-trained model.)\nAs you've seen, Facebook has only implemented the 'quantize' trick for the supervised models \u2013 and even if that transformation could be applied to more modes, the supporting gensim code would also then need extra updates to understand the changed models.\nIf you could load it once, in the full (non-wrappers) gensim implementation, it might be practical to truncate all included vectors to be of a lower dimensionality for significant RAM savings, then re-save the model. But given that these are already just-100-dimension vectors, that might cost a lot in expressiveness.","Q_Score":2,"Tags":"python,gensim,fasttext","A_Id":58417036,"CreationDate":"2019-10-16T07:10:00.000","Title":"FastText .bin file cannot fit in memory, even though I have enough RAM","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Redis for caching in my Django project which is hosted on Heroku.\nDuring Redis connection, on random times I got the below error message\n\nError 110 while writing to socket. Connection timed out.\n\nI'm using the below packages with versions\n\npython-3.6.8\nDjango-2.2.2\nredis-3.2.1\ncelery-4.3.0\n\nAlso, I'm access Redis using worker ( celery sometimes).\nCan someone please suggest me to get rid of this problem or any other countermeasure to handle this problem. \nThanks in advance...","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2110,"Q_Id":58413743,"Users Score":0,"Answer":"There are several possible causes for this--the most usual occurs where you have lots of cache evictions caused by the maxmemory setting on redis being too low.  Check to see your redis size using the redis-cli stats command and see if you need more memory to redis.","Q_Score":5,"Tags":"python,django,heroku,redis,celery","A_Id":58415535,"CreationDate":"2019-10-16T12:50:00.000","Title":"Django Redis connection error in heroku: Error 110 while writing to socket. Connection timed out","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am very New to Python web development ,so got confuse while learning ,when we create new Project with the command --django-admin startProject 'ProjectName' \nIt Created a project folder in my drive  and then we  create application in it  suppose with the name of \"calculator\", we start working in it ,\nbut after some more  requirement we have to  create a new different Project with the Name of the Hrms so the question arise for this again we have to run the same command django-admin startProject 'ProjectName' and then we have to create application in it or we  can create in it?","AnswerCount":4,"Available Count":3,"Score":1.2,"is_accepted":true,"ViewCount":360,"Q_Id":58413897,"Users Score":6,"Answer":"One project may have many application in it & you can create app using below code.\ndjango-admin startapp my_new_app.\nAlso you can reuse same app in multiple projects.\nFor Hrm you should create new app instead of new project.\nExample : One ERP projects may have many apps like hrm, sales, purchase, inventory etc.. & we can reuse same apps into another ERP projects also if needed.\nHope above clarifications works for you.","Q_Score":3,"Tags":"python,django","A_Id":58414092,"CreationDate":"2019-10-16T12:57:00.000","Title":"Python Manage.Py","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am very New to Python web development ,so got confuse while learning ,when we create new Project with the command --django-admin startProject 'ProjectName' \nIt Created a project folder in my drive  and then we  create application in it  suppose with the name of \"calculator\", we start working in it ,\nbut after some more  requirement we have to  create a new different Project with the Name of the Hrms so the question arise for this again we have to run the same command django-admin startProject 'ProjectName' and then we have to create application in it or we  can create in it?","AnswerCount":4,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":360,"Q_Id":58413897,"Users Score":0,"Answer":"Start project and start app are very different commands. With the first one you create a project which will have a base structure to work on. The second command is used to create apps which you could classify as controllers. Each app will live in a folder where you will program the business logic and bind endpoints.","Q_Score":3,"Tags":"python,django","A_Id":58414079,"CreationDate":"2019-10-16T12:57:00.000","Title":"Python Manage.Py","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am very New to Python web development ,so got confuse while learning ,when we create new Project with the command --django-admin startProject 'ProjectName' \nIt Created a project folder in my drive  and then we  create application in it  suppose with the name of \"calculator\", we start working in it ,\nbut after some more  requirement we have to  create a new different Project with the Name of the Hrms so the question arise for this again we have to run the same command django-admin startProject 'ProjectName' and then we have to create application in it or we  can create in it?","AnswerCount":4,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":360,"Q_Id":58413897,"Users Score":0,"Answer":"The app would be a new module in your project, let's say it would be a management system with human resources, financial modules, etc., so you would create an app for each of them to better organize, but nothing prevents creating everything in one app.Create a project only if it is something different.","Q_Score":3,"Tags":"python,django","A_Id":58414204,"CreationDate":"2019-10-16T12:57:00.000","Title":"Python Manage.Py","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I must setup a network computer (running Windows Server 2012 R2 Standard) as a production server for django applications, real quick. This is what I've already done:\n\nInstalled Python 3.7.4 (64 bits version)\nInstalled nginx 1.17.4\nInstalled virtualenv\nCreated a virtual environment for hosting my application\nHave my django project ready and running ok with \"manage.py runserver\"\n\nWhere do I go from here? I'm sorry, but I couldn't find instructions simple and atraightforward enough for me so far.\nI could use IIS or Apache as well, but only if it's simpler than nginx.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":431,"Q_Id":58417019,"Users Score":0,"Answer":"Actually there is a way to publish a django app without any other framework like apache ngix and others. \n\nopen windows server 2012's server management app \ncreate a TCP port(the port depends on which you want to use. I am using 1234)\nafter these run manage.py with this code (python manage.py runserver server's ip adress:port you opened) and press enter \nthat's it. this way will run your django app on your ip and port adress but you cannot access django app with a domain\nif you find an other way please share me","Q_Score":0,"Tags":"python,django,nginx,webserver,windows-server-2012-r2","A_Id":60693735,"CreationDate":"2019-10-16T15:37:00.000","Title":"setup server for django application in Windows Server 2012 R2 Standard","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using Appium version V1.15.0 and have already start the server successfully with the default Host: 0.0.0.0 and Port: 4723\nBut now when i try to start the server it shows me this error \"Error Starting Appium server: listen EADDRINUSE 0.0.0.0:4723\"\nI have tried to solve this issue by changing the port but could not find any solution.\nSuggest me if you guys have any better solution.","AnswerCount":4,"Available Count":3,"Score":0.1488850336,"is_accepted":false,"ViewCount":3805,"Q_Id":58424717,"Users Score":3,"Answer":"I have found the solution. After restarting my computer, i could successfully run the Appium server.\nIf anyone face the same problem. Please follow below steps:\n1. Check if the port is listening to any other services.\n      Open command prompt: Type netstat -a -b\n\nEither kill that service or try with different port.\nIf both not working then restart your machine.\n\nThis way i have solved this problem.","Q_Score":3,"Tags":"python-appium,appium-desktop","A_Id":58444163,"CreationDate":"2019-10-17T04:00:00.000","Title":"Could not start Appium server. It's showing [Error Starting appium server: listen EADDRINUSE 0.0.0.0:4723]","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am using Appium version V1.15.0 and have already start the server successfully with the default Host: 0.0.0.0 and Port: 4723\nBut now when i try to start the server it shows me this error \"Error Starting Appium server: listen EADDRINUSE 0.0.0.0:4723\"\nI have tried to solve this issue by changing the port but could not find any solution.\nSuggest me if you guys have any better solution.","AnswerCount":4,"Available Count":3,"Score":0.1488850336,"is_accepted":false,"ViewCount":3805,"Q_Id":58424717,"Users Score":3,"Answer":"If EADDRINUSE, Address already in use is the issue, \ndo\nps aux | grep node\nto get the process ids.\nThen:\nkill -9 PID\nDoing the -9 on kill sends a SIGKILL.","Q_Score":3,"Tags":"python-appium,appium-desktop","A_Id":60395724,"CreationDate":"2019-10-17T04:00:00.000","Title":"Could not start Appium server. It's showing [Error Starting appium server: listen EADDRINUSE 0.0.0.0:4723]","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am using Appium version V1.15.0 and have already start the server successfully with the default Host: 0.0.0.0 and Port: 4723\nBut now when i try to start the server it shows me this error \"Error Starting Appium server: listen EADDRINUSE 0.0.0.0:4723\"\nI have tried to solve this issue by changing the port but could not find any solution.\nSuggest me if you guys have any better solution.","AnswerCount":4,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":3805,"Q_Id":58424717,"Users Score":0,"Answer":"The following solution on windows worked for me\nC:\\Users\\username> taskkill \/F \/IM node.exe\nSUCCESS: The process \u201cnode.exe\u201d with PID 13992 has been terminated.","Q_Score":3,"Tags":"python-appium,appium-desktop","A_Id":71693131,"CreationDate":"2019-10-17T04:00:00.000","Title":"Could not start Appium server. It's showing [Error Starting appium server: listen EADDRINUSE 0.0.0.0:4723]","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Right now when I started coding on Odoo v13 I found that Odoo has been removed @api.one.\nWhat is the alternative of the @api.one in Odoo v13 ?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1951,"Q_Id":58426373,"Users Score":7,"Answer":"In odoo13 by default instance method will accept self as multi instance (multi-recordset).\nSo for instance method, you should remove the @api.one and @api.multi decorator from your methods.\nFor a single instance(single recordset), you still can check with self.ensure_one() or you can apply your own logic.","Q_Score":2,"Tags":"python,python-3.x,odoo","A_Id":58426561,"CreationDate":"2019-10-17T06:42:00.000","Title":"What is the alternative of @api.one in Odoo 13?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have two separate AWS Virtual Machines set up within a region (different availability zones) both are connected via WebSocket (in Python) to a different load balancer (Cloudfront) of the same host server (also hosted with AWS) and receive frequent small WebSocket payloads - every 5ms.\nNB: I do not own the host server I am merely on the receiving end.\nBoth machines are receiving the same updates and I would like to measure on which machine the updates\/payloads\/packets are arriving first\nIn essence I would like to figure out which load balancer is \"closer\" to the host and so has the least latency overhead in transmitting the signal since my application is highly latency sensitive.\nI have tried using the system clock to get timestamps of the data arrival however it is not guaranteed that the two instances have their time synced to an appropriate accuracy.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":38,"Q_Id":58431786,"Users Score":1,"Answer":"follow this.\n\n\nSend a request to the load balancer with the body of the request containing the timestamp when it was sent to the server. You can\n  easily do this using the DateTime api of your fav language.\nAfter that packet arrives to your backend server residing on your instance (can be a simple node server or a rails server), you can get\n  that request, and compare it to the current timestamp. \nYou can do this on both the servers and can easily compare which was faster.","Q_Score":0,"Tags":"python,amazon-web-services,networking,time,websocket","A_Id":58431962,"CreationDate":"2019-10-17T11:40:00.000","Title":"Determining which packet\/update arrived first between two machines","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am writing test code in Appium of an Andriod Project in python . The problem is that I am not able to access two button in two different Activity having same Id . I have tried to access the second button in this way.But none of them works. How to resolve the issue?\ndriver.find_element_by_id(\"com.myapp.testApp:id\/login[1]\").click(), driver.find_element_by_class_name(\"android.widget.Button\").click()\ndriver.find_element_by_xpath(\"(\/\/button[@id='login'])[1]\").click()\ndriver.find_element_by_xpath(\"\/\/android.widget.Button[@text='Change Password']\").click()","AnswerCount":5,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":2487,"Q_Id":58433478,"Users Score":0,"Answer":"If buttons texts are different, try by accessibility_id\ndriver.find_element_by_accessibility_id(\"Login\").click()\ndriver.find_element_by_accessibility_id(\"Change Password\").click()\nOR\nIf you are familiar with uiautomator,\ndriver.find_element_by_android_uiautomator('new UiSelector().resourceId(\"com.myapp.testApp:id\/login[1]\")')\ndriver.find_element_by_android_uiautomator('new UiSelector().resourceId(\"com.myapp.testApp:id\/login[2]\")')","Q_Score":0,"Tags":"appium,appium-android,appium-ios,python-appium,appium-desktop","A_Id":60395628,"CreationDate":"2019-10-17T13:09:00.000","Title":"How to find multiple element in appium having same id in Python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am writing test code in Appium of an Andriod Project in python . The problem is that I am not able to access two button in two different Activity having same Id . I have tried to access the second button in this way.But none of them works. How to resolve the issue?\ndriver.find_element_by_id(\"com.myapp.testApp:id\/login[1]\").click(), driver.find_element_by_class_name(\"android.widget.Button\").click()\ndriver.find_element_by_xpath(\"(\/\/button[@id='login'])[1]\").click()\ndriver.find_element_by_xpath(\"\/\/android.widget.Button[@text='Change Password']\").click()","AnswerCount":5,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":2487,"Q_Id":58433478,"Users Score":0,"Answer":"You can do link this, It will give you proper Output:\nInput is:\n\nd1 = driver.find_elements_by_id(\"com.application.zomato:id\/price\")\nitemtotalprice = d1[0].get_attribute(\"text\")\n\nHere, is my output:\n\nMandarin Oak\n\u20b9200\n\u20b9166.75","Q_Score":0,"Tags":"appium,appium-android,appium-ios,python-appium,appium-desktop","A_Id":69285758,"CreationDate":"2019-10-17T13:09:00.000","Title":"How to find multiple element in appium having same id in Python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it possible to retrieve CPU info, total database connections and memory info with django-prometheus?\nAfter installing django-prometheus to my Django project prometheus\/metrics I cannot understand is there any metrics to achieve my goals.\nOr it there another ways to do it?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":170,"Q_Id":58450410,"Users Score":0,"Answer":"try to open you exporter web page it should be on jango server. you should know the port. then you will see a list of metrics available for you, then you can go to prometheus and check configuration. Only then you can configure PromQL to build nice grafs","Q_Score":0,"Tags":"python,django,prometheus,metrics","A_Id":58517868,"CreationDate":"2019-10-18T11:56:00.000","Title":"How to retrieve metrics such as CPU loading, database connections, memory with django-prometheus","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Code:\n<input type=\"file\" accept=\"image\/png, image\/jpeg\" style=\"display: none;\">\nWhat I am trying to do:\nupload = driver.find_elements_by_xpath(\"\/\/input[@type = 'file']\")\nupload.send_keys('\/Users\/username\/Desktop\/images\/filename.jpg')\nPS : This code is not in any iframe and element can be found (I checked its attribute to be sure)\nNothing happens, I have written the same logic to upload files in other test cases and it worked.\nThanks for your help!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":96,"Q_Id":58458960,"Users Score":0,"Answer":"I was able to figure out the issue. Below the input field accepts \"jpeg and png\" and I was trying to upload \"jpg\". Once I changed the input to \"jpeg or png\" it worked.\nCode:\n<input type=\"file\" accept=\"image\/png, image\/jpeg\" style=\"display: none;\">\nWhat I was doing :\nupload.send_keys('\/Users\/username\/Desktop\/images\/filename.jpg')\nSolution : Change the file extension to jpeg or png.\nupload.send_keys('\/Users\/username\/Desktop\/images\/filename.jpeg')","Q_Score":0,"Tags":"python,selenium,file-upload","A_Id":58509726,"CreationDate":"2019-10-18T22:40:00.000","Title":"Python -> Selenium : Not able to upload the file","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it possible to have django running on the server and one application from django inter communicating with another python process say that I developed and fetching a response from it or even make it just do a particular action?\nIt can be synchronous or asynchronous; I have some idea of being asynchronous where some package like hendrix, crossbar.io or even celery can be used. But I don't understand what would be the name for this inter-communication and how should I plan the architecture for this.\nGoing around my head I have the two following situations I'm seeking a plan to be developed:\n1.\nSay I have django and an e-mail sender with the python package smtp. A user making a request to a view would make django execute my python module I developed for sending an email to a particular user (with a smpt server from google\/gmail). It could be synchronous or asynchronous.\nOR\n2\nI have django (some application) and I want it to communicate with some server I maintain; say for making this server execute some code or just fetch a file (if it is an ftp server). Is this an appropriate situation to point to the term 'microservices'? Or there is another term or workaround here?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":737,"Q_Id":58462197,"Users Score":1,"Answer":"Your first solution would be called an installable python module, just like any package you install with pip. You can have this as a separate module if you need your code to be re-usable across multiple or just future projects.\nYour second solution would be a microservice. This will require setting your small module as a service that could have a REST API to communicate with and make it do whatever you intend it to do.\nIf your question is \"what is the right approach\" then I would tell you it depends on your use case. If this is just some re-usable code that you don't want to repeat over and over through our project then just make it into a separate module. While if this is a service that you expect other built services will use and rely on, then just make it into a microservice. You can use a microframework such as Flask for easier and faster setup of your service. Otherwise, if it's just some code that you will use once and serves a single functionality on your application then just write it and keep it there.\nThere are no rules or standards on which approach should be taken. I personally judge things depending on the use-case.\nHope this helps!","Q_Score":0,"Tags":"django,python-3.x,asynchronous,server,microservices","A_Id":58462332,"CreationDate":"2019-10-19T09:20:00.000","Title":"Django communicating with another python application?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Django 3 should be released soon and it will be able to work in ASGI mode. ASGI mode seems to make Django more efficient when handling requests than in WSGI mode (more requests can be handled per time unit if I believe correctly). How is it accomplished? Is it like that Django can handle at the same time multiple requests, but most of them will be waiting on events like fetching data from a database or other IO operations?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1942,"Q_Id":58462443,"Users Score":0,"Answer":"The situation you said is because you did not use asynchronous in the whole process of your request, because in the case of using asynchronous mode, you must ensure that each link is using asynchronous, so that your request will not block in At a certain stage, it can be guaranteed that at the same time, Django asynchronous mode can handle more requests","Q_Score":3,"Tags":"python,django,asgi","A_Id":59169437,"CreationDate":"2019-10-19T09:53:00.000","Title":"What's the difference between handling requests in Django 3 ASGI mode vs WSGI mode?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am building a dynamic <div> into my (very low-traffic) website, which I want to display only some data from a memory-based SQLite database running within a Python program on the server. Being a novice in web tech, I can't decide which technologies and principles should go into this project.\nRight now, the only decided-upon technologies are Python and Apache. Python, at the very least, needs to be constantly running to fetch data from the external source, format it, and enter it into the database. Problem #1 is where this database should reside. Ideally, I would like it in RAM, since the database will update both often and around the clock. Then the question becomes, \"How does one retrieve the data?\". Note: the query will never change; I want the web page to receive the same JSON structure only with up-to-date values. From here, I see two options with the first, again, being ideal:\n1) Perform some simple \"hey someone wants the stuff\" interaction with the Python program (remember that this program will be running) whenever someone loads the page, which is responded to with the JSON data. This should be fairly easy with WebSockets, but I understand they have fallen out of favor.\n2) Have the Python program periodically create\/update an HTML file, which the page loads with jQuery. I could do this with my current knowledge, but I find it inelegant and it would be accepting several compromises such as increased disk read\/writes and possibly out-of-date data unless read\/writes are increased even further, essentially rendering the benefits from a memory database useless.\nSo, is my ideal case feasible? Can I implement an API into my Python program to listen for requests? Would the request be made with jQuery? Node.js? PHP? Maybe even with Apache? Do I bypass Python by manipulating the VFS? The techs available feel overwhelming and most online resources only detail generating HTML with Python (Django, Flask, etc.).\nThank you!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":24,"Q_Id":58475909,"Users Score":0,"Answer":"WSGI is the tech I was looking for!","Q_Score":0,"Tags":"python,html,ajax,dynamic,server","A_Id":58478172,"CreationDate":"2019-10-20T18:16:00.000","Title":"Architecture question for app which serves data from SQLite in memory","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Can we set a confirmation message for a Onchange function in Odoo. if we change a field a warning will appear If we confirm we agree the chang else we need to revert the change.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":678,"Q_Id":58496312,"Users Score":0,"Answer":"You can try creating a custom confirmation wizard or use redirect warning in onchange function to get a confirmation message.","Q_Score":1,"Tags":"python,odoo","A_Id":58496877,"CreationDate":"2019-10-22T02:24:00.000","Title":"Can we set a confirmation message for a Onchange function in Odoo","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on an OCR application. I use docker for my application. The application consists of 4 containers.\n\nConverter (Converts PDF to the image)\nCleaner (Cleans the image)\nTranscriber (Converts image to text)\nAll in One\n\nThe AllinOne container integrates all the other containers through API calls. The APIs are implemented using Flask. The AllinOne container is exposed to the server.  The workflow is as follows,\nPostman (User Request) -> AllinOne -> Convertor -> AllinOne -> Cleaner -> Allinone -> Transcriber -> Allinone -> Postman (response)\nNow, I am trying to add a feature to my application called the Bulk Upload, where users will be able to upload a .zip file. Since bulk uploads take a longer time to process, I need intermediate results about the status of the process. I have a file_id allocated for each file that is being uploaded. I need to return the file_id to the user so that they'll be able to check the status of processing for their file. But, the processing has to take place in the background.\nIf I return the file_id the processing would stop, or else the file_id would be returned only after processing of the file, which is useless. Should I implement two API calls? One for uploading the file and returns the file_id, and the other to process the file and return the result. Is there a way to send frequent updates as a response from an API? Can it be done better? Feel free to suggest any change in the architecture.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":29,"Q_Id":58517218,"Users Score":0,"Answer":"An REST-API is synchronous, but your processing does not need to be.\nYou should probably change your architecture so that your HTTP-POST just creates all necessary jobs and returns ids the user can check on later.\nWhen the user wants to get an update, he has to ask your api using the id to get the status.\nObviously, all of your containers need to support that pattern - e.g. they send asynchronous updates about the status of the processing. In my experience, rest api calls are not the best pattern for this, use something asynchronous to report the status, e.g. RabbitMq \/ kafka \/ nats.\nYour All in One container \/ or a new dedicated aggregator can then aggreagte such updates and return the status if somebody asks.","Q_Score":0,"Tags":"python-3.x,rest,docker,flask,flask-restful","A_Id":58517367,"CreationDate":"2019-10-23T07:05:00.000","Title":"How to get updates(response) from a REST API implemented using Flask? Is there any workaround if it is not possible?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have been deploying apps to Kubernetes for the last 2 years. And in my org, all our apps(especially stateless) are running in Kubernetes. I still have a fundamental question, just because very recently we found some issues with respect to our few python apps.\nInitially when we deployed, our python apps(Written in Flask and Django), we ran it using python app.py. It's known that, because of GIL, python really doesn't have support for system threads, and it will only serve one request at a time, but in case the one request is CPU heavy, it will not be able to process further requests. This is causing sometimes the health API to not work. We have observed that, at this moment, if there is a single request which is not IO and doing some operation, we will hold the CPU and cannot process another request in parallel. And since it's only doing fewer operations, we have observed there is no increase in the CPU utilization also. This has an impact on how HorizontalPodAutoscaler works, its unable to scale the pods.\nBecause of this, we started using uWSGI in our pods. So basically uWSGI can run multiple pods under the hood and handle multiple requests in parallel, and automatically spin new processes on demand. But here comes another problem, that we have seen, uwsgi is lacking speed in auto-scaling the process tocorrected serve the request and its causing HTTP 503 errors, Because of this we are unable to serve our few APIs in 100% availability. \nAt the same time our all other apps, written in nodejs, java and golang, is giving 100% availability.\nI am looking at what is the best way by which I can run a python app in 100%(99.99) availability in Kubernetes, with the following\n\n\nHaving health API and liveness API served by the app\nAn app running in Kubernetes\nIf possible without uwsgi(Single process per pod is the fundamental docker concept)\nIf with uwsgi, are there any specific config we can apply for k8s env","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":2090,"Q_Id":58534959,"Users Score":2,"Answer":"We use Twisted's WSGI server with 30 threads and it's been solid for our Django application. Keeps to a single process per pod model which more closely matches Kubernetes' expectations, as you mentioned. Yes, the GIL means only one of those 30 threads can be running Python code at time, but as with most webapps, most of those threads are blocked on I\/O (usually waiting for a response from the database) the vast majority of the time. Then run multiple replicas on top of that both for redundancy and to give you true concurrency at whatever level you need (we usually use 4-8 depending on the site traffic, some big ones are up to 16).","Q_Score":5,"Tags":"python,django,flask,kubernetes,uwsgi","A_Id":58537824,"CreationDate":"2019-10-24T05:57:00.000","Title":"Production ready Python apps on Kubernetes","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a typical Django project that uses PostgreSQL as it's database backend. I need to set up a specific endpoint (\/status\/) that works even when the connection to the database is lost. The actual code is very simple (just returns the response directly without touching the DB) but when the DB is down I still get OperationalError when calling this endpoint. This is because I use some pieces of middleware that attempt to contact the database, e.g. session middleware and  auth middleware. Is there any way to implement such \/status\/ endpoint? I could theoretically implement this as a piece of middleware and put it before any other middleware but that seems as kind of hack.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":61,"Q_Id":58541016,"Users Score":0,"Answer":"Up to my knowledge no.\nIf some Middlewares requires a database and you enabled them then they will be used for each request.\nI did not read about a way of conditionally executing middlewares depending on the request's url.\nSo up to my knowledge a normal djangoview will not be able to handle such a status page.\nThe only solution, that I can imagine is your suggestion to implement a middleware, that is handled first, shortcuts all the other middlewares and returns the result.","Q_Score":3,"Tags":"python,django","A_Id":58541424,"CreationDate":"2019-10-24T12:03:00.000","Title":"Add Django endpoint that doesn't require database connection","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using pytest-bdd and want to generate a test report where the Given, When, Then steps are clearly shown and in the case of a failure, it shows you the error. \nI have installed pytest-html and successfully created a report but it doesn't support the Given, When, Then steps.\nI have also tried outputting the report as json using the --cucumber-json option but am unsure what I can do with that. \nAllure reporting is another avenue I have explored but it requires extra decorations on steps which I would like to avoid, but maybe it is the best\/only way. \nSomething similar to the robot framework test report for example would be a great start!","AnswerCount":1,"Available Count":1,"Score":0.6640367703,"is_accepted":false,"ViewCount":1698,"Q_Id":58545137,"Users Score":4,"Answer":"Use allure-pytest-bdd==2.8.10 plugin and generate allure reports.","Q_Score":2,"Tags":"python,pytest,reporting,bdd,test-reporting","A_Id":60333188,"CreationDate":"2019-10-24T16:02:00.000","Title":"How to generate a useful pytest-bdd test report?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"For App Engine Standard the explicitly state that they do not support Pipfiles and immediately block you from pushing your project if it contains a Pipfile. In searching the documentation, I don't see anything that mentions if Pipfile is supported or not for App Engine Flex.","AnswerCount":3,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":1118,"Q_Id":58546089,"Users Score":11,"Answer":"You can just include Pipfile and Pipfile.lock in the .gcloudignore file and run pip freeze > requirements.txt after any library changes.","Q_Score":5,"Tags":"python,google-app-engine,google-cloud-platform,pipenv,app-engine-flexible","A_Id":61110829,"CreationDate":"2019-10-24T17:06:00.000","Title":"Does Google App Engine Flex support Pipfile?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a Python bot running on Heroku. When I try to read a PDF using Tabula I get this error:\n\n\u0415rror: tabula.errors.JavaNotFoundError: \"java\" command is not found from this Python process.Please ensure Java is installed and PATH is set for \"java\"\n\nWhy can't my bot find java?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1878,"Q_Id":58548093,"Users Score":0,"Answer":"To be specific on above answer mentioned by Chris, if someone still not able to solve the error I would like to mention that the link he has provided for pom.xml you need to just delete the <dependencies> tag  and <?xml version=\"1.0\" encoding=\"UTF-8\"?> this. And just add pom.xml on to your root directory.","Q_Score":1,"Tags":"python,heroku,bots","A_Id":66403658,"CreationDate":"2019-10-24T19:36:00.000","Title":"\"java not found\" when I try to read a PDF file using the Tabula library","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My project currently involves several components using either Javascript and Python \n\nNode.js server\nPython flask API server\nPython data processing scripts (numpy, pandas, etc)\nReact.js web client\nReact Native mobile client\n\nThese components share several common config values such as a database connection URI string postgresql:\/\/admin:password@localhost:5432\/foobar used by server-side components and the API server url https:\/\/api.example.com\/v1 used by client-side components.\nQuestion: Is there a best practice for sharing config files across components that uses different languages? \nFor example, \n\nShould all components (server and client side) access the same config file? If so, which format should it be in, JSON, YAML, etc? \nShould all components share a common config file (where only common config values are stored in), but also have a second config file specific to that component?\nShould all server side components share the same config file, while client side components have their own individual config files?\n\nThank you for your advices :)","AnswerCount":2,"Available Count":2,"Score":0.1973753202,"is_accepted":false,"ViewCount":208,"Q_Id":58564775,"Users Score":2,"Answer":"I\u2019d recommend using TOML. It\u2019s supported by all major languages and allows the use of comments which JSON does not.","Q_Score":1,"Tags":"javascript,python,node.js,reactjs,configuration","A_Id":58564794,"CreationDate":"2019-10-25T19:40:00.000","Title":"Sharing Config between Node.js, React.js and Python Apps","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"My project currently involves several components using either Javascript and Python \n\nNode.js server\nPython flask API server\nPython data processing scripts (numpy, pandas, etc)\nReact.js web client\nReact Native mobile client\n\nThese components share several common config values such as a database connection URI string postgresql:\/\/admin:password@localhost:5432\/foobar used by server-side components and the API server url https:\/\/api.example.com\/v1 used by client-side components.\nQuestion: Is there a best practice for sharing config files across components that uses different languages? \nFor example, \n\nShould all components (server and client side) access the same config file? If so, which format should it be in, JSON, YAML, etc? \nShould all components share a common config file (where only common config values are stored in), but also have a second config file specific to that component?\nShould all server side components share the same config file, while client side components have their own individual config files?\n\nThank you for your advices :)","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":208,"Q_Id":58564775,"Users Score":1,"Answer":"In my mind there are two main approaches you'll see in the wild. \n\nConfig file. As nc. mentioned, you could make a TOML file that all of the different tools and applications can access. This is nice since there is only one source of truth and TOML is very human readable. The cons are having to find a TOML parser for your language (imo not that difficult), and making sure the file is there when a script\/service\/whatever expects it. I've gone this route and its not that bad, you can even put the file in \"the cloud\" (NAS, shared data store, folder with broad read permissions), and have it easily accessible if you need to spin up more than one instance of a service. \nEnvironment variables. I've liked this approach lately as it is always the minimal amount of config you could possibly do and pretty much any language has facilities for accessing environment variables. Also, you don't have possibly sensitive information hanging around in a publicly accessible plain text file. \n\nFor python you would call os.environ[MY_CONFIG_NAME] and presto, you have the config info.\nBoth approaches are common and have plenty of support in almost every language.\nAs far as client, server separation. I tend to make my clients as \"dumb\" as possible and my servers as \"smart\" as possible.","Q_Score":1,"Tags":"javascript,python,node.js,reactjs,configuration","A_Id":58564906,"CreationDate":"2019-10-25T19:40:00.000","Title":"Sharing Config between Node.js, React.js and Python Apps","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"In my flask application  , we are observing very high memory and cpu consumption almost 100% CPU and memory for one of the  API call. We are using flask-rest-json api package . In our model we  have many tables like \nTABLE A - Parent \nTable B - Child of A ( table a id as FK)\nTable C - Child of B ( table C id as FK) ---> Very high Memory \/ CPU\nIn addition to above table we have many other related tables (parent - child ) also .\nTable A is like recording session which contains many videos ( Table B) which contains many images ( Table C) . So for 30 min recording session we have 30 clips of videos and then 30 * 30 = 900 images.\nWe have created relationships between tables using db.relationship so that we can use filter operations as well. \nOnce we trigger the url having high cpu \/ memory usage , wsgi process kill itself and then restart . \nPlease let me know to debug this issue . WE suspect issue in db relationships .","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1544,"Q_Id":58567440,"Users Score":0,"Answer":"Are you storing video data directly in your database as a BLOB? don't.\nif so, just store the video as a separate file in a folder, and just the path to the video in the database.\nCan't help more if you don't really say what the endpoint is doing. complex relationships may not be your issue.","Q_Score":0,"Tags":"python,flask,sqlalchemy,flask-sqlalchemy,flask-restless","A_Id":58568898,"CreationDate":"2019-10-26T01:52:00.000","Title":"flask application - 100% memory and cpu consumption","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have working application on port 8080(Django 1.6). It binds to external network interface. I would like to add one more http listener inside my Django app. E.G. one more http server on port 8000, and bind it to internal network interface only. \nIs it possible in Django?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":40,"Q_Id":58589883,"Users Score":1,"Answer":"If I have understod your use cases correctly here, my recommendation would be to run two separate Gunicorn\/Daphne (or whatever WSGI\/ASGI you use) instances and use NGINX as a proxy to serve the Django application over different ports.\nThis will create separate memory spaces for each application and also make them separate processes.\nIf you intend to increase the performance of your application, then Gunicorn workers would be what you are looking for.","Q_Score":0,"Tags":"django,multithreading,python-2.7","A_Id":58590388,"CreationDate":"2019-10-28T11:10:00.000","Title":"Start two http servers in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I just started learning Java, and I am installing the OpenJDK from Amazon Corretto. Why do I need to install this JDK? I am coming from a Python background where I only needed to install the \"Python 3\" program from the official Python website. Why can't I just install Java? I'm assuming JDK has features that aren't just in Java? What are these extra features?","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":2769,"Q_Id":58594925,"Users Score":2,"Answer":"1) The \"Python 3\" program is the Python SDK, broadly speaking\n2) Java has a separate installation for development because it is a compiled language. You need a compiler and some supporting files and classes (that is, the JDK) to develop software. But you don't need that to run Java programs, you just need the Java Runtime Environment.","Q_Score":1,"Tags":"java,python,corretto","A_Id":58594971,"CreationDate":"2019-10-28T16:38:00.000","Title":"Why do I need to install a JDK for Java but only an installer for Python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to schedule emails using Django. Example ---> I want to send registered users their shopping cart information everyday at 5:00 P.M.\nHow would I do this using Django? I have read a lot of articles on this problem but none of them have a clear and definite solution. I don't want to implement a workaround.\nWhats the proper way of implementing this? Can this be done within my Django project or do I have to use some third-party service?\nIf possible, please share some code. Otherwise, details on how I can implement this will do.","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":169,"Q_Id":58595280,"Users Score":2,"Answer":"There's no built-in way to do what you're asking.  What you could do, though, is write a management command that sends the emails off and then have a crontab entry that calls that command at 5PM (this assumes your users are in the same timezone as your server).\nAnother alternative is using celery and celery-beat to create scheduled tasks, but that would require more work to set up.","Q_Score":0,"Tags":"python,django,django-views,scheduled-tasks,django-celery","A_Id":58595816,"CreationDate":"2019-10-28T17:00:00.000","Title":"Scheduling Emails with Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to write a script that will tell me the number of views a given YouTube video has. I know that I can grab all of the existing text on a page but I am curious if there is a way to get it to only output the amount of views the video has, and how I might go about implementing that. Thanks!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":30,"Q_Id":58600774,"Users Score":1,"Answer":"requests library will only get you the page's content. You'll need HTML parse like BeautifulSoup to parse and get whatever information you need from the content.","Q_Score":0,"Tags":"python","A_Id":58600811,"CreationDate":"2019-10-29T02:37:00.000","Title":"Is there a way to search for specific text on a website using the requests library?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"When i call the below function through API;\nIn both try and except conditions I have to keep log in separate table named api.log.\nWhile the function enters in except condition, error occurs on creating record on api.log table","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":20,"Q_Id":58602087,"Users Score":0,"Answer":"It is solved by using commit function.","Q_Score":0,"Tags":"python-2.7,odoo-10","A_Id":58852385,"CreationDate":"2019-10-29T06:00:00.000","Title":"Unable to create a record in except loop of try-except odoo10","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have this code related with the download, unzip, search and upload to a AWS S3. \nI have a function to download, another to unzip, another to make the searches and another function to upload the found files; to finally call all this functions into one function. \nThe problem it's that at some point (specifically in the last function) the execution gets an error. \nThe code has 1684 lines of code, and could take even 4 hours to execute. \nIf an error is found in a function, the try\/catches guarantee the final return. \nI've tried to call every function sequentially and they work. \nIf trying to call all the functions, except the last one it still works. \nIf trying to call the last function (the upload to S3), it works. \nI believe it could be related with the RAM \nTrust me, it's huge","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":37,"Q_Id":58613422,"Users Score":1,"Answer":"Basically, my problem was solved through the creation of a \".sh\" format script that calls all the functions sequentially.","Q_Score":0,"Tags":"python,python-3.x,amazon-web-services,amazon-s3","A_Id":58718308,"CreationDate":"2019-10-29T18:28:00.000","Title":"Two functional functions when called together creates an error","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using Odoo 13 and trying to create customer programmatically with the help of res.partner but unable to create customer. Contact is creating but as a individual not as a customer. But in Odoo 12 there is a binary field customer which differentiate other contacts from customer but it is not present in Odoo 13.\nAny suggestion or better idea and any help ?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":229,"Q_Id":58620574,"Users Score":2,"Answer":"The fields were removed completely in V13. With module\/app account two new fields will be created: customer_rank and supplier_rank, which will try to representate ranks for both situations. Odoo is setting the rank on creation to 1 on customer_rank when creating from customer menu or supplier_rank from supplier menu.\nI suggest to just live with this big change or make a custom module which is getting back customer and supplier boolean fields.","Q_Score":1,"Tags":"python,odoo,programmatically,customer","A_Id":58621024,"CreationDate":"2019-10-30T07:41:00.000","Title":"How to create Customer programmatically?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I would like to ask about the auto checkout in attendance odoo, because employees often forget to check out. Thus, I would like to mark their checkout automatically.\nHow is the code and where I can insert this code?\nThank you!","AnswerCount":4,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":517,"Q_Id":58621287,"Users Score":0,"Answer":"In last update You Must Delete comment sarting with \/\/\nthen save it work fine.","Q_Score":0,"Tags":"python,odoo,time-and-attendance","A_Id":70504052,"CreationDate":"2019-10-30T08:33:00.000","Title":"Odoo 13' solution to solve about the employee forget to checkout in odoo attendance","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've written multiple unit tests using python unit test module in multiple directories\nHow to run all the tests from a single file\nI have to integrate this file to a jenkins job and am using django","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":250,"Q_Id":58626393,"Users Score":1,"Answer":"Your folders will need to contain an __init__.py file in each of them, then you should be able to instantiate the unit test runner and pass it the parent directory, unit test discovery should pick up the sub-folders automatically.","Q_Score":0,"Tags":"python,python-2.7,python-unittest","A_Id":58626505,"CreationDate":"2019-10-30T13:24:00.000","Title":"Running multiple python unit test cases which are in different directories","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a single page dashboard with 2 different slicers, one for country and the other for year I would like to export to PDF for all possible combinations of the slicer selection. Is that programmatically possible? Using R or Python or any other method. Need guidance.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":393,"Q_Id":58627728,"Users Score":0,"Answer":"This is not directly possible in the Power BI Service, or currently supported by the Power BI REST API, it would have to be manual process to do this.","Q_Score":0,"Tags":"python,r,powerbi,dax,dashboard","A_Id":58651730,"CreationDate":"2019-10-30T14:34:00.000","Title":"Export to PDF Power BI Dashboard for all slicer options","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a two tasks - a and b.\nTask a running in 5 minutes after finish previous task a.\nTask b running in 3 minutes after finish previous task b.\nHow can I implement it? I'm use python 3.6.8, Django 2.2.6 and celery 4.3.0?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":421,"Q_Id":58629790,"Users Score":0,"Answer":"The short answer is that you can't do this with celery beat because celery beat will trigger off of task start and not at task end.  If you absolutely need to do it three minutes after the previous task ends, you'd be advised to just adding a call to .apply_async at the end of both a and b and kicking off each task once.","Q_Score":1,"Tags":"python,django,python-3.x,task,celery","A_Id":58785338,"CreationDate":"2019-10-30T16:21:00.000","Title":"How can to run task in 5 minutes after finish previous task using celery-beat?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I want to know what is the difference in terms of execution in Django queryset and Django list.\nFor eg,\nList of Objects v\/s Queryset of Objects\nWill there be much difference in the execution part?\nAny Info will help as It can give a clear picture what to use and what not to use.\nThanks!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":536,"Q_Id":58638352,"Users Score":0,"Answer":"List of Objects is evaluated,\nQueryset isn't unless you perform any computation on the data. \nList of Objects will consume RAM space, Queryset won't that much.\nYou can refer Queryset further in the code without actually dealing with data in your memory, list of objects won't allow you to manipulate data that easily.\nThis is what I think, others can add to it.","Q_Score":1,"Tags":"python,django,list,django-queryset","A_Id":58638467,"CreationDate":"2019-10-31T07:08:00.000","Title":"Queryset v\/s List Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to copy files from 2 different bucket which are in two different aws account using same access key.\nSo it provide an error saying 403 forbidden.So what i want to do is, I want to check whether the access key that i am using to copy the file has permission to those bucket before i copy the file using boto3. Is there are anyway to do this?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":579,"Q_Id":58638363,"Users Score":1,"Answer":"If you are copying objects between Amazon S3 buckets that belong to different AWS accounts, then you will need to use a single set of credentials that have:\n\nGetObject permission on the source bucket\nPutObject permission on the destination bucket\n\nAlso, the CopyObject command should be sent to the destination bucket to avoid problems with object ownership.\nTherefore, I would recommend:\n\nUse credentials from the destination account (dest-IAM-user)\nAdd a bucket policy to the source bucket that permits GetObject access by dest-IAM-user","Q_Score":3,"Tags":"python,amazon-s3,boto3","A_Id":58639883,"CreationDate":"2019-10-31T07:09:00.000","Title":"How to check whether s3 access key has access to a specific bucket or not in aws using boto3","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Hi im new to django and i cant get my web server running. First of all i viewed several of other threads and ive been searching for a solution for 4 hours and i couldn't find any help.\nSo this is what ive done:\n\nInstalled django using the following \"pip install django\"\nCreated a project using \"django-admin startproject DjangoProject\"\nWent into the directory using \"cd DjangoProject\"\nInputted \"python manage.py runserver\" into the console and the console doesn't display anything.\n\nSo ive tried several of methods to solve this issue and have even set up environmental variables \n\nC:\\Python37\\scripts\nC:\\Python37\n\nAfter setting up environmental variables when i input \"python -m django --version\" or \"python manage.py runserver\" i receive an output of \"'python' is not recognised as an internal or external command,operable program or batch file.\"\nI think i haven't set up my environmental variables properly\nHave i set up my environmental variables properly? Or have i done something else wrong, I can't seem to figure out the problem. Any Help would be appreciated.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1964,"Q_Id":58661812,"Users Score":0,"Answer":"I do not see the step where you have already created and activated your virtual environment already activated\nvirtualenv name\nsource name\/bin\/activate","Q_Score":1,"Tags":"python,django,environment-variables","A_Id":58661912,"CreationDate":"2019-11-01T15:27:00.000","Title":"Django- \"python manage.py runserver\" not working","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am having issues running django tests in PyCharm Pro.\n\nI am able to run python manage.py runserver just fine.\nI am able to migrate, makemigrations, manage.py test just fine. Actually, everything with manage.py runs as expected.\n\nWhenever I run tests in PyCharm (by clicking the green run button), I get this error:\ndjango.core.exceptions.ImproperlyConfigured: Requested setting INSTALLED_APPS, but settings are not configured. You must either define the environment variable DJANGO_SETTINGS_MODULE or call settings.configure() before accessing settings.\nI have done several things to fix this:\n\nI have, in my test file, put this:\nimport os\n os.environ['DJANGO_SETTINGS_MODULE'] = 'mysite.settings' (with mysite being the correct dir I promise)\nI have a settings file and a wsgi file, and my wsgi file does set the DJANGO_SETTINGS_MODULE:\nos.environ.setdefault(\"DJANGO_SETTINGS_MODULE\", \"mysite.settings\")\napplication = get_wsgi_application()\nThe only thing that has taken me out of this error was by setting up the configuration for that test class by going to Edit Configuations -> Environment -> Environment Variables and adding the DJANGO_SETTINGS_MODULE there. This only gets me a different error:\ndjango.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet.\nPlus, I have to do this for every test class and I can't run individual tests in the class, but must rather run the entire test suite in that class. Not a good solution...\nI have manually (in the virtualenv) run export DJANGO_SETTINGS_MODULE=mysite.settings. This has not changed anything. \n\nSo, I am out of ideas and have followed all the advice I could find on SO. Is there something else I have to do in Pycharm? Again, the cmdline works fine, but I'd really rather not run tests this way - plus, I can't debug. \nEdit: It may be worth noting that I am running the unit tests while my server is  running (this should not make a difference), and I am also have the python interpreter pointed to the one in my virtualenv.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":586,"Q_Id":58675355,"Users Score":1,"Answer":"Try to open the Run\/Debug Configuration window (you should find it in the top toolbar, clicking the dropdown menu near the play \/ debug button and Edit Configuration)\nFrom here, you should see a list with the existing saved configurations where the last element should be Templates. Search Django tests under Templates. In the environment part, add DJANGO_SETTINGS_MODULE=mysite.settings to the environment variables. The next time you'll run a test that is not existing in your run\/debug configurations, the template with the setting module set will be used.\nIf I were you, I will delete all the existing test configurations. Also, I suspect from your point 3, that you have probably a python test configured instead of a Django test (this is why you had the error django.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet because Django was not loaded). If you have it, delete it too. Apply the configurations and retry to run the test.\nWhen you run the test, ensure that a Django test is run, not a python one (you should see the Django logo near the test name in the run section and in the dropdown in the toolbar)","Q_Score":1,"Tags":"python,django,pycharm,django-testing,django-tests","A_Id":58929656,"CreationDate":"2019-11-02T21:12:00.000","Title":"How can run django tests in Pycharm Pro, getting ImproperlyConfigured and AppRegistryNotReady errors","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Does aubio have a way to detect sections of a piece of audio that lack tonal elements -- rhythm only? I tested a piece of music that has 16 seconds of rhythm at the start, but all the aubiopitch and aubionotes algorithms seemed to detect tonality during the rhythmic section. Could it be tuned somehow to distinguish tonal from non-tonal onsets? Or is there a related library that can do this?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":64,"Q_Id":58675412,"Users Score":0,"Answer":"Use a spectrum analyser to detect sections with high amplitude. If you program - you could take each section and make an average of the freqencies (and amplitudes) present to give you an idea of the instrument(s) involved in creating that amplitude peak.\nHope that helps - if you're using python I could give you some pointers how to program this!?\nRegards\nTony","Q_Score":1,"Tags":"python,signal-processing,pitch-tracking,aubio","A_Id":58806389,"CreationDate":"2019-11-02T21:21:00.000","Title":"Can aubio be used to detect rhythm-only segments?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Which one is more suitable for my project? I want to build a human gesture mimicking Robotic arm. The application is to be built using an open source PYNQ framework. It requires me to choose either one of the kits Ultra96 or PYNQ-Z2 kit for my project so that they can provide me with it. I am unable to find the exact difference between the functionalities of the two, and when to use which? Please help me.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":127,"Q_Id":58681419,"Users Score":0,"Answer":"I have been using the Z2 board and it would seem to work just fine for your project. Although I can't speak for the ultra96 it's worth noting that it is a community board and so is not officially supported by Pynq.","Q_Score":0,"Tags":"python,arm,iot,robotics","A_Id":61090911,"CreationDate":"2019-11-03T15:02:00.000","Title":"Ultra96 or Pynq-Z2 kit?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"What is the difference between django-admin startapp and python manage.py startapp? They both create apps and the files are also same so what's the difference between these two?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":3227,"Q_Id":58684021,"Users Score":0,"Answer":"There is no difference. manage.py is meant for the project and comes preconfigured with project-settings.","Q_Score":5,"Tags":"python,django,django-admin,django-apps,django-admin-actions","A_Id":58684039,"CreationDate":"2019-11-03T19:49:00.000","Title":"django-admin startapp v\/s python manage.py startapp","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm training a keras deep learning model with 3 fold cross validation. For every fold I'm receiving a best performing model and in the end my algorithm is giving out the combined score of the three best models.\nMy question now is, if there is a possibility to combine the 3 models in the end or if it would be a legit solution to just take the best performing model of those 3 models?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":415,"Q_Id":58691535,"Users Score":1,"Answer":"A (more) correct reflection of your performance on your dataset would be to average the N fold-results on your validation set.\nAs per the three resulting models, you can have an average prediction (voting ensemble) for a new data point. In other words, whenever a new data point arrives, predict with all your three models and average the results.\nPlease note a very important thing: The purpose of K-fold cross-validation is model checking, not model building. By using K-fold cross-validation you ensure that when you randomly split your data, say in an 80-20 percent fashion, you do not create a very easy test set. Creating a very easy test set would lead the developer to consider that he\/she has a very good model, and when subjected to test data the model would perform much worse.\nIn essence and eventually, what you would want to do is to take all the data that you are using for both train and test and using it only for training.","Q_Score":1,"Tags":"python,keras,scikit-learn,deep-learning,cross-validation","A_Id":58692931,"CreationDate":"2019-11-04T10:30:00.000","Title":"How can deep learning models found via cross validation be combined?","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Brief intro of the app: \n\nI'm working on MLM Webapp and want to make payment on every 15th and last day of every month.\nCalculation effect for every user when a new user comes into the system.\n\nWhat I did [ research ]\n\nusing django crontab extension\ncelery\n\nQuestion is:\n-- Concern about the database insertion\/update query:\n\non the 15th-day hundreds of row generating with income calculation for users. so is there any better option to do that?\nhow to observe missed and failed query transaction?\n\nPlease guide me, how to do this with django, Thanks to everyone!","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":34,"Q_Id":58706475,"Users Score":0,"Answer":"For your 1st question, i don't think there will be any issue if you're using celery and celery beat for scheduling this task. Assuming your production server has 2 cores (so 4 threads hopefully), you can configure your celery worker (not the beat scheduler) to run using 1 worker with 1\/2 thread. At the 15th of a month, beat will see that a task is due and will call your celery worker to accomplish this task. While doing this your worker will be using 1 thread and the other threads will be open (so your server won't go down). There are different ways to configure your celery worker depending on your use case (e.g. using gevent rather than regular thread), but the basic config should be fine.\nWell I think you should keep a column in your table to track which ones were successfully handled by your code, and which failed. Celery dashboards will only show if total work succeeded or not, and won't give any further insights.\nHope this helps!","Q_Score":0,"Tags":"django,python-3.x,web-applications,logic","A_Id":58711413,"CreationDate":"2019-11-05T07:32:00.000","Title":"Is there any built-in functionality in django to call a method on a specific day of the month?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Siteimprove which is a software that looks through a website and recommends accessibility changes. I'm supposed to go through and edit the html of the pages to improve the Siteimprove score. \nI'm supposed to add a language attribute to all 143 pages and I was thinking I could write a simple script to go through every html page and replace <html> with <html\u00a0lang=\"en-US\"> instead of manually do this. \nI haven't done this before so I was thinking to make a copy and test a script (I have yet to write). Do you know where I should look for examples to write such a script that would basically say:\n\"For every file in directory named .html, if it contains <html> replace <html> with <html\u00a0lang=\"en-US\">\" \nOr if I should edit my logic statement above? I'm a student worker and don't want to mess this up.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":174,"Q_Id":58715482,"Users Score":0,"Answer":"Thanks you to those who left comments, I didn't realize replaceAll was an option in VSCode, much easier solution!","Q_Score":0,"Tags":"python,html,automation","A_Id":58717997,"CreationDate":"2019-11-05T16:22:00.000","Title":"Automating a text change on every html page of a website","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"One of data sources I extract data from provides access through REST API in form of JSON responses. That's great, because I get data already structured, i.e., less pain with scraping and parsing unstructured HTML documents. \nHowever, they constrain HTTP traffic with rate limiting: requests per minutes\/hour\/month\/IP\/user email.\nWhen I was scraping HTML documents with Scrapy I could easily configure number of requests per second, delays between subsequent requests, number of threads, etc. I will call it \"load strategy\". The way it works in Scrapy under the hood, is that I generate a number of HTTP requests that Scrapy puts into the queue, and process requests from the queue with respect to the given \"load strategy\".\nIs there something like that for REST APIs? \nTo give some context, I'm using Python REST client generated from data source Swagger definitions. The client uses urlib3 under the hood. The client provides a way to execute requests in an asynchronous way and a way to configure a thread pool but it looks like I would need to play a bit around to configure it. I'm looking for out-of-the-box solution.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":116,"Q_Id":58717607,"Users Score":1,"Answer":"With a generated client you will be able to make requests to the corresponding REST API. However, you'll need to build your own code\/logic for inserting delays between requests and request queuing. Much of the convenience that Scrapy is providing for you will need to be implemented by you. Or you'll need to find tools\/package that will provide this functionality for you.","Q_Score":0,"Tags":"python","A_Id":58717737,"CreationDate":"2019-11-05T18:43:00.000","Title":"Scheduling \"scraping\" of data from REST APIs","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I currently need to work on a flask project, to do that, I need to activate a virtual environment for my project. Virtual environment has already been installed at Python37\\Scripts folder, but each time I want to activate the virtual environment by running C:\\Users\\user\\Desktop\\flask-intro\\venv\\Scripts>activate. <flask-intro is my project folder>. I get an error that says 'activate' is not recognized as an internal or external command, operable program, or batch file. What could be the issue.","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":506,"Q_Id":58723036,"Users Score":2,"Answer":"To Create and activate a Virtual Env for project on windows, navigate to your project directory on your command line window and run the following commands\n\n\nTo create - python -m venv your-env-name\nTo activate - your-env-name\\Scripts\\activate.bat","Q_Score":0,"Tags":"python,python-3.x,windows,flask,virtualenv","A_Id":58725343,"CreationDate":"2019-11-06T04:18:00.000","Title":"How do I activate a virtual environment in Windows 7","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm developing something like an API (more like a communications server? Idk what to call it!) to receive data from a POST message from an external app. Basically this other app will encounter an error, then it sends an error ID in a post message to my API, then I send off an email to the affected account. \nMy question is how do I handle this in Django without any form of UI or forms? I want this to pretty much be done quietly in the background. At most a confirmation screen that the email is sent.\nI'm using a LAMP stack with Python\/Django instead of PHP.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":250,"Q_Id":58744425,"Users Score":1,"Answer":"A Django view doesn't have to use a form. Everything that was POSTed is there in request.POST which you may access directly. (I commonly do this to see which of multiple submit buttons was clicked).  \nForms are a good framework for validating the data that was POSTed, but you don't have to use their abilities to generate content for rendering. If the data is validated in the front-end, you can use the form validation framework to check against front-end coding errors and malicious POSTs not from your web page, and simply process the cleaned_data if form.is_valid() and do \"Something went wrong\" if it didn't (which you believe to be impossible, modulo front-end bugs or malice).","Q_Score":0,"Tags":"python,django,apache,post,lamp","A_Id":58747204,"CreationDate":"2019-11-07T08:11:00.000","Title":"Retrieving information from a POST without forms in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"on pyfpdf documentation it is said that it is possible to specify a format while adding a page (fpdf.add_page(orientation = '', format = '', same = False)) but it gives me an error when specifying a format.\nerror:\n\npdf.add_page(format = (1000,100)) TypeError: add_page() got an\n  unexpected keyword argument 'format'\n\ni've installed pyfpdf via pip install and setup.py install but it doesnt work in both ways\nhow can i solve this?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":1170,"Q_Id":58744527,"Users Score":1,"Answer":"Your problem is that two packages of pypdf exist, fpdf and fpdf2. They both use from fpdf import FPDF, but only fpdf2 has also a format= keyword in the add_page() method.\nSo you need to install the fpdf2 package.","Q_Score":2,"Tags":"python-3.x,pdf,fpdf","A_Id":72024404,"CreationDate":"2019-11-07T08:18:00.000","Title":"PyFPDF can't add page while specifying the size","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"How do I redeploy an updated version of the Flask web app in Google App Engine.\nFor example, I have running web app and now there are new features added into it and needs redeployment. How can I do that?\nAlso how to remove the previous version.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":111,"Q_Id":58754736,"Users Score":0,"Answer":"Add --no-promote if you want to deploy without routing service to the latest version deployed.","Q_Score":1,"Tags":"google-app-engine,google-cloud-platform,google-app-engine-python","A_Id":58758010,"CreationDate":"2019-11-07T18:11:00.000","Title":"Redeploying a Flask app in Google App Engine","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm making a notes creator web application in django and I want to save the date and time when a note is created. (i.e. save date and time as soon as 'Submit' button is clicked.) What could be the django statement to do the same ?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":218,"Q_Id":58786181,"Users Score":1,"Answer":"Inside your model class, add this:created_at = models.DateTimeField(auto_now_add=True)It assigns current time when object is created.You can retrieve that data in html file by using:\n{{ object.created_at }}","Q_Score":0,"Tags":"python,django","A_Id":58786284,"CreationDate":"2019-11-10T06:07:00.000","Title":"Django statement to save date and time when a button is clicked","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to Django. I am using Python 3.7 with Django 2.2.6.\nMy Django development environment is as the below.\n\nI am using Microsoft Visual Studio Code on a Windows 8.1 computer\nTo give the commands I am using 'DOS Command Prompt' & 'Terminal window' in \nVS Code.\nCreated a virtual environment named myDjango\nCreated a project in the virtual environment named firstProject\nCreated an app named firstApp.\n\nAt the first time I could run the project using >python manage.py runserver\nThen I had to restart my computer.\n\nI was able to go inside the previously created virtual environment using\nworkon myDjango command.\n\nBut my problem is I don't know how to go inside the previously created project 'firstProject' and app 'firstApp' using the 'Command prompt' or using the 'VSCode Terminal window'\nThanks and regards,\nChiranthaka","AnswerCount":3,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2450,"Q_Id":58787889,"Users Score":1,"Answer":"Simply navigate to the folder containing the app you want to manage using the command prompt.\nThe first cd should contain your parent folder.\nThe second cd should contain the folder that has your current project.\nThe third cd should be the specific app you want to work on.\nAfter that, you can use the python manage.py to keep working on your app.","Q_Score":0,"Tags":"python,django,python-3.x","A_Id":68031245,"CreationDate":"2019-11-10T10:49:00.000","Title":"How to run previously created Django Project","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am following the book explore flask on explore flask site, I am getting this error, I just installed flask-login and import this as following\npip install flask-login\nfrom flask_login import login_required\nI expect to save this normally without any errors, but VS CODE terminal show this error\n\"Unable to import 'flask_login'","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":4162,"Q_Id":58793101,"Users Score":1,"Answer":"First, make sure that flask_login was installed successfully by running \"pip list\" in your project directory terminal, If it isn't there then you should install it again \nSecond, if it is there so make sure of any typo mistakes, also you can share that piece of code to check it.","Q_Score":1,"Tags":"python,flask,flask-login","A_Id":58793677,"CreationDate":"2019-11-10T21:30:00.000","Title":"Unable to import flask_login","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Having multiple languages to deploy under appengine; I wonder if some kind of private approach could be applied; in order to have it all resides only under a single domain\nFor example, given xyz.com domain setup as wildcard; having a default service, services svc1 and svc2; and a dispatch.yaml mapping *\/svc1\/* to svc1 service and *\/svc2* to svc2 service; how to :\n\nhide all the *.appspot domain ?\nhide the automatic setup of svc1.xyz.com and    svc2.xyz.com ?\n\nIt could be easy for a given service to check the host and redirect to the desired one; but it would have to be done for every services; feels like there a better way\nIt feels a bit messy to have all those auto enopoints opened and unused, the idea would be to have it all under xyz.com\/\n\n-","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":45,"Q_Id":58797322,"Users Score":1,"Answer":"There is no way of hiding all the routes of the .appspot domain. As you probably are aware the dispatch.yaml, only works as a redirect. Probably, you cannot just disable the default domain, since there are a lot of tools like Cloud Tasks, Cron Jobs etc.. that uses that default domain, hitting those endopoints.\nAs for the second question, you cannot hide them, but in case you don't need them, you can overwrite them in the dispatch.yaml to point to some custom made \"not found\" page.","Q_Score":0,"Tags":"google-app-engine,google-app-engine-python,google-appengine-node","A_Id":58798896,"CreationDate":"2019-11-11T07:44:00.000","Title":"Appengine \/ restrict services to only be available under a single domain","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"It is not disabled by default.\nI have written a spider which consumes almost 2 GB of data per hour. Now I want to save my data consumption, images are of no use for me, so want to make sure they not being fetched.\nGiven that this is a P0 scenario, it should be a simple flag in settings.py but surprisingly from docs I couldn't find any. I found a lot of details about ImagesPipeline, enabling those pipelines, their storage etc, but no flag for people not interested in images. Let me know if I am missing anything.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":492,"Q_Id":58801190,"Users Score":1,"Answer":"Scrapy does not download images unless you explicitly tell it to do it.\nYou can check in the run time logs the URLs that Scrapy downloads. If a image URL does not appear in the logs, it is not being downloaded, even if a webpage that contains images is downloaded.\nWhen you open a downloaded page in a web browser, images are downloaded on the fly by the web browser. They do not come from the downloaded webpage, they are not (usually) embedded in the webpage, the webpage indicates where in the Internet they are, and the web browser downloads them to display them, but Scrapy does not.\nThe only exception would be that images are actually embedded in the HTML code, as base64. This is uncommon, and probably not your case. And when that happens, there is no way you can prevent their download, you cannot download a webpage excluding part of its content.","Q_Score":0,"Tags":"python,python-3.x,web-scraping,scrapy","A_Id":58814419,"CreationDate":"2019-11-11T12:17:00.000","Title":"What's the best way to disable image download in scrapy?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Can anyone please help me how to open a URL in Chrome browser in Icognito mode, as the URL that i'm trying to open in chrome is giving 404 error but is opening successfully in Icognito.\nPlease guide me what Robot command should be given to open in Icognito mode.\nThank you.","AnswerCount":3,"Available Count":1,"Score":0.0665680765,"is_accepted":false,"ViewCount":2692,"Q_Id":58801529,"Users Score":1,"Answer":"This should work:\nOpen Browser  |  ${url}  |  Chrome  |  options=add_argument(\"--incognito\")","Q_Score":0,"Tags":"python-2.7,browser,robotframework","A_Id":67016997,"CreationDate":"2019-11-11T12:38:00.000","Title":"How can we open a URL in Chrome Icognito mode using Robot Framework","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Input form in Flask, WTForms, SQLite, TinyMCE.\nThe textarea is replaced by TinyMCE, text entered f.e as paragraph, input saved into SQLite db.\nWhen the entered data is displayed on a page, it renders as <p>Text entered<\/p> instead of just Text entered\nI've tried setting {{ wtf.quick_form(form)|save }} so the content isn't escaped, and verify_html: false, in the TinyMCE script, but to no avail..\nIs there any way to make it so that the entered text is displayed correctly?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":58,"Q_Id":58803638,"Users Score":0,"Answer":"Again, nevermind! I was adding the |save parameter to the wrong function..\nWhat I needed to do was to add to the function that displays the entered text, not on the form generator...\nWhat I did: {{ post.text|safe }}","Q_Score":0,"Tags":"python-3.x,flask,tinymce,jinja2,flask-wtforms","A_Id":58803791,"CreationDate":"2019-11-11T14:48:00.000","Title":"tinymce saves f.e paragraph with inserted text as html, and that renders back as escaped html tag on load from sqlite db in textarea form","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My question may be silly, and I am no expert. What am trying to do is to manipulate the JSON generated by django.core.serializers.serialize .\nI'v searched the web to try and find how to serialize some picked fields in my Model.\nThere is a an argument fields that takes an array of what I want to serialize, but what do I do if I want to add some calculated field that is not stored in the DB?\nI've searched a lot with no results, maybe there is something like a method or a class I don't know of yet that may solve it?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":25,"Q_Id":58804217,"Users Score":0,"Answer":"This is just a work around ,I'v managed to use model_to_dict to get a dict object then manipulate it as i want then json.dumps to convert it .\nAm not worried about deserialization as i can manage to do so as in the serialization but however am only doing this so i can get forward in my app , and this is a silly work around , so am not accepting it as an answer ,still waiting for the experts for some more robust solution.","Q_Score":1,"Tags":"python,django,serialization,django-models","A_Id":58809918,"CreationDate":"2019-11-11T15:26:00.000","Title":"Adding none DB fields model to the django serialized JSON","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How can I change the default directory in Spyder when opening a project via Projects > Open Project? Spyder seems to open always the same directory: User Home directory.\nMost of my projects are located in one directory, which is not my home directory. I save there also the copied projects. It would save a few clicks to open a project. In particular, it is nice to have because the number of Recent Projects is limited to 10.\nI tried to change Preferences > Current working directory > the following directory, but this does not have any impact on the Open Project directory.\nIs there a possibility to change it either in GUI, or via configuration files, or registry (without changing the user home directory of course)?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":151,"Q_Id":58804373,"Users Score":0,"Answer":"I put a shortcut in my home directory called _shortcut_to_spyder_projects to get to my projects faster.  The leading _ keeps it at the top of the list.","Q_Score":0,"Tags":"python,user-interface,project,spyder","A_Id":68922628,"CreationDate":"2019-11-11T15:35:00.000","Title":"How to change the default directory for Open Project menu in Spyder?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was making a subscription payment system from scratch in python in Django. I am using celery-beat for a scheduled task with RabbitMQ as a queue broker. django_celery_beat uses DatabaseScheduler which is causing problems.\n\nTakes a long time to dispatch simple-task to the broker. I was using it to expire users. For some expiration tasks, it took around 60 secs - 150secs. But normally it used to take 100ms to 500ms.\nAnother problem is that, while I re-schedule some task, while it is being written into the database it blocks the scheduler for some bizarre reason and multiple tasks are missed because of that.\n\nI have been looking into Apache Airflow because it is marketed as an industry-standard scheduling solution.\nBut I don't think, it is applicable and feasible for my small project.\nIf you have worked and played with a subscription payment system, can you advise me how to go forward with this?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":70,"Q_Id":58812247,"Users Score":0,"Answer":"I have a long winding solution that I implemented for a similar project.\n\nFirst I save the schedule as a model in the database\nNext I have a cron job that gets the entries that need to be run for that day\nThen schedule those jobs as normal Celery jobs by setting the ETA based on the time set in the schedule model.\n\nThis way Celery just runs off the messages from Redis in my case. Try it if don't get a direct answer.","Q_Score":0,"Tags":"python,django,scheduling,subscription,celerybeat","A_Id":58812430,"CreationDate":"2019-11-12T04:54:00.000","Title":"Is there a dynamic scheduling system for better implementation of a subscription based payment system?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I develop in Djangon \/ Python recently and use until now Sublime Text.\nI would like to go to a more complete idea (console, debug, etc ...)\nso I installed VS Code but when I open a project Django \/ Python I have the error below when I wanted to install the python extension but I had the error below:\n\nThe environment variable 'Path' seems to have some paths containing the '\"' character. The existence of such a character is known to have caused the Python extension to not load. If the extension fails to load please modify your paths to remove this '\"' character.\n\nwhen I look at the PATH environment variable I do not see quotes but 2 lines:\n\n%USERPROFILE%\\AppData\\Local\\Microsoft\\WindowsApps;C:\\Program Files\\PostgreSQL\\11\\bin;C:\\Program Files\\PostgreSQL\\11\\lib;C:\\Program Files\\Sublime Text 3;C:\\Users\\jl3.PRT-063\\AppData\\Local\\Programs\\Python\\Python37-32\\Scripts;\nC:\\Users\\jl3.PRT-063\\AppData\\Local\\Programs\\Microsoft VS Code\\bin\n\nI decided to followed the tutorial VS Code Python and actually when I run the program \"Hello world!\" I have the error message below:\n\n[Running] python -u \"c:\\Users\\jl3.PRT-063\\hello\\hello.py\"\n'python' Is not recognized as an internal or external command operable program or batch file in Python?\n\nWhen I run my django project with windows console, I use py instead of python... I don't know why and if it is me that set this VS Code use python...\nmaybe it is the origin of the problem\nCan anyone help me please?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":816,"Q_Id":58818634,"Users Score":0,"Answer":"You are actually executing code using Code Runner, not the Python extension (you can tell by the [Running] bit). If you would like the Python extension to do the execution then either disable Code Runner for your Python workspace or uninstall it.","Q_Score":0,"Tags":"python,django,visual-studio-code","A_Id":58828914,"CreationDate":"2019-11-12T12:20:00.000","Title":"python can't load on VS Code","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to customise the functions that process the results of completing the flask-user registration and login forms. I know how to customise the html forms themselves, but I want to change how flask-user performs the registration process. For example, I want to prevent the flask-user login and registration process from creating flash messages and I want registration to process a referral code.\nI understand how to add an _after_registration_hook to perform actions after the registration function has completed, but, this doesn't allow me to remove the flash messages that are created in the login and registration processes.\nMy custom login and registration processes would build on the existing flask-user login and registration functions with functionality added or removed.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":281,"Q_Id":58819180,"Users Score":0,"Answer":"You seem to be asking about the flask-user package - however you tagged this with flask-security (which is a different package but offers similar functionality). I can answer for flask-security-too (my fork of the original flask-security) - if you are\/want to use flask-user - it might be useful to change your tags.\nIn a nutshell - for flask-security - you can turn off ALL flashes with a config variable.\nFor registration - you can easily override the form and add a referral code - and validate\/process that as part of form validation.","Q_Score":0,"Tags":"python,authentication,flask,flask-login,flask-security","A_Id":58830619,"CreationDate":"2019-11-12T12:52:00.000","Title":"How do I customise the flask-user registration and login functions?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In the cmd , after receiving my Ipv4 address using ipconfig , I have added it to the ALLOWED_HOSTS in the settings.py file . \nThen to run the website , in cmd I ran the following command : \npython manage.py runserver 192.168.x.x:8000 where 192.168.x.x is my ipaddress . \nI am able to to access my website from my own local machine , however on other local machines : 192.168.x.x:8000\/ isn't responding.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":43,"Q_Id":58822626,"Users Score":0,"Answer":"Aemie, \nTry hosting the django server on 0.0.0.0:8000 and attempt to access it from the different machine via the address 192.168.x.x:8000 (the ip address of the host machine IP).\n0.0.0.0 would allow all IPv4 addresses on the local machine to be accessible","Q_Score":0,"Tags":"python,django","A_Id":58822736,"CreationDate":"2019-11-12T16:16:00.000","Title":"How to access Django based website from different local machines?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In the cmd , after receiving my Ipv4 address using ipconfig , I have added it to the ALLOWED_HOSTS in the settings.py file . \nThen to run the website , in cmd I ran the following command : \npython manage.py runserver 192.168.x.x:8000 where 192.168.x.x is my ipaddress . \nI am able to to access my website from my own local machine , however on other local machines : 192.168.x.x:8000\/ isn't responding.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":43,"Q_Id":58822626,"Users Score":0,"Answer":"I fear, there is rather a fundamental misunderstanding of a local webserver. The webserver created when you run python manage.py runserver is just a programme running on your computer. You can make requests against that server in your browser using the address manage.py gives you, but that does not mean that the web server was on the internet. \nWhat you expect is like having a Python script hello_world.py on your machine and expecting that someone else could just run python hello_world.py on their machine and it would invoke the script on your machine.\nIf you want to publish your website, you need to host it on a website.","Q_Score":0,"Tags":"python,django","A_Id":58822711,"CreationDate":"2019-11-12T16:16:00.000","Title":"How to access Django based website from different local machines?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am running this inside a virtual environment. \nWhen I type: \npip install django \nI get:\n\nERROR: Could not install packages due to an EnvironmentError: [Errno\n  13] Permission denied: \/home\/ENV\/env\/lib\/python3.5\/site-packages\/pytz\n  Consider using the --user option or check the permissions.\n\nFor it to work I actually need to input:\npython -m pip install --user django \nWhy?","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1086,"Q_Id":58831133,"Users Score":0,"Answer":"The error basically states that you do not have permissions to write files to your machine, So ff you are a root user(or admin) you can always install python packages with \nsudo pip install django\nOr \npip install --user django\n--user makes pip install packages in your home directory instead, which doesn't require any special privileges.","Q_Score":3,"Tags":"python,python-3.x,pip","A_Id":58831956,"CreationDate":"2019-11-13T06:00:00.000","Title":"Why my pip installations requires python -m install --user?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to automate downloading of certain csv files from a website.\nThis is how I manually do it:\n\nI log in to the website.\nClick on the button export as csv.\nThe file gets downloaded. \n\nThe problem is the button does not have any link to it so I was not able to automate it using wget or requests.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":434,"Q_Id":58836664,"Users Score":0,"Answer":"You can use selenium in python. There is an option to click using \"link text\" or \"partial link text\". It is quite easy and efficient.\ndriver.findElement(By.linkText(\"click here\")).click()\nIt kind of looks like this.","Q_Score":0,"Tags":"python-3.x,python-requests,wget","A_Id":61072914,"CreationDate":"2019-11-13T11:59:00.000","Title":"Automate downloading of certain csv files from a website","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have been working on a project built with Django. When I run profiler due to slowness of a page in project, this was a line of the result:\n\n10    0.503    0.050    0.503    0.050 {method 'recv_into' of '_socket.socket' objects}\n\nWhich says almost 99% of passed time was for the method recv_into(). After some research, I learned the reason is Nagel's algorithm which targets to send packets only when the buffer is full or there are no more packets to transmit. I know I have to disable this algorithm and use TCP_NODELAY but I don't know how, also it should only affect this Django project.\nAny help would be much appreciated.","AnswerCount":4,"Available Count":1,"Score":-0.049958375,"is_accepted":false,"ViewCount":373,"Q_Id":58837801,"Users Score":-1,"Answer":"Are you using cache settings in the settings.py file? Please check that maybe you have tcp_nodelay enable there, if so then remove it or try to clear browser cache.","Q_Score":5,"Tags":"python,django,tcp","A_Id":58838050,"CreationDate":"2019-11-13T13:05:00.000","Title":"Is there a way to change TCP settings for Django project?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using the python gspread library to get information off of google sheets. I have had no prior problems accessing any sheets but one sheet keeps throwing this error with doc.worksheet(\"{worksheet_name}\") or doc.worksheets():\ngspread.exceptions.APIError: {\n  \"error\": {\n    \"code\": 500,\n    \"message\": \"Internal error encountered.\",\n    \"status\": \"INTERNAL\"\n  }\n}\nI have ruled out the following possible causes:\n\nprogram doesn't have access to the doc\ntoo many worksheets in the doc\nover api limit\n\nI even created a copy of the doc and tried to access that and the same error occurred.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2282,"Q_Id":58867054,"Users Score":0,"Answer":"Well, I had the same error. I just created another spreadsheet and it worked.","Q_Score":0,"Tags":"python-3.x,google-sheets,google-sheets-api,gspread","A_Id":59144886,"CreationDate":"2019-11-14T21:50:00.000","Title":"gspread.exceptions.APIError error code 500","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am writing a python code which writes a hyperlink into a excel file.This hyperlink should open in a specific page in a pdf document.\nI am trying something like\nWorksheet.write_url('A1',\"C:\/Users\/.....\/mypdf#page=3\") but this doesn't work.Please let me know how this can be done.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":404,"Q_Id":58871922,"Users Score":1,"Answer":"Are you able to open the pdf file directly to a specific page even without xlsxwriter? I can not.\nFrom Adobe's official site:\n\nTo target an HTML link to a specific page in a PDF file, add\n  #page=[page number] to the end of the link's URL.\nFor example, this HTML tag opens page 4 of a PDF file named\n  myfile.pdf:\n\nNote: If you use UNC server locations (\\servername\\folder) in a link,\n  set the link to open to a set destination using the procedure in the\n  following section. \nIf you use URLs containing local hard drive addresses (c:\\folder), you cannot link to page numbers or set destinations.","Q_Score":0,"Tags":"python,excel,pdf,xlsxwriter","A_Id":59052912,"CreationDate":"2019-11-15T07:07:00.000","Title":"How do I link to a specific page of a PDF document inside a cell in Excel?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to make a wx.html2.WebView high enough that its contents don't need to be scrolled.\nI tried using javascript in RunScript to detect that document height is larger than window height, but it won't work on some backends, for which RunScript does not return results.\nCan I detect scrollbars on the WebView from Python to adapt the height ? Is there another way ?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":78,"Q_Id":58884535,"Users Score":0,"Answer":"I found a hack that works : I inject javascript that on document load navigates to \"size:\"+document.body.scrollHeight\nThen, I bind to the event EVT_WEBVIEW_NAVIGATING, veto it and use the URL from the event to get the height and set the WebView height to it.","Q_Score":0,"Tags":"python,wxpython,wx.html2","A_Id":58888256,"CreationDate":"2019-11-15T20:55:00.000","Title":"How to adapt the height of a wx.html2.WebView to its contents?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to Python and Django and want to install mysqlclient on windows. When I use the command pip install django mysqlclient in cmd it throws this error : \n\nFile \"d:\\myprojects\\python\\mytestdjangoprj\\myproject\\lib\\genericpath.py\", line 30, in isfile\n          st = os.stat(path)\n      TypeError: stat: path should be string, bytes, os.PathLike or integer, not NoneType\n\nPlease help me.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":562,"Q_Id":58888555,"Users Score":2,"Answer":"As Alasdair said , using 64 bit solve problem.thanks Alasdair.","Q_Score":2,"Tags":"python,mysql,django,windows","A_Id":58889819,"CreationDate":"2019-11-16T07:31:00.000","Title":"pip install django mysqlclient 'path should be string, bytes, os.PathLike or integer, not NoneType' on windows","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm getting this error anytime when creating a new project in pycharm:\n\nCannot run program \"C:\\Program\n  Files\\WindowsApps\\PythonSoftwareFoundation.Python.3.8_3.8.240.0_x64__qbz5n2kfra8p0\\python.exe\"\n  (in directory \"C:\\Program\n  Files\\WindowsApps\\PythonSoftwareFoundation.Python.3.8_3.8.240.0_x64__qbz5n2kfra8p0\"):\n  CreateProcess error=5, Access is denied\n\nI have Python 3.8 installed from Windows Store but when I try to create the project it says \"Choose another SDK\"\nIt seems like a fairly common issue but since I'm new to Python I'm not really sure what it involves.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1489,"Q_Id":58892354,"Users Score":0,"Answer":"Try installing Python 3 from the actual Python Webpage. \nThe windows store version may be confusing pycharm by storing\/sorting the .py files in an odd way. Could also be a PATH issue due to windows store version etc.\nHope this helps!","Q_Score":0,"Tags":"python,django,pycharm","A_Id":58892435,"CreationDate":"2019-11-16T15:37:00.000","Title":"Cannot run program \"\/..\/..\/python.exe\" (in directory \"\/PythonSoftwareFoundation.Python.3.8_3.8.240.0_x64__qbz5n2kfra8p0\"):Access is denied","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using azureml-sdk behind a corporate's proxy and therefore forced to manually add the proxy's certificate to the list of trusted hosts. It works fine by manually append the server certificate to the file \"cert_ca.pem\" of the package certifi. \nAs mentioned in the documentation of python-requests, this should also be possible by setting the environment variable \"REQUESTS_CA_BUNDLE\" to a specific file. However, the environment variable seems to be ignored by azureml-sdk. Is this the correct behavior? Or how is it possible to specify an own \"pem\" file?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":243,"Q_Id":58892964,"Users Score":0,"Answer":"The correct environment variable is REQUESTS_CA_BUNDLE - note the plural.","Q_Score":2,"Tags":"python,azure,ssl,azure-machine-learning-service,certifi","A_Id":58896952,"CreationDate":"2019-11-16T16:45:00.000","Title":"azureml-sdk ignores the REQUESTS_CA_BUNDLE environment variable","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am currently working on a Django project and want to install an additional Django (app) package called \"tinymce\". I've installed Anaconda just recently and I'm not used to commands related to conda. I often used to pip install packages from the command prompt. But now I'm really confused if I really should just use the same pip install or use some other conda commands (if there are any) to install that package. Also, does that affect anything, if I am to frequently use that packages? \nFYI: I'm on Windows & using Python 3.7 using the recent Anaconda release.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1834,"Q_Id":58914993,"Users Score":4,"Answer":"Before you start installing packages, you should decide on how you want to manage your packages for different projects. I'd recommend that you create a dedicated conda environment for each project. Then you have to activate the respective environment whenever you want to work on a project. But packages installed for one project don't interfere with those for another. It helps to install Miniconda rather than Anaconda, because that keeps the conda base environment clean.\nYou write that you're used to calling pip install, but you don't mention Python virtual envs nor conda environments. That sounds as if you're typically installing packages globally on your machine. Sooner or later, that's going to create a mess.\nIf you decide to use conda environments, you have to remember to always activate the environment for your project before installing packages for that project. Then both pip install and conda install will put packages into that environment. When I have a choice, I prefer to install packages with conda from its default channels. conda has better dependency management than pip, and conda can handle non-Python dependencies. But packages sometimes have different names in conda and pip, so it might be extra effort to translate installation instructions for pip into similar commands for conda.","Q_Score":3,"Tags":"python,python-3.x,pip,anaconda,conda","A_Id":58964120,"CreationDate":"2019-11-18T12:52:00.000","Title":"Does a package also gets installed in conda environment if I use pip to install packages not included in Anaconda?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying extract data from PDF. The data to be extracted in a structured way. For example document id and its corresponding value. we have to extract a set of key-value pairs as a json format and stored in db. Is there a way to accomplish this task?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":255,"Q_Id":58926555,"Users Score":2,"Answer":"If you are using UIPath you need to install 2 packages:\n1.Uipath PDF Activities - to read the pdf\n2.UiPath Web Activities - here you can find DeserializeJSON activity (or DeserializeJSON array )\n***Personally I would extract the data and save it in xlsx file","Q_Score":0,"Tags":"python,r,json,pdf,uipath","A_Id":58929327,"CreationDate":"2019-11-19T04:14:00.000","Title":"Is there a way to scrape data from a PDF into a structured JSON format?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"for an academic project, I am currently using the python framework jam.py 5.4.83 to develop a back office for a new company. \nI would like to use views instead of tables for reporting but I don't find how to do it, I can only import data from tables.\nSo if someone already used this framework, I would be very thankful.\nRegards,\nYoan","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":236,"Q_Id":58933918,"Users Score":0,"Answer":"the use of database views are not supported in Jam.py\nHowever, you can import tables as read only if used for reporting.\nThan you can build Reports as you would.\nGood luck.","Q_Score":0,"Tags":"python,view,frameworks","A_Id":60222402,"CreationDate":"2019-11-19T12:15:00.000","Title":"Use of views in jam.py framework","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working on a full stack web application for a class, and originally was going to use AWS S3 for hosting, Dynamo as a database, Lambda for passing data to and from Dynamo, and Gateway API to connect the front and back end, but have had nothing but issues with AWS. As this is just a class project, nothing needs to be remotely hosted, and a classmate suggested Django to allow us to completely ditch AWS. After looking through a lot of the introductory stuff for Django, it looks like it could be the magic bullet we need. However, we already have dozens of hours sunk into our frontend HTML\/CSS\/Javascript, as well as some Bootstrap. My only reservation about making a complete dive for Django for handling our database and enabling us to run everything off localhost is that it seems to do EVERYTHING in Python, and I don't immediately see any way to integrate our existing frontend. Our frontend JS is intended to receive data from the database and do rudimentary calculations with it before providing it to the HTML page, and I'm also not sure how this would integrate with Django and SQLite.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":405,"Q_Id":58944143,"Users Score":0,"Answer":"HTML: Most of it will be reused, but you will do some work of splitting it into templates and blocks if you plan to generate it on the server side, which is normal for Django.\nCSS: can be reused without change if you're careful with your HTML templates.\nJavascript: it very much depends on the way you structure your application. Likely much of it will require rework where it interacts with server side (like calling APIs), but most would work as-is where it only interacts with the client (like form validation, etc).\n\nPlease note that the architecture you're describing and a typical Django architecture differ quite much; do your research and write a toy project first. There is a number of good intros. \nYou will have to re-architect and rewrite all of your backend code. There seems to be Dynamo support if you stay with AWS, but everything around lambdas will likely go away, and you will deploy to normal AWS EC2 instances, or any other hosting provider if you want.\nRemember: do the simplest thing that could possibly work. If in doubt, YAGNI.","Q_Score":0,"Tags":"javascript,python,html,django","A_Id":58944220,"CreationDate":"2019-11-19T22:58:00.000","Title":"Is it possible to use my existing HTML\/CSS\/JS with a move to Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm worried about the security of my web app, I'm using Django and sometimes I use AJAX to call a Django url that will execute code and then return an HttpResponse with a message according the result, the user never notice this as it's happening in background.\nHowever, if the url I'm calling with AJAX is, for example, \"runcode\/\", and the user somehow track this and try to send a request to my domain with that url (something like \"www.example.com\/runcode\/\"), it will not run the code as Django expects the csrf token to be send too, so here goes the question.\nIt is possible that the user can obtain the csrf token and send the POST?, I feel the answer for that will be \"yes\", so anyone can help me with a hint on how to deny these calls if they are made without the intended objective?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":95,"Q_Id":58961605,"Users Score":0,"Answer":"Not only django but this behavior is common in all others,\nYou can only apply 2 solution,\n\nApply CORS and just allow your domain, to block other domain to access data from your API response, but this will not effective if a user direct call your API end-point.\nAs lain said in comment, If data is sensitive or user's personal, add authentication in API. \n\nThanks","Q_Score":0,"Tags":"javascript,python,django,ajax,security","A_Id":58970830,"CreationDate":"2019-11-20T19:03:00.000","Title":"Prevent internal POST methods to be called by third parties","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My unit test are failing with the following error\ndjango.db.utils.OperationalError: Problem installing fixture '\/Users\/vivekmunjal\/chargepoint\/code\/Installer\/api\/installer\/fixtures\/country.json': Could not load installer.Country(pk=1): (1054, \"Unknown column 'display_order' in 'field list'\")\nBasically one of my migrations is loading data in country model from a fixture, but the model has added some extra fields in them, so when the migrations runs it try to insert a column which is not yet created and fails. Can anyone suggest any remedy for the same?","AnswerCount":1,"Available Count":1,"Score":0.537049567,"is_accepted":false,"ViewCount":142,"Q_Id":58973892,"Users Score":3,"Answer":"Your database and code are inconsistent at the moment of your migration loading. You should split these migrations because now it happens during one transaction and your changes aren't committed when you trying load the fixture.\nIn general, it's bad practice to load fixtures during migrations.\nI advise you to implement the script which you will run after all migrations passed.","Q_Score":0,"Tags":"django,python-3.x,migration","A_Id":58974411,"CreationDate":"2019-11-21T11:26:00.000","Title":"Unit test failing due to migration error caused by loaddata in django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm creating my own Docker container for use with SageMaker and I'm wondering why the serve command creates a Flask app to serve predictions on data when I want to do a batch transform job. Wouldn't it be simpler to just unpickle the model and run the model's predict method on the dataset I want predictions for? I don't need a web api\/endpoint. I just need to automatically generate predictions once a day.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":445,"Q_Id":58985124,"Users Score":1,"Answer":"Good question :) using the exact same code for batch inference and online inference reduces development overhead - the exact same stack can be used for both use-cases - and also reduces risks of having different results between something done in Batch and something done online. That being said, SageMaker is very flexible and what you describe can easily be done using the Training API. There is nothing in the Training API forcing you to use it for ML training, it is actually a very versatile docker orchestrator with advanced logging, metadata persistance, and built for fast and distributed data ingestion.","Q_Score":3,"Tags":"python,amazon-web-services,docker,machine-learning,amazon-sagemaker","A_Id":59002763,"CreationDate":"2019-11-21T23:11:00.000","Title":"Why does AWS SageMaker run a web server for batch transform?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am new to web development. I am not familiar with Django. I have written some Python scripts which do some intense calculations and graphs plotting using Python packages such as numpy, matlibplot and so on. I want to publish it as a web application on a server to be accessed by other computers.\nSo I am wondering, do I need to copy all the required packages into the project directory before deploying the application to a server? Or Django will automatically handle the Python packages dependencies upon deploying?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":30,"Q_Id":58990871,"Users Score":0,"Answer":"You have to create virtual environment.\nA virtual environment is a tool that helps to keep dependencies required by different projects separate by creating isolated python virtual environments for them.","Q_Score":0,"Tags":"python,django","A_Id":58991021,"CreationDate":"2019-11-22T09:09:00.000","Title":"Django Apps and Python Packages Dependencies","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to web development. I am not familiar with Django. I have written some Python scripts which do some intense calculations and graphs plotting using Python packages such as numpy, matlibplot and so on. I want to publish it as a web application on a server to be accessed by other computers.\nSo I am wondering, do I need to copy all the required packages into the project directory before deploying the application to a server? Or Django will automatically handle the Python packages dependencies upon deploying?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":30,"Q_Id":58990871,"Users Score":0,"Answer":"All the needed packages need to be installed on the server where is the web application running. If you have all the packages installed on your personal computer before deploy you will need to install the on the server as well.","Q_Score":0,"Tags":"python,django","A_Id":58990967,"CreationDate":"2019-11-22T09:09:00.000","Title":"Django Apps and Python Packages Dependencies","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"This error is easy to reproduce. Basically just start a new django project and run the server with django-admin. I read many StackOverflow posts and tried multiple methods but did not work. Here are the detailed steps to reproduce:\n\nCreated new directory named testproject\npipenv install django\nStarted new project named test with the django start project script\npipenv shell\ndjango-admin runserver\nError: \"django.core.exceptions.ImproperlyConfigured: Requested setting DEBUG, but settings are not configured. You must either define the environment variable DJANGO_SETTINGS_MODULE or call settings.configure() before accessing settings.\"\nTyped this in ubuntu as suggested in the official django docs:  export DJANGO_SETTINGS_MODULE=test.settings \ndjango-admin runserver\nGot a giant line of error followed by ModuleNotFoundError: No module named 'test'. However, if i do django-admin runserver --pythonpath=. --settings=\"test.settings\" the server successfully runs.\n\nI know I can just use python manage.py to start the server but my project uses Django cache framework and when I try to access the cache the same settings are not configured error is thrown. Trying to understand what is going on, any help would be greatly appreciated.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":614,"Q_Id":59015034,"Users Score":0,"Answer":"In your list I did not see the virtual env activation.\nDid you activate the virtual env ?\n'''\nsource activate testproject\n'''","Q_Score":0,"Tags":"python,django","A_Id":59022792,"CreationDate":"2019-11-24T05:54:00.000","Title":"Django \"settings are not configured\" error and cannot define environment variable DJANGO_SETTINGS_MODULE","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have my web application. Now i want to integrate salesforce into my web app so that i can push data from my app to any salesforce org after the authentication(OAuth).\nI found 2 ways:\n1. Connected Apps\n2. via wsdl generation file and use\nI created a connected app from my developer account and i authenticated using consumer key, cusumer secret key(from my connected app) and username of user and secret token of the user account.\nI tried with another free trail account, It's validating and fetching the details and post data also working.\nMy question is, shall i deploy my connected app into app exchange, then only i caan use REST APIs ?\n\ngenerating wsdl and coding around is the better option than the above ?\n\nIs there a option, only one time authentication enough for any number of sessions and use the REST APIs?\nPlease suggest me a best way to proceed.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":43,"Q_Id":59031743,"Users Score":1,"Answer":"You're mixing up a couple of independent issues here.\n\nIf you're going to authenticate via OAuth, you must have a Connected App. \nA SOAP API login() call requires you to store a username and password, which is undesirable.\nThere is no way to \"permanently\" authenticate, i.e., to get a session id that never expires. Your app must always be ready to get a new access token via the OAuth refresh token it obtains and stores (via, for example, the Web Server OAuth flow), or to reauthenticate via JWT flow.\nConnected Apps are global metadata in most cases. You don't need to deploy a Connected App into a target org in order to authenticate using its Client Id and Secret into that org. The only exception I'm aware of is if you want to use the JWT flow with a certificate and preauthorized Profiles and Permission Sets.\nBased on what you've shared, I don't see any reason for the AppExchange to be involved.","Q_Score":0,"Tags":"python-2.7,salesforce","A_Id":59143337,"CreationDate":"2019-11-25T12:21:00.000","Title":"want to push\/pull data into\/from SalesForce Accounts\/leads from\/to my external web app","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have installed django and then tried using the command line to make a virtual environment then oops it gives me this error\n\"'\"virtualenv\"' is not recognized as an internal or external command,\noperable program or batch file.\"\nwhat should I do to correct this","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":63,"Q_Id":59036932,"Users Score":1,"Answer":"If you are on python3 , use python3 -m venv <env-name> , env-name being your preferred name for your virtual env. \nAlso you get that error because virtualenv is not installed on your system. You can install with pip install virtualenv","Q_Score":0,"Tags":"python,django","A_Id":59036974,"CreationDate":"2019-11-25T17:13:00.000","Title":"I am trying to create a webapp using django framework","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"when I enter this line pip3 install mysqlclient it gives me this error :\n\nERROR: Command errored out with exit status 1:\n\nthis happened after I tried using pip install mysqlclient","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":28,"Q_Id":59039604,"Users Score":0,"Answer":"In order to use pip or pip3 in Windows operating system ; \n\nPYTHONPATH system variable should be added to environment variables for the path of\npython.exe file such as\nC:\\Users\\pc\\AppData\\Local\\Programs\\Python\\Python36\\\nPATH system variable should be edited by adding new paths such as\nC:\\Users\\pc\\AppData\\Local\\Programs\\Python\\Python36\\ and \nC:\\Users\\pc\\AppData\\Local\\Programs\\Python\\Python36\\Scripts\\\n\nThen, both of the variables might be checked whether they're set from command line by \nC:\\Users\\pc>echo %PYTHONPATH% and C:\\Users\\pc>echo %PATH%","Q_Score":0,"Tags":"python,mysql,pip","A_Id":59040353,"CreationDate":"2019-11-25T20:27:00.000","Title":"Error when trying to download mysql in a trial django project","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Django app running on Elastic Beanstalk in a Multicontainer Docker platform. So each EC2 instance has Docker containers for Django, Celery, RabbitMQ and Nginx.\nI have concerns regarding celery tasks when an EC2 instance is removed due to an auto-scale event or an immutable deployment.\n\nWill current tasks in the celery queue be lost when an instance is\nremoved?\nCan a running celery task be interrupted on an instance removal?\nCelery beat schedule (cron) would be called from every new instance\nlaunched, causing duplicated calls.\n\nI'm curious if anyone else has experience solving the above? Here's a list of some of the solutions I'm thinking about:\n\nChange the celery broker to a remote ElastiCache Redis instance. Not\nsure that would work tho.\nUse another library to replace Celery which can store the tasks in\nthe DB (e.g. huey or apscheduler).\nMigrate from celery to AWS SQS + Elastic Beanstalk Worker. That\nwould mean duplicating the same codebase to be deployed to both the\ncurrent web as well as a worker Elastic Beanstalk.\n\nAny other ideas or concerns?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":731,"Q_Id":59065099,"Users Score":0,"Answer":"Do you need separate Celery\/Rabbit instance for every EC2 instance? Removing the rabbit instance will kill the celery unless you store it externally","Q_Score":1,"Tags":"python,django,amazon-web-services,celery,amazon-elastic-beanstalk","A_Id":59073048,"CreationDate":"2019-11-27T07:28:00.000","Title":"Are celery tasks and queues interrupted when elastic beanstalk EC2 instances are removed?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Can someone brief me on what happens if I didn't use any webserver(NGINX) in front of my Application server (uWSGI or GUNICORN)?\nMy requirement is exposing a simple python script as a web-service. I don't have any static content to render. In that scenario can I go without NGINX?\nBrief me what are the issues I will face if I go with plain app server? Max requests per second would be some 50 to 80(This is the upper limit).\nThanks, Vijay","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":66,"Q_Id":59085500,"Users Score":0,"Answer":"If your script acts like a webserver then it is a webserver and you don't need any layer on top of it.\nYou have to make sure though it acts like one:\n\nlistens for connections\nhandles them concurrently\nwakes up upon server restart, etc\u2026\n\nAlso:\n\nhandles internal connections correctly (eg. to the database)\ndoesn't leak memory\ndoesn't die upon an exception\n\nHaving a http server in front of a script has one great benefit: the script executes and simply dies. No problem with memory handling and so on\u2026 imagine your script becomes unresponsive, ask yourself what then\u2026","Q_Score":0,"Tags":"python-3.x,nginx,uwsgi","A_Id":59085973,"CreationDate":"2019-11-28T09:28:00.000","Title":"What happens if i didn't use NGINX with uWSGI or Gunicorn?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am getting the following error while trying to install Django for python3\n\n(base) C:\\ShashiPractice ProjectStudent>pip install django\n  Collecting django\n   Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None))\n  (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] \n  ...\n  ...\n  ...\n  y failed: self signed certificate in certificate chain (_ssl.c:1056)')))","AnswerCount":1,"Available Count":1,"Score":-0.1973753202,"is_accepted":false,"ViewCount":132,"Q_Id":59086002,"Users Score":-1,"Answer":"You made a small mistake.\nThe pip command is as follows:\npip install Django\nNote that the the D in Django is in block letter. Hope this solves your problem :)","Q_Score":0,"Tags":"django,python-3.x,pip","A_Id":59087917,"CreationDate":"2019-11-28T09:52:00.000","Title":"I got error while installing Django on pycharm","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In a typical python server setup it is recommended to have Nginx web server serve the static content and proxy the dynamic requests to  Gunicorn app server. \nNow if I am not serving any static content through my python application do I still need Nginx in front of Gunicorn ? What would be the advantages ? \nDetailed explanation would be really appreciated.\nAll the static content is served through CDN and the backend server will only need to serve the APIs(REST). So when I will only server dynamic content, will I need to have Nginx ? Does it have any advantage in case of high load etc.","AnswerCount":3,"Available Count":1,"Score":0.1325487884,"is_accepted":false,"ViewCount":4178,"Q_Id":59089648,"Users Score":2,"Answer":"No, I no longer deploy nginx specifically for the python app. I may have an application load balancer \/ nginx in the path to split requests to other apps, but not for load management. If using asyncio based systems, I typically don't even use an app server (uwsgi\/gunicorn). This is including apps with very high throughput. Every layer of reverse-proxy \/ layer-7 load balancing will add a touch of latency- don't add it if you don't need it.","Q_Score":15,"Tags":"python,django,nginx,django-rest-framework,gunicorn","A_Id":60285690,"CreationDate":"2019-11-28T13:08:00.000","Title":"Do I need Nginx with Gunicorn if I am not serving any static content?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an already existing Django app. I would like to add a system that sends data from my Django application to another Python application hosted on another server, so that the Python application receives data from the Django App in json format, possibly. \nSo for example, i would need to create a view that every tot seconds sends the data from a DB table to this application, or when a form is hit, the data is sent to this external application.\nHow can i do this? Is there an example for this particular matter? I don't know what tools i'd need to use to create this system, i only know that i would need to use Celery to perform asynchronous tasks, but nothing else; should i use Webhooks maybe? Or Django channels?\nEdit: adding some more context:\nI have my Django client. Then i have one or two Python applications running on another server. On my Django client i have some forms. Once the form is submitted, the data is saved on the db, but i also want this data to be sent instantly to my Python applications. The Python applications should receive the data from Django in Json format and perform some tasks according to the values submitted by users. Then the application should send a response to Django.","AnswerCount":3,"Available Count":1,"Score":0.1325487884,"is_accepted":false,"ViewCount":1295,"Q_Id":59117241,"Users Score":2,"Answer":"Yeah, webhook would be one of the options, but there are other options available too.\n-> You can use Rest Apis to send data from one app to another. but In their case, you need to think about synchronization. That depends on your requirement, If you don't want data in synchronize manner then you may use RabbiMq or other async tools. Just push your rest API request in Rabbitmq and Rabbitmq will handle.","Q_Score":2,"Tags":"python,django","A_Id":59117541,"CreationDate":"2019-11-30T14:50:00.000","Title":"Send data from Django to another server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I installed python and google cloud sdk. I'm trying to use:\ndev_appserver.py app.yaml\nWhen I go to my directory with my web app (using cd [directory]) and enter dev_appserver.py app.yaml into the command line nothing happens. The prompt shows the next line in CMD like I didn't enter anything... I indeed have an app.yaml file and this works perfectly on my MacBook running a local server.\nI also tried just typing \"dev_appserver.py\" and hitting enter and again nothing happens... It's as if I were to press enter in the command line without typing anything.\nOn MacBook when I type dev_appsever.py without pointing to an app.yaml file - it at least shows me all the potential commands associated with dev_appserver.py. Why doesn't the windows command prompt seem to understand this command? Nor tell me it doesn't understand it? Please help!!! I really want to run a local server for cloud engine on my Windows machine, but have no idea what's wrong. I google'd a bunch and haven't found someone else with this issue...","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":234,"Q_Id":59121625,"Users Score":1,"Answer":"Finally solved my issue.... turns out goodle cloud sdk requires python 2.7. I uninstalled python 3.8, installed python 2.7. dev_appserver then didn't run unless I went into the folder where it exists: \nuser\/name\/local\/google\/cloudsdk\/bin\nAnd then I run python dev_appserver.py and it works.\nI also had to make sure my python command worked by adding it into my path. Python3.8 makes it easy to do via install wizard, but 2.7 requires you to go into your environment vars yourself to add it. This is why my python command originally did nothing.\nNot related - but my Blender 2.81 stopped working after this. I found out blender requires Python3. So I installed Python3.8 again and got both cloud sdk and blender working. Took way too many hours to solve this.... damn...","Q_Score":0,"Tags":"python","A_Id":59128906,"CreationDate":"2019-12-01T00:47:00.000","Title":"dev_appserver.py does nothing in CMD on windows","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm really new to Python and I'm trying to do a tutorial on using flask. When I run the below code:\nfrom flask import Flask\napp = Flask(__name__)\n@app.route(\"\/\")\ndef home():\n    return \"Hello, World!\"\nI get the following error message:\nTraceback (most recent call last):\n  File \"\/Users\/myname\/Documents\/PycharmProjects\/flask\/test_webapp.py\", line 1, in <module>\n    from flask import Flask\nModuleNotFoundError: No module named 'flask\nThis doesn't make any sense to me as when I run:\npython -m pip list\nFlask 1.1.1 is on the list. \nI am using Python version 3.7.4.\nI realise this questions has been asked before but after carefully reading through I can't find the correct answer. I realise this is quite basic but any help would be really appreciated!","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":232,"Q_Id":59125683,"Users Score":0,"Answer":"python -m pip list answers in terms of Python 2.x\nIf you're using Python 3.x, you need to do pip3 install flask","Q_Score":0,"Tags":"python,flask","A_Id":59132946,"CreationDate":"2019-12-01T12:53:00.000","Title":"Python error loading flask: ModuleNotFoundError: No module named 'flask'","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm really new to Python and I'm trying to do a tutorial on using flask. When I run the below code:\nfrom flask import Flask\napp = Flask(__name__)\n@app.route(\"\/\")\ndef home():\n    return \"Hello, World!\"\nI get the following error message:\nTraceback (most recent call last):\n  File \"\/Users\/myname\/Documents\/PycharmProjects\/flask\/test_webapp.py\", line 1, in <module>\n    from flask import Flask\nModuleNotFoundError: No module named 'flask\nThis doesn't make any sense to me as when I run:\npython -m pip list\nFlask 1.1.1 is on the list. \nI am using Python version 3.7.4.\nI realise this questions has been asked before but after carefully reading through I can't find the correct answer. I realise this is quite basic but any help would be really appreciated!","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":232,"Q_Id":59125683,"Users Score":0,"Answer":"Module Flask is installed for Python 2 (Python), but not for Python 3 (Python3) that you are using.\nSo, install it as pip3 install Flask","Q_Score":0,"Tags":"python,flask","A_Id":59139113,"CreationDate":"2019-12-01T12:53:00.000","Title":"Python error loading flask: ModuleNotFoundError: No module named 'flask'","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I remember when I save my files in PHP language, it didn't need to restart or reload apache web server.\nIn Python, specialy Django, If I use django webserver with runserver command,it needs to restart django if I change my files. Question is, if I use WSGI in server, Does it behave such as php or runserver command?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":40,"Q_Id":59139472,"Users Score":1,"Answer":"If you modify static files or html template, you should be fine without reloading your server.\n But you will need to reload your apache server if you change any of your python files.","Q_Score":0,"Tags":"php,python,django,mod-wsgi","A_Id":59164319,"CreationDate":"2019-12-02T13:01:00.000","Title":"Does WSGI behave dynamicly?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've defined a Django model which makes use of FilePathField(allow_files=False, allow_folders=True) which shall allow to define a required (not optional) file system directory in the model. If I try to add a new model in the admin interface I get a file not found error. All my other models registered the same way are just working fine. If I'd use CharField() instead of FilePathField() to hold the file system directory path I'd simply define a default value like CharField(default='').\nHow can I fix the model making use of the FilePathField field?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":378,"Q_Id":59158671,"Users Score":2,"Answer":"I have encountered same problem and the cause of the error is that django tries to scan the directory in order to get list of files that will be displayed as choices in html widget.\nThere are few solutions.\n\nIf you don't mind limiting what paths can be added by users just add path=\/some\/dir to FilePathField\nIf you don't want to limit paths but don't care about ability to update path trough admin just set editable=False in FilePathField\nIf you want both  you can replace widget in admin for this particular field to classic text input.","Q_Score":1,"Tags":"django,python-3.x,django-models","A_Id":66444575,"CreationDate":"2019-12-03T13:53:00.000","Title":"Django FilePathField raises file not found error","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Currently I am working in big firm where we need to convert python2 old big Django project into python3 version so I have done lots of research related but still not able to find any perfect answer related to which version of Python and Django best suited for conversion.\nCurrently I am using Python : 2.7.16 & Django : 1.9.13 in my old version.\nAnyone can suggest me best suited version of Python & Django for above old version for python2 to python3 conversion.","AnswerCount":5,"Available Count":2,"Score":0.0798297691,"is_accepted":false,"ViewCount":1922,"Q_Id":59188902,"Users Score":2,"Answer":"I have same kind of issue with my project and I have tried python 3.7.5 with Django version 2.2.7.\nYou should not go with python latest version 3.8 or Django latest version 3.0 because you there may have been chances that for any kind of bug you may not able to get proper solution for latest versions.","Q_Score":11,"Tags":"python,django,python-3.x,python-2to3","A_Id":59583539,"CreationDate":"2019-12-05T05:38:00.000","Title":"For Python2 to Python3 code conversion, Which version of Python & Django best suited?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Currently I am working in big firm where we need to convert python2 old big Django project into python3 version so I have done lots of research related but still not able to find any perfect answer related to which version of Python and Django best suited for conversion.\nCurrently I am using Python : 2.7.16 & Django : 1.9.13 in my old version.\nAnyone can suggest me best suited version of Python & Django for above old version for python2 to python3 conversion.","AnswerCount":5,"Available Count":2,"Score":-0.0798297691,"is_accepted":false,"ViewCount":1922,"Q_Id":59188902,"Users Score":-2,"Answer":"You should try to shoot for the current versions. Python 3.8 and Django 3.0.The Six library will help with some convention changes. Either way you are going to have to do some refactoring so you might as well make it current.","Q_Score":11,"Tags":"python,django,python-3.x,python-2to3","A_Id":59189020,"CreationDate":"2019-12-05T05:38:00.000","Title":"For Python2 to Python3 code conversion, Which version of Python & Django best suited?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am having some struggles how does exactly django.admin.LogEntry objects are created.\nConsider the following scenario:\nI have a bunch of functions which take a csv file with data that allow me to create multiple objects at one call (just iterate through the file, use the data and if data in given row is correct: create a Model instance). I want to make sure that that each of that creation will be logged.\nThe question is: django docs are not very descriptive on how does LogEntry works and I am not sure if such actions (not taken in the admin panel itself) will be logged there. Also: will the LogEntries be created for the related objects or I have to trigger them manually?\nDoes anybody got any experience with such scenarios and can share thoughts about it?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1032,"Q_Id":59191936,"Users Score":1,"Answer":"The LogEntry model is in the Admin package and only used by Django admin by default. It is used in the admin layer and not model layer when saving objects. if you want to use it outside the admin, then you will have to manually create the entries yourself. That also means the admin will likely display entries of changes made by normal users so you have to think about how you want the entries displayed","Q_Score":0,"Tags":"django,python-2.7,django-models,django-admin,django-1.11","A_Id":59192031,"CreationDate":"2019-12-05T09:28:00.000","Title":"Django Admin LogEntry: how it works in non admin actions?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Models and Bounded-Context conceptually are:\nModel:\n\nA system of abstractions that describes selected aspects of a domain\n  and can be used to solve problems related to that domain.\n\nBounded-Context: \n\nThe setting in which a word or statement appears that determines its\n  meaning.\n\nBut I have to questions:\n\nIs the relationship between the two is containment relationship,\ni.e. Bounded-Context has one or more models?\nAs I understand DDD concepts should be identifiable (to some degree) through the codebase, this is clear for Aggregate, Entities, Event, Commands...etc, but how Models and Bounded-Context are mapped into the codebase? for example is a models just a set of one or more aggregates, or something else? is Bounded-context a namespace or something else?\n\nThanks in advance.\nNote: Feel free to state your answer in term of some framework, Django, Axon..etc.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":364,"Q_Id":59196817,"Users Score":0,"Answer":"This is based on my understanding of course... opinions may vary.\n\n\nModel is not one thing in your code but if done well, it is the code. It is what you come up with from the knowledge crunch of the business and try and capture in code. Coming up with one model for the whole business is usually a fool errand. So you have a context that the model is valid in...\nA bounded context is a context that a model is valid. This is valuable for a few reasons. It allows us to manage the scope and complexity of a model. A model is only useful insomuch as it helps us solve business problems. To do this we need to be able to keep some form of it in our heads so we can understand. This is where language comes in. The language, aggregates, etc. are valid for that context. I like to use an example here. A product in an eCommerce checkout is different from a product being picked from a warehouse. They may share some concepts but some are not relevant across contexts. How they relate should be captured in a context map.","Q_Score":0,"Tags":"python,domain-driven-design,implementation","A_Id":59203523,"CreationDate":"2019-12-05T13:59:00.000","Title":"How Models and Bounded-Contexts are mapped into the codebase DDD?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Models and Bounded-Context conceptually are:\nModel:\n\nA system of abstractions that describes selected aspects of a domain\n  and can be used to solve problems related to that domain.\n\nBounded-Context: \n\nThe setting in which a word or statement appears that determines its\n  meaning.\n\nBut I have to questions:\n\nIs the relationship between the two is containment relationship,\ni.e. Bounded-Context has one or more models?\nAs I understand DDD concepts should be identifiable (to some degree) through the codebase, this is clear for Aggregate, Entities, Event, Commands...etc, but how Models and Bounded-Context are mapped into the codebase? for example is a models just a set of one or more aggregates, or something else? is Bounded-context a namespace or something else?\n\nThanks in advance.\nNote: Feel free to state your answer in term of some framework, Django, Axon..etc.","AnswerCount":2,"Available Count":2,"Score":0.1973753202,"is_accepted":false,"ViewCount":364,"Q_Id":59196817,"Users Score":2,"Answer":"Is the relationship between the two is containment relationship, i.e.\n  Bounded-Context has one or more models?\n\nI guess you could say it that way, but a bounded context (BC) has just one model, with objects named according to the ubiquitous language (UL) of the BC.\nBoth models and BCs belong to the solution space.\nIn the problem space you have the domain and sub-domains.\nIn the solution space you have BCs (ideally 1:1 related with sub-domains). You model a subdomain, and you have a BC for each sub-domain model.\nBut for example you could model the entire domain with just one model, so that you would have just a BC in the solution space for the entire domain. In this case you have one BC related to many subdomains. This BC would be a monolithic application.\nThe other example, one sub-domain related to many BCs, happens when you split the sub-domain into several \"parts\", and you model each \"part\". So you would have many models for the subdomain. This way in the solution space you have many BCs for the subdomain, i.e., many applications to solve a subdomain problem.\nThese cases of 1:N or N:1 relationships between subdomains and BCs happens when the division according to the UL terminology is fuzzy.\n\nAs I understand DDD concepts should be identifiable (to some degree)\n  through the codebase, this is clear for Aggregate, Entities, Event,\n  Commands...etc, but how Models and Bounded-Context are mapped into the\n  codebase? for example is a models just a set of one or more\n  aggregates, or something else? is Bounded-context a namespace or\n  something else?\n\nA BC is a software system, an autonomous application. And a model is the source code of the BC. But in DDD there exists another concept: the module, a cohesive group of domain objects. It is a thinner division than BCs.\nSo you have, from wider to smaller:\nSolution --> BC --> module --> aggregate --> entity & value objects","Q_Score":0,"Tags":"python,domain-driven-design,implementation","A_Id":59282666,"CreationDate":"2019-12-05T13:59:00.000","Title":"How Models and Bounded-Contexts are mapped into the codebase DDD?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a question so in telegram bot there is a InlineKeyboardMarkup that can have a callback, but its not persistent, does not stick to the botton of the screen, when you write a new message it will go up, like a normal message. And on the other hand there is ReplyKeyboardMarkup that does persist and stay at the botton, but does not have a callback. So is there a way to create a button that stays at the botton but allso accepts a callback that you can catch with callback_query_handler","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":329,"Q_Id":59201308,"Users Score":0,"Answer":"No, there is no way to create a button that you can capture with callback_query_handler in a ReplyKeyboardMarkup.\nWhen you press a KeyboardButton, it sends a message with its text. What you could do is put your bot's commands in the buttons or you can make a message handler that captures non-command messages and execute some code for each text of your buttons.","Q_Score":0,"Tags":"python,telegram","A_Id":59201831,"CreationDate":"2019-12-05T18:32:00.000","Title":"Fixed button for Telegram bot that accepts a callback","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm having an hard time figuring out how to solve a problem with a little project.\nBasically i have a Django application. On the other hand i have an external Python script running. I would like to create a system where, each time a form in my Django app is submitted, the data submitted in the form is sent to the external Python application.\nThe external Python service should receive the data, read it, and according to who is the user and what did he submit, it should perform some tasks, then send a response.\nHere is what i thought: 1) Connect the external Python app to the same database that Django is using. So that when the form is submitted, it is saved on the database and the data can be 'shared' with the second Python service. The problem with this solution is that i would need the second app to query the Database every second and perform a lot of queries, that would be a problem with performances. 2) Create an epi endpoint, so that the external python app would connect to the endpoint and fetch the data saved in the database from there. The problem is the same of the first solution. Would a service like Redis or RabbitMQ help in this case?\nImporting the external Python process in my Django app is not a solution, it needs to be separate from the Django app. An important requirement for this, is speed. When new data is submitted, it needs to be received by the second Python app in the shortest time possible.\nThat said, i'm open to any advice or possible solution to solve this problem, thanks in advance :)","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":862,"Q_Id":59202971,"Users Score":1,"Answer":"You should build an API. The 2nd app would now be an application server and the 1st app, when it receives a form submission from the user, would persist its data to the DB and then make an API call to the 2nd app via this API. You would include key information in the API request that identifies the record in the DB.\nYou can use Django (e.g. DRF) or Flask to implement a simple API server in Python.\nNow, this requires your app server to be up and running all the time. What if it's down? What should the 1st app do? If you need this level of flexibility, then you need to decouple these apps in some way. Either the 1st app implements some kind of backoff\/retry if it can't send to the 2nd app. Or you use a reliable queueing mechanism (something like Amazon SQS).","Q_Score":2,"Tags":"python,django","A_Id":59203064,"CreationDate":"2019-12-05T20:42:00.000","Title":"How can two Python applications hosted in different servers communicate?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have tried this code but always return an empty query, and i don't know why.\nparent = MangaPage.objects.filter(title=Page.get_parent)","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":410,"Q_Id":59204717,"Users Score":2,"Answer":"get_parent is a method on a specific instance of the Page class, it's not a property. You should not call it from the Page class directly, but rather from a specific page.\nIt should look something like this:\nparent = MangaPage.objects.get(title='Some Title').specific().get_parent()\nEssentially what you are doing in your code example is searching for a MangaPage that has a title equal to the method Page.get_parent, which of course there are none. You need to get the parent of a specific page instance.","Q_Score":0,"Tags":"python,django,wagtail","A_Id":59204857,"CreationDate":"2019-12-05T23:28:00.000","Title":"I can't get parent page query in wagtail","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"i run a python program using beautifulsoup and requests to scrape embedded videos URL , but to download theses videos i need to bypass a  ads popups and javascript reload only then the m3u8 files start to appear in the network traffic;\nso i need to simulate the clicks to get to the javascript reload (if there's a method better than selenium, trying to reduce script dependencies) and then when the m3u8files appear i need to get their url.","AnswerCount":2,"Available Count":1,"Score":-0.0996679946,"is_accepted":false,"ViewCount":1293,"Q_Id":59227170,"Users Score":-1,"Answer":"Blockquote\n  `i run a python program using beautifulsoup and requests to scrape embedded videos URL , but to download theses videos i need to bypass a ads popups and javascript reload only then the m3u8 files start to appear in the network traffic;\n\nso i need to simulate the clicks to get to the javascript reload (if there's a method better than selenium, trying to reduce script dependencies) and then when the m3u8files appear i need to get their url\n`Can I have your code please?","Q_Score":0,"Tags":"javascript,python-3.x,beautifulsoup,python-requests,m3u8","A_Id":59507440,"CreationDate":"2019-12-07T14:47:00.000","Title":"How to scrape m3u8 from Network-Stream after a js reload (Python)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Thank you all for always willing to help.\nI have a Django app with countries and state choices fields. However, I have no idea whatsoever on how to load the related states for each country. What I mean here is, if I choose \"Nigeria\" in the list of countries, how can I make all Nigerian states to automatically load in the state choice field?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":52,"Q_Id":59228446,"Users Score":0,"Answer":"You have to create many to many field state table, then you can multiple select state as per country.\nthis feature available on django- country package or django- cities package.","Q_Score":0,"Tags":"django,python-3.x,django-models","A_Id":59228702,"CreationDate":"2019-12-07T17:17:00.000","Title":"How to load values related to selected multiple options in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a webapp that I made using django that I need to deploy to many raspberry pi devices. I'm using ansible to automate the deployment to devices. While developing the app I used pipenv to manage my project dependencies in a virtual environment.\nMy question is, is it necessary to make a virtual environment on the actual raspberry pi devices when deploying or can I just install all my necessary packages on the system environment? What are the advantages of making a virtual environment on the device?\nThank you.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":78,"Q_Id":59239496,"Users Score":1,"Answer":"Separating your apps' dependencies from systems' is always a good idea. The overhead is minimal and may prevent issues in the future. It makes it much easier to tear down and rebuild your app if you ever need to, rather than potentially having to re-image the raspberry pi if anything goes wrong. It also means you have the ability to run separate apps on the pi that don't need to be running off the same package versions, should you ever want to do that.\nHowever, it's certainly possible not to use one and you might get away with it and not have any issues. But if you want to improve the reliability and maintainability of your app and pi, and considering how easy it is to setup and use, it seems like a poor design decision not to use it.","Q_Score":1,"Tags":"python,django,raspberry-pi,virtualenv","A_Id":59240818,"CreationDate":"2019-12-08T20:12:00.000","Title":"Python virtualenv when deploying webapp to raspberry pi?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a python program in which I am trying to do a post sending file contents as a string.  I am doing the following:\nheader 'content-type':'multipart\/form-data'\ndata {file1: filedata}\nfiledata is a string I build by reading a file putting the contents in the string\nwhen I make the post call I get a 500 back and looking in the catalina log I see the error \"couldn't determine the boundary from the message\".\nthe thing is when I put this in insomnia it works properly and the catalina log shows the header had ; boundary=X-INSOMNIA-BOUNDARY appended to the content-type I defined\nWhy would this work for insomnia but not when I do it in python using requests?  This is my requests call (auth is set to None)\nresponse = requests.post(url, data=data, headers=headers, auth=auth, timeout=REQUEST_TIMEOUT, verify=False)\nheaders = 'content-type':'multipart\/form-data\ndata = {'timepunch': 'datastring'}","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":136,"Q_Id":59250063,"Users Score":0,"Answer":"I found my problem - when sending a file I need the request to be files-data instead of data=data - not sure exactly what happens in the background but this resolved my issue","Q_Score":1,"Tags":"python","A_Id":59251085,"CreationDate":"2019-12-09T13:36:00.000","Title":"Python Post Getting couldn't determine the boundary from the message","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm reading the book Django 2 by Example and am getting confused at one point there's a line {% with comments.count as total_comments %} where the author goes on to explain \n\nWe are using the Django ORM in the template, executing the QuerySet comments.count()...The {% with %} template tag is useful to avoid\n  hitting the database or accessing expensive methods multiple times.\n\nI thought templates are using whatever context is passed to them and no database access occurs?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":433,"Q_Id":59250832,"Users Score":2,"Answer":"I thought templates are using whatever context is passed to them and no database access occurs?\n\nWell it uses what is passed through the context. But a QuerySet is performed lazily. That means that if you for example pass MyModel.objects.all() it will not make the query, or at least not immediately.\nIt is only when you \"consume\" the queryset, for example by iterating over it, or by calculating the length of the queryset, that you will make a query to the database. A template can thus trigger several database queries. In fact N+1 problems often are caused by templates that iterate over one QuerySet of objects, and then query over a  related manager as well.\nA .count() on a QuerySet is evaluated eagerly as well, so if you have somequeryset, and you call .count() that will trigger a database query. If that is done in a loop, or at different locations in the template, then it will thus reduce in more queries to the database. By using a {% with \u2026=\u2026 %} statement, you will make the query when the template evaluates the {% with \u2026=\u2026 %} part, and then you can reuse that variable multiple times.","Q_Score":2,"Tags":"python,django,django-models,django-templates,django-queryset","A_Id":59251029,"CreationDate":"2019-12-09T14:21:00.000","Title":"Does the use of Django template tags execute Querysets?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"After updating to Spyder 4.0.0 (from Spyer 3.7) I get following error on scripts that worked fine before:\nFile \"C:\\Users\\Usuario\\Anaconda3\\lib\\zipfile.py\", line 1395, in getinfo\n    'There is no item named %r in the archive' % name)\nKeyError: \"There is no item named '[Content_Types].xml' in the archive\"\nWith python 3.7.4 I did not get this error. Now with 3.7.1 I have this issue. \nAny suggestion? where can I find the root of the issue?\nThank you.\nBest regards,","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":149,"Q_Id":59257452,"Users Score":1,"Answer":"Issue solved: the excel file was corrupted","Q_Score":0,"Tags":"python,spyder","A_Id":59272780,"CreationDate":"2019-12-09T22:15:00.000","Title":"Key error after updating Spider and Anaconda","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Seemingly out of the blue, I'm unable to access my datastore from my Google App Engine project.\nOne moment everything works, the next I'm getting \"StatusCode.PERMISSION_DENIED\" errors.\nI've properly installed the json key from a \"owner\" service account, set it up in my GOOGLE_APPLICATION_CREDENTIALS environment variable.\nI've even set up a new project, with the same results.\nSince yesterday, it just won't work.\nI raked the whole internet. Where shall I look?\nMost appreciated.","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":85,"Q_Id":59264091,"Users Score":2,"Answer":"I found it: I was importing a third-party library that was setting the GOOGLE_APPLICATION_CREDENTIALS environment variable to its own json file, overwriting access of the main project to the owner account.","Q_Score":0,"Tags":"python,google-app-engine,google-cloud-datastore,google-iam","A_Id":59264953,"CreationDate":"2019-12-10T09:32:00.000","Title":"Google Cloud Datastore: StatusCode.PERMISSION_DENIED with owner service account","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am running some test scripts and while it is running at the background I want to do my other jobs on excel or another web page? But sometimes I got same errors since the selenium can not find the specific field to click? What can be the reason? Is it not working well at the background?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":209,"Q_Id":59287278,"Users Score":0,"Answer":"To run selenium concurrently while i am working on other projects i just run it in a headless mode, that tends to work most of the time. \nThe thing is that you have to have completed the building of the script before you do this otherwise debugging could be a nightmare if you are new or fairly new to selenium web-driver","Q_Score":0,"Tags":"python,selenium,testing,automation,automated-tests","A_Id":59287821,"CreationDate":"2019-12-11T13:51:00.000","Title":"Can selenium python work good at background while I am doing other processes on main page?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have been trying to install Pandas on my Azure App Service (running Flask) for a long time now but nothing seems to work.\nI tried to use wheel, created a wheelhouse directory manually and tried to install the relevant Pandas .whl file (along with its dependent packages) but it still doesn't work. This approach gives me the following error - \n\"Could not find a version that satisfies the requirement\"\n\"No matching distribution found for ...\"\nA simple \"pip install pandas\" also doesn't work - when I do this, in my Kudu Bash client the command gets stuck on \"Cleaning up..\" and nothing gets installed.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":537,"Q_Id":59287420,"Users Score":0,"Answer":"I solved this by using the SSH terminal instead of the Kudu terminal. I find no reason why it was not working in the Kudu Remote Execution terminal, but using \"pip install pandas\" in Azure's SSH terminal solved it.","Q_Score":0,"Tags":"python,azure,azure-web-app-service","A_Id":59301763,"CreationDate":"2019-12-11T13:58:00.000","Title":"Azure Installing Pandas Module","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am trying to connect a R Shiny app to a python Flask app, so that I can run my Shiny app on R studio connect and access my Flask app which in turn runs on localhost.\nMy initial attempt was a GET request from shiny to Flask to bring the html code onto my R site. This worked for displaying the html code, but sending elements back to the python side e.g. forms or pressed buttons are more complicated.\nI was wondering whether there are other solutions that do not involve interference with the underlying network system such as IP forwarding?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":274,"Q_Id":59287572,"Users Score":0,"Answer":"Just in case anyone will ever run into a similar question. In the end I put the url generated by Flask in an R shiny iframe.","Q_Score":0,"Tags":"python,html,r,flask,shiny","A_Id":59627760,"CreationDate":"2019-12-11T14:06:00.000","Title":"How to access a python Flask app through R shiny?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to listen to an existing SQS queue through Celery.\nI have already done publishing to Queue via celery and then consuming from that queue through workers and tasks bound to that queue.\nHowever, I am unable to figure out how to consume from an SQS queue if the publisher is a non-celery Django application. There is no such information available on the internet regarding this or at least I am unable to locate it. Can someone please guide me to some documentation for doing this?","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":410,"Q_Id":59306628,"Users Score":1,"Answer":"If I understood correctly what you want to do I have bad news for you - it is not possible. Celery can only consume own messages. If your Django application needs to send some task to the Celery cluster using SQS as broker, it needs to instantiate a Celery application object, and use it to send tasks.","Q_Score":1,"Tags":"python,django,celery,amazon-sqs","A_Id":59307003,"CreationDate":"2019-12-12T14:21:00.000","Title":"How to listen to already existing SQS queue with Celery and Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I want to listen to an existing SQS queue through Celery.\nI have already done publishing to Queue via celery and then consuming from that queue through workers and tasks bound to that queue.\nHowever, I am unable to figure out how to consume from an SQS queue if the publisher is a non-celery Django application. There is no such information available on the internet regarding this or at least I am unable to locate it. Can someone please guide me to some documentation for doing this?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":410,"Q_Id":59306628,"Users Score":0,"Answer":"I would not use Celery. I would use boto3 directly, in a custom Django management command, to long-poll the queue and parse \/ route the incoming messages.\nCelery would give you nothing, and would only increase the complexity of implementation.","Q_Score":1,"Tags":"python,django,celery,amazon-sqs","A_Id":72195151,"CreationDate":"2019-12-12T14:21:00.000","Title":"How to listen to already existing SQS queue with Celery and Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"How can we do count() for firebase database in python ?\nas for example ..\ncount = db.child(\"users\").get().count()","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":759,"Q_Id":59334339,"Users Score":1,"Answer":"You can use the len function for this as:\nlen(db.child('users').get().val())","Q_Score":0,"Tags":"python,firebase,firebase-realtime-database,pyrebase","A_Id":59334461,"CreationDate":"2019-12-14T10:41:00.000","Title":"How to count firebase database in python using pyrebase?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I never did this before so I am sorry if my question is not very clear (I am not sure what the name of each step is). I have a code which is supposed to give me an interactive interface in a browser (similar to jupyter notebook I guess). After I run the code (I am using a remote machine, not my personal computer) one of the messages is: Running on http:\/\/127.0.0.1:5000\/ When I try to enter that in my browser I am getting a This site can\u2019t be reached error. Also the terminal window used to run this code isn't active anymore (it is similar to when I run a jupyter notebook). What should I do to get access to that interactive windows created? Thank you!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":17,"Q_Id":59341519,"Users Score":0,"Answer":"http:\/\/127.0.0.1 is called loopback ip and is equivalent to localhost.\nThe remote machine is hosting the program on localhost, i.e., you cannot access it from other machine unless you host it on the machine's public ip.   \nEasiest way to do that is to host on 0.0.0.0:5000. where 5000 is just a port and can be almost anything. Now that would probably print Running on http:\/\/0.0.0.0:5000\/ but you need to access it with the machine's public ip.","Q_Score":0,"Tags":"python,browser","A_Id":59342467,"CreationDate":"2019-12-15T05:48:00.000","Title":"Get the output of a code on a remote machine in a browser","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have struggled with what language formats I need to pass to translation.activate and I asked a detailed question but then I dug up the solution from the source. See it in my answer.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":85,"Q_Id":59348401,"Users Score":1,"Answer":"The format is: \n\nyou can supply a plain language ('hu', 'pt', 'en', 'de' etc.)\nyou can supply a language and a \"territory\" ('pt-pt', 'pt-br', 'en-gb')\nnote that django is buggy if you use other formats (eg. 'pt_br') since it does not properly recognise the language-territory relation. (I haven't tried but looking at the code I also think 'pt-BR' format\nshould work. It is too bad that we don't have a verbose option to see django's guesses.)\n\nDjango checks the directories in the following order (assuming you enter 'pt-br'):\n\nlanguage_territory.isoencoding ('pt_BR.ISO8859-1'), \nlanguage_territory ('pt_BR') -- but note that if a territory is longer than 2 characters, then only the first character gets capitalized (eg. 'zh_Hans')!\nlanguage.encoding ('pt.ISO8859-1')\nlanguage ('pt')\nfalling back to default language and trying its 4 possible directory (usually ['en_US.ISO8859-2', 'en_US', 'en.ISO8859-2', 'en'])\n\nThis was missing in Django documentation, now you can all find it here. Good luck.\nOne more thing:\nYou can put a locale directory into each app directory. I recommend you to break up the translation into smaller units - it is easier to track the translations later.","Q_Score":1,"Tags":"python,django,django-i18n","A_Id":59348777,"CreationDate":"2019-12-15T21:55:00.000","Title":"What language format does django translation.activate() accept?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Case 1: Class is coded in code.py. Say class contains a couple of instance variables and an instance method that does some processing and returns the result. In flask endpoint, I am importing the class from code.py module and instantiating the class and calling the object.mtdname()\nCase 2: in code.py, along with the same class as in case 1, I define a function (do_work) outside the class. The do_work function instantiates the class and calls object.mtdname() method. In flask endpoint, I import only the do_work function from code.py. when do_work is invoked it will create the object and return the result.\nWhat are pro and cons of using case 1 or 2?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":31,"Q_Id":59351107,"Users Score":0,"Answer":"Generally speaking, I would prefer case 1 because case 2 requires an additional test that really doesn't test anything new.  So for the purposes of reducing code, I would go with Case 1 unless do_work did something other than just call the one method.","Q_Score":0,"Tags":"python,python-3.x","A_Id":59351193,"CreationDate":"2019-12-16T05:43:00.000","Title":"Instantiate class and call its functions via a function in the same module as class declaration?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm having slight issues when it comes to running a crawler through my s3 buckets. My folders have data that was dumped from redshift that was sliced into many different files. These files naming convention go as the following:\ndump_0000_part_00.gz,   dump_0001_part_01.gz ....\nHowever when my crawler fetches the metadata in this folder, it instead makes a few hundred tables, thinking each one of these sliced files is its own table. Is there a way to tell the crawler to group all these sliced files into ONE catalog table?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":130,"Q_Id":59363093,"Users Score":0,"Answer":"When configuring the Crawler (or editing an existing one), under the Output section, expand Grouping behavior for S3 data (optional) and select Create a single schema for each S3 path","Q_Score":0,"Tags":"python,database,amazon-web-services,amazon-s3,aws-glue","A_Id":59365512,"CreationDate":"2019-12-16T19:26:00.000","Title":"Adding only one of s3 partitioned files to AWS Glue","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm new to Django and curious how the authentication of Rest Framework works.\nSo as I understand, the flow of authentication is:\n    Frontend sends request with username and password > Backend (Django) sends back token > From then on frontend send this token in header to authenticate.\nBut because anyone can see the header I send, so how is this safe?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":48,"Q_Id":59363738,"Users Score":1,"Answer":"For this to be secure you should only ever authenticate over an https connection. When using an https connection the header\/token\/cookie\/whatever will be encrypted.","Q_Score":1,"Tags":"python,django,django-rest-framework","A_Id":59364017,"CreationDate":"2019-12-16T20:19:00.000","Title":"Authentication with REST Framework Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have been searching all over internet for solution but couldn't find any. I am using captcha solving api to solve captcha in scrapy-splash but when captcha page appears, scrapy sends request to api while trying to scrape next page. This is happening due to concurrency. I have tried CONCURRENT_REQUESTS=1 but same result. I have tried setting wait and pausing engine but in most cases, two or more threads arrive exactly at same line and so while first thread pause engine, 2 or more thread also pauses engine and tries to solve captcha. Can anyone please suggest anything to solve this issue.\nsorry if you didn't understand, Please comment any questions you have, I reply in seconds","AnswerCount":1,"Available Count":1,"Score":-0.1973753202,"is_accepted":false,"ViewCount":88,"Q_Id":59368079,"Users Score":-1,"Answer":"Use a blocking HTTP client library (e.g. Requests) for your API calls.","Q_Score":0,"Tags":"python,scrapy,scrapy-splash","A_Id":59377590,"CreationDate":"2019-12-17T05:27:00.000","Title":"I am having problem in scrapy concurrency with captcha","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have been trying to pull out financial statements embedded in annual reports in pdf and export them in excel\/CSV format using python But I am encountering some problems:\n1. A specific Financial statement can be on any page in the report. If I were to process hundreds of pdfs, I would have to specify page numbers which takes alot of time. Is there any way through which the scraper knows where the exact statement is?\n2. Some reports span over multiple pages and the end result after scraping a pdf isnt what I want\n3. Different annual reports have different financial statement formats. Is there any way to process them and change them to a specific standard format?\nI would also appreciate if anyone have done something like this and can share examples.\nPs I am working with python and used tabula and Camelot","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2226,"Q_Id":59382641,"Users Score":0,"Answer":"I had a similar case where the problem was to extract specific form information from pdfs (name, date of birth and so on). I used the tesseract open source software with pytesseract to perform OCR on the files . Since I did not need the whole pdfs, but specific information from them, I designed an algorithm to find the information: In my case I used simple heuristics (specific fields, specific line number and some other domain specific stuff), but you can also use a machine-learning approach and train a classifier which can find the needed text-parts. You could use domain-specific heuristics as well, because I am sure that a financial statement has special vocabulary or some text markers which indicate its beginning\/its end. \nI hope I could at least give you some ideas how to approach the problem\nP.S.: With tesseract you can also process multipage pdfs. To 3) - Machine learning approach would need some samples to learn a good generalization of how a financial statement may look like.","Q_Score":0,"Tags":"python,pdf-scraping","A_Id":59383076,"CreationDate":"2019-12-17T21:52:00.000","Title":"Extraction of financial statements from pdf reports","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created a script that can run the python django application. I run this script using pm2.\nI do pm2 start scripts.sh, it works properly but after some time my application doesn't work and displays an error like this\n\nthe runtime process for the instance running on port 37001 has unexpectedly quit**\n\nI show the log using pm2 logs, it displays an error like this\n\nscript.sh had too many unstable restarts (16). Stopped. \"errored\"\n\nHow to resolved it? Can anyone help me?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1539,"Q_Id":59385608,"Users Score":0,"Answer":"I had the same issue and resolved with:\npm2 kill\nrm -rf node_modules\nnpm i\npm2 start index.js\nsudo shutdown -r now","Q_Score":0,"Tags":"python-2.7,pm2,django-errors,pm2-logrotate","A_Id":72179224,"CreationDate":"2019-12-18T04:46:00.000","Title":"pm2 crash with too many unstable restarts (16). Stopped. \"errored\" in python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Django project with about 100 class-based views (to now) in a views.py file.\nNow managing the views is getting harder. If I put each view in a separate .py file and import all in views folder __init__.py, does it affect the performance?\nMy concern is performance, not code style.\nWhat about DRF class-based views and serializers?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":194,"Q_Id":59391431,"Users Score":2,"Answer":"Here are two points:\n\n1.does it have effect on the performance?\n\nNo, or only marginally. Also, It might take some extra time to load all these files into memory (since each file needs to be opened), hence writing these views in individual files indeed might take a few cycles extra. So first of all this is bad idea for increasing performance. \nBut that will only happen when you start the webserver. Once the files are loaded, it does not make much difference in what module the view is defined. The interpreter will simply call the function.\nThat being said, Python is not a language designed to take the absolute most of the CPU anyway. The idea of Python is, to some extent, Programmer convenience over machine performance. Due to Python's very dynamic nature, it will often not result in the fastest programs. The idea is to offer a programmer a convenient environment. Often if you need more processing power, you can buy an extra server, whereas hiring an extra developer is often more costly. Therefore developing a webserver in Django will likely not result in the fastest response times, but it will likely make your job simpler to implement such server.\n\n\nDjango's Architecture\n\n\nYou should also consider Django's architecture. It's a bad exercise to try to change this architecture. In this architecture, everything is designed to avoid duplication(DRY). And if another developer intends to deliver your project, he or she will be able to take it in as little time as possible. As a result, it seems better to keep this architecture and put all your CBVs in one views.py.","Q_Score":3,"Tags":"python,django,performance,django-rest-framework,django-views","A_Id":59393052,"CreationDate":"2019-12-18T11:51:00.000","Title":"Will it hurt performance if each view class is moved to a separate .py file?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"To be very honest, I've played with matplotlib a little but iam new to django.\nI have wandered all over google to search to plot a line graph in django using csv.\nUnfortunately i couldnt find anything apart from 'bokeh' and 'chartit'. Although they arent very useful to help me make a start.\nMy Goal: I need to plot a line graph, where x-axis have dates, y-axis have some numbers.\nNow, what should my views.py look like? What thing should i include in template?\nAnyone please help me out, or send me some provide some video tutorial to start with","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":139,"Q_Id":59398219,"Users Score":0,"Answer":"as pointed out by @roganjosh, you'll render the graph using a js library.\nSo in the views.py you'll have to add your data to the context, and then render it in the template using a js library. I personally like plotly.js, they have a neat and easy to use interface. D3.js is also a very popular data visualisation library.","Q_Score":0,"Tags":"python,django","A_Id":59398539,"CreationDate":"2019-12-18T18:35:00.000","Title":"Line Graph in django template","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"A website has been developed on a local ubuntu machine using python flask. The website runs fine on ubuntu at 127.0.0.1:5000. This website is supposed to go live on a godaddy server for which there is cpanel access. How to do it?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":348,"Q_Id":59425136,"Users Score":1,"Answer":"If it's a shared hosting solution, Answer to your question is NO, you can't do it. In a shared hosting environment Godaddy using only a PHP Stack. so you won't be able to use python there. Either go with VPS and configure your server. or go with a cloud service provider like Digital ocean, AWS, Linode etc.,","Q_Score":0,"Tags":"python,flask,cpanel,godaddy-api","A_Id":59425216,"CreationDate":"2019-12-20T12:17:00.000","Title":"Flask cpanel godaddy server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have inserted data into table from postgresql directly. Now when I try to insert data from django application, it's generating primary key duplication error. How can I resolve this issue?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":81,"Q_Id":59425728,"Users Score":0,"Answer":"I think problem is not in database. please check your django code probably you use get_or_create","Q_Score":0,"Tags":"python,django,database,postgresql","A_Id":59428772,"CreationDate":"2019-12-20T13:02:00.000","Title":"i have 600 records in my postgres database, now when i inserted from django it's generating primary duplication error","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have inserted data into table from postgresql directly. Now when I try to insert data from django application, it's generating primary key duplication error. How can I resolve this issue?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":81,"Q_Id":59425728,"Users Score":0,"Answer":"Run\npython manage.py sqlsequencereset [app_name]\nand execute all or just one for the required table SQL statements in the database to reset sequences.\n\nExplanation:\nYou probably inserted with primary keys already present in it, not letting postgresql to auto-generate ids. This is ok.\nThis means, internal Postgresql sequence used to get next available id has old value. You need to rest with sequence to start with maximum id present in the table.\nDjango manage.py has command intended just for that - print sql one can execute in db to reset sequences.","Q_Score":0,"Tags":"python,django,database,postgresql","A_Id":59425929,"CreationDate":"2019-12-20T13:02:00.000","Title":"i have 600 records in my postgres database, now when i inserted from django it's generating primary duplication error","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using unit prices in Purchases with 4 decimal places like 12.1234 LE, but in point of sale I use 2 decimal places like 12.12 LE.\nI tried to change \"Unit price\" and \"Account\" decimal accuracy to 4 in (Settings\\Database Structure\\Decimal Accuracy) expected behavior is 12.1234*1000=12123.4 but the line real subtotal was 12120.00 this is because Currency rounding factor is 2 decimal places (Invoicing\\Accounting\\Currencies\\LE).\nWhen I tried to change currency price rounding factor to 4 this causes issues in Point of sales orders payment, as I found a lot of draft payments \"Status: NEW\" this is because the user in Point of sales enter prices with 2 decimal point which is necessary for ease of usage and for the client view.\nI am trying to make a  different Price rounding factor for POS than accounting, is this is the right way? and is there any other ideas?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":359,"Q_Id":59430213,"Users Score":0,"Answer":"Ok, I see no one made a comment!! May be my question is not clear enough.\nAny way I put this answer for any one who faces same problem, I made a work around, simply I created another currency with Rate=1 with price accuracy= 0.0001 I mean 4 decimal places, then I changed all partner to use this currency by changing (Supplier currency=\"this new currency\").\nThen when I make a PO and choose the vendor => currency changes to this currency and decimal places becomes 4 with no issues on POS as it uses the default currency which is 2 decimal places.\nBy the way this currency does not appear at all in the reports because out of the PO all the payment is automatically with the default currency.","Q_Score":0,"Tags":"python,odoo-11","A_Id":59451094,"CreationDate":"2019-12-20T19:05:00.000","Title":"Odoo 11: How to use different Price accuracy for POS and Purchasing?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am getting the following error: \n\nUnable to import module '': No module\n  named 'regex._regex'\n\nThe AWS Lambda deployment package runs just fine without import htmldate statement (the module I want to use) which in turn requires regex.\nAlso the code runs fine locally.  \nSo this seems to be a problem running regex on AWS Lambda.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":1951,"Q_Id":59438843,"Users Score":1,"Answer":"A new version of htmldate makes some of the dependencies optional, regex is such a case. That should solve the problem. (FYI: I'm the main developer of the package.)","Q_Score":3,"Tags":"regex,python-3.x,amazon-web-services,aws-lambda","A_Id":59722099,"CreationDate":"2019-12-21T18:34:00.000","Title":"How can I import regex on AWS Lambda","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have the logic for email verification, but I am not sure how to make it such that only after clicking the link on the verification email, the user is taken to the second page of the form, and only after filling the second part the user is saved.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":106,"Q_Id":59452271,"Users Score":1,"Answer":"I would say that much better idea is to save user to database anyway, but mark him as inactive (simple boolean field in model will be enough). Upon registration, before confirming email mark him as inactive and as soon as he confirms email and fills second part of your registration form that you mentioned change that boolean value to true. If you don't want to keep inactive users data in your database, you can set up for example cron, that will clean users that haven't confirmed their email for few days.","Q_Score":1,"Tags":"python,django,django-models,django-forms,django-authentication","A_Id":59452384,"CreationDate":"2019-12-23T08:37:00.000","Title":"How to create a registration form in Django that is divided into two parts, such that one call fill up the second part only after email verification?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was trying to study sphinx python documentation, i was struggling to make an html inside of my directory. I already try it to my cmd prompt but the error shows. \n$ make html\nP.s I already install Python and NodeJs and Git (incase)","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1806,"Q_Id":59452797,"Users Score":0,"Answer":"I get my own answer on my own question.\nYou should locate your own directory and make sure you sphinx-build in your folder","Q_Score":0,"Tags":"python-sphinx","A_Id":59483114,"CreationDate":"2019-12-23T09:22:00.000","Title":"'make' is not recognized as an internal or external command, operable program or batch file. [Sphinx]","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"A Django-based service that I'm working on allows users to upload media files via REST API or Django admin but does not provide or use any static files (like css styles, js libraries, etc.).\nMedia files are stored in specific fields in database and use S3 bucket as storage backend so server itself does not directly serve any files at all.\nHaving such a case is running collectstatic command required every time application is being deployed?\nThought the concept of static and media files in Django application is rather simple I'm still confused about whether configurations for them should be somehow related?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":105,"Q_Id":59452874,"Users Score":0,"Answer":"Your Django-based service does not need collectstatic at all.\nQuestion is about django admin - because admin app uses static content css\/img\/js.\nDo you use django admin in production? \n\nIf yes - then you need to run collectstatic command it, otherwise admin site will be unstyled or totally broken because of missing js files.\nIf no - then you collectstatic command has no use for you.","Q_Score":0,"Tags":"python,django","A_Id":59453418,"CreationDate":"2019-12-23T09:28:00.000","Title":"Is collectstatic command necessary if application only serves media files?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"A Django-based service that I'm working on allows users to upload media files via REST API or Django admin but does not provide or use any static files (like css styles, js libraries, etc.).\nMedia files are stored in specific fields in database and use S3 bucket as storage backend so server itself does not directly serve any files at all.\nHaving such a case is running collectstatic command required every time application is being deployed?\nThought the concept of static and media files in Django application is rather simple I'm still confused about whether configurations for them should be somehow related?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":105,"Q_Id":59452874,"Users Score":1,"Answer":"As Django won't serve the staticfiles when the DEBUG is False (through deployment), if you want the css, js and other static files (at least in the admin, in your case), you need to run collectstatic.\nSo if you want django admin to be like your development environment (with css and images), you need it.","Q_Score":0,"Tags":"python,django","A_Id":59452932,"CreationDate":"2019-12-23T09:28:00.000","Title":"Is collectstatic command necessary if application only serves media files?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I had recently updated my Django version from 1.11 to 3.0. when I want to create a project using python-admin startproject mysite I am getting error as \n\nImportError: No module named django.core\n\nI tried importing the Django in python3 console it is working.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":350,"Q_Id":59466475,"Users Score":0,"Answer":"Try using django-admin instead of python-admin. I made a new virtual environment, downloaded django via pip and django-admin startproject myapp worked. Don't forget to activate the virtual environment","Q_Score":0,"Tags":"python,django","A_Id":59469108,"CreationDate":"2019-12-24T09:18:00.000","Title":"ImportError: No module named django.core even I getting when I am importing django in python console","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying connect to internal Jira instance use my AWS lambda function. The lambda cannot connect to this web-resource because VPN is required. (all work properly on my local machine under VPN connection).\nPlease any suggestion regarding this issue ?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":166,"Q_Id":59468906,"Users Score":0,"Answer":"Since there is an AWS Direct Connect connection between an Amazon VPC and your corporate network, the AWS Lambda function can be configured to connect to the VPC.\nThe Lambda function can then connect to the JIRA instance on the corporate network by using the private IP address of the JIRA instance.\nYou might be able to configure the VPC to defer to your corporate DNS server to resolve the DNS Name into the IP address, but I would recommend you start by using the private IP address itself to ensure that connectivity is working.","Q_Score":0,"Tags":"python,aws-lambda,python-jira","A_Id":59478372,"CreationDate":"2019-12-24T12:31:00.000","Title":"How connect to internal Jira instance via AWS lambda","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying connect to internal Jira instance use my AWS lambda function. The lambda cannot connect to this web-resource because VPN is required. (all work properly on my local machine under VPN connection).\nPlease any suggestion regarding this issue ?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":166,"Q_Id":59468906,"Users Score":0,"Answer":"It would be best to use SQS messaging.\n\nDefine a message format\nFrom your lambda function, publish a message when you want to query something\nHave an app\/worker running inside your network, which is listening to your SQS queue.\nYour app\/worker receives that message and can query to your Jira instance.\nWhen the result is ready, your app\/worker can publish it on other SQS queue\nYou can receive the message in another lambda function, or If you want to receive the response in a same lambda function, you can poll for messages and wait till you get your desired message.\nIf you have multiple such lambda functions, or many requests going on. You can put a request-id in messages. So, when receiving a message, you can come to know which is your desired message and delete that one only.","Q_Score":0,"Tags":"python,aws-lambda,python-jira","A_Id":61316127,"CreationDate":"2019-12-24T12:31:00.000","Title":"How connect to internal Jira instance via AWS lambda","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I really don't know what is the best practice fetching users with keycloak in an frotend application. I'm currently building an Vue.js frontend application which works with the keycloak.js lib. I also have a backend written in Python. \nDo I need to fetch users first by my backend and afterwards fetch them on the frontend? Or otherwise fetch them directly on the frontend. \nWhat should you do?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":254,"Q_Id":59469062,"Users Score":0,"Answer":"Best practice in my opinion is:\nCreate a CMS, Database or API-endpoint where to query the data from in your front-end.\nThis will only query data when needed.","Q_Score":0,"Tags":"python,vue.js,openid-connect,keycloak","A_Id":59469098,"CreationDate":"2019-12-24T12:47:00.000","Title":"Best practice fetching users keycloak","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I really don't know what is the best practice fetching users with keycloak in an frotend application. I'm currently building an Vue.js frontend application which works with the keycloak.js lib. I also have a backend written in Python. \nDo I need to fetch users first by my backend and afterwards fetch them on the frontend? Or otherwise fetch them directly on the frontend. \nWhat should you do?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":254,"Q_Id":59469062,"Users Score":3,"Answer":"There is no best practice in such a task. It depends on what kind of business logic you need. If you just need to list Keycloak users in a table go with frontend as it is faster to implement. If you need to hide some sensitive user data or do not want to give frontend users access to Keycloak API go with backend.\nAlso be aware that through the API you can do anything the same as through the admin console. Users of your frontend application can get access that they should not have.\nAs an example, in Keycloak admin console, all requests from the frontend are sent directly to the API.","Q_Score":0,"Tags":"python,vue.js,openid-connect,keycloak","A_Id":59469750,"CreationDate":"2019-12-24T12:47:00.000","Title":"Best practice fetching users keycloak","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Blueprism gives the possibility to spy elements (like buttons and textboxes) in both web-browsers and windows applications. How can I spy (windows-based only) applications using Python, R, Java, C++, C# or other, anything but not Blueprism, preferrably opensource.\n\nFor web-browsers, I know how to do this, without being an expert. Using Python or R, for example, I can use Selenium or RSelenium, to spy elements of a website using different ways such as CSS selector, xpath, ID, Class Name, Tag, Text etc.\nBut for Applications, I have no clue. BluePrism has mainly two different App spying modes which are WIN32 and Active Accessibility. How can I do this type of spying and interacting with an application outside of Blueprism, preferrably using an opensource language?\n\n(only interested in windows-based apps for now)\nThe aim is of course to create robots able to navigate the apps as a human would do.","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":497,"Q_Id":59470191,"Users Score":0,"Answer":"There is a free version of Blue Prism now :) Also Blue Prism uses win32, active accessibility and UI Automation which is a newer for of the older active accessibility.\nTo do this yourself without looking into Blue Prism you would need to know how to use UIA with C#\/VB.new or C++. There are libraries however given that Blue Prism now has a free version I would recommend using that.  Anything specific can be developed withing a code stage within Blue Prism.","Q_Score":1,"Tags":"c#,python,windows,blueprism,rpa","A_Id":59556005,"CreationDate":"2019-12-24T14:27:00.000","Title":"Blueprism-like spying and bot development","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on a group project which entails generating many reports. We were thinking of using amazon echo. We would ask alexa to fetch the reports from a particular tine period or something like that.\nWe plan on doing so using Python.\nIt is possible using ASK(Alexa Skills Kit) SDK to achieve this goal ? Like, can alexa tap into our application and fetch all that we want. We do not want to use anything else other than Amazon echo.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":31,"Q_Id":59476035,"Users Score":0,"Answer":"I think it's possible you need to create a custom skill for that, there are somethings that you might want to consider though,\n\nHow long is the report: it will work fine if reports are small and giving you some brief overview or some numbers. you don't wanna listen to long report on that robotic voice.\nName of reports: sometimes Alexa will not understand or misunderstood the name you're trying to say if it's complex one.\nmeaning of tap into your application: In Alexa skill you can write custom logic just like you write for a software so If there's API to fetch reports then It can be done. The skill will call API and pass the data that you say to that skill, data like to date, from date etc.","Q_Score":0,"Tags":"python,alexa-skills-kit","A_Id":59519917,"CreationDate":"2019-12-25T07:06:00.000","Title":"Using amazon alexa echo in my application","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am rather new to Django and I need to fetch some data from a website. For example I want the top ten posts of the day from Reddit. I know of a \"request\" module for the same.But I am not sure where and how should I implement it and will it be important to store the data in a model or not.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":638,"Q_Id":59479195,"Users Score":0,"Answer":"You can create a helper class named like network.py and implement functions to fetch the data.\nIf you want to store them in the database you can create appropriate models otherwise you can directly import and call the function and use the data returned from network.py in your view.","Q_Score":1,"Tags":"django,python-requests","A_Id":59480606,"CreationDate":"2019-12-25T14:11:00.000","Title":"How can I fetch data from a website to my local Django Website?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Here is my requirement.\n\nExternal program will get some signals from subprograms each min or specific intervals.\nI want that external program to call Alexa and pass this information\nwho connect with this skill set should hear automatically this output rather than asking Alexa what is the status","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":146,"Q_Id":59485441,"Users Score":0,"Answer":"It's not possible to do that with Alexa. Alexa can be activated only using the voice and it's by design.","Q_Score":0,"Tags":"python,api,response,external,alexa","A_Id":60620377,"CreationDate":"2019-12-26T07:47:00.000","Title":"How to call Alexa intent from external python code and alexa device to announce","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"django.core.exceptions.ImproperlyConfigured: You\u2019re using the staticfiles app without having set the STATIC_ROOT setting to a filesystem path. \nHaving this error despite me having set the STATIC_ROOT: \nSTATIC_ROOT = os.path.join(BASE_DIR, 'staticfiles')","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":34,"Q_Id":59492543,"Users Score":0,"Answer":"Check the static file root. If it's on correct location. For heroku try to put that file on git. I am assuming it's a blank directory so it's not being pushed to git repo. Put .keep kind of file and add\/commit and try. Hope it will solve your issue.","Q_Score":0,"Tags":"python,django,heroku","A_Id":59492596,"CreationDate":"2019-12-26T19:16:00.000","Title":"Having an Error with STATIC_ROOT when using heroku in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to Flask app development, i need some clarifications on using database with flask app. \nWe have a MySQL db which has some metrics, currently we generate some reports using python using MySQL.connector.\nWe have python modules\/functions to fetch the data from the db using mysql.connector and populate a dictionary which has data to be put in the report. \nMy question is can i use the same python module in the app.py (if this is where i create the app) and get the data as dictionary and pass it to some template html to render the report?\nIf i can do this, what is the advantage of using Flask-MySql or Flask-SqlAlchemy and doing the app.config[] things which are mentioned in many tutorials?\nI am trying to understand what should be used when.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":676,"Q_Id":59496972,"Users Score":0,"Answer":"well for ur case if ur have not much experience in sql i prefer u to use orm like Sqlalchemy. for flask there is an extension call flask-sqlalchemy.it uses python like syntax without using direct sql it is very easy to learn and well documented.but not recommended for advanced user cases.If u want to pass pure sql queries through flask and to have more capablities in database site better to use flask extension for mysql flask-mysql.It depend on ur requirement,capability and user case.","Q_Score":1,"Tags":"flask,mysql-connector-python,flask-mysql","A_Id":59499709,"CreationDate":"2019-12-27T06:38:00.000","Title":"what is the Difference between using mysql connector and Flask-Mysql in Flask app?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am going through a Django tutorial but it's an old one. The videos were all made using Django 1.11 and Python 3.6. Problem is I have installed python3.8 in my machine. So I was trying to create virtualenv with python version 3.6. But as python 3.6 is not available in my machine, I couldn't do that. At this point I was wondering even if it is actually possible to have both python 3.6 and python 3.8 in a machine at same time. \nKindly someone help me with this problem or point me to the right resource to understand more on this problem.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":2753,"Q_Id":59505322,"Users Score":1,"Answer":"Yes. You can have both versions installed on single machine. All u need to do is to download Python3.6 from its Official site, set your Interpreter to python3.6 and u r all set.","Q_Score":1,"Tags":"python","A_Id":59505439,"CreationDate":"2019-12-27T19:36:00.000","Title":"Is it possible to have both Python3.6 and Python3.8 versions installed at same time in windows machine","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on an assignment and am stuck with the following problem:\nI have to connect to an oracle database in Python to get information about a table, and display this information for each row in an .html-file. Hence, I have created a python file with doctype HTML and many many \"print\" statements, but am unable to embed this to my main html file. In the next step, I have created a jinja2 template, however this passes the html template data (incl. \"{{ to be printed }}\") to python and not the other way round. I want to have the code, which is executed in python, to be implemented on my main .html file.\nI can't display my code here since it is an active assignment. I am just interested in general opinions on how to pass my statements from python (or the python file) into an html file. I can't find any information about this, only how to escape html with jinja. \nAny ideas how to achieve this?\nMany thanks.","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":96,"Q_Id":59508664,"Users Score":0,"Answer":"Thanks for the suggestions. What I have right now is a perfectly working python file containing jinja2 and the html output I want, but as a python file. When executing the corresponding html template, the curly expressions {{name}} are displayed like this, and not as the functions executed within the python file. Hence, I still have to somehow tell my main html file to execute this python script on my webpage, which I cannot manage so far.\nUnfortunately, it seems that we are not allowed to use flask, only jinja and django.","Q_Score":1,"Tags":"python,html,jinja2","A_Id":59509853,"CreationDate":"2019-12-28T06:27:00.000","Title":"How can I embed a python file or code in HTML?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on an assignment and am stuck with the following problem:\nI have to connect to an oracle database in Python to get information about a table, and display this information for each row in an .html-file. Hence, I have created a python file with doctype HTML and many many \"print\" statements, but am unable to embed this to my main html file. In the next step, I have created a jinja2 template, however this passes the html template data (incl. \"{{ to be printed }}\") to python and not the other way round. I want to have the code, which is executed in python, to be implemented on my main .html file.\nI can't display my code here since it is an active assignment. I am just interested in general opinions on how to pass my statements from python (or the python file) into an html file. I can't find any information about this, only how to escape html with jinja. \nAny ideas how to achieve this?\nMany thanks.","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":96,"Q_Id":59508664,"Users Score":0,"Answer":"You can't find information because that won't work. Browser cannot run python, meaning that they won't be able to run your code if you embed it into an html file. The setup that you need is a backend server that is running python (flask is a good framework for that) that will do some processing depending on the request that is being sent to it. It will then send some data to a template processor (jinja in this case work well with flask). This will in turn put the data right into the html page you want to generate. Then this html page will be returned to the client making the request, which is something the browser will understand and will show to the user. If you want to do some computation dynamically on the browser you will need to use javascript instead which is something a browser can run (since its in a sandbox mode).\nHope it helps!","Q_Score":1,"Tags":"python,html,jinja2","A_Id":59508694,"CreationDate":"2019-12-28T06:27:00.000","Title":"How can I embed a python file or code in HTML?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created a sample project using Django but when I opened the file in IDE it shows error for importing path and include from django.urls module. \nThe error statement is Cannot find reference 'include' in '__init__.py' and Cannot find reference 'path' in '__init__.py'","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":328,"Q_Id":59511708,"Users Score":1,"Answer":"you must use manage.py script to run your project in the right way","Q_Score":0,"Tags":"python,django","A_Id":59517359,"CreationDate":"2019-12-28T14:19:00.000","Title":"Getting error in importing path and include from django.urls","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created a sample project using Django but when I opened the file in IDE it shows error for importing path and include from django.urls module. \nThe error statement is Cannot find reference 'include' in '__init__.py' and Cannot find reference 'path' in '__init__.py'","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":328,"Q_Id":59511708,"Users Score":0,"Answer":"If IDE is Pycharm, try to add source directory in File -> Settings -> Project -> Project structure.","Q_Score":0,"Tags":"python,django","A_Id":59514030,"CreationDate":"2019-12-28T14:19:00.000","Title":"Getting error in importing path and include from django.urls","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have made a Python program that webscrapes IMDB with Beautifulsoup to make a mySQL database with tables of all the top rated movies in the different categories. So far so good. My problem is that I am doing this from Norway, and many of the movie titles are translated to Norwegian. For example, in the top list of IMDB opened from a Norwegian IP adress, \"The Shawshank Redemption\" is translated to \"Frihetens Regn\". I want all the titles in English. Are there maybe some free VPNs that you can activate from Python and that works with Beautifulsoup? Or do anyone have another solution to this?","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":7622,"Q_Id":59511919,"Users Score":2,"Answer":"I agree that using proxies will work better rather than using a vpn. \nHowever, don't go with a free proxy, if you want results. If it's something you can invest in, get a decent paid provider, otherwise most likely nothing good will come out of this, as you will constantly get blocked.","Q_Score":2,"Tags":"python,web-scraping,beautifulsoup,ip,vpn","A_Id":59613310,"CreationDate":"2019-12-28T14:46:00.000","Title":"How to webscrape with VPN in Python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to build a client-Server Application where client is an android device and server is a windows Pc.it would be easy to do socket programming in java for building the complete application.At first, I tried to build the server side completely in python because of the image classifier I wrote in python. but it got me into problems when I started working on the socket.Now, I want to use python trained model in java.\nplease help me out.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":60,"Q_Id":59514643,"Users Score":0,"Answer":"python trained model server serve http api ,accept the image , return classification result","Q_Score":0,"Tags":"java,python,android,sockets,tensorflow","A_Id":59518465,"CreationDate":"2019-12-28T20:33:00.000","Title":"How can i train a Image classifier model with tensorflow in Python and use the trained model in Java application?","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"When flask g keep data on one request and another request follow almost simultaneously (race condition). Will flask g be replaced by new flask g?. And how i can handle if this situation happen. Thank you.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":135,"Q_Id":59521098,"Users Score":0,"Answer":"This is no problem. In flask every simultaneous request will be handled in a separate process. There will be multiple g at a given time (depending on how you configure gunicorn) but every process will have it's own instance.","Q_Score":0,"Tags":"python,flask,gunicorn,race-condition","A_Id":59522177,"CreationDate":"2019-12-29T16:15:00.000","Title":"Can flask g be used with gunicorn?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm building a web-app with Flask and have an philosophical\/architecture related question for all you with more experience than I.\nThe user enters some basic search criteria in my app, my app then queries multiple 3rd-party APIs for information related to the criteria and aggregates the results. \nUltimately, my app will send the user a bi-weekly email with an HTML-formatted table containing the information gathered by the API queries (as rows in the table). The information doesn't need to be stored long term, it becomes obsolete after a week or so there is really no point in storing it. The 3rd party APIs will always be queried anew each week or so. \nInitially I was thinking that I would need to maintain a database table for each user which would aggregate and store the results of their specific API queries. I was planning to create the contents of the emailed table from the rows in the database. \nI'm now wondering if there is a way to accomplish all of this without using a database to temporarily  store the results of the API queries before emailing.\nMy question:  What is the most efficient or optimal means for accomplishing what I'm trying to do? Is it possible to do this without a database for storing the results of the API queries?\nTo recap here was the sequence of operation for the initial concept:\nApp queries API for info --> App stores data returned by APIs in DB Table --> App puts info from DB table into formatted HTML table --> App sends HTML table to user in email --> The next time the App queries the APIs the DB tables would be over-written.\nFor context here are the different packages I'm using:\nFlask 1.1.1\nwerkzeug 0.15.5\nApplication server for both development and production.\ngunicorn 19.9.0\nTesting and static analysis.\npytest 5.1.0\npytest-cov 2.7.1\nmock 3.0.5\nflake8 3.7.8\nData and workers.\npsycopg2-binary 2.8.3\nFlask-SQLAlchemy 2.4.0\nSQLAlchemy 1.3.7\nalembic 1.0.11\nredis 3.3.7\ncelery 4.3.0\nForms.\nFlask-WTF 0.14.2\nWTForms-Components 0.10.4\nWTForms-Alchemy 0.16.9\nPayments.\nstripe 2.35.0\nUtils.\nfaker 2.0.0\nExtensions.\nflask-debugtoolbar 0.10.1\nFlask-Mail 0.9.1\nFlask-Login 0.4.1\nFlask-Limiter 1.0.1\nFlask-Babel 0.12.2\nFlask-Static-Digest 0.1.2","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":34,"Q_Id":59521728,"Users Score":0,"Answer":"If you don't need it in a DB, it seems like you could work with the pandas module, and just use it as a DataFrame. The dataframe offers a lot of the easy manipulation of a database without having to actually use a database.","Q_Score":0,"Tags":"python,database,flask,architecture,web-development-server","A_Id":59521810,"CreationDate":"2019-12-29T17:34:00.000","Title":"Can I avoid using a database in this scenario?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Being new to django rest framework , I often get puzzled as what exactly is the use of viewset when we can overwrite crud methods in serializers too .Another thing is that how is overwriting crud methods in serializers different from overwriting crud  methods in viewsets ?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":57,"Q_Id":59523199,"Users Score":1,"Answer":"Technically, you can overwrite whatever you like wherever you like. The whole thing is just a convention.\nThe main idea is separation of concerns.\nWhen you overwrite your views it's for the purpose of pre-processing the incoming request.\nWhen you overwrite your serializers - it's because you want to change how the incoming data is serialized to be stored in your system (or how it is deserialized to be shown to the front-end).","Q_Score":0,"Tags":"python,django,django-rest-framework","A_Id":59528427,"CreationDate":"2019-12-29T20:55:00.000","Title":"use of viewsets in django rest framework","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using implicit library in python to implement a recommendation system. The model is ready, but the problem is my application is java based(spring boot). Now I've the model, matrices and everything setup in python. Basically the model has a offline component, where i perform the data feeding and matrix factorization stuff. After that I've a python method which returns the recommendation for a user. \nThe offline component will run once in a month. For the whole month I need to store the factorized matrix in some place and whenever required I need to call my python method from REST endpoint, which will utilize the stored matrix and return some results.\nSo I've two questions.\n1. My factorized matrix is a numpy.sparse_matrix. How can I store it, so that it will be reused again and again?\n2. How do i invoke a python method in java endpoint which will utilize the methods from implicit library then do the calculation based on the matrix and return the result?   \nAny insight would be appreciated. Thanks in advance.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":1206,"Q_Id":59534772,"Users Score":1,"Answer":"A recommended way would be to convert your Python code in a REST microservice and then use that in your Java program.","Q_Score":0,"Tags":"java,python,rest,spring-boot","A_Id":59534816,"CreationDate":"2019-12-30T17:41:00.000","Title":"How to call a python program from spring boot?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to upload files to Google Drive, but the < input type = \"file\"> tag does not exist in HTML. File selection window opens How can I select the file I want in this section?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":75,"Q_Id":59553820,"Users Score":0,"Answer":"Pyautogui like so,\nhover over your position You want to click\nget coordinates\nImport pyautogui\nPyautogui.position()\nUse those coordinates to click\nPyautogui.click(x,y)","Q_Score":1,"Tags":"python,selenium","A_Id":59554690,"CreationDate":"2020-01-01T15:43:00.000","Title":"How to upload selected file with Selenium in Python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am currently working on a Django project with around 30 models and there are lots of relations(For example, foreign key relations) between the models.\nMy doubt is \"After 6 months, let's say I want to add a new field(s) in one of the model\/table(s) in models.py, and make migrations, the new migration files will get created without affecting the initial migration files which were created 6 months ago.\"\nWill the relations be maintained after adding new columns in different tables? (or) do I have to go to pgadmin console and tweak them accordingly?\nOne way is to erase all the migrations and start fresh, but this is not recommended often especially if there is production data (or) there are frequent changes in the database schema.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":2209,"Q_Id":59553858,"Users Score":1,"Answer":"If you don't change Django version, adding new fields on models will not create any problem, even after many years. But, there are some situations this might create problems. For example, if Django is updated and you have installed the latest version.","Q_Score":1,"Tags":"django,python-3.x,foreign-keys,pgadmin-4,rdbms","A_Id":59554133,"CreationDate":"2020-01-01T15:48:00.000","Title":"Adding new field in Django model","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm beginner to django and got quite confused that what is the difference between register out models by admin.site.register and makemigrations in both cases we're mapping our tables to database, if i'm wrong kindly correct me.\nthank you","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":236,"Q_Id":59555442,"Users Score":1,"Answer":"They're not related at all.\nadmin.site.register(MyModel) just makes instances of that model editable via the admin page. Without it they won't appear on the admin.\nmakemigrations just auto-generates some Python files, inside the migrations directory of each app. These files are like a description, in Python code, of what changes you have made to your models. They do nothing in themselves, until you run migrate, which is the only command here which actually touches your database schema - it updates the schema so that it matches what's in your migration files.","Q_Score":0,"Tags":"python,django,interface,admin","A_Id":59555487,"CreationDate":"2020-01-01T19:24:00.000","Title":"Difference between admin.site.register and makemigrations in django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm beginner to django and got quite confused that what is the difference between register out models by admin.site.register and makemigrations in both cases we're mapping our tables to database, if i'm wrong kindly correct me.\nthank you","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":236,"Q_Id":59555442,"Users Score":0,"Answer":"admin.site.register : This line of code \"create\" an admin interface for you when excecuted. This interface is intended for admin users.\nmakemigrations : This is a command to \"manage\" the changes of your model\/database.","Q_Score":0,"Tags":"python,django,interface,admin","A_Id":59555599,"CreationDate":"2020-01-01T19:24:00.000","Title":"Difference between admin.site.register and makemigrations in django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am following the Obey the testing goat book and I try to automate some shell command server side using Fabric3\nI have an issue concerning thefab deploy:host=yyy@xxx\nyyy being username\nxxx being folder name of my domain name\nWhenever I run this command, I get Login password for 'xxx': and it just never seem to work even though I enter the correct one\nHere is what I did so far:\n1- did ssh-keygen locally and on the server\n2- added on local side a file named authorized_keys which contains id_rsa.pub generated on server side\n3- did the same operation on server side  \nBasically, both sides have a file named authorized_keys \nLocal side (resp. server side) have authorized_keys which is just a copy of id_rsa.pub generated by the ssh-keygen command on server side (resp. local side)\nCould anyone review what I did so far and tell me if I DID understand the problem (or not), and what should I do to resolve this issue\nThank vm","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":63,"Q_Id":59561008,"Users Score":0,"Answer":"I have no clue how I managed to make it work...\nBasically, I deleted the old public key that I had linked to my user in my digitalocean droplet's settings, and generated a new one, on the local terminal using ssh-keygen, then I did the basic configuration by copying this public key server-side on following path ~\/.ssh\/authorized_keys ...\nNow, it does still asks for my password, but does proceed to the execution of my fabfile script after correct password input\nI'm thinking that the 'proper' way to setup a ssh with one's user is to do it manually through command-line ?\nAnyway, problem 'solved'","Q_Score":0,"Tags":"python,django,server,automated-tests,fabric","A_Id":59592322,"CreationDate":"2020-01-02T09:30:00.000","Title":"fabric3 : Intempestive Login for password when trying to run fab command","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"we are training machine learning models offline and persist them in python pickle-files.\nWe were wondering about the best way to embedd those pickeled-models into a stream (e.g. sensorInputStream > PredictionJob > OutputStream.\nApache Flink ML seems to be the right choice to train a model with stream-data but not to reference an existing model. \nThanks for you response. \nKind Regards \nLomungo","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":825,"Q_Id":59563265,"Users Score":3,"Answer":"There are two possible solutions depending on the model You are using:\n\nPossibly the simples idea is to create external service that will call the model and return the results and then simply call the service with AsyncFunction\nUse some library, again depending on Your model to load the pre-trained model inside a ProcessFunction's open method. And then simply calling the model for each data that arrived. \n\nThe second solution has two disadvantages, first You need to have the Java version of the specific library available and the other is that You need to somehow externalize the metadata of the model if You want to be able to update it over time.","Q_Score":1,"Tags":"python,machine-learning,apache-flink,flinkml","A_Id":59563487,"CreationDate":"2020-01-02T12:21:00.000","Title":"Embedd existing ML model in apache flink","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Hi i am new in Python.\nI've tried running this on cmd \/ powershell : python app.py \nbut it doesn't do anything.\nSince i am using python 3 i also tried: python3 app.py but it came out as \n'python3' is not recognized as an internal or external command,\noperable program or batch file.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":97,"Q_Id":59572746,"Users Score":0,"Answer":"Add Python3 to your PATH.\nrun python3 -V\nIf it prints out the version.\nTest python3 app.py. Make sure you have installed required pip packages.\nelse\nsomething wrong with you python3 env\nIf nothing happens when test python3 app.py\ncheck you app.py","Q_Score":0,"Tags":"python","A_Id":59572825,"CreationDate":"2020-01-03T03:13:00.000","Title":"How do i run python flask and get the link of the localhost?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"If i defined a database schema where some field cannot contain a NULL field\nBut i enter a NULL value, would the validation occur on the database software?\nIf that database server where run on a different machine, would be sent through the network before receiving an error response?\nis this what the mean by Database validations and application validations?\nWhere application validations are enforced before data transmission?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":50,"Q_Id":59579050,"Users Score":0,"Answer":"Application validation validate input filed value before the migrate the data in database.\nIn database validation such as datatype length (these are also validate in application side)but some validate likeunique relationship with other data and some null value are validate on database side.\nEg. like Django application unique username name validate in model label(database) validate.\nrequired filed validate on form label or say application label validate","Q_Score":0,"Tags":"python,database","A_Id":59579216,"CreationDate":"2020-01-03T12:57:00.000","Title":"Difference between applcation and database validations","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"If i defined a database schema where some field cannot contain a NULL field\nBut i enter a NULL value, would the validation occur on the database software?\nIf that database server where run on a different machine, would be sent through the network before receiving an error response?\nis this what the mean by Database validations and application validations?\nWhere application validations are enforced before data transmission?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":50,"Q_Id":59579050,"Users Score":0,"Answer":"It is better to have the database ensure data integrity.  After all, your application layer is not be the only way to change data -- someone could run explicit INSERT and UPDATE statements within the database.\nIn addition, the optimizers in some databases can make use of NOT NULL constraints for query optimization.","Q_Score":0,"Tags":"python,database","A_Id":59579109,"CreationDate":"2020-01-03T12:57:00.000","Title":"Difference between applcation and database validations","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I just installed django and when I go to log onto the admin page the runserver stops running and the only error that pops up is ERR_CONNECTION_REFUSED. The virtual environment is active and running, and I can not find any answers online.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":60,"Q_Id":59595758,"Users Score":0,"Answer":"I had the same issue using Django 3.0.5\nWhat is your current python version? I had 3.7 and had to upgrade to 3.8 to be able to load the admin page. Had this issue before and downgrading to an older version of Django also works. Keep in mind if you upgrade the python version you will need to update your virtual env.","Q_Score":0,"Tags":"python,django,django-3.0","A_Id":61167451,"CreationDate":"2020-01-04T23:33:00.000","Title":"Can not connect to admin page on django 3.0.7","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I Have created a python based tool for my teammates, Where we group all the similar JIRA tickets and hence it becomes easier to pick the priority one first. But the problem is every time I make some changes I have to ask people to get the latest one from the Perforce server. So I am looking for a mechanism where whenever anyone uses the tool a pop up should come up as \"New version available\" please install.\nCan anyone help how to achieve that?","AnswerCount":3,"Available Count":3,"Score":0.1325487884,"is_accepted":false,"ViewCount":60,"Q_Id":59606906,"Users Score":2,"Answer":"I have an idea,you can use requests module to crawl your website(put the number of version in the page) and get the newest version.\nAnd then,get the version in the user's computer and compare to the official version.If different or lower than official version,Pop a window to remind user to update","Q_Score":3,"Tags":"python,python-3.x","A_Id":59606974,"CreationDate":"2020-01-06T05:04:00.000","Title":"I want my python tool to have a mechanism like whenever anyone runs the tool a pop up should come up as New version available please use the latest","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I Have created a python based tool for my teammates, Where we group all the similar JIRA tickets and hence it becomes easier to pick the priority one first. But the problem is every time I make some changes I have to ask people to get the latest one from the Perforce server. So I am looking for a mechanism where whenever anyone uses the tool a pop up should come up as \"New version available\" please install.\nCan anyone help how to achieve that?","AnswerCount":3,"Available Count":3,"Score":0.1325487884,"is_accepted":false,"ViewCount":60,"Q_Id":59606906,"Users Score":2,"Answer":"On startup, or periodically while running, you could have the tool query your Perforce server and check the latest version. If it doesn't match the version currently running, then you would show the popup, and maybe provide a download link.\nI'm not personally familiar with Perforce, but in Git for example you could check the hash of the most recent commit. You could even just include a file with a version number that you manually increment every time you push changes.","Q_Score":3,"Tags":"python,python-3.x","A_Id":59606944,"CreationDate":"2020-01-06T05:04:00.000","Title":"I want my python tool to have a mechanism like whenever anyone runs the tool a pop up should come up as New version available please use the latest","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I Have created a python based tool for my teammates, Where we group all the similar JIRA tickets and hence it becomes easier to pick the priority one first. But the problem is every time I make some changes I have to ask people to get the latest one from the Perforce server. So I am looking for a mechanism where whenever anyone uses the tool a pop up should come up as \"New version available\" please install.\nCan anyone help how to achieve that?","AnswerCount":3,"Available Count":3,"Score":0.0665680765,"is_accepted":false,"ViewCount":60,"Q_Id":59606906,"Users Score":1,"Answer":"You could maintain the latest version code\/tool on your server and have your tool check it periodically against its own version code. If the version code is higher on the server, then your tool needs to be updated and you can tell the user accordingly or raise appropriate pop-up recommending for an update.","Q_Score":3,"Tags":"python,python-3.x","A_Id":59607089,"CreationDate":"2020-01-06T05:04:00.000","Title":"I want my python tool to have a mechanism like whenever anyone runs the tool a pop up should come up as New version available please use the latest","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am in the process of moving a site created in django to another server. I have packed all files into a zip package, created a new virtualenv environment on a second server, and dumpdate into a .json file. I already have all the files on the destination server, but unfortunately I don't know what to do next. \nHow to run django in the new virtualenv environment? Should I extract the files to a folder with the new virtualenv? If so, do I have to activate virtualenv first?\nI will also add that migration takes place from two different systems. From windows on ubuntu.","AnswerCount":1,"Available Count":1,"Score":0.6640367703,"is_accepted":false,"ViewCount":959,"Q_Id":59616382,"Users Score":4,"Answer":"Save your env packages to a file with a command pip freeze > requirements.txt. \nAfterwards on your new server create virtualenv and install all packages with command pip install -r requirements.txt.\n\nDo not copy your virtualenv manually, packages might work differently on another system.\nactivate your virtualenv and run python -m django \u2014version to check that Django is installed correctly. \n\nCopy your code repository anywhere you like.\nThen create your database (empty database) if it\u2019s not SQLite.  cd into your project folder. Run python manage.py migrate to create the tables of your database. \nRun python manage.py loaddata dbdump.data to migrate all the data of your db. dbdump.data is the file created on the old system with python manage.py dumpdata. Note: if the previous project contained data migrations, loaddata will fail because the db will already contain data. In that case you\u2019ll need to manually delete all data in the database first using raw sql. \nIf you had uploaded files on your previous system, copy these files into the MEDIA_ROOT folder (create it if necessary). Check for MEDIA_ROOT in settings.py\nRun python manage.py collectstatic\n\nNow run manage.py runserver and check everything works: curl -v http:\/\/127.0.0.1:8000 will show you your project's response.","Q_Score":0,"Tags":"python,django,server,virtualenv","A_Id":59616453,"CreationDate":"2020-01-06T17:23:00.000","Title":"How to run django files in another virtualenv environment on another server?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am moving the django page from the windows server to the ubuntu server. I get a utf8 error while executing the python manage.py loaddata command. Unfortunately, I don't know why. Below I send the message I receive.\n'utf8' codec can't decode byte 0xff in position 0: invalid start byte\nI will add that the site uses the MySQL database.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":29,"Q_Id":59631971,"Users Score":0,"Answer":"I solved the problem by changing the encoding in the file I imported from. I did this using the notepad ++ code editor.","Q_Score":0,"Tags":"python,django,linux,windows","A_Id":59632406,"CreationDate":"2020-01-07T16:05:00.000","Title":"How to import django data from windows on ubuntu correctly?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm tasked with creating a web app (I think?) for my job that will tracker something in our system. It'll be an internal tool that staff uses to keep track of the status of one of the things we do. It should look like trello, with cards that drag from step to step. That frontend exists, but my job is to make the system update when the cards are dragged. This requires using an API in Python and isn't that complicated to grab from\/update. I have no idea how to put all of this together. My job is almost completely nontechnical and there's no one internally who knows what I'm doing except for me. I'm in so over my head here and have no idea where to begin. Is this something I should deploy on Elastic Beanstalk? EC2? How do I tie this together and put it somewhere?","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":75,"Q_Id":59636606,"Users Score":0,"Answer":"Are you trying to pull in live data from Trello or from your companies own internal project management tool?\nAn EC2 might be useful, but honestly, it may be completely unnecessary if your company has its own servers. An EC2 is basically just a collection of rental computers to help with scaling. I have never used beanstalk so my input would be useless there. \nFrom what I can assume from the question, you could have a python script running to pull from the API and make the changes without an EC2.","Q_Score":1,"Tags":"python,amazon-web-services,deployment,web-applications","A_Id":59637887,"CreationDate":"2020-01-07T21:54:00.000","Title":"How do I deploy this app for my job: EC2, Elastic Beanstalk, something else entirely?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm building my first ever web-app in python, haven't even decided on a framework yet,\ndoes it make sense to start out with a MySQL database to manage users and credentials?\nor is it a completely ridiculous way to approach it?\nwhat are some existing solutions and best practices for managing user credentials?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":133,"Q_Id":59637029,"Users Score":2,"Answer":"The answer is, as always, it depends. There are many ways to build a web app in Python so you'll first need to decide on what you want to build or what technology you want to learn. \nIf you just want to focus on a Python backend as a learning exercise then you could use Flask which can run as a server and includes many modules to help you get started including managing users. If you plan to expose your app publicly though it is generally recommended to use Apache or some other battle tested server which can route the requests to Flask.\nThere are other Python frameworks like bottle which I believe is meant to be even simpler than Flask and Django which is more complicated but has more features. It all depends on what you want to do. You can also look at things like dash if you're end goal has a data analysis flavor.\nOne thing to note though is that managing user credentials is not trivial. It can be a useful exercise if you like to learn and tinker, but to do it correctly youll need to learn about salting passwords, cryptographically secure hashing, session management, https (and ideally which ciphers should be deprecated), how to protect against sql injection (good to know how to do this anyway if you don't already), cross site scripting, CORS, etc. The list goes on. None of these things are exclusively just for managing user credentials but you should understand all the ways things can go south on you.","Q_Score":0,"Tags":"python,mysql,security,authentication","A_Id":59637223,"CreationDate":"2020-01-07T22:32:00.000","Title":"Managing User Authentication for a web-app with MySQL","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm new to python and working on a small code for flask webserver.\nI need a solution to achieve the below scenario.\nI have app.py which calls settings.py for flask user ID and password and also a route.py to handble the routes.\nNow I want users to be asked for authentication only for few routes and other routes should override authentication and perform operation based on specific users\/specific host.\nCan this be achieved?\nAs of now its asking for authentication for all the routes","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":413,"Q_Id":59646762,"Users Score":0,"Answer":"Although the above answer solves my query, I was looking for more specific scenario.\nHere's what I changed,\nI commented #app.config['BASIC_AUTH_FORCE'] = True in flask settings\nHere is what changed in routes.py\nAdded \nbasic_auth = BasicAuth(app)\nand I added this decorator\n@basic_auth.required for the routes which requires authentication.\nAs a security measure, I am allowing Unauthenticated requests only from a specific host using headers.","Q_Score":0,"Tags":"python,authentication,flask,overriding","A_Id":60638040,"CreationDate":"2020-01-08T13:19:00.000","Title":"Flask Authentication Override for one Route","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to find all tags that are either <h1> OR <div class='abc'>. I tried bs.find_all(['h1', 'div'], attrs={'class': 'abc'}), but this will ignore the <h1> tags: apparently, the attrs argument applies an AND condition to the search (meaning the tag must belong to the list of tag name AND have the given attribute, which the <h1> tags do not meet).\nCan anyone suggest a fix to this? Thank you.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":64,"Q_Id":59658164,"Users Score":0,"Answer":"How about concatenate two results like bs.find_all('h1') + bs.find_all(['div', attrs={'class': 'abc'}) ?","Q_Score":1,"Tags":"python,beautifulsoup","A_Id":59658323,"CreationDate":"2020-01-09T06:14:00.000","Title":"BeautifulSoup: Find any tag that matches one tag by name, or another tag by attribute","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Holoviews to construct a dashboard of charts. Some of these charts have percentages in the y axis where as others have sums\/counts etc. When I try to output all the charts I have created to a html file, all the charts change their y axis to match the axis of the first chart of my chart list. \nFor example:\n\nChart 1 is a sum, values go from 0 to 1000\nChart 2 is a %\nChart 3 is a %\n\nwhen I combine these charts in holoviews using:\n\nCharts = Chart 1 + Chart 2 + Chart 3\n\nThe y axis of charts 2 and 3 become the same as chart 1.\nDoes anyone know why this is happening and how I can fix it so all the charts keep their individual axis pertinent to what they are trying to represent. \nThank you!","AnswerCount":3,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":1953,"Q_Id":59661074,"Users Score":3,"Answer":"Sander's response is correct and will solve your specific problem, but in this case it may not be addressing the root cause. HoloViews only links axes that are the same, and it sounds like you're plotting different quantities on the y axis in each plot. In that case, the real fix is to put in a real name for the y axis of each plot, something that distinguishes it from other things that you might want to plot on the y axis in some other plot you're showing. Then not only will HoloViews no longer link the axes inappropriately, the viewer of your plot will be able to tell that each plot is showing different things.","Q_Score":8,"Tags":"python,holoviews,holoviz","A_Id":59674053,"CreationDate":"2020-01-09T09:41:00.000","Title":"Holoviews charts sharing axis when combined and outputted","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using django transactions to work with my DB. The thing I am stuck on is that I have a DB and I want to replace the whole DB table with a new one created in the transaction block. The behavior of @transaction.atomic is that it will always update the DB table. So the old table entries will stay there. How to always remove the old entries? Am I missing something in the Django specs? Or do I need to clear the db table manually inside the transaction block?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":108,"Q_Id":59666373,"Users Score":0,"Answer":"Resolved - I deleted the table records in the transaction block.\nIt was a bug in the code.\nThanks for helpful comments","Q_Score":0,"Tags":"python,django,database,transactions","A_Id":59667284,"CreationDate":"2020-01-09T14:40:00.000","Title":"Python Django db transaction uses update","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a python code on a server and if I upload a video from mobile to the server,so How can I provide path of that video to the python code if I want every video should prodceed by the python code","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":141,"Q_Id":59671070,"Users Score":0,"Answer":"I have doubts that your explanation has truly reflects what you need. First of all servers accept every thing \"as it is\" as long as the input has the appropriate format for that specific \"server\". In your case, the video might be a stream, binary, or event encoded data in to a \"socket\" in your \"server\". the framework should not matter. So when you have a stream you should be able get it in to your \"server\" to be processed. If you have problem in that sense, you should try to look first how \"servers\" accept input. I assume you're knowledgable for that. Let's say you have a nginx server on a linux machine which also has a python included. So your web server should be configured to run in python (Django or something similar). Once you started to upload your file, the content can be passed as async, or sync process in python (I think I should not mention how RESTFull model work on http). When you have the data (stream or static\/bulk), you should be able to whatever you want to do with that data.","Q_Score":0,"Tags":"python,video,uploading","A_Id":59725643,"CreationDate":"2020-01-09T19:42:00.000","Title":"Uploaded video process by python code on server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using an HTML5 audio player to play audio content in a python\/flask web application. I can display the current time and duration just fine on my web page, but now I want to get the current time of playback when a submit button is clicked. I also want to get the duration of the audio file.\nHow do I get these two pieces of information into Python? Do I need to pass it into a form (e.g., DecimalField from WTForms)? Is it a task for Beautiful Soup? I'm not quite sure what to do. I have reviewed many other questions, but they all seem to be about displaying the data, not passing it into Python so it can be manipulated.\nFWIW, I am using Python, Flask, SQLAlchemy, HTML....\nThanks in advance!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":87,"Q_Id":59700594,"Users Score":0,"Answer":"I solved this issue. What I did was use javascript to obtain the currentTime of the html audio file upon click of a button and pass the value to a hidden html input field on a flask form. Then on another button click I submit the value to Python. I'm sure this solution is specific to my application, but I'm happy to answer questions if others have trouble.","Q_Score":1,"Tags":"python,html,flask,web-applications,html5-audio","A_Id":59736076,"CreationDate":"2020-01-12T03:05:00.000","Title":"Getting HTML5 audio \"currentTime\" and \"duration\" into Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am not able to display the charts on jupyter notebook. The same code displays on chrome in one laptop but does not work on chrome on other laptop. \nI do not see any error or even a empty plot when I execute the code but get alt.Chart(...) in the output.\nThe version of altair and vega etc are same on both the laptops.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":2841,"Q_Id":59705914,"Users Score":1,"Answer":"For 'altair' version of '4.1.0',\n'vega' version of '3.4.0'\njust do alt.renderers.enable('default') instead of\nalt.renderers.enable('notebook')","Q_Score":1,"Tags":"python,jupyter-notebook,altair","A_Id":63711303,"CreationDate":"2020-01-12T16:35:00.000","Title":"Not able to display altair charts in jupyter notebook","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm getting server error(500) after I set DEBUG to False, both in local and after deploying to Heroku.\nEverything is Ok when DEBUG mode is True.\nThanks for help","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":65,"Q_Id":59706099,"Users Score":0,"Answer":"Thanks for the answers, I have found the solution, the issue was with html template {% static %} tag.\nI had such line \n\nlink rel=\"shortcut icon\" href=\"{% static 'assets\/images\/39-1109688-140x140.png' type=\"image\/x-icon' %}\"\n\nbut the closing %} must be in front of type\n\nlink rel=\"shortcut icon\" href=\"{% static 'assets\/images\/39-1109688-140x140.png' %}\" type=\"image\/x-icon\"","Q_Score":0,"Tags":"python,django","A_Id":59707130,"CreationDate":"2020-01-12T16:57:00.000","Title":"Django DEBUG=False getting server 500 error","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've got 2 Python 3.6 pods currently running. They both used to run collectstatic upon redeployment, but then one wasn't working properly, so I deleted it and made a new 3.6 pod. Everything is working perfectly with it, except it no longer is running collectstatic on redeployment (so I'm doing it manually). Any thoughts on how I can get it running again? \nI checked the documentation, and for the 3.11 version of openshift still looks like it has a variable to disable collectstatic (which i haven't done), but the 4.* versions don't seem to have it. Don't know if that has anything to do with it. \nEdit: \nSo it turns out that I had also updated the django version to 2.2.7. \nAs it happens, the openshift infrastructure on openshift online is happy to collectstatic w\/ version 2.1.15 of Django, but not 2.2.7 (or 2.2.9). I'm not quite sure why that is yet. Still looking in to it.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":43,"Q_Id":59708655,"Users Score":0,"Answer":"Currently Openshift Online's python 3.6 module doesn't support Django 2.2.7 or 2.2.9.","Q_Score":0,"Tags":"django,openshift,python-3.6,openshift-3","A_Id":59978553,"CreationDate":"2020-01-12T22:30:00.000","Title":"Openshift online - no longer running collectstatic","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"my project run local on pycharm without error but when i deployed it on heroku\n error message appears :Importing the multiarray numpy extension module failed.\n i changed numpy version more than one but it does not work\nDjango Version:     2.2.5\nException Type:     ImportError\nException Value: Importing the multiarray numpy extension module failed.  Most\nlikely you are trying to import a failed build of numpy.\nIf you're working with a numpy git repo, try git clean -xdf (removes all\nfiles not under version control).  Otherwise reinstall numpy.\nOriginal error was: libpython3.6m.so.1.0: cannot open shared object file: No such file or directory\nException Location:     \/app\/.heroku\/python\/lib\/python3.6\/site-packages\/numpy\/core\/init.py in , line 26\nPython Executable:  \/app\/.heroku\/python\/bin\/python\nPython Version:     3.6.10\nnumpy version : 1.18.1\nany solution?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":322,"Q_Id":59709490,"Users Score":0,"Answer":"i solve it \nmy solution was\nRun locally   1- python -m pip install python-dev-tools\nthen  2- pip freeze > requirements.txt\n3-git add .\n4-git commit -m \"v5\"\n5- heroku git:remote -a \"your appname on heroku\"\n6-git push heroku master","Q_Score":0,"Tags":"python,numpy,heroku","A_Id":59742768,"CreationDate":"2020-01-13T00:59:00.000","Title":"Importing the multiarray numpy extension module failed. Most likely you are trying to import a failed build of numpy","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Recently I took over Django project whose one component is Scrapy scrapprs (a lot of - core functionality). It is worth adding that scrapers simply feed the database several times a day and django web app is using this data.\n__Scraper__s have direct access to Django model, but in my opinion is not the best idea (mixed responsibilities - django rather should act as a web app, not also scrapers, isn't it?). For example after such split scrapers could be run serverless, saving money and being spawned only when needed.\nI see it at least as separate component in the architecture. But if I would separate scrapers from Django website then I would need to populate DB there as well - and change in model either in Django webapp or in scraping app would require change in second app to adjust.\nI haven't seen really articles about splitting those apps.\nWhat are the best practices here? Is it worth splitting it? How would you organise deployment to cloud solution(e.g. AWS)?\nThank you","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":210,"Q_Id":59719318,"Users Score":1,"Answer":"Well, this is a big discussion and I have the same \"good problem\".\nShort answer: \nI suggest you that if you want to separate it, you can separate the logic from the data using different schemes. I did it before and is a good approach.\nLong answer:\nThe questions are: \n\nOnce you gather information from scrapers, are you doing something with them (Aggregation, treatment, or anything else)? \n\nIf the answer is yes, you can separate it in 2 DB. One with the raw information and the other with the treated one (which will be the shared with Django).\nIf the answer is no, I don't see any reason to separate it. At the end, Django is only the visualizer of the data.\n\nThe Django website is using a lot of stored data that for the Single Responsibility you want to separate it from the scraped data?\n\nIf the answer is yes, separate it by schemas or even DB.\nIf the answer is no, you can store it in the same DB of Django. At the end, the important data will be the extracted data. Django maybe will have a configuration's DB or other extra data to manage the web, but the big percentage of the DB will be the data crawled\/treated. Depends how much cost it will take you to separate it and maintain. If you are doing from the beginning, I would do it separately.","Q_Score":1,"Tags":"python,django,web-scraping,architecture,scrapy","A_Id":59731276,"CreationDate":"2020-01-13T15:15:00.000","Title":"Django + Scrapy multi scrapers architecture","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to create a website in Node.js. Though, as I am taking a course on how to use Artificial Intelligence and would like to implement such into my program. Therefore, I was wondering if it was feasible to connect Python Spyder to a Node.js based web application with somewhat ease.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":1193,"Q_Id":59738972,"Users Score":1,"Answer":"Yes. That is possible. There are a few ways you can do this. You can use the child_process library, as mentioned above. Or, you can have a Python API that takes care of the AI stuff, which your Node app communicates with. \nThe latter example is what I prefer as most my projects run on containers as micro services on Kubernates.","Q_Score":1,"Tags":"python,node.js,artificial-intelligence,spyder","A_Id":59740436,"CreationDate":"2020-01-14T17:32:00.000","Title":"Can I use Node.js for the back end and Python for the AI calculations?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have built a rest API using Django. I have tested the endpoints and everything seems to be working fine on localhost.However after deploying to digital ocean and trying to access the endpoint to register a new user. I get Error 401. What could be the problem?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":151,"Q_Id":59750798,"Users Score":0,"Answer":"Might be a long shot, but I've had similar issues happen to me if I used HTTP when calling the URLs instead of HTTPS and\/or forgetting to call routes with the slash at the end. What would end up happening is that the request would drop the token data for some reason.","Q_Score":0,"Tags":"python,django,django-rest-framework","A_Id":59758733,"CreationDate":"2020-01-15T11:47:00.000","Title":"Error 401 when trying to register a new user. Works fine on localhost (Django rest api)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have to automate certain tests daily using cron job. I specify my shell script in my cron job. First, I have to first start my spring-boot application. I do that using the java -jar spring-boot-app.jar command. Then I need to execute a python script after starting the spring-boot app. I've put both these 2 commands in a shell script. But the problem is the python script is not being run, after starting the spring-boot app from the shell script. How do I start the python script too? I tried opening a new terminal using gnome-terminal in my script, but this command doesn't work in a remote machine. How do I start both the spring-boot app and the python command?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":357,"Q_Id":59763543,"Users Score":1,"Answer":"I think the answer above by UtLox will resolve your problem, because the \"&\" at the end will run your Spring Boot application in the background","Q_Score":1,"Tags":"java,python,shell,cron","A_Id":59763697,"CreationDate":"2020-01-16T05:32:00.000","Title":"how to run both java and python command in a shell script","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a use case where I need to poll the API every 1 sec (basically infinite while loop). The polling will be initiated dynamically by user through an external system. This means there can be multiple polling running at the same time. The polling will be completed when the API returns 400. Anyways, my current implementation looks something like:\n\nFlask APP deployed on heroku.\nFlask APP has an endpoint which external system calls to start polling.\nThat flask endpoint will add the message to queue and as soon as worker gets it, it will start polling. I am using Heroku Redis to Go addons. Under the hood it uses python-rq and redis. \n\nThe problem is when some polling process goes on for a long time, the other process just sits on the queue. I want to be able to do all of the polling in a concurrent process.\nWhat's the best approach to tackle this problem? Fire up multiple workers?\nWhat if there could be potentially more than 100 concurrent processes.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":242,"Q_Id":59781138,"Users Score":0,"Answer":"You could implement a \"weighted\"\/priority queue. There may be multiple ways of implementing this, but the simplest example that comes to my mind is using a min or max heap.\nYou shoud keep track of how many events are in the queue for each process, as the number of events for one process grows, the weight of the new inserted events should decrease. Everytime an event is processed, you start processing the following one with the greatest weight. \nPS More workers will also speed up the the work.","Q_Score":3,"Tags":"python,heroku,flask,worker,python-rq","A_Id":59791745,"CreationDate":"2020-01-17T04:19:00.000","Title":"Best approach to tackle long polling in server side","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am building a Flask project. My \"templates\" folder is a subdirectory of \"app\" folder. The code starts in styleprive.py which is in app with the line \"From app import app\". This triggers init.py inside app.\nWhen I run:\nos.path.abspath(app.template_folder)\nThe result is surprising I think: \/Users\/egarcialopez\/local_programming\/styleprive\/templates\nand not \/Users\/egarcialopez\/local_programming\/styleprive\/app\/templates\nWhy does app not show up?\nThank you","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":65,"Q_Id":59785126,"Users Score":0,"Answer":"I think you should use os.path.abspath(\"app\/template_folder\")","Q_Score":0,"Tags":"python,flask","A_Id":59785230,"CreationDate":"2020-01-17T10:04:00.000","Title":"Abspath for templates folder in Flask is surprising?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a django project and external resource. The external resource has XML data which changes time to time but it still static if nothing happened. I need to collect new data if something happened.\nThe ways I see:\n1. Grab content one time in some period and check if it is different.\n2. Save content as file and check length (worse way).\nUnfortunately, I can't predict when content will change also I can't use WebSockets, Long Polling and WebHooks.\nPlease, describe me the ways that in modern WWW today may solve my problem!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":18,"Q_Id":59791391,"Users Score":0,"Answer":"If you can add some hook, when external resource updated, you can use it.\nBut if it is impossible - on way to do it is create periodical task for checking external resources (Last-Modified header for example).","Q_Score":0,"Tags":"django,python-3.x,http,https","A_Id":59791479,"CreationDate":"2020-01-17T16:32:00.000","Title":"Whats the best way to add listener to external resource?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have been unable to create django project via command prompt. Here is the path I set in the environment variable: C:\\Users\\Freddy\\AppData\\Local\\Programs\\Python\\Python38-32\\Scripts;C:\\Users\\Freddy\\AppData\\Roaming\\Python\\Python38\\site-packages\\django. I tried to run this \"django-admin\" in command prompt I got this message that \"\ndjango-admin is not recognized as an internal or external command,operable program or batch file\" What do I do?","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":223,"Q_Id":59791628,"Users Score":1,"Answer":"I installed it using pip \"pip install django\" and it was successfully installed.Also I was able to check the version in the python shell. Here is the path it was automatically installed \"AppData\\Roaming\\Python\\Python38\\site-packages\\django\"C:\\Users\\Freddy\\AppData\\Roaming\\Python\\Python38\\site-packages\\django\\bin\nanother folder which contains django-admin \"C:\\Users\\Freddy\\AppData\\Roaming\\Python\\Python38\\Scripts\"","Q_Score":1,"Tags":"python,django","A_Id":59791880,"CreationDate":"2020-01-17T16:47:00.000","Title":"How to create django project in cmd","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have been unable to create django project via command prompt. Here is the path I set in the environment variable: C:\\Users\\Freddy\\AppData\\Local\\Programs\\Python\\Python38-32\\Scripts;C:\\Users\\Freddy\\AppData\\Roaming\\Python\\Python38\\site-packages\\django. I tried to run this \"django-admin\" in command prompt I got this message that \"\ndjango-admin is not recognized as an internal or external command,operable program or batch file\" What do I do?","AnswerCount":2,"Available Count":2,"Score":0.1973753202,"is_accepted":false,"ViewCount":223,"Q_Id":59791628,"Users Score":2,"Answer":"As error is clearly saying that django-admin not installed to install it you can you pip.\nYou can use following command for window\n\npy -m pip install virtualenvwrapper-win\nmkvirtualenv myproject\nworkon myproject\npy -m pip install Django","Q_Score":1,"Tags":"python,django","A_Id":59792052,"CreationDate":"2020-01-17T16:47:00.000","Title":"How to create django project in cmd","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am building a python script that is trying to stream a screen capture to my Facebook Page and to be able to retrieve all the comments from the Facebook Live stream real time so that I can do some processing in the middle of the stream.\nThe Facebook App was set up (in development mode) but when I tried to retrieve the comments from my live stream, I am only able to retrieve comments with their name and id (\"from\") that are made as the Facebook Page Admin, not comments that are made by other users. I need the user's id, user's name and their comments.\nI understand that I need to get Facebook App to be live mode in order to retrieve all the comments with their details tagged to it. When I tried to get it, it tells me that I need to get the permission approved. I tried to fill in most of the stuff and try to get the two permission (manage_page for the comments and live video API for the streaming) but I was unable to because I left the platform empty.\nBelow is the message I got:\n\nYou do not have any platforms eligible for review. Please configure a platform on your Settings page.\n\nThe problem is when I tried to choose a platform that was shown in the list, python script does not fall in the list of platform. \nDoes anyone know of a solution or a different way to achieve what I need to retrieve?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1082,"Q_Id":59810273,"Users Score":0,"Answer":"In order to get the \"from\" field when retrieving the comments, you need to have manage_pages permission from your Facebook App that is linked to your Facebook Page. You will need to submit an App review for your Facebook App that usually takes 1-3 days to process. If you are lucky, it will probably take about 6-8 hours. \nOnce it is approved, you can request the permission and get your application to go live.\nAlso use the Page Access token in your \"access_token\" field when invoking the API so that it will allow you to pull the \"from\" field, which contains the id and name of the user.","Q_Score":5,"Tags":"python,facebook,facebook-graph-api","A_Id":61137300,"CreationDate":"2020-01-19T13:05:00.000","Title":"Retrieving Facebook Page comments with python script","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a task in which in have to create view.py, template, url.py and model.py in django, In which I have four Button D1, D2, D3, D4 in template.\nWhen I click on D1 it should redirect me to a page whose link is:\nhttp:\/\/127.0.0.1:8000\/uploads\/test\/**D1**\nAnd while clicking on D2 link redirects me one same page and link is http:\/\/127.0.0.1:8000\/uploads\/test\/**D2**\nSimilarly while clicking on D2 and D3 links are\nhttp:\/\/127.0.0.1:8000\/uploads\/test\/**D3** and http:\/\/127.0.0.1:8000\/uploads\/test\/**D4**","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":105,"Q_Id":59821470,"Users Score":2,"Answer":"You can pass parameters in Django URLs like this\npath('test\/<int:post_id>',views.index, name='index'),\nHere post_id is the parameter you can use yours.\n<int:> is for integers and <str:> is for strings","Q_Score":0,"Tags":"python,django,django-views","A_Id":59821836,"CreationDate":"2020-01-20T10:37:00.000","Title":"How to pass parameter in url?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to Robot Framework. I came across a scenario where i just want to create Employee details and not assert, is there a way in Robot framework where i can run a file which has KeyWords section and not TestCases and still execute the operation?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":152,"Q_Id":59841252,"Users Score":0,"Answer":"No, you can\u2019t execute keyword without testcase.","Q_Score":2,"Tags":"python,robotframework","A_Id":59841374,"CreationDate":"2020-01-21T12:32:00.000","Title":"How to run Keywords directly instead of TestCases In robot Framework","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So, as part of an assignment, I am doing player suggestions for NBA draft picks using clustering algorithm. The clustering algorithm is made in python and I want to show the result in the form of a user interface HTML web page. Is it possible to display the python output in an HTML web page.\nIn other words, the python code should run in the background of the HTML web page.\nJust a note: I am not wanting to just import the matplotlib animations, but the whole algorithm from Python to HTML web  page such that when the user interacts with the interface the python algorithm must work in the background of the web page.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":98,"Q_Id":59844683,"Users Score":0,"Answer":"Assuming you are using matplotlib to display the results of the clustering algorithm, I would suggest googling the \"mpld3\" package. It is easy to use, and the results generated by mpld3's convenience routines can be embedded on a web page. If you choose to try mpld3 out, I think the routine you want to try is fig_to_html(). Follow the instructions on the official website and the \"Quick Start Guide\" for more detail!","Q_Score":0,"Tags":"javascript,python,html,user-interface","A_Id":59844806,"CreationDate":"2020-01-21T15:49:00.000","Title":"Displaying Python Machine Learning Algorithm as HTML Web page","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I wanted to handle browser support. If the browser does not support the website, I would like to be redirected to a custom template. How do I find out if the browser supports it or not\ncan anyone help me.?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":53,"Q_Id":59856669,"Users Score":1,"Answer":"The information about what the browser claims itself to be is available in request.META['HTTP_USER_AGENT'], which you can use to redirect to an error screen \"We do not support Internet Exploiter 5\" or whatever. Or, to conditionalize your template rendering for Edge cases (sorry MS, couldn't resist). \nYou can of course also write  more-or-less concealed Javascripts to test that the browser correctly handles some feature that you  absolutely require (for example, that JavaScript is not disabled, that cookies are accepted ... )","Q_Score":0,"Tags":"python,django,python-3.x,django-2.2","A_Id":59858084,"CreationDate":"2020-01-22T09:43:00.000","Title":"Django Error Handling for Browser Support","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"With Django 1.8 I used Django-celery to run asynchronous tasks and I was able to debug them in my IDE (either PyCharm or Eclipse+PyDev) just launching \"python celery worker\" in debug mode.\nDjango-celery doesn't support Django 2.2, so I have to run pure celery.exe.\nCelery docs say that I have to add pdb to my code and run debug via console.\nHow can I debug these tasks as I did before, adding breakpoints dynamically from my IDE?","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":558,"Q_Id":59863762,"Users Score":0,"Answer":"Telnet solution doesn't work for me.\nBut I was able to debug my tasks with pdb.\nAdd breakpoint: pdb.set_trace().\nThen just run worker with -l warning, it will prevent printing of excessive info.","Q_Score":1,"Tags":"python,django,celery,django-celery,pdb","A_Id":72050714,"CreationDate":"2020-01-22T16:03:00.000","Title":"Celery + Django on Windows: debugging asynchronous tasks","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"With Django 1.8 I used Django-celery to run asynchronous tasks and I was able to debug them in my IDE (either PyCharm or Eclipse+PyDev) just launching \"python celery worker\" in debug mode.\nDjango-celery doesn't support Django 2.2, so I have to run pure celery.exe.\nCelery docs say that I have to add pdb to my code and run debug via console.\nHow can I debug these tasks as I did before, adding breakpoints dynamically from my IDE?","AnswerCount":3,"Available Count":2,"Score":0.1973753202,"is_accepted":false,"ViewCount":558,"Q_Id":59863762,"Users Score":3,"Answer":"You can use CELERY_ALWAYS_EAGER = True setting in you development env. If this is True, all tasks will be executed locally without sending it to a queue.","Q_Score":1,"Tags":"python,django,celery,django-celery,pdb","A_Id":59863960,"CreationDate":"2020-01-22T16:03:00.000","Title":"Celery + Django on Windows: debugging asynchronous tasks","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a web page with data in different tables. I want to extract a particular table and compare with an excel sheet and see whether there are any differences. Note the web page is in a internal domain. I tried with requests and beautifulsoup but I got 401 error. Could anyone help how I can achieve this?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":112,"Q_Id":59871748,"Users Score":0,"Answer":"401 is an Unauthorized Error - which suggests your username and password may be getting rejected, or their format not accepted. Review your credentials and the exact format \/ data names expected by the page to ensure you're correctly trying to connect.","Q_Score":1,"Tags":"python,web-scraping,beautifulsoup","A_Id":59872815,"CreationDate":"2020-01-23T04:51:00.000","Title":"Scrape and compare and Web page data","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have started learning Django.I am following a tutorial series. Here after some tutorials they started class-based views.Should I give more focus on Function-based view or Class-based view for better learning.Thank you.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":44,"Q_Id":59872893,"Users Score":1,"Answer":"There was a period that function based programming was only there. They were made to address the basic use cases. However, the issue was that they were very basic, and was difficult to expand or customize them (other than utilizing arrangements parameters).\nTo address those issues, the class-based views was created.","Q_Score":0,"Tags":"python,django","A_Id":59873068,"CreationDate":"2020-01-23T06:42:00.000","Title":"Django Learning","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Why does Gunicorn send info message Handling signal: winch when application is idle?\nThere is no error, as the application continues to respond, but when it is idle, the above message is displayed.\nI could not find more information in Gunicorn handling signal documentation section except\nWINCH: Gracefully shutdown the worker processes when Gunicorn is daemonized.\n\nWhat is the meaning here, Gunicorn daemonized?\nHandling signal: winch info when idle, does one need to take some action for this?\nAny brief info on WINCH and all other signal meanings?","AnswerCount":1,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":8094,"Q_Id":59884188,"Users Score":23,"Answer":"A winch signal (or SIGWINCH, short for Signal Window Change) is normally sent to applications when the terminal window size changes, so that applications know to redraw on the screen. However, gunicorn interprets it to shutdown the worker processes, but only when the application is daemonized. Daemonized is just another way of saying an application is running in the background. This means that while gunicorn isn't running as a background process (i.e. it's on your screen), it handles the signal and doesn't shut down the worker processes.\nSo to answer your questions:\n\nDaemonized means an application is running in the background.\nYou don't have to take any action at all, when gunicorn is running in the background it won't be getting any Winch signals, so you don't have to worry about it shutting down.\nWinch is normally sent when a terminal window is resized (you can see this by resizing your terminal window while gunicorn is visible, you'll see a lot of handling signal messages).","Q_Score":25,"Tags":"python,gunicorn,uwsgi","A_Id":64144036,"CreationDate":"2020-01-23T17:30:00.000","Title":"Gunicorn sends info message Handling signal: winch","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"A virtual environment is required when creating an application and now I am using 'virtualenv' for creating a virtual environment while developing my Django application. I heard of Docker about its virtual environment. Am I able to use Docker as an alternative to virtualenv?","AnswerCount":4,"Available Count":2,"Score":0.049958375,"is_accepted":false,"ViewCount":1262,"Q_Id":59907326,"Users Score":1,"Answer":"Yes docker can be used as an alternative.\nvirtualenv just sets a fresh python installation in path which can be used to install dependencies particular to your project without polluting global python installation and thus managing versioning as well.\nDocker is a step further and gives a complete OS - linux image and OS level isolation. Not just one can have a isolated python installation but can also have other os specific dependencies installed like ffmpeg, lapack, arpack etc. A new developer can spin up a container from docker image having all dependencies (python and OS) installed.","Q_Score":2,"Tags":"python,django,docker,containers,virtualenv","A_Id":59907376,"CreationDate":"2020-01-25T07:47:00.000","Title":"Is Docker an alternative for 'virtualenv' while develping Django project?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"A virtual environment is required when creating an application and now I am using 'virtualenv' for creating a virtual environment while developing my Django application. I heard of Docker about its virtual environment. Am I able to use Docker as an alternative to virtualenv?","AnswerCount":4,"Available Count":2,"Score":0.049958375,"is_accepted":false,"ViewCount":1262,"Q_Id":59907326,"Users Score":1,"Answer":"The usage of virtualenv or docker depends on your requirement or use case.\nDocker container encapsulates an entire OS and provides isolation of OS whereas a virtualenv only encapsulates Python dependencies which enables switching between Python versions and dependencies, but you are dependent with your host OS. \nVirtualenv can be used in case if you have two different projects on your machine that require two different versions of the same package with python. Typically, the virtualenv provides abstraction from OS's use of python. \nDocker enables portability from one machine to another whereas with virtualenv you will have to do the installation in another place.  Docker isolates all of the additional system dependencies too and provides a completely isolated environment.  It is containerization platform which is used to package your application and all its dependencies together in the form of containers so to make sure that your application works seamlessly in any environment which can be development or test or production. It helps to ensure that the Dev and Production environment are completely same.","Q_Score":2,"Tags":"python,django,docker,containers,virtualenv","A_Id":59907834,"CreationDate":"2020-01-25T07:47:00.000","Title":"Is Docker an alternative for 'virtualenv' while develping Django project?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to build a web app (SPA) that send the schema (not necessarily the raw db schema, but a representation of the data potentially in a JSON format) to the view, so in the view we can:\n\nGenerate grids based on that schema instead of wiring columns\nHandle additional information from these fields, such as if it is editable or not, and the like.\n\nThis web app will allow users to see tabular information in a grid, and potentially do CRUD operations.\nI see a lot of benefits on using the schema (We can implement validators based on the schema, forms generation should be very simple, and best, the impact of adding a simple field to the web app should be easily handled)\nMy question is: Is it a good strategy? Could you help me identify some drawbacks with this approach? (The stack I am using for this is not very important, but just for the sake of clarity, I am using Bottle (python) in the backend, and React in frontend)","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":30,"Q_Id":59914460,"Users Score":1,"Answer":"One drawback I see is the time consumed to maintain this addition that you mention: schema generation, sending, interpreting in the view. But of course this is for you to decide, if this overhead is compensated by the advantages you mentioned. If it is, then go for it. \nOne other thing I would mention is: you want to do validation based on this schema. How many of the validations in your application can be done this way? Are there many cases in which validation will not fit in this pattern? Same question for grid generation, form generation, etc. If there are a lot, then maybe it is not worth it. I have more then once found a automatic solution like this that got me excited only to see later that it does exceptions for this pattern are many and overall I did not gain to much :). \nOverall, you decide. One last thing: try to think long term. 90% of the lifetime of an application is spent in maintenance. Try to understand what  happens after you release the application and bugs\/small features requests are starting to come up.","Q_Score":0,"Tags":"python,design-patterns,model,schema","A_Id":59927836,"CreationDate":"2020-01-26T00:02:00.000","Title":"Is it a good practice to send schema in web application?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to write text that was scraped from a German website into a CSV file. I tried using UTF-8 encoding as such:\nwith open('\/Users\/filepath\/result.csv', 'a', encoding='utf8') as f:\nf.write(text)\nBut this is what appeared in the CSV file instead of with an \u00fc:\nProjekt f\u00c3\u00bcr Alleinerziehende mit mehreren (behinderten) Kindern","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":201,"Q_Id":59921723,"Users Score":1,"Answer":"Try using ISO-8859-15 encoding. Also make sure that when you open the file in an editor, it's encoding is set to same encoding.","Q_Score":0,"Tags":"python,selenium,file,web-scraping,utf","A_Id":59921966,"CreationDate":"2020-01-26T19:05:00.000","Title":"How do you write German text into a CSV file?","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it possible to insert many image in one field of same table. For example one user created a profile and that user have to post some pictures in one field. Most user use another table for store image. Need your help","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":114,"Q_Id":59929178,"Users Score":1,"Answer":"you have to create  different model for that task. Or may be you have to declare array field. I think array field won't work to solve your problem","Q_Score":2,"Tags":"python-3.x,django-models,django-rest-framework","A_Id":59998150,"CreationDate":"2020-01-27T10:23:00.000","Title":"Storing multiple image in one field django rest framework","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We developed web apps in django framework. We have an enterprise Identity Provider which is PingFederate. The main home page (which is different from our site) from chrome browser and edge browser directly recognizes the user and logs them in all the internal websites. We are also on the same network share same domain. We also want to integrate SSO and want to authenticate our users directly with asking password. I researched every where and got to know the authentication is happening by kerbose authentication. Somehow the edge or chrome  is sending some token or id or some TGT ticket to the Identity Provider then they will authenticate and send the username back to the client browser. Can any one please help me how to solve this.\nThanks in advance.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":774,"Q_Id":59976813,"Users Score":1,"Answer":"It sounds like you want to integrate with the PingFederate solution to use it as the identity provider and allow the users of your web apps to login through SSO. If that is the case, you would need to work with whoever responsible for PingFedereate if it is another team.\nChecklist with the PingFederate Admin\n\nYou would need to know if you need to choose the directory will be used to log the users in. \nWhich user attributes you would need to get back in the SAML response.\nWill you sign the SAML request using your app or not.\nWill you start the SSO cycle from your app, which I believe you would, and you will be using SP initiated in this case. \n\nOtherwise, it will be the other way around and will be using IDP Initiated. \n\nSP Initiated - User will call the app URL first and then redirected\nto Ping URL and be sent back to the app.\nIDP Initiated - User will call PingFederate URL and will be sent to the app after authentication. \n\nI will list the steps in here in case it is your team who is also responsible for PingFederate solution:\n\nChanges in PingFederate as SP (service provider) connection\n\nCreate a new IDP (Identity Provider) Adapter for the login page if needed.\n\n\nIDP adapter will be using a Password Credential Validator to do the authentication and also has the configuration for which HTML pages to present to the user. \nCreate the SP connection in Ping with the stuff in the check list.\n\n\nThe connection here will use the adapter in the step above to present the login page\nThen check the user credentials and establish the SSO session if successful.\nAssemble the SAML response with all the required attributes.\nSign the response and send it to the application endpoint configured inside the connection.\n\n\n\nChanges in the web app as the service provider for the user\n\nThe application will need to send the SAML request to the endpoint of the new connection in Ping.\nWait for the response on the dedicated endpoint.\nVerify the SAML response signature using the PingFederate server's public key.\nCreate the local app session and move on.\n\n\nIf you will be using OpenToken, this will change to have another interaction of Adapter-to-Adapter. Just reply with that if this is the case.","Q_Score":0,"Tags":"python,django,saml-2.0,pingfederate","A_Id":60384457,"CreationDate":"2020-01-29T22:56:00.000","Title":"Integrate Django authentication with Enterprise Identity Provider PingFederate","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am creating a mobile app, I want to access a web server that is implemented in Python Django. I found that there is Retrofit in android to communicate with a web server. My question is that whether I have to write Client REST API and Server REST API both. \nAs I am considering that I will write REST API using Retrofit (Client REST API).\nAnd then write a REST API for my server in python Django (Server API).\nI am really confused about what will be the way to communicate with my server that is developed in python Django. And up to what limit I have control on server i.e how much an android app can control(create a database in web server, perform CRUD operations)\nThanks!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":753,"Q_Id":59982739,"Users Score":0,"Answer":"Actually, it is quite simply, independent of the language of your server, basically if your server can respond with a json, you can use Retrofit2 and POST, GET, UPDATE, DELETE, etc...","Q_Score":0,"Tags":"python,android,django-rest-framework,retrofit","A_Id":59983013,"CreationDate":"2020-01-30T09:28:00.000","Title":"Communicate Android app with python Django web server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We want to export data from dynamo db to a file. We have around 150,000 records each record is of 430 bytes. It would be a periodic activity once a week. Can we do that with lambda? Is it possible as lambda has a maximum execution time of 15 minutes?\nIf there is a better option using python or via UI as I'm unable to export more than 100 records from UI?","AnswerCount":4,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":10670,"Q_Id":59988635,"Users Score":1,"Answer":"Guys we resolved it using AWS lambda, 150,000 records (each record is of 430 bytes) are processed to csv file in 2.2 minutes using maximum available memory (3008 mb). Created an event rule for that to run on periodic basis. Time and size is written so that anyone can calculate how much they can do with lambda","Q_Score":1,"Tags":"python,amazon-web-services,aws-lambda,amazon-dynamodb","A_Id":60053826,"CreationDate":"2020-01-30T14:50:00.000","Title":"Exporting data from dynamo db to a csv file","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In Spotfire I have a dashboard that uses both filtering (only one filtering scheme) and multiple markings to show the resulting data in a table.\nI have created a data function which takes a column and outputs the data in the column after the active filtering scheme and markings are applied. \nHowever, this output column is only calculated if I have something marked in every marking. \nI want the output column to be calculated no matter how many of the markings are being used. Is there a way to do this? \nI was thinking I could use an IronPython script to edit the data function parameters for my input column to only check the boxes for markings that are actively being used. However, I can't find how to access those parameters with IronPython. \nThanks!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":156,"Q_Id":59989115,"Users Score":0,"Answer":"I think it would be a combination of visuals being set to OR instead of AND for markings (if you have a set of markings that are being set from others). \nAlso are all the input parameters set to required parameter perhaps unchecking that option would still run the script. In the r script you may want to replace null values as well. \nNot too sure without some example.","Q_Score":0,"Tags":"output,filtering,ironpython,spotfire","A_Id":59990189,"CreationDate":"2020-01-30T15:17:00.000","Title":"Spotfire: Using Multiple Markings in a Data Function Without Needing Something Marked in Each","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"There is data being automatically sent with POST request to the address I'm developing on, in format of JSON string.\nHow should I properly fetch this data in my function based view, so I can manipulate with it?\ndata = requests.get(url).json() did not work for me, it gives me back this error:\ndjango.urls.exceptions.Resolver404: {'tried': [[<URLResolver <URLResolver list> (None:None) 'en\/'>]], 'path': ''}\nAt least, how can I test if there is any data being sent to the url?\nI'm developing in production env.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":47,"Q_Id":59989908,"Users Score":1,"Answer":"Depending on how the data is posted you will be able to find the data with \n\nrequest.POST.get('url')\n\nor if it is not sent as JSON body it will be found within, which will need to be decoded manually\n\nrequest.body","Q_Score":0,"Tags":"python,json,django,python-requests,fetch","A_Id":59990204,"CreationDate":"2020-01-30T15:59:00.000","Title":"What is the right way to fetch data that is being automatically posted to the URL that I'm developing the app on in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created a python web app using the Django framework. I wanted to deploy it online using my domain name. However, I am using the same domain name for my Wordpress site which I have deployed using shared hosting. Is there any way I can deploy my app under the same domain name keeping my website up and running.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":263,"Q_Id":59993764,"Users Score":0,"Answer":"With shared hosting, it might be tricky -- it really depends on the specific way the shared hosting company works.  \nHowever, one alternative that might be worth considering is to use a different subdomain of your domain name.   For example, right now you might have a Wordpress site on www.yourdomain.com.  You could put the Django app on somethingelse.yourdomain.com, and then they could be hosted with completely different providers -- the shared hosting for the Wordpress site, and the Django site somewhere else.  \nIf you made the name of the subdomain match the purpose of the Django site, then it would look pretty good to visitors.  For example, a hotel might have the main site on www.joeshotel.com, using Wordpress, and then a system where people can reserve rooms using Django on reservations.joeshotel.com.","Q_Score":0,"Tags":"python-3.x,wordpress,web-applications,django-deployment","A_Id":60039271,"CreationDate":"2020-01-30T20:09:00.000","Title":"Deploying python web app for wordpress site?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to help someone put a python text game to be displayed with the inputs and output on his html website. What's the easiest way to do this, regarding the many outputs and inputs? Would it be to make it a flask app? I don't really know how else to describe the situation. Answers would be much appreciated.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":33,"Q_Id":59997131,"Users Score":0,"Answer":"I am developing a website with python3.8 and Sanic. It was pretty to use async, await and := ~","Q_Score":1,"Tags":"python,html","A_Id":59997280,"CreationDate":"2020-01-31T02:27:00.000","Title":"Easiest way to put python text game in html?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a PDF File with about 500 pages with a lot of duplicates.\nBefore I made PNG Thumbnails, then I made MD5-hashs to compare everything. That worked fine.\nNow I don't use png thumbnails anymore but tif-files because I have to use \"tiffsep\" to remove some spotcolors.\nIf I compare the hashes of the tif-files or even the hashes of the png-files I made from the tif-files its completly different, even if it visually is the same.\nI tried to remove the datetimefield and the paging-information from the tiff-metadata but it is still the same.\nWhat can I do?\nThats the code how the thumbnails are generated\n    inputpdf = PdfFileReader(path)\n    count_pages = inputpdf.getNumPages()\n    command = \"gs -sDEVICE=tiffsep -dNoSeparationFiles -dLastPage=\"+str(count_pages)+\" -sOutputFile=\"\/home....\/page_%d.tif\"\n    subprocess.Popen(command,shell=True,stdin....)","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":39,"Q_Id":60000785,"Users Score":0,"Answer":"Did solve the problem.\nFirst I made the Tiff-Files to exclude the spotcolors.\nThen I had to convert to JPG and then build the hashes.\nThe hashes of the PNG from the Tiffs weren't the same.","Q_Score":0,"Tags":"python,hash,thumbnails","A_Id":60144366,"CreationDate":"2020-01-31T09:06:00.000","Title":"Compare Tif File Made from PDF pages","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I would like to know if it's possible to 'Activate' and 'Deactivate' the admin site using a custom management command and what i mean by deactivating is commenting the line containing the path of admin.site.urls in the main urls.py file.\nOr if there is a better way to do this.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":128,"Q_Id":60005680,"Users Score":0,"Answer":"I think the best way to do it - write custom middleware.\nYou can detect if current request is request to admin site (for example request.path.startswith('\/admin')) and return 404 error if you disable you admin page.","Q_Score":0,"Tags":"django,python-3.x,django-admin","A_Id":60006268,"CreationDate":"2020-01-31T14:20:00.000","Title":"Django Management command for Activating\/Deactivating admin site","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am on OS Mojave and just used homebrew to install geos and proj and python3 disappeared. I had two versions and now I only have the 2.7 version. I did brew install python3 and it says its already installed but not linked, I then did brew link python as it suggested but it returned an Error: Could not symlink Frameworks\/Python.framework\/Headers Target \/usr\/local\/Frameworks\/Python.framework\/Headers is a symlink belonging to python@2.. \nHow can I go back to having both versions?. I am not 100% installing geos and proj was what caused it but I used python3 3 days ago.  I have also installed phantomjs via homebrew since the last time I used python3.\nI need to have both versions of python installed. What would be the appropriate way of handling this since I seem to have all the files still on my computer?\nThanks in advance!","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1488,"Q_Id":60014044,"Users Score":0,"Answer":"Install Virtual Environment so you can use many and different versions of Python.","Q_Score":1,"Tags":"python,homebrew","A_Id":60014116,"CreationDate":"2020-02-01T04:39:00.000","Title":"Python 3 disappeared from computer - MacOS","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am on OS Mojave and just used homebrew to install geos and proj and python3 disappeared. I had two versions and now I only have the 2.7 version. I did brew install python3 and it says its already installed but not linked, I then did brew link python as it suggested but it returned an Error: Could not symlink Frameworks\/Python.framework\/Headers Target \/usr\/local\/Frameworks\/Python.framework\/Headers is a symlink belonging to python@2.. \nHow can I go back to having both versions?. I am not 100% installing geos and proj was what caused it but I used python3 3 days ago.  I have also installed phantomjs via homebrew since the last time I used python3.\nI need to have both versions of python installed. What would be the appropriate way of handling this since I seem to have all the files still on my computer?\nThanks in advance!","AnswerCount":3,"Available Count":2,"Score":0.0665680765,"is_accepted":false,"ViewCount":1488,"Q_Id":60014044,"Users Score":1,"Answer":"use anaconda python distribution which better for python.","Q_Score":1,"Tags":"python,homebrew","A_Id":60014185,"CreationDate":"2020-02-01T04:39:00.000","Title":"Python 3 disappeared from computer - MacOS","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"When I try to push a python app to Heroku using the command:  \"git push heroku master\" I get the error, \"No matching distribution found for cloud-init==19.3.\"  I tried a suggestion I found on here that said to remove that item from the registration.txt file, run commit and then push again, and keep doing this with the registration.txt list until getting a successful result. However, I continue to get this error regarding the cloud-init version and can't get beyond it.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":171,"Q_Id":60019341,"Users Score":1,"Answer":"I found the solution for this issue. I emptied the requirements.txt file to only two items, flask & gunicorn. Then realized that while I ran commit & push again after the changes I wasn't running add.","Q_Score":0,"Tags":"python,git,heroku","A_Id":60027175,"CreationDate":"2020-02-01T17:24:00.000","Title":"Get error when attempting to push app to Heroku","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm a complete beginner and a relative of mine asked me to build a simple 'contact us' website for them. It should include some information about his company and a form in which people that visit the website are able to send mails to my relative. I have been playing around with vue.js in order to build the frontend. I now want to know how to put the form to send mails and I read it has to be done with backend, so I thought I could use django as I have played with it in the past and I am confident using python. Is it too much for the work that I have to do? Should I use something simpler? I accept any suggestions please, Thanks.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":167,"Q_Id":60021283,"Users Score":0,"Answer":"Flask\nYou can use Flask. it is simpler than Django and easy to learn. you can build a simple website like the one you want in less than 50 line.\n\nWordpress\nIf you want you can use Wordpress. it's easy to install and many hosting services support it already. Wordpress has so many plugins and templates to build contact us website in 10 minutes.\n\nWix\nwix is easy, drag-n-drop website builder with many pre-build templates that you can use, check them out and you will find what you need.","Q_Score":1,"Tags":"python,django,vue.js,web","A_Id":60021443,"CreationDate":"2020-02-01T21:35:00.000","Title":"is django overkill for a contact us website?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm a complete beginner and a relative of mine asked me to build a simple 'contact us' website for them. It should include some information about his company and a form in which people that visit the website are able to send mails to my relative. I have been playing around with vue.js in order to build the frontend. I now want to know how to put the form to send mails and I read it has to be done with backend, so I thought I could use django as I have played with it in the past and I am confident using python. Is it too much for the work that I have to do? Should I use something simpler? I accept any suggestions please, Thanks.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":167,"Q_Id":60021283,"Users Score":0,"Answer":"You will probably should use something ready like Wix or Wordpress if want to do it fast if you prefer to learn in the process you can do it with Django and Vue, but this is indeed little bit overkill","Q_Score":1,"Tags":"python,django,vue.js,web","A_Id":60021392,"CreationDate":"2020-02-01T21:35:00.000","Title":"is django overkill for a contact us website?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am currently rendering an simple HTML table using Flask\/Pandas Dataframe (to_html) using rows from a table in an SQLite3 DB. \nHow do I add checkboxes to the table?\nAfter selections are made dump all the values from the Name column to a text file?\nExample:\n\nID  Name    Manager \n1   server1 manager1\n2   server2 manager2\n\nAny help would be appreciated.\nP.S. This is my first question on Stack overflow. If you need more information please let me know.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":451,"Q_Id":60023407,"Users Score":0,"Answer":"I would do it by workaround here.\n\nCreate html combo box in template.html\nPopulate combobox with values from database in routes.py\nAlso in routes.py read combobox selected value and according to that value change sql request to database - e.g. value 1 - sql query without where condition else add where condition name = (in) selected value(s)\nWhen you send request you can in routes.py choose if you want render_template with different data or if you submit to another route which will export you data to text file (you can stay in pandas and use to_csv)\n\nAlso your question contain multiple problems. It would be better to be more specific.\nIf you would like only to add checkboxes as another column in table then you can, do the filtering by javascript but to pass the selection to flask route by javascript is another much harder thing. Also I would do selection on distinct values rather than all rows values.","Q_Score":5,"Tags":"python,html,pandas,sqlite,flask","A_Id":72276049,"CreationDate":"2020-02-02T05:11:00.000","Title":"How to add checkboxes to a Pandas Dataframe table using Flask?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new in Django, recently I have created several project directories under several virtual-environments. Now I have reopened my recent project directory, but forgot which virtual environment I was using for this project. How to find it out?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":103,"Q_Id":60030114,"Users Score":0,"Answer":"Provided that you have requirements.txt files for your Django projects (which you really should), it should be as easy as comparing the output of pip freeze under your virtual environments with the contents of your requirements files.","Q_Score":0,"Tags":"python,django,virtualenv","A_Id":60030133,"CreationDate":"2020-02-02T20:08:00.000","Title":"How to know my current Django project was created under which virtual environment?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Postgres\nI have USE_TZ=True\nI have TIME_ZONE='America\/Los Angeles'\nI am about to switch TIME_ZONE to UTC.\n\nWill there be negative effects, gotchas, or anything I need to consider? Or will it just work since the date time is standardized? (I notice in my db rows that dates are stored with +08, which is indeed America\/Los Angeles.)\nThe documentation mentions that if I use Postgres, I can swap USE_TZ freely, but doesn't mention changing TIME_ZONE.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":32,"Q_Id":60033438,"Users Score":0,"Answer":"Django always stores date time in UTC and now() always returns time in UTC or according to db.\nso if you convert it using localtime() it will not affect how the value is stored.\nThe thing which matters is how it is presented to user.","Q_Score":0,"Tags":"python,django,time","A_Id":60033519,"CreationDate":"2020-02-03T05:16:00.000","Title":"Does changing Django's TIME_ZONE have any negative effects?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have been using Connect To DataBase Keyword in Robot Framework. Is it possible to add a custom parameter to the keyword?\nFor ex : i want to add dictionary=true to cursor instance below is the keyword that i have used -\n\nEMPDB.Connect To Database    pymysql  ${EMPNAME}  ${EMPUSER}   ${PWD}   ${HOST}   ${PORT}\n\nTo Above Keyword statement can i use dictionary=true? So that when i select query the result i want is along with the column and the values.","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":100,"Q_Id":60034232,"Users Score":2,"Answer":"That's is not possible using the library as is, so you need to implement that feature yourself. Usually DB queries return lists and they do not include column names.","Q_Score":0,"Tags":"python,robotframework","A_Id":60034844,"CreationDate":"2020-02-03T06:40:00.000","Title":"How to pass a custom parameter to Connect To DataBase Keyword in Robot Framework","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an API built using flask which dumps data to s3 using kinesis firehose. So far it is only in one region with load balancer and auto-scaling group containing multiple instances. Now I want to have the flask application in multiple region in order to reduce latency. However, I could find a way to configure Kinesis Firehose stream for different regions. That means, even if I put my application in different regions, Kinesis Firehose will become the bottleneck. \nIs it possible to support multiple regions for kinesis firehose and channel the data based on the closest region?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":782,"Q_Id":60084475,"Users Score":0,"Answer":"When creating the stream using boto3 specify the region. Keep the same stream name but pick different regions each time. If you want to manually do it from the AWS web console then change the region at the top and then create the stream. Keep repeating the process for each region.","Q_Score":0,"Tags":"python,amazon-web-services,amazon-kinesis,amazon-kinesis-firehose","A_Id":64980631,"CreationDate":"2020-02-05T21:36:00.000","Title":"Kinesis Firehose same stream in multiple regions","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"django.core.exceptions.ImproperlyConfigured: Error loading MySQLdb module.\n  Did you install mysqlclient?\n\nGetting this error even installed the mysqlclient\npython version: Python 3.6.9","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":43,"Q_Id":60092294,"Users Score":0,"Answer":"You have to install mysqlclient in the virtual environment using pip install mysqlclient.","Q_Score":1,"Tags":"python,django","A_Id":60092363,"CreationDate":"2020-02-06T10:02:00.000","Title":"Database error in django while running local sever?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I using selennium with python to crawl webpage. But I want to pause and resume everytime when scrolling webpage. Is it possible?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":89,"Q_Id":60097213,"Users Score":0,"Answer":"You could use an explicit wait or poll for certain elements every time you scroll. I would be interested to know if you are dealing with some lazy loading, where the elements you are looking for are not already in the DOM.","Q_Score":0,"Tags":"python,selenium,selenium-webdriver,web-crawler","A_Id":60100509,"CreationDate":"2020-02-06T14:27:00.000","Title":"Is it possible to pause and resume like event when scrolling webpage using selenium python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a coverage report that may be lying or distorted.  It says that I have coverage for a line in my Django model code.  I can't see where that line is being exercised.  I can see that the module is imported, that the class is imported, but not that it's being invoked\/instantiated.\nThus, coverage report says I have Line A covered.  Presumably that means Line B, somewhere, is exercising it.  I'd like to know where Line B is.  Is there a way to find the set of Line-B's (one or more) that are calling Line A, in my tests?  \nIt seems this could be an annotation in the coverage report somehow\/somewhere.  It's definitely knowable, since coverage has to keep track of a thing being used.  \nI'm not seeing it.\nIf this isn't implemented, I'd like to suggest it.  I know, it may be too complex as a full stack trace for each line of execution.  But, maybe just the inspect of the immediate calling frame would be a good start, and helpful.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":387,"Q_Id":60100319,"Users Score":1,"Answer":"Here's a fun way to discover what covers that line:\nInsert a bug in the line.\nIf you then run the tests, the ones truly covering the line will fail. The stacktraces should include Line B.","Q_Score":2,"Tags":"python,unit-testing,pytest,code-coverage,agile","A_Id":66437126,"CreationDate":"2020-02-06T17:15:00.000","Title":"Python Coverage Says Line A is Covered, Need to Know From Where","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"What are the advantages of ViewSet, ModelViewSet and APIView. In the django-rest-framework documents it is not clear, it does not say when to use ViewSet, ModelViewSet and APIView. I want to implement an API that will have a business logic in there, a great business logic with data processing as well, what should be used for this case?\nI researched a lot and managed to understand a little about routers and urlpatterns but I didn't understand which one about views.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":5761,"Q_Id":60115855,"Users Score":11,"Answer":"Summarizing: on one hand you have the APIView, which is the most generic of the three, but also in which you must do almost all business logic 'manually'. You have the class methods mapping http methods (get, post, ...) plus some class attributes to configure things like authentication, rendering, etc.\nOften you'll be developing endpoints to interact with resources (entities, like Users, Products, Orders, etc.) via CRUD operations, and that is what ViewSet is for: they have more semantic class methods like list, create, retrieve ... that the router can then automatically map to urls and http methods at the expense of making some assumptions: for example, the retrieve assumes the http call to be GET \/you_resource\/<pk>. It is more rigid than a generic APIView but it takes away from you some boilerplate\/manual config that you would have to repeat again and again in most cases.\nOne step further is the ModelViewSet, which is an extension of the ViewSet for when you are working with Django models. Just specifying a serializer_class and a queryset you have all the CRUD operations of the ViewSet ready to go. Obviously, you can also add your own methods to a ViewSet or customize the behavior of its default methods.\nIn my experience, it pays off to use ViewSets. The code looks cleaner and you avoid some boilerplate code. The assumptions it makes are reasonable, and I would even say that you probably will end up with a cleaner API design following them.","Q_Score":5,"Tags":"python,django,serialization,django-rest-framework","A_Id":60121034,"CreationDate":"2020-02-07T14:55:00.000","Title":"Difference between ViewSet, ModelViewSet and APIView","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm creating an app with Django as the backend and React as the front-end. I already have the back-end built out, and now I'm trying to build out the React components. \nMy problem is this- right now I have my static files hosted on AWS. So every time I make a change to a component, I need to run collectstatic through django in order for my Django template to read the updated Main.js file.\nHas anyone encountered this issue before? I am new to React, so I may be missing a very simple solution.\nThanks!!","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":137,"Q_Id":60120899,"Users Score":1,"Answer":"Its a necessity.\nInstead I would recommend only pushing to the AWS after you have tested and need the change(s) to be live.","Q_Score":0,"Tags":"python,django,reactjs,amazon-web-services","A_Id":60128382,"CreationDate":"2020-02-07T20:50:00.000","Title":"Django\/React - Static Main.js file with AWS hosting staticfiles","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a webmap which is made in python using Folium.  I am adding various geojson layers from an underlying database.  I would like to do spatial analysis based on the user's location and their position relative to the various map overlays.  As part of this I want to display a marker on the map which indicates the user's current position, and which updates regularly as they move around.\nI know how to add markers to the map from within python, using Folium.\nI know how to get a constantly updating latitude \/ longitude of the user using JS \nnavigator.geolocation.watchPosition(showPosition)\nwhich then passes a position variable to the function showPosition.\nI am currently just displaying this as text on the website for now.\nWhat I have not been able to do is to add a marker to the Folium map from inside the webpage, using JS\/Leaflet (as Folium is just a wrapper for Leaflet, i think I should be able to do this).  \nThe Folium map object seems to be assigned a new variable name every time the webpage is loaded, and I don't know how to \"get\" the map element and add a marker using the Leaflet syntax \nL.marker([lat, lon]).addTo(name_of_map_variable_which_keeps_changing)\nAlternatively there might be a way to \"send\" the constantly changing lat\/lon variables from the webpage back to the python script so that I can just use folium to add the marker.  \nBut I have been unable to figure this out or find the right assistance online and would appreciate any help.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1042,"Q_Id":60127471,"Users Score":0,"Answer":"OK, I have figured out a main part of the question - how to add a user location marker to the Folium map.  It is actually very simple:\nhttps:\/\/python-visualization.github.io\/folium\/plugins.html#folium.plugins.LocateControl\nI am still unable to pass the user's lat\/lon through to my python script so that I can perform spatial queries using that location.  So am looking forward to anyone being able to answer that part.  Though I may have to post that as a separate question perhaps...","Q_Score":0,"Tags":"javascript,python,geolocation,leaflet,folium","A_Id":60205173,"CreationDate":"2020-02-08T13:56:00.000","Title":"How do I add a mobile geolocation marker into a Folium webmap that automatically updates position?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I created a Client with Java and a Server with Python. The Java client receive data using readUTF() of the class DataInputStream. My problem is that the function readUTF() expects a modified version of 'utf-8' that I don't know how to generate in the (Python) server side.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":82,"Q_Id":60135995,"Users Score":0,"Answer":"I got it!. Using the function read() of the class DataInputStream do work. The problem was that I initialized the destination buffer like this: byte[] ans = {}, instead of allocating some bytes. Thanks for everyone!","Q_Score":0,"Tags":"java,python,sockets,utf-8","A_Id":60140280,"CreationDate":"2020-02-09T11:13:00.000","Title":"Convert String into the format that readUTF() expects","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Django web app which currently uses HTML templates with CSS styling. Fairly typical for a Django app. I've been looking to create a more animated GUI for this app and was looking to Kivy to do this. Is it possible to combine these two frameworks to coexist in the same app?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":972,"Q_Id":60146791,"Users Score":0,"Answer":"This can be achieved using Django Serializing, Where you can connect asynchronously with Django models. As per my understanding you want use Django models to fetch data right? Django Serializing will convert models into required format xml, json","Q_Score":1,"Tags":"python,django,kivy","A_Id":63215065,"CreationDate":"2020-02-10T08:44:00.000","Title":"Can I create a Kivy GUI for my Django Web App?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My model (called magazine) has a string field that refers to the location of the image on the hard drive. In flask-admin however, I would like to upload an image to the magazine object instead of a string. Is there a way to specify an image in the model instead of a string?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":124,"Q_Id":60149487,"Users Score":-1,"Answer":"Don't use flask-admin, create the routes and templates yourself so you will have much more freedom with forms","Q_Score":0,"Tags":"python,flask,flask-sqlalchemy,flask-wtforms,flask-admin","A_Id":60149907,"CreationDate":"2020-02-10T11:31:00.000","Title":"How to override the admin model creation form in flask","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm building a Flask App that analyzes data. I want to use Numba to speed up the algorithm. I have tried on the algorithm with Numba and it works perfectly in the Jupyter Notebook.\nHowever, when I try the code in the Flask app, it fails. It seem likes it cannot access to the function that binds with @numba.jit. Is that means that we cannot use Numba in a Flask app?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":943,"Q_Id":60151595,"Users Score":0,"Answer":"It depends on the operations you perform on the functions. you can perform array and other computation operations which was supported by Numba. Structure your code accordingly to utilize Numba functions.","Q_Score":2,"Tags":"python,flask,numba","A_Id":61823371,"CreationDate":"2020-02-10T13:35:00.000","Title":"Can we use Numba in Flask?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm building a Flask App that analyzes data. I want to use Numba to speed up the algorithm. I have tried on the algorithm with Numba and it works perfectly in the Jupyter Notebook.\nHowever, when I try the code in the Flask app, it fails. It seem likes it cannot access to the function that binds with @numba.jit. Is that means that we cannot use Numba in a Flask app?","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":943,"Q_Id":60151595,"Users Score":1,"Answer":"You should be able to use Numba within a Flask application (I do). The issue sounds like the environment that you are launching Flask from is different than the environment that you are running your Jupyter Notebook from. From within your Flask app, you could try printing the sys.path.","Q_Score":2,"Tags":"python,flask,numba","A_Id":60151756,"CreationDate":"2020-02-10T13:35:00.000","Title":"Can we use Numba in Flask?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"How can I use 'serializer.initial_data' in Django Rest-API. \nWhat is the difference between using request.data and serializer.initial_data.","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":2850,"Q_Id":60153223,"Users Score":2,"Answer":"Requests.data contains the data that comes in from the frontend. Arguably, you should leave requests.data alone and use a serializer to convert said data into more complex types. The use cases for serializers are pretty vast ranging, but the most common is translation of data into database model instances.","Q_Score":1,"Tags":"python,django,python-3.x,django-rest-framework","A_Id":60153652,"CreationDate":"2020-02-10T15:12:00.000","Title":"What does 'serializer.initial_data' mean?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to Python and couldn't find this answer online.\nWhen creating a Python Flask application, what exactly determines the Python version used? I inherited an existing Python Flask application that is currently version 3.6 and wanted to upgrade it to a newer version. \nIs this as simple as changing the Python version that is installed on the environment that runs the Python application or is the specific version defined in a project file?\nI have tried updating the version of Python in my local environment but the project version did not change.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":474,"Q_Id":60162744,"Users Score":0,"Answer":"what exactly determines the Python version used? \n\nYou can write whichever Python style you want in the project (2.x or 3.x) as long as it is supported for the version of Flask you are using. \nWhat \"determines\" the version it executes with is which version of Python you specify when you start Flask. As in \"python app.py\" or \"python3 app.py\" will start with either version etc.","Q_Score":1,"Tags":"python,flask","A_Id":60167551,"CreationDate":"2020-02-11T05:51:00.000","Title":"What determines a Python Flask project version?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have project on Google Cloud App Engine. I have set up a cloud Scheduler to make a GET request every 24 hours to a certain endpoint on the app engine which invokes a simple Python script. The script simply reads a Google Sheet and updates the Cloud Firestore with the data from the sheet. It was working perfectly but for the past couple of days it fails to update the Database on scheduled time and gives an error. But when I trigger it manually from the console it works just fine. So that means the problem is not with my script. Can anyone have an idea what could be causing the problem?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":105,"Q_Id":60164299,"Users Score":0,"Answer":"I don't think there is enough information in your question, but I think you should analyze logs. In Cloud Scheduler\/ Jobs you can find column \"Logs\" which contain links for every job. You can access Stockdriver Logging for this particular job directly from there.\nI hope this will help!","Q_Score":0,"Tags":"python,gcloud,google-cloud-scheduler","A_Id":60206867,"CreationDate":"2020-02-11T07:59:00.000","Title":"A Python function being triggered by Google Cloud Scheduler fails to work on scheduled time but executes perfectly fine when I run it manually","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Basically, I'm fighting with the age-old problem that Python's default json encoder does not support datetime. However all the solutions I can find call to json.dumps and manually pass the \"proper\" encoder on each invocation. And honestly, that can't be the best way to do it. Especially if you want to use a wrapper like jsonify to set up your response object properly, where you can't even specify these parameters. \nSo: long story short: how to override the global default encoder in Python's JSON implementation to a custom one, that actually does support the features I want?\nEDIT: ok so I figured out how to do this for my specific use case (inside Flask). You can do app.json_encoder = MyCustomJSONEncoder there. However how to do this outside of flask would still be an interesting question.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":240,"Q_Id":60170355,"Users Score":0,"Answer":"Unfortunately, I could not find a way to set default encoders or decoders for the json module.\nSo the best way is to do what flask do, that is wrapping the calls to dump or dumps, and provide a default in that wrapper.","Q_Score":1,"Tags":"python","A_Id":60171236,"CreationDate":"2020-02-11T13:48:00.000","Title":"Setting global JsonEncoder in Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am learning and building a Python application within a docker container.  My editor is visual studio code.  Whilst learning, I like to click around to see what other code is doing, to help understand it best, but am unsure the best process whilst working with Python.\nFor example, I am importing the 'os' library, but in that library there are lots of capabilities, and it would be good to be able to delve in and see what they are.\nAny process recommendations would be greatly appreciated to help with my learning here.\nThanks,\nDan","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":29,"Q_Id":60173994,"Users Score":0,"Answer":"To help clarify the solution from the comments above, this is what I needed to do to get intellisense working for me in the way I needed.\n\nEnsure your host machine has all the modules\/libraries installed you are going to do (this is on top of your docker container having them, as VS Code cannot see them).  To do this on the site I am working on was python3 -m pip install -r requirements.txt.\n\nNote: This did come up with some bugs, but a quick google helped with these, and were generally around installing python3.6-dev and libmysqlclient-dev.\n\nEnsure VS Code is pointing to the python version you are using (for example, I set mine to python3.6).  This can be done in the bottom-left menu options\n\nOnce these steps are done, you should be able to hover over all imports and classes to get some info, and also ctrl+click will take you into the code to look around it.","Q_Score":0,"Tags":"python,visual-studio","A_Id":60186795,"CreationDate":"2020-02-11T17:04:00.000","Title":"How to view code from 'import' easily (eg. Django code) in visual studio","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"(venv) C:\\Users\\Inter-Wave\\PycharmProjects\\PyShop>python3 manage.py runserver\n'python3' is not recognized as an internal or external command,\noperable program or batch file.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":2921,"Q_Id":60181927,"Users Score":1,"Answer":"For anyone for whom the answer above does not work. You can try this one(For windows only). Find the folder where python 3 installed in your computer. You will see that there is a python.exe. Just copy-paste that file inside that folder once and rename that file as python3.exe. Now all Python commands which starts with python3 .... will work for you in Windows command line. It works because windows installation of Python does not expect commands starting with in \"python3 ....\" format. But with just doing this you can use all commands starting with \"python3\" hassle-free. Enjoy! Remember that, this solution  considers that you added python 3 path to the system variables of windows system beforehand.","Q_Score":0,"Tags":"django,python-3.x","A_Id":60597491,"CreationDate":"2020-02-12T05:50:00.000","Title":"python3 is not recognized as an internal or external command, operable program or batch file showing for creating django runserver","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"following docusign documentations I have written code to send and downloaded signed docs from docusign this was done using the OAuth token generator for development provided by docusign, now I am getting application token using api_client.request_jwt_application_token which hits \/oauth\/token end point, I am using the access_token provided by this to create and send envelop but I get the following error\nerrorCode\": \"USER_AUTHENTICATION_FAILED\",\\r\\n  \"message\": \"One or both of Username and Password are invalid. invalid_request\nI've tried different solutions but so far nothing worked for me","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":142,"Q_Id":60191700,"Users Score":0,"Answer":"Here are the things that you must ensure:\n\nYou have an Integration key (clientID) that is configured correctly.\nYou have an RSA Private key. that key was copied\/pasted exactly as given to your configuration file. New lines must be preserved\nYour URLs are matching the environment. Meaning you use account-d and demo.docusign.net for the sandbox env endpoints.\nYou need the userId which is a GUid for the user that would be impersonated. That user must consent to the application. You have to ensure you pass userId and not accountId and that it is for the same account that you would be using.\n\nIf you confirm all of this and still get an error - I would consider to use our code example to start. I don't see code in your question, but our code example should be a good way to start.","Q_Score":0,"Tags":"python-3.x,jwt,docusignapi","A_Id":60459358,"CreationDate":"2020-02-12T15:26:00.000","Title":"Docusign JWT application access token fails when creating and sending envelop","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a python script that generates a web page. The script does not generate any output at all for at least three minutes, so the browser stops before the page loads.\nWhere is this timeout occurring? Is it the browser giving up? Is it Apache serving the page timing out?\nMore importantly, is there a way to control this timeout to allow the page to load?\nMy workaround is to have a space character sent to the browser every 30 seconds or so to keep the page alive, but that is an ugly hack.\nRunning Apache 2.4.6 on Red Hat Enterprise 7.6 with Python 3.7.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":18,"Q_Id":60194794,"Users Score":0,"Answer":"Thank you.  \nIt was as simple as adding a TimeOut value to the httpd.conf file and restarting the httpd service.","Q_Score":0,"Tags":"python,apache,timeout","A_Id":60195377,"CreationDate":"2020-02-12T18:25:00.000","Title":"Web page doesn't generate output for three minutes and dies. Where is the connection dying?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Django application, which I hosted on pythonanywhere. For the database, I have used SQLite(default).\nSo I want to know how many users my applications can handle?\nAnd what if two user register form or make post at same time, will my application will crash?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":490,"Q_Id":60197134,"Users Score":0,"Answer":"SQLite supports multiple users, however it locks the database when write operations is being executed.\nIn other words,concurrent writes cannot be treated with this database, so is not recommended.\nYou can use PostgreSQL or MySQL as an alternative.","Q_Score":3,"Tags":"python,django,database,sqlite","A_Id":66449913,"CreationDate":"2020-02-12T21:27:00.000","Title":"How many users can Sqlite can handle , Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How can I cycle through items in a DynamoDB table?\nThat is, if I have a table containing [A,B,C], how can I efficiently get item A with my first call, item B with my second call, item C with my third call and item A again with my fourth call, repeat?\nThis table could in the future expand to include D, E, F etc and I would like to incorporate the new elements into the cycle. \nThe current way I am doing it is giving each item an attribute \"seen\". We scan the whole table, find an element that's not \"seen\" and put it back as \"seen\". When everything has been \"seen\", make all elements not \"seen\" again. This is very expensive.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":171,"Q_Id":60200081,"Users Score":0,"Answer":"The efficient way to return items that haven't been seen would be to have an attribute of seen=no included when inserted.  Then you could have a global secondary index over that attribute which you could then Query().\nThere isn't an efficient way to reset all the seen=yes attributes back to no.  Scan() and Query() would both end up returning the entire table and you'd end up updating records one by one.  That will not be fast nor cheap with a large table. \nEDIT\nOnce all the records have seen=\"yes\" and you want to reset them back to seen=\"no\"  A query on the GSI suggested above will work exactly like a scan...every record will have to be read and then updated.  \nIf you have 1M records, each about 1K, and you want to reset them...you're going to need\n250K reads (since you can read 4 records with a single 4KB RCU)\n1M writes","Q_Score":0,"Tags":"python-3.x,database,amazon-web-services,amazon-dynamodb,boto3","A_Id":60211532,"CreationDate":"2020-02-13T03:37:00.000","Title":"How can I cycle through items in a DynamoDB table?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How can I cycle through items in a DynamoDB table?\nThat is, if I have a table containing [A,B,C], how can I efficiently get item A with my first call, item B with my second call, item C with my third call and item A again with my fourth call, repeat?\nThis table could in the future expand to include D, E, F etc and I would like to incorporate the new elements into the cycle. \nThe current way I am doing it is giving each item an attribute \"seen\". We scan the whole table, find an element that's not \"seen\" and put it back as \"seen\". When everything has been \"seen\", make all elements not \"seen\" again. This is very expensive.","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":171,"Q_Id":60200081,"Users Score":2,"Answer":"I think the simplest option is probably:\n\nuse scan with Limit=1 and do not supply ExclusiveStartKey, this will get the first item\nif an item was returned and LastEvaluatedKey is present in the response, then re-run scan with ExclusiveStartKey set to the LastEvaluatedKey of the prior response and again Limit=1, repeat step 2 until no item returned or LastEvaluatedKey is absent\nwhen you get zero items returned, you've hit the end of the table, goto step 1\n\nThis is an unusual pattern and probably not super-efficient, so if you can share any more about what you're actually trying to do here, then we might be able to propose better options.","Q_Score":0,"Tags":"python-3.x,database,amazon-web-services,amazon-dynamodb,boto3","A_Id":60200395,"CreationDate":"2020-02-13T03:37:00.000","Title":"How can I cycle through items in a DynamoDB table?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have been told it is 'bad practice' to return data from a Django view and use those returned items in Javascript that is loaded on the page.\nFor example: if I was writing an app that needed some extra data to load\/display a javascript based graph, I was told it's wrong to pass that data directly into the javascript on the page from a template variable passed from the Django view.\nMy first thought: \n\nJust get the data the graph needs in the django view and return it in a context variable to be used in the template. Then just reference that context variable directly in the javascript in the template. \n\nIt should load the data fine - but I was told that is the wrong way.\nSo how is it best achieved?\nMy second thought: \n\nSpin up Django Rest Framework and create an endpoint where you pass any required data to and make an AJAX request when the page loads - then load the data and do the JS stuff needed. \n\nThis works, except for one thing, how do I get the variables required for the AJAX request into the AJAX request itself? \nI'd have to get them either from the context (which is the 'wrong way') or get the parameters from the URL. Is there any easy way to parse the data out of the URL in JS? It seems like a pain in the neck just to get around not utilizing the view for the data needed and accessing those variables directly in the JS.\nSo, is it really 'bad practice' to pass data from the Django view and use it directly in the Javascript? \nAre both methods acceptable?\nWhat is the Django appropriate way to get data like that into the Javascript on a given page\/template?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":285,"Q_Id":60209990,"Users Score":2,"Answer":"Passing data directly is not always the wrong way to go. JS is there so you can execute code when everything else is ready. So when they tell you it's the wrong way to pass data directly, it's because there is no point in making the page and data heavier than it should be before JS kicks in. \nBUT it's okay to pass the essential data so your JS codes knows what it has to do. To make it more clear, let's look into your case:\nYou want to render a graph. And graphs are sometimes heavy to render and it can make the first render slow. And most of the time, graphs are not so useful without the extra context that your page provides. So in order to make your web page load faster, you let JS load your graph after your webpage has been rendered. And if you're going to wait, then there is no point in passing the extra data needed because it makes the page heavier and slows down the initial render and it takes time to parse and convert those data to JSON objects. \nBy removing the data and letting JS load them in the background, you make your page smaller and faster to render. So while a user is reading the context needed for your graph, JS will fetch the data needed and renders the graph. This will cause your web page to have a faster initial render.\nSo in general:\nWhen to pass data directly:\n\nWhen the initial data is necessary for JS to do what it has to (configs, defaults, etc).\nWhen the time difference matters a lot and you can't wait too much for an extra request to complete the render.\nWhen data is very small.\n\nWhen not to pass data directly:\n\nWhen rendering the extra data takes time anyway, so why not get the data latter too?\nWhen the data size is big.\nWhen you need to render something as fast as possible.\nWhen there are some heavy processes needed for those data.\nWhen JS can make your data size smaller (Decide what kind of data should be passed exactly using options that are only accessible by JS.)","Q_Score":0,"Tags":"javascript,python,django,django-templates,django-views","A_Id":60210737,"CreationDate":"2020-02-13T14:20:00.000","Title":"Best practice for getting data from Django view into JS to execute on page?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"A computational scientist where I work wrote a program that scores inputs using a machine learning model built with scikit-learn. My task is to make this ML scorer available as a microservice.\nSo I wrote a few lines of code using Flask to accomplish this. Mission achieved!\nWell, not quite. Because this service is going to be beaten on pretty heavily at times, it needs to be able to crunch on several requests in parallel. (I.e., on multiple cores. We have about 20 on our server.) A solution that I can achieve with about ten minutes of effort is to just spin up ten or twenty of these little REST servers on different ports and round-robin to them using nginx as a reverse proxy.\nAlthough this will work fine, I am sure, I think it would be more elegant to have a single Python server handling all the requests, rather than having twenty Python servers. So I started reading up on WSGI and uWSGI and a bunch of other things. But all that I have accomplished with all this reading and web surfing is ending up very confused.\nSo I'll ask here instead of trying to unravel this on my own: Should I just stick with the brute force approach I described above? Or is there something better that I might be doing?\nBut if doing something \"better\" is going to require days of effort wading through incomprehensible documentation, doing frustrating experimentation, and pulling out all of my hair, then I'd rather just stick with the dumb brute force approach that I already understand and that I know for sure will work.\nThanks.","AnswerCount":2,"Available Count":1,"Score":0.2913126125,"is_accepted":false,"ViewCount":1334,"Q_Id":60215028,"Users Score":3,"Answer":"I'd suggest migrating so FastAPI for this. It is significantly faster, really easy to use (especially if you're migrating from Flask), and is used by a lot of people for ML inference.\nFastAPI uses the newer async functionality in python, which allows it to handle significantly more requests with the same amount of resources. \nYou can also use existing docker containers for either flask or fastapi rather than configuring yourself.","Q_Score":0,"Tags":"python,nginx,flask,wsgi","A_Id":60215547,"CreationDate":"2020-02-13T19:17:00.000","Title":"Using Flask with CPU-bound requests that need to be parallelized onto multiple cores","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am getting the error when using pdf2image module:\nfrom pdf2image import convert_from_path\npages = convert_from_path('mypdf', 500)\nfor page in pages:\n    page.save('out.jpg', 'JPEG')","AnswerCount":1,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":5259,"Q_Id":60220545,"Users Score":7,"Answer":"I'm going out on a limb and guessing your python file is called pdf2image.py. Try naming it something else.","Q_Score":2,"Tags":"python-3.x,image,pypdf2","A_Id":61492692,"CreationDate":"2020-02-14T05:34:00.000","Title":"\"ImportError: cannot import name 'convert_from_path' from partially initialized module 'pdf2image' (most likely due to a circular import)\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using below version\npython 3.7.4\nDjango 2.0.5\nMySQL 5.5\nrestframework 3.0 \nwhile running getting error as below, please help me\nFile \"C:\\Users\\Imbesat Anwar\\AppData\\Local\\Programs\\Python\\Python37\\lib\\site-packages\\rest_framework\\settings.py\", line 22, in \n    from django.utils import importlib, six\nImportError: cannot import name 'importlib' from 'django.utils' (C:\\Users\\Imbesat Anwar\\AppData\\Local\\Programs\\Python\\Python37\\lib\\site-packages\\django\\utils__init__.py)","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":424,"Q_Id":60221210,"Users Score":0,"Answer":"You need to upgrade your djangorestframework to 3.1 or higher.","Q_Score":0,"Tags":"python-3.x,django-rest-framework","A_Id":60296834,"CreationDate":"2020-02-14T06:34:00.000","Title":"from django.utils import importlib, six ImportError: cannot import name 'importlib' from 'django.utils'","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Python Flask app that seems to be otherwise working on the AWS Elastic Beanstalk platform. The one thing I can't figure out is where to save files that my web app allows users to upload. When run locally, I simply provide a path where the files are to be saved but once deployed to AWS EB, I am confused what I should change this path to. I assume I am missing something in this process and if someone could provide some guidance, I would greatly appreciate it.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":354,"Q_Id":60233266,"Users Score":0,"Answer":"Try using Amazon S3 to store files with your Flask Application. Explore Flask Boto3 Module. This module can be interface between your Flask Application and File Storage Service at Amazon.","Q_Score":0,"Tags":"python,flask,amazon-elastic-beanstalk","A_Id":60236985,"CreationDate":"2020-02-14T20:43:00.000","Title":"Upload folder path for AWS Elastic Beanstalk","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Flask-SQLAlchmey app running in Gunicorn connected to a PostgreSQL database, and I'm having trouble finding out what the pool_size value should be and how many database connections I should expect.\nThis is my understanding of how things work:\n\nProcesses in Python 3.7 DON'T share memory\nEach Gunicorn worker is it's own process\nTherefore, each Gunicorn worker will get it's own copy of the database connection pool and it won't be shared with any other worker\nThreads in Python DO share memory\nTherefore, any threads within a Gunicorn worker WILL share a database connection pool\n\nIs that correct so far? If that is correct, then for a synchronous Flask app running in Gunicorn: \n\nIs the maximum number of database connections = (number of workers) * (number of threads per worker)?\nAnd within a worker, will it ever use more connections from a pool than there are workers?\n\nIs there a reason why pool_size should be larger than the number of threads? So, for a gunicorn app launched with gunicorn --workers=5 --threads=2 main:app should pool_size be 2? And if I am only using workers, and not using threads, is there any reason to have a pool_size greater than 1?","AnswerCount":3,"Available Count":1,"Score":0.3215127375,"is_accepted":false,"ViewCount":4431,"Q_Id":60233495,"Users Score":5,"Answer":"Adding my 2 cents. Your understanding is correct but some thoughts to consider:\n\nin case your application is IO bound (e.g. talking to the database) you really want to have more than 1 thread. Otherwise your CPU wont ever reach 100% of utilization. You need to experiment with number of threads to get the right amout, usually with load test tool and comparing requests per second and CPU utilization.\nHaving in mind the relation between number of workers and connections, you can see that when changing the number of workers, you will need to adjust the max pool size. This can be easy to forget, so maybe a good idea is to set the pool size a little above the number of workers e.g. twice of that number.\npostgresql creates a process per connection and might not scale well, when you will have lots of gunicorn processes. I would go with some connection pool that sits between your app and the database (pgbouncer being the most popular I guess).","Q_Score":19,"Tags":"python,database,sqlalchemy,flask-sqlalchemy,gunicorn","A_Id":60371314,"CreationDate":"2020-02-14T21:03:00.000","Title":"Choosing DB pool_size for a Flask-SQLAlchemy app running on Gunicorn","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I just can\u2019t find any information about the implementation of the system of adding to favorites for registered users.\nThe model has a Post model. It has a couple of fields of format String. The author field, which indicates which user made the POST request, etc.\nBut how to make it so that the user can add this Post to his \u201cfavorites\u201d, so that later you can get a JSON response with all the posts that he added to himself. Well, respectively, so that you can remove from favorites.\nAre there any ideas?","AnswerCount":1,"Available Count":1,"Score":-0.1973753202,"is_accepted":false,"ViewCount":507,"Q_Id":60249656,"Users Score":-1,"Answer":"You can add a favorite_posts field (many-to-many) in your Author model.","Q_Score":0,"Tags":"python,django,django-rest-framework","A_Id":60252462,"CreationDate":"2020-02-16T14:44:00.000","Title":"How to create \"add to favorites\" functional using Django Rest Framework","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a django app that allows user to login but I want to have only one user for one device.After some research getting the mac address of device from which users login and then storing the mac address in database seems to be good logic.How can I do so?Any python packages or so??","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":293,"Q_Id":60250187,"Users Score":0,"Answer":"You can't get this information on your host server because MAC address uniquely identifies the running computer so it would be a security vulnerability.\nThere are more user identification options such as local storage or just cookies.","Q_Score":0,"Tags":"python,django,database,mac-address","A_Id":60250280,"CreationDate":"2020-02-16T15:42:00.000","Title":"How to add Mac-address in Django framework","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"All the articles about web scraping in Python I came across quoted BeautifulSoup and Selenium as the main tools to use to retrieve HTML and JavaScript content from a webpage.\nHowever, I have not found a way to automatically update the data received from this same webpage without the need to send it a new request.\nIs it impossible to do in Python what you would do with Google Chrome, that is, simply opening a webpage and looking at it being automatically updated by the host itself?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":259,"Q_Id":60257740,"Users Score":0,"Answer":"Yes, it is possible. For example, you can download elements of the DOM tree in a loop if the content is dynamically modified using JavaScript. You can also call your own JavaScript to perform a specific action. Alternatively, you can even write and upload your own browser plugin. In general, in selenium you can control the browser to a large extent, just like a normal user, without the need to refresh the page again.","Q_Score":0,"Tags":"javascript,python,selenium,beautifulsoup,screen-scraping","A_Id":60258897,"CreationDate":"2020-02-17T07:30:00.000","Title":"Web scraping: update data like in Chrome?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a python regression model that predicts one's level of happiness based on user-input data, i have trained and tested it using Python.\nBut I'm using React Native to create my mobile application. \nMy mobile application will take in the user-input data needed and will output a prediction on their level of happiness. Anyone has an idea on how to implement this? Any advice would be appreciated! I lack the experience, but have an interest in this area, Im still learning so please help me out :)","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":117,"Q_Id":60263706,"Users Score":1,"Answer":"You need to create python API and call it from the mobile application by passing the input features. Python API will return you the forecasted value. This API will load the regression model and make a forecast on given input features. I hope It will help.","Q_Score":0,"Tags":"python,react-native,linear-regression,mobile-application","A_Id":60264105,"CreationDate":"2020-02-17T13:37:00.000","Title":"Implementing saved python regression model to react expo application","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying different python libraries like pdftotree, pdfminer, tabula etc. But could not get the exact results. I mean I can get text from PDF, Images and Tabular data in HTML, but not as maintained and organized as original PDF file. Can someone help me with something regarding this? I would be thankful.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":464,"Q_Id":60282551,"Users Score":0,"Answer":"Mostly yes.  Translate the PDF to SVG, and embed the SVG in your web page.\nSVG's image model (what it can represent and how) is a near-superset of the PDF image model (which is itself a superset of PostScript), though SVG lacks some of the print-specific features of PDF.  There are probably quite a few PDF->SVG converters out there already.  Googling \"Pdf to SVG\" turned up quite a few promising hits\nThere will be some complications:\n\nMany PDF files are longer than 1 page.  You might need to generate 10 SVG files for a single 10 page PDF file, and then build a web page around those 10 SVGs.  Throw in some dynamic HTML to \"turn pages\" and you've got a good web-based PDF viewer.\nThere are parts of PDF that aren't within its image model at all... bookmarks, annotations (form fields, digital signatures), document metadata (author, creation date, etc), and so forth.  Some of the non-image-model stuff is common enough that a PDF to SVG utility might handle it directly (links), while other stuff doesn't have an HTML equivalent and would be lost.\n\nYou could preserve the appearance of a digital signature, but the actual security represented by those visuals would be gone.  Preserving that signature's appearance could be considered lying about the security.","Q_Score":1,"Tags":"python,html,pdf,file-conversion,pdf-conversion","A_Id":60284486,"CreationDate":"2020-02-18T13:56:00.000","Title":"Is there any way of generating exact HTML page from a PDF file?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have set up a small flask webpage but in only runs on localhost  while I would like to make it run on my local network, how do I do that?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":29,"Q_Id":60283309,"Users Score":1,"Answer":"Just my 2 cents on this, I just did some research, there are many suggestions online...\nAdding a parameter to your app.run(), by default it runs on localhost, so change it to app.run(host= '0.0.0.0') to run on your machines IP address.\nFew other things you could do is to use the flask executable to start up your local server, and then you can use flask run --host=0.0.0.0 to change the default IP which is 127.0.0.1 and open it up to non local connections.\nThe thing is you should use the app.run() method which is much better than any other methods.\nHope it helps a little, if not good luck :)","Q_Score":0,"Tags":"python,flask,localhost,wifi,python-3.7","A_Id":60283756,"CreationDate":"2020-02-18T14:37:00.000","Title":"I have set up a small flask webpage but in only runs on localhost while I would like to make it run on my local network python3.7","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Multiple issues arise when I try to run tests in parallel.\nAccording to the docs, \"test_\" is prepended to the database name specified in DATABASES. I used the name \"postgres\", so the database created when running tests is called test_postgres. When running tests in parallel, the following databases are created (which is expected): test_postgres_1, test_postgres_2, test_postgres_3, and test_postgres_4. When running all tests with the --parallel=4 option, however, every test fails with the following message: django.db.utils.OperationalError: FATAL:  database \"postgres_x\" does not exist where x can be 1, 2, 3 or 4. I can see that the following databases have been created: test_postgres_x where x can be 1, 2, 3 or 4. Where's \"postgres_x\" coming from? Why isn't \"test_\" being prepended to these?\nFurthermore, if I manually create the expected databases postgres_x (x = 1 to 4), the migrations applied to the \"main\" database aren't applied to the clones. This results in errors like this: django.db.utils.ProgrammingError: relation \"users_user\" does not exist. Roughly 1\/4 tests pass when using 4 cores.\nLastly, if I try to migrate postgres_x by using migrate --database=postgres_x, I get: django.db.utils.ConnectionDoesNotExist: The connection postgres_x doesn't exist.\nI have ensured that all tests are isolated just so I can run them in parallel. What am I supposed to do?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":881,"Q_Id":60291234,"Users Score":1,"Answer":"Instead of building your test harness yourself I suggest using pytest and pytest-django and pytest-xdist this will handle the db creation and migration for each parallel worker. (pytest can run Django UnitTest tests without modification)","Q_Score":3,"Tags":"python,django,django-rest-framework,postgresql-11,django-tests","A_Id":60291722,"CreationDate":"2020-02-19T00:11:00.000","Title":"Errors when running tests in parallel","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a base app which is used by sub-apps.\nI have an AbstractUser defined in the base app and I need to add a relation to a sub-app model if the sub-app is installed.\nI understand that my new field will be present in the user table in the database, but with a null value if the sub-app is note installed.\nMy problem is to reference the foreign key I had to a model that does not exists if the sub-apps is not installed.\nDoes I need to transfer the model from the sub-apps to the base app or is there another solution like a conditionnal foreign key constraint in my AbstractUser model.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":101,"Q_Id":60298233,"Users Score":0,"Answer":"I think you need a stub sub-app to plug the hole if it's \"not installed\". All it does is declare the model so that there's a table in the database (but no records). You could later replace it with the real sub-app and populate the table through it.","Q_Score":1,"Tags":"python,django","A_Id":60301859,"CreationDate":"2020-02-19T10:30:00.000","Title":"How to define a foreign key in an Django app model which is ignored if a sub-app is not installed","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a saved model with h5 format created using keras with tensorflow v1.x backend. I can no longer load this model in keras with tensorflow v2.x backend using keras.models.load_model. Is there anyway to migrate the saved model to make it compatible with newer keras with tensorflow v2.x backend?\nSo far I have found tools \/ tutorials to migrate the code but I could not find any useful way to upgrade the saved models. I know there is tf.compat.v1.saved_model.load method for tensorflow but I cannot really use that as I saved the model using keras.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":937,"Q_Id":60304558,"Users Score":3,"Answer":"You should be able to load the same model in TensorFlow 1.x and 2.x, but for this you need to use a version of Keras that supports both, for example, Keras 2.3.1","Q_Score":2,"Tags":"python,tensorflow,keras","A_Id":60372531,"CreationDate":"2020-02-19T16:07:00.000","Title":"How to load keras model with tensorflow v1.x backend in keras with tensorflow v2.x backend?","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to create a function on Azure Function Apps that is given back a PDF and uses the python tika library to parse it.\nThis setup works fine locally, and I have the python function set up in Azure as well, however I cannot figure out how to include Java in the environment? \nAt the moment, when I try to run the code on the server I get the error message \n\nUnable to run java; is it installed?\n  Failed to receive startup confirmation from startServer.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":268,"Q_Id":60320171,"Users Score":0,"Answer":"So this isnt possible at this time. To solve it, I abstracted out the tika code into a Java Function app and used that instead.","Q_Score":1,"Tags":"java,python,azure,apache-tika","A_Id":60635648,"CreationDate":"2020-02-20T12:40:00.000","Title":"Tika in Python Azure Function","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created a sign in page for my blog, using bootstrap and django. I recently imported crispy forms and when I try and go to the page I get the following error: TemplateDoesNotExist at \/register\/. However all my redirects and URLs are setup correctly.\nOn the Django debug it says that the error is in my base HTML file, under the head section where I imported bootstrap CSS. I can provide any code necessary. It says this on my server: django.template.exceptions.TemplateDoesNotExist: bootsrap4.4.1\/uni_form.html.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":873,"Q_Id":60322513,"Users Score":2,"Answer":"set CRISPY_TEMPLATE_PACK = 'bootstrap4'. Looks like you have it currently set to the full version number.","Q_Score":0,"Tags":"python,html,django,django-crispy-forms","A_Id":60359339,"CreationDate":"2020-02-20T14:45:00.000","Title":"Error when using crispy forms with Django and bootstrap","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My java code generates Python file from XML input. In order to validate this translation, I would like to go through Python output file and check its content. Right now I am just using String contains method but I think if I could parse Python code into Java POJO, that would make this testing easy. If you think, there is another way to perform this unit testing. Kindly suggest. Thanks in advance.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":274,"Q_Id":60335154,"Users Score":1,"Answer":"You can parse python code using antlr library. Via antlr you can build AST (Abstract Syntax Trees) and validate it","Q_Score":0,"Tags":"java,python,unit-testing,parsing,junit","A_Id":60335610,"CreationDate":"2020-02-21T08:57:00.000","Title":"How do I parse Python Script(py) file into Java POJOs?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need have MultipleChoiceField field in a form that should have over 50000 choices, therefore I cannot render it properly; I emptied the choices and went through an Ajax call to filter the options depending on the user inputs. Problem is that Django is obviously complaining that the choice is not part of the empty choices I provided.\nI think of three solutions to fix this but would like to know which one is 'best practice' or if there was a better one :\n\nCreate a second form which I check when the request is POST, same as the first one but with the choices initialized at the server starts\nDefine the __init__ of the form where if passed a parameter it would set choices to a variable initialized outside the form at the server starts\nFind a way to display the input without displaying the options in the template","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":55,"Q_Id":60350681,"Users Score":0,"Answer":"I went through the second option:\n\nin the class object the queryset \/ choices is set to the full list \nin the init it is set to empty\n\nThis show nothing in the template (and I add through Ajax) but allow everything in the cleaning","Q_Score":0,"Tags":"python,django,django-forms","A_Id":60361934,"CreationDate":"2020-02-22T09:17:00.000","Title":"MultipleChoiceField with massive choices best practice","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have already disabled the selected choice by clicking on Tools > Preferences > Editor > Advanced Tab and then unchecking the \u201csave files after each run\u201d radio button, but whenever I run a file it still shows up.\nThere\u2019s no other relevant question addressing this issue on here or any major Anaconda-related forum, so I would appreciate advice to solve the bug.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":381,"Q_Id":60354254,"Users Score":1,"Answer":"You cannot run a *.py file without saving it first. So, while you try to run the file, it implicitly saves the file first and then runs. That is true regardless of your editor \/ IDE of choice.","Q_Score":0,"Tags":"python,anaconda,spyder","A_Id":60354564,"CreationDate":"2020-02-22T16:30:00.000","Title":"Why do .py files always save before running in Spyder despite disabling the option?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"This month, I learnt Python. I compiled the code and am able to run it on my laptop.  A simple code that asks the user yes\/no responses to questions that helps them traverse through a flowchart and end up with a final choice\/result.  \nHow do I turn this into a Python Web Application that can be accessed by others over a URL and not be dependent on my laptop to run it?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":208,"Q_Id":60354832,"Users Score":1,"Answer":"You need to separate the parts of your app that have its logic from the ones which react to and update window content.\nThen you need to rewrite the window management part for the web. From the scratch. Also other parts if they rely on things that are not available in a browser (usually local filesystem access).\nIt is doable, but not that trivial as web apps have different architecture from desktop apps, there are issues with concurrency, preserving app state, and browser limitations, to name few.\nAnything more detailed requires you to describe what it is that your app does and how.","Q_Score":0,"Tags":"python,saas","A_Id":60354901,"CreationDate":"2020-02-22T17:29:00.000","Title":"How to move my Python application to the web?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've built myself a flask web server, and am deploying it with Gunicorn. It works perfectly well with the default flask app.run(), but this isn't meant for production, so up until now I've had my flask app running on gunicorn.\nHowever, since adding my TensorFlow program to my site, when I go to run a prediction it runs forever, I have timeout set to like 5 minutes. I tested with a print statement before and a print statement after my predict. Second print never shows up.\nAny ideas?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":183,"Q_Id":60356414,"Users Score":0,"Answer":"If you are running heavy calculations inside the route, you better change your program design.\nAt your route start the job on some other thread or process and return the status of the process start and ID to query its progress.\nThen you call query with polling [or web sockets] your heavy task with your ID, and return its status till the process is done and you can return the results","Q_Score":3,"Tags":"python,tensorflow,gunicorn,tensorflow2.0","A_Id":60356594,"CreationDate":"2020-02-22T20:20:00.000","Title":"Tensorflow getting stuck on prediction when deploying with gunicorn","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am given X RabbitMQ queues. Some of the queues contain duplicate messages (message is stored in queue A as well as in queue B for example).\nI am trying to achiveve one thing: process all the messages from \"input\" queues (I made a consumer that connects to these queues), remove duplicate messages on the go and send the result data to one output queue.\nWhat would be the fastest and most efficient way to do this? \nAs far as I know AMQP message_id property is optional, so I have to implement some kind of comparing \"seen\" messages to the newly arrived ones to achieve my goal.\nHashing message bodies came to my mind, but as I am relatively new to algorithms I am not sure which function to use and what to focus on.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":160,"Q_Id":60363070,"Users Score":1,"Answer":"I ended up hashing the message body using SHA1 and storing hash of seen messages.\nMessages that have not been seen are forwarded to result queue, already seen are discarded.","Q_Score":0,"Tags":"python,rabbitmq,amqp,pika","A_Id":60410605,"CreationDate":"2020-02-23T14:14:00.000","Title":"What is the best way to merge RabbitMQ queues using Python pika library?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Django Project and want to connect to SQL Server 2019. But I have a problem when doing migration. Here is the error message:\n\ndjango.db.utils.NotSupportedError: SQL Server v15 is not supported.\n\nI'm using Django 2.1.15 and SQL Server Microsoft SQL Server 2019 (RTM) - 15.0.2000.5 \nDoes it mean this Django version cannot using SQL Server 2019?","AnswerCount":3,"Available Count":1,"Score":0.0665680765,"is_accepted":false,"ViewCount":3906,"Q_Id":60364005,"Users Score":1,"Answer":"I just create an account to answer thi question. I lost a lot of time until can fix that. \nTo work with SQL Server 2019 i nedded to update the Django to actual version, 3.x and installed django-mssql-backend, django-pyodbc, pyodbc\nIn youd DATABASE definitions, add this line to work:\n'OPTIONS': {\n            'driver': 'ODBC Driver 17 for SQL Server',\n        },","Q_Score":2,"Tags":"python,sql,sql-server,django","A_Id":60697994,"CreationDate":"2020-02-23T15:50:00.000","Title":"Django Cannot Connect to SQL Server 2019","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I appreciate it if somebody gives the main idea of how to handle submission\/retrieval form implementation in Bootstrap modals. I saw many examples on google but it is still ambiguous for me. Why it is required to have a separate Html file for modal-forms template? Where SQL commands will be written? What is the flow in submission\/retrieval forms (I mean steps)? What is the best practice to implement these kind of forms? I'm fairly new to Django, please be nice and helpful.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":86,"Q_Id":60387127,"Users Score":0,"Answer":"No need for separate file for modal-form. Here MVT structure following, whenever forms are used. Easy interaction to template. Moreover if you go through Django documentation, you will get to know easily. \nSubmission - mention the form action url. It will call that and check the django forms","Q_Score":0,"Tags":"python,jquery,django,forms,twitter-bootstrap","A_Id":60387291,"CreationDate":"2020-02-25T03:32:00.000","Title":"What is the best way to implement Django 3 Modal forms?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on a project written in python and using django to build a website as well. I have a function which is pulling the information from a website and putting that information into a dictionary. When the users refresh the browser, the website will show the latest update of that dictionary, so far I am doing the updates being triggered by the browser but this is only for testing.\nSo, after several headaches I could finally install celery and make it work, so I have my website running with \"python manage.py runserver\", and at the same time I have two celery processes running: \"celery -A tasks worker -l info pool=solo\" and \"celery -A tasks beat --loglevel=info\". So far everything seems to be working until I realized that the dictionary is being updated but not for all users who access the website, looks like each user has his own instance of the dictionary. \nSo the idea is to have celery updating the dictionary with the information pulled from the website and all users just seeing what is inside the dictionary variable. Can I do this without a database or a file being written every time the update function is called?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":75,"Q_Id":60399772,"Users Score":0,"Answer":"Coming back on this, it seems my problem was Celery. Looks like Celery was running its own instance of my program when I ran the commands mentioned above. Then when I started the webserver using \"python manager.py runserver\" that had nothing to do with celery tasks. I stopped using celery and now I am using a background scheduler for doing the same, everything works now.","Q_Score":0,"Tags":"python,django,celery","A_Id":60460825,"CreationDate":"2020-02-25T17:02:00.000","Title":"Python Django - Variables shared between multiple users","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'd like to access the database configured in the setting via a shell command in Flask. Is there any equivalent command in Flask to python manage.py dbshell in Django?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":361,"Q_Id":60405637,"Users Score":0,"Answer":"No there is no such command exists for flask , but you can access your db with normal db clients","Q_Score":0,"Tags":"python,database,flask","A_Id":60406419,"CreationDate":"2020-02-26T01:45:00.000","Title":"Shell command to access db in Flask","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a table named tableA with columns \"name\" and \"age\" built using model.py. \nNow I wanted to add another column like \"gender\" but this time not by changing model.py but directly through admin panel.\nI know that admin panel allows to add values to the existing table but i wanted to add a feature where we can add columns too through the admin panel and not by hardcoding in model.py\nSo is it possible?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":387,"Q_Id":60408667,"Users Score":0,"Answer":"Actually you can create a view, which one connects to DB and you can write there a creating of any column for this table using raw SQL. \nBut it's an awful way. In future, you will get an enormous count of different troubles. \nI'd better say: it's not possible.","Q_Score":0,"Tags":"python,django,admin","A_Id":60409826,"CreationDate":"2020-02-26T07:19:00.000","Title":"How to add columns through django admin panel","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a table field with entries such as e.g. 02-65-04-12-88-55.\nEach position (separated by -) represents something. (There is no '-' in the database, that's how it's displayed to the user).\nUsers would like to search by the entry's specific position. I am trying to create a queryset to do this but cannot figure it out. I could handle startswith, endswith but the rest - I have no idea.\nOther thoughs would be to split the string at '-' and then query at each specific part of the field (if this is possible).\nHow can a user search the field's entry at say positions 0-1, 6-7, 10-11 and have the rest wildcarded and returned?\nIs this possible? I may be approaching this wrong? Thoughts?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":209,"Q_Id":60412412,"Users Score":0,"Answer":"You could use a something__like='__-__-__-__-88-__' query, but it's likely to not be very efficient (since the database will have to scan through all rows to find a match).\nIf you need to lots of these queries, it'd be better to split these out to actual fields (something_1, something_2, etc.)","Q_Score":0,"Tags":"python,django,django-queryset","A_Id":60412471,"CreationDate":"2020-02-26T11:00:00.000","Title":"Django Queryset - Can I query at specific positions in a string for a field?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"It seems like all ok for desktop interface but doesn't work correctly for mobile devices. This trouble is appear only when i put my custom base.html.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":29,"Q_Id":60412574,"Users Score":0,"Answer":"try clearing you browser cache by CONT + Shift + R\nit is some time your browser cache problem that your admin interface didn't load correctly.","Q_Score":1,"Tags":"python,django,django-forms,django-templates,django-admin","A_Id":60412707,"CreationDate":"2020-02-26T11:09:00.000","Title":"Why when i overriding base.html django-admin has been disable responsive interface?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How could I or would it be appropriate to integrate Python code with HTML\/CSS\/JS as the user interface in creating desktop applications. A simple example; if I wanted to created a function with Python that prints \"Hello World!\" and use HTML\/CSS\/JS to create a user interface (make it fancy, perhaps add some images), so I can use it as a desktop application. How would I go about this?\nI understand I could use libraries such as Tkinter, but it doesn't allow the flexibility of customising user interface. \nI've read about using Electron, but I haven't seen many people using Python as the back-end. Any help or information in relation to using Python as a back-end with HTML\/CSS\/JS as the user interface will be greatly appreciated.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1975,"Q_Id":60426276,"Users Score":0,"Answer":"Yes you can. You need to choose framework of python. like Django etc. Then you can make own desktop application as you can.","Q_Score":1,"Tags":"javascript,python,html,css,user-interface","A_Id":60426303,"CreationDate":"2020-02-27T04:31:00.000","Title":"Integrating Python back-end with HTML\/CSS\/JS User Interface for desktop applications?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How could I or would it be appropriate to integrate Python code with HTML\/CSS\/JS as the user interface in creating desktop applications. A simple example; if I wanted to created a function with Python that prints \"Hello World!\" and use HTML\/CSS\/JS to create a user interface (make it fancy, perhaps add some images), so I can use it as a desktop application. How would I go about this?\nI understand I could use libraries such as Tkinter, but it doesn't allow the flexibility of customising user interface. \nI've read about using Electron, but I haven't seen many people using Python as the back-end. Any help or information in relation to using Python as a back-end with HTML\/CSS\/JS as the user interface will be greatly appreciated.","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":1975,"Q_Id":60426276,"Users Score":2,"Answer":"You're best option is to look at Flask (Almost no learning curve) as a backend and you can continue using HTML\/CSS\/JS as frontend. \nHowever to create a desktop application you will need to integrate (Your frontend) with tools like electron.","Q_Score":1,"Tags":"javascript,python,html,css,user-interface","A_Id":60426336,"CreationDate":"2020-02-27T04:31:00.000","Title":"Integrating Python back-end with HTML\/CSS\/JS User Interface for desktop applications?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using inclusion tag in sidebar of html page. If I hide the sidebar using css for mobile view. Will Django process the inclusion tag in backend when visited from mobile","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":84,"Q_Id":60434559,"Users Score":0,"Answer":"Yes it will process and include it. But if your css hides it it wont be displayed. \nYou can use developer tools (Inspect) in your browser to see the included code.","Q_Score":0,"Tags":"python,css,django","A_Id":60434620,"CreationDate":"2020-02-27T13:39:00.000","Title":"Will Django process inclusion tag if I hide it in html template using css","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Machine learning module which uses Google Colab's free GPU for NLP tasks, and I want to make a web app out of it. I've been thinking of using React js for frontend and spring boot for the back end and was wondering whether there is a way to connect the code at Google Colab with the backend.\nWant to know other alternative suggestions to building a web app incorporating the ML module in Colab as well. Any sort of help is appriciated.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":2835,"Q_Id":60443948,"Users Score":1,"Answer":"It's possible. But there's no good examples of it.\nThere's an example of serving local resources, using http-server. Flask examples used to work too. But not much else.","Q_Score":2,"Tags":"python,api,machine-learning,nlp,google-colaboratory","A_Id":60452454,"CreationDate":"2020-02-28T01:10:00.000","Title":"Is there a way to turn Google Colab code into web services or rest APIs","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on odoo11. I want to redirect to Invoicing menu from Odoo website on button click. How can I achieve it through code?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":246,"Q_Id":60446222,"Users Score":0,"Answer":"You can use controller to redirect website page to backend but make sure on your controller you use auth=user for security reason so public user can not go to backend.","Q_Score":0,"Tags":"python-3.x,odoo,odoo-11","A_Id":60969021,"CreationDate":"2020-02-28T06:15:00.000","Title":"How to redirect to invoice menu from Odoo website?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working on a django project that requires me to import code from another package. For exmaple, in my \"home\" app, I'm import from the \"users\" app. In my index.py view in the home app, I'm using from project.users import services. Running this from a python shell works fine, however, if I try to run python3 manage.py runserver, I get the error ModuleNotFoundError: No module named 'project.users'. I tried adding my project directory and its parent to my sys.path, however, nothing changes. I also tried using a different machine and a venv with no success. How would I be able to fix this?\nEdit: I also tried running from project.users import services from the django shell (python3 manage.py shell) and I get the same import error.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":722,"Q_Id":60460033,"Users Score":1,"Answer":"I solved the problem by changing my imports from from project.users import services to from users.import services.\nAlso, to fix the red underlines in pycharm, just mark your project root (\"project\" folder in my example) as sources root (Right click > Mark directory as.. > Sources root). \n(@BearBrown's answer, credit to him)","Q_Score":2,"Tags":"python,django,python-3.x,importerror","A_Id":60460427,"CreationDate":"2020-02-28T22:25:00.000","Title":"Can't import top level packages in django project","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created two DocTypes inside the education module. I've unchecked the \"custom\" checkbox to build the js and py files. However, the two DocTypes have not listed inside the education module. \nIf I check the custom they return to list under setup so how I can list him inside the education module while the custom is unchecked?\nanother question: I have created a custom script for one of these DocTypes, will I lose the script after unchecked custom !!!\nNote: I can find them in the global search","AnswerCount":2,"Available Count":1,"Score":-0.0996679946,"is_accepted":false,"ViewCount":392,"Q_Id":60464004,"Users Score":-1,"Answer":"Try Bench Migrate First for Standard DocType","Q_Score":0,"Tags":"python,doctype,erpnext,frappe","A_Id":60703541,"CreationDate":"2020-02-29T10:14:00.000","Title":"DocType not visible under Module view","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to process images(most probably in big sizes) on Hadoop platform but I am confused about which one to choose from the aforementioned 2 interfaces, especially for someone who is still a beginner in Hadoop. Considering the need to split the images into blocks to distribute processing among working machines and merge the blocks after processing is completed.\nIt's known that Pydoop has better access to the Hadoop API while mrjob has powerful utilities for executing the jobs, which one is suitable to be used with this kind of work?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":121,"Q_Id":60469567,"Users Score":1,"Answer":"I would actually suggest pyspark because it natively supports binary files.\nFor image processing, you can try TensorFlowOnSpark","Q_Score":0,"Tags":"python,hadoop,image-processing","A_Id":60476719,"CreationDate":"2020-02-29T21:00:00.000","Title":"Pydoop vs Mrjob for image processing on Hadoop","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am learning to use django and my question is if it is possible to change the system to reset the users' password, the default system of sending a link by mail I do not want to use it, my idea is to send a code to reset the password , but I don't know how it should be done and if possible, I would also need to know if it's safe.\nWhat I want is for the user who wants to recover his password to go to the recovery section, fill in his email and choose to send and enable a field to put the code that was sent to the mail.\nI don't know how I should do it or is there a package for this?\nThank you very much people greetings.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":42,"Q_Id":60519088,"Users Score":0,"Answer":"You can do this, when user clicks on reset password ask for users email id, verify that email id provided is same as what you have in DB. If the email id matches you can generate a OTP and save it in DB(for specific time duration like 3 mins) and send it to user's Email id. Now User enters the OTP. If the OTP provided by user matches the one you have in DB, open the page where user can enter new password.","Q_Score":0,"Tags":"python,django","A_Id":60519448,"CreationDate":"2020-03-04T04:29:00.000","Title":"How to change resetting password of django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Context\nHey I am developing an android app that can detect objects of 5 classes. I used SSD mobilenet architecture for transfer learning to train the model on my own dataset. In the python code I was able to generate the inference quite well but when it came to integrating the model with app, everything went to hell and I failed miserably.\nStrategy\nSo in order to use the model, I came up with an idea to host the model on a cloud server and whenever I take an image from android app camera, It sends the image to the cloud, performs the inference and returns the result back to android app.\nResearch done so far...\nSo far I have researched about REST APIs, specifically Retrofit which help communication b\/w client and server using HTTP protocol. Its CRUD architecture and the GET, POST, PUT and DELETE methods.\nMain Question\nSo before I get lost and fail miserably again like I did with trying to integrate tflite with android, I need a solid answer that if it is even possible, and if it is guide me in the right direction so that I don't get stuck again. basically I just need to understand the steps involved in this approach.\nYour help will be greatly appreciated.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":38,"Q_Id":60550098,"Users Score":1,"Answer":"Having a cloud endpoint to take a picture from your android app as input and give back inference results to the phone is what you are looking for. Amazon and Google cloud solutions let you run inference for each api call you make and they charge you for each api call.","Q_Score":0,"Tags":"python,android,cloud,retrofit,object-detection","A_Id":60586858,"CreationDate":"2020-03-05T16:35:00.000","Title":"Is it possible to host an object detection model on cloud, generate inference and retrieve results back to Android app","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to write to an SQS Queue that I create in the same SAM template as my lambda. To send a message to the queue I need the URL. \nclient.send_message(QueueUrl='string', MessageBody='string', ...)\nI can get the URL if I have the name of the queue (client.get_queue_url(QueueName='string', QueueOwnerAWSAccountId='string')), but this is randomly generated when deployed by SAM. For a Function you can specify FunctionName in the template.yaml, but I haven't found an example of this for a Queue. \nI know that in the template.yaml I can use !Ref MyQueue but I don't know of an equivalent to use in the lambda. I assume there is a trick, I just don't know that trick :)","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":310,"Q_Id":60550330,"Users Score":1,"Answer":"You can pass in the queue URL as an environment variable to the lambda. That allows you use the !Ref MyQueue in the template to reference the queue. Just add that to the Environment -> Variables section of the lambda configuration.","Q_Score":1,"Tags":"python,aws-lambda,aws-serverless","A_Id":60551023,"CreationDate":"2020-03-05T16:48:00.000","Title":"How to reference an AWS resource created via SAM in a Lambda?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a AWS lambda function running some code and then saving a json to a s3 bucket.\nCurrently, my formatting is using the datetime package to grab the current date.\nnow = str(datetime.today())\nI am then formatting the csv to \n'payrollcompensation_streams\/{}_{}.json'.format('pega_payrollcompensation_raw',now))\nWhat I want to do is everytime this AWS Lambda function runs generate an unique key of an integer instead of a datetime.\nInstead of this: pega_payrollcompensation_raw_2020-03-05 00:00:00.0000\nThis: pega_payrollcompensation_raw_1\nThen the next time\npega_payrollcompensation_raw_2","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":178,"Q_Id":60554992,"Users Score":1,"Answer":"In case of using Lambda for this task you need to save state somewhere. Best fit for your case is DynamoDB. You need to set some sort of counter there and receive value from counter  first. Be careful with concurrency.","Q_Score":0,"Tags":"python,amazon-web-services,aws-lambda","A_Id":60555255,"CreationDate":"2020-03-05T22:38:00.000","Title":"AWS Lambda: Unique Key generator for s3 files","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm new with python and Django. I know a lot about the Codeigniter framework and there if you want to create a project like an eCommerce you must create an admin panel with template and function for the backend. when I was creating backend I was adding functions for the admin panel where all functions were for adding some informations in the database. so when I start with Django I saw that there was an integrated admin panel which can be modified but I have a question can I create app for Django which will be admin panel of my project","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":73,"Q_Id":60558267,"Users Score":0,"Answer":"Yes, definitely man. Django provides its own admin panel and it is really very helpful, you can customize it also as per yours need.\nBut if you want to make your own admin panel then you can do it. You can create a separate app for that. And then you have to manage templates as per your admin panel design and apply all functionality in views.py. And all URLs which will be used for the admin panel, should be mentioned in urls.py.","Q_Score":0,"Tags":"python,django,python-3.x,django-admin,django-3.0","A_Id":60558403,"CreationDate":"2020-03-06T05:48:00.000","Title":"please give me advice with django admin","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to make four drop down button(like country state city and location)each field we want to make it based on the selection like when country select its state related to country we get and when state is s selected then city related to these state gets populated when city get slelected then its loctation related to these city we get","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":24,"Q_Id":60558402,"Users Score":0,"Answer":"One of approach you can take is :\n\nUser go to page\nBack End get the list of country and pass it to front end\nUser select 1 country from drop-down\nFront end java-script use ajax call to pass country to back-end and get all states\nFront end show all states in second drop-down\nUser select 1 state from drop-down \nFront end java-script use ajax call to pass state to back-end and get all district\nFront end show all district in third drop-down\n\nbut this kind of slow, so choose wisly","Q_Score":0,"Tags":"python,django,dropdown","A_Id":60558638,"CreationDate":"2020-03-06T06:02:00.000","Title":"delendent dropdown in django(DJango,Python)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"i have one AWS Batch-Job which is working fine, the scenario is when we want to run the Job we are submitting Batch-Job using python BOTO3 SDK.\nNow I want to schedule the Batch-Job in which I can specify the time and it needs to submit Batch-Job on the specified time. I'm using cloud watch right now but, I want to specify some parameters while submitting the Batch-Job. \nAny one have idea about any AWS service where i can make schedule event with some parameter and it need to submit Batch-Job with those parameter as a environment variable.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":173,"Q_Id":60558674,"Users Score":0,"Answer":"You could use a Lambda function. You can set up a Lambda function on a schedule, and it can use boto3 to submit a Batch job with the necessary parameters.","Q_Score":0,"Tags":"python-2.7,amazon-web-services,amazon-cloudwatch,aws-batch","A_Id":61377131,"CreationDate":"2020-03-06T06:29:00.000","Title":"AWS Schedule Batch-Job via Boto3 SDK with pass some environment variable","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I couldn't install Scrapy on my system after I upgraded pip to 20.0.2.\nAnd what file do I have to install manually in order to make it work?\nPlease help me out.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":471,"Q_Id":60559095,"Users Score":1,"Answer":"sudo apt-get install python3 python3-dev python3-pip libxml2-dev libxslt1-dev zlib1g-dev libffi-dev libssl-dev","Q_Score":1,"Tags":"python,git,scrapy","A_Id":60562015,"CreationDate":"2020-03-06T07:05:00.000","Title":"Failed building wheel for cryptography. Could not build wheels for cryptography which use PEP 517 and cannot be installed directly","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to running the appserver with python manage.py runserver with python 3.8.2 and django 3.0.3. I've setup a mysql database connection and inserted my \"myApp.apps.myAppConfig\" into INSTALLED_APPS, declared a couple of database-view based models, a form and a view. Nothing that seems too out of the way for the tutorials i've found. When i run the python manage.py runserver command, this is the output:\n\nWatching for file changes with StatReloader Performing system\n  checks...\nException in thread django-main-thread: Traceback (most recent call\n  last):   File\n  \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\apps\\registry.py\",\n  line 155, in get_app_config\n      return self.app_configs[app_label] KeyError: 'admin'\nDuring handling of the above exception, another exception occurred:\nTraceback (most recent call last):   File\n  \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\threading.py\",\n  line 932, in _bootstrap_inner\n      self.run()   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\threading.py\",\n  line 870, in run\n      self._target(*self._args, **self._kwargs)   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\utils\\autoreload.py\",\n  line 53, in wrapper\n      fn(*args, **kwargs)   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\core\\management\\commands\\runserver.py\",\n  line 117, in inner_run\n      self.check(display_num_errors=True)   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\core\\management\\base.py\",\n  line 392, in check\n      all_issues = self._run_checks(   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\core\\management\\base.py\",\n  line 382, in _run_checks\n      return checks.run_checks(**kwargs)   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\core\\checks\\registry.py\",\n  line 72, in run_checks\n      new_errors = check(app_configs=app_configs)   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\core\\checks\\urls.py\",\n  line 13, in check_url_config\n      return check_resolver(resolver)   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\core\\checks\\urls.py\",\n  line 23, in check_resolver\n      return check_method()   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\urls\\resolvers.py\",\n  line 407, in check\n      for pattern in self.url_patterns:   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\utils\\functional.py\",\n  line 48, in get\n      res = instance.dict[self.name] = self.func(instance)   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\urls\\resolvers.py\",\n  line 588, in url_patterns\n      patterns = getattr(self.urlconf_module, \"urlpatterns\", self.urlconf_module)   File\n  \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\utils\\functional.py\",\n  line 48, in get\n      res = instance.dict[self.name] = self.func(instance)   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\urls\\resolvers.py\",\n  line 581, in urlconf_module\n      return import_module(self.urlconf_name)   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\importlib__init__.py\",\n  line 127, in import_module\n      return _bootstrap._gcd_import(name[level:], package, level)   File \"\", line 1014, in _gcd_import   File\n  \"\", line 991, in _find_and_load   File\n  \"\", line 975, in _find_and_load_unlocked \n  File \"\", line 671, in _load_unlocked\n  File \"\", line 783, in\n  exec_module   File \"\", line 219, in\n  _call_with_frames_removed   File \"C:\\Users\\celli\\Desktop\\Interventi Comuni\\Python\\django-projects\\zabbixPyFace\\zabbixPyFace\\urls.py\", line\n  21, in \n      path('admin\/', admin.site.urls),   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\utils\\functional.py\",\n  line 224, in inner\n      self._setup()   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\contrib\\admin\\sites.py\",\n  line 537, in _setup\n      AdminSiteClass = import_string(apps.get_app_config('admin').default_site)   File\n  \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\apps\\registry.py\",\n  line 162, in get_app_config\n      raise LookupError(message) LookupError: No installed app with label 'admin'.\n\nI tried searching big G for answers but there's many sources that can cause this problem, could any of you gurus provide some insight?\nUpdate:\nI've already checked the INSTALLED_APPS and django.contrib.admin is present: \nINSTALLED_APPS = [ 'django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles', # jupyter notebook plugin 'django_extensions', ]","AnswerCount":3,"Available Count":2,"Score":0.0665680765,"is_accepted":false,"ViewCount":8213,"Q_Id":60567760,"Users Score":1,"Answer":"You need to add \"django.contrib.admin\" to your INSTALLED_APPS setting.","Q_Score":0,"Tags":"python,django,python-3.x","A_Id":60567873,"CreationDate":"2020-03-06T16:07:00.000","Title":"Django LookupError: No installed app with label 'admin'","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to running the appserver with python manage.py runserver with python 3.8.2 and django 3.0.3. I've setup a mysql database connection and inserted my \"myApp.apps.myAppConfig\" into INSTALLED_APPS, declared a couple of database-view based models, a form and a view. Nothing that seems too out of the way for the tutorials i've found. When i run the python manage.py runserver command, this is the output:\n\nWatching for file changes with StatReloader Performing system\n  checks...\nException in thread django-main-thread: Traceback (most recent call\n  last):   File\n  \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\apps\\registry.py\",\n  line 155, in get_app_config\n      return self.app_configs[app_label] KeyError: 'admin'\nDuring handling of the above exception, another exception occurred:\nTraceback (most recent call last):   File\n  \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\threading.py\",\n  line 932, in _bootstrap_inner\n      self.run()   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\threading.py\",\n  line 870, in run\n      self._target(*self._args, **self._kwargs)   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\utils\\autoreload.py\",\n  line 53, in wrapper\n      fn(*args, **kwargs)   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\core\\management\\commands\\runserver.py\",\n  line 117, in inner_run\n      self.check(display_num_errors=True)   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\core\\management\\base.py\",\n  line 392, in check\n      all_issues = self._run_checks(   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\core\\management\\base.py\",\n  line 382, in _run_checks\n      return checks.run_checks(**kwargs)   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\core\\checks\\registry.py\",\n  line 72, in run_checks\n      new_errors = check(app_configs=app_configs)   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\core\\checks\\urls.py\",\n  line 13, in check_url_config\n      return check_resolver(resolver)   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\core\\checks\\urls.py\",\n  line 23, in check_resolver\n      return check_method()   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\urls\\resolvers.py\",\n  line 407, in check\n      for pattern in self.url_patterns:   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\utils\\functional.py\",\n  line 48, in get\n      res = instance.dict[self.name] = self.func(instance)   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\urls\\resolvers.py\",\n  line 588, in url_patterns\n      patterns = getattr(self.urlconf_module, \"urlpatterns\", self.urlconf_module)   File\n  \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\utils\\functional.py\",\n  line 48, in get\n      res = instance.dict[self.name] = self.func(instance)   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\urls\\resolvers.py\",\n  line 581, in urlconf_module\n      return import_module(self.urlconf_name)   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\importlib__init__.py\",\n  line 127, in import_module\n      return _bootstrap._gcd_import(name[level:], package, level)   File \"\", line 1014, in _gcd_import   File\n  \"\", line 991, in _find_and_load   File\n  \"\", line 975, in _find_and_load_unlocked \n  File \"\", line 671, in _load_unlocked\n  File \"\", line 783, in\n  exec_module   File \"\", line 219, in\n  _call_with_frames_removed   File \"C:\\Users\\celli\\Desktop\\Interventi Comuni\\Python\\django-projects\\zabbixPyFace\\zabbixPyFace\\urls.py\", line\n  21, in \n      path('admin\/', admin.site.urls),   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\utils\\functional.py\",\n  line 224, in inner\n      self._setup()   File \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\contrib\\admin\\sites.py\",\n  line 537, in _setup\n      AdminSiteClass = import_string(apps.get_app_config('admin').default_site)   File\n  \"C:\\Users\\celli\\AppData\\Local\\Programs\\Python\\Python38\\lib\\site-packages\\django\\apps\\registry.py\",\n  line 162, in get_app_config\n      raise LookupError(message) LookupError: No installed app with label 'admin'.\n\nI tried searching big G for answers but there's many sources that can cause this problem, could any of you gurus provide some insight?\nUpdate:\nI've already checked the INSTALLED_APPS and django.contrib.admin is present: \nINSTALLED_APPS = [ 'django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles', # jupyter notebook plugin 'django_extensions', ]","AnswerCount":3,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":8213,"Q_Id":60567760,"Users Score":3,"Answer":"Answering my own question, searching the net for informations regarding this error leads to many ambigous results, since this error seems to be fired even if the root cause was of another nature. In my case i forgot to apply the python manage.py makemigrations directive.","Q_Score":0,"Tags":"python,django,python-3.x","A_Id":60576410,"CreationDate":"2020-03-06T16:07:00.000","Title":"Django LookupError: No installed app with label 'admin'","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a django app running in a docker container. I bashed into the container and used python manage.py startapp. However, the created directories and files appear to be read-only. From within intellij, I am unable to edit the files. I get a popup offering to clear the readonly status, but that just gives me an error unable to clear readonly status on the following files. \nHow can I edit my files outside of the container?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":427,"Q_Id":60570483,"Users Score":2,"Answer":"You are probably running your container as root user. Hence you do not have the permission to edit them via your editor.\nTry running your container with a regular user (for example docker run  --user 1000:1000 whatever-you-need).","Q_Score":0,"Tags":"python,django,docker","A_Id":60571741,"CreationDate":"2020-03-06T19:32:00.000","Title":"manage.py startapp creates read-only files from within docker","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am writing an application which extracts some data from HTML using BeautifoulSoup4. These are search results of some kind, to be more specific. I thought it would be a good a idea to have a Parser class, storing default values like URL prefixes, request headers etc. After configuring those parameters, the public method would return a list of objects, each of them containing a single result or maybe even an object with a list composed into it alongside with some other parameters. I'm struggling to decouple small pieces of logic that build that parser implementation from the parser class itself. I want to write dozens of parser private utility methods like: _is_next_page_available, _are_there_any_results, _is_did_you_mean_available etc. However, these are the perfect candidates for writing unit tests! And since I want to make them private, I have a feeling that I'm missing something...\nMy other idea was to write that parser as a function, calling bunch of other utility functions, but that would be just equal to making all of those methods public, which doesn't make sense, since they're implementation details.\nCould you please advice me how to design this properly?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":59,"Q_Id":60581669,"Users Score":2,"Answer":"I think you're interpreting the Single-Responsibility Principle (SRP) a little differently. It's actual meaning is a little off from 'a class should do only one thing'. It actually states that a class should have one and only one reason to change.\nTo employ the SRP you have to ask yourself to what\/who would your parser module methods be responsible, what\/who might make them change. If the answer for each method is the same, then your Parser class employs the SRP correctly. If there are methods that are responsible to different things (business-rule givers, groups of users etc.) then those methods should be taken out and be placed elsewhere.\nYour overall objective with the SRP is to protect your class from changes coming from different directions.","Q_Score":1,"Tags":"python,unit-testing,oop,solid-principles","A_Id":60603232,"CreationDate":"2020-03-07T19:56:00.000","Title":"How to design a HTML parser that would follow the Single Responsibility Principle?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using Django 2.2.10 for my app. I am trying to bump it up to Django 3.0.4. But it's throwing me this error:\nImportError: cannot import name 'six' from 'django.utils' (C:\\Users\\hkhatri\\Desktop\\capstone\\fitgirl-inc\\env\\lib\\site-packages\\django\\utils__init__.py)\nI already have six==1.14.0 installed. Can someone please help on how to upgrade my Django version from 2.2.10 to 3.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":400,"Q_Id":60582969,"Users Score":0,"Answer":"I haven't seen the rest of your code and not sure how you're using six but this is how I'm using six in Django 3:\n\nYou want to install Six with pip \nAdd it to your apps in settings\nThen import it in your model import six\n...six.PY3......","Q_Score":0,"Tags":"python,django,six","A_Id":61757611,"CreationDate":"2020-03-07T22:56:00.000","Title":"Django 3.0.4 compatibility with Six package","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've installed a new app thorough pip (it's called django-sitetree).\nI want to know if I can connect my models (like Category model) to this app with Foreignkey our something else?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":30,"Q_Id":60596493,"Users Score":0,"Answer":"No this django-sitetree is the module and you can not connect it with your app model to any Foreignkey.\nBecause you only give model field or model as Foreignkey.","Q_Score":0,"Tags":"python,django","A_Id":60596532,"CreationDate":"2020-03-09T07:51:00.000","Title":"Can I connect my model to an external app?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is there anyway I can list all resources\/components under a sub-net using boto-3?\nI'm unable to find a method which gives me result I'm looking for","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":74,"Q_Id":60635513,"Users Score":1,"Answer":"There is no single method that lists everything, but there are API calls to list each type of component.\nFor example, you could list EC2 instances, ENIs, Load Balancers, etc.\nActually, everything in a subnet will have an ENI associated with it, so you could start there. However, it's often not easy to determine the component that is linked to the ENI.","Q_Score":0,"Tags":"python,amazon-web-services,aws-sdk,boto3","A_Id":60646170,"CreationDate":"2020-03-11T11:58:00.000","Title":"List all components under a subnet AWS","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"The whole project is as follows:\nI'm trying to build a Django based web-app for my college library. This app when idle will be showing a slideshow of pictures on the screen. However when an input is received from the barcode scanner, it is supposed to redirect it to a different age containing information related to that barcode. I'm not able to figure out how to get an input from the scanner and only then redirect it to the page for 3 seconds containing the relevant information, after the interval, it should redirect back to the page containing the slideshow.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":182,"Q_Id":60638584,"Users Score":0,"Answer":"you should communicate with the bar-code scanner to receive scanning-done event which has nothing to do with django but only javascript or even an interface software which the user must install, like a driver, so you can detect the bar-code scanner from javascript(web browser) then you can get your event in javascript and redirect the page on the event or do whatever you want","Q_Score":2,"Tags":"python,django,redirect,image-processing,web-applications","A_Id":60640111,"CreationDate":"2020-03-11T14:39:00.000","Title":"How to redirect to a different page in Django when I receive an input from a barcode scanner?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was running into a lot of file not found for webpack in my static folder, and I later realized that for some reason this particular project (which I'm using docker with) keeps trying to check another project folder's static folder for the files I would want. I'm not sure where this could've gone wrong other than the base_dir, but I never changed that setting. There was a while I was going between the projects and trying to run each one (the other project is basically the same thing but not on docker), was that possibly what's confusing the program? How can I solve it?","AnswerCount":3,"Available Count":1,"Score":0.0665680765,"is_accepted":false,"ViewCount":613,"Q_Id":60648661,"Users Score":1,"Answer":"BASE_DIR is written in settings.py file you can use that by importing it.","Q_Score":2,"Tags":"python,django,webpack","A_Id":60648708,"CreationDate":"2020-03-12T06:27:00.000","Title":"How to check BASE_DIR in django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Both views.py and xyz.py are in app folder.But when I import xyz.py\ndjango says \"ModuleNotFound\"","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":52,"Q_Id":60672732,"Users Score":0,"Answer":"Try using from . import xyz this should fix that error","Q_Score":0,"Tags":"python,django","A_Id":60672892,"CreationDate":"2020-03-13T15:00:00.000","Title":"Windows-Django- can't import own modules-says module not found","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to define a field in my Model, which is supposed to host a valid dir path on server-side.\nBasically just a string which should be:\n1) a formally valid unix-like dir path\n2) an existing dir path\nTried with FilePathField with options allow_files=False, allow_folders=True . \nBut when I try to create a new instance of the model from the django admin CRUD, I'm getting an error claiming that the initial value of the field (which is by default an empty string) is a not existing path...\nI have a feeling this is not the right way. Maybe another field type could be more suitable? Maybe it should be just a simple string? (in this case, shall I be able to define correctly the required validators?)\nThanks for any hint,\nThomas","AnswerCount":3,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":351,"Q_Id":60674719,"Users Score":0,"Answer":"Maybe try to loop through those file-systems and specify them under a function path and also loop through the sub-paths separately, this should show u the entire subtree as it would run every single one at a time separately. I think u r hving problem because Django is not running all the possible sub-file-systems.\nHope that helps","Q_Score":0,"Tags":"python,django,django-admin,django-model-field","A_Id":60683256,"CreationDate":"2020-03-13T17:16:00.000","Title":"Django - Which model field for dir path?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to define a field in my Model, which is supposed to host a valid dir path on server-side.\nBasically just a string which should be:\n1) a formally valid unix-like dir path\n2) an existing dir path\nTried with FilePathField with options allow_files=False, allow_folders=True . \nBut when I try to create a new instance of the model from the django admin CRUD, I'm getting an error claiming that the initial value of the field (which is by default an empty string) is a not existing path...\nI have a feeling this is not the right way. Maybe another field type could be more suitable? Maybe it should be just a simple string? (in this case, shall I be able to define correctly the required validators?)\nThanks for any hint,\nThomas","AnswerCount":3,"Available Count":3,"Score":1.2,"is_accepted":true,"ViewCount":351,"Q_Id":60674719,"Users Score":0,"Answer":"After some tests, I realized this model field type actually is used for fields which are assigned a value by browsing among files\/dirs that already exist in the filesystem. Hence, the error was due to the path parameter I used (which I chose randomly) that didn't exist in the filesystem.\nHowever, this Model field still fits my purposes, because having to choose a directory that already exists, certainly forces the user to assign a value which satisfies both validation points above mentioned.\nThere is even the possibility to make a \"deep browsing\", by including the entire sub dir tree. Just use the recursive=True  option.\nSo\nrepository = models.FilePathField(\"repo_root\/\", allow_files=False, allow_folders=True, recursive=True)\nwill do the trick.\nFor sub trees with many directories the page might become unresponsive.\nThomas","Q_Score":0,"Tags":"python,django,django-admin,django-model-field","A_Id":60678042,"CreationDate":"2020-03-13T17:16:00.000","Title":"Django - Which model field for dir path?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to define a field in my Model, which is supposed to host a valid dir path on server-side.\nBasically just a string which should be:\n1) a formally valid unix-like dir path\n2) an existing dir path\nTried with FilePathField with options allow_files=False, allow_folders=True . \nBut when I try to create a new instance of the model from the django admin CRUD, I'm getting an error claiming that the initial value of the field (which is by default an empty string) is a not existing path...\nI have a feeling this is not the right way. Maybe another field type could be more suitable? Maybe it should be just a simple string? (in this case, shall I be able to define correctly the required validators?)\nThanks for any hint,\nThomas","AnswerCount":3,"Available Count":3,"Score":0.0,"is_accepted":false,"ViewCount":351,"Q_Id":60674719,"Users Score":0,"Answer":"try saving the path(the string) in a dictionary first as it is a path, then saving it in the server as a dictionary it would work and would be a whole lot easier.","Q_Score":0,"Tags":"python,django,django-admin,django-model-field","A_Id":60675416,"CreationDate":"2020-03-13T17:16:00.000","Title":"Django - Which model field for dir path?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to integrate Stripe into a Django project and I noticed that there's a stripe-python package. This runs entirely synchronously though. Is it a bad idea to make these types of call from the main web server? Since it makes external calls, this presumably means the webserver will be blocked while we wait for a response, which seems bad.\nSo, should I be running this from something like Celery? Or is it fine to run on the main thread?  Anyone have experience with this?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":269,"Q_Id":60678409,"Users Score":1,"Answer":"Based on a previous project, I think using it synchronously is much better from a design prospective. WIth most payments, you want to keep the user on the page until the payment goes through so they know for certain that there was no issue with the payment and you can handle any issues with the payment right there rather than taking the task from the queue and handling it. If you think about most payments you have done online, these all are happening in the main thread for this reason","Q_Score":2,"Tags":"python,django,stripe-payments","A_Id":60710043,"CreationDate":"2020-03-13T23:32:00.000","Title":"stripe-python, should it be async?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have read lots of documentation and articles about using signals in Django, but I cannot understand the concept.  \n\nWhat is the purpose of using signals in Django?\nHow does it work?\n\nPlease explain the concept of signals and how to use it in Django code.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":406,"Q_Id":60679719,"Users Score":2,"Answer":"The Django Signals is a strategy to allow decoupled applications to get notified when certain events occur. Let\u2019s say you want to invalidate a cached page everytime a given model instance is updated, but there are several places in your code base that this model can be updated. You can do that using signals, hooking some pieces of code to be executed everytime this specific model\u2019s save method is trigged.\nAnother common use case is when you have extended the Custom Django User by using the Profile strategy through a one-to-one relationship. What we usually do is use a \u201csignal dispatcher\u201d to listen for the User\u2019s post_save event to also update the Profile instance as well.","Q_Score":2,"Tags":"django,python-3.x,django-models,django-signals","A_Id":60679829,"CreationDate":"2020-03-14T04:25:00.000","Title":"Why use signals in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"QUESTION DELETED.QUESTION DELETED.QUESTION DELETED.QUESTION DELETED.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":40,"Q_Id":60698227,"Users Score":0,"Answer":"Another thing: Since your'e using a list view, you might want to post a portion of your template code here in your question. As a list view, you have to ensure that you're properly looping through the object you're sending to the template as context.\nIs everything else showing up in your template rendering as you intend? Is it just the image that isn't showing properly?","Q_Score":0,"Tags":"python,django,django-models","A_Id":60698325,"CreationDate":"2020-03-15T22:17:00.000","Title":"Django load an imageField in a template","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a button that generates a report in two variables: one has a short version of the information and the other contains a detailed version on it.\nThe view renders the information of the short one with a template, let's call it template one. I need to place a button in template one that allows to see the content of the second variable in a different template and also in a new browser tab.\nSince the information is not stored in the database (so I cant' address it with ids) how can I pass the variable that contains the detailed report information (hundreds of rows)?\nIs it okay to try to pass it using the template tag 'url'...? (It feels like a wrong approach)","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":86,"Q_Id":60703115,"Users Score":1,"Answer":"I think your challenge will be in storing the data client-side until the client wants to view it. There are plenty of ways to do this with Javascript (Vue JS is a good option), but you'll have to get creative if you're trying to do it completely in a template. I can think of a few of options:\n\nAvoid a Second Template: Would it be possible for you to populate a hidden DIV element with the second set of data, then simply have a button to toggle the visibility of that DIV? That would be the easiest, but perhaps it would not look nice for what you want to achieve. If you use Bootstrap to make your template highly responsive, you can certainly achieve this.\nI'm not sure where your data is coming from, but it might be simpler to just re-compute in Python to generate the second template. Unless the data is in the megabytes, your client likely won't notice a huge lag, especially if it's opening into a new tab.\nAPI - If you aren't already using Django Rest Framework, it will add a whole other layer of complication to the project. However, this will allow you to get far more creative with how you display your information. You can always take a hybrid approach where most of your stuff is still rendered by Django, then build a few API endpoints for that stuff which really needs them.\n\nI'm quite the novice at Python, Django, Javascript, Postgres, and Vue JS, but by learning just enough about each of them I can see how I'll be able to accomplish most of my design goals, even if I have to constantly look up the code. I love how straight-forward Django's templates are, but when I shifted to DRF and Vue, I gained far more flexibility (albeit with far more complexity).","Q_Score":0,"Tags":"python,django","A_Id":60703646,"CreationDate":"2020-03-16T09:11:00.000","Title":"How to render the content of a variable in a different template with Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I currently have a python script that updates certain CSV files when ran (it web scrapes and updates the information of a CSV file). In my HTML page (index.html), I have a script tag inside index.html that reads the CSV file and displays it as a table on the webpage. However, what I now need to do is update the CSV file by pressing an HTML button on the webpage. This will update the CSV file so when I run the button to run the JS script, it will have updated values from the file.\nI searched and found it very hard to understand what they meant by using flask and Django (I don't know anything about setting up servers). I don't want to set up a Django webpage because I want to work with my current pure HTML webpage I wrote.\nI would appreciate it if the answer is up to date with the current standard solutions for running python scripts in HTML.\nPlease ask if you need more information. Thanks.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":581,"Q_Id":60712353,"Users Score":0,"Answer":"You can't run python in html. You can just use javascript. but you can pass the information as json and then use javascript if you don't want to change the language or using python frameworks.","Q_Score":0,"Tags":"javascript,python,html,django","A_Id":60712434,"CreationDate":"2020-03-16T19:49:00.000","Title":"How to run a python script from clicking a button on a HTML webpage?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Because of tight time constraints and good parallelization possibilities, my server backend needs to process a single query in multiple independent worker processes. To this end, I provided a set of n worker processes that communicate with the main process over multiprocessing queues. The main thread puts data into the input queue and each worker thread takes an item from it and processes it.\nFor clarification, an example: Suppose, this is a system that checks which numbers in [0, 100) are divisible by x. A user submits a number x to the REST API. Thus, the main process puts tuples (i, x) for i in range(100) into a queue. Each worker process then takes one tuple out of the queue and puts (i, i % n == 0) into the result queue. Once the main process got 100 results back, it'll respond to the user.\nAlthough this works fine on a stand-alone system, this makes problems once I put it behind a gunicorn server, namely, the information in the queues is lost and the main process hangs up. I need gunicorn because I want to make this service available via a REST API on the Web.\n(1) Is there any possibility to make this compatible with gunicorn? \nAccording to my previous research, gunicorn is incompatible with the multiprocessing module of Python. Hence, (2) are there any alternatives to the above described approach in this case?\nFor example, as an alternative, I thought about multiple independent service processes that are not spawned within the Python application, but are rather stand-alone. However, I cannot think of a simple and efficient possibility to implement that. If I'd implement another REST API for those worker processes, I'd lost a lot time with sending messages through the network stack. Thus, I'd need a more low-level approach, such as pipes or shared memory. (3) Do you have suggestions for me?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":80,"Q_Id":60732500,"Users Score":0,"Answer":"I solved this issue now by separating the Web server and the query processing into separate processes that communicate over UNIX sockets. It seems that sockets only add a tiny overhead, which is likely acceptable in this case.\nIf there is a better solution, I'm still open for further suggestions.","Q_Score":0,"Tags":"python,multithreading,rest,multiprocessing,gunicorn","A_Id":60735107,"CreationDate":"2020-03-18T01:51:00.000","Title":"Processing queries concurrently in gunicorn-powered Python Web server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am currently trying to create a website that displays a python file (that is in the same folder as the html file) on the website, but I'm not sure how to do so.\nSo I just wanted to ask if anyone could describe the process of doing so (or if its even possible at all).","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":27,"Q_Id":60741595,"Users Score":0,"Answer":"Displaying \"a python file\" and displaying \"the output\" (implied \"of a python script's execution) are totally different things. For the second one, you need to configure your server to run Python code. There are many ways to do so, but the two main options are \n1\/ plain old cgi (slow, outdated and ugly as f..k but rather easy to setup - if your hosting provides support for it at least - and possibly ok for one single script in an otherwise static site)\nand\n2\/ a modern web framework (flask comes to mind) - much cleaner, but possibly a bit overkill for one simple script.\nIn both cases you'll have to learn about the HTTP protocol.","Q_Score":0,"Tags":"python,html","A_Id":60742166,"CreationDate":"2020-03-18T14:26:00.000","Title":"Is there any way that I can insert a python file into a html page?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I would like to know if there is a way in Google Colab that can collate outputs nicely, just like Markdown in R and how IPython Notebook can be converted to pdf and html format? \nMy output consists of multiple tables, graphs etc. I would like to preferably pretty print them into one file, of which some part are presentable enough to be used in a report.If there's no such method, what is the best alternative?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":17150,"Q_Id":60748816,"Users Score":3,"Answer":"You can save \/ export an IPython notebook (menu: File \/ Download .ipynb) and then use Jupyter to save to PDF.","Q_Score":4,"Tags":"python,pandas,jupyter-notebook,google-colaboratory","A_Id":60748897,"CreationDate":"2020-03-18T23:20:00.000","Title":"Convert Google Colab notebook to PDF \/ HTML?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a flask app that has one route and nothing complex going on, running in a docker container. I cannot for the life of me get print statements to show up in the logs (docker-compose logs -f <containername>). So far, I have tried various answers that supposedly have fixed this problem for others including:\n\nCalling print(\"test\", flush=True)\nSetting PYTHONUNBUFFERED=1 and verifying it is set in the actual container with echo\nSetting PYTHONUNBUFFERED=0\nRunning python with the -u flag\nUsing the logging module (logger.warning, logger.info, etc)\n\nSo far nothing has worked. The flask app is starting perfectly fine, but no output from my print statements is shown. I have sanity checked that i'm editing the correct file by adding random syntax errors and watching the app brick itself. I'm using python 3.8 and docker-compose 2","AnswerCount":3,"Available Count":1,"Score":0.0665680765,"is_accepted":false,"ViewCount":2316,"Q_Id":60773195,"Users Score":1,"Answer":"I found this question while looking for answers to a similar problem. I was running a flask app in a conda environment in a container and wasn't getting any log output even though the flask app itself was working fine. I added the following lines to my Dockerfile and it starting logging as expected -\nENV PYTHONUNBUFFERED=1\nRUN echo \"source activate my_env\" > ~\/.bashrc\nENV PATH \/opt\/conda\/envs\/my_env\/bin:$PATH\nCMD [\"python\", \"api.py\"]","Q_Score":1,"Tags":"python,docker,flask","A_Id":64772818,"CreationDate":"2020-03-20T11:23:00.000","Title":"Docker-compose flask app not printing output from 'print'","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a live Django website I need to make changes on and I want to know what's the best \/ most correct way of updating the code of the website, I have access to the remote server and access to the git.\nThanks in advance!!!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":165,"Q_Id":60789293,"Users Score":2,"Answer":"I would recommend that you keep an updated git repository of your project on GitHub and commit to it often. \nThen, when you are ready to publish your changes, pull your git repository down to your remote server. GitHub also allows you to keep a private repository for free now so no need to worry about confidentiality.","Q_Score":1,"Tags":"python,html,django,server,mapbox","A_Id":60789457,"CreationDate":"2020-03-21T14:56:00.000","Title":"How do I make changes on a live Django website?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm currently learning Django using python. I'm using the Django website as my reference and there is one line of code that I am supposed to enter \" python manage.py migrate'. I'm wondering what does migrate means and what does it do?\nThank You!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":47,"Q_Id":60789772,"Users Score":0,"Answer":"Essentially, it syncs changes you make to the Database.  When you are just starting out on a project, you will need to enter \"python manage.py migrate\" to initially create the DB.  Later, when you add models and update them, you will need to push these changes to your DB and \"python manage.py migrate\" will do the trick.  Although you will need to enter \"python manage.py makemigrations\" first to get ready for the DB changes.","Q_Score":0,"Tags":"python,django,pycharm","A_Id":60790049,"CreationDate":"2020-03-21T15:38:00.000","Title":"What does migrate mean in django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I\u2019m interested in and researching how to build an indeed bot that applies to applications for me as well as all the other application job sites. so I can work a lot smarter and have more leads and clients coming in.\nI want to automate this process as it takes personal time to apply to each application. and I want to create a bot that goes to all the job sites for me and apply for me.\nsuch as:\nIndeed\nGlassdoor\nMonster\nLinkedin\netc\u2026\nI see there is a lot of great web developers and coders in this forum. and I know you guys have the skills and knowledge to give amazing information on this subject!\nHow should I go about doing this?\nHow do I get started on this project?\nWhat are the steps I need to make to make this happen?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":212,"Q_Id":60801161,"Users Score":0,"Answer":"The only other recommendation I can make would be to pick a tool set (e.g., a programming language, database, operating system) and ask specific questions about those around a bit more detail about how you would do things.  Otherwise, good work.","Q_Score":0,"Tags":"python,automation,project,build-automation","A_Id":60804048,"CreationDate":"2020-03-22T15:24:00.000","Title":"How to Build | Code an Indeed Bot to Automate Applying to Applications?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to automate a process in which a python file is uploaded to a web portal by the user(let's say the code is math formula) ,in the back-end the code in the file is computed through different input values that already exists in the back-end and the outputs of the computation will be returned on web-page of the user.?If this is possible then what will be the approach to do this? If possible can we also provide the graphical representation of the different outputs to the user?Or if not then can anyone provide any resource or references or any help that will help me to solve this problem?\n!THANKS IN ADVANCE!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":54,"Q_Id":60803694,"Users Score":0,"Answer":"In order to execute the uploaded Python file by the user you have to spawn a Python process from your backend server and pass it the name of file. Pass the arguments the the script also here. Save the output on your server and expose it to the user via a HTTP request.","Q_Score":0,"Tags":"javascript,python-3.x,frontend,backend,server-side-rendering","A_Id":60805204,"CreationDate":"2020-03-22T19:01:00.000","Title":"How to Automate the process of reading code, computing it and providing the output on web page to the user?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a relatively large queryset and i want to export it into excel file i was useing the XLWT library and django streaming response with csv file.\nwhen i export very large queryset of a table in sqldeveloper or navicat, the export operation is very fast but django's libraries is relatively slow. i think the excel write by row and column, or csv streaming response, write row by row in file but i looking for a way to write whole of queryset to excel.\nis there a way to export whole of queryset to excel in python django?\nSomething that comes to my mind is call os command in python code to run export command in database but i not tested it.\nthanks everybody","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":320,"Q_Id":60803795,"Users Score":0,"Answer":"I should have used pandas.\nadjust and add my queryset in data frame and to_excel or to_csv.\nthanks anyway","Q_Score":0,"Tags":"python,django,excel","A_Id":60824753,"CreationDate":"2020-03-22T19:13:00.000","Title":"django export large excel queryset","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Hi so I'm new with running an open source project. Currently, I want to let other people contribute to my project, but I'm running into a problem right now. How would I share my environment variables which other users to make sure that their app runs locally. Is there a way to have contributors run my project locally without having all of their environment variables configured? I thought of having the person make their own environment variables, but since I have quite a bit of environment variables, I would like to avoid that. \nNote: I'm running a Flask App for my backend.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":164,"Q_Id":60807171,"Users Score":1,"Answer":"I generally include a \"run\" script, which is in charge of:\n\nsetting the right environment variables\ncheck the PATH for execution environment dependencies (making sure you have the right minimum version of some executable required to run your project)\nrunning the actual project.","Q_Score":3,"Tags":"python,flask,github,backend","A_Id":60808413,"CreationDate":"2020-03-23T02:18:00.000","Title":"How to share my environment variables with open source projects?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am trying to create a web server which has Django framework and I am struggling with outer world access to server. While saying outer world I am trying to say a python program that created out of Django framework and only connects it from local PC which has only Internet connection. I can't figured it out how can I do this.\nI am building this project in my local host, so I create the \"outer world python program\" outside of the project file. I think this simulation is proper.\nI am so new in this web server\/Django field. So maybe I am missing an essential part. If this happened here  I'm sorry but I need an answer and I think it is possible to do.\nThanks in advance...","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":25,"Q_Id":60819967,"Users Score":0,"Answer":"Django generated fields in database are just standard fields. The tables are named like 'applicationname'_'modelname', you are free to do requests to the database directly, without django.\nIf you want to do it through django, your outer program can request a web page from your web server, and deal with it. (You may want to take a look at RESTs frameworks)","Q_Score":1,"Tags":"python,django,database,django-models,webserver","A_Id":60820292,"CreationDate":"2020-03-23T18:58:00.000","Title":"How to reach and add new row to web server database which made in Django framework?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to python\/pycharm and AWS SAM applications. My company has created a few AWS SAM apps and they have worked previously on my machine. Now I am unable to get even the example hello world AWS SAM solution to run on my machine. I'm not sure if this is a docker or pycharm issue. When I try to debug the application, this is the error I receive:\nFetching lambci\/lambda:python3.8 Docker container image...............\nMounting C:\\Dev\\git\\ULServices\\TestRun.aws-sam\\build\\HelloWorldFunction as \/var\/task:ro,delegated inside runtime container\n\/var\/lang\/bin\/python3.8: can't open file '\/tmp\/lambci_debug_files\/pydevd.py': [Errno 1] Operation not permitted\nI am on Windows 10 and have the latest version of Docker\/PyCharm\/AWS SAM CLI","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":479,"Q_Id":60840846,"Users Score":1,"Answer":"This was a Docker issue. Release 2.2.0.5 on Apr 2, 2020 fixed the issue. From their release notes: \nFixed a bug where opening a read-only file would fail with an Operation not permitted error. Fixes docker\/for-win#6016 and docker\/for-win#6017.\nI have turned off automatic updates since this is what initially caused the issue for me since it was working in a previous version.","Q_Score":2,"Tags":"python,docker,pycharm,aws-sam","A_Id":60995639,"CreationDate":"2020-03-24T23:23:00.000","Title":"Not able to debug AWS SAM hello world application","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"im working on a new project where by i wish to be able to build a django project around an existing SAPB1 application that is in production. My goal of doing so is to be able to extract certain information from SAP database and sync them with my django database as well as write certain things into the SAP database from my django program. An example is , i would wish to generate a payment voucher from my program , and write it into the SAP data base. \nIs there a suitable API for such a task? I have done certain research and it seems like my client's SAPB1 does not have python RFC feature. A possible alternative would be the DI API , however most materials are written in c# which is not my expertise , therefore would love to hear your advise! \nthanks!","AnswerCount":4,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":745,"Q_Id":60850140,"Users Score":0,"Answer":"you can load the DI API dll with pywin32 to python.\nYou can get the company object and query, add, and modify whatever you need.\nIssue with Django (and Flask) might be, that it is loading multiple threads, and therefore be not very efficient (compared to DI Server). Be sure to share one connection.","Q_Score":1,"Tags":"python,django,sapb1,sap-business-one-di-api","A_Id":66844468,"CreationDate":"2020-03-25T13:44:00.000","Title":"SAPB1 and django integration","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"im working on a new project where by i wish to be able to build a django project around an existing SAPB1 application that is in production. My goal of doing so is to be able to extract certain information from SAP database and sync them with my django database as well as write certain things into the SAP database from my django program. An example is , i would wish to generate a payment voucher from my program , and write it into the SAP data base. \nIs there a suitable API for such a task? I have done certain research and it seems like my client's SAPB1 does not have python RFC feature. A possible alternative would be the DI API , however most materials are written in c# which is not my expertise , therefore would love to hear your advise! \nthanks!","AnswerCount":4,"Available Count":2,"Score":0.049958375,"is_accepted":false,"ViewCount":745,"Q_Id":60850140,"Users Score":1,"Answer":"I will vote to the Service Layer which is a RESTFul API that allows you to build your strong extension platform.  It builds on core protocols such as HTTP and OData, and provides a uniform way to expose full-featured business objects on top of a highly scalable and high-availability Web server.","Q_Score":1,"Tags":"python,django,sapb1,sap-business-one-di-api","A_Id":68366030,"CreationDate":"2020-03-25T13:44:00.000","Title":"SAPB1 and django integration","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to do a tutorial through FreeCodeCamp using Python's Flask Framework to create a web app in PyCharm and I am stuck on a section where it says 'Flask looks for HTML files in a folder called template. You need to create a template folder and put all your HTML files in there.' I am confused on how to make this template folder; is it just a regular folder or are there steps to create it and drag\/drop the HTML files to it? Any tips or info would be of great help!!!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":363,"Q_Id":60861038,"Users Score":0,"Answer":"As the tutorial ask you, you have to create a folder call \"templates\" (not \"template\"). In PyCharm you can do this by right-clicking on the left panel and select New I Directory. In this folder you can then create your template files (right click on the newly created folder and select New I File, then enter the name of your file with the .html extension).\nBy default, flask looks in the \"templates\" folder to find your template when you call render_template(\"index.html\").  Notice that you don\u2019t put the full path of your file at the first parameter but just the relative path to the \"templates\" folder.","Q_Score":0,"Tags":"python,html,flask,pycharm","A_Id":60861283,"CreationDate":"2020-03-26T04:29:00.000","Title":"How do I create a template to store my HTML file when creating a web app with Python's Flask Framework in the PyCharm IDE?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I know that environments are used for backward-compatibility and to create a box where we can download packages without affecting the rest of the computer.\nI am working on a couple of django projects and I was wondering if I need to create a new conda environment for each new project or can I use the same one? What might go wrong if I use the same environment for similar web-development project?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":147,"Q_Id":60862106,"Users Score":1,"Answer":"You can use same conda environment for 2 or more projects , it is ok for local setup but when you deploy you will have to filter all the unwanted requirements","Q_Score":0,"Tags":"python,django,conda","A_Id":60862295,"CreationDate":"2020-03-26T06:40:00.000","Title":"Can I use the same conda environment for different Django projects?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"i just started playing with python on the last version of visual studio 2019. I added a new project flask web project. by adding `\n\nfrom flask import Flask`\n\nI get unresolved import flask. what else tool, or modules should I import to my solution? any help would be greatly appreciated","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":388,"Q_Id":60864323,"Users Score":0,"Answer":"By adding flask env inside of the solution it has been compiled and run in the localhostf","Q_Score":0,"Tags":"python,flask,visual-studio-2019","A_Id":60886270,"CreationDate":"2020-03-26T09:33:00.000","Title":"unresolved import flask visual studio 2019","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"The question is about generic views, and their use in practice. They are presented  as a better, cleaner, alternative for writing custom views, however they didn't seem to simply the view code much, and seemed very case specific. So in practice, are these generic views used extensively, with custom ones written only for very specific cases? Or is it the opposite, and generic views only exist for minimalists\/case specific needs?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":53,"Q_Id":60872054,"Users Score":0,"Answer":"The most common operations for any backend application, are create, read, update and delete - more commonly known as CRUD operations. These will cover almost all use-cases for your API. Generic views provide methods for these operations and much more, meaning that you don't have to repeat the same code over and over again throughout your application. These classes and methods provided by the DRF are also extensible, allowing you to alter them to your needs, when required.","Q_Score":0,"Tags":"python,django,view,django-views","A_Id":60875624,"CreationDate":"2020-03-26T16:43:00.000","Title":"Custom vs Generic Views in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've seen how to make a post request from JavaScript to get data from the server, but how would I do this flipped. I want to trigger a function in the flask server that will then dynamically update the variable on the JavaScript side to display. Is there a way of doing this in a efficient manner that does not involve a periodic iteration. I'm using an api and I only want to the api to be called once to update.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":45,"Q_Id":60872081,"Users Score":1,"Answer":"There are three basic options for you:\n\nPolling - With this method, you would periodically send a request to the server (maybe every 5 seconds for example) and ask for an update. The upside is that it is easy to implement. The downside is that many requests will be unnecessary. It sounds like this isn't a great option for you. \nLong Polling - This method means you would open a request up with the server and leave the request open for a long period of time. When the server gets new information it will send a response and close the request - after which the client will immediately open up a new \"long poll\" request. This eliminates some of the unnecessary requests with regular polling, but it is a bit of a hack as HTTP was meant for a reasonably short request response cycle. Some PaaS providers only allow a 30 second window for this to occur for example. \nWeb Sockets - This is somewhat harder to setup, but ultimately is the best solution for real time server to client (and vice versa) communication. A socket connection is opened between the server and client and data is passed back and forth whenever either party would like to do so. Javascript has full web socket support now and Flask has some extensions that can help you get this working. There are even great third party managed solutions like Pusher.com that can give you a working concept very quickly.","Q_Score":0,"Tags":"javascript,python,flask","A_Id":60872227,"CreationDate":"2020-03-26T16:45:00.000","Title":"How do I receive a variable from python flask to JavaScript?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying for the first time to use mongo, and I choose mongoengine.\nAfter defining the Document structure if I try to change it (adding a field, removing a field, renaming ecc..) the reading operations still works, but any other operation on previously stored document fail since they're note compliant anymore with the document structure.\nIs there any way to manage this situation? should I only user Dynamic documents with Dictionaries instead of EmbeddedDocuments?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":148,"Q_Id":60873361,"Users Score":1,"Answer":"Using DynamicDocument or setting meta = {'strict': False} on your Document may help in some cases but the only proper solution to this is running a migration script.\nI'd recommend doing this using pymongo but you could also do that from the mongo shell. Every time your model change in a way that is not compatible, you should run a migration on the existing data so that it fits the new model. Otherwise mongoengine will complain at some point (mongoengine contributor here)","Q_Score":0,"Tags":"python,mongodb,mongoengine,flask-mongoengine","A_Id":60968246,"CreationDate":"2020-03-26T17:56:00.000","Title":"Mongoengine change document structure","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need your opinion on a challenge that I'm facing. I'm building a website that uses Django as a backend, PostgreSQL as my DB, GraphQL as my API layer and React as my frontend framework. Website is hosted on Heroku. I wrote a python script that logs me in to my gmail account and parse few emails, based on pre-defined conditions, and store the parsed data into Google Sheet. Now, I want the script to be part of my website in which user will specify what exactly need to be parsed (i.e. filters) and then display the parsed data in a table to review accuracy of the parsing task.\nThe part that I need some help with is how to architect such workflow. Below are few ideas that I managed to come up with after some googling:\n\ngenerate a graphQL mutation that stores a 'task' into a task model. Once a new task entry is stored, a Django Signal will trigger the script. Not sure yet if Signal can run custom python functions, but from what i read so far, it seems doable.\nUse Celery to run this task asynchronously. But i'm not sure if asynchronous tasks is what i'm after here as I need this task to run immediately after the user trigger the feature from the frontend. But i'm might be wrong here. I'm also not sure if I need Redis to store the task details or I can do that on PostgreSQL.\n\nWhat is the best practice in implementing this feature? The task can be anything, not necessarily parsing emails; it can also be importing data from excel. Any task that is user generated rather than scheduled or repeated task.\nI'm sorry in advance if this question seems trivial to some of you. I'm not a professional developer and the above project is a way for me to sharpen my technical skills and learn new techniques. \nLooking forward to learn from your experiences.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":156,"Q_Id":60874753,"Users Score":1,"Answer":"You can dissect your problem into the following steps:\n\nUser specifies task parameters\nSystem executes task\nSystem displays result to the User\n\nYou can either do all of these:\n\nSequentially and synchronously in one swoop; or\nStep by step asynchronously.\n\nSynchronously\nYou can run your script when generating a response, but it will come with the following downsides:\n\nThe process in the server processing your request will block until the script is finished. This may or may not affect the processing of other requests by that same server (this will depend on the number of simultaneous requests being processed, workload of the script, etc.)\nThe client (e.g. your browser) and even the server might time out if the script takes too long. You can fix this to some extent by configuring your server appropriately.\n\nThe beauty of this approach however is it's simplicity. For you to do this, you can just pass the parameters through the request, server parses and does the script, then returns you the result.\nNo setting up of a message queue, task scheduler, or whatever needed.\nAsynchronously\nIdeally though, for long-running tasks, it is best to have this executed outside of the usual request-response loop for the following advantages:\n\nThe server responding to the requests can actually serve other requests.\nSome scripts can take a while, some you don't even know if it's going to finish\nScript is no longer dependent on the reliability of the network (imagine running an expensive task, then your internet connection skips or is just plain intermittent; you won't be able to do anything)\n\nThe downside of this is now you have to set more things up, which increases the project's complexity and points of failure.\nProducer-Consumer\nWhatever you choose, it's usually best to follow the producer-consumer pattern:\n\nProducer creates tasks and puts them in a queue\nConsumer takes a task from the queue and executes it\n\nThe producer is basically you, the user. You specify the task and the parameters involved in that task.\nThis queue could be any datastore: in-memory datastore like Redis; a messaging queue like RabbitMQ; or an relational database management system like PostgreSQL.\nThe consumer is your script executing these tasks. There are multiple ways of running the consumer\/script: via Celery like you mentioned which runs multiple workers to execute the tasks passed through the queue; via a simple time-based job scheduler like crontab; or even you manually triggering the script\nThe question is actually not trivial, as the solution depends on what task you are actually trying to do. It is best to evaluate the constraints, parameters, and actual tasks to decide which approach you will choose.\nBut just to give you a more relevant guideline:\nJust keep it simple, unless you have a compelling reason to do so (e.g. server is being  bogged down, or internet connection is not reliable in practice), there's really no reason to be fancy.\nThe more blocking the task is, or the longer the task takes or the more dependent it is to third party APIs via the network, the more it makes sense to push this to a background process add reliability and resiliency.\nIn your email import script, I'll most likely push that to the background:\n\nHave a page where you can add a task to the database\nIn the task details page, display the task details, and the result below if it exists or \"Processing...\"  otherwise\nHave a script that executes tasks (import emails from gmail given the task parameters) and save the results to the database\nSchedule this script to run every few minutes via crontab\n\nYes the above has side effects, like crontab running the script in multiple times at the same time and such, but I won't go into detail without knowing more about the specifics of the task.","Q_Score":0,"Tags":"python,django,graphql,django-celery","A_Id":60877018,"CreationDate":"2020-03-26T19:28:00.000","Title":"Best Way to Handle user triggered task (like import data) in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a python script that generates a heightmap depending on parameters, that will be given in HTML forms. How do I display the resulting image on a website? I suppose that the form submit button will hit an endpoint with the given parameters and the script that computes the heightmap runs then, but how do I get the resulting image and display it in the website? Also, the computation takes a few seconds, so I suppose I need some type of task queue to not make the server hang in the meanwhile. Tell me if I'm wrong.\nIt's a bit of a general question because I myself don't know the specifics of what I need to use to accomplish this. I'm using Flask in the backend but it's a framework-agnostic question.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":28,"Q_Id":60875763,"Users Score":1,"Answer":"Save the image to a file. Return a webpage that contains an <IMG SRC=...> element. The SRC should be a URL pointing at the file.\nFor example, suppose you save the image to a file called \"temp2.png\" in a subdirectory called \"scratch\" under your document root. Then the IMG element would be <IMG SRC=\"\/scratch\/temp2.png\"> .\nIf you create and save the image in the same program that generates the webpage that refers to it, your server won't return the page until the image has been saved. If that only takes a few seconds, the server is unlikely to hang. Many applications would take that long to calculate a result, so the people who coded the server would make sure it can handle such delays. I've done this under Apache, Tomcat, and GoServe (an OS\/2 server), and never had a problem.\nThis method does have the disadvantage that you'll need to arrange for each temporary file to be deleted after an expiry period such as 12 hours or whenever you think the user won't need it any more. On the webpage you return, if the image is something serious that the user might want to keep, you could warn them that this will happen. They can always download it.\nTo delete the old files, write a script that checks when they were last updated, compares that with the current date and time, and deletes those files that are older than your expiry period. \nYou'll need a way to automatically run it repeatedly. On Unix systems, if you have shell access, the \"cron\" command is one way to do this. Googling \"cron job to delete files older than 1 hour on web server\" finds a lot of discussion of methods.\nBe very careful when coding any automatic-deletion script, and test it thoroughly to make sure it deletes the right files! If you make your expiry period a variable, you can set it to e.g. 1 minute or 5 minutes when testing, so that you don't need to wait for ages.\nThere are ways to stream your image back without saving it to a file, but what I'm recommending is (apart possibly from the file deleter) easy to code and debug. I've used it in many different projects.","Q_Score":0,"Tags":"javascript,python,html,web","A_Id":60879854,"CreationDate":"2020-03-26T20:40:00.000","Title":"Display result (image) of computation in website","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I would like to create a website where I show some text but mainly dynamic data in tables and plots. Let us assume that the user can choose whether he wants to see the DAX or the DOW JONES prices for a specific timeframe. I guess these data I have to store in a database. As I am not experienced with creating websites, I have no idea what the most reasonable setup for this website would be. \n\nWould it be reasonable for this example to choose a database where every row corresponds of 9 fields, where the first column is the timestamp (lets say data for every minute), the next four columns correspond  to the high, low, open, close price of DAX for this timestamp and columns 5 to 9 correspond to high, low, open, close price for DOW JONES?\nCould this be scaled to hundreds of columns with a reasonable speed\nof the database?\nIs this an efficient implementation?\nWhen this website is online, you can choose whether you want to see DAX or DOW JONES prices for a specific timeframe. The corresponding data would be chosen via python from the database and plotted in the graph. Is this the general idea how this will be implemented?\nTo get the data, I can run another python script on the webserver to dynamically collect the desired data and write them in the database?\n\nAs a total beginner with webhosting (is this even the right term?) it is very hard for me to ask precise questions. I would be happy if I could find out whats the general structure I need to create the website, the database and the connection between both. I was thinking about amazon web services.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":65,"Q_Id":60876970,"Users Score":0,"Answer":"You could use a database, but that doesn't seem necessary for what you described.\nIt would be reasonable to build the database as you described.  Look into SQL for doing so.  You can download a package XAMPP that will give you pretty much everything you need for that.  This is easily scalable to hundreds of thousands of entries - that's what databases are for.\nIf your example of stock prices is actually what you are trying to show, however, this is completely unnecessary as there are already plenty of databases that have this data and will allow you to query them.  What you would really want in this scenario is an API.  Alpha Vantage is a free service that will serve you data on stock prices, and has plenty of documentation to help you get it set up with python.\nI would structure the project like this:\nUse the python library Flask to set up the back end.\nIn addition to instantiating the Flask app, instantiate the Alpha Vantage class as well (you will need to pip install both of these).\nIn one of the routes you declare under Flask, use the Alpha Vantage api to get the data you need and simply display it to the screen.\nIf I am assuming you are a complete beginner, one or more of those steps may not make sense to you, in which case take them one at a time.  Start by learning how to build a basic Flask app, then look at the API.\nYouTube is your friend for both of these things.","Q_Score":1,"Tags":"python,database,amazon-web-services,web-hosting","A_Id":60877086,"CreationDate":"2020-03-26T22:11:00.000","Title":"How to create a dynamic website using python connected to a database","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I had a different question here, but realized it simplifies to this:\nHow do you detect when a client disconnects (closes their page or clicks a link) from a page (in other words, the socket connection closes)? I want to make a chat app with an updating user list, and I\u2019m using Flask on Python. When the user connects, the browser sends a socket.emit() with an event and username passed in order to tell the server a new user exists, after which the server will message all clients with socket.emit(), so that all clients will append this new user to their user list. However, I want the clients to also send a message containing their username to the server on Disconnect. I couldn\u2019t figure out how to get the triggers right. Note: I\u2019m just using a simple html file with script tags for the page, I\u2019m not sure how to add a JS file to go along with the page, though I can figure it out if it\u2019s necessary for this.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2837,"Q_Id":60879701,"Users Score":6,"Answer":"Figured it out. socket.on('disconnect') did turn out to be right, however by default it pings each user only once a minute or so, meaning it took a long time to see the event.","Q_Score":6,"Tags":"python,python-3.x,sockets,flask,socket.io","A_Id":61133214,"CreationDate":"2020-03-27T03:41:00.000","Title":"SocketIO + Flask Detect Disconnect","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My worker is run with:\ncelery worker -A workerTasks -n Worker%h --concurrency=1 --loglevel=info -Q $QUEUE_NAME -f $WORKER_LOG_FILE --pidfile=\/logs\/worker_pid%h.pid\nI'm wondering if I can make a python\/celery call within the process to find which queue(s) this worker is \"subscribed\" to?\n(I do NOT want to find the value of $QUEUE_NAME directly)","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":95,"Q_Id":60888115,"Users Score":0,"Answer":"celery -A workerTasks inspect active_queues -d <worker name>, where worker name is the name of that particular node. If you omit -w <worker name> each node will send you report about which queue it is subscribed to.","Q_Score":1,"Tags":"python,django,celery","A_Id":60890077,"CreationDate":"2020-03-27T14:33:00.000","Title":"How to get list of subscribed queue names in Celery\/Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"My python version is Python 3.7.7 and scrapy requires Python 3.5 or above, yet in Atom I'm getting the following error:\n\n\"scrapy 2.0.1 requires Python 3.5\"\n\nI have previously had trouble with Atom defaulting to Python2, so have already updated python.coffee command to 'python3'.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":74,"Q_Id":60908044,"Users Score":0,"Answer":"uninstall python 2.x can solve this problem","Q_Score":0,"Tags":"python-3.x,scrapy,atom-editor","A_Id":61201076,"CreationDate":"2020-03-28T22:58:00.000","Title":"Scrapy error: \"scrapy 2.0.1 requires Python 3.5\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We are building an AI enabled web application that uses huge memory models that ideally should be loaded only once in memory as global variables.\nThese variables are to be used by different management commands which run as individual processes and make use of the Django framework. And of course, the runserver command too accesses these global variables.\nThese models are loaded inside a single module commons but since we are spawning different processes, let us assume two for now - runserver and process_tasks, these models are essentially loaded twice in memory via the commons module.\nIs there a way to load these models centrally and share the variables between independently spawned processes. I'm aware of the multiprocessing module in python and the Manager API, but can't figure out a way for incorporating it with the current scenario.\nIs there a way to run a standalone python process that holds these variables and be able to access them from multiple other processes?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":75,"Q_Id":60911430,"Users Score":0,"Answer":"I know there isn't a 'proper' solution to this. I used a crude approach of writing a temp file after having these models loaded in the \\schema.py and then import the object model into my 'business_logic.py' checking if the file is there, then don't initialize the model again.\nHope it helps others.","Q_Score":0,"Tags":"python,django,shared-memory","A_Id":61681070,"CreationDate":"2020-03-29T07:47:00.000","Title":"Access variables without re-loading them between management commands in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So, i had a working report, using bokeh and some Select buttons with callbacks using CustomJS.\n(if its important, I have a simple DataTable, which I change the data according to the selected value in the Select button)\nMy bokeh version was 0.12.5 and everything worked ok.\nSince upgrading to 1.3.0, the report is broken.\nLooking at the source, this is the error I'm seeing:\nbokeh-tables-1.3.0.min.js:86 Uncaught Error: SlickGrid's 'enableColumnReorder = true' option requires jquery-ui.sortable module to be loaded\nTried looking for solutions online, couldn't find anything.\nAnyone have any idea? Do I need to load sortable module somehow?\nthanks!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":384,"Q_Id":60912991,"Users Score":0,"Answer":"In the JavaScript console, you should've received this warning: jquery-ui is required to enable DataTable.reorderable. So yes, you have to load jquery-ui yourself.","Q_Score":0,"Tags":"javascript,python,bokeh","A_Id":60913577,"CreationDate":"2020-03-29T10:38:00.000","Title":"bokeh issue - Uncaught Error: SlickGrid's 'enableColumnReorder = true' option requires jquery-ui.sortable module to be loaded","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to submit a job to EMR cluster via Livy. My Python script (to submit job) requires importing a few packages. I have installed all those packages on the master node of EMR. The main script resides on S3 which is being called by the script to submit job to Livy from EC2. Everytime I try to run the job on a remote machine (EC2), it dies stating Import Errors(no module named [mod name] )\nI have been stuck on it for more than a week and unable to find a possible solution. Any help would be highly appreciated.\nThanks.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1096,"Q_Id":60931595,"Users Score":1,"Answer":"These packages that you are trying to import. Are they custom packages ? if so how did you package them. Did you create a wheel file or zip file and specify them as --py-files in your spark submit via livy ?\nPossible problem.\nYou installed the packages only on the master node. You will need to log into your worker nodes and install the packages there too. Else when u provision the emr , install the packages using bootstrap actions\nYou should be able to add libraries via \u2014py-files option, but it\u2019s safer to just download the wheel files and use them rather than zipping anything yourself.","Q_Score":1,"Tags":"python,python-3.x,amazon-emr,livy","A_Id":60941345,"CreationDate":"2020-03-30T13:26:00.000","Title":"Python packages not importing in AWS EMR","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm building a django webapp where i need to stream some stock market trades on a webpage in real time. In order to do that, i'm searching for various approaches, and i found about Pusher and RabbitMQ.\nWith RabbitMQ i would just send the message to RMQ and consume them from Django, in order to get them on the web page. While looking for other solutions, i've also found about Pusher. What it's not clear, to me, is the difference between the two, technically. I don't understand where would i use Rabbit and where would i use Pusher, can someone explain to me how are they different? Thanks in advance!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":741,"Q_Id":60935742,"Users Score":4,"Answer":"You may be thinking of data delivery, non-blocking operations or push\nnotifications. Or you want to use publish \/ subscribe, asynchronous\nprocessing, or work queues. All these are patterns, and they form\npart of messaging.\nRabbitMQ is a messaging broker - an intermediary for messaging. It\ngives your applications a common platform to send and receive\nmessages, and your messages a safe place to live until received.\nPusher is a hosted service that makes it super-easy to add real-time data and functionality to web and mobile applications.\nPusher sits as a real-time layer between your servers and your\nclients. Pusher maintains persistent connections to the clients -\nover WebSocket if possible and falling back to HTTP-based\nconnectivity - so that as soon as your servers have new data that\nthey want to push to the clients they can do, instantly via Pusher.\nPusher offers libraries to integrate into all the main runtimes and\nframeworks. PHP, Ruby, Python, Java, .NET, Go and Node on the server\nand JavaScript, Objective-C (iOS) and Java (Android) on the client.","Q_Score":0,"Tags":"python,django,rabbitmq,pusher","A_Id":60935979,"CreationDate":"2020-03-30T17:08:00.000","Title":"What's the difference between RabbitMQ and Pusher?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have scheduled a python web-scraper to run everyday at specified time. This puts load on spyder memory after a while results in system crash. Is there a way to solve this issue?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":322,"Q_Id":60938355,"Users Score":0,"Answer":"I had the same problem with using Spyder IDE for a process that I was running.\nThings like deleting variables and using gc.collect() didn't work to free memory within a loop for my script on Ubuntu 20.04.\nThe way I got around having memory crash problems in long loops inside of Spyder was to run the script in terminal instead of Spyder using python my_script.py.  This worked for me and my loops or long processes aren't crashing my memory anymore!  Goodluck!","Q_Score":1,"Tags":"python,memory,web-scraping,spyder,scheduler","A_Id":63410519,"CreationDate":"2020-03-30T19:46:00.000","Title":"Is there a way to free used memory in Spyder?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"this has weighed me down for a week now. seems like there's no straight-forward solution anywhere, I'm really devastated.\nI have hosted my python flask webapp and it's postgres database successfully. Now I only need to link it with any cloud (not Google pls!) service that would enable the webapp to save images, and retrieve these images on request. \nI plan to use redis for caching these images, greatly reducing the rate of requests sent to the cloud storage. \nPlease help!","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":446,"Q_Id":60951615,"Users Score":1,"Answer":"when you talk about save or retrieve on cloud storage what kind of storage that you have in mind? because there's few approach:\nA. Store image \/ video as Binary\nUsing this approach it means all uploaded file or image will be written into db and all requested file will be read from db.\nB. Store image \/ video as path \nUsing this approach it means if its local path then it all uploaded file will stored as local file in the server where the code is hosted.\nif its remote path then it will stored on some cloud (Google Cloud Storage, AWS S3)\nAlso in your question you mention about redis as cache. I want to clarify some few things about redis. In approach A if you want to reduce query sent to db you can utilize redis to store binary of frequent accessed file, so on the next request it will be fetch from cache instead from db. In approach B redis doesn't really reduce 'requests sent to the cloud storage' because client still fetch the file  from cloud storage and your app just return where it stored. if you want to reduce no of request sent to cloud storage then maybe you looking about client-side cache or CDN.","Q_Score":0,"Tags":"python,cloud","A_Id":60962425,"CreationDate":"2020-03-31T13:21:00.000","Title":"save and retrieve images\/videos on cloud storage linked to python flask server","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am learning Django and the tutorial requires downloading Pycharm, which looks almost similar to my android studio IDE. So, can I do the same with android studio or I will have to download Pycharm ?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":373,"Q_Id":60954673,"Users Score":1,"Answer":"Yes you have to download it. All the programs of Jetbrains are apparently identical. In the background, each program contains rules for the programming language. The rules of java do not follow python. So you should download the language-specific IDE you use.","Q_Score":0,"Tags":"python,django,android-studio,pycharm","A_Id":60954774,"CreationDate":"2020-03-31T15:53:00.000","Title":"Can I use android studio in place of Pycharm for learning Django .. If No.. why? and if Yes ..how?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"What is a secure way to save multiple credentials needed by an API developed in Python Flask?\nIs it ok to encrypt\/hash and save credentials in a database or configuration file? As storing data this way seems to be insecure and also when password changes, we'll have to update the database somehow.\nIs there any better way available?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":97,"Q_Id":60957303,"Users Score":1,"Answer":"For production environments, secrets are usually kept in something designed to keep secrets, such as Hashicorp secrets vault, Azure Key Vault or AWS Secrets Manager. These are securely kept in the environments and are only available there.\nDeveloping locally you could use Keybase as a place to keep your secrets in files and mount the secrets directory.\nJust remember that encrypting your credentials is pointless if you hardcode the decryption key in the source code, which brings you back to the same question, where do you keep your decryption key? The answer; secrets manager \/ vaults.","Q_Score":0,"Tags":"python,api,flask","A_Id":60959522,"CreationDate":"2020-03-31T18:19:00.000","Title":"How to save multiple credentials securely for an API in Python Flask?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"(ll_env) C:\\learning_log>python manage.py test  Traceback (most recent call last):   File \"manage.py\", line 21, in \n      main()   File \"manage.py\", line 17, in main\n      execute_from_command_line(sys.argv)   File \"C:\\Users\\Allen\\AppData\\Local\\Programs\\Python\\Python37-32\\lib\\site-packages\\django\\core\\management__init__.py\",\n  line 381, in execute_from_command_line\n      utility.execute()   File \"C:\\Users\\Allen\\AppData\\Local\\Programs\\Python\\Python37-32\\lib\\site-packages\\django\\core\\management__init__.py\",\n  line 375, in execute\n      self.fetch_command(subcommand).run_from_argv(self.argv)   File \"C:\\Users\\Allen\\AppData\\Local\\Programs\\Python\\Python37-32\\lib\\site-packages\\django\\core\\management\\commands\\test.py\",\n  line 23, in run_from_argv\n      super().run_from_argv(argv)   File \"C:\\Users\\Allen\\AppData\\Local\\Programs\\Python\\Python37-32\\lib\\site-packages\\django\\core\\management\\base.py\",\n  line 315, in run_from_argv\n      parser = self.create_parser(argv[0], argv[1])   File \"C:\\Users\\Allen\\AppData\\Local\\Programs\\Python\\Python37-32\\lib\\site-packages\\django\\core\\management\\base.py\",\n  line 289, in create_parser\n      self.add_arguments(parser)   File \"C:\\Users\\Allen\\AppData\\Local\\Programs\\Python\\Python37-32\\lib\\site-packages\\django\\core\\management\\commands\\test.py\",\n  line 44, in add_arguments\n      test_runner_class = get_runner(settings, self.test_runner)   File\n  \"C:\\Users\\Allen\\AppData\\Local\\Programs\\Python\\Python37-32\\lib\\site-packages\\django\\test\\utils.py\",\n  line 303, in get_runner\n      test_runner_class = test_runner_class or settings.TEST_RUNNER   File\n  \"C:\\Users\\Allen\\AppData\\Local\\Programs\\Python\\Python37-32\\lib\\site-packages\\django\\conf__init__.py\",\n  line 79, in getattr\n      self._setup(name)   File \"C:\\Users\\Allen\\AppData\\Local\\Programs\\Python\\Python37-32\\lib\\site-packages\\django\\conf__init__.py\",\n  line 66, in _setup\n      self._wrapped = Settings(settings_module)   File \"C:\\Users\\Allen\\AppData\\Local\\Programs\\Python\\Python37-32\\lib\\site-packages\\django\\conf__init__.py\",\n  line 157, in init\n      mod = importlib.import_module(self.SETTINGS_MODULE)   File \"C:\\Users\\Allen\\AppData\\Local\\Programs\\Python\\Python37-32\\lib\\importlib__init__.py\",\n  line 127, in import_module\n      return _bootstrap._gcd_import(name[level:], package, level)   File \"\", line 1006, in _gcd_import\n  File \"\", line 983, in _find_and_load\n  File \"\", line 967, in\n  _find_and_load_unlocked   File \"\", line 677, in _load_unlocked   File \"\", line 728, in exec_module   File\n  \"\", line 219, in\n  _call_with_frames_removed   File \"C:\\learning_log\\learning_log\\settings.py\", line 16, in \n      django.setup()   File \"C:\\Users\\Allen\\AppData\\Local\\Programs\\Python\\Python37-32\\lib\\site-packages\\django__init__.py\",\n  line 19, in setup\n      configure_logging(settings.LOGGING_CONFIG, settings.LOGGING)   File\n  \"C:\\Users\\Allen\\AppData\\Local\\Programs\\Python\\Python37-32\\lib\\site-packages\\django\\conf__init__.py\",\n  line 79, in getattr\n      self._setup(name)   File \"C:\\Users\\Allen\\AppData\\Local\\Programs\\Python\\Python37-32\\lib\\site-packages\\django\\conf__init__.py\",\n  line 66, in _setup\n      self._wrapped = Settings(settings_module)   File \"C:\\Users\\Allen\\AppData\\Local\\Programs\\Python\\Python37-32\\lib\\site-packages\\django\\conf__init__.py\",\n  line 176, in init\n      raise ImproperlyConfigured(\"The SECRET_KEY setting must not be empty.\")django.core.exceptions.ImproperlyConfigured: The SECRET_KEY\n  setting must not be empty.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":61,"Q_Id":60958698,"Users Score":0,"Answer":"Error has nothing to do with your model or admin site. You are running your Django Program  with a settings file that doesn't have a SECRET_KEY","Q_Score":0,"Tags":"python,django","A_Id":60958736,"CreationDate":"2020-03-31T19:47:00.000","Title":"registering a model with the admin site, Once I try to define the entry Model system shows unproperly configured exception","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I made an Amazon Web Scraper and I want it work as an extension. What will happen is that it will  display the price if it is lower than the previously recorded price. I don't know Javascript. I went through things like Transcrypt but didn't understand much","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":406,"Q_Id":60972721,"Users Score":0,"Answer":"You cannot. Chrome extensions are written in JS.\nThe only way to accomplish what you want is to use the extension as a bridge from users browser to your script. You'll need to convert the script into a server of some kind that can accept requests from the extension and respond.","Q_Score":1,"Tags":"python,selenium-webdriver,google-chrome-extension","A_Id":60976107,"CreationDate":"2020-04-01T14:04:00.000","Title":"How do I package a Python web scraper as a Chrome Extension?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am evaluating python memory profiling. I would like to automate memory leak profiling with Jenkins and publish the report to Sonarqube. The current memory tool I am using is memory_profiler. Does Jenkins & Sonarqube support this integration? Or are there any python memory tools which I should consider which can integrate well into Jenkins & Sonarqube? Thanks","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":159,"Q_Id":60983567,"Users Score":0,"Answer":"Well, I don't think Sonarqube supports that. \nThe only thing that I see you could do, is to run the memory profiler as you are doing, but instead of uploading to sonarqube as per your approach, you could create a html report from the memory profiler results and attach it to your Jenkins build.","Q_Score":3,"Tags":"python,jenkins,testing,memory,sonarqube","A_Id":61457197,"CreationDate":"2020-04-02T02:56:00.000","Title":"Python memory profiler with Sonarqube & Jenkins","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"slides=prs1.slides\n    for slide in prs1.slides:\n        ImageData.insert(1, \"Slide \"+str(slides.index(slide)+1))\n        TextData.insert(1, \"Slide \"+str(slides.index(slide)+1))\n        for shape in slide.shapes:\n            if 'Picture' in shape.name:\n                write_image(shape, ImageData)\n            elif shape.has_table:\n                table_data(shape, TextData)\n            elif shape.has_text_frame:\n                s=\"\"\n                for paragraph in shape.text_frame.paragraphs:\n                    for run in paragraph.runs:\n                        s+= \" \"+run.text\n                TextData.append(s)\n            elif shape.shape_type == MSO_SHAPE_TYPE.GROUP:\n                group_data(shape, ImageData, TextData)\n\ndef group_data(group_shape, ImageData, TextData):\n    #for group_shape in group_shapes:\n    for shape in group_shape.shapes:\n        if 'Picture' in shape.name:\n            if (ImageData == []):\n                ImageData.append(\"Slide \"+str(slides.index(slide)+1))\n            write_image(shape, ImageData)\n        elif shape.has_table:\n            TextData.append(\"Slide \"+str(slides.index(slide)+1))\n            table_data(shape, TextData)\n        elif shape.has_text_frame:\n            if (TextData == []):\n                TextData.append(\"Slide \"+str(slides.index(slide)+1))\n            s=\"\"\n            for paragraph in shape.text_frame.paragraphs:\n                for run in paragraph.runs:\n                    s+= \" \"+run.text\n                    TextData.append(s)\n        elif shape.shape_type == MSO_SHAPE_TYPE.GROUP:\n            group_data(shape, ImageData, TextData)\nI'm not able to read SmartArt data from slides. This is the above code through which i'm able to get 80% of pptx file data. I want to fetch 100% data and store it in a csv file. Even i want to save ppt file as pptx file using python code.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":449,"Q_Id":61013161,"Users Score":1,"Answer":"python-pptx has no API-support for SmartArt. The schema and semantics for the XML of SmartArt are unpublished (the last time I went looking) so it's not likely to be added anytime soon.\nIf you want to interpret SmartArt objects you'll have to dig into the XML yourself and do the best you can.\nLike a chart or a table, SmartArt is enclosed in a GraphicFrame shape. Like a chart, its contents are stored as a separate part.\nNot really an answer, but at least some background to get you started. I recommend you look for an alternative because this direction is going to be a lot of frustrating work that probably ends up in brittle code because you're reverse-engineering rather that working from a spec.","Q_Score":0,"Tags":"python-pptx","A_Id":61016223,"CreationDate":"2020-04-03T13:36:00.000","Title":"How to read PowerPoint SmartArt Data using python ? Python-PPTX","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to run my Django server via 'python manage.py runserver' on a github repository i cloned and always get this runtime error message:\n\nclass AbstractBaseUser(models.Model):\nRuntimeError: ____class____ not set defining 'AbstractBaseUser' as <'class 'django.contrib.auth.base_user.AbstractBaseUser'>. Was ____classcell____ propagated to type.____new____?\n\nDetails of installed packages in my virtual environment are:\nDjango               1.9 |\ndjango-crispy-forms  1.6.0 |\ndjango-markdown-deux 1.0.5 |\ndjango-pagedown      0.1.1 |\nmarkdown2            2.3.1 |\nolefile              0.46 |\nPillow               7.1.1 |\npip                  19.2.3 |\nsetuptools           41.2.0 |\nI am using python version 3.8.1\nplease does anyone have any suggestions on how to solve this error. Thank you.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":175,"Q_Id":61017033,"Users Score":0,"Answer":"RuntimeError at \/save\nYou called this URL via POST, but the URL doesn't end in a slash and you have APPEND_SLASH set. Django can't redirect to the slash URL while maintaining POST data. Change your form to point to 127.0.0.1:8000\/save\/ (note the trailing slash), or set APPEND_SLASH=False in your Django settings.","Q_Score":0,"Tags":"python,django,django-rest-framework","A_Id":71867046,"CreationDate":"2020-04-03T17:12:00.000","Title":"Django Runtime Error while trying to run server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm collaborating with a group for an assignment we decided to use Django for, however, it seems that if one individual used upercase characters instead of lowercase characters (MyProject vs myproject) for example and therefore I often times get an error indicating\nModuleNotFoundError: No module named 'MyProject'\nI've changed it before & resolved it and then pushed it up to GitHub.. but every so often we encounter the same issue.\nHow can I fix this permanently so that it's no longer an issue?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":271,"Q_Id":61028354,"Users Score":0,"Answer":"I was able to fix this issue by renaming MyProject to myproject within the settings.py file\nThanks!","Q_Score":0,"Tags":"python,django,github","A_Id":61028512,"CreationDate":"2020-04-04T12:51:00.000","Title":"ModuleNotFoundError: No module named 'MyProject'","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"i have created a web scraping project in python with the help of beautiful soup but i want my project to work as a desktop application.\nSo, that i can run that application and can perform web scraping on a specific url.\nIs it possible using python and beautiful soup or i have to make the project in different language?","AnswerCount":4,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":757,"Q_Id":61031816,"Users Score":0,"Answer":"I highly suggest using ElectronJS (check out electronjs.org). \nIf you are proficient enough in HTML\/CSS and some Javascript, you can use those markup languages to easily create a UI (which you would do on a normal website), which would look much better than any interface made using Python GUI libraries (such as tkinter, pygame etc.). \nThe Electron app itself is a browser but it works as a desktop application. It is also cross-platform.","Q_Score":0,"Tags":"python,web-scraping,beautifulsoup","A_Id":61032465,"CreationDate":"2020-04-04T17:13:00.000","Title":"How to convert web scraping python project into desktop application?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"i have created a web scraping project in python with the help of beautiful soup but i want my project to work as a desktop application.\nSo, that i can run that application and can perform web scraping on a specific url.\nIs it possible using python and beautiful soup or i have to make the project in different language?","AnswerCount":4,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":757,"Q_Id":61031816,"Users Score":0,"Answer":"If your intention is how to turn it into an executable you can download pyinstaller.\nIf you want to build a GUI you have a few options:\n\nUse a python module like: pygame, tkinter, PyQt5, wxPython, BeeWare.\nUse an JavaScript framework like electron.js.\nMake a Web-App and use python as a back end with a framework like Flask or Django.","Q_Score":0,"Tags":"python,web-scraping,beautifulsoup","A_Id":61032223,"CreationDate":"2020-04-04T17:13:00.000","Title":"How to convert web scraping python project into desktop application?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am running a python script that runs on startup of Windows 10 due to a shortcut of it being in the startup folder. This script is checking constantly for requirements on whether or not to open a web-page. If a page is launched and chrome has not previously been closed (yes closed, not just opened), the program just \"dies\" and freezes. After debugging my program the loop is no longer running, reading and writing to files stops, and even if another web-page should open ... it doesn't. I'm guessing this is a Chrome issue or a problem with this code windowsChromePath = 'C:\/Program Files (x86)\/Google\/Chrome\/Application\/chrome.exe %s'\nwebbrowser.get(windowsChromePath).open(url)\nAnyone know why this could be?\nEdit: Forgot to mention I have had problems in this same project with read and write. Debugging leads me to believe it's not this, however if you think it could be a read\/write problem it might be","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":29,"Q_Id":61052115,"Users Score":0,"Answer":"Turns out webbrowser \"blocks\" waiting for an exit response from the browser. There is no way to make a non-block call. Use multi threading to run the open as a separate task.\nEdit: Make sure to use try on webbrowser since it returns a connect timeout error by default if the windows is not closed. Except then raise if you really want to see the error.","Q_Score":0,"Tags":"python,windows,google-chrome","A_Id":61070619,"CreationDate":"2020-04-06T02:27:00.000","Title":"~~Running Python Script on Startup That Opens Chrome Causing Unexpected Problems~~ SOLVED Multi-threading","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My device send to serial port every 5 seconds. So, I have two situations for using.\nThe first one, port is open-close every 5 secs, after send data.\nAnd open once time, and use it persistence (Try to check port is opened before using).\nWhich use-case is better?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":54,"Q_Id":61055120,"Users Score":1,"Answer":"You should not open \/ close your serial device every n seconds, because time drifting might make you loose data written to your serial port.\nIn order to keep your program running smootly, why don't you create a new thread which opens the serial port and keeps reading in a while loop ?","Q_Score":0,"Tags":"python,python-3.x,pyserial","A_Id":61055977,"CreationDate":"2020-04-06T07:45:00.000","Title":"Open device with pyserial","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I making a application, in this application you can watch movies and songs. \nFor this i'm using angular for frontend and python\/flask for backend.\nEventually this application will run on a raspberry pi 4, to store the mp4 and mp3 files i'm using a simple usb flash drive. For now i just want it to work on my laptop. So the program needs to know where to get the files from and render them in de html.\nWhat is the best approach to load in the mp3 and mp4 files from that usb to display them in the application?\nOn first hand I just thought to give the path where the usb drive is located and then put that in de audio or video tag. Bu i'm not sure this is the right way.\nDoes anyone know what would be the best approach to do this?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":122,"Q_Id":61060180,"Users Score":0,"Answer":"Hi Ronny here is a simple way to get the path and play using it:\n{{{  import easygui, vlc\nmedia = easygui.fileopenbox(title=\"Choose media to open\") \nplayer = vlc.MediaPlayer(media)\nplayer.play()   }}} \nthis program will ask the path of the folder to you and play the file to you in vlc media player.","Q_Score":0,"Tags":"python,html,angular,typescript,flask","A_Id":61060318,"CreationDate":"2020-04-06T12:45:00.000","Title":"Taking content (mp4 and mp3) from usb drive and use it in a application","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I making a application, in this application you can watch movies and songs. \nFor this i'm using angular for frontend and python\/flask for backend.\nEventually this application will run on a raspberry pi 4, to store the mp4 and mp3 files i'm using a simple usb flash drive. For now i just want it to work on my laptop. So the program needs to know where to get the files from and render them in de html.\nWhat is the best approach to load in the mp3 and mp4 files from that usb to display them in the application?\nOn first hand I just thought to give the path where the usb drive is located and then put that in de audio or video tag. Bu i'm not sure this is the right way.\nDoes anyone know what would be the best approach to do this?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":122,"Q_Id":61060180,"Users Score":0,"Answer":"Various methods and it depends on how you want it done. You can:  \n\nRun a CLI command finding .mp3 files through regex. E.g. find \/media | grep *\\.mp3:\nThis will automatically find all .mp3 files in the folder and subfolders.\nYou can run a CLI command inside your Python script e.g. with the subprocess module. Save all the available paths to a mp3 file in an array and process them further from here.\nYou can code a relative path in your program and mount your USB into your working directory's subfolder audio. mount -o remount,ro \/dev\/sda1 ~\/path\/to\/your\/project\/audio:\nAll the audio files are then located in your audio folder which is part of your project. You can have dummy files in there and when you mount your USB into that folder the USB mp3 files are shown.\nThis approach requires you to manually mount before executing your Python program. It is also in my opinion the cleanest approach.\n\nThe manual mounting on the second approach might become a concern for you but for this there are also solution out there where you can define automatic mount points. However these aren't solved in Python.","Q_Score":0,"Tags":"python,html,angular,typescript,flask","A_Id":61060545,"CreationDate":"2020-04-06T12:45:00.000","Title":"Taking content (mp4 and mp3) from usb drive and use it in a application","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I currently find myself using the bs4\/BeautifulSoup library a lot in python, and have recently been wondering how it works. I would love to see the source code for the library and don't know how. Does anyone know how to do this? Thanks.","AnswerCount":3,"Available Count":2,"Score":0.0665680765,"is_accepted":false,"ViewCount":205,"Q_Id":61062983,"Users Score":1,"Answer":"If you are using any IDE, you can right click on imported line and goto Implementation.\nOtherwise you can find the source code in <python_installtion_path>\\Lib\\site-packages directory.","Q_Score":0,"Tags":"python,beautifulsoup","A_Id":61063107,"CreationDate":"2020-04-06T15:12:00.000","Title":"How can I see the source code for a python library?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I currently find myself using the bs4\/BeautifulSoup library a lot in python, and have recently been wondering how it works. I would love to see the source code for the library and don't know how. Does anyone know how to do this? Thanks.","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":205,"Q_Id":61062983,"Users Score":0,"Answer":"Go to the location where python is installed and inside the python folder, you will have a folder called Lib you can find all the packages there open the required python file you will get the code.\nexample location: C:\\Python38\\Lib","Q_Score":0,"Tags":"python,beautifulsoup","A_Id":61063151,"CreationDate":"2020-04-06T15:12:00.000","Title":"How can I see the source code for a python library?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In Django is there a way to save mobile no, otp and created_time to DB and let DB remove row when the time created_time is more than 10 sec.\n(like time to live)","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":33,"Q_Id":61068585,"Users Score":0,"Answer":"At this time, SQLite does not support that. You best bet would be to implement a background worker, which would delete all the records created more than 10 seconds ago.","Q_Score":0,"Tags":"python,django,database,sqlite","A_Id":61068955,"CreationDate":"2020-04-06T20:38:00.000","Title":"in django delete a row in sqlite3 when the time exceeds","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"A Django web application usually has login required, however there is a url or view that does not need to have a login_required. How to make it work?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":197,"Q_Id":61085966,"Users Score":0,"Answer":"re_path(r'^admin\/', admin.site.urls),\npath('about\/',views.about,name=\"about\"),\nBy default all the admin urls are login protected and if you do not use admin site and if you do not use any login_required decorator in views.py then that url will not be login required just like the \"about\/\" url here.","Q_Score":0,"Tags":"python,django,django-views","A_Id":61086255,"CreationDate":"2020-04-07T17:34:00.000","Title":"How to escape the required login or protection ensured by the middleware in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"so I am working with angular at the moment and I wanted to know if its possible to use Web scraping and providing the information I get to my Angular Webpage.Is there a way to do that and if so is there any good practice you could recommend? Can I combine my Python code or more specific the outcome with my Angular Project? \nThank you very much for helping guys.","AnswerCount":4,"Available Count":2,"Score":0.049958375,"is_accepted":false,"ViewCount":1068,"Q_Id":61099132,"Users Score":1,"Answer":"There are many ways to do this, what I'd recommend for smaller projects is:\n\nSet up lambda functions in AWS that runs your scraping. On lambda you can choose to run node.js, python, and plenty of other languages and frameworks. I prefer selenium with python.\nWith cloudwatch events, set this lambda to scrape every X minutes.\nPut the scraped data into a mongoDB database, made simple with pymongo.\nIn angular, use a server to connect to the mongodb database.\n\nYou can set up your website on heroku.com for free, and add a DB from there. I have used this setup for hittavaran.com","Q_Score":1,"Tags":"python,angular,web-scraping","A_Id":61099326,"CreationDate":"2020-04-08T11:00:00.000","Title":"Web crawling and providing the data to my Angular Webpage","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"so I am working with angular at the moment and I wanted to know if its possible to use Web scraping and providing the information I get to my Angular Webpage.Is there a way to do that and if so is there any good practice you could recommend? Can I combine my Python code or more specific the outcome with my Angular Project? \nThank you very much for helping guys.","AnswerCount":4,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":1068,"Q_Id":61099132,"Users Score":0,"Answer":"Angular is a front-end framework.\nIf you want to display the same scraped data to all users, you should use a back-end framework that your angular app can request the data from.\nThere are many options for frameworks in python, such as flask, to start up an interface that any front-end application can request data from.","Q_Score":1,"Tags":"python,angular,web-scraping","A_Id":61099218,"CreationDate":"2020-04-08T11:00:00.000","Title":"Web crawling and providing the data to my Angular Webpage","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm still pretty new to this web dev. I have been having trouble accessing the django admin site. I'm able to do localhost:8000 just fine.\nIf I do localhost:8000\/admin, I'm directed to the admin login page. I have already created id\/pw through createsuperuser. \nAnyway, once I type in my id and pw, I noticed my dev server (localhost or 127.0.0.1) terminates and the login page will throw me an error saying \"this site can't be reached\" with ERR_CONNECTION_REFUSED.\nI've tried turning off my internet\/firewall, but it still gave me the same result. \nI would greatly appreciate your help. I've been having so much trouble with this because I can't access the django admin site...\n(i'm using macOS Catalina, if that's any useful. Also I'm just following the basic Django tutorials, so i'm not using anything like gunicorn or nginx either.\n)\nThanks.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":828,"Q_Id":61115228,"Users Score":0,"Answer":"Based on the limited info:\n\nTry to access 127.0.0.1:8000\/admin instead of localhost:8000\/admin.\nIn django's settings set ALLOWED_HOSTS = ['*'] (NOTE: This is only for development).\nCheck if something else is not already runnning on that port. You can use the following command on Mac lsof -Pn -i4 | grep -i \"listen\".","Q_Score":1,"Tags":"python,django,web,localhost","A_Id":61115349,"CreationDate":"2020-04-09T06:31:00.000","Title":"Can't log into localhost:8000\/admin ... ERR_CONNECTION_REFUSED","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Python algorithm that can be parallelized fairly easily.\nI don't have the resources locally to run the whole thing in an acceptable time frame.\nFor each work unit, I would like to be able to:\n\nLaunch an AWS instance (EC2?)\nSend input data to the instance\nRun the Python code with the data as input\nReturn the result and aggregate it when all instances are done\n\nWhat is the best way to do this?\nIs AWS Lambda used for this purpose? Can this be done only with Boto3?\nI am completely lost here.\nThank you","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":729,"Q_Id":61126183,"Users Score":0,"Answer":"A common architecture for running tasks in parallel is:\n\nPut inputs into an Amazon SQS queue\nRun workers on multiple Amazon EC2 instances that:\n\n\nRetrieve a message from the SQS queue\nProcess the data\nWrite results to Amazon S3\nDelete the message from the SQS queue (to signify that the job is complete)\n\n\nYou can then retrieve all the results from Amazon S3. Depending on their format, you could even use Amazon Athena to run SQL queries against all the output files simultaneously.\nYou could even run multiple workers on the same instance if each worker is single-threaded and there is spare CPU available.","Q_Score":1,"Tags":"python,multithreading,amazon-web-services,parallel-processing,cloud","A_Id":61132717,"CreationDate":"2020-04-09T16:49:00.000","Title":"Run parallel Python code on multiple AWS instances","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an Google App Engine Standard (Python 3) application that I've secured behind Google IAP. This works great! But now I need a handful of web hook urls to be public, so other services can hit them, like SendGrid. Is there a solution to this that I am not seeing?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":96,"Q_Id":61127248,"Users Score":2,"Answer":"As Ahmad suggested, the solution is to have a separate App Engine service that is publicly accessible.","Q_Score":1,"Tags":"google-app-engine,google-app-engine-python,google-iap","A_Id":61191098,"CreationDate":"2020-04-09T17:54:00.000","Title":"Is it possible to protect an App Engine application with IAP while having a few public URLs?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'n new to django and I'm practicing through Django's Documentation on setting up my first project. \nAll worked well until it asked to invoke the Python shell with the command python manage.py shell\nAs a result, nothing really happens apart from showing the following text:\nPython 3.7.1 (v3.7.1:260ec2c36a, Oct 20 2018, 14:05:16) [MSC v.1915 32 bit (Intel)] on win32\nType \"help\", \"copyright\", \"credits\" or \"license\" for more information.\n(InteractiveConsole)\nCould someone please help? I tried finding an answer in very different sources but no one has really answered it. Thank you in advance.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":440,"Q_Id":61144697,"Users Score":1,"Answer":"That is what exactly happens. Just start typing in shell you can see the result.\nDo not expect any other screen to open.\nIf you want to exit from shell use exit() command.\nI hope that helps.\nThank you.","Q_Score":0,"Tags":"python,django","A_Id":61144874,"CreationDate":"2020-04-10T16:39:00.000","Title":"python manage.py shell nothing happening","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"i've got selenium to run and hit 2 sub categories via the X PATH already which are buttons and now i keep receiving the error above here again - \nole=\"button\">... is not clickable at point (555, 55). Other element would receive the click: ...\n  (Session info: chrome=80.0.3987.163)\nmy code looks like this \n\"#More Faq page sub-categories\ntime.sleep(3)\nWaysToWatch = driver.find_element_by_xpath('\/\/*[@id=\"main\"]\/div\/div\/section\/div\/div[2]\/a')\nWaysToWatch.click()\n\"#Set-pin - THIS ONE DOESN'T WANT TO WORK \ntime.sleep(5)\nSetPin = driver.find_element_by_xpath('\/\/*[@id=\"main\"]\/div\/div\/section\/div\/div[3]\/a')\nSetPin.click()\nI would appreciate a fix as I have quite a few of these I need to run through","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":90,"Q_Id":61149695,"Users Score":0,"Answer":"driver.find_element_by_tag_name('body').send_keys(Keys.HOME) \nUse send_keys(Keys.HOME) to scroll up to the top of page","Q_Score":1,"Tags":"python,selenium-webdriver","A_Id":61247397,"CreationDate":"2020-04-10T22:40:00.000","Title":"Python how to click multiple sub categories, get this error button\">... is not clickable at point (555, 55) Other element would receive the click","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Normally, I know tuple can be used as\n(email, username) = ('hello', 'user')\nthat email will be equal to hello\nBut I am wondering if I can do something like\n(email, username) = request.user so I do  not have to keep on typing request.user and instead just use email and username like how javascript works.\nif I did the above, I would get an error saying TypeError: object is not iterable\nThanks in advance for any suggestions and advices.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":56,"Q_Id":61156904,"Users Score":1,"Answer":"The destructuring mechanism in python works with a \"positional\" manner (as you have used it in (email, username) = ('hello', 'user').\nIt does not work in a \"named\" manner, as you have tried in (email, username) = request.user, as javascript do.","Q_Score":1,"Tags":"javascript,python,django,destructuring","A_Id":61158166,"CreationDate":"2020-04-11T12:35:00.000","Title":"possible to use tuple, deconstruct with request.user, django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"When i am trying to attach results using create_test_result_attachment api, getting error message \"msrest.exceptions.ClientRequestError: Error occurred in request., RetryError: HTTPSConnectionPool(host='dev.azure.com', port=443): Max retries exceeded with url: \/itron\/4fc412f1-9337-4c85-8aaf-7955d066a31c\/_apis\/test\/Runs\/3878830\/Results\/100000\/Attachments (Caused by ResponseError('too many 500 error responses',))\"\ncode:\nreport ='\/\/home\/\/shweta\/\/Desktop\/\/test.html'\nwith open(report, 'rb') as f:\nencoded_string = base64.b64encode(f.read()).decode('ascii') test_client = self.connection.get_client(TEST_CLIENT)\nTest_Attachment_Request_Model={\n'attachment_type': 'GeneralAttachment',\n'comment': 'attach report',\n'file_name': report,\n'stream': encoded_string\n}\nres = test_client.create_test_result_attachment(Test_Attachment_Request_Model, project, run_id, test_case_result_id)\nprint(res)\nError: msrest.exceptions.ClientRequestError: Error occurred in request., RetryError: HTTPSConnectionPool(host='dev.azure.com', port=443): Max retries exceeded with url: \/itron\/4fc412f1-9337-4c85-8aaf-7955d066a31c\/_apis\/test\/Runs\/3878830\/Results\/100000\/Attachments (Caused by ResponseError('too many 500 error responses',))","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":90,"Q_Id":61164468,"Users Score":0,"Answer":"Able to resolve it.. Issue was with file_name. Instead of passing report, needed to extract the html file and it worked. Added code: filename = Path(report).name with open(report, 'rb') as f: encoded_string = base64.b64encode(f.read()).decode('ascii') test_client = self.connection.get_client(TEST_CLIENT) Test_Attachment_Request_Model={ 'attachment_type': 'GeneralAttachment', 'comment': 'attach report', 'file_name': filename, 'stream': encoded_string }","Q_Score":0,"Tags":"azure-devops,automated-tests,python-3.6,azure-devops-rest-api","A_Id":61169513,"CreationDate":"2020-04-11T22:22:00.000","Title":"Can't add an attachment in a result of run using create_test_result_attachment for v6.0 api","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have installed the module alpha_vantage using pip. In CMD writing import alpha_vantage does not show an error message, so I assume it is installed properly. \nHowever, when trying to import alpha_vantage in a python program I get this error: \"ModuleNotFoundError: No module named 'requests'\". I assume the issue is due to the location of the module.\nThe project is located here:\nC:\\Users\\M\\Documents\\Python\\Investering.\nI tried placing the module here by pip: C:\\Users\\M\\Documents\\Python\\Investering\\modules\\alpha_vantage\nNote pip did not install the module there I simply copied the module folder and placed them in the project folder. \nIs it possible to simply copy and paste module folders in other projects? Or how am I supposed to make python acknowledge the module? \nThe module was installed here:\nC:\\Users\\M\\AppData\\Local\\Programs\\Python\\Python38-32\\Lib\\site-packages\\alpha_vantage\nI'm quite new to python. I have tried adding to sys.path the folder where the module was installed, but it did not seem to help. \nThanks for any help. \nEdit: I tried pip install requests and it produced this: \nRequirement already satisfied: requests in c:\\users\\martin\\appdata\\local\\programs\\python\\python38-32\\lib\\site-packages\nSomeone mentioned running: \"pip install foo\"\nIt, however, produces this error message: \nERROR: Could not find a version that satisfies the requirement foo (from versions: none) ERROR: No matching distribution found for foo\nI am using PyCharm.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":225,"Q_Id":61177266,"Users Score":0,"Answer":"I found my error. I had installed python from the website, but had unknowningly installed the 32 bit version, and a 64 bit version. I uninstalled all my python versions and pycharm. Then I reinstalled everything. Now I could easily make the module work. Thanks for the pointers.","Q_Score":0,"Tags":"python,module","A_Id":61190478,"CreationDate":"2020-04-12T19:51:00.000","Title":"ModuleNotFoundError using pip","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am facing an unusual use-case with React and Django. My process starts with a POST request initiated by an app running on user's system to my Django server(The response is displayed on the browser). The POST request contains the data required for authenticating the user. Once authenticated, the server returns a simple HTML page customized for that user, including the details necessary to authenticate subsequent requests(like form submissions). Now I need to replace that simple HTML page with a react application. The problem is how can I embed the user specific info into the react app when returning the react app from server, so that I don't have to ask user to provide authentication information again once application loads on browser. Is this even possible while using react?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":52,"Q_Id":61177747,"Users Score":0,"Answer":"Considering that you returns properties of user from server side, you could use React to render the components into the page conditionally, based on the properties that was received from server side.","Q_Score":1,"Tags":"python,django,reactjs,single-page-application,server-side-rendering","A_Id":61178387,"CreationDate":"2020-04-12T20:30:00.000","Title":"React SPA with initial state\/route, served from Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"The environment variables are cleared when you exit the terminal and it is required that we need to set them again when we launch the terminal.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":45,"Q_Id":61182525,"Users Score":1,"Answer":"In vs code using bash in Ubuntu, if that is the case, look for setting the env variables in the .bash_profile so that it remembers the variables even after the terminal program is closed.","Q_Score":0,"Tags":"python,flask,visual-studio-code,terminal","A_Id":61182557,"CreationDate":"2020-04-13T06:24:00.000","Title":"Set environment variables in FLASK","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've installed the package Pillow outside the virtual environment created using pipenv. But when I try to make migrations for my django project in this environment, it says Pillow is not installed and asks to install it. I think I installed pillow globally but it is not accessible by the pipenv virtual environment. I'm using python 3.8 and use sublime3 as editor.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":1118,"Q_Id":61211746,"Users Score":1,"Answer":"Packages installed globally are not available in a virtual environment.\nYou can install django using command python -m pip install Django.\nList all installed packages available using pip list.","Q_Score":3,"Tags":"python,django,sublimetext3,pipenv,virtual-environment","A_Id":61350103,"CreationDate":"2020-04-14T15:45:00.000","Title":"I installed a package outside virtual environment but cannot use it in the virtual environment","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am finding a TemplateDoesNotExist at\/ error when running a Django project in local host using python manage.py runserver). The django app works perfectly in my development machine (Windows 10). The error is in the deployment server machine (Windows Server 2016).  \nAny idea of what can be wrong having same Project code, Django and Python versions?\nThanks!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":23,"Q_Id":61216939,"Users Score":0,"Answer":"Changed Python version from Python 3.6.7 to Python 3.6.8 and it worked OK!","Q_Score":0,"Tags":"python,windows,django-templates","A_Id":61236141,"CreationDate":"2020-04-14T20:46:00.000","Title":"Django Template does not exist: Same code and software in different machine","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In my login First place I wanted to send OTP and second place I wanted to verify the OTP and then return the token.\nI am using rest_framework_simplejwt JWTAuthentication. First place I am verifying the user and sending the OTP, not returning the token and second place I am verifying the OTP and returning the token.\nLet me know If this is the correct way to use? If not how can I implement this using JWTAuthentication.\nOR If this is not correct way to use, can I implement like first place use Basic authentication to verify the user and second place jwt authentication to verify the OTP and send the tokens. Let me know your solution.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":231,"Q_Id":61222312,"Users Score":0,"Answer":"What I understood?\nYou need to send an OTP to the current user who is hitting your send_otp route after checking if the user exists or not in your system and then verify_otp route which will verify the OTP that the user has sent in the API alongwith it's corresponding mobile_number\/email_id.\nHow to do it?\n\nsend_otp - Keep this route open, you don't need an authentication for this, not even Basic Auth (that's how it works in industry), just get the mobile_number from the user in the request, check whether it exists in the DB, and send the OTP to this number, and set the OTP to the corresponding user in your cache maybe for rechecking (redis\/memcache). Use throttling for this route so that nobody will be able to exploit this API of yours.\nverify_otp - This route will also be open (no authentication_class\/permission_classes), get the mobile_number\/email id + OTP from the user, verify it in cache, if verified, generate the token using TokenObtainPairSerializer and send the refresh + access token in the response, if the OTP is incorrect, send 401.","Q_Score":1,"Tags":"django,python-3.x,django-rest-framework,jwt,django-rest-framework-jwt","A_Id":61266385,"CreationDate":"2020-04-15T06:06:00.000","Title":"Can I use JWTAuthentication twice for a login authentication?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have 2 instances of Odoo 13 Enterprise in the same server under linux. The first instance is production instance. The customers can connect with it with his mobiles with Odoo app. This instance works fine. The second instance is used to try new modules before put it in production instance. The problem is when I send notifications on development instance the customer get this notifications on his mobiles, and this notifications seems like production instance notification. \nImportant notes: Production instance is under Nginx proxy and have domain, but development instance haven't.\nI'm looking for some forgoten setting, but I didn't see any mistake.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":66,"Q_Id":61229361,"Users Score":0,"Answer":"I fixed this issue uninstalling module ocn_client. This module cache some dependencies and send gosth notifications.","Q_Score":0,"Tags":"python,linux,odoo,odoo-13,odoo-enterprise","A_Id":61253677,"CreationDate":"2020-04-15T12:58:00.000","Title":"Gosth notifications in Odoo 13 EE","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am using flask security to login to my admin panel. It was using the email and password just fine, but recently the login is requiring the id instead of the email. As far as I know the default behavior is to use the email column. When investigating I found that the SQL query is trying to use the id in the where clause instead of the email. My models are set up correctly with peewee so I am confused as to what is going on.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":33,"Q_Id":61232849,"Users Score":1,"Answer":"It was a peewee version problem. The newest version breaks flask-security.","Q_Score":2,"Tags":"python,flask-admin,flask-peewee","A_Id":61238305,"CreationDate":"2020-04-15T15:43:00.000","Title":"Flask Security Is using id instead of email in where clause","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"What is the difference between django rest framework's Serializer vs ModelSerializer? When do you one or the other? Can I use ModelSerializer for Auth? Thanks a lot for the help.","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":3017,"Q_Id":61237790,"Users Score":4,"Answer":"the Django rest framework serializer is the normal serializer that will be used when building an API with Django. It simply parses data from complex types into JSON or XML. \nThe model serializer is just the same as the above serializer in the sense that it does the same job, only that it builds the serializer based on the model, making the creation of the serializer easier than building it normally.","Q_Score":3,"Tags":"python,django,django-rest-framework","A_Id":61266030,"CreationDate":"2020-04-15T20:11:00.000","Title":"What is the difference between Serializer and ModelSerializer","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"What is the difference between django rest framework's Serializer vs ModelSerializer? When do you one or the other? Can I use ModelSerializer for Auth? Thanks a lot for the help.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":3017,"Q_Id":61237790,"Users Score":0,"Answer":"When you are dealing with Microservice and web services if you want to connect your web services with clients so then you have to use a serializer with whatever the data you mentioned in the model in microservices, so it makes it easy for us to carry the data from client-side. In Microservice you used Modelserializer to create serializer but in Webservice you only use serializer.","Q_Score":3,"Tags":"python,django,django-rest-framework","A_Id":70077436,"CreationDate":"2020-04-15T20:11:00.000","Title":"What is the difference between Serializer and ModelSerializer","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am just getting started on a web2py tutorial. I have downloaded the web2py Windows binaries, extracted the files and am simply trying to start by opening web2py.exe\nWhen i double click the icon a black command prompt looking window opens up but then closes immediately, and the web2py Web Framework window does not open as it is supposed to.\nNot sure if this is important but I have Python 3.7 installed, do not have any 2.x version installed, but web2py.com does not mention that any of this is needed, it should load up right out of the box. I have searched extensively and do not see anyone else with the same issue. I have tried restarting my computer, deleting and re-downloading the web2py zip folder, but nothing changes.\nEdit: Tried opening application from command prompt, same result.\nAlso I have now tried it on two different Windows machines (one work, one personal) and had the same issue.","AnswerCount":4,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":298,"Q_Id":61238173,"Users Score":0,"Answer":"i recommend you to use source code version. It's more flexible to use across any platforms.","Q_Score":0,"Tags":"python,web2py","A_Id":61647264,"CreationDate":"2020-04-15T20:36:00.000","Title":"Web2Py.exe Will Not Open","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am building my first Django app and using the Django templating engine in my html files. I have the html and Django html plugin in VSCode.\nSo far, it autocompletes html elements and colorizes the Django templates. \nIs there a way to autocomplete {% %} when using the Django HTML language mode in VSCode?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":436,"Q_Id":61240473,"Users Score":0,"Answer":"You can you the django-Intellisense VSCode extension to provide autocomplete for all dynamic properties generated by Django.","Q_Score":1,"Tags":"python,django,python-3.x,django-templates,jinja2","A_Id":61240537,"CreationDate":"2020-04-15T23:53:00.000","Title":"Keyboard shortcut for {% %} in VSCode using Django HTML","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Jenkins job that executes a python script. I would like to return a png of a figure so that I can see it in the Jenkins Build information. Is this possible?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":78,"Q_Id":61249556,"Users Score":0,"Answer":"I imagine this to be possible in the following way:\n\nEnable (safe) HTML for Jenkins Build descriptions\nEnter some html that performs a GET request to a path (let's call this X)\nSet up a mini (Python, Flask?) server that serves this path X, and returns the png image from the correct workspace","Q_Score":0,"Tags":"python,jenkins","A_Id":61249643,"CreationDate":"2020-04-16T11:52:00.000","Title":"Return png. file from a Jenkins Build","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am building a Django project with a postgresql in it. This databasa has to be populated from an API. This database doesn't have to be updated.\nAs I understood, the tables inside my database have to be created in my Django models. But where should I populate it? \nIn a script outside Django or inside my app views?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":681,"Q_Id":61260062,"Users Score":3,"Answer":"I did find a way to populate my DataBase from Django itself. I added a custom populate_db command in managment\/command that runs a scritp that populate my DataBase from an external API.\nThen I just have to run  python3 manage.py populate_db","Q_Score":2,"Tags":"python,django,postgresql,django-models","A_Id":61300803,"CreationDate":"2020-04-16T21:07:00.000","Title":"Populate a DataBase from an API in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have made a web application that uses Google Sheets as a database. I want to upload my project on github. But since it uses google sheets API  for fetching data, I was wondering if is it safe to upload because I will also have to upload API credentials as well?\nI have seen a lot of questions like this on Stack Overflow but none of them addressed this question clearly. Also, my application\/database is nothing confidential or anything like that. My only concern is if uploading API credentials can cause any harm to my google account?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":43,"Q_Id":61262038,"Users Score":2,"Answer":"You should never upload private\/secret credentials to a public forum like GitHub.\nThere will always be people looking to exploit free credentials like that and it's impossible to know the damage that could be caused.  What if someone deletes data on your account? What if they spam calls and get your account suspended?  \nThe best practice is to put some kind of placeholder in the code that you put on GitHub and add a section to the ReadMe explaining where the credentials need to be provided.","Q_Score":1,"Tags":"python,django,github,google-sheets-api","A_Id":61262110,"CreationDate":"2020-04-16T23:56:00.000","Title":"Can we upload google sheets api credentials on github?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How do I force the user to complete a form before allowing them to move to other routes in Flask.\nI wanted to avoid creating user logins as I didn't want to create a database for individual users. I just wanted to force any user to complete a form before getting access to other urls in the flask applications.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":37,"Q_Id":61262698,"Users Score":0,"Answer":"You can use sessions to store data from the form. Then in each route check if the sessions contains data. If it doesn't it means that the user hasn't completed the form. If so then redirect the user to the form route","Q_Score":0,"Tags":"python,flask","A_Id":61263503,"CreationDate":"2020-04-17T01:25:00.000","Title":"Forcing users to complete form in Flask","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I use python boto3\nwhen I upload file to s3,aws lambda will move the file to other bucket,I can get object url by lambda event,like\nhttps:\/\/xxx.s3.amazonaws.com\/xxx\/xxx\/xxxx\/xxxx\/diamond+white.side.jpg\nThe object key is xxx\/xxx\/xxxx\/xxxx\/diamond+white.side.jpg \nThis is a simple example,I can replace \"+\" get object key, there are other complicated situations,I need to get object key by object url,How can I do it?\nthanks!!","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":984,"Q_Id":61265226,"Users Score":1,"Answer":"You should use urllib.parse.unquote and then replace + with space.\nFrom my knowledge, + is the only exception from URL parsing, so you should be safe if you do that by hand.","Q_Score":0,"Tags":"python,amazon-web-services,amazon-s3,aws-lambda,boto3","A_Id":61267789,"CreationDate":"2020-04-17T06:16:00.000","Title":"how to get s3 object key by object url when I use aws lambda python?or How to get object by url?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Am working on a project where i need to gather information from different websites ( Internal to company) and also few information from an windows  application developed in Java.\nI was able to pull all the information from websites using Selenium\/Python, now I have an Window application where i need to fetch some information. Since selenium is not supporting Window application am not able to continue with that. I tried using AutoIt but my application is developed on JAVA and autoit windows spy is not able to detect many buttons on the application.\nAny suggestion\/Idea based on your experience how to proceed further ?\nI have 80% of my information in websites which I have already scripted to pull only pending is this applications.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":212,"Q_Id":61269426,"Users Score":1,"Answer":"If the Java application is using DB (it almost certainly does) you can try getting the data from there directly instead of extracting it from the GUI.","Q_Score":0,"Tags":"python,selenium,user-interface,autoit","A_Id":61285451,"CreationDate":"2020-04-17T10:29:00.000","Title":"Python\/Selenium code to open an application and login ( GUI Automation)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was reading regarding the memory allocation in python and was wondering if I have java and python installed in the same computer system then does java and python use the same stack and heap or they have different stack and heaps allocated for them in the RAM? \nCan anyone please help me to clear my doubt.\nThanks in Advance.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":58,"Q_Id":61271540,"Users Score":0,"Answer":"Two different programs never use the same heap. They each, get a portion of virtual address space, that can overlap in numbers somehow, but these are independent. When a program actually needs pages to be in RAM - it allocates them, in a lazy fashion, usually by 4KB ( might be bigger ). This is done via a Page Table, which is able to map virtual address space to phisycal one ( potentially swap too ). \nYou probably need to understand that you do not require everything, all the time in RAM. Your code can do a little portion, then give that space in RAM to someone else, or even swap out.","Q_Score":0,"Tags":"java,python,memory-management,stack,heap-memory","A_Id":62001513,"CreationDate":"2020-04-17T12:20:00.000","Title":"Does two languages use the same stack and heap on the ram?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was reading regarding the memory allocation in python and was wondering if I have java and python installed in the same computer system then does java and python use the same stack and heap or they have different stack and heaps allocated for them in the RAM? \nCan anyone please help me to clear my doubt.\nThanks in Advance.","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":58,"Q_Id":61271540,"Users Score":1,"Answer":"Even if it is an implementation detail, each thread on a system has its own stack. The heap is an image from the 70's segmented model and has no sense on any process except Java ones on a modern OS: when a process requires more memory it just asks the kernel for it and has no preallocated heap. In a sense all processes in a system (except for Java ones) share the same available memory pool, but it not what was called a heap.\nJava is different, because a Java program executes in a JVM, and the JVM has its allocated memory and the process cannot require memory from the system. So in a JVM, the whole process has a heap, and each thread has a stack. And if you launch 2 independant Java programs, you will have 2 independant JVM each with its own heap.","Q_Score":0,"Tags":"java,python,memory-management,stack,heap-memory","A_Id":61271918,"CreationDate":"2020-04-17T12:20:00.000","Title":"Does two languages use the same stack and heap on the ram?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"This question doesn't involve any code. I just want to know a way to run multiple instances of a django app and if it is really possible in the first place.\nI make django apps and host them on Apache. With the apps, I noticed a conflict between multiple users accessing the web app. \nLet us assume it is a web scraping app. If one user visits the app and run the scraper, the other user accessing the site from a different location doesn't seem to be able to visit the app or run the scraper unless the scraping that the first user started finishes. \nIs it really possibe to make it independent for all different users accessing the app?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":483,"Q_Id":61276070,"Users Score":0,"Answer":"There are a few ways you could approach this. You might consider putting your app into a container (Google search: docker {your stack}) \nThen implement something like Docker Swarm or Kubernetes to allocate multiple instances of your app. \nThat being said, you might consider how to refactor your app to allow multiple users. It sounds like your scraping process locks things. But in reality, there's no reason your server should lock up during this. \nIt might be better to create your app so that when it received a request, like someone visiting the site, the server pays out the requested web page. When a user asks for a scrape\/task to run, the server calls your scaper service or script asynchronously. \nThat way your app can still function while a scrape is in progress. This would be MUCH more resource efficient (and likely simpler) than spinning up tens or hundreds of instances of your entire app.\ntl;Dr: containerization for multiple instances \nRefactor app so a single user can't threadlock it.","Q_Score":1,"Tags":"django,python-3.x","A_Id":61276150,"CreationDate":"2020-04-17T16:15:00.000","Title":"How to run multiple instances of a Django app?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Django project and API view implemented with the Rest framework. I'm caching it using the @cache_page decorator but I need to implement a cache invalidation and I'm not seeing how to do that - do I need a custom decorator? \nThe problem: \nThe view checks the access of the API KEY and it caches it from the previous access check but, if the user changes the API KEY before the cache expires, the view will return an OK status of the key that no longer exists.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":465,"Q_Id":61277009,"Users Score":0,"Answer":"Yes, you'll need a cache decorator that takes the authentication\/user context into account. cache_page() only works for GET requests, and keys based on the URL alone.\nBetter yet, though, \n\nDon't use a cache until you're sure you need one\nIf you do need it (think about why; cache invalidation is one of the two hard things), use a more granular cache within your view, not cache_page().","Q_Score":0,"Tags":"python,django,api,django-rest-framework","A_Id":61277084,"CreationDate":"2020-04-17T17:10:00.000","Title":"Django REST Cache Invalidation","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Let me explain with an example.\nLike when we first open www.coursera.org we get to their homepage. Then we login. After we login the session starts and we are redirected to main course dashboard. but if we see URl it is www.coursera.org so now the home route has chanmged from homepage to say dashboard. \nNow in django i can redirect to project.com\/dashboard from project.com\/login but what i want is after login the user should not have access to homepage at any route.\nSo i want to change project.com\/   which before login showed homepage to now showing the dashboard view simply change the view function linked to project.com\/ route\nI hope I explained my question correctly. \nThank you for help in advance","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":219,"Q_Id":61279541,"Users Score":0,"Answer":"I don't think its easily doable in urlconf. If you use function based views, just check if user is authenticated and if he is, then call the view function for dashboard, if not then display the front page. \nFor CBVs probably use UserPassesTestMixin and set the test_func to redirect authenticated users to dashboard.","Q_Score":0,"Tags":"python,django,web,web-applications","A_Id":61280310,"CreationDate":"2020-04-17T19:48:00.000","Title":"How do I change some routes in Django Project after login?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have written a program which reads a text file line by line containing links to pdf files which then downloads the file, split all the pages into another pdf and then covert it to jpeg format. I am now asked to add a pause\/resume functionality to the same. The sequence is it first reads one line then download from the link then split the pdf to pdf of pages then makes images of all the pages then go to another loop, the problem is we don't know the data size and have to further work on the images so we have to pause the program in-between and have to resume after sometime, it can be an hour, 4 hours or even more, please help. It has to start and stop on user command at any point and time when user like.\nThanks in advance","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":72,"Q_Id":61283518,"Users Score":0,"Answer":"A quick update:- Haven't found the exact way for integrating pause\/resume functionality to the script. But did a workaround i.e., Created a log file after downloading pdf file creating images of all the pages of the file and wrote the link in the log file. In the starting of the program, I am comparing the two files i.e., log file and the file containing links and then looping through the difference and downloading file. So, when I stop the function and start it again it will compare links which are in log file(For which the process is completed i.e., images of all the pages is created) and in the file containing all the links and start downloading from the link for which the process was interrupted. Please do let me know if there is a better approach or the pause\/resume functionality is present.","Q_Score":0,"Tags":"python,python-3.x,image,pdf,jupyter-lab","A_Id":61306714,"CreationDate":"2020-04-18T02:27:00.000","Title":"How to integrate a user command-based Pause\/Resume script in Jupyter Notebook?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"i am new in python learning.after learning python basics i have moved to learn python web framework Django. for this \n\ni followed these steps for installing django on my windows after installing python 3.7\n\nfirst i opens cmd command prompt (C:\\users\\mypcname)\nthen i  created virtual environment wrapper with command pip install virtualenvironmentwrapper-win\nthen i created virtual environment with command mkvirtualenv test \nthen i entered command workon test to enable virtual environment \nthen tried to install django with command pip install django and its successfully installed \nthen i created projects directory with command mkdir djangoprojects\nthen i created app directory in djangoprojects(which i created in last step) with command django-admin startproject firstproject\nthen i moved to firstproject with command cd..\nthere i tried to run server with command python manage.py runserver and got error \n\n\nTraceback (most recent call last):   File \"manage.py\", line 10, in\n  main\n      from django.core.management import execute_from_command_line ModuleNotFoundError: No module named 'django'\nThe above exception was the direct cause of the following exception:\nTraceback (most recent call last):   File \"manage.py\", line 21, in\n  \n      main()   File \"manage.py\", line 12, in main\n      raise ImportError( ImportError: Couldn't import Django. Are you sure it's installed and available on your PYTHONPATH environment\n  variable? Did you forget to activate a virtual environment?\n\n\ncan anyone guide me what i have done here wrong  ? why its showing error","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1858,"Q_Id":61286746,"Users Score":1,"Answer":"i got solution by myself. actually i had downloaded python twice with different versions also i had downloaded python   with anaconda package. i uninstalled all python versions and anaconda from my computer then i reinstalled python from his official website. then i tried above method which works fine.thanks to myself","Q_Score":3,"Tags":"python,django","A_Id":61327856,"CreationDate":"2020-04-18T09:12:00.000","Title":"ModuleNotFoundError: No module named 'django' while running server in virtual environment","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm planning on using Django with ReactJS to build a GUI for a complicated database. In order to have features such as auto-completing searching for particular fields, etc, I suppose that using JavaScript is necessary. Is there a way to reuse the models that I made in Python so I don't have to repeat a bunch of code in writing the Django serializers for a REST API and in the models in ReactJS?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":44,"Q_Id":61294273,"Users Score":0,"Answer":"So, as far as I understand, you should create an API, so that your front-end can communicate with your backend. If that is the case, then you do not have to use again any of your models, you will just send a response with the data that you want for each endpoint.\nI hope that helps, please let me know if I misunderstood your question.","Q_Score":0,"Tags":"python,django,reactjs,database,rest","A_Id":61294418,"CreationDate":"2020-04-18T18:34:00.000","Title":"Does Full-Stack Web Development Violate DRY?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm planning on using Django with ReactJS to build a GUI for a complicated database. In order to have features such as auto-completing searching for particular fields, etc, I suppose that using JavaScript is necessary. Is there a way to reuse the models that I made in Python so I don't have to repeat a bunch of code in writing the Django serializers for a REST API and in the models in ReactJS?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":44,"Q_Id":61294273,"Users Score":0,"Answer":"After talking with others who know more than I, I am letting the React frontend be fairly minimal: it will know how to display the data sent to it via Django Channels json packets. The Django backend will handle all the rest (including much of the logic of knowing which pages are accessible from various parts of the database). Thus, the frontend will need minimal knowledge of the structure of the database, and that will preserve the DRY principle.","Q_Score":0,"Tags":"python,django,reactjs,database,rest","A_Id":61414895,"CreationDate":"2020-04-18T18:34:00.000","Title":"Does Full-Stack Web Development Violate DRY?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a somewhat complicated html file and some css styling for it, for example I need to use display: flex and I have some custom fonts, font sizes and font styles.\nAll of this styling stuff is done with css classes.\nCan I convert this html\/xhtml file to a pdf\/epub file with the same formatting? I would prefer a python\/node package or a command line tool.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":255,"Q_Id":61298098,"Users Score":0,"Answer":"You can only use CSS2 styles for pdf\/epub","Q_Score":0,"Tags":"python,html,css,node.js,pdf","A_Id":61298282,"CreationDate":"2020-04-19T00:34:00.000","Title":"Converting a html\/xhtml file with css to pdf\/epub without loosing any of the styling","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to Spyder after VS Code and now want to open my Django project folder. I'm following these steps:\nProjects > New project > Existing directory > Create but Spyder opens some temp.py which after closing opens untitled0.py,untitled1.py,untitled2.py and so on. How can I see my project structure, files as in VS Code ?","AnswerCount":1,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":7665,"Q_Id":61309159,"Users Score":7,"Answer":"On the right side of IDE there is a window containing some subwindows like IPython console, Variable explorer, Help and so on. We are clicking on Files and see our project folder.","Q_Score":9,"Tags":"python,django,spyder","A_Id":61312353,"CreationDate":"2020-04-19T17:59:00.000","Title":"How to open a project folder in Spyder IDE?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to develop a monolithic Django application with Uncle Bob's clean architecture. The problem is I don't want to miss the powerful abilities of Django ORM but this will make a confusion at the same time. The ORM will handle the repository and data layer of application but at the same time makes problem in DTO because I don't want to transfer objects of type Django model.\nShould I create a port to convert Django model objects into plain old Python objects? I think Django is not much suitable for integrating with clean architecture. I mean for a monolithic large scale application Django will have many down sides.","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":1561,"Q_Id":61330495,"Users Score":2,"Answer":"When you talk about Clean architecture, are you talking about hexagonal architecture ? If yes, your question is not only related to Django but to all languages.\nThe fundamental principle about the domain is that it should not have any dependencies. Given this principle, if a DTO is used by the ORM, it is very likely that you will have to do the mapping ORM Entities <-> Domain Model\nWhatever the framework, and therefore the ORM that you use, it must not be imported into the domain which must remain agnostic in relation to everything and must therefore be coded in plain old language objects.","Q_Score":3,"Tags":"python,django,oop,clean-architecture","A_Id":61545006,"CreationDate":"2020-04-20T19:28:00.000","Title":"integrating clean architecture with ORM","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I run an app and from the app it directs me to chrome for login. After which I give my email and password and then after successful login I get redirected to app. Now the question is in case I need to run it again I need to manually clear the cache and free up space every time login happens and this does not allow me to run all codes in one stretch. Can you please let me know is there a way to automate clearing cache and free up space using python and appium.I run my code on ubuntu os platform.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":208,"Q_Id":61337086,"Users Score":0,"Answer":"Add adb shell pm clear packageName to your test file wherever you need and try","Q_Score":0,"Tags":"browser-cache,appium-android,python-appium,appium-desktop,android-chrome","A_Id":61352803,"CreationDate":"2020-04-21T06:17:00.000","Title":"Is there any way of clearing cache and free up space from android using appium python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working on Django and I know to create a account to log in into admin page I have to create a superuser.And for that we have to pass the command python manage.py createsuperuser.\nBut my question is when we pass this command what happens first and because of what in the background and after that what happens?? Which all methods and classes are called to create a superuser??\nI know its a weird question but I wanted to know how this mechanism works..\nThanks in advance!!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":114,"Q_Id":61337176,"Users Score":0,"Answer":"Other people will answer this in detail but let me tell you in short what happens.\nFirst when you pass the command python manage.py createsuperuser you will be prompted to fill the fields mentioned in USERNAME_FIELD and REQUIERD_FIELDS, when you will fill those fields then django will call your user model manager to access your create_superuser function and then code in that will execute to return a superuser.\nI hope this will help you.","Q_Score":0,"Tags":"python,django","A_Id":61337362,"CreationDate":"2020-04-21T06:23:00.000","Title":"What happens in background when we pass the command python manage.py createsuperuser in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Django server running which utilizes files in a directory \/PROCESSING_DOCS\/*.json. An API call dynamically adds more files to this folder. Now I need to maintain a queue which updates the files added into that folder dynamically.\nHow can I implement this? I don't have any idea.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":67,"Q_Id":61337273,"Users Score":1,"Answer":"Here are a few suggestions right off the top of my head:\nIf you just need to keep a log of what files were added, processing status, etc:\n\nsince you're doing a lot of I\/O you can add another file (ex: named files_queue) and append the filenames one per line. Later you may add additional details (CSV style) about each file (would be a bit of a challenge to search through it if this file grows big).\nrelated to the first idea, if the number of files is not an issue you may create a file (like a .lock file for example) for each file processed and maybe store all processing details in it (and it will be easy to search).  \nif your application is connected to a database, create a table (ex: named files_queue) and insert one row per each file. Late you may add additional columns to the table to store additional details about each file. \n\nIf you're looking for queue manager there are a few solutions just a \"python queue\" google search away. I personally have used RabbitMQ.\nHope this helps,\nCheers!","Q_Score":1,"Tags":"django,python-3.x","A_Id":61337497,"CreationDate":"2020-04-21T06:31:00.000","Title":"How to synchronously add files in a queue?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using the stripe subscription API to provide multi tier accounts for my users. but about 50% of the transactions that i get in stripe are declined and flagged as fraudulent. how can i diagnose this issue knowing that i'm using the default base code provided in the stripe documentation (front end) and using the stripe python module (backend).\nI know that i haven't provided much information, but that is only because there isn't much to provide. the code is known to anyone who has used stripe before, and there isn't any issue with it as there are transaction that work normally.\nThank you !","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":284,"Q_Id":61343164,"Users Score":0,"Answer":"After contacting stripe support, i found that many payments were done by people from an IP address that belongs to a certain location with a card that is registered to a different location.\nfor example if someone uses a French debit card from England. i did ask stripe to look into this issue.","Q_Score":0,"Tags":"python,stripe-payments","A_Id":61781112,"CreationDate":"2020-04-21T12:05:00.000","Title":"Stripe too many high risk payments","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm just setting up a firebase database for my kivy app and the first thing I need to do is \"add an app to get started\", the choices being IOS, Android, Web or Unity. Is this saying that I need to set up and maintain code for an Android-Kivy app and an IOS-Kivy app? The idea behind Kivy is that it is write once, use everywhere so I'm hoping to just have one version.\nOr have I misunderstood this part?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":134,"Q_Id":61350876,"Users Score":1,"Answer":"If you want to target both Android and iOS for any cross-platform development tool (not just Kivy), you will need to add both an Android and iOS app to your Firebase project.  Firebase doesn't know anything about Kivy (or Flutter, or Unity), so you have to tell it which OS is being targeted.","Q_Score":0,"Tags":"python,google-cloud-firestore,firebase-authentication,kivy,kivy-language","A_Id":61351245,"CreationDate":"2020-04-21T18:46:00.000","Title":"Firestore authentication asking to select \"android\/ios\" or \"web\" for kivy app","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am making a uwsgi web app with python and came across a requirement where I have to limit the no. of requests that the server should accept. Here , I came across the uwsgi option  max-requests. But the help says  help: reload workers after the specified amount of managed requests.\nSince I am not an native english speaker , I could not understand what that meant exactly.\nMy current understanding is :\nSuppose I set max-requests to 100 , the 10 workers.\nI get 150 requests , 100 requests are served and the rest are put in some queue . (?)\nAfter the 1st request is done , the 101st request is accepted by the worker. (?)\nPlease clarify\/help.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":1464,"Q_Id":61359392,"Users Score":1,"Answer":"So your Python code is run in workers. There are usually several of them in parallel. The max-requests specifies that, after a certain number of requests per worker, it is reloaded. Basically, your Python code is restarted every max-requests.\nIn you example, if you have 150 requests with 10 workers, nothing will happen (because 150\/10 < 100).\nBut after 1000 requests, workers will be reloaded (which will take some time, but it's probably fine because there are 10 workers so they won't be all reloaded at the same time). There are no queues there.","Q_Score":1,"Tags":"python,nginx,server,uwsgi","A_Id":61359757,"CreationDate":"2020-04-22T07:20:00.000","Title":"How does max-requests in uwsgi actually work","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"The tutorial writes in source env\/bin\/activate\nWhen I write it in this is what comes out:\n\n(venv) C:\\Users\\user\\PycharmProjects\\FirstProject>source env\/bin\/activate\n  'source' is not recognized as an internal or external command,\n  operable program or batch file.\n\nHe uses a mac and I use Windows 10, do I need a different line of code?","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":53,"Q_Id":61363163,"Users Score":0,"Answer":"just run: env\\Scripts\\activate. You do not need to use source on Windows.","Q_Score":0,"Tags":"python,django,python-venv","A_Id":61363536,"CreationDate":"2020-04-22T10:43:00.000","Title":"I'm trying to complete the Django website tutorial, following the youtube tutorial - and at the beginning I have this \"error\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"The tutorial writes in source env\/bin\/activate\nWhen I write it in this is what comes out:\n\n(venv) C:\\Users\\user\\PycharmProjects\\FirstProject>source env\/bin\/activate\n  'source' is not recognized as an internal or external command,\n  operable program or batch file.\n\nHe uses a mac and I use Windows 10, do I need a different line of code?","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":53,"Q_Id":61363163,"Users Score":0,"Answer":"don't use source, instead just type in your_env_name\\Scripts\\activate.bat\nRemember to use backward slashes.","Q_Score":0,"Tags":"python,django,python-venv","A_Id":64153540,"CreationDate":"2020-04-22T10:43:00.000","Title":"I'm trying to complete the Django website tutorial, following the youtube tutorial - and at the beginning I have this \"error\"","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have Sentry integrated in a Django project with the aiohttp integration, the app is running with gunicorn. The problem is that the logs in the Sentry are duplicated, one is being sent by gunicorn and the other by the aiohttp logger, can i disable the gunicorn log to prevent this?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":136,"Q_Id":61370376,"Users Score":1,"Answer":"Solved, before the init of the sdk\nfrom sentry_sdk.integrations.logging import ignore_logger\nignore_logger('gunicorn.error')","Q_Score":1,"Tags":"python,gunicorn,sentry","A_Id":61371779,"CreationDate":"2020-04-22T16:39:00.000","Title":"Is there a way to deactivate gunicorn log from sentry?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Trying to decide on the best route for generating server-side pdf reports within my app currently deployed on Heroku. I've read several posts that say both require installation external libraries- but haven't found anything describing functionality & ease of install on Heroku.\nDoes anyone here have experience installing either to an app on Heroku? Is it a difficult process- is one easier to setup on Heroku than the other? Or if I am able to install on my local system and run PIP Freeze, will that take care of any installs necessary on Heroku?\nThanks!!","AnswerCount":4,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":1412,"Q_Id":61370630,"Users Score":2,"Answer":"WeasyPrint is much easier to use than ReportLab, the only issue with weasyprint is it doesn't handle page breaks correctly (since you're converting an HTML page to PDF) which can be a deal breaker if your reports extend on more than 1 page (for example tables)","Q_Score":3,"Tags":"python,django,heroku,reportlab,weasyprint","A_Id":63359829,"CreationDate":"2020-04-22T16:52:00.000","Title":"Weasyprint or Reportlab for generating Django reports on Heroku","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Trying to decide on the best route for generating server-side pdf reports within my app currently deployed on Heroku. I've read several posts that say both require installation external libraries- but haven't found anything describing functionality & ease of install on Heroku.\nDoes anyone here have experience installing either to an app on Heroku? Is it a difficult process- is one easier to setup on Heroku than the other? Or if I am able to install on my local system and run PIP Freeze, will that take care of any installs necessary on Heroku?\nThanks!!","AnswerCount":4,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":1412,"Q_Id":61370630,"Users Score":1,"Answer":"I have foremost experience of Reportlab. To get it up and running requires quite lot of effort from your side, it does not work \"out of the box\" and involves lot of programming (you need to create templates, build logic around text, build routines around batch jobs etc.). It installs as a normal PIP package, but then you need to start programming to get it working.\nHowever, it looks like Weasyprint uses another technology to generate pdf (CSS for print) which might be a more readily accessible solution if you already have pages formatted with CSS.","Q_Score":3,"Tags":"python,django,heroku,reportlab,weasyprint","A_Id":61377605,"CreationDate":"2020-04-22T16:52:00.000","Title":"Weasyprint or Reportlab for generating Django reports on Heroku","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So when you make changes to your CSS or JS static file and run the server, sometimes what happens is that the browser skips the static file you updated and loads the page using its cache memory, how to avoid this problem?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":185,"Q_Id":61383900,"Users Score":0,"Answer":"Well there are multiple ways to avoid this problem\n\nthe simplest way is by:\n\nif you are using Mac: Command+Option+R\nif you are using Windows: Ctrl+F5\n\n\nWhat it does is that it re-downloads the cache files enabling the update of the static files in the browser.\n\nAnother way is by:\n\nmaking a new static file and pasting the existing code of the previously used static file and then \nrunning the server\n\n\nWhat happens, in this case, is that the browser doesn't use the cache memory for rendering the page as it assumes it is a different file.","Q_Score":0,"Tags":"javascript,python,css,django,static-files","A_Id":61383901,"CreationDate":"2020-04-23T09:33:00.000","Title":"How to fix not updating problem with static files in Django port 8000","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So when you make changes to your CSS or JS static file and run the server, sometimes what happens is that the browser skips the static file you updated and loads the page using its cache memory, how to avoid this problem?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":185,"Q_Id":61383900,"Users Score":0,"Answer":"U have DEBUG = False in your settings.py. Switch on DEBUG = True and have fun","Q_Score":0,"Tags":"javascript,python,css,django,static-files","A_Id":69756851,"CreationDate":"2020-04-23T09:33:00.000","Title":"How to fix not updating problem with static files in Django port 8000","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"i ask if Django make database indexes for ManyToMany Field ... and if yes is it do this for the model i provide in through ? \ni just want to make sure that database will go fast when it have a lot of data","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":540,"Q_Id":61384298,"Users Score":0,"Answer":"It does for plain m2m fields - can't tell for sure for \"through\" tables since I don't have any in my current project and don't have access to other projects ATM, but it still should be the case since this index is necessary for the UNIQUE constraint. \nFWIW you can easily check it by yourself by looking at the tables definitions in your database (in MySQL \/ mariadb using the show create table yourtablename).\nThis being said, db index are only useful when there are mainly distinct values, and can actually degrade performances (depending on your db vendor etc) if that's not the case - for example, if you have a field with like 3 or 4 possible values (ie \"gender\" or something similar), indexing it might not yield the expected results. Should not be an issue for m2m tables since the (table1_id, table2_id) pair is supposed to be unique, but the point is that you should not believe that just adding indexes will automagically boost your performances - tuning SQL database performances is a trade in and by itself, and actually depends a lot of how you actually use your data.","Q_Score":1,"Tags":"python,django,python-3.x,database,django-models","A_Id":61388221,"CreationDate":"2020-04-23T09:55:00.000","Title":"Is Django Make Indexes for ManyToMany field?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to scrape data within the iFrame.\nI have tried webdriver in Chrome as well as PhantomJS with no success. There are source links contained within the iframe where I assume its data is being pulled from, however, when using these links an error is generated saying \"You can't render widget content without a correct InstanceId parameter.\" \nIs it possible to access this data using python (PhantomJS)?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":27,"Q_Id":61387511,"Users Score":0,"Answer":"Go to network tools in your browser and investigate what data go to the server and just scrape via simple requests.","Q_Score":0,"Tags":"python,iframe,selenium-chromedriver,phantomjs,forex","A_Id":61387643,"CreationDate":"2020-04-23T12:42:00.000","Title":"Python Scrape Financial Data From iFrame","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a simple flask app that talks to Google Cloud Storage.\nWhen I run it normally with python -m api.py it inherits Google Cloud access from my cli tools.\nHowever, when I run it with the PyCharm debugger it can no longer access any Google Services.\nI've been trying to find a way to have the PyCharm debugger inherit the permissions of my usual shell but I'm not seeing any way to do that.\nAny tips on how I can use the PyCharm debugger with apps that require access to Google Cloud?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":270,"Q_Id":61392695,"Users Score":1,"Answer":"I usually download the credentials file and set GOOGLE_APPLICATION_CREDENTIALS=\"\/home\/user\/Downloads\/[FILE_NAME].json environment variable in PyCharm. \nI usually create a directory called auth and place the credential file there and add that directory to .gitignore\nI don't know if it is a best practice or not but it gives me an opportunity to limit what my program can do. So if I write something that may have disrupting effect, I don't have to worry about it. Works great for me. I later use the same service account and attach it to the Cloud Function and it works out just fine for me.","Q_Score":0,"Tags":"python,google-cloud-platform,pycharm","A_Id":61395962,"CreationDate":"2020-04-23T16:53:00.000","Title":"How can I use the PyCharm debugger with Google Cloud permissions?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"When I try to makemigrations of my models on my new project with Django, I receive an error message,>No installed app with label 'app_name', what could be the issue and how can I fix it.?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":91,"Q_Id":61408654,"Users Score":0,"Answer":"Go to Django settings.py and put your app: \"app_name\" into INSTALLED_APPS.\nIf it doesn't work still, then check your syntax in models.py.","Q_Score":0,"Tags":"python-3.x,django-3.0","A_Id":65653480,"CreationDate":"2020-04-24T12:44:00.000","Title":"No installed app with label 'app_name' error message","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an idea to make something similar to Workflowy but with some new features. \n(Workflowy is basically a note-taking app which beautifully organises all your notes as an endless tree)\nAt first, I implemented the logic in Python. It works in a terminal by printing notes line-by-line and then waiting for the command. \nIs this a good idea to keep all the logic at the server and use JS only to render items and to send commands to the server? \nFor instance, if I want to move the entire folder into another folder, there are two ways of doing this:\n\nWay 1: With Python which receives a command from JS 'move folder x to folder y', processes it and sends back a result to render.\nWay 2: With JS which then has to understand all the folder structure and logic. In this case, the app will use a server only for storing data. \n\nI have a feeling that way 2 (using JS to understand all the logic and Python only for saving data) is more appropriate, but this means that I have to rewrite everything from scratch. \nIs the way 1 also reasonable? \nMany thanks in advance!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":264,"Q_Id":61425765,"Users Score":1,"Answer":"It depends on the application you are making.\nLike if you want to display thousands of data in html file, and data are stored in a json file. If you send html file and json file to the client from the server, then on the client side, you run a script that reads json file and displays it in html, then it will be slower, because client device may not be that powerful as the server is.\nSo for performance, use heavy tasks on server side, this may cause little more internet usage because as the client has no data in formatted manner, whenever new task on data is to be performed, you have to request the server again.\nBut for opposite case, you can save internet and little low performance. Here you can do some heavy tasks on client side.\nIt also depends on which device is used at client side.","Q_Score":1,"Tags":"javascript,python,vue.js,frontend,backend","A_Id":61425859,"CreationDate":"2020-04-25T12:38:00.000","Title":"How do I divide tasks between frontend and backend properly?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I changed the database from SQLite3 to PostgreSQL in my Django project. Is it possible to store my new database in the GitHub repository so that after cloning and running by the command\npython manage.py runserver\nthe project has started with the whole database?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":586,"Q_Id":61426399,"Users Score":1,"Answer":"You cannot save the database as such, you can instead create fixtures to be run. Whenever someone will clone the project, he\/she can simple run those fixtures to populate the database.","Q_Score":1,"Tags":"python,django,git,postgresql,github","A_Id":61426459,"CreationDate":"2020-04-25T13:29:00.000","Title":"Storing the Django project with the PostgreSQL database on GitHub","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In Django when I set my date\/time to default \n default=datetime.now()\nIt automatically migrated in models.py. Why I do not need to do migration for it?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":25,"Q_Id":61427665,"Users Score":2,"Answer":"just change default=datetime.now() to default=datetime.now\nNow I really think, you meant why there is always a new migrations for this model ?\nIt is beacuse you are changing the model structure by doing \n\ndefault=datetime.now() this, actually calls the function whenever\n  this line is read,\n\nwhereas what you want to do is : \n\ndefault=datetime.now this will be called when a new instance is\n  created.","Q_Score":0,"Tags":"python,django,sqlite","A_Id":61427962,"CreationDate":"2020-04-25T15:00:00.000","Title":"why does date time function don't need migration when I set it to default?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to create web form that stays on forever on a single computer. Users can come to the computer fill out the form and submit it. After submitting, it will record the responses in an excel file and send emails. The next user can then come and fill out a new form automatically. I was planning on using Flask for this task since it is simple to create, but since I am not doing this on some production server, I will just have it running locally in development on the single computer.\nI have never seen anyone do something like this with Flask so I was wondering if my idea is possible or if I should avoid it. I am also new to web development so I was wondering what problems there could be with keeping a flask application stay on 24\/7 on a local development computer.\nThanks","AnswerCount":3,"Available Count":2,"Score":0.1325487884,"is_accepted":false,"ViewCount":1043,"Q_Id":61431307,"Users Score":2,"Answer":"Your idea is possible and while there are many ways to do this kind of thing, what you are suggesting is not necessarily to be avoided. \nAll apps that run on a computer over a long period of time start a process and keep it going until closed. That is essentially what you are doing. \nHaving done this myself (and still currently doing it) at my business, I can say that it works great. \nThe only caveat is that to ensure that it will always be available, you need to have the process monitored by some tool to make sure that it gets restarted if it ever closes due to a variety of reasons. \nIn linux, supervisor is a great tool for doing that. In windows you could register it as a service. But you could also just create an easy way to restart and make it easy for the user to do so if it is down when they need it.","Q_Score":2,"Tags":"python,flask,web-development-server","A_Id":61431632,"CreationDate":"2020-04-25T19:23:00.000","Title":"Advice on running flask app ONLY locally forever","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to create web form that stays on forever on a single computer. Users can come to the computer fill out the form and submit it. After submitting, it will record the responses in an excel file and send emails. The next user can then come and fill out a new form automatically. I was planning on using Flask for this task since it is simple to create, but since I am not doing this on some production server, I will just have it running locally in development on the single computer.\nI have never seen anyone do something like this with Flask so I was wondering if my idea is possible or if I should avoid it. I am also new to web development so I was wondering what problems there could be with keeping a flask application stay on 24\/7 on a local development computer.\nThanks","AnswerCount":3,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":1043,"Q_Id":61431307,"Users Score":2,"Answer":"There is nothing wrong with doing this in principle however, it is likely not the best solution for the time-to-reward payoff.\nFirst, to answer your question, this could easily be done, even for a beginner, completing this in a few hours with minimal Python and HTML experience could definitely be done. Your app could crash in the background for many reasons (running out of space, bad memory addresses, etc) but most likely you will be fine.\nAs for specifically building it, it is all possible, there are libraries you can use to add the results to an excel file, or you can easily just append to a CSV (which is what I would recommend). Creating and sending an email, similarly is relatively simple, but again, doing it without python would be much easier.\nIf you are not set on flask\/python, you could check out Google Forms but if you are set on python, or want to use it as a learning experience, it can definitely be done.","Q_Score":2,"Tags":"python,flask,web-development-server","A_Id":61431729,"CreationDate":"2020-04-25T19:23:00.000","Title":"Advice on running flask app ONLY locally forever","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to upload a js file in the root directory of my flask application such that I can access it on the url localhost:5000\/file.js\nI tried to put the js file on the same directory as app.py, but that didn't work.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":158,"Q_Id":61435905,"Users Score":0,"Answer":"It won't work like that, your app.py is running the server, so though it can access the js file, it would have to be on a route to shown. I would suggest you bring the js code to .html file in the  tags and then return render_template on this @app.route('\/') .  This should display the html page whenever you visit 127.0.0.1:5000\/ and run the JavaScript consequently.","Q_Score":2,"Tags":"python,flask,web-applications","A_Id":61436080,"CreationDate":"2020-04-26T04:43:00.000","Title":"How to add a file in root directory of a flask app such that it can be accessed on localhost:5000\/file?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So I successfully deployed my dash app with Heroku.\nMy app has many tabs and saves the state for each tab. Meaning if the user changed the table in one tab and then switch to another tab and comeback to the tab then the table has the same content as before. \nThe problem is that I don't want the state to be saved if the user exit the site and then entered again. \nSo far during the development I achieved this by running the python command for running the app again, but now I can't do this (I launched the app with Docker container and it's seems that one image is shared between all the sessions).\nIs there a way in Heroku to solve this problem? maybe create a new image for each new sessions?\nThanks in advance.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":153,"Q_Id":61445664,"Users Score":0,"Answer":"you create an image to release your application (say v1.0) and run it on Docker env (Heroku or other platforms). The application runs in a container and serves all users: every restart or redeploying a new image would need a downtime which impacts everyone.\nThe solution (for what I can understand) is that you want to clear the session data for a given user, so the saved state wont be used at the next access.\nI think you should look at doing that in your app: for example when accessing the home url (ie entrypoint of your app) clear any setting related to the user (which you would typically recognised with a cookie).\nNot if it help, if not share more details on how you save the user state.","Q_Score":1,"Tags":"python,docker,heroku,plotly-dash","A_Id":61446982,"CreationDate":"2020-04-26T18:10:00.000","Title":"How to deploy dash app with states using Heroku?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to create a web app with Django and integration of Selenium and Python-Docker API.\nWhere inside the Django project is the correct place to put the Selenium scripts so users will be able the run it by a puse of a button?\nI've seen some thred saying inside a 'view', but is is a lot of logic that I've sprated into multipale .py files.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":226,"Q_Id":61457373,"Users Score":1,"Answer":"You must import Selenium package inside another file such as sel-functions.py inside your app. \nThen you define your class or functions inside this file. Finally you can import all those functionality to your views.py file. \nThis is best and cleanest way to work with another package or functionality in Django project. \nAlso if multiple apps of your project need to sel-functions.py  you can put that in your project directory beside settings.py. \n\nAlso, if your code has grown so much that it has multiple files, you\n  need to define a package for your intended work and define it as an\n  application in your project.","Q_Score":1,"Tags":"python,django,selenium","A_Id":61458639,"CreationDate":"2020-04-27T11:00:00.000","Title":"Django and pure Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I would like to transfer an app from server 1 to server 2 (size of the app 700Mb)\nfirst test : try to pack to build a w2p package --> internal error  (it works for app 400 Mb)\nSecond test : i create a tar from server 1 and i transfer to server 2 --> the app tells me no function (note that she works very well on server 1)\nServer 1 : debian jessie\nServer 2 : debian buster\nAny idea ?\nthank you very much","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":50,"Q_Id":61462836,"Users Score":0,"Answer":"what i would suggest is compile the app and then transfer however you would like to another server. that will solve 700mb issue and keeps integrity of app files.","Q_Score":0,"Tags":"python,web2py","A_Id":61647174,"CreationDate":"2020-04-27T15:50:00.000","Title":"Transfer a big app web2py to a new server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm building a personal website that I need to apply modularity to it for purpose of learning. What it means is that there is a model that contains x number of classes with variations, as an example a button is a module that you can modify as much depending on provided attributes. I also have a pages model that need to select any of created modules and render it. I can't find any documentation of how to access multiple classes from one field to reference to. \nModel structure is as below:\n\nModules, contains module A and module B\nPages should be able to select any of module A and order its structure.\n\nPlease let me know if not clear, this is the simplest form I could describe. Am I confusing this with meta classes? How one to achieve what I'm trying to achieve?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":18,"Q_Id":61464967,"Users Score":0,"Answer":"I ended up using Proxy models but will also try polymorphic approach. This is exactly what is designed to do, inherit models from a parent model in both one to many and many to many relationships.","Q_Score":0,"Tags":"python,django,django-models","A_Id":61470153,"CreationDate":"2020-04-27T17:40:00.000","Title":"Modular python admin pages","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to git and Pythonanywhere. So, I have a live Django website which is hosted with the help of Pythonanywhere. I have made some improvements to it. I have committed and pushed that changes to my Github repository. But, now I don't know that how to further push that changes to my Pythonanywhere website. I am so confused. Please help!!! Forgive me, I am new to it.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":145,"Q_Id":61465874,"Users Score":1,"Answer":"You need to go to the repo on PythonAnywhere in a bash console, run git pull (You may need to run .\/mange.py migrate if you made changes to your models) and then reload the app on \"Web\" configuration page on PythonAnywhere. .","Q_Score":0,"Tags":"python,django,web-deployment","A_Id":61477904,"CreationDate":"2020-04-27T18:30:00.000","Title":"How to deploy changes made to my django project, which is hosted on pythonanywhere?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"i am just starting a new project on my pycharm i start a new project and run my server but am getting this error message couldn't import django, Must i install django for every project am creating?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":310,"Q_Id":61481481,"Users Score":0,"Answer":"If you are using virtual environment for every new project then you need to install django each time. Other wise you can use single virtual environment for all the project. It depends on you how you prefer. But I highly recommend you to use separate virtual environment for new project.","Q_Score":0,"Tags":"python,django","A_Id":61481656,"CreationDate":"2020-04-28T13:33:00.000","Title":"Must i install django every time am starting a project in pycharm","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"There is a problem, there is a Book model and in it title is the name of the book, and author is the ForeignKey of the Author model where there is a name field.\nI need to get a Python list and for this I do\nbooks = list(Book.objects.values('title', 'author'),\nbut the result is a list [{'title': 'Harry Potter', 'author': 1}]. How do I make sure that the author is instead of the unit?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":46,"Q_Id":61481996,"Users Score":1,"Answer":"The quickest fix for you is books = list(Book.objects.values('title', 'author__name'). In the assumption that author model has name field.","Q_Score":1,"Tags":"python,django,django-models","A_Id":61482095,"CreationDate":"2020-04-28T13:56:00.000","Title":"Django Model Foreign Key to text","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working with selenium for the first time, and I'm trying to play a video on another website.\nI've already managed to play the video, but now I'm stuck trying to make it full-screen. The full-screen button is hidden unless I hover with my mouse over it.\nSo I searched for a solution and everybody suggests to use switch_to.frame() and then access the button, but it seems like no frame surrounds the video in my case. I'm not an expert in HTML so maybe I am getting this wrong, but is there a way to click that full-screen button when there's no frame surrounding the video?\nThanks in advance for any help :)","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":628,"Q_Id":61485665,"Users Score":1,"Answer":"If there isn't an iframe containing the video, you should be able to click the button like you would any other on the screen. To get the hover menu to appear you can use ActionChains(driver).move_to_element(element).perform(). \nIf you're having issues finding the button, you may also be able to video_player.send_keys(\"f\"). Many players will use that shortcut to switch to fullscreen.","Q_Score":0,"Tags":"javascript,python,html,selenium,selenium-webdriver","A_Id":61486320,"CreationDate":"2020-04-28T16:56:00.000","Title":"Python Selenium - how to click full screen button of a video without a frame","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to create a progress bar in React by calling a Flask microservice with Python.\nI don't have problems to display the component in the frontend but I don't know if:\n\nIs possible to get a response with the progress of a script done in a\nFlask microservice?\nCan a socket communication be established between Javascript and Python?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":325,"Q_Id":61489667,"Users Score":0,"Answer":"You have broadly speaking three choices:  \n\nWebsockets with flask-websockets\nhttps:\/\/flask-socketio.readthedocs.io\/en\/latest\/ \nServerSentEvents\nhttps:\/\/en.wikipedia.org\/wiki\/Server-sent_events \nHaving the process update an in-memory cache that you can poll through another ingress route.\n\nThe first and second are difficult if you run Flask properly with WSGI.","Q_Score":0,"Tags":"javascript,python,reactjs,sockets,flask","A_Id":61491873,"CreationDate":"2020-04-28T20:45:00.000","Title":"Creating a React JS progress bar based on progress of Flask microservice?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Say I have a django app called App1 and a django app called App2.\nApp1 has an endpoint called getJson() which returns a json object.\nNow, in App2, I have an endpoint which renders an html template. In the html template I have a button and when the button is clicked, I want to call App1's getJson function. Is there a better way to do this than doing a get request in the JS of the template? If so, how?\nThanks!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":31,"Q_Id":61492512,"Users Score":0,"Answer":"Short answer, no. That's the basic flow of a Django App, you get requests and you respond.\nThe Django apps are running on a server machine. When you say App2 renders an html template, what it is doing is sending an HttpResponse with the given template, rendered, as payload to whoever requested it. This will be received in another machine, by another process.\nSo, if that other process (in another machine or the same) renders the text as an html, loads a website and shows a button, its not at all linked to your Django App. App2 ends its job when it renders and sends an HttpResponse. So if you want to control what ever happens when you press that button, you will need to communicate back with your server. And we do that sending http requests.","Q_Score":0,"Tags":"python,django","A_Id":61493186,"CreationDate":"2020-04-29T01:02:00.000","Title":"Calling Django JSON API from Template","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In Django I need to run a shell command at some point. The command takes 6-10 minutes so I like to get live stdout from the command in my Django View in order to live track the command.\nI now how to run the command and get live output with subprocess but I have no clue of how to pass the live output to the views.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":87,"Q_Id":61511376,"Users Score":1,"Answer":"I would suggest running the sub process into cron and storing the output to a file\/db where you can get the progress from the view. Another option is to go for threading using celery. \nThe problem is that the view is not persistent, so you can not keep the hook to the output pipe across http requests.","Q_Score":2,"Tags":"python,django,subprocess","A_Id":61511557,"CreationDate":"2020-04-29T20:47:00.000","Title":"Get live output of subprocess command","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"When logging out a user with Flask-Login, is there a way to log out all sessions that user may have (Ex: in different browsers, different devices, etc)?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":1332,"Q_Id":61514401,"Users Score":1,"Answer":"As Artiom said in his answer, Flask-Login by default uses Flask session which is client side, and you won't be able to delete all those cookies from other clients.\nHowever, there is a way to prevent other clients from logging in. Flask-Login relies on user_loader callback function to fetch the user from your cache, this function gets called on every HTTP request coming from the user's client. \nWhat you can do is on logout, you delete this particular user from this cache. That way when any client (phone, other browser,etc..) used by this user try to access your page. Flask-Login won't find the user in the cache and will redirect them to the login page.","Q_Score":0,"Tags":"python,session,flask,session-cookies,flask-login","A_Id":61529812,"CreationDate":"2020-04-30T01:25:00.000","Title":"Flask Logout All Sessions of a Specific User","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My understanding is that on a normal React website all the media will be served from the same server than the front-end files (HTML, CSS and Javascript).\nThe REST API backend will only provide links to where those images are stored, and it will be served and displayed by the front end.\nThe problem is if those images are private and only one user should be able to see them. If someone gets a hold of the image URL and opens it they would be able to see the image.\nHow do modern websites get around this problem? What would be the workflow between Django and React to keep the user's images safe and private?","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1382,"Q_Id":61516203,"Users Score":0,"Answer":"Actually, before the REST API endpoint serves the URL of images, the request and response of the endpoint can be properly authorized using the Django REST frameworks authorization framework. \nAdditionally, you can write your own custom Django middlewares [HTTP hooks] for your desired end goal.\nThe middlewares can custom the HTTP request-response behaviors based on your needs.","Q_Score":2,"Tags":"javascript,python,django,reactjs,django-rest-framework","A_Id":61613804,"CreationDate":"2020-04-30T04:57:00.000","Title":"Django Rest Framework and React Front End: How to prevent unauthorized users from viewing private images if they get a hold of the image URL?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using Blueprints to create two separate modules, one for api and one for website. My APIs have a route prefix of api. Now, I am having a route in my website called easy and it will be fetching a JSON from a route in api called easy and it's route is \/api\/easy.\nSo, how can i call \/api\/easy from \/easy.\nI have tried using requests to call http:localhost:5000\/api\/easy and it works fine in development server but when I am deploying it on Nginx server, it fails probably because I am exposing port 80 there.\nWhen I deploy my webapp on nginx, it show up perfectly just that route \/easy throws Internal Server Error.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":65,"Q_Id":61520470,"Users Score":0,"Answer":"Okay so what worked for me is I simply ended up calling the api function from the frontend rather than doing the POST requests. Obviously, it makes no sense creating backend routes for flask seperately when you are using Flask too in frontend. Simply, a seperate utility function would be fine.","Q_Score":0,"Tags":"python-3.x,nginx,flask,wsgi","A_Id":62313062,"CreationDate":"2020-04-30T09:44:00.000","Title":"How to access Flask API from Flask Frontend?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm new to APIs creation in django.\nI checked DRF serializers and I found them useful when manipulating models in DB. My APIs don't use models they are based on forms. \nSo my question is : what can I get more from using DRF validators then using django forms validators in my views ? maybe the content type is more convenient  (application\/x-www-form-urlencoded vs application\/json) ?","AnswerCount":1,"Available Count":1,"Score":0.537049567,"is_accepted":false,"ViewCount":771,"Q_Id":61522954,"Users Score":3,"Answer":"DRF's serializers are nicely integrated within the framework. Whether they are models based or not, you will have a nice browsable UI to play with for free and you can get OpenAPI schema generation. There are probably other things I did not think of.\nWhat serializers can do that forms can't:\n\nNested data - although you can get some results with formsets.\nHyperlinked relational fields\nDifference between an empty field and a blank field - HTML forms can't do that\nout of the box integration with generic class based views or viewsets\n\nPlease note that your can still benefit from DRF even if you are not using serializers. DRF parts are loosely coupled.","Q_Score":2,"Tags":"python,django,django-rest-framework,django-forms","A_Id":61523213,"CreationDate":"2020-04-30T12:03:00.000","Title":"Django form validation vs DRF serializer validation","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it possible to create an automated process where a script (could be Python) could grab a Data Studio template, replicate it and then connect to a different data source?\nMy concern about using 1 dashboard for all 300 clients is the load time to filter and update the dashboard, plus restricting access to the client to only see their data.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":468,"Q_Id":61527041,"Users Score":0,"Answer":"This is currently not supported.\nThere is no API to programmatically copy reports or reconnect data sources.","Q_Score":1,"Tags":"python,automation,google-data-studio","A_Id":61552273,"CreationDate":"2020-04-30T15:26:00.000","Title":"Automated process Data Studio","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"This may be an opinionated question but sorry I am too curious.\nI learned to develop Django Model-View-Template websites ( multi page websites) and Django Rest Framework.\nFrom the same Django Model can I create Rest API's and MVC templates together ?\nI wanted to develop a Blog website that use session authentication and  based on MVC architecture. The same server should create API's because the Mobile app for the Blog may consume the API's and use Token Authentication (using Djoser). \nIf I use same User model for session and token authentication, Can mobile blog app users use their username and password to access website version ?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":103,"Q_Id":61540356,"Users Score":2,"Answer":"Django REST Framework is just a collection of helpers to easily create HTTP endpoints that conform to REST behaviour, which mostly means conventions around GET, POST, PUT and DELETE. You could code all this behaviour by hand using default Django, DRF just makes it a lot easier. The end result are simply specific routes which accept input and return output in specific formats to\/from models.\nOf course you can use that in addition to normal Django Views. It's just a different interface to your models and other business logic. Authentication can be the same, but typically you use some sort of token authentication for the API; that ultimately depends on how the API is supposed to be used exactly.","Q_Score":1,"Tags":"python,django,django-rest-framework","A_Id":61540601,"CreationDate":"2020-05-01T10:02:00.000","Title":"Serving Django MVC and Django Rest Framework from same Model","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've just upgraded to Ubuntu 20.04. I was working with a python 3.7 project using Django inside a virtual environment, so I was confident even with the upgraded distro (which involved the installation of python 3.8) my venv would still worked. Unfortunately, that's not the case: when I activate my venv, the interpreter of python is still the 3.8 version, and nothing works. python 3.7 is completely missing. What can I do to restore my project?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":4777,"Q_Id":61541281,"Users Score":1,"Answer":"In my case, it was solved just by deleting and recreating the virtual env, and reinstalling Django, of course. After that, just reloaded Apache and everything worked again.","Q_Score":11,"Tags":"python-3.x,operating-system,upgrade,python-venv,linux-distro","A_Id":64431823,"CreationDate":"2020-05-01T11:07:00.000","Title":"python 3.7 venv broken after upgrade to Ubuntu 20.04","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"When I start jupyter notebook, it loads on internet explorer, but I want to open jupyter notebook on my desirable browser, please provide a general solution for all browsers. I am using windows 7.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":178,"Q_Id":61552018,"Users Score":0,"Answer":"You can also copy the link from your Jupyter terminal and then paste it to your desirable browse.","Q_Score":0,"Tags":"python,browser,jupyter-notebook,jupyter","A_Id":61552165,"CreationDate":"2020-05-01T22:50:00.000","Title":"how to open jupyter notebook on desirable browser","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"When I start jupyter notebook, it loads on internet explorer, but I want to open jupyter notebook on my desirable browser, please provide a general solution for all browsers. I am using windows 7.","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":178,"Q_Id":61552018,"Users Score":0,"Answer":"go to \n\nC:\\Users\\username\\AppData\\Roaming\\jupyter\\runtime\n\nand then rightclick on any .html file and then go to change and then select any browser you want to an click on apply. Then run Jupyter notebook.","Q_Score":0,"Tags":"python,browser,jupyter-notebook,jupyter","A_Id":61552036,"CreationDate":"2020-05-01T22:50:00.000","Title":"how to open jupyter notebook on desirable browser","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have around 10 websites I need to scrape some data off from. I'm using Scrapy, and I need to know if I have to make 10 separate projects (one for each website) or 10 spiders in a single project?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":44,"Q_Id":61556851,"Users Score":0,"Answer":"In theory both is possible, you can have multiple spiders in one project or set up multiple projects. However with 10 websites chances are quite high that you need distinct pipelines, middleware-settings and so on. For that reason I would generally suggest using multiple projects. Also your items.py might grow very large with multiple spiders and so you might loose track.","Q_Score":2,"Tags":"python-3.x,scrapy","A_Id":61563582,"CreationDate":"2020-05-02T09:02:00.000","Title":"Is there a way to have more than 2 spiders crawling different websites in one project using Scrapy?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have around 10 websites I need to scrape some data off from. I'm using Scrapy, and I need to know if I have to make 10 separate projects (one for each website) or 10 spiders in a single project?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":44,"Q_Id":61556851,"Users Score":0,"Answer":"If you can share any code between spiders (item base class, middleware, etc.), I would go for a single project.\nIf you have spider-specific items, pipelines or middleware, you can always define those on the spider Python files themselves.","Q_Score":2,"Tags":"python-3.x,scrapy","A_Id":61632248,"CreationDate":"2020-05-02T09:02:00.000","Title":"Is there a way to have more than 2 spiders crawling different websites in one project using Scrapy?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My requirement is to call tutorial popup in Odoo10 website moudule to be appear on dashboard module once user login","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":97,"Q_Id":61557180,"Users Score":0,"Answer":"Please check with auth_signup module of odoo it will redirect after login.\nCheck the template and modified it.","Q_Score":0,"Tags":"javascript,python,odoo,odoo-10","A_Id":62232007,"CreationDate":"2020-05-02T09:32:00.000","Title":"How to show Odoo tutorial pop up when user loggins","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm currently using elastic beanstalk and apscheduler to run Pandas reports everyday automatically on it. The data set is getting larger and i've already increased the memory size 3x. \nElastic Beanstalk is running Dash - dashboard application and runs the automated Pandas reports once every night. \nI've tried setting up AWS Lambda to run Pandas reports on there but I couldn't figure out how to use it. \nI'm looking for the most cost-effective way to run my reports without having to increase memory usage on Beanstalk. When I run it locally it takes 1gb but running it on beanstalk, it's using more than 16gb. \nCurious if someone else has a better option or process how they automatically run their Pandas reports.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":43,"Q_Id":61566053,"Users Score":0,"Answer":"Create an .exe using Pyinstaller\nSchedule .exe on Task Scheduler on computer\nCheaper than scaling AWS Beanstalk resources which use more resources calculating pandas than your computer locally at least for my case.","Q_Score":0,"Tags":"python,pandas,amazon-web-services,amazon-elastic-beanstalk","A_Id":63367773,"CreationDate":"2020-05-02T20:44:00.000","Title":"What options are there to setup automatic reporting processes for Pandas on AWS?","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Is django 3 backward compatible with django 2? Are there any syntax changes in django 3 compared to django 2? Will i be able to follow django 2 tutorial on YouTube and be okay to apply it in django 3 as there are not many django 3 tutorials available?","AnswerCount":2,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":17561,"Q_Id":61572949,"Users Score":6,"Answer":"Django 3 is just an evolutionary step from Django 2.\nIt is not like Python 3 and Python 2.\nSome amount of work may be required to port from Django 2 to 3 but much less than needed to port from Python 2 to 3.","Q_Score":11,"Tags":"django,python-3.x","A_Id":61573270,"CreationDate":"2020-05-03T10:28:00.000","Title":"Django 3 vs Django 2","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Okay so I've been trying to show time in my website, and i was successful in it, but then after the time changes in real-time it does change in the site, we will have to reload the page and then time would b updated. Is there a way to update the time without reloading the page using django templates (html).","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":68,"Q_Id":61577101,"Users Score":1,"Answer":"You can use ajax.  Because ajax can reload specific portion of template without reload whole page.","Q_Score":0,"Tags":"python,html,django","A_Id":61577175,"CreationDate":"2020-05-03T15:35:00.000","Title":"Is there a way to dynamically edit value in django template?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am confused about how to realize the data validation in event sourced micro-service architecture.  \nLet sum up some aspects that related to the micro-services.\n1. Micro-services must be low coupled.\n2. Micro-services better to be domain oriented  \nThen due to tons of materials in the internet and the books in DDD (Domain Driven Design)\nI create the next event sourced micro-service architecture.\nComponents\n1. API getaway to receive the REST calls from the clients and transform them into the commands.\n2 Command handler as a service. Receive the commands from API getaway make the validations. Save the events to the event store and publish events to the event bus.\n3. Event store is the storage for all events in the system. Allows us to recreate the state of the app. The main state of truth.\n4. Micro-services is small services responsible to handle the related to its domain event. Make some projections to the local private databases. Make some events too.\nAnd I have questions that I could not answer both by myself and the internet.\n1. What is actually aggregates. They are the class objects\/records in databases as I think or what?\n2. Who carry about aggregates. I found example that is some cases command handler use them. But in that way if aggregates stored in the private micro-services databases then we will have very high coupling between the command handler and the each of micro-services and it is wrong due to micro-service concept.  \nTo sum up.\nI am confused about how to implement aggregation in event source micro service architecture.\nFor example let focus on the user registration implementation in event source micro-service architecture.  \nWe have the user domain so the architecture will be next.\nAPI getaway\nCommand handler\nAuth micro-service\nUser micro-service \nPlease explain me the realization of command validation due to example above.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":317,"Q_Id":61583047,"Users Score":1,"Answer":"Command handler as a service\n\nI think this is the main source of your confusion.\nThe command handler isn't normally a service in itself.  It is a pattern.  It will normally be running in the same process as the \"microservice\" itself.\nIE: the command handler reads a message from so storage, and itself invokes the microservice logic that computes how to integrate the information in this message into its own view of the world.\n\nWhat is actually aggregates\n\n\"Aggregate\" is a lifecycle management pattern; an aggregate is a graph of one or more domain entities that together will establish and maintain some interesting invariant.  It's one of three patterns described in detail in the Domain Driven Design book written by Eric Evans.\nThe command handler plus your aggregate is, in a sense, your microservice.  The microservice will typically handle messages for several instances of a single aggregate - it will subscribe to all of the input messages for that kind of aggregate.  The \"handler\" part just reads the next message, loads the appropriate instance of the aggregate, then executes the domain logic (defined within the aggregate entities) and stores the results.","Q_Score":2,"Tags":"python,architecture,domain-driven-design,microservices,event-sourcing","A_Id":61585106,"CreationDate":"2020-05-03T23:39:00.000","Title":"Command payload validation in event sourced micro-service architecture","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am on 4th chapter the book Django 3 by example and I noticed one thing that we are only creating views from Django's authentication framework but we are not telling those views which template to render when.\nFor example, how does my application would know that it needs to only render the logged_out.html template when we try to access the logout view? If I try to change the name of the file from logged_out.html to loggedout.html then it takes me to the Django's admin logout page.\nWhy?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":52,"Q_Id":61591257,"Users Score":0,"Answer":"In django views, for each view we write at the end\nreturn render(request, 'your template location')\nThat is how django knows which template to render for which view.","Q_Score":1,"Tags":"django,python-3.x,django-views","A_Id":61591785,"CreationDate":"2020-05-04T11:32:00.000","Title":"How does Django knows which template to render when?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am a newbie and currently developing a Django website, I want to know whether I should implement REST framework now for each app or should I do it after completing the whole website? Which is the easiest or the most proffered way and is it easy to implement?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":42,"Q_Id":61599060,"Users Score":0,"Answer":"This may get closed for being an opinion-oriented question, but I will try to answer regardless.\nYour best bet would be to fully develop and test the website first, and then implement the Rest Framework. Your database design, models and functionality will likely change drastically from what you expected, so it would cause many alterations if you were to develop the REST API alongside the initial development.","Q_Score":0,"Tags":"python,django,rest,api,django-rest-framework","A_Id":61599191,"CreationDate":"2020-05-04T18:25:00.000","Title":"Django REST Framework: Is it possible to implement after the complete development of a website?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am a newbie and currently developing a Django website, I want to know whether I should implement REST framework now for each app or should I do it after completing the whole website? Which is the easiest or the most proffered way and is it easy to implement?","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":42,"Q_Id":61599060,"Users Score":1,"Answer":"This is going to depend on the project and the methodology you use. If you are going to need pages that hit the API, you will have to create at least some methods before finishing the website, but if you just want to provide an API to third-party applications or whatever, it is up to you when you want to do this.\nSometimes I think it would be better to complete an APP including the serializers and API views before starting another one, as you will have every fresher and it could take time more time to do it when you have finished the whole website, as you might not remember some of your implementations.","Q_Score":0,"Tags":"python,django,rest,api,django-rest-framework","A_Id":61599346,"CreationDate":"2020-05-04T18:25:00.000","Title":"Django REST Framework: Is it possible to implement after the complete development of a website?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have developed a NLTK based flask app. Now I have deployed it in Heorku. While deploying it I am getting an error: remote: \/app\/.heroku\/python\/lib\/python3.6\/runpy.py:125: RuntimeWarning: 'nltk.downloader' found in sys.modules after import of package 'nltk', but prior to execution of 'nltk.downloader'; this may result in unpredictable behaviour. And also some pages and functions are not working properly. Please suggest me something to solve this problem.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":815,"Q_Id":61599380,"Users Score":0,"Answer":"You need to follow the below steps.\n\nnltk.txt needs to present at the root folder\nAdd the modules you want to download like punkt, stopwords as separate row items\nChange the line ending from windows to UNIX.\n\nChanging the line ending is a very important step. Can be easily done through Sublime Text or Notepad++.\nIn Sublime Text, it can done from the View menu, then Line Endings.\nHope this helps","Q_Score":0,"Tags":"python,flask,heroku,nltk","A_Id":62639049,"CreationDate":"2020-05-04T18:44:00.000","Title":"'nltk.downloader' found in sys.modules after import of package 'nltk', but prior to execution of 'nltk.downloader';","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Single file spider which crawls only a site. Which informations can the owner of the site can see? \nHere, I am not using custom settings. (So that's default setting).\nExample: \n1.Spider name\n2.IP\n3.OS","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":37,"Q_Id":61602294,"Users Score":1,"Answer":"The site owner can see this info.\n\nSpider name. You can change the to anything you want\nIP address you can use a VPN or proxies to change it.\nBrowser you are using. To change this go to settings and go look for USER_AGENT\nremove the comment and you can easily go on google to search for other user-agents.\nCookies. Scrapy has cookies enables by default. Go to settings and look for COOKIES_ENABLED Remove the comment so it is set to False. This would make the scraping job more stealthy.\nConcurrent_Requests. This is so also in the settings. It is how many requests you make simultaneously. It is better to lower the number so it is more friendly to the website.","Q_Score":0,"Tags":"python,scrapy,web-crawler","A_Id":61603285,"CreationDate":"2020-05-04T21:54:00.000","Title":"Which information a site can get when scraped by a scrapy spider?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an 8 GB file with text lines (each line has a carriage return) in S3. This file is custom formatted and does NOT follow any common format like CSV, pipe, JSON ... \nI need to split that file into smaller files based on the number of lines, such that each file will contains 100,000 lines or less \n(assuming the last file can have the remainder of the lines and thus may have less than 100,000 lines).\n\nI need a method that is not based on the file size (i.e. bytes), but the number of lines. Files can't have a single line split across the two.\nI need to use Python.\nI need to use server-less AWS service like Lambda, Glue ... I can't spin up instances like EC2 or EMR.\n\nSo far I found a lot of posts showing how to split by byte size but not by number of lines. \nAlso, I do not want to read that file line by line as it will be just too slow an not efficient. \nCould someone show me a starter code or method that could accomplish splitting this 6 GB file that would \nrun fast and not require more than 10 GB of available memory (RAM), at any point?\nI am looking for all possible options, as long as the basic requirements above are met...\nBIG thank you!\nMichael","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":785,"Q_Id":61604448,"Users Score":1,"Answer":"boto3.S3.Client.get_object() method provides object of type StreamingBody as a response. \nStreamingBody.iter_lines() method documentation states:\n\nReturn an iterator to yield lines from the raw stream.\nThis is achieved by reading chunk of bytes (of size chunk_size) at a\n  time from the raw stream, and then yielding lines from there.\n\nThis might suit your use case. General idea is to get that huge file streaming and process its contents as they come. I cannot think of a way to do this without reading the file in some way.","Q_Score":1,"Tags":"python,amazon-web-services,amazon-s3,aws-lambda,aws-glue","A_Id":61608849,"CreationDate":"2020-05-05T01:52:00.000","Title":"Splitting a Large S3 File into Lines per File (not bytes per file)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Planning to build an end to end IOT application. I know that we can do it using Django and Flask. Which one is a better choice and how it is better?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":433,"Q_Id":61604978,"Users Score":1,"Answer":"I was in your position 2 months ago. Let me save you some trouble. \nFlask may seem the more flexible or direct path as it is easy to have something up and running in moments. Whereas Django, at times, can feel like an entirely different language, and takes much more time and effort to get running. Still, the problem lies in getting everything to play nicely with flask and other packages. This will be tricky and Django shines in this area. Once the project is rolling, it just works, and generally continues to do so unless the packages utilized in your app become deprecated or you break it.\nBoth are viable but any project of scale will be better off being maintained by Django while you focus on implementation. Good luck.","Q_Score":0,"Tags":"python,django,flask","A_Id":62110417,"CreationDate":"2020-05-05T02:57:00.000","Title":"Django vs Flask - Which framework is more powerful considering I want to design an end to end IOT solution","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Django dashboard application I wish to view from my browser. Django is running in a Docker container on one of Google's Compute Engine instances. The GCE instance is on a Google VPC, on which I've added firewall rules to open Django's port 8000. I've added my IP to Django's ALLOWED_HOSTS in settings.py. The container's logs indicate that it is running fine, yet when I access the GCE instance's IP from my browser, I am immediately unable to connect. I can ping the instance from my command line just fine. Is there something I'm missing here? Been stuck on this for a few hours now.\nNote: I have the Django container running on a \"Docker network\" in order for Celery to communicate with a RabbitMQ container. This was recommended to me somewhere, but I am unfamiliar with Docker networks or if they are causing the issue.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":471,"Q_Id":61621434,"Users Score":2,"Answer":"I have found the solution after a bit more trial-and-error. It was not very intuitive so I'll post here in case I can help anyone else.\nWhat fixed the issue for me was exposing the port (8000) on the command line when running the app's container:\ndocker run -p 8000:8000 ...\nThe reason this eluded me for so long was because I already expose the port in the Dockerfile: EXPOSE 8000, and when I run docker ps to list the ports exposed on each container, the container appeared to already be port-exposed: 8000\/tcp. However, what I didn't know is that it is supposed to look like: 0.0.0.0:8000->8000\/tcp.\nAnyways, hope this helps someone else out.","Q_Score":2,"Tags":"python,django,docker,google-cloud-platform,google-compute-engine","A_Id":61622310,"CreationDate":"2020-05-05T19:29:00.000","Title":"How do I access Django running on a Google Compute Engine VM from my browser?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Automation of Smart Home devices \nTo verify smart home devices like end-to-end (from mobile App to smart home devices).\nwhat are the automation framework you suggests.\n\nMobile App - developed Appium with python and Robot\nProduct - REST\nAPI calls.  Smart Devices - Verification of lights ON\/OFF, color\nchange, etc\n\nCan you please suggest or add any better methods to verify end-to-end.\nEG: Image comparison, any other method.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":76,"Q_Id":61626998,"Users Score":0,"Answer":"Actually it depends on two things:\n1- How the devices are calling each other. And whats is the main controller.\n2- Whats you purpose of testing? Testing the devices themselves or testing the functionality of the control panel and softwares?\nAbout CP and softwares:\nIf the system using API > Of course api-testing is required\nIf there are a panel and you can access it with browser> Using selenium for desktop and chromedriver for mobile browser\nIf there are a mobile app, using Appium\netc.\nFor the system itself, it is completely another field and responsibility of the electronic and robot engineers. And depends on hardwares. But the general way is I\/O checking. Means that engineers check the input signal with device actions and vice-versa.\nHope this helps.","Q_Score":0,"Tags":"python,automation,appium,robotframework","A_Id":61628161,"CreationDate":"2020-05-06T03:40:00.000","Title":"how to automate or verify smart home devices","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have string with html tags and I would like to pass formatting to power point.\nThe only idea I have now is to split it using some xml library and add bunch of ifs adding formatting to run depending on a tag.\nDid you encounter similar problem or have better idea how to approach it?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":680,"Q_Id":61636863,"Users Score":1,"Answer":"I don't think there is a method of doing this. For a start, some HTML elements and attributes aren't likely to translate.\nI've done a very limited amount of this - and actually it was mostly Markdown I was translating. (The HTML relevance is that I did work with entity references and also <br\/>.)\nI'm sorry to say my code is useless to you.\nMy advice would be to support a small subset of HTML. Perhaps <span> with some limited styling and things like <br\/>.","Q_Score":1,"Tags":"python,python-pptx","A_Id":61922406,"CreationDate":"2020-05-06T13:48:00.000","Title":"Python pptx - pass html formatted text to paragraph in powerpoint","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I updated my code, saved it and then when I try to run it I keep getting old code that isn't there anymore. I restarted the session and deleted the old file and created a new one...still happening. Any ideas?\nThanks in advance.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":321,"Q_Id":61643118,"Users Score":1,"Answer":"Try selecting  : Execute in a dedicated console under Run --> Configure will start a new IPython Console every time the Demo.py program is executed. \nMain use of this mode over Execute in current console is that we can be certain that there are no global objects defined in this Console which originate from debugging and repeated execution of our code. Every time we run the code in the Editor, the IPython Console in which the code runs is restarted.\nIf it related to some existing values you can clear by : \ndef clear_all()","Q_Score":0,"Tags":"python,spyder,reverse","A_Id":61643460,"CreationDate":"2020-05-06T18:55:00.000","Title":"Spyder keeps displaying old code when Run","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"How can I detect this? Currently I can only do_something if the user clicks a back button and I manually disconnect from the websocket under consideration. Sometimes Websocket DISCONNECT fires, but much of the time it doesn't.\nIf a user refreshes or leaves a page, the disconnect code cannot run. How can I detect when a user leaves\/refreshes?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":160,"Q_Id":61646084,"Users Score":0,"Answer":"there is not perfect way to do this. The main issue is due to TCP the server will not always know that the connection has been dropped until it times out.\nhowever Daphne has 2 options you can configure to help with this --ping-interval and --ping-timeout if you want rapid disconnects then I suggest you set these values to be nice and low.","Q_Score":0,"Tags":"python,django,django-channels","A_Id":61646997,"CreationDate":"2020-05-06T21:53:00.000","Title":"django-channels 1.x detect when user leaves\/refreshes page","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to extract entities from the pdf and mark it back to pdf using pdf annotation. \nIs there any way I can annotate specific text using ghostscript?\nThanks","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":93,"Q_Id":61652829,"Users Score":1,"Answer":"You're going to have to be more specific. What do you mean by 'annotate specific text' ? Are you talking about;\n\nAltering a FreeText annotation ?\nFinding text in a content stream and altering it ?\nAdding an annotation at a specific point on the page ?\nSomething else ?\n\nGhostscript is not intended as a general purpose PDF editing tool, and so it's quite limited in what you can do with it. You might be better advised to use something like MuPDF, but so much depends on exactly what you are trying to do, it's not really possible to make any specific recommendations.","Q_Score":0,"Tags":"python,ghostscript","A_Id":61654499,"CreationDate":"2020-05-07T08:07:00.000","Title":"Annotate specific text in pdf using ghost script","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I would like to know if it is possible to convert the user selected excel file to CSV using django pre_save signals. Suppose a user uploads 'test.xlsx', I would like to convert that file automatically using the pre_save signal. Once the user uploads the file, it should actually be 'test.csv' in my FileField.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":76,"Q_Id":61655929,"Users Score":0,"Answer":"Yes, you could do it in pre_save, but preferably just do this in the Django form or DRF serializer that handles the upload. That way you can bubble up conversion errors to the user as validation errors, etc.\nAssuming the field in your model is upload, you'd use\n\nclean_upload(self, file) in Django forms.\nvalidate_upload(self, file) in DRF serializers.\n\nJust return a new ContentFile() with your converted content from one of those.","Q_Score":0,"Tags":"python,django,python-3.x,django-rest-framework","A_Id":61655978,"CreationDate":"2020-05-07T10:49:00.000","Title":"Is there a way to convert the uploaded excel file to CSV using django pre_save signal?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I changed my index.html template so that it would extend base.html. And also changed the content of index.html a little. But Flask keeps loading unchanged version of index.html\nI've tried following:\n\nDeleted index.html temporarily. Flask started to complain jinja2.exceptions.TemplateNotFound: index.html\nThe same happens if I change the name of file to be used here return render_template('index.html')\nTo make sure that Atom editor really applies changes to the file on my server, I opened the file with nano over ssh. Changes are really there.\nCleared browser cache. Tried different browsers. Old version of html template is loaded.\n\nI have no more ideas. \nDo you have any idea what else should be checked?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":382,"Q_Id":61662872,"Users Score":1,"Answer":"This is very strange but it was solved by RESAVING base.html. \nThough base.html was on server, when I did some changes to it and resaved, Flask started to load the new version of index.html.\nI have no idea how this worked.","Q_Score":0,"Tags":"python,flask,jinja2","A_Id":61663345,"CreationDate":"2020-05-07T16:26:00.000","Title":"Flask keeps loading old version of HTML template","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've created a Flask app and am trying to deploy it for testing on an EC2 machine using Flask's micro web framework (just for testing purposes). I'm serving the app on host=0.0.0.0  and port=80 yet everytime I try and run the app it throws this error PermissionError: [Errno 13] Permission denied on all ports . The weird thing is when I use app.run() without any arguments meaning that it serves the app on the localhost address of the machine and the default port 5000, it runs without a problem. I have opened access to all incoming HTTP requests to port 80 in the AWS console. Can anyone help?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":587,"Q_Id":61665649,"Users Score":0,"Answer":"Port 80 and 443 requires special permission. Try running your flask application with sudo in front of your command.\nExample: sudo python3 main.py.","Q_Score":1,"Tags":"python,amazon-web-services,flask,amazon-ec2","A_Id":61666397,"CreationDate":"2020-05-07T18:56:00.000","Title":"Permission denied when trying to deploy Flask app on AWS EC2","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using VSCode. When I enable Django Template, HTML autocomplete doesn't work. I want to code Python and HTML at the same time. How can I solve this problem? Any ideas?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1715,"Q_Id":61669007,"Users Score":8,"Answer":"in VSCode's settings.json, add the following : emmet.includeLanguages\": {\"django-html\": \"html\"}","Q_Score":3,"Tags":"python,html,django,visual-studio-code","A_Id":61669093,"CreationDate":"2020-05-07T22:41:00.000","Title":"Why does Django template prevent HTML autocomplete from functioning?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to come up with a way to scrape information on houses on Zillow and I am currently using xpath to look at data such as rent price, principal and mortgage costs, insurance costs. \nI was able to find the information using xpath but I wanted to make it automatic and put it inside a for loop but I realized as I was using xpath, not all the data for each listing has the same xpath information. for some it would be off by 1 of a list or div. See code below for what I mean. How do I get it more specific? Is there a way to look up for a string like \"principal and interest\" and select the next value which would be the numerical value that I am looking for?\nworks for one listing:\ndriver.find_element_by_xpath(\"\/html\/body\/div[1]\/div[6]\/div\/div[1]\/div[1]\/div[1]\/ul\/li[1]\/article\/div[1]\/div[2]\/div\")\na different listing would contain this:\ndriver.find_element_by_xpath(\"\/html\/body\/div[1]\/div[6]\/div\/div[1]\/div[1]\/div[2]\/ul\/li[1]\/article\/div[1]\/div[2]\/div\")","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":77,"Q_Id":61672860,"Users Score":0,"Answer":"selecting multiple elements using xpath is not a good idea. You can look into \"css selector\". Using this you can get similar elements.","Q_Score":0,"Tags":"python,selenium","A_Id":61673109,"CreationDate":"2020-05-08T05:52:00.000","Title":"Selenium scraping","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I currently have a ManytoManyField in Django where I can Select multiple Users with strg and mouseclick.\nWith much more Users it gets heavily complicated to search the User I want to select.\nIs there a possibility to have a ManytoManyField, but also have a search_field for Users, so I can search and pick.\nThank you for your help!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":31,"Q_Id":61675368,"Users Score":0,"Answer":"I found the answer. What I was searching for was filter_horizontal = '# put ManytoManyField reference name here'","Q_Score":0,"Tags":"python,django,python-3.x,django-models,django-admin","A_Id":61726630,"CreationDate":"2020-05-08T08:46:00.000","Title":"Implement Search field in ManytoManyField(Django Admin) models.py","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I\u2019ve looked through this forum and couldn\u2019t find a clear answer to helping my situation. \nTo explain: I\u2019m currently trying to develop an IOT device that mainly consists of a raspberry pi 3. As it\u2019s for a start up business idea I want to reduce costs and not have a server on the cloud. \nI thought it would be a good idea to have flask run with gunicorn on the pi and this would be accessed by a desktop app or mobile app that would know the IP address of the pi as well as it\u2019s flask endpoints. \nI wanted the pi to be accessible from any other network (not just its local one). I have host on \u201c0.0.0.0\u201d and port 5000 for development but can\u2019t access it through my mobile network. \nI have seen similar posts mentioning ngrok (which might make data less secure?). I\u2019ve seen that I might have to forward the port of the pi to the router. But I think this might involve accessing the router set up. And I don\u2019t want to have to do this for every new client. \nI have checked other posts on the forum but can\u2019t seem to find what I\u2019m looking for. \nCan I ask this forum if my understanding is correct? Can anyone help me out? \nAny advice would be greatly appreciated!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":595,"Q_Id":61675492,"Users Score":0,"Answer":"If I understood the problem correctly,\nIf you want to connect to your raspberry pi remotely you should know the IP address of your raspberry pi and need port forwarding. After that, you can connect to your raspberry pi with a public ip address. For example publicraspberrypiaddress:5555 (which port are you using)\nNgrok gives a random subdomain for connection so I don't know how you recognize the ngrok url when device is not near of you.\nAlternatively, you can use cotunnel. It gives static url and the device appears on the cotunnel dashboard so you can manage your raspberry pi remotely with ssh terminal too. \nOr you should develop your own tunnel-like service, or change your project structure. I don't know another way.","Q_Score":0,"Tags":"python,flask,raspberry-pi3,ip-address","A_Id":61699730,"CreationDate":"2020-05-08T08:54:00.000","Title":"Accessing IOT raspberry pi outside of network using flask with Gunicorn","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"What does it mean to \"render a template\" or to \"render a form\" in Django?\nExample 1: \"Generally a view retrieves data according to the parameters, loads a template and renders the template with the retrieved data.\nExample 2: \"Rendering a form in a template involves nearly the same work as rendering any other kind of object\"\nWould the meaning of render in the above two examples be to \"provide\" or give\"?","AnswerCount":3,"Available Count":1,"Score":0.0665680765,"is_accepted":false,"ViewCount":121,"Q_Id":61677483,"Users Score":1,"Answer":"Rendering a template is indeed always about producing content, but for a slightly wider description of content. It could be a chunk of html, for example an ajax call to get new items might produce some html describing the new items, but it doesn't have to be.\ncreds. Frederick Cheung","Q_Score":0,"Tags":"python,django","A_Id":61677603,"CreationDate":"2020-05-08T10:52:00.000","Title":"What does \"render\" mean in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a quite complex software system which was developed in ruby and has been now all \"translated\" and transported into python. The last thing which is left is a series of *.txt.erb templates. I would like to leave them as they are but have a python library which does what the old ruby routine was doing, that is creating a series of *.txt files which follow the *.erb templates structure. I have looked a lot around but I cannot find an answer. \nProbably for a more expert python programmer this might be a simple question.\nThanks a lot for your help!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":118,"Q_Id":61683706,"Users Score":0,"Answer":"I've solved the problem changing the *txt.erb templates into *.txt files and I've coded a python script which reads the file and substitute the general variable into the specific variable I want to, for both file content and file name.\nThank you for the help!","Q_Score":0,"Tags":"python,ruby,erb,templating","A_Id":61770422,"CreationDate":"2020-05-08T16:33:00.000","Title":"How to read\/translate *txt.erb template (ruby) with python script","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is there a Python3 library which will determine if we are running on GCP or another cloud architecture as opposed to a native architecture?\nSomething like platform.platform() or jaraco.docker.is_docker(), but for the cloud?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":119,"Q_Id":61690480,"Users Score":0,"Answer":"No, simply because the Python codes actually running in a virtual machine in the cloud.","Q_Score":0,"Tags":"python-3.x,google-cloud-platform,architecture,cloud","A_Id":61690531,"CreationDate":"2020-05-09T01:05:00.000","Title":"Python3 Determine if a Program is Running on GCP?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a Python Django web application.\nIn Get method how to prevent the user from entering url and access the Data.\nHow do i know weather the url accessed by Code or Browser.\nI tried with sessionid in Cookie, But if session exist's it allow to access the data.\nThanks.","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":168,"Q_Id":61695188,"Users Score":0,"Answer":"To detect if request is from browser, you can check HTTP_USER_AGENT header\nrequest.META.get(\"HTTP_USER_AGENT\")","Q_Score":0,"Tags":"django,python-3.x","A_Id":61699310,"CreationDate":"2020-05-09T10:23:00.000","Title":"Prevent the user with session from entering the URL in browser and access the data in Python Django Application","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Python Django web application.\nIn Get method how to prevent the user from entering url and access the Data.\nHow do i know weather the url accessed by Code or Browser.\nI tried with sessionid in Cookie, But if session exist's it allow to access the data.\nThanks.","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":168,"Q_Id":61695188,"Users Score":0,"Answer":"I achieve it by \nif 'HTTP_REFERER' not in request.META:\nit not exist's when hit directly from browser url.","Q_Score":0,"Tags":"django,python-3.x","A_Id":61700613,"CreationDate":"2020-05-09T10:23:00.000","Title":"Prevent the user with session from entering the URL in browser and access the data in Python Django Application","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an app that uses the Spacy model \"en_core_web_sm\". I have tested the app on my local machine and it works fine.\nHowever when I deploy it to Heroku, it gives me this error:\n\"Can't find model 'en_core_web_sm'. It doesn't seem to be a shortcut link, a Python package or a valid path to a data directory.\"\nMy requirements file contains spacy==2.2.4.\nI have been doing some research on this error and found that the model needs to be downloaded separately using this command:\npython -m spacy download en_core_web_sm\nI have been looking for ways to add the same to my requirements.txt file but haven't been able to find one that works!\nI tried this as well - added the below to the requirements file:\n-e git:\/\/github.com\/explosion\/spacy-models\/releases\/download\/en_core_web_sm-2.2.0\/en_core_web_sm-2.2.0.tar.gz#egg=en_core_web_sm==2.2.0\nbut it gave this error:\n\"Cloning git:\/\/github.com\/explosion\/spacy-models\/releases\/download\/en_core_web_sm-2.2.0\/en_core_web_sm-2.2.0.tar.gz to \/app\/.heroku\/src\/en-core-web-sm\nRunning command git clone -q git:\/\/github.com\/explosion\/spacy-models\/releases\/download\/en_core_web_sm-2.2.0\/en_core_web_sm-2.2.0.tar.gz \/app\/.heroku\/src\/en-core-web-sm\nfatal: remote error:\n           explosion\/spacy-models\/releases\/download\/en_core_web_sm-2.2.0\/en_core_web_sm-2.2.0.tar.gz is not a valid repository name\"\nIs there a way to get this Spacy model to load from the requirements file? Or any other fix that is possible?\nThank you.","AnswerCount":3,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":7657,"Q_Id":61702357,"Users Score":4,"Answer":"Ok, so after some more Googling and hunting for a solution, I found this solution that worked:\nI downloaded the tarball from the url that @tausif shared in his answer, to my local system.\nSaved it in the directory which had my requirements.txt file.\nThen I added this line to my requirements.txt file: .\/en_core_web_sm-2.2.5.tar.gz\nProceeded with deploying to Heroku - it succeeded and the app works perfectly now.","Q_Score":16,"Tags":"python,git,heroku,spacy","A_Id":61708393,"CreationDate":"2020-05-09T19:15:00.000","Title":"How to add a Spacy model to a requirements.txt file?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a fairly old website running Django 1.11 and Python 2.7. I am not sure why it doesn't seem to be updating. \nI upgraded Python3.5 to Python3.7 just now. Deleted the old virtualenv (by deleting app\/bin and creating a new virtualenv with virtualenv --python=\/usr\/bin\/python3 . ) \nWhen in the virtualenv, if I do a python -V I get Python 3.7.7. If I run django-admin --version I see 3.0.6. \nBut when I try to run the server, my Traceback says: \nFile \"\/usr\/local\/lib\/python2.7\/dist-packages\/django\/core\/handlers\/exception.py\" in inner\n 41.             response = get_response(request)\nSo it's still pointing at apparently an old global install? How can I point it to the new version in the virtualenv I've created?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":78,"Q_Id":61703296,"Users Score":0,"Answer":"Okay, I figured it out. I was using sudo to install virtualenv, python and django because the folder in the root directory, \/webapps was root owned. Even in virtualenv, sudo is a global installer, and so my installs were going to the main \/usr folder, where there were now two django installs, 1.11 in the python2.7 folder, and 3.06 in the python3.7 folder. \nI deleted the virtualenv, ran CHMOD 777 on my \/webapps folder so my regular account could create a virtualenv without sudo, and could run pip3 without sudo, which installed my software locally and now everything is working.","Q_Score":0,"Tags":"python,django","A_Id":61713305,"CreationDate":"2020-05-09T20:29:00.000","Title":"Upgrading Django 1.11 to 3.X\/Python2.7 to 3.7","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've created an API using Flask-RESTFUL package for Python 3.7.\nI'd like to know what the proper approach would be for returning data to a user based on which columns he should have access to.\nFor example, if I have an \"orders\" table with (order_id, order_date, price, ebay_name, revenue), but want User A and User B to have access to different data. Let's say that on route \/get_data, I return all fields, but User A should have access to all data, while User B only can see the revenue field.\nMy current approach:\nWhile building the JWT token when a user logins in and authenticates, would it be acceptable to store the column names of the \"orders\" table in the actual token? Then, when the user goes to the \/get_data route, I would basically check the column names stored in the JWT and build the MySQL query with the column names found in the token (select all_columns_in_jwt from orders). I worry that exposing the table columns in the JWT token is not the best approach.\nAnother idea would be to check within a user permissions table each time the \/get_data route is hit.\nDoes anyone have a suggestion for implementing this in a more efficient way?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":300,"Q_Id":61707553,"Users Score":0,"Answer":"I would do it using user permissions but you could also create separate procedures for either each individual user or groups of users based on their roles\/permissions which create\/replace specific views of the tables allowing the user to see only what you want them to see. For example, upon any changes to the table (or alternatively, upon login for a user\/member of a user group) you could run the procedure to generate (or replace if it already exists) a view on the table for either each user or each user group which you want to restrict access to, and then your API would select data from the view rather than directly from the table\nWith user permissions (this is very similar to how I implement it in my own apps) you could create a permissions table and then a table of the permissions which users possess. Then, on using an API, you could query the user's permissions and using a map which you store somewhere in your code base you could look up the columns based on a combination of the relevant user permission and the relevant table and use the resulting column set as what you select in your query","Q_Score":0,"Tags":"python,mysql,flask,jwt,flask-restful","A_Id":61708552,"CreationDate":"2020-05-10T05:22:00.000","Title":"proper way to grant permissions to specific data JWT MySQL Flask-Restful Python","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is there anything that someone could point me towards (a package, an example, a strategy, etc) of how I could implement the ability for an end user of my app to create a new field in a model, then add that model field to a model form and template? I\u2019m thinking of the way that Salesforce allows users to add Custom fields.\nI don\u2019t really have any start point here I am only looking to learn if\/how this might be possible in Django.\nThanks!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":34,"Q_Id":61711629,"Users Score":0,"Answer":"I'm also looking for same type of solution. But with some research, I came to know that we have this using ContentTypes framework.\nHow to do it? We can utilize ContentType's GenericForeignKeys and GenericRelations.","Q_Score":0,"Tags":"python,django","A_Id":67532664,"CreationDate":"2020-05-10T12:01:00.000","Title":"Allow End User To Add To Model, Form, and Template Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Hi i am using checkmarx for static code analysis. The checkmarx document says it only supports Django framework from python. May i know if checkmarx supports python's cherrypy framework ?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":53,"Q_Id":61712540,"Users Score":1,"Answer":"The problem with checkmarx is the version of Python. Checkmarx support Python 2.6, 2.7 and 3.4 . \nPython version more recent that 3.4 are not supported and you may experience parsing or analyse issues","Q_Score":0,"Tags":"python-3.x,cherrypy,checkmarx","A_Id":61723328,"CreationDate":"2020-05-10T13:08:00.000","Title":"Does checkmarx support python's cherrypy framework?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working with Django right now and when I installed it through the command prompt I made a virtualenv called test, now I went into vs code and I am trying to open it up by saying workon test but it's not going into the virutalenv. I am on windows and I am using visual studio code.","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":369,"Q_Id":61714931,"Users Score":0,"Answer":"In cmd typing test\/Scripts\/activate worked, but in vscode terminal, I had to cd till the Scripts and then type .\\activate.","Q_Score":0,"Tags":"python,virtualenv","A_Id":71579493,"CreationDate":"2020-05-10T16:04:00.000","Title":"Why isn't my virtualenv opening up in visual studio code?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working with Django right now and when I installed it through the command prompt I made a virtualenv called test, now I went into vs code and I am trying to open it up by saying workon test but it's not going into the virutalenv. I am on windows and I am using visual studio code.","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":369,"Q_Id":61714931,"Users Score":0,"Answer":"just go to the left below corner where your python version is written click it, it will open the command palette where select the virtual env. (with its name) that's is test and press ok.\nAfter that open new terminal and you will get what you want","Q_Score":0,"Tags":"python,virtualenv","A_Id":70324944,"CreationDate":"2020-05-10T16:04:00.000","Title":"Why isn't my virtualenv opening up in visual studio code?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to use MariaDb for my flask app. \nSo I try to make connection like in documentation, are any orm which support this db?\nDoes peewee support MariaDb. How can i use peewee orm for connection to MariaDb?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":443,"Q_Id":61716850,"Users Score":3,"Answer":"Yes, it supports MariaDB in the same way that it supports MySQL. MariaDB speaks the mysql protocol and uses the mysql drivers. So just use MySQLDatabase.","Q_Score":0,"Tags":"python,mariadb,peewee","A_Id":61738558,"CreationDate":"2020-05-10T18:27:00.000","Title":"MariaDb and Peewee","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In my module I have an entity \"Person\" with two fields \"date_of_birth\" (Date)  and \"age\" (Integer). How can I get the age of a Person from the date of birth and give that value to the age field?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":854,"Q_Id":61719266,"Users Score":0,"Answer":"The datetime.timedelta() function will do it.","Q_Score":1,"Tags":"python,odoo","A_Id":61720512,"CreationDate":"2020-05-10T21:58:00.000","Title":"How to get a person's age from his date of birth in Odoo?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"We have teh need to interact with our customers AD from Jira in order to handle automatically user onboarding.\nFor that we have 2 deifferent approach :\n\nUsing Microsoft Graph API\nWe call directly from Jira Script Runner plugin using groovy script POST and GEt methods, this directly within Jira environment\nUsing Microsoft Azure SDk for python\n\nUsing this approach will need to build a python script which is store in the dedicated location on the VM and calling that scrip from Jira using Groovy script\nIn the first approach we are using only 4 API call only for how request and we are all time scripting within Jira environement.\nON the second approach we need to deal with 2 types of script ( python and groovy)\nBased on your advise, do you see what could be the best based on your experience in order to help me chose one or the other ?\nThanks for help\nregards","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":182,"Q_Id":61730467,"Users Score":0,"Answer":"I would follow up to Laurent, and say, the better solution is the solution that has the least amount of complexity while accomplishing everything you need to do. \nIn this case according to your own post, that is clearly just calling graph API directly from your groovy scripting in Jira.","Q_Score":0,"Tags":"groovy,azure-active-directory,jira,azure-sdk-python","A_Id":61735494,"CreationDate":"2020-05-11T13:07:00.000","Title":"What is the main Ad's and Con's using MS Graph API vs MS Azure SDK","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"So I am trying to create a binary file and save it into my database. I am using REDIS and SQLALCHEMY as a framework for my database. I can use send_file to send the actual file whenever the user accesses a URL but how do I make sure that the file is saved in the route and it could stay there every time a user accesses the URL.\n\nI am sending the file from a client-python it's not in my\n  directory\n\nwhat I need in a nutshell is to save the file from the client-python to a database to \"downloadable\" it to the browser-client so it would actually be available for the browser-client is there any way of doing this? Maybe a different way that I didn't think about","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":500,"Q_Id":61735124,"Users Score":0,"Answer":"I had to encode the data with base64, send it to the database and then decode it and send the file as binary data.","Q_Score":0,"Tags":"python,database,flask,redis,sendfile","A_Id":61975147,"CreationDate":"2020-05-11T16:59:00.000","Title":"Python - save BytesIO in database","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have downloaded odoo9 source code from https:\/\/www.github.com\/odoo\/odoo --depth 1 --branch 9.0 --single-branch .\n and started the odoo server but i see \"ImportError: No module named werkzeug.utils\" error.\nI tried installing with \nsudo apt-get install -y python3-werkzeug and could see it is installed successfully.\nAgain when I run the server I still see the same import issue.\nhow could I fix this import errors when I already installed them.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":2913,"Q_Id":61745614,"Users Score":0,"Answer":"Odoo 9.0 is no longer supported since long ago, and it only works with Python 2, so you'd have to install python2-werkzeug instead (if available).\nOnly Odoo 11.0 and newer run under Python 3.","Q_Score":1,"Tags":"python,odoo","A_Id":61748697,"CreationDate":"2020-05-12T06:56:00.000","Title":"ImportError: No module named werkzeug.utils","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"The pretty straight forward way to do this is to upload the google-provided.html file to the root folder of your app on the server. But how to do it for a flask application?\nFor example, I have a flask app running on heroku and I want to do the site verification for my app using html file upload method(though alternative methods are available). I tried uploading the google-provided.html in the templates folder. Verification failed!\nI have searched the internet but found no relevant answers.","AnswerCount":2,"Available Count":1,"Score":-0.0996679946,"is_accepted":false,"ViewCount":414,"Q_Id":61750262,"Users Score":-1,"Answer":"Everything mentioned in the above answer is correct. But, just make sure that you don't rename the file given from google search console. Use the same name as it is.","Q_Score":0,"Tags":"python-3.x,flask,heroku,google-search-console","A_Id":68856563,"CreationDate":"2020-05-12T11:13:00.000","Title":"How to use html file upload method for google site verification for a flask app","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Django 3.0.5 under Kalilinux2020.1 launched from a virtual machine on VMWARE ESXI.\nI want to make my project public but it's not working.\nI modified the settings.py and add :\nALLOWED_HOSTS = ['*']\nThe django server is launched using \npyhton3 manage.py runserver 0.0.0.0:8080\nI allowed the port 8080 in the firewall using \nfirewall-cmd --zone=public --add-port=8080\/tcp \nand I forwarded the port 8080 in the router\nP.S: I can access to my server from the other machines in the VMWare (LAN) but i can't get access from outside.\nAnyone has faced this problem?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":99,"Q_Id":61759180,"Users Score":0,"Answer":"I just find out the solution,\nI changed the port to be forwarded from 8080 to 9001 and it works like charm now.\nThank you.","Q_Score":0,"Tags":"django,python-3.x,networking,firewall","A_Id":61759896,"CreationDate":"2020-05-12T18:21:00.000","Title":"Django access from outside VMWARE (Public access)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm using Django 3.0.5 under Kalilinux2020.1 launched from a virtual machine on VMWARE ESXI.\nI want to make my project public but it's not working.\nI modified the settings.py and add :\nALLOWED_HOSTS = ['*']\nThe django server is launched using \npyhton3 manage.py runserver 0.0.0.0:8080\nI allowed the port 8080 in the firewall using \nfirewall-cmd --zone=public --add-port=8080\/tcp \nand I forwarded the port 8080 in the router\nP.S: I can access to my server from the other machines in the VMWare (LAN) but i can't get access from outside.\nAnyone has faced this problem?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":99,"Q_Id":61759180,"Users Score":0,"Answer":"The network adapter in your VM, it should be either Brigde or NAT either way it can't be accessible other hosts","Q_Score":0,"Tags":"django,python-3.x,networking,firewall","A_Id":61759797,"CreationDate":"2020-05-12T18:21:00.000","Title":"Django access from outside VMWARE (Public access)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've created a Python simple server.py and client.py chat.\nI was wondering if it is possible to deploy server.py on heroku so that it's always running and I can access the server from any client.py at any time.\nI've tried deploying the simple server.py to heroku but it doesn't print anything in the logs section and it seems like it didn't even start the code as it should print \"server on\" but it doesn't.\nI think that I'm missing something in the Procfile or in the requirements.txt file.\nIs there another way to do this?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":64,"Q_Id":61762007,"Users Score":0,"Answer":"Try heroku ps:scale web=1 so your dyno can work","Q_Score":0,"Tags":"python,sockets,heroku,server","A_Id":61807922,"CreationDate":"2020-05-12T21:11:00.000","Title":"python heroku socket server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to install Beautiful Soup 4, but every tutorial or list of instructions seems to assume I know more than I do. I am here after a number of unsuccessful attempts and at this point I am afraid of damaging something internally.\nApparently I need something called pip. I have Python 3.8, so everyone says I should have pip. Great. I have found no less than 14 different ways to check if I actually have pip and am using it. They all say to type something. One of them said to type pip --version. We are already assuming too much. Where do I type it? IDLE? The Cmd prompt? The Python shell? What folder do I need to be in? Etc Etc. I need someone to assume I am a complete beginner.\nThen, how do I use it to install bs4? Again, I am supposed to type things, but no one says where. One person said to go to the folder where python is installed in the command line. So, I did, and surprise surprise, pip is not \"valid syntax\". How can I proceed with this?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":239,"Q_Id":61765096,"Users Score":0,"Answer":"With a little help from the kind user Tenacious B, I have solved my problem, I think. In the command prompt, I needed to type \ncd C:\\Users\\%userprofilenamegoeshere%\\AppData\\Local\\Programs\\Python\\Python38-32\\scripts \nNo source that I found in my initial search included that last bit: \\scripts. From here, the common suggestion of pip install beautifulsoup4 seems to have worked.","Q_Score":0,"Tags":"python,beautifulsoup,pip","A_Id":61765420,"CreationDate":"2020-05-13T01:59:00.000","Title":"How to install Beautiful Soup 4 without *any* assumptions","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"We are trying to fetch event and calendar information for user through Graph API. User is present on Azure Active directory and has active o365 subscription. \/events or \/calendar APIs  are not working. Is it possible to do so through non work premium Microsoft accounts?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":66,"Q_Id":61790857,"Users Score":0,"Answer":"you mention its a personal premium account, then you say user is present in azure ad.. there are a few conflicting statements here, if you could clarify, \nthere are no such thing as a personal premium account. Microsoft 365 is either business premium, personal or family. there is no personal premium.. \nIf it is a personal office 365 account, then it does not have Azure ad. and you can only grab limited data for that user through graph, by using the \/me endpoint. i would highly doubt that you could access a personal account's calendar.\nif you are talking about a business premium account, then that comes with azure ad, and you should be able to interact with the users through graph as per documentation. but you would still need to grant more permissions for calendar for example to read someone elses calendar. \nIf it is a personal o365 account that you added to a different o365 business tenant, that user still does not belong to your tenant, because at its base its still a personal account with no real azure ad tenant. \nhopefully that clarifies a bit.","Q_Score":0,"Tags":"python,graph,microsoft-graph-api,azure-ad-graph-api","A_Id":61798846,"CreationDate":"2020-05-14T06:37:00.000","Title":"Is it possible to fetch user event data using Graph API for personal premium Microsoft accounts","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"hope you are all doing well.\nIm working on api project using python and flask.\nThe question I have to ask is, how can I get the values of multiple query string parameter?\nThe api client is built in PHP, and when a form is submitted, if some of the parameters are  multiple the query string is built like filter[]=1&filter[]=2&filter[]=3... and so on.\nWhen I dump flask request, it shows something like (filter[], 1), (filter[], 2), (filter[], 3), it seems ok, but then when I do request.args.get('filter[]') it returns only the first item in the args ImmutableDict, filter[]=1, and I can't access the other values provided.\nAny help regarding this issue would be aprreciated.\nHappy programming!","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":397,"Q_Id":61800268,"Users Score":0,"Answer":"try this request.args.to_dict(flat=False) to convert","Q_Score":0,"Tags":"python,flask","A_Id":61800722,"CreationDate":"2020-05-14T14:44:00.000","Title":"Flask Python - multiple URL parameter with brackets","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a pyramid API which has basically three layers. \n\nView -> validates the request and response\nController -> Does business logic and retrieves things from the DB.\nServices -> Makes calls to external third party services. \n\nThe services are a class for each external API which will have things like authentication data. This should be a class attribute as it does not change per instance. However, I cannot work out how to make it a class attribute. \nInstead I extract the settings in the view request.registry.settings pass it to the controller which then passes it down in the init() for the service. This seems unnecessary. \nObviously I could hard code them in code but that's an awful idea. \nIs there a better way?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":102,"Q_Id":61802722,"Users Score":2,"Answer":"Pyramid itself does not use global variables, which is what you are asking for when you ask for settings to be available in class-level or module-level attributes. For instance-level stuff, you can just pass the settings from Pyramid into the instance either from the view or from the config.\nTo get around this, you can always pass data into your models at config-time for your Pyramid app. For example, in your main just pull settings = config.get_settings() and pass some of them to where they need to be. As a general rule, you want to try to pass things around at config-time once, instead of from the view layer all the time.\nFinally, a good way to do that without using class-level or module-level attributes is to register instances of your services with your app. pyramid_services library provides one approach to this, but the idea is basically to instantiate an instance of a service for your app, add it to your pyramid registry config.registry.foo = ... and when you do that you can pass in the settings. Later in your view code you can grab the service from there using request.registry.foo and it's already setup for you!","Q_Score":1,"Tags":"python,pyramid","A_Id":61937789,"CreationDate":"2020-05-14T16:41:00.000","Title":"Accessing Pyramid Settings throughout the program","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an endpoint that renders a template that has a list of movies\nOn the page, there is a button called \"Add movie\" and an input field to add the name of the movie. When the button is pressed, I want to add a movie of the name to the list of movies and re render the page.\nRight now, I am doing it all in JS, with a fetch request, but I can't re render the page like this.\nHow could I achieve the effect I want?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":167,"Q_Id":61807125,"Users Score":0,"Answer":"You're rendering on the server-side, so in order to re-render, you need to send data back to the server. One way of doing this creating a form element which posts data to the same page when you click the button. And then on the server side, take the inputted movie, add it to the other movies, and then you can re-render and return.\nThis answer attempts to provide general guidance, since your question was general.","Q_Score":0,"Tags":"python,django","A_Id":61808132,"CreationDate":"2020-05-14T20:48:00.000","Title":"Re-render page from JS Django Template","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have 10 microservices in django. I am running all microservices in different tab in terminal on localhost.So I want to run all microservices in single tab. I don't want to open multiple tab. Is there any way to do so?\nThanks in Advance","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":348,"Q_Id":61814630,"Users Score":0,"Answer":"I suggest to use docker for micro services.\nI have currently deployed my django application in production environment using docker I can manage them using docker-compose.\nAlternatively you can create shell script file for each micro service where you can define there own environment settings.","Q_Score":0,"Tags":"django,python-3.x,localhost,microservices","A_Id":61816975,"CreationDate":"2020-05-15T08:08:00.000","Title":"Run multiple microservices in single tab","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"In my project which deals with SAS \nwe have risk binary files of extension .rskcdesc\nI have been looking but not able to find any python Java library which can read it.\n I need to automate data checks via Backend process, hence need a way to decode these files.\nAny suggestions?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":36,"Q_Id":61816784,"Users Score":0,"Answer":"Rohit,\nI don't have SAS Risk but SAS has been using zip for some of their files (like EG projects). Try renaming the file extension to .zip and open it. It may be comprised of XML files, similar to EG.","Q_Score":0,"Tags":"java,python,sas,risk-analysis","A_Id":61821507,"CreationDate":"2020-05-15T10:09:00.000","Title":"open SAS risk file extension of .rskcdesc","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In my django application, I used to authenticate users exploiting base django rest framework authentication token. Now I've switched to Json Web Token, but browsing my psql database, I've noticed the table authtoken_token, which was used to store the DRF authentication token, is still there. I'm wondering how to get rid of it. I've thought about 2 options:\n\ndeleting it through migration: I think this is the correct and safer way to proceed, but in my migrations directory inside my project folder, I didn't find anything related to the tokens. Only stuff related to my models;\ndeleting it directly from the database could be another option, but I'm afraid of messing with django migrations (although it shoudn't have links with other tables anymore)\n\nI must clarify I've already removed rest_framework.authtoken from my INSTALLED_APPS","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":1081,"Q_Id":61817823,"Users Score":1,"Answer":"You can choose the first option. There are 3 steps should you do to complete uninstall authtoken from your Django app\n\nRemove rest_framework.authtoken from INSTALLED_APPS, this action will tell your Django app to do not take any migrations file from that module\nRemove authtoken_token table, if you will\nFind the record with authtoken app name in table django_migrations, you can remove it.\n\nNote: There are several error occurs in your code, because authtoken module is removed from your INSTALLED_APPS. My advice, backup your existing database first before you do above step","Q_Score":2,"Tags":"python,django,django-rest-framework,django-migrations,django-database","A_Id":61818577,"CreationDate":"2020-05-15T11:10:00.000","Title":"Django: safely deleting an unused table from database","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"i've been trying djano project that include channels & redis. recently i recreated venv and i get following even after deleting mistaken line. is there a way to clear cache in django project and runserver again? \n''' line 52, in message\n    to = models.ForeignKey(to='user',on_delete='',related_name = 'to')\n  File \"\/home\/\/python-projects\/DjangoChannels\/.env\/lib\/python3.8\/site-packages\/django\/db\/models\/fields\/related.py\", line 801, in init\n    raise TypeError('on_delete must be callable.')\nTypeError: on_delete must be callable.'''","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":67,"Q_Id":61818423,"Users Score":0,"Answer":"i've just reinstalled python from source and problem was gone!","Q_Score":0,"Tags":"python,django,redis,django-channels","A_Id":61819156,"CreationDate":"2020-05-15T11:45:00.000","Title":"Getting django error even after deleting mistake line","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"So, I recently started learning Django and found out about the two ways to create obejcts in database using their given API. Now, one of the methods is to use the create() methods that is provided by Manager class as follows :\njoe = Author.objects.create(name=\"joe\")\nNow, objects is the default manager given by Django but I could not find create() method inside the source code. Please tell me what am I missing?","AnswerCount":1,"Available Count":1,"Score":-0.1973753202,"is_accepted":false,"ViewCount":111,"Q_Id":61818472,"Users Score":-1,"Answer":"create(**kwargs) methods provided by QuerySet. That method allows you to create some object immediately and returning the created object itself. For the detail, you can find the create() method on the Django installation directory. Exactly in python-path\/site-packages\/django\/db\/models\/query.py","Q_Score":2,"Tags":"python,django,web,django-models","A_Id":61818803,"CreationDate":"2020-05-15T11:48:00.000","Title":"Is there a create() method in the Manager class of Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Context: I recently realized that YouTube has this new chapter thing feature, I listen to a lot of music mixes and such and those have the song name as chapters, and on linux I print the currently playing YouTube song anyway, so I tought that instead of displaying the name of the mix if I could display the song name in a mix using this new chapter feature.\nQuestion: My question would be, is there any way Python can communicate with a Chrome extension written in JS? Because I made this song name finding extension in JS, so only what it does is extract the name of the song with its Xpath then outputs it with console.log(X). I would need this output inside python where I could work with this given song name.\nUsing selenium and stuff like this, is not an option I think because those are completely separate from the browser","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":211,"Q_Id":61819396,"Users Score":0,"Answer":"You can either work on translating your Python code to JS and adding it to the extension, or running a web server built in Python that you can make requests to.","Q_Score":0,"Tags":"javascript,python,google-chrome","A_Id":61819420,"CreationDate":"2020-05-15T12:36:00.000","Title":"Is there a way that Python can communicate with a Chrome extension?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a request - can you help me access and manage django DB objects without using shell ?\nI have created my models, but now (for example) i want to make a login system. I store users and passes(again, only an example), and i want to get the info from the DB, but i dont want to use shell.\nWhat can i do in this case, im quite new to Django ?!\nBest Regards","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":75,"Q_Id":61819741,"Users Score":0,"Answer":"In views.py you can import\nfrom .models import modelname\ndata = modelname.objects.all() - using this you can get all the data from the Database\nEg:-\nfor d in data:\n           print (d.email)\nWill give all emails in the database\nYou can also use\nt = modelname.objects.get(email='name@lk.com')\nBy this you can get the data of the person who's email is name@lk.com","Q_Score":0,"Tags":"python,sql,django","A_Id":61819931,"CreationDate":"2020-05-15T12:54:00.000","Title":"Access Django DB objects without shell?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Using DynamoDB, I know I can specify a conditional expression to control updates, for example, using attribute_not_exists() to prevent overwriting an existing item. However, is there any way to check the result of this? I.e. if there was indeed an existing item and the create failed, I'd like to know that so I can return an error code in my HTTP response. However, looking at the documentation in Boto3, by default put_item returns nothing, so I'm unsure of how I'd be able to monitor the success of the operation. Anyone found a way to do this?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":225,"Q_Id":61825481,"Users Score":0,"Answer":"Found it, ConditionalCheckFailedException is thrown. Disappointed the docs don't mention this, other kinds of exceptions are detailed in the boto3 docs, but not this one!","Q_Score":1,"Tags":"python,amazon-web-services,amazon-dynamodb","A_Id":61825683,"CreationDate":"2020-05-15T17:54:00.000","Title":"DynamoDB Python API: Way to check result of conditional expression?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to programming and learned a little bit of Python in the previous two weeks and wrote an automation script that scrapes Categories and articles in each category from a website. Now I want to test that script on my WordPress blog and post articles in their respective categories in the WordPress blog. Can someone direct me to any thorough guide to executing this process? I have done some research on this but there is very little information available on the internet.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":55,"Q_Id":61846902,"Users Score":1,"Answer":"The best way is to write a php code (in your site) where you will upload the json file. the script will then save data to your database .Modify the  python script to save the scraped data in json(many languages easily support it + has more usage and is faster) then upload it to the php file.From database you can display your data","Q_Score":0,"Tags":"python,php,wordpress,web-scraping","A_Id":61847623,"CreationDate":"2020-05-17T04:14:00.000","Title":"Can I post Python scraped articles to my wordpress site using XML-RPC?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm running a server with Flask and gunicorn, using gevent workers. One of the endpoints in flask have to upload files to S3, which can take a lot of time. \nTo make the connection not being killed by gunicorn, I've increase the default timeout, which does not look as a nice implementation. \nIs there a way to communicate with gunicorn, while I send the S3 upload, to keep my worker alive?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":84,"Q_Id":61864277,"Users Score":0,"Answer":"In this situation, i recommand to use celery","Q_Score":0,"Tags":"python,http,flask,gunicorn,gevent","A_Id":61865273,"CreationDate":"2020-05-18T07:15:00.000","Title":"How avoid Gunicorn kill the flask connection","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Im new to Javascript so I would like to keep it at the bare minimum. Is there a way that I can use the Electron to communicate with python script without having node.js? My app is just a basic app that takes some input from users from a html page and I need this text input to be processed in python and write an excel file. So there is not much happening in html so is there a simple way to transfer the input to python file? I want to use Electron because I need this html to be my UI and also I need to distribute this app.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":1855,"Q_Id":61866120,"Users Score":1,"Answer":"Recently i have done it with some sort of trick hope it will help you and there are the following step which i followed- \n\nCreated a stand alone python exe using pyinstaller and the exe has flask server internally then i put the flask server inside my node application.\nNow we have to initiate our flask server and send a request to it for processing, i have done this with the help of \"execFile\" function as a child process, for which i have created a function and the code was something like that- \nasync function callFlask(){\n var child = require('child_process').execFile;\n child('path_to_python_exe ', function(err, data) {\n if(err){\n   console.error(err);\n   return;\n }\n });\n }\nNow we have initiated our flask server then will send the request with the help of fetch request like\nawait callFlask().then(\nawait fetch('host_ip_defined_in_flask'+encodeURIComponent('data'))\n\nNow further we can extend our then chain to get response from python if any and proceed further forexample - \n\nawait callFlask().then(\nawait fetch('host_ip_defined_in_flask'+encodeURIComponent('data'))\n.then(res => res.text())\n.then(body => console.log(body)))\n\nHere, your output data which python return will be printed in console then you can make your node application behave differently depending on output returned by it.\n\nAlso you can package your app with available packagers for electron like electron-packager it will work like a charm.\n\nAlso there is are some disadvantage for using python as like it will increase your package size and the process will be difficult to kill from electron after processing so it will increase burden on host machine.\nI am assuming that Explaining to create a flask server is not the scope of this question instead if you face any issues let me know, i hope it will help...","Q_Score":2,"Tags":"python,electron,electron-builder,electron-packager","A_Id":62085290,"CreationDate":"2020-05-18T09:08:00.000","Title":"Can I use Electron without node.js","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"previously we implemented one django application call it as \"x\" and it have own database and it have django default authentication system, now we need to create another related django application call it as \"y\", but y application did n't have database settings for y application authentication we should use x applications database and existing users in x application, so is it possible to implement like this?, if possible give the way how can we use same database for two separated django applications for authentication system.\nSorry for my english\nThanks for spending time for my query","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":186,"Q_Id":61866620,"Users Score":0,"Answer":"So, to achieve this. In your second application, add User model in the models.py and remember to keep managed=False in the User model's Meta class.\nInside your settings.py have the same DATABASES configuration as of your first application.\nBy doing this, you can achieve the User model related functionality with ease in your new application.","Q_Score":1,"Tags":"python,django,authentication","A_Id":61867227,"CreationDate":"2020-05-18T09:36:00.000","Title":"How two Django applications use same database for authentication","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"The real difference between MEDIA_ROOT and STATIC_ROOT in python django and how to use them correctly? \nI just was looking for the answer and i'm still confused about it, in the end of the day i got two different answers:\n- First is that the MEDIA_ROOT is for storing images and mp3 files maybe and the STATIC_ROOT for the css, js... and so on.\n-Second answer is that they were only using MEDIA_ROOT in the past for static files, and it caused some errors so eventually we are only using STATIC_ROOT.\nis one of them right if not be direct and simple please so everybody can understand and by how to use them correctly i mean what kind of files to put in them exactly","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":318,"Q_Id":61869169,"Users Score":0,"Answer":"Understanding the real difference between MEDIA_ROOT and STATIC_ROOT can be confusing sometimes as both of them are related to serving files.\nTo be clear about their differences, I could point out their uses and types of files they serve.\n\nSTATIC_ROOT, STATIC_URL and STATICFILES_DIRS are all used to serve the static files required for the website or application. Whereas, MEDIA_URL and MEDIA_ROOT are used to serve the media files uploaded by a user.\n\nAs you can see that the main difference lies between media and static files. So, let's differentiate them.\n\nStatic files are files like CSS, JS, JQuery, scss, and other images(PNG, JPG, SVG, etc. )etc. which are used in development, creation and rendering of your website or application. Whereas, media files are those files that are uploaded by the user while using the website.\n\nSo, if there is a JavaScript file named main.js which is used to give some functionalities like show popup on button click then it is a STATIC file. Similarly, images like website logo, or some static images displayed in the website that the user can't change by any action are also STATIC files. \nHence, files(as mentioned above) that are used during the development and rendering of the website are known as STATIC files and are served by STATIC_ROOT, STATIC_URL or STATICFILES_DIRS(during deployment) in Django.\nNow for the MEDIA files: any file that the user uploads, for example; a video, or image or excel file, etc. during the normal usage of the website or application are called MEDIA files in Django. \nMEDIA_ROOT and MEDIA_URL are used to point out the location of MEDIA files stored in your application.\nHope this makes you clear.","Q_Score":0,"Tags":"python,django,database,production-environment,django-staticfiles","A_Id":61869821,"CreationDate":"2020-05-18T12:02:00.000","Title":"The real difference between MEDIA_ROOT (media files) and STATIC_ROOT (static files) in python django and how to use them correctly","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am kind of scared of filling billing information on the Heroku website because of the automatic billing option in case I forget to remove an account.\nHelp me with your experience.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":681,"Q_Id":61872601,"Users Score":0,"Answer":"If you're still on free tier, it will not charge you. When I upgraded to hobby, I was only charged for how often the service was used (often less than $7). They were very honest - I have had no problems with Heroku. If you elaborate on your concerns, maybe I can provide a more tailored response.\nYou can stop charging at any time. If you're looking for specific information on how to remove your card\/billing information, thus reducing down to the free tier you can change your dyno type in \"Resources\" on the Heroku web app.","Q_Score":0,"Tags":"python,flask,heroku,web-hosting,billing","A_Id":61872665,"CreationDate":"2020-05-18T15:03:00.000","Title":"How to stop automatically Billing in Heroku website?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on a maven project that has its source file in JAVA. I had to add some functionality in the project through some already written code. But these new files were written in PYTHON. Hence I decided to make a shell script that can run both the java and python files with desired args. But since my java source files are in the maven project, I am not able to write a shell script without exploiting the structure of the maven project.\nSo, how can I run the above files without ruining the structure of my maven project?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":155,"Q_Id":61873458,"Users Score":0,"Answer":"As Andersen mentioned that Maven can compile and execute .java files, it means it is only specific to java. For python files, you need setup.py to build python based project. You can not directly call a function written in Python from Java class. Now coming back to your requirements, I can think that you have to build separately java project using Maven with the command mvn clean install and you have to run setup.py if available in python project. Since you cannot call a python function from java class, you have to create an exe file in python using pyinstaller or using py2exe and you invoke the exe file from java. The above I mentioned in one of the approaches. Another approach is to rewrite the python code in java and build using maven. This will be the good approach based upon the requirement. Besides, if you are interested to build java project using Maven and you want to build python project, you can write a .bat file.","Q_Score":0,"Tags":"java,python,shell,maven","A_Id":61873953,"CreationDate":"2020-05-18T15:41:00.000","Title":"Running a maven project and a python file through shell script","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm making a twitterbot for an honors project and have it almost completed. However, when I scrape the website for a specific URL, the href refers to a link that looks like this:\n?1dmy&urile=wcm%3apath%3a%2Fohio%2Bcontent%2Benglish%2Fcovid-19%2Fresources%2Fnews-releases-news-you-can-use%2Fnew-restartohio-opening-dates\nWhen inspecting the html and hovering over the href contents above, it shows that the above is actually the tail-end of the link. Is there any way to take this data and make it into a usable link? Other links within the same carousal provide full links on the same website, so I'm not sure why this is different than the others.\nI tried searching for answers to this question but came up short: sorry if this is a repeat.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":28,"Q_Id":61876033,"Users Score":0,"Answer":"BeautifulSoup is showing you what the HTML of the page has. If the link is relative, you need the base URL for the page. That should come back in your request result, not in the HTML itself.","Q_Score":0,"Tags":"python,web-scraping,twitter,beautifulsoup,href","A_Id":61876137,"CreationDate":"2020-05-18T18:02:00.000","Title":"Beautifulsoup4: How do you extract a usable link from href when it only provides parameters","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In a django project I have imported firebase_admin and it worked perfectly on local host, but when I used Heroku to host my web app it gave error no module named 'firbase-admin'. I cross-checked my requirements files and it has firbase-admin. I don't know what's that I did wrong as I made sure that requirements used in virtual environment is same to that in Heroku requirements files.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":138,"Q_Id":61876080,"Users Score":0,"Answer":"make sure firebase-admin==4.3.0 is in your requirements.txt file and try not to generate dependencies manually because you can missout on some libraries preferably use pip freeze > requirements.txt","Q_Score":0,"Tags":"python,django,firebase,heroku","A_Id":62207057,"CreationDate":"2020-05-18T18:05:00.000","Title":"Integrating Python Heroku with Firebase","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm learning django and following a tutorial, the thing is that when I try to import a function in the file urls.py from views.py and when I run the server the cmd throws the error no module named \"views\", and the guy in the tutorial doesn\u00b4t get that error and doesn\u00b4t talk anything about it.\n(They\u00b4re in the same directory, I tried importing the function to the module __init__, but throws the exact same error","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":69,"Q_Id":61878241,"Users Score":0,"Answer":"Have u added ur application to INSTALLED_APPS?","Q_Score":0,"Tags":"python,django,function,cmd,import","A_Id":61880271,"CreationDate":"2020-05-18T20:17:00.000","Title":"From file import function (django)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I made a simple Flask app that has no sort of auth since it doesn't really require it. Today my database reached 100,000 users when it normally gets about 5 in a day. I looked at my analytics but saw no one has been on the site in the past hour. \nHow are they creating this many users so fast and how can I prevent it? I had to take my database offline since it's been happening all day.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":36,"Q_Id":61879904,"Users Score":0,"Answer":"this is probably just a bot or your site really work, but in case what you can do is, do authentication of email, set up an SMTP server and send some code\/numbers\/link to the registered emails and once verified then add them in a database or just set a  certain time for email authentication and if time passed then deletes the data\/record for that email\/user login credential.\nor \nyou can record the ip from which it is registered, and see if all the emails are registered form that ip, the block it if too many ( just a filter)","Q_Score":0,"Tags":"python,flask","A_Id":61880131,"CreationDate":"2020-05-18T22:14:00.000","Title":"Preventing someone from creating thousands of users","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I made a simple Flask app that has no sort of auth since it doesn't really require it. Today my database reached 100,000 users when it normally gets about 5 in a day. I looked at my analytics but saw no one has been on the site in the past hour. \nHow are they creating this many users so fast and how can I prevent it? I had to take my database offline since it's been happening all day.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":36,"Q_Id":61879904,"Users Score":0,"Answer":"How are they creating this many users so fast and how can I prevent it?\nYou should think about:\n\nAccount activation with email\nOr prevent too many api cals from one ip to your register route (maybe someone is just destroying your app with bot)","Q_Score":0,"Tags":"python,flask","A_Id":61880005,"CreationDate":"2020-05-18T22:14:00.000","Title":"Preventing someone from creating thousands of users","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We have a small website with API connected using AJAX.\nWe do not ask for usernames and passwords or any authentication like firebase auth.\nSo it's like open service and we want to avoid the service to be misused.\nOAuth 2 is really effective when we ask for credentials to the user.\nCan you suggest the security best practice and how it can be implemented in this context using python?\nThanks","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":63,"Q_Id":61883103,"Users Score":1,"Answer":"Use a firewall\nAllow for third-party identity providers if possible\n Separate the concept of user identity and user account","Q_Score":0,"Tags":"python,api,security,certificate,backend","A_Id":61883428,"CreationDate":"2020-05-19T04:10:00.000","Title":"Python backend -Securing REST APIs With Client Certificates","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"kpi_data_cnt = TKPI_DETAIL_RECORD.objects.raw('SELECT COUNT(*) FROM first_app_TKPI_DETAIL_RECORD where MONTH_KEY = \"202005\"')\nprint(kpi_data_cnt)\nI want to populate the total row count from the table first_app_TKPI_DETAIL_RECORD and store in the variable \"kpi_data_cnt\". But it is not working using the above code. I also put a display in my code to check the value of the variable \"kpi_data_cnt\". There is in the display, it is showing the total select query instead of providing me the row counts.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":22,"Q_Id":61883194,"Users Score":1,"Answer":"Try this\nkpi_data_cnt=TKPI_DETAIL_RECORD.objects.filter(MONTH_KEY = \"202005\"').count()","Q_Score":0,"Tags":"python,sqlite,django-models","A_Id":61883346,"CreationDate":"2020-05-19T04:20:00.000","Title":"SQL Lite total row count fetching not working with Django Models","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created a Django project in vscode. Generally, vscode automatically prompts me to install pylint but this time it did not (or i missed it). Even though everything is running smoothly, I am still shown import errors. How do I manually install pytlint for this project?\nAlso,in vscode i never really create a 'workspace'. I just create and open folders and that works just fine.\nps. Im using pipenv. dont know how much necessary that info was.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":315,"Q_Id":61892803,"Users Score":1,"Answer":"Hi you must active your venv at the first then install pylint (pip install pylint)\nIn vscode: ctrl+shift+P then type linter (choose \"python:select linter\") now you can choose your linter (pylint)\nI hope it helps you","Q_Score":0,"Tags":"python,django,visual-studio-code,pylint","A_Id":61899590,"CreationDate":"2020-05-19T13:54:00.000","Title":"How to add pylint for Django in vscode manually?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a HTML code having a div tag with class=\"some_class\". And there is a p tag inside this div tag:\n<div class=\"some_class\">\n<p>blah blah blah...<\/p>\n<\/div>\nI need to get the p tag's content and store it in a variable.\nI did it in two steps:\n1)Get the div tag using findAll('div', class_='some_class'),\n2)Using split at the p tag\nIs there any direct way of doing this without having to do the complex splitting?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":1001,"Q_Id":61894438,"Users Score":1,"Answer":"If you have only one div tag and only one p tag in it, you can do this:\ncontent = soup.findAll('div', class_= 'some_class')[0].findAll('p')[0].contents[0]","Q_Score":2,"Tags":"python,html,web-scraping,beautifulsoup","A_Id":61895043,"CreationDate":"2020-05-19T15:11:00.000","Title":"Getting the content of a  tag inside a  class=\"some_class\"> tag using Beautiful Soup in Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've recently been working on a little project and I want to host it on the cloud so it can run all the time, rather than constantly on my local machine.  However I'm kind of stumped when it comes to choosing a hosting solution, and I was wondering if you guys could give me some advice.\nSome details about the project:\n\nIt's a Python script, not a web app, and should be running constantly (actions are scheduled once per day)\nIt uses a few fairly large external dependencies, namely Selenium and Chromedriver, which requires binaries to be installed on the machine and grabbable (not sure if that's a word) by path from the script\nIt uses a few static files (mp3) as assets, which need to be stored on a file system somehow and grabbed by the script\nIt writes video files to the local filesystem\n\nDo you guys have any recommendations for hosting solutions which satisfy these details? I've tried with Heroku, which satisfies details 1-2, but since Heroku has like a weird \"ephemeral file system\" I can't grab the static files nor write video files to the file system.  \nThanks for the help!","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":151,"Q_Id":61899261,"Users Score":1,"Answer":"I suggest you to look at AWS (since is the only platform I've been working with).\nWith it's free acount you can use an EC2, where you can store your script and dependencies, and your output can be written in an S3 instance (free for 30GB if I remeber well).\nAs you are going to use Selenium, you will need a GUI for your system, so your choices are a Windows machine for EC2 or Linux (does not came with a graphical environment by default). It is not difficult to install a GUI on Linux machines and configure to acces by RDP, but I suggest to use instead a simulated graphical environment such as XVFB. I used it and is as simple as launching your script with xvfb run first. That way you are saving some processor load for your machine.\nI hope it helps,\nRegards.","Q_Score":1,"Tags":"python,selenium,filesystems,hosting","A_Id":61899537,"CreationDate":"2020-05-19T19:32:00.000","Title":"How to host selenium Python script with file system access?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"If I develop a REST service hosted in Apache and a Python plugin which services GET, PUT, DELETE, PATCH; and this service is consumed by an Angular client (or other REST interacting browser technology).  Then how do I make it scale-able with RabbitMQ (AMQP)?  \nPotential Solution #1\n\nMultiple Apache's still faces off against the browser's HTTP calls.\nEach Apache instance uses an AMQP plugin and then posts message to a queue\nPython microservices monitor a queue and pull a message, service it and return response\nResponse passed back to Apache plugin, in turn Apache generates the HTTP response \n\nDoes this mean the Python microservice no longer has any HTTP server code at all.  This will change that component a lot.  Perhaps best to decide upfront if you want to use this pattern as it seems it would be a task to rip out any HTTP server code.\nOther potential solutions?  I am genuinely puzzled as to how we're supposed to take a classic REST server component and upgrade it to be scale-able with RabbitMQ\/AMQP with minimal disruption.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":241,"Q_Id":61900319,"Users Score":2,"Answer":"I would recommend switching wsgi to asgi(nginx can help here), Im not sure why you think rabbitmq is the solution to your problem, as nothing you described seems like that would be solved by using this method.\nasgi is not supported by apache as far as I know, but it allows the server to go do work, and while its working it can continue to service new requests that come in. (gross over simplification)\nIf for whatever reason you really want to use job workers (rabbitmq, etc) then I would suggest returning to the user a \"token\" (really just the job_id) and then they can call with that token, and it will report back either the current job status or the result","Q_Score":0,"Tags":"python,rabbitmq,amqp","A_Id":61900432,"CreationDate":"2020-05-19T20:36:00.000","Title":"How to interpose RabbitMQ between REST client and (Python) REST server?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I built my Django project on my local PC and then I 'uploaded' all the files to GitHub. For using PythonAnywhere as a clone to GitHub, I thought all the files wouldn't be transfered to PythonAnywhere server, but for my surprise they all gone there.\nIn this way, I have now 3 different locals to get my files stored: local PC, GitHub and PythonAnywhere.\nWhen I make changes in my code (PC), I'll have to commit to GitHub and then update to PythonAnywhere?\nIs that all right or I'm missing something?\nThank you!","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":65,"Q_Id":61904399,"Users Score":1,"Answer":"commit on your local machine\npush to github\npull on PythonAnywhere\nrun .\/manage.py migrate if needed\nreload your web app on PythonAnmywhere \"web\" page","Q_Score":0,"Tags":"python,django,github","A_Id":61910682,"CreationDate":"2020-05-20T03:09:00.000","Title":"Deploy PythonAnywhere","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"My login forms are working properly but are not connected to the html button. The page with this button is on another url different from the accounts page. How do i link it with the app for accounts or folder containing my html forms. Is there a way of inheriting the app folder into this main folder or inporting just to have a link.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":36,"Q_Id":61912608,"Users Score":1,"Answer":"in link just used {% url 'app_name:name' %}\nhere app_name = in urls.py file\nand name is path name.","Q_Score":0,"Tags":"python,html,css,django,forms","A_Id":61914185,"CreationDate":"2020-05-20T12:01:00.000","Title":"Link html buttons to user registration form","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working my way to deploy my django app on a Linux Server. Encountered with various problems and want someone to clarify that for me. I searched for days but the answer I found are either too broad or faded away from topic.\n1) According to django docs, it is inefficient to serve static files locally. Does that means that all the static files including html,css,js files should be hosted on another server?\n2) I have an AWS S3 bucket hosting all my media files, can I use that same bucket (or create a new bucket) to host my static files if above answer is yes. If so, is that efficient?\n3) According to search, in order for django to scale horizontally, it should be a stateless app, does it means that I also have to host my database on a different location than my own Linux server ?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":364,"Q_Id":61921135,"Users Score":1,"Answer":"1) It is completely fine to host your staticfiles on the same server as your django application however to serve said files you should use a web server such as NGINX or Apache. Django was not designed to serve static data in a production environment. Nginx and Apache on the other hand do great job at it.\n2) You can definitely host your static and media files inside an S3 bucket. This will scale a lot better than hosting them on a single server as they're provided by a separate entity, meaning that no matter how many application servers you're running behind a load balancer, all of them will be requesting staticfiles from the same source. To make it more efficient you can even configure AWS' CloudFront which is Amazons CDN (content delivery network).\n3) Ideally your database should be hosted on a separate server. Databases are heavy on resources therefore hosting your database on the same server as your application may lead to slowdowns and sometimes outright crashes. Scaling horizontally, you'd be connecting a lot of application servers to a single database instance; effectively increasing the load on that server.\nAll of the points above are relative to your use case and resources. If the application you are running doesn't deal with heavy traffic - say a few hundred hits a day - and your server has an adequate amount of resources (RAM, CPU, storage) it's acceptable to run everything off a single box.\nHowever if you're planning to accept tens of thousands of connections every day it's better to separate the responsibilities for optimum scalability. Not only it makes your application more efficient and responsive but it also makes your life easier in the long run when you need to scale further (database clustering, nearline content delivery, etc).\nTL;DR: you can run everything off a single server if it's beefy enough but in the long run it'll make your life harder.","Q_Score":1,"Tags":"python,django,django-deployment","A_Id":61921830,"CreationDate":"2020-05-20T19:15:00.000","Title":"Deployment of django app - Scaling, Static Files, Servers","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Attempting to use GCP Authorized Session get method in Python to query data in GCP.  The doc shows:\nget(url, **kwargs)\nSends a GET request. Returns Response object.\nParameters: \nurl \u2013 URL for the new Request object.\n**kwargs \u2013 Optional arguments that request takes.\nReturn type:\nrequests.Response\nI set up a kwarg dict as kwargs = {'page_size': 2000'}\nHowever, when I passed it to the call authsess.get('someurl', kwargs), I get the following error...\nTypeError: get() takes 2 positional arguments but 3 were given.\nIt works fine using just the url, but, I will need to add parms (specifically a nextPageToken as if one is returned)\nCan someone please give me a little guidance on what I am missing here?  Do I need to encode the url and parms together? or?  I have tried various options here, but, just can't get it to work and not sure yet just 'how' to interpret\/implement what I find in the doc for making http requests...\nThanks in advance.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":131,"Q_Id":61924362,"Users Score":1,"Answer":"OK, sorry if I wasted anyone's time.  The answer is that I needed to add 'params=' to the beginning of the parameters string...  i.e., authsess.get('someurl', params=kwargs)\nReally wish that had been mentioned in the doc....","Q_Score":0,"Tags":"python,google-cloud-platform,parameters,get,request","A_Id":61925609,"CreationDate":"2020-05-20T22:59:00.000","Title":"GCP authorized session get method using python 3","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have installed superset in python virtual env on GCP VM. I am running the superset using following command inside the virutal env.\ngunicorn -w 5 --timeout 120 -b 0.0.0.0:8088 \"superset.app:create_app()\"\nBut when i  terminate my SSH connection the server stops, How to run SupserSet forever irrespective of my SSH connection.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":532,"Q_Id":61928369,"Users Score":0,"Answer":"you can usually run commands as a daemon using:\nnohup <your command> &","Q_Score":1,"Tags":"python","A_Id":61928991,"CreationDate":"2020-05-21T06:13:00.000","Title":"Run the Server in the background","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a OnetoOne field  with primary_key=True in a model.\nNow I want to change that to a ForeignKey but cannot since there is no 'id'.\nFrom this:\n\nuser = models.OneToOneField(User, primary_key=True, on_delete=models.CASCADE)\n\nTo this:\n\nuser1 = models.ForeignKey(User, related_name='questionnaire', on_delete=models.CASCADE)\n\nShowing this while makemigrations:\n\nYou are trying to add a non-nullable field 'id' to historicaluserquestionnaire without a default; we can't do that (the database needs something to populate existing rows).\n  Please select a fix:\n   1) Provide a one-off default now (will be set on all existing rows with a null value for this column)\n   2) Quit, and let me add a default in models.py\n\nSo how to do that?\nThanks!","AnswerCount":3,"Available Count":1,"Score":0.0665680765,"is_accepted":false,"ViewCount":640,"Q_Id":61930115,"Users Score":1,"Answer":"The problem is that your trying to remove the primary key, but Django is then going to add a new primary key called \"id\".  This is non-nullable and unique, so you can't really provide a one-off default.\nThe easiest solution is to just create a new model and copy your table over in a SQL migration, using the old user_id to populate the id field.  Be sure to reset your table sequence to avoid collisions.","Q_Score":0,"Tags":"python,django,django-models","A_Id":69903289,"CreationDate":"2020-05-21T08:14:00.000","Title":"OnetoOne (primary_key=Tue) to ForeignKey in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"i'm using odoo 10, python version 2.7 and pycharm 2019.3.2\ni set script path to odoo-bin, python interpreter to python.exe (2.7), environnement variables to PYTHONUNBUFFERED=1, everything works fine.\nNOW, i wanna work with odoo 13 in the same time, i've python version 3.7 and pycharm 2019.3.2\ni set script path to odoo-bin (odoo 13), python interpreter to python3.exe, environnment variables to PYTHONUNBUFFERED=1,  here when i'm getting this error in the log when i run odoo:\nProcess finished with exit code -1073740940 (0xC0000374) \ni don't know why i'm having this? can anyone help me plz!","AnswerCount":1,"Available Count":1,"Score":0.6640367703,"is_accepted":false,"ViewCount":5028,"Q_Id":61935980,"Users Score":4,"Answer":"after many research i found the solution: it's not a problem of odoo or pycharm, it's a windows 10 problem!.\nGo to panel control > Region > Administrative, and on Languages for non-unicode programs, change regional configuration, check 'Use UTF-8 to language support worldwide' then restart the computer.","Q_Score":3,"Tags":"python,odoo","A_Id":61937729,"CreationDate":"2020-05-21T13:47:00.000","Title":"Process finished with exit code -1073740940 (0xC0000374)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"How can I refresh my python file in every five minutes in django while running because every hour the data I'm webscraping is changing and I need to change the value of the variable?","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":297,"Q_Id":61936282,"Users Score":0,"Answer":"I recommend using database like sqlite3 is better solution than restart django(web service) per hours.\nYou can store some datas in database and django can get them like using variables.","Q_Score":1,"Tags":"python,django","A_Id":61936725,"CreationDate":"2020-05-21T14:01:00.000","Title":"How can I refresh every five minutes my Python File in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How can I refresh my python file in every five minutes in django while running because every hour the data I'm webscraping is changing and I need to change the value of the variable?","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":297,"Q_Id":61936282,"Users Score":0,"Answer":"The real problem here is that you're fetching the data at the start of the application and keeping it in memory. I see 2 possible better methods:\n\nmove the data scraping code to your view function. This means you'll re-scrape on every call ensuring you'll always have the freshest data but at the cost of speed (the time it takes to make the request to your target url).\nbetter yet: same as above except you cache the results locally. This could also be kept in memory (although I'd use a file or database if you're running multiple django app instances to ensure they're all using the same data). With the least amount of change to what you have already, an in memory cache could be achieved with simply adding a timestamp variable that gets the current time on each fetch. If last fetch was more than X minutes ago: refetch your data.","Q_Score":1,"Tags":"python,django","A_Id":61936962,"CreationDate":"2020-05-21T14:01:00.000","Title":"How can I refresh every five minutes my Python File in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am fairly new to Django and need some guidance\nI am looking for something in Django that allows me to run background tasks while my website continues to work, and probably I can check for the status of the task.\nSo basically I am working on a recon engine. This engine will run other python scripts and displays the results in a nice and fancy way. The python scripts and other tools have been already developed by other people. My website's job is to run those python & shell scripts and save the result back to the database. These tools will take a considerable amount of time to gather the result.\nSo, what is the best approach for this? I looked for celery and Django Q, looks like it's an overkill for my small task. There's a lot of setup for Celery and Django, though I am open to learning new things, for a simple task to run something in the background, I don't wish to use something that is really complex. \nCan you all please suggest what could be a better approach for doing something in background, and once the task is done, probably notify back to the Django and gather the result, or when task is running, I have an option to check the task's status, finished, killed or still running.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":235,"Q_Id":61937055,"Users Score":1,"Answer":"Celery is, afaik, the most common method to achieve this in the django ecosystem. A simpler and more hacky method would be to use the multiprocessing module to spawn off background tasks. This can work fine if the workload is confined to a single machine. As soon as you need a second machine you'll be back to looking at task\/job queues and distributed flows :)","Q_Score":0,"Tags":"python,django,asynchronous,django-rest-framework","A_Id":61937769,"CreationDate":"2020-05-21T14:41:00.000","Title":"Better approach for running background python script in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have to set up a ssh connection using python. I am using the pexpect module to which I need to pass user credentials.\nI keep my code in a Git repo. How can I handle the password?\nShould I - \n\nEncode it with baseurl64 or\nKeep it in the Jenkins password manager?\n\nWhat are the best standards you follow?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":70,"Q_Id":61944947,"Users Score":3,"Answer":"You should not store secrets unencrypted in a Git repository.  Anyone who obtains a copy of that repository can get access to those secrets.  Even if the repository is private, sometimes unauthorized users get access to repositories, and you definitely want to limit the possible damage.\nBase64-encoding secrets does not hide them, so you should not use that option.  The best way to set up an SSH connection would be to generate a key without a passphrase and store it in your CI secret store, and then in your CI job saving it to a temporary file and using it with ssh -i.\nIf that's not possible, you can use a password with your pyexpect option and store that in your CI secret store.","Q_Score":1,"Tags":"python,python-3.x,git,python-2.7,github","A_Id":61945057,"CreationDate":"2020-05-21T22:38:00.000","Title":"How to handle application password in Git repo","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"As a Python3 newbie, I made use of venv to create a project, and the created project directory structure is like this:\n\nbin\ninclude\nlib\nlib64 (link to lib)\npenv.cfg\nshare\n\nThe next step is to store this project into a version control system like git. As a Java programmer working on maven project, storing pom.xml to version control is enough. So I feel a bit unworthy to store all these subdirectories to the version control\nQuestion: Should I store all these files into the Version Control? If not, which of them to store in version control?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":201,"Q_Id":61971594,"Users Score":1,"Answer":"To store them in .git is unnecessary, if someone wants to have the same environment as you for example, you just want to make sure that they get the same requirements.txt file (packages that were installed by Python packet manager pip) \nThe bottom line is that to throw virtual environment in the gitignore and just have requirements file which is generated by pip freeze >> requirements.txt (you can name whatever you want but it is a convention to name it requirements","Q_Score":0,"Tags":"python,python-3.x,version-control,python-venv","A_Id":61971673,"CreationDate":"2020-05-23T11:53:00.000","Title":"How to maintain a Python project made with venv in version control","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"So I recently finished my python project, grabbing values from an API and put it into my website.\nNow I have no clue how I actually start the website (finding a host) and making it accessible to other people, I thought turning to here might find the solution.\nI have done a good amount of research, tried \"pythonanywhere\" and \"google app engine\" but seem to not really find a solution. \nI was hoping to be able to use \"hostinger\" as a host, as they have a good price and a good host. Contacted them but they said that they couldn't, though I could upload it to a VPS (which they have). Would it work for me to upload my files to this VPS and therefor get it to a website? or should I use another host?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":83,"Q_Id":61975190,"Users Score":0,"Answer":"A VPS would work, but you'll need to understand basic linux server admin to get things setup properly.\nSounds like you don't have any experience with server admin, so something like App Engine would be great for you. There are a ton of tutorials on the internet for deploying flask to GAE.","Q_Score":0,"Tags":"python,web,flask,hosting","A_Id":62033529,"CreationDate":"2020-05-23T16:28:00.000","Title":"Deploy python flask project into a website","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm creating a admin form where users can upload files. I want this to be stored in a secure place where the public can't get it. I'm using a standard form with a FileField and no model. Is there a way I can store the files in a folder within the app folder?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":136,"Q_Id":61983925,"Users Score":1,"Answer":"Yes you can do that by specifying the path in your settings.py file eg.  MEDIA_ROOT = os.path.join(BASE_DIR, 'media')\nMEDIA_URL = '\/media\/'","Q_Score":0,"Tags":"python,django,admin","A_Id":61984086,"CreationDate":"2020-05-24T09:19:00.000","Title":"Upload file django admin","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to develope a python cgi script for a server run on Windows+IIS. The cgi script is run from a web page with Windows authentification. It means the script is run under different users from Windows active directory. \nI need to use login\/passwords in the script and see no idea how to store the passwords securely, because keyring stores data for a certain user only. Is there a way how to access password data from keyring for all active OS users?\nI also tried to use os.environ variables, but they are stored for one web session only.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":138,"Q_Id":62005012,"Users Score":1,"Answer":"The only thing I can think of here is to run your script as a service account (generic AD account that is used just for this service) instead of using windows authentication. Then you can log into the server as that service account and setup the Microsoft Credential Manager credentials that way.","Q_Score":0,"Tags":"python,environment-variables,python-keyring","A_Id":63603194,"CreationDate":"2020-05-25T14:54:00.000","Title":"Secure password store for Python CGI (Windows+IIS+Windows authentification)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have been using Puppeteer to log into a bank website and scrape data of my transactions in a C# application, and it works fine.\nHowever, I am looking for a way to do the same in a simple Azure function.  I was able to get it working by wrapping it in a docker instance, but the expense of the Azure Premium Subscription in order to run it makes it not cost-effective.\nI have looked at trying to log into logging into the site and scraping the HTML, except it uses CryptoJS to alter the login credentials, as well as create some unique form properties on the POST message.  \nSo my question is, is it possible to pull out the JS from the website to replicate the encoding with python, so I don't require a full headless browser to log in?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":61,"Q_Id":62014689,"Users Score":0,"Answer":"After further investigation, the site itself is a Javascript Renderable site, which requires requests-html to render, which in itself uses pyppeteer which is a headless chromium, which won't work in Azure anyway.  \nSo I'm just going to look at alternative hosting and build it as a web API instead of Azure Functions.","Q_Score":0,"Tags":"python-3.x,azure,cryptojs","A_Id":62032684,"CreationDate":"2020-05-26T04:29:00.000","Title":"Unable to log into encrypted Banking website with Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've been learning HTML and CSS for about a year, I\u2019m a massive noob at Python and I would like someone to clear some things up for me if possible.\nI'm wanting to use a browser extension to automate some work tasks, there's a few good ones that work with JS but I'd like to focus on Python.\nI understand that python would require a interpreter to work, I've ran some basic scripts on my PC but I don't understand how you'd execute scrips externally on the web.\nDo web browsers have a built in interpreter?\nAre there such extensions that exist?\nAnd if so do they have interpreters built in?\nPython is a brand new concept to me and I apologise if this is a stupid question. I aim to get the basics down first and then pick up a Raspberry Pi for some project work.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":43,"Q_Id":62023510,"Users Score":1,"Answer":"Do web browsers have a built in interpreter?\n\nThey have a JavaScript console in dev tools instead of python","Q_Score":0,"Tags":"python,web,browser,automation,scripting","A_Id":68939635,"CreationDate":"2020-05-26T13:42:00.000","Title":"Noob Question About Python Web Automation","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to webscraping, and I am unsure what is the most efficient way of going about this problem. This project is mostly in Python, but I am open to using other languages for the sake of efficiency.\nImagine some js driven value on a website, something like a real-time visitor count, or the price of some financial asset. that after the website is loaded, constantly updates as new information comes in. What I want is to sub-second sample one such value, but naturally, I don't want to bombard the server with requests, which would ruin accuracy anyway.\nI was thinking of something along the lines of loading a webpage with selenium, or the PyQt webkit, and then running a simple loop that monitors the value and updates a database as changes occur. I am not looking for code, that I can figure out on my own, but I'm unsure if that's the right way to go about solving this problem, or if there are more efficient ways.\nThank you","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":313,"Q_Id":62030579,"Users Score":0,"Answer":"I have done exactly what you are referring to by using Python and Selenium exclusively. I don't see why Python would not be the language to use for your specific use case. The only issue I could see would be if the webpage is constantly (or slowly) changing. \nI came across an issue where the webpage was redesigned and it through off my Xpath. All I had to do was correct the Xpath to reflect the new location and it still worked.\nAnother solution could be to check if their is already an existing API for the webpage you are trying to scrape. If this is the case, you may not have to do any web-scraping, and could just call the API and get your value. This would be the most efficient way, but obviously not possible if there is not API to call.\nSide-Note: I am most comfortable with Python and usually default to it when trying to automate a task. There may be more performant languages to use, but my choice would be Python.","Q_Score":1,"Tags":"javascript,python,web-scraping","A_Id":62030866,"CreationDate":"2020-05-26T20:09:00.000","Title":"How do I monitor a constantly updating value on a website?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a dataframe with a single column \"Cntr_Number\" with x no of rows.\nWhat i trying to achieve is using selenium to copy and paste the data into the web page textarea.\nThe constraint is that the web page text area only accept 20 rows of data per submission.\nSo how can i impplment it using while loop or other method.\n\nCopy and paste the first 20 rows of data and click on the \"Submit\"\nbutton \nCopy and paste the next 20 rows of data and click on the\n\"Submit\" button\n\nrepeat the cycle until the last row.\nSorry i dont have any sample code to show but this is what I'm trying to achieve.\nAppreciate if could have some sample code on how to do the implmentation.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":93,"Q_Id":62042753,"Users Score":1,"Answer":"The better approach will be capture all the the data in a List, Later while pasting it you can check the length of the list, and later iterate through the list and paste the data 20 at a time in the text area. I hope this will solve your problem.","Q_Score":0,"Tags":"python-3.x,pandas,selenium,rpa","A_Id":62043005,"CreationDate":"2020-05-27T12:06:00.000","Title":"How to copy and paste dataframe rows into a web page textarea field","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I writing an application that has a change control workflow.  Users retrieve data for a particular month and then they make edits to it and there is a review phase where they can approve records.  There are 2 identical tables a master and a staging table.  When the user loads up the application they load data from the master table and can edit it in a crud grid.  When they hit the stage button I want that data to get pushed inserted into the staging table.  How do i tell my view to do that.  The staging table doesnt have the associated records yet, i want the records that are sent back as part of the push  to get inserted there rather than doing an update to the master table?\nAny advice would be greatly appreciated.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":134,"Q_Id":62043101,"Users Score":0,"Answer":"You can add new field name can be status in your master table which shows this record in staging process. \nFor example : \nYou inserted new record into master table so initial value of status will be 1 (new_created). \nWhen you want to process Master table record you must change the status to 2 (in_staging) which is showing thia record in already in staging process can't process further. \nUsing new field can manage your process easily and you can check how many records are in staging process at a given time.\nWhen you store the master record you can check which fields are changed or not in form. \nSave master record with status 2 and copy the master record and save them into staging table. \nAfter that when your staging completed you can use the same process to save your objects.","Q_Score":0,"Tags":"django,python-3.x,django-models,django-rest-framework,django-views","A_Id":62056357,"CreationDate":"2020-05-27T12:25:00.000","Title":"Push changes to data in one Django model to another","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I would like to make a web application where a user can:\n\nclick a button on a webpage to create a **random video (with moviepy)\nplay that video back on the webpage\nclick the button again to create a new **random video that replaces the existing one\n\n** The random video will be created with a python\/moviepy script that downloads a bunch of random video clips from the internet to a directory on my computer. It then compiles them into one video (.mp4 file). \nI've done the python script bit already which successfully creates the video file. \nTo make the web app bit I have been recommended django and that's where I'm stuck! \nSo far I have installed django and got to grips with the basics .. I have a home page that says \"Hello world\". \nMy question is where do I go from here? \nHow do I connect my python\/moviepy script with django?\nWhat steps, apps, components etc, within django should I look into to make this thing?\nI'm new to coding and looking for some guidance. \nThanks!","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":465,"Q_Id":62043703,"Users Score":0,"Answer":"As I see, Django is for complex sites, you should look for Flask instead.\n(I am learning Django and I know nothing about Flask, so I`ll go with it)\nHere is the needed setup:\n\ndefine the urlpatterns for handling the URLs\ncreate a model for storing your video\ncreate a django template for your page (html)\ndefine a view for rendering out the template (passing the video)\nmaybe some css to design it\n\nYou can run your video generator(in the view) at every reload and override existing video(in this case you don't even need a model) or you can save the generated videos and capture the IDs in the URLs (for example: https:\/\/yoursite.com\/1), in this case, the videos remain shareable.\nIf you go with the first option and sharing videos is not important for you then you could write a simple html page with a video and a button. The button can trigger a javascript function to run the video generator python script and refresh the page(the video is overridden), you may need to wait to the script otherwise the old video can load.\nRestful API is a more advanced way to refresh the video, without reloading the page.\nAfter these, you can deploy your page using an Apache server for example.\nI tried to give you some guidelines (I am learning this on my own)\nHope that it helped :) There are tutorials for these.","Q_Score":0,"Tags":"python,django,moviepy","A_Id":62048184,"CreationDate":"2020-05-27T12:58:00.000","Title":"Creating a web app in django that creates a video (with moviepy) and plays it: Where to start?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I recently uploaded my Django App to the server (Digital Ocean). The functionality is okay as in my local project on my computer, but the design (css style) of the Admin Interface has changed drastically in a lot of elements of the change_list and change_form templates. I\u2018ve checked and made sure that the templates of my local Django and Suit files are the same as they of the server, but it is still not the same design. \nDoes anyone has experience with that?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":48,"Q_Id":62049475,"Users Score":1,"Answer":"In deployment server just collect your static files from static folder by running command python manage.py collectstatic which will create a staticfiles folder in your Main project app in the project directory. May be this will help. Try it out.","Q_Score":0,"Tags":"python,css,django","A_Id":62049550,"CreationDate":"2020-05-27T17:40:00.000","Title":"Python Django App Design change on deploy to server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a little flask webserver with just one route. The connection is kept open and streams data to the client for as long as the client doesn't stop the connection. \nI'm using waitress multiple threads, so it doesn't block.\nNow the problem. After some time, the CPU usage goes up to 100%. In the meantime in got some weird requests to \/admin.php, but they are all getting a 404. On idle or with a few connections I don't even see python3 under $ top. \nWhy is that and what can I do?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":738,"Q_Id":62061456,"Users Score":0,"Answer":"100% usage is for 1 core of CPU as you are using Flask and waitress ( GIL issue) -- Single processing multi threading , and your process seems to be primarily non CPU based like high IO , as a result  you do not see the python process using the CPU but the queue is increasing and after substantial queue , while allocating the CPU , it starts doing a context switching of all the queued threads and reaches a deadlock race condition . I had a similar problem where I moved out to Gunicorn kind of wsgi server which is capable of running it on multiprocessor with the workers and worker classes","Q_Score":0,"Tags":"python,flask,waitress","A_Id":64219770,"CreationDate":"2020-05-28T09:35:00.000","Title":"Flask \/ Waitress server randomly going to 100% CPU usage after time","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm learning Django and have I problem, I don't even know what I should search for to solve it. So maybe someone knows what I need.\nSo far I have two models in my project\n\nCustomUserModel with additional data\n\nRunningTrackModel which provides information about tracks like distance, location, etc.\n\n\nMy goal is now to save user specific Data for each object of the RunnningTrackModel like time, date, etc.\nWhenever a new RunningTrackObject is created, all users should get the possibility to sign up and save data to tracks they signed up for, but whats the right way to implement this?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":26,"Q_Id":62064069,"Users Score":0,"Answer":"save each object into an individual table in a relational database like MySQL\nlink them using the user ID as a foreign key.","Q_Score":0,"Tags":"python,django","A_Id":62064415,"CreationDate":"2020-05-28T11:54:00.000","Title":"How to save data related to two models","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How can I make a flask session work across multiple instances of containers using Kubernetes? Or does Kubernetes always maintain the same container for a given session?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":162,"Q_Id":62070868,"Users Score":1,"Answer":"Default Flask sessions are stored client-side (in the browser) as a cookie and cryptographically signed to prevent tampering. Every request to your Flask application is accompanied by this cookie. Therefore, if all running containers have the same app (at least the same secret key used for signing), then they should all have access to the same session data.\nNote:\n\nThis is cryptographically signed, but it is not encrypted, so don't store sensitive information in the session\nFlask-Session can be installed for server-side session support","Q_Score":2,"Tags":"python,authentication,session,flask,kubernetes","A_Id":71044140,"CreationDate":"2020-05-28T17:28:00.000","Title":"Python Flask session for multiple instances","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on a web app in which some content is generated in the form of text (and will soon include images as well). I want to add a share button which will allow the user to add this content to their Instagram story. \nSo the flow of this is going to be:\n\n\nUser does something on the website\nThe website generates some content based on user input\nUser clicks on \"Share on Instagram\" and posts it on his\/her story \n\n\nIs there a way to do this using Javascript or an API call like the Twitter share option directly from the HTML ?\nI am using Python on the backend (Flask) and JS on the frontend","AnswerCount":2,"Available Count":1,"Score":1.0,"is_accepted":false,"ViewCount":7688,"Q_Id":62071327,"Users Score":10,"Answer":"OK, lets make this simple.\nThe direct answer as found on the official Facebook developers page is no. You can't trigger an API to create an instagram story, as for now only the \"read-mode\" is supported through API.\nBut as most things in life you can hack your way arround. Let's then copy a funcional method.\nYou create a button that says, \"share on your instagram stories\" and here's what it is gonna do:\n\nTrigger a function on the back-end that creates a screenshot\/image or a video of the content you want to share\nSend that content to the user so it's the last content they have in the gallery\nTrigger the open story camera in Instagram app with this link: instagram:\/\/story-camera. (the last content they have will be the content u sent and will be the first thing they see for posting a story)\n\nIt goes without saying that this will work when the website is opened in a phone and not in a desktop browser as in desktop you can't post stories.\nPS: I'm sure there is a way to send that content directly to the editing in the stories, so you don't have to select the image you sent to the client, but I didn't figure that out yet. Hope this works for you, cheers.","Q_Score":8,"Tags":"javascript,python,html,api,instagram","A_Id":65893635,"CreationDate":"2020-05-28T17:53:00.000","Title":"Share content of a webpage to Instagram story","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have had scores of servers running a Python script via Apache and mod_wsgi for years now. I recently am building on RHEL7 and have run into an issue where my Python script calling R procedures are bombing out only via Apache stating it cannot find my pip installed Python modules in my Apache log.\nimport pandas as pd\nModuleNotFoundError: No module named 'pandas'\nThis seems to only affect modules getting installed in \/usr\/local\/lib64\/python3.6\/site-packages which is where my custom modules are being installed with pip.\nEven if I append it, it ignores it.\nsys.path.append(r'\/usr\/local\/lib64\/python3.6\/site-packages')\nI manually built mod_wsgi from source.\nI'm ready to abandon mod_wsgi because I have to get my application deployed for my users.\nAny help is greatly appreciated.\nThanks,\nLou","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":169,"Q_Id":62078449,"Users Score":0,"Answer":"It was a file priv issue with \/usr\/lib64\/python3.6 and \/usr\/lib\/python3.6 directories and their child directories. Root ran fine, but running as Apache had no access. You had to chmod-R 755 on both directory trees. Worked fine with Apache after that. Sometimes it\u2019s the simple things we forget to check first.","Q_Score":0,"Tags":"python,python-3.x,apache,mod-wsgi","A_Id":62274064,"CreationDate":"2020-05-29T03:56:00.000","Title":"Running Python in mod_wsgi in Apache Cannot See Python Modules in \/usr\/local\/lib64\/python3.6\/site-packages","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a query string that will return data successfully if I run it in Postman but if I pull the data via Python3 (http.client.HTTPSConnection), the target returns 'bad request'.\nThe problem:\n\/v4_6_release\/apis\/3.0\/service\/tickets?customFieldConditions=caption=\"Escalated To\" AND value =\"Cloud Operations\"\nI have tried putting +AND+ or %20and%20 or %20AND%20 instead of AND but no success. For example:\n\/v4_6_release\/apis\/3.0\/service\/tickets?customFieldConditions=caption=\"Escalated To\"%20AND%20value=\"Cloud Operations\"\n^ This works fine in postman but returns <hr><p>HTTP Error 400. The request is badly formed.<\/p> when via Python3. \nIs there anything else wrong with the url encoding here?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":29,"Q_Id":62079936,"Users Score":1,"Answer":"You have to encode all whitespaces in you URL. So the URL should be \/v4_6_release\/apis\/3.0\/service\/tickets?customFieldConditions=caption=\"Escalated%20To\"%20AND%20value=\"Cloud%20Operations\"","Q_Score":0,"Tags":"python,python-3.x","A_Id":62080734,"CreationDate":"2020-05-29T06:30:00.000","Title":"Issue with URL encoding","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am more experienced in Java and Maven and a real beginner in Python, so I don't really have an idea about what possible to do and what not.\nIn Java, using Maven we can manage dependencies versions in a file (a pom parent \/ the aggregator module), then re-declare in pom.xml of the sub-modules the necessary dependencies while omitting their version being managed by the pom parent. This way, we can distribute the sub-modules physically separately (Ex: every module in a machine) and every module would package only its required dependencies, the libraries that are defined in its own pom file.\nNow back to Python, currently I use a setup.py file which, to my understanding, should be in the root module. But then it packages the whole modules as one library.\nIs there a way to manage better the modules and their dependencies and be able to deploy every (chosen) module separately as an independent package with its own needed libraires? I want to be able to choose the modules to package separately, I don't want that every folder containing __init__.py to be packaged seprately.\nCurrently I use Pipenv to manage my dependencies, but I am ready to drop it if it doesn't satisfy the design I have explained above.\nThank you","AnswerCount":4,"Available Count":1,"Score":0.049958375,"is_accepted":false,"ViewCount":633,"Q_Id":62081927,"Users Score":1,"Answer":"There is nothing that does exactly what you want (as far as I know, at least). In python the way we manage dependencies of a project or a library is using requirements.txt and virtual environments. Both of which manages the dependencies of the project as a whole. \nTo separate the individual modules out of the project you'd treat them as separate projects and do what every project would need. Make the requirements.txt or if you need to install it using setup.py put them inside that.\nSo, for every 'sub-library' you want to 'separate' make a different requirements.txt or setup.py. \nThere's this library called pipreqs (and possibly others) which scans a folder and generates the requirements file automatically. I'd always recommend hand-crafting the requirements file right after you install any library.","Q_Score":4,"Tags":"java,python,maven,packaging,pipenv","A_Id":62465155,"CreationDate":"2020-05-29T08:39:00.000","Title":"How to do in order to package python modules separately when organized in the same project?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"I know that there are ways to convert web site to mobile application using directories and platforms, but it seems like all the examples were on JavaScript. Does it also work with python flask web application?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":465,"Q_Id":62082499,"Users Score":0,"Answer":"You won\u2019t be able to convert python django application into a native mobile application.\nFor web application, both the client side and server side code is rendered through web browser. For mobile, client side code sits in native inside the mobile and all the dynamic stuff gets loaded from server through http\/https. Python django app is generally written in MVT format, UI is closely tied with server side backend code.\nTo convert your present app into mobile app requires:\nImplement django rest framework to write rest apis\nA native mobile app which can consume those apis (this is full mobile app development)\nWorkarounds:\nThere is a way where you write a small mobile app which loads your website. This can be done but only requirement is your site needs to be responsive UI and compatible on mobile browser","Q_Score":0,"Tags":"python,web,flask,mobile","A_Id":62082870,"CreationDate":"2020-05-29T09:15:00.000","Title":"Is there way to convert web application in python flask to mobile?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on a small webpage that uses geospacial data. I did my initial analysis in Python using GeoPandas and Shapely and I am attempting to build a webpage from this. The problem is, when using Django, I can't seem to find a way to keep the shape file stored as a constant object. Each time a request is made to do operations on the shapefile, I need to load the data from source. This takes something like 6 seconds while a standard dataframe deep copy df.copy() would take fractions of a second. Is there a way I can store a dataframe in Django that can be accessed and deep copied by the views without re-reading the shapefile?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":327,"Q_Id":62087354,"Users Score":0,"Answer":"Due to the nature of Django, global variables to not really work that well. I solved this problem in two different ways. The first was to just use django sessions. This way, the object you wanted to store globally now only needs to be loaded once per session on your website. Second and more efficient option is to use a cache server, either Redis or memcached. This will allow you to store and get your objects very quickly across all of your sessions and will increase performance the most.","Q_Score":0,"Tags":"python,django,geopandas,shapely","A_Id":62291698,"CreationDate":"2020-05-29T13:41:00.000","Title":"Can you store a constant global object in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I had similar problems with pip that was fixed with \"python3 -m\" but now after install Django I want to make a new project.\nWhen I try to run \"django-admin startproject ...\" I get \"bash: django-admin: command not found\".\nI don't know if I should mention it but, this is in a virtualenv.\npython3 -m pip freeze: Django==3.0.6\necho $PATH: \/home\/alatimer\/Environments\/DjangoTutoria_env\/bin:\/usr\/local\/sbin:\/usr\/local\/bin:\/usr\/sbin:\/usr\/bin:\/sbin:\/bin:\/usr\/games:\/usr\/local\/games:\/snap\/bin","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":411,"Q_Id":62087513,"Users Score":0,"Answer":"My problem was i was using python version 2.7 in the venv instead of version 3.6.9.\nI assume the older python couldn't recognize the commands (this even includes pip commands).","Q_Score":0,"Tags":"python,django,bash","A_Id":62093778,"CreationDate":"2020-05-29T13:50:00.000","Title":"\"bash: django-admin: command not found\" after running django-admin","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I had similar problems with pip that was fixed with \"python3 -m\" but now after install Django I want to make a new project.\nWhen I try to run \"django-admin startproject ...\" I get \"bash: django-admin: command not found\".\nI don't know if I should mention it but, this is in a virtualenv.\npython3 -m pip freeze: Django==3.0.6\necho $PATH: \/home\/alatimer\/Environments\/DjangoTutoria_env\/bin:\/usr\/local\/sbin:\/usr\/local\/bin:\/usr\/sbin:\/usr\/bin:\/sbin:\/bin:\/usr\/games:\/usr\/local\/games:\/snap\/bin","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":411,"Q_Id":62087513,"Users Score":1,"Answer":"Your problem is that your shell doesn't know where that program is, and the places it searches doesn't have it. \nNotably, the shell would look for a program specifically if the name were qualified some way, where you name a location at the start. So, you could use \"\/long\/path\/to\/django-admin\" or \".\/django-admin\" (if it's in the \".\" current directory).\nAlways qualify names that aren't standard programs. It isn't safe to mutate PATH to include a path relative to your current directory .. Instead, name your personal programs with location when you run them, .\/program .","Q_Score":0,"Tags":"python,django,bash","A_Id":62094051,"CreationDate":"2020-05-29T13:50:00.000","Title":"\"bash: django-admin: command not found\" after running django-admin","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am facing an issue with pyspark while running this in local mode. And the tricky thing is when I open cmd and run pyspark it creates a session and then if I open the localhost:4040 I can see the UI. But, if I run some program from pycharm I am not able to access the UI (localhost:4040) also the URL is not generated. \nAnd in other case when I have the pyspark shell open in parallel with pycharm program and if I run the same program in pycharm I will get a warning saying cannot bind port 4040 so attempting 4041. which is a bit understandable as shell has occupied port 4040 so it is attempting 4041. So, ideally 4041 should be allocated but that is not the case. As the documentation says it attempts 16 times, to get the next free port number available, I have not been allocated with any. So, then if I see the services running currently on my PC, I could see none of them are using those ports.\nPlease help me with this.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":273,"Q_Id":62088457,"Users Score":0,"Answer":"The warning \"port 4040 is unaviable, attempting 4041\" and forawrd..., is occures probably, because you open a a lot of SparkContext without close them.(SparkContext#close).\nYou can change the port if you want by the parameter spark.ui.port in configuration.\nFor your first issue, can you provide logs please of the running spark app? maybe you are running a fast program that close the web ui fast enough before you enter?","Q_Score":0,"Tags":"python,scala,apache-spark,pyspark","A_Id":62088572,"CreationDate":"2020-05-29T14:38:00.000","Title":"pyspark bind issue cannot generate the SPARK UI","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am running a Django project on NGINX + UWSGI. It's working properly in LAN, but from outside it shows just the NGINX default page. What can be a problem here?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":121,"Q_Id":62090852,"Users Score":0,"Answer":"You should check if your router is redirecting the traffic to your nginx server, also check if your ISP is giving you an public IP, there is several scenarios that won't let you access to you nginx server please check if the you have a public IP and then we you can check your router in order to check if the http traffic is being redirected to your local server","Q_Score":0,"Tags":"python,nginx,uwsgi","A_Id":62091088,"CreationDate":"2020-05-29T16:48:00.000","Title":"NGINX server works normally in LAN, but doesn't work outside of it","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"A function in Faker script to add data in my model Department.\n    \ndepartment = ['I.T.','C.S.E','M.E.','E.C.']\ndef add_dept():\n    d = Department.objects.get_or_create(dept_name=random.choice(depatment))[0]","AnswerCount":4,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":683,"Q_Id":62091767,"Users Score":0,"Answer":"The function you're calling returns a list or a tuple. In either case, the [0] simply extracts the first element from the result, and throws any remaining results away.","Q_Score":3,"Tags":"python,django","A_Id":62091825,"CreationDate":"2020-05-29T17:43:00.000","Title":"Why do we write [0] after get_or_create in model_name.object.get_or_create() in django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have FLask web development server running on my Mac @ 127.0.0.1:5000\/. Both my mac and my android device are connected to the same WLAN. I am unable to access my flask website by entering the IP address of my mac(192.168.8.103:5000) into the browser of my android device. But I can access the webpage from my apache server running on my Mac by entering 192.168.8.103 into the browser of my android device. Can I access the flask webserver from my mobile?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":3749,"Q_Id":62098072,"Users Score":6,"Answer":"You need to run the app with your IPv4 address \napp.run(debug=True, host= '192.168.8.103') assuming 192.168.8.103 is your IPv4 if not, replace it with your IPv4","Q_Score":2,"Tags":"python-3.x,web,flask","A_Id":62108443,"CreationDate":"2020-05-30T05:06:00.000","Title":"How to access Flask web server from mobile device?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In django, if I want to use csrf token, I need to imbed a form with csrf token in django template. However as a backend-engineer I am co-working with a front-end engineer whose code is not available for me. So I caanot use the template. In this case, if I want still the csrf function. what should I do?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":31,"Q_Id":62098555,"Users Score":0,"Answer":"you should ask the coworker to embed the csrf token in the form he is sending you\nyou can get it from document.Cookies if he doesnt want to or cannot use the {% csrf %} tag","Q_Score":0,"Tags":"python,django","A_Id":62098568,"CreationDate":"2020-05-30T06:09:00.000","Title":"how to implement csrf without csrf token in django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"i am new to django developement after making changes to my model i tried to run the command python manage.py makemigrations my_app \nit detects changes in my model and shows me the message \ntodoapp\/migrations\/0001_initial.py\n    - Create model confess\n    - Create model UserChoice\n    - Create model comment \nbut on executing  python manage.py migrate my_appcommand i've got this message \nNo migrations to apply.\ni usually do this after making changes in models, i don't know what happened now.\nplss help me.","AnswerCount":2,"Available Count":1,"Score":-0.0996679946,"is_accepted":false,"ViewCount":237,"Q_Id":62099242,"Users Score":-1,"Answer":"Delete all migrations files and __pychache__except__init__.py from your project and app. Also db.sqlite3 database then rerun makemigrations and migrate commands. It should solve your issue.","Q_Score":0,"Tags":"django,python-3.x","A_Id":62099352,"CreationDate":"2020-05-30T07:30:00.000","Title":"Django - Make migration command detects changes but on migrating says 'No migrations to apply'","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I crawled and saved the user's website usage lists.\nI want to analyze the results of the crawl, but I wonder how there is a way.\nFirst of all, what I thought was Word Cloud.\nI am looking for a way to track user's personal preferences with user's computer history. \nI want a way to visualize personal tendencies, etc. at a glance. Or I'm looking for a way to find out if there's no risk of suicide or addiction as a result of the search.\nthank you.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":18,"Q_Id":62100079,"Users Score":0,"Answer":"If you want to visualize data and make analysis on it matplotlib would be good start , again it depends a lot on your data. Matplotlib and seaborn are plotting libraries that are good for representing quantitative data and get some basic analysis at least.","Q_Score":0,"Tags":"python,word-cloud","A_Id":62100135,"CreationDate":"2020-05-30T08:51:00.000","Title":"How to analyze crawl results","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Many people use jinja template rendering for their web base apps.\nA high percentage of apps have a few templates but when the app gets popular,  templates will be processed many times.\nI wanna to know that is processing the templates a bottleneck as app gets more hits?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":24,"Q_Id":62105254,"Users Score":1,"Answer":"jinja2 is robust enough to render templates responsively but the problem is seen when you have a heavy\/blocking tasks to process (requesting database, bulk operations ..) before passing variables to jinja2 to render templates.\nso with a good application design comes a good performance.\n\nadd caching support, use 3rd Flask extensions like flask-caching\nuse Task Queues apps (like redis or celery ..) to handle asynchronously in  background a long-running jobs that would dramatically reduce the performance of an HTTP response\nuse an HTTP accelerator like varnish","Q_Score":0,"Tags":"python,templates,jinja2,jit","A_Id":62623271,"CreationDate":"2020-05-30T16:14:00.000","Title":"JITing html template files","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to install \/ run Head-Less Chrome in AWS Lambda but getting the following Error when I test it through Lambda.\n\"errorMessage\": \"Message: Service \/tmp\/bin\/chromedriver unexpectedly exited. Status code was: 127\\n\",\n  \"errorType\": \"WebDriverException\"\nI am using ChromeDriver 83.0.4103.39 for Linux.\nSteps performed in Python:\n\nCreated \/tmp\/bin in Lambda\nCopy Chrome Driver to \/tmp\/bin\nChanged the permission to 0777\n\nPython Code:\nThrowing error on the following line -\ndriver = webdriver.Chrome(chrome_options=chrome_options, executable_path= \"\/tmp\/bin\/\" + chrome_linux_driver)\nCode is working fine when I am running under windows with same windows Chrome driver.\nAny help is really appreciated.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1096,"Q_Id":62110569,"Users Score":0,"Answer":"The error might come from the fact that the chromedriver version and the headless chromium binary you are using aren't the same so make sure to download the same version for both\nanother reson could be that you are not using linux chromedriver and headless chromium and since lambda work on linux the code won't work\nhopefully this was useful.","Q_Score":8,"Tags":"python,selenium,aws-lambda,selenium-chromedriver","A_Id":68178317,"CreationDate":"2020-05-31T01:31:00.000","Title":"Headless Chrome Python 3.8 on AWS Lambda - unexpectedly exited. Status code was: 127","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I created a table with an initial IntegerField primary key and later changed the id to a UUIDField. Now this raises a \"Badly formed hexadecimal UUID string\", I guess because a number such as \"1\" isn't a valid UUID value. Does anyone know a concise way to fix this in code when updating the models.py file for the django app?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":229,"Q_Id":62119274,"Users Score":0,"Answer":"Before everything, double check that you don't have any foreign key with Cascade uppon this model. Then, instead of changing the type of id = models.IntegerField() :\n\ncreate a new field uuid = models.UUIDField(default=uuid.uuid4, primary=True) (default will set the field for existing rows)\nmake migrations\nremove the id field\nmake migrations\nrename the uuid field to id\nmake migrations\nmigrate\n\nHowever, you should know that removing the id field, and \/ or naming the uuid is not mandatory, and it's often a good idea to keep both.","Q_Score":0,"Tags":"python,django,python-3.x,uuid,django-3.0","A_Id":62121735,"CreationDate":"2020-05-31T16:31:00.000","Title":"Fixing error \"Badly formed hexadecimal UUID string\" after converting existing id to uuid in Django (Django 3.0)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to Django and trying to understand the model relationships, here is my use case:\nI have a Creator object which can create multiple Listing under a Category. Category can have multiple Listings from multiple Creators. \nCreator -- Creates a Listing about a service -- under a Category or multiple Category\nI am trying to find the thought process behind picking the correct relationship while defining this kind circular  relationship.  Which one of the model should go first? Is it Category which is first and Creator second and Listing at the end, is Creator, Category and Listing all belong to a Many to Many relationship, if then how are they linked?","AnswerCount":2,"Available Count":1,"Score":-0.0996679946,"is_accepted":false,"ViewCount":193,"Q_Id":62126391,"Users Score":-1,"Answer":"In Django Models there are three types of relationships.\none to one - when one entity is unique to other entity\nExample: A user model can be in one to one relationship to customer model.\nEvery customer is unique user\nmany to many - When one entity can has relationship with many other entities and vice versa.\nExample : pizza and toppings,\npizza can have many toppings, and same topping can be applied on various pizza\none to many - also called foreign key in Django  when a single entity is related to many other entities but vice versa is not true.\nExample: your Use case applies here.\nA creator can create multiple listings but a single listing can be mapped to single creator only, not multiple creator.","Q_Score":1,"Tags":"python,django,django-models","A_Id":62126542,"CreationDate":"2020-06-01T05:50:00.000","Title":"Django model relationship with circular relationship","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Bokeh callbacks with CustomJS: is there a way to trigger a callback with CustomJS from inside another callback with custom JS? Additionally and related to the first question: is there a way to prevent triggering a callback when modifying the property or producing the event that triggers that callback? I have been trying to find information or a way to do this from the Bokeh docs but I can't find anything.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":540,"Q_Id":62126663,"Users Score":0,"Answer":"Calling CustomJS from CustomJS - yes, absolutely. CustomJS is an object with an execute method that accepts cb_obj and cb_data. Just call it like a regular method and that's it.\nSetting a property without triggering callbacks - it's possible in JavaScript, but it's an implementation detail that you should not rely on. If you're interested, look up the source of the HasProps class in BokehJS source code, it has a setv method. And I don't think it's possible at all in Python.","Q_Score":1,"Tags":"javascript,python,callback,bokeh","A_Id":62130620,"CreationDate":"2020-06-01T06:15:00.000","Title":"Bokeh callbacks with CustomJS: is there a way to trigger a callback with CustomJS from inside another callback with custom JS?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using Django 3.0 and I was wondering how to create a new database table linked to the creation of each user. In a practical sense: I want an app that lets users add certain stuff to a list but each user to have a different list where they can add their stuff. How should I approach this as I can't seem to find the right documentation... Thanks a lot !!!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":90,"Q_Id":62159202,"Users Score":0,"Answer":"This is too long for a comment.\nCreating a new table for each user is almost never the right way to solve a problem.  Instead, you just have a userStuff table that maintains the lists.  It would have columns like:\n\nuserId\nstuffId\n\nAnd, if you want the stuff for a given user, just use a where clause.","Q_Score":0,"Tags":"python,sql,django,database","A_Id":62159631,"CreationDate":"2020-06-02T18:46:00.000","Title":"A new table for each user created","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an API deployed on Cloud Run where each request results in a read + write to Cloud Datastore. A non-trivial amount of the requests are first timers (read from Datastore will return null), so adding caching in front of it may not be too helpful.\nOver the past month, the average wall time around calling Datastore and having the data (data = client.get(key, eventual=True)) is 48ms. The payloads are small (a list of dicts, with 10 elements on average, and each dict has two floats).\nI'm not sure if I should say that latency is high, but my API has a budget of 100ms to do all that it needs to do and return. If just the data fetching takes ~50% of that time, I'm looking for ways to optimize things.\nQuestions:\n\nIn general, how does 50ms sound for fairly small payloads, fetched by key, from within GCP?\nWhat should I expect (in terms of latency) from Memorystore within GCP?","AnswerCount":1,"Available Count":1,"Score":0.6640367703,"is_accepted":false,"ViewCount":747,"Q_Id":62160701,"Users Score":4,"Answer":"Assuming you are using Cloud Run and Datastore on the same location, I would say that 50ms is around the expected latency you'd have for reading on datastore, the size of the payload does not matter as much for reads (10 - 1000 document reads do not make a big difference on time of processing\/propagating).\nSince you have such a small window for your API to operate, this could indeed be a problem if some unnexpected delays occur.\nI have never used Memorystore so I can't say what you could expect of actual latency but it might be a better option given that every ms to your app counts.","Q_Score":2,"Tags":"python,optimization,google-cloud-datastore,low-latency,google-cloud-memorystore","A_Id":62178198,"CreationDate":"2020-06-02T20:17:00.000","Title":"Google Cloud Datastore latency","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm currently making a small hobby project where I use a Raspberry Pi Zero to control a set of RGB LED's.\nI've got a basic python app so far that is built on Flask that allows me to set up a web server so that the LED colours can be set remotely.\nMy main concern is that I'm self-taught as far as programming goes and I don't know squat about security.\nThe plan is essentially to be sending any port 80 traffic to the raspberry pi on my home network and give friends my IP. I may eventually get a domain name to simplify things.\nShould I have any security concerns when I set this up live full-time? I don't know if it's possible to access my private network via the raspberry pi or if I'm just being paranoid.","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":199,"Q_Id":62162817,"Users Score":1,"Answer":"You can try putting your Raspberry PI on separate vlan and put your home devices on another vlan. Please note you need a router which supports vlan and configure it in a way that the both vlans cant talk to each other \nAlso, try using HTTPS for your webserver and don't run the webserver process as root user. If you want to go more crazy you can put a firewall.\nThese are generic suggestions for hardening the security for any web app.","Q_Score":1,"Tags":"python,security,flask,raspberry-pi","A_Id":62162893,"CreationDate":"2020-06-02T23:12:00.000","Title":"Raspberry Pi as a web server security","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am developing a mobile application using the react native library with the JavaScript language. On the other hand, I have an image processing code that I wrote in python. Is it possible to combine them? Can I put python in my React native code?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":124,"Q_Id":62163119,"Users Score":0,"Answer":"No this is not possible. What are you trying to achieve? Why do you thing that embedding python in your React native code is the way to achieve it?","Q_Score":1,"Tags":"javascript,python,react-native","A_Id":62163782,"CreationDate":"2020-06-02T23:52:00.000","Title":"How to access python library in javascript react native library","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a python script that hits the \/v3\/surveys?pagenum end point. My plan was to calculate the number of responses in the Json and the number of pages (rounded up from 50\/page) and compare this with data already brought in from that endpoint. My thinking was if the number of responses in the DB and the Site differed, I could just bring in the last page or pages from the SurveyMonkey API\nThe code works but what I've found is the new Surveys don't necessarily appear on the last pages They can be on any page. How do I just bring in new Content without re downloading everything. Is this the case with every other endpoint as well? I've looked through the api on the Survey Monkey Site but didn't see anything geared towards getting new content\nI have a limited number of api calls and don't really want to download everything each time as this data changes frequently. Any guidance would be appreciated.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":229,"Q_Id":62163671,"Users Score":0,"Answer":"Register a webhook. It will tell you when there is a new response.","Q_Score":1,"Tags":"python,surveymonkey","A_Id":62272844,"CreationDate":"2020-06-03T01:09:00.000","Title":"Survey Monkey - Retrieve new Responses only via API","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I know there is a lot of debate within this topic.\nI made some research, I looked into some of the questions here, but none was exactly it.\nI'm developing my app in Django, using Python 3.7 and I'm not looking to convert my app into a single .exe file, actually it wouldn't be reasonable to do so, if even possible.\nHowever, I have seen some apps developed in javascript that use bytenode to compile code to .jsc\nIs there such a thing for python? I know there is .pyc, but for all I know those are just runtime compiled files, not actually a bytecode precompiled script.\nI wanted to protect the source code on some files that can compromise the security of the app. After all, deploying my app means deploying a fully fledged python installation with a web port open and an app that works on it.\nWhat do you think, is there a way to do it, does it even make sense to you?\nThank you","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":83,"Q_Id":62169485,"Users Score":0,"Answer":"The precompiled (.pyc) files are what you are looking for. They contain pre-optimized bytecode that can be run by the interpreter even when the original .py file is absent. \nYou can build the .pyc files directly using python -m py_compile <filename>. There is also a more optimized .pyo format that further reduces the file size by removing identifier names and docstrings. You can turn it on by using -OO.\nNote that it might still be possible to decompile the generated bytecode with enough effort, so don't use it as a security measure.","Q_Score":1,"Tags":"python,django","A_Id":62170274,"CreationDate":"2020-06-03T09:30:00.000","Title":"How to compile single python scripts (not to exe)?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I created a aws windows instance (linux is sadly no option in this particular case) on which i deployd a python script using flask-restful. \nI added inbount traffic rules to allow http traffic on port 80. \nThe Flask api is being hostet on host=0.0.0.0, port=80 and debug is False. \nThe api is reachable via browser on the server running it.\nSadly im not able to reach the api from external servers. I thought it might be a internal issue between public and internal ip so i tryd reverse proxing that with nginx with no result as well. \nDoes somebody have an idea what i could do.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":35,"Q_Id":62184248,"Users Score":1,"Answer":"Based on the comments, the issue was windows firewall. \nThe solution was to allow the connection in the firewall.","Q_Score":1,"Tags":"python,windows,amazon-web-services,flask,firewall","A_Id":62184660,"CreationDate":"2020-06-03T23:12:00.000","Title":"Allow traffic on AWS windows instance with flask restful","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to find out what the best tool is for my project.\nI have a lighttpd server running on a raspberry pi (RPi) and a Python3 module which controls the camera. I need a lot of custom control of the camera, and I need to be able to change modes on the fly. \nI would like to have a python script continuously running which waits for commands from the lighttpd server which will ultimately come from a user interacting with an HTML based webpage through an intranet (no outside connections). \nI have used Flask in the past to control a running script, and I have used FastCGI to execute scripts. I would like to continue using the lighttpd server over rather than switching entirely over to Flask, but I don't know how to interact with the script once it is actually running to execute individual functions. I can't separate them into multiple functions because only one script can control the camera at a time. \nIs the right solution to set up a Flask app and have the lighttpd send requests there, or is there a better tool for this?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":105,"Q_Id":62195974,"Users Score":0,"Answer":"You have several questions merged into one, and some of them are opion based questions as such I am going to avoid answering those. These are the opinion based questions.\n\nI am trying to find out what the best tool is for my project.\nIs the right solution to set up a Flask app and have the lighttpd send requests there\nIs there a better tool for this?\n\nThe reason I point this out is not because your question isnn't valid but because often times questions like these will get flagged and\/or closed. Take a look at this for future referece.\nNow to answer this question: \n\" I don't know how to interact with the script once it is actually running to execute individual functions\"\nTry doing it this way:\n\nModify your script to use threads and\/or processes.\nYou will have for example a continously running thread which would be the camera.\nYou would have another non blocking thread listening to IO commands.\nYour IO commands would be comming through command line arguments.\nYour IO thread upon recieving an IO command would redirect your running camera thread to a specific function as needed.\n\nHope that helps and good luck!!","Q_Score":0,"Tags":"python,flask,lighttpd,pi,picamera","A_Id":62197672,"CreationDate":"2020-06-04T13:32:00.000","Title":"Use HTML interface to control a running python script on a lighttpd server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to find out what the best tool is for my project.\nI have a lighttpd server running on a raspberry pi (RPi) and a Python3 module which controls the camera. I need a lot of custom control of the camera, and I need to be able to change modes on the fly. \nI would like to have a python script continuously running which waits for commands from the lighttpd server which will ultimately come from a user interacting with an HTML based webpage through an intranet (no outside connections). \nI have used Flask in the past to control a running script, and I have used FastCGI to execute scripts. I would like to continue using the lighttpd server over rather than switching entirely over to Flask, but I don't know how to interact with the script once it is actually running to execute individual functions. I can't separate them into multiple functions because only one script can control the camera at a time. \nIs the right solution to set up a Flask app and have the lighttpd send requests there, or is there a better tool for this?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":105,"Q_Id":62195974,"Users Score":1,"Answer":"I have used Flask in the past to control a running script, and I have used FastCGI to execute scripts.\n\nGiven your experience, one solution is to do what you know.  lighttpd can execute your script via FastCGI.  Python3 supports FastCGI with Flask (or other frameworks).  A python3 app which serially processes requests will have one process issuing commands to the camera.\n\nI would like to continue using the lighttpd server over rather than switching entirely over to Flask, but I don't know how to interact with the script once it is actually running to execute individual functions.\n\nConfigure your Flask app to run as a FastCGI app instead of as a standalone webserver.","Q_Score":0,"Tags":"python,flask,lighttpd,pi,picamera","A_Id":62200945,"CreationDate":"2020-06-04T13:32:00.000","Title":"Use HTML interface to control a running python script on a lighttpd server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new in python. I am creating an API in python using flask-restful. I have created APIs in java.In java we have pom.xml file for dependencies...is there any for python and flask-restful","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":2788,"Q_Id":62209131,"Users Score":0,"Answer":"I would recommend using pipenv.\nIn Java, you need to know where your library dependencies are located and they usually are downloaded once for each project as you need them. In other words, each project will have their own set of plugins. This is also the same for non-global NPM packages (package.json), Ruby gems (Gemfile), and so on.\nBut in Python, everything you install with pip is global. Anything you install with pip will make your system Python installation messy at best and at worst will not be portable between developer machines. We get around this problem with the concept of a virtual environment which more or less is a copy of whatever Python version you're using self-contained to a project.\npipenv works pretty similarly to npm.\nYou initialise with pipenv --three and use pipenv install Flask (for example) to install packages and keep track of them in Pipfile.toml and a lock file. You can then clone it on another computer and pipfile install to install all dependencies.\nIf this tool does not work for you, you may also want to try pyenv and virtualenv and use a requirements.txt file as suggested by Rahul.\nHope that helps!","Q_Score":1,"Tags":"python-3.x,flask-restful","A_Id":62209923,"CreationDate":"2020-06-05T06:06:00.000","Title":"Dependency file in python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Some days ago a guy explained me that on ruby on rails the queries are done on models. Because it gets already saved at your data before be requested on views and the query.\nBy the way I've learned and had been working until now, I'm setting the query on views.py and passing, through a context variable. So I started to read about Model.Manager and still didn't find a answer to which way is better:\n\nqueries made on views\nqueries made by simple functions on models\nqueries made on models.Manager class for each model","AnswerCount":4,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":1140,"Q_Id":62209330,"Users Score":1,"Answer":"Use custom QuerySets and ModelManagers in your models\ncall your model's ModelManager custom methods from within your views\npass the returned values (querysets, instances or whatever) to the templates (or JSON serializer etc)\n\nIt's a matter of separation of concerns:\n\nthe template (or json serializer or whatever) doesn't have to know where data come from nor they were obtained - only what the data structure is\nviews don't have to know about how the query is implemented, only on how to get relevant data\nonly the model layer should know about it's implementation (encapsulation 101)","Q_Score":0,"Tags":"python,django,python-3.x,django-models,django-views","A_Id":62210858,"CreationDate":"2020-06-05T06:23:00.000","Title":"Querysets on views or on Model Managers DJANGO","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Some days ago a guy explained me that on ruby on rails the queries are done on models. Because it gets already saved at your data before be requested on views and the query.\nBy the way I've learned and had been working until now, I'm setting the query on views.py and passing, through a context variable. So I started to read about Model.Manager and still didn't find a answer to which way is better:\n\nqueries made on views\nqueries made by simple functions on models\nqueries made on models.Manager class for each model","AnswerCount":4,"Available Count":2,"Score":0.049958375,"is_accepted":false,"ViewCount":1140,"Q_Id":62209330,"Users Score":1,"Answer":"According to the Django idioms want to add some advice that can be useful:\n\nmodel managers it's a place for most common queries, not for all queries. Managers describe basic methods for working with models. If you have a widely-used logic for your model with queryset - put it to the manager's method. For example, my users split by domains, so I want to get the user by name and domain, so add the get_by_name_and_domain method to the user model manager. Also, you can access your model by the model attribute in the manager.\nmodels are the part of MTV (Model-View-Template) model on Django and the main purpose of the 'model' itself is to describe db-object but not related business logic. So put your custom queries to views and remember about DRY principle.","Q_Score":0,"Tags":"python,django,python-3.x,django-models,django-views","A_Id":62211170,"CreationDate":"2020-06-05T06:23:00.000","Title":"Querysets on views or on Model Managers DJANGO","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My python app (evernote-sdk-python3) worked fine until June, 3rd. Suddenly it breaks e.g. when I call \"client.get_user_store()\" or \"client.get_note_store()\". All calls to \"evernote.edam.userstore.UserStore.Client\" respond with HTTP status 400 (The server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing)). I tried it in a sandbox and on the production server and I renewed the auth token. Nothing helped. Something on evernote's side must have changed. My app worked perfectly before.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":81,"Q_Id":62217041,"Users Score":0,"Answer":"the Evernote python3 SDK just got a patch, please grab the latest and try again","Q_Score":0,"Tags":"python-3.x,api,evernote","A_Id":62314769,"CreationDate":"2020-06-05T13:57:00.000","Title":"evernote.edam.userstore.UserStore.Client: HTTP Status 400","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to string together lambda functions. The first lambda function is on a 30 minute timer to scrape and put the data in a S3 bucket, the next lambda function retrieves and parses that data and puts it in a seperate S3 bucket, and the last function performs analysis on that data and sends the user (in this case myself) an email of the results via pythons smtplib module.\nInstead of having the last two lambda functions running on timers, I want the second function to be triggered when the first function is done, and the last function to be triggered when the second function is done. As well as, deleting the two folders in the first S3 bucket and the contents in the second S3 bucket to save on memory and processing time.\nIs there a way to do this totally in the AWS web interface rather than rewrite the python code I already have?","AnswerCount":5,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":732,"Q_Id":62220738,"Users Score":0,"Answer":"All the answers here work. To summarize, you could:\n\nTrigger the lambdas when a file arrives in an S3 bucket\nUse Step Functions co-ordinate the 3 lambda functions, one after another\nUse Lambda destinations (on success) to orchestrate the workflow\n\nAll of these accomplish what you wish for, and here's some extra info.\n\nFor the S3 option you can specify which events trigger the lambda (e.g. PutObject), and even the prefix and suffix of the file(s).\nFor Step functions, this is my favorite options. It's an expensive option (typically 5-10x more than lambda) but, it actually orchestrate everything, and the view you get from the console is amazing. It's very easy to triage issues if they occur.\nFor Lambda destinations, you can also set a onFailure mode, so that the you can get alerted if the function fails. onSuccess will of course lead to the next function in question.\n\nHope that helps.","Q_Score":2,"Tags":"python,amazon-web-services,amazon-s3,aws-lambda","A_Id":62231258,"CreationDate":"2020-06-05T17:11:00.000","Title":"AWS Lambda function completion triggers another lambda function","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working on a button where I have a project document open and a family document open. I'm trying to close the family document however I'm getting an error saying:\nAutodesk.Revit.Exceptions.InvalidOperationException: 'Close is not allowed when there is any open sub-transaction, transaction, or transaction group.'\nI've checked all of my transactions and they are all started and committed using transactionName.Start(document) and transactionName.Commit()\ndoes anyone know of a way to check for any ongoing active transactions?\nI have also tried using\n'RevitCommandId closeDoc = RevitCommandId.LookupPostableCommandId(PostableCommand.Close);\nuiapp.PostCommand(closeDoc);'\nhowever that tends to only want to close my project document.\n\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/UPDATE\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\nsoooo I just found out I didn't need to use uiapp.OpenAndActivateDocument(). I didn't know you could edit a family without opening the document. That solves my problem. I'm still curious if there's a way to check for open transactions though.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1613,"Q_Id":62224410,"Users Score":0,"Answer":"Afaik, the Revit API does not enable you to check from outside whether a transaction is started. You need access to the Transaction object itself to check its status. If you did not create it yourself, you have no access to it.\nHow did you open the two documents? \nWhat Revit commands did you execute in them?","Q_Score":1,"Tags":"revit-api,revit,revitpythonshell,pyrevit","A_Id":62237207,"CreationDate":"2020-06-05T21:32:00.000","Title":"Revit API - How to check for open Transactions, Sub-transactions, or Group Transactions","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am developing ecommerce website in django .\nI have view ( addToCart)\nI want sure before add to cart if user logged in or not \nso that i use @login_required('login') before view\nbut when click login it show error (can't access to page ).\nNote that: normal login is working","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":58,"Q_Id":62232101,"Users Score":0,"Answer":"Please check the following\n1. Add login url on settings\n2. Add redirect url on login required decorator\n3. If you create a custom login view make sure to check next kwargs","Q_Score":0,"Tags":"python,django,django-views","A_Id":62232761,"CreationDate":"2020-06-06T13:00:00.000","Title":"Login required in django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to add a new table in existing database without affecting existing tables and its datas. After adding new model class into models.py, what are steps needs to follow to add new table?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1407,"Q_Id":62237970,"Users Score":1,"Answer":"Once you've added the new model in your models.py, you just need to run db.create_all(). You can add this in your code somewhere (probably directly) after you initialize your app\/database. Be sure to include with app.app_context() if you aren't calling create_all in a view. Hope this helps!","Q_Score":2,"Tags":"python,flask,flask-sqlalchemy","A_Id":62240624,"CreationDate":"2020-06-06T20:59:00.000","Title":"How to add new table in existing database of flask app using sqlalchemy?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm building a simple Django contact center app using Twilio, TaskRouter, Client JS SDK.\nI'm using the status_callback to save the calls log for each customer in db by listening to the request with complete status_callback_event. (not sure this is the best way but it does the job)\nHow would you go about saving the worker who received the incoming call?\nFor outgoing calls I'm passing the request.user in the url as a custom parameter and I'm getting it in the status_callback.\nFor incoming calls I'm getting the ParentCallSid in the status_callback, I assume I can use it to fetch the client who handled the call through the Rest API.\nAm I doing the right thing here? is there a simpler way to get this done?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":87,"Q_Id":62238996,"Users Score":0,"Answer":"I used in the end TaskRouterEvents to listen to reservations events (reservation.completed or reservation.canceled) I took the WorkerSid from the POST request and saved it in db. \nI think this is the easiest way to go about doing this. \nFor outgoing calls I'm passing the WorkerSid in the url as a custom parameter and I'm getting it in the status_callback.","Q_Score":0,"Tags":"javascript,python,django,twilio,twilio-taskrouter","A_Id":62341583,"CreationDate":"2020-06-06T23:01:00.000","Title":"How to get Twilio worker for incoming calls using TaskRouter? - Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My django app is containerized along side postgresql. The problem is that migrations do not seem to be persisting in the directory. Whenever I run docker exec -it <container_id> python manage.py makemigrations forum, the same migrations are detected. If I spin down the stack and spin it back up the and run makemigrations again, I see the same migrations detected. Changes to the fields, adding models, deleting models, none ever get detected. These migrations that do appear seem to be getting written to the database, as when I try to migrate, I get an error that there are existing fields already. But if I look at my migrations folder, only the init.py folder is present. All the migrate commands add no changes to the migrations folder.\nI also tried unregistered the post model from the admin and spinning up the stack, yet I still see it present in the admin. Same things with changes to the templates. No change I make sticks from inside docker seems to stick.\n*Note this problem started after I switched to wsl 2 and enabled it in docker desktop (windows)\n**Update migrations can be made from bash of docker container","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":70,"Q_Id":62247294,"Users Score":0,"Answer":"I found out what the problem was. My docker-stack.yml file was pointed to a directory that did not exist in the dockerfile.","Q_Score":0,"Tags":"django,python-3.x,docker","A_Id":62267183,"CreationDate":"2020-06-07T15:03:00.000","Title":"Django migrations not persisting","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a project and i was wondering how can i make a button in my web that when it is being clicked it can display a string in my python terminal\nThank you in advance","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":172,"Q_Id":62255012,"Users Score":0,"Answer":"You need to create an http server in your Python, and call it with fetch in JavaScript. You can pass data in the query parameters.","Q_Score":0,"Tags":"python,html","A_Id":62255040,"CreationDate":"2020-06-08T04:26:00.000","Title":"How can i make a button in my web that when it is being clicked. it can send a data in my python script","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is it possible to have a website where the landing page is a Flask app hosted through Heroku, connected to an online store that is hosted through Shopify?\nFor example, website.com is my Flask landing page. Then shop.website.com is a Shopify store selling my products.\nIf possible, what do I need to do?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":115,"Q_Id":62256777,"Users Score":0,"Answer":"Yes that's possible, but has nothing to do with Flask.\nYou can set your A record of website.com to point to your Heroku server.\nFor the Shopify part, I am not familiar with how exactly you set this up on their site, but they have a documentation where you can learn how to set up a subdomain (e.g. shop.website.com) to use with your Shopify shop.","Q_Score":0,"Tags":"python,flask,shopify","A_Id":62260199,"CreationDate":"2020-06-08T07:10:00.000","Title":"Flask landing page with Shopify web store","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to render a session of a bokeh plot on a flask server. The problem I have is, that the generated script tag of that session only produces the plot after I reload the flask server. \nThe reload takes place by saving the server file. \nIs there a way to force this event in the underlying python code? Something like Flask.reload()?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":125,"Q_Id":62262970,"Users Score":0,"Answer":"My tip is: create a new route to process the information you want and make a request via javascript (jquery\/ajax) to get the data and popularize the charts.\nJavascript is responsible for performing this type of action. After a template is rendered, only JS can make changes in the DOM (no more python responsibility).","Q_Score":0,"Tags":"python,session,flask,server,bokeh","A_Id":62269368,"CreationDate":"2020-06-08T13:16:00.000","Title":"How to force auto reload of Flask in code?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"When installing the same Odoo app for multiple databases (tenants), say Sales App, does this mean Odoo will load the same App multiple times in memory, or the App will be loaded once in memory and shared across tenants\/DBs?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":79,"Q_Id":62271693,"Users Score":1,"Answer":"Odoo loads the app in a worker (assuming you are using workers) so the app is loaded once per worker. A worker can handle multiple databases if configured. But if you have multiple workers the app might get loaded in each worker as requests are reaching the different workers.\nSome part of the memory consumtion of odoo is the ORM caches and those are per database per worker (and some per user) so that part of the App will be in memory multiple times per worker as you have multiple databases.","Q_Score":1,"Tags":"python,python-3.x,odoo,odoo-13","A_Id":62276211,"CreationDate":"2020-06-08T21:47:00.000","Title":"Odoo - Apps in-memory footprint for multiple databases","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How should I save the path of a image uploaded in html page so that the path can be used as input to the python script","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":41,"Q_Id":62274672,"Users Score":0,"Answer":"Using Local Storage (require HTML 5) or cookie will solve your problem","Q_Score":0,"Tags":"javascript,python,html","A_Id":62274748,"CreationDate":"2020-06-09T03:44:00.000","Title":"is there a way to save the path of the file uploaded in html page","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to enable Django debugging in a particular apps in the whole project because when the site is go to production if found something anything bug then I will fix by enabling the debug in the particular view in Django app without affecting the other modules\nThank in advance.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":28,"Q_Id":62281401,"Users Score":0,"Answer":"I don't know how this can be done- but it probably shouldn't be done. \nExposing even a single app in debug mode could potentially leak security keys and more likely just lead to unexpected behavior, especially because django tries its best to prevent you from enabling debug mode outside of the development webserver. \nUse proper logging within your app to report and replicate errors and avoid debug in production. There various 3rd party services that can be very easily installed on your webserver and handle most of the error and traceback logging for you- likely at no cost (assuming you don't have thousands of errors to process).","Q_Score":0,"Tags":"django,python-3.x,server","A_Id":62283703,"CreationDate":"2020-06-09T11:19:00.000","Title":"How to enable debugging in a particular app in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have received a link with .ipynb  link. I am new to Python and Jupyter and I need to open the link to work on the details inside.\nThe link opens in my internet browser and I couldn't properly see the contents and bring it in to a Jupyter notebook. \nCould anyone please give me a tip how to handle such links for Python\/Jupyter?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":100,"Q_Id":62285116,"Users Score":0,"Answer":"Adding to Vinzee's answer: jupyter notebook starts in your home folder and you can't move up from there; only down into subfolders.  Open jupyter to see what folder it starts in, and make sure that you put the .ipynb file in that folder or one of its subfolders.","Q_Score":0,"Tags":"python,jupyter-notebook","A_Id":62285954,"CreationDate":"2020-06-09T14:36:00.000","Title":"How to bring a web browser with .ipybn link opened in my Jupyter?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have just started python. I am trying to web scrape a website to fetch the price and title from it. I have gone through multiple tutorial and blog, the most common libraries are beautiful soup and scrapy. My question is that is there any way to scrape a website without using any library?\nIf there is a way to scrape a website without using any 3rd party library like beautifulsoup and scrapy. It can use builtin libraries\nPlease suggest me a blog, article or tutorial so that I can learn","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":417,"Q_Id":62287967,"Users Score":2,"Answer":"Instead of using scrapy you can use urllib.\nInstead of beautifulsoup you can use regex.\nBut scrapy and beautifulsoup do your life easier.\nScrapy, not easy library so you can use requests or urllib.","Q_Score":1,"Tags":"python,web-scraping,beautifulsoup,scrapy,libraries","A_Id":62288047,"CreationDate":"2020-06-09T16:59:00.000","Title":"Scrape websites with python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working on an application with Bokeh server, which will be embedded into a Django app. The dataframe is quite large, and the application runs slow, especially when using the Select and Slider widgets and Bokeh tools. At the moment I can't understand the difference between Bokeh server (Python Callbacks) and Bokeh JS (CustomJS Callbacks). From your experience, is it possible for Bokeh JS to run faster? Thank you!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":117,"Q_Id":62296821,"Users Score":1,"Answer":"It is possible to make it run faster once the page and all the plots are loaded. The initial loading may as well be slower simply because you will have to load all the data so it could be used in JS without having to communicate with the server.\nWith that being said, it's absolutely possible to just combine two approaches. But it requires a deeper understanding of Bokeh's architecture and models.","Q_Score":0,"Tags":"python,bokeh","A_Id":62298955,"CreationDate":"2020-06-10T06:00:00.000","Title":"Is there any difference between Bokeh server and Bokeh JS in terms of speed?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I wanted to ask if it is possible to add more integerfields and charfields to a model if it has already been migrated to an SQLite database.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":27,"Q_Id":62299206,"Users Score":0,"Answer":"Yes after every new addition\/deletion of fields to\/from your model you need to do makemigrations and migrate and Django will modify your sqlite database accordingly.\nIf there is existing data and you add a new field, it has to be either nullable or you need to provide a sensible default for existing data for that new column.\nIf you remove a field, that field will be removed but your data will remain intact without the removed column.","Q_Score":0,"Tags":"python,django","A_Id":62299258,"CreationDate":"2020-06-10T08:34:00.000","Title":"Is it possible to create more Data Fields after Migrations have taken place?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I know it might be a bad design but since we are developing the django website on our laptops which runs Win7, I thought it would be better to run django on a Windows platform only in production.\n(Laptop is not powerful enough to run a Unix VM inside and our Unix team doesn't provide any Unix server with UI access (Only Putty) so using an IDE is impossible on Unix.)\nI have deployed django with gunicorn and nginx on a Linux server very easily, but this time I have to deploy django on a Windows server with Apache on another Unix server (I know it sucks).\nOur middleware team is asking(forcing) to run django components on a separate server so that they can manage their Apache (on Unix) instance comfortably. As far as I understand, Apache and django should reside on the same server for mod_wsgi to work.\nIs this possible to keep Apache on a Unix machine and make a django website run from a Windows machine?\nIf not, what are the best possible solutions in my case? (Switch django on Unix? Use waitress on Django windows? Do not separate Apache and Django? etc.)\nRegards,\nAditya","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":295,"Q_Id":62299359,"Users Score":0,"Answer":"The best thing in my modest point of view is to create a unix docker image of your project","Q_Score":1,"Tags":"python,django,windows,apache,waitress","A_Id":62312129,"CreationDate":"2020-06-10T08:43:00.000","Title":"Deploying django(windows) with apache(on unix)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I am making a CRM web application. I am planning to do its backend in python(because I only know that language better) and I have a friend who uses flutter for frontend. Is it possible to link these two things(flutter and python backend)? If yes how can it be done...and if no what are the alternatives I have?","AnswerCount":3,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":1054,"Q_Id":62306900,"Users Score":0,"Answer":"I used  $.ajax() method in HTML pages and then used request.POST['variable_name_used_in_ajax()'] in the views.py","Q_Score":0,"Tags":"python,flutter,flutter-web","A_Id":63479644,"CreationDate":"2020-06-10T15:08:00.000","Title":"linking web application's backend in python and frontend in flutter","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am making a CRM web application. I am planning to do its backend in python(because I only know that language better) and I have a friend who uses flutter for frontend. Is it possible to link these two things(flutter and python backend)? If yes how can it be done...and if no what are the alternatives I have?","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1054,"Q_Id":62306900,"Users Score":0,"Answer":"Yes you both can access same Django rest framework Backend. Try searching for rest API using Django rest framework and you are good to go.\nOther alternatives are Firebase or creating rest API with PHP.\nYou would need to define API endpoints for different functions of your app like login,register etc.\nDjango rest framework works well with Flutter. I have tried it. You could also host it in Heroku\nUse http package in flutter to communicate with the Django server.","Q_Score":0,"Tags":"python,flutter,flutter-web","A_Id":62307029,"CreationDate":"2020-06-10T15:08:00.000","Title":"linking web application's backend in python and frontend in flutter","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In the xgboost documentation they refer to a copy() method, but I can't figure out how to use it since if foo is my model, neither bar = foo.copy() nor bar=xgb.copy(foo) works (xgboost can't find a copy() attribute of either the module or the model). Any suggestions?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":885,"Q_Id":62309466,"Users Score":1,"Answer":"It turns out that copy() is a method of the Booster object, but a (say) XGBClassifier is not one, so if using the sklearn front end, you do\nbar = foo.get_booster().copy()","Q_Score":2,"Tags":"python,xgboost","A_Id":62316164,"CreationDate":"2020-06-10T17:22:00.000","Title":"xgboost how to copy model","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm having some trouble hosting a django API on a separate server. When using localhost everything works, however when I log in to the server admin panel I get an \"invalid salt\" error.\nOriginally, I had my own login method that used bcrypt, but I decided to scrap that in favor of using facebook authentication. I've removed all references to bcrypt from my views. The problem lies with the built in admin interface. I haven't modified the code for that at all, but I am unable to log in. I can share my code, but I'm not even sure what files would be relevant to share, so I'm happy to update as needed.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":47,"Q_Id":62309930,"Users Score":0,"Answer":"Turns out this wasn't a code problem, it was a dependency problem. I had py-bcrypt installed on the server, but not bcrypt. It seems both libraries are necessary for the admin feature to work. I probably should have dockerized it.","Q_Score":0,"Tags":"python,django,bcrypt","A_Id":62310214,"CreationDate":"2020-06-10T17:49:00.000","Title":"Invalid salt when logging in via django admin panel","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to Django, and the tutorial directly applied this command without explanation.\nAfter searching, I found out it's calling migrations in Django, but didn't understand it either as I am a complete newbie at this.\nWhat does the python manage.py migrate command do exactly?\nWhat are migrations?","AnswerCount":1,"Available Count":1,"Score":0.6640367703,"is_accepted":false,"ViewCount":1266,"Q_Id":62311073,"Users Score":4,"Answer":"If your database doesn't exist yet, migrate creates all the necessary tables to match your model definitions.\nOtherwise if the database already exists, migrate brings the existing table definitions to be in sync with the model definitions -- i.e. maybe you added a field to one of your models, so migrate would add that column to the database table.","Q_Score":2,"Tags":"python,django,python-3.x","A_Id":62311166,"CreationDate":"2020-06-10T18:54:00.000","Title":"what does \" python manage.py migrate \" in django do exactly?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I got 6 real-time videos which are inference output from heavy deep learning calculation from python, and I've tried to display them to PyQt that lots of threading issues with ugly GUI!!. So, I want to use a framework only to display well and fancy GUI! There seem lots of frameworks based on my google search, and I have no idea \nwhich one is the best for my current project among Node js, Django, and Flask!\n\nI need to display 6 real-time videos with 10~15 FPS.\nCommunicating well with python.\nEasy to build GUI, I have some features like logging, displaying real-time graph(optional)","AnswerCount":3,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":1083,"Q_Id":62315216,"Users Score":3,"Answer":"For video streaming, you will require to setup a socket URL for listening to incoming packet. Definitely, you can dedicate a server just for this to handle high amount of traffic.\nNow, as such it dependents on your application, if you are just going to use it for streaming then Flask will do, it is lightweight. On the other hand, Django and NodeJS provides ready made function for socket programming and they are very useful.","Q_Score":1,"Tags":"python,node.js,django,opencv,flask","A_Id":62315330,"CreationDate":"2020-06-11T00:26:00.000","Title":"Node js vs Django vs Flask for multiple videos streaming from python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I got 6 real-time videos which are inference output from heavy deep learning calculation from python, and I've tried to display them to PyQt that lots of threading issues with ugly GUI!!. So, I want to use a framework only to display well and fancy GUI! There seem lots of frameworks based on my google search, and I have no idea \nwhich one is the best for my current project among Node js, Django, and Flask!\n\nI need to display 6 real-time videos with 10~15 FPS.\nCommunicating well with python.\nEasy to build GUI, I have some features like logging, displaying real-time graph(optional)","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":1083,"Q_Id":62315216,"Users Score":0,"Answer":"I would say it doesn't really matter much as Django would be good because of its  pre built features... Plus data transfer is very reliable in django along with your expertise in python, django is preferred. NodeJs would be easier to implement tho. Really prefers upon you, but both django and nodeJs works pretty well.\nSorry, no idea on flask","Q_Score":1,"Tags":"python,node.js,django,opencv,flask","A_Id":63781694,"CreationDate":"2020-06-11T00:26:00.000","Title":"Node js vs Django vs Flask for multiple videos streaming from python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a flask app that is intended to be hosted on multiple host. That is, the same app is running on different hosts. Each host can then send a request to the others host to take some action on the it's respective system. \nFor example, assume that there is systems A and B both running this flask app. A knows the IP address of B and the port number that the app is hosted on B. A gets a request via a POST intended for B. A then needs to forward this request to B. \nI have the forwarding being done in a route that simply checks the JSON attached to the POST to see if it is the intended host. If not is uses python's requests library to make a POST request to the other host. \nMy issue is how do I simulate this environment (two different instance of the same app with different ports) in a python unittest so I can confirm that the forwarding is done correctly?\nRight now I am using the app.test_client() to test most of the routes but as far as I can tell the app.test_client() does not contain a port number or IP address associated with it. So having the app POST to another app.test_client() seems unlikely. \nI tried hosting the apps in different threads but there does not seem to be a clean and easy way to kill the thread once app.run() starts, can't join as app.run() never exits. In addition, the internal state of the app (app.config) would be hidden. This makes verifying that A does not do the request and B does hard. \nIs there any way to run two flask app simultaneously on different port numbers and still get access to both app's app.config? Or am I stuck using the threads and finding some other way to make sure A does not execute the request and B does? \nNote: these app do not have any forums so there is no CSRF.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":95,"Q_Id":62328279,"Users Score":0,"Answer":"I ended up doing two things. One, I started using patch decorator from the mock library to fake the response form systems B. More specifically I use the @patch('requests.post') then in my code I set the return value to \"< Response [200]>\". However this only makes sure that requests.post is called, not that the second system processed it correctly. The second thing I did was write a separate test that makes the request that should have been sent by A and sends it to the system to check if it processes it correctly. In this manner systems A and B are never running at the same time. Instead the tests just fake there responses\/requests.  \nIn summery, I needed to use @patch('requests.post') to fake the reply from B saying it got the request. Then, in a different test, I set up B and made a request to it.","Q_Score":0,"Tags":"python,flask,python-requests,python-unittest","A_Id":62338499,"CreationDate":"2020-06-11T15:48:00.000","Title":"Test interaction between flask apps","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I made a website in node.js and I have used child process to run python scripts and use their results in my website. But when I host my application on heroku, heroku is unable to run the python scripts. \nI have noticed that heroku was able to run python scripts which only had inbuilt python packages like sys, json but it was failing for scripts which were using external packages like requests, beautifulsoup.\nAttempt-1\nI made a requirements.txt file inside the project folder and pushed my code to heroku again. But it was still not working. I noticed that heroku uses the requirements.txt file only for python based web applications but not for node.js applications. \nAttempt-2\nI made a python virtual env inside the project folder and imported the required python packages into the venv. I then removed gitignore from the venv and pushed the whole venv folder to heroku. It still didn't work.\nPlease let me know if anyone came across a way to handle this.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":423,"Q_Id":62338454,"Users Score":0,"Answer":"Solution:\nHave a requirements.txt file in your project folder. \nAfter you create a heroku app using \"heroku create\", heroku will identify your app as python based and will not download any of the node dependencies. \nNow, go to your heroku profile and go to your app's settings. There is an option named \"Add Buildpack\" in there. Click on that and add node.js as one of the buildpacks.\nGo back to your project and push it to heroku. This time heroku will identify your app as both python and node.js based and will download all the required files.","Q_Score":0,"Tags":"python,node.js,heroku,web-applications","A_Id":62344858,"CreationDate":"2020-06-12T06:05:00.000","Title":"Heroku not working for Node.js file with python scripts","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I would like to create a price table by date, I tried to google this for python and django, but still have no idea for this. I don't want to create one to one relationship object like an options. but I would like to create the database associating date and price. Sorry that it may be simple question..\nWould it be solution to create a database by using PostgreSQL, and read by django? or any resource \/ reference can help get me in right direction to access this problem? \nThanks so much","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":84,"Q_Id":62341966,"Users Score":0,"Answer":"Well there is more to it then assigning a price to a date. You will need one or more tables that hold the establishment(hotels) data. These would include the room information as all rooms will not have the same price. Also the price will probably change over time, so you will need to track that. Then there is the reservation information to track. This is just some of the basics. It is not a simple task by any means. I would try a simpler project to start with to learn Django and how to get data in and out of it.","Q_Score":0,"Tags":"python,django,database,postgresql","A_Id":62349333,"CreationDate":"2020-06-12T10:06:00.000","Title":"Any idea to create the price table which associate with date in Django(Python)","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was doing some project by using django\nand I realized that I forgot to activate virtualenv.\nI already made some changes and applied it not on the venv,\nand created superuser on the system.\n\nHow to find any changes on the system?\nhow to remove superuser that I made on the system\nand what are the cmd commands for that?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":629,"Q_Id":62351016,"Users Score":0,"Answer":"If you haven't setup an additional database for your project and you have used django-admin startproject you'll just have a standard django setup, and you will be using sqlite. With this setup, your database is stored in a file in your root directory (for the project) called db.sqlite3.\nThis is where the super-user you have created will be stored. So it does not matter if the virtualenv was activated or not. Your superuser will have been created in the right place. \nTLDR: No need to worry, the superuser you created will most likely be in the right place.","Q_Score":0,"Tags":"python,django,virtualenv","A_Id":62352165,"CreationDate":"2020-06-12T19:17:00.000","Title":"How to remove superuser on the system in Django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Stuck on a single step and doc searching isn't helping...\nIn Connect I have:\n\nStore customer input : \"What's your age?\"\nSet contact attribute: age -> system -> stored customer input\n\nI know the above works because I've had a Play Prompt read back the attribute. \nI want Lambda to handle somethings with the age. I setup a function, I attached it to the Connect instance. I added it to the flow with a simple value pair response and that works (the Play Prompt plays back the non-dynamic response from Lambda).\nWhen I try to make it dynamic breaks.\nMy understanding is that I should be able to get to this attribute in Lambda by using the passed JSON.... so I'm doing this:\nage = event[\"Details\"][\"ContactData\"][\"Attributes\"][\"age\"]\nConnect starts saying it has trouble accessing the attribute and ends the call. What am I doing wrong? The rest of the Python code is fine because if I hard set age (age = 24) the code runs fine.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":175,"Q_Id":62363320,"Users Score":0,"Answer":"There was nothing wrong my code as it pertains to the lambda \/ connect integration... it was with something that was just causing an error. I started monitoring the function in cloudwatch and that helped!","Q_Score":0,"Tags":"python-3.x,amazon-web-services,aws-lambda","A_Id":62411434,"CreationDate":"2020-06-13T17:22:00.000","Title":"Passing attribute from AWS Connect to Lambda using Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I use Heroku to host my discord.py bot, and since I've started using sublime merge to push to GitHub (I use Heroku GitHub for it), Heroku hasn't been running the latest file. The newest release is on GitHub, but Heroku runs an older version. I don't think it's anything to do with sublime merge, but it might be. I've already tried making a new application, but same problem. Anyone know how to fix this?\nEdit: I also tried running Heroku bash and running the python file again","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":43,"Q_Id":62368748,"Users Score":1,"Answer":"1) Try to deploy branch (maybe another branch)\n2) Enable automatic deploy","Q_Score":1,"Tags":"python,heroku","A_Id":62368911,"CreationDate":"2020-06-14T05:35:00.000","Title":"Heroku won't run latest python file","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new with Angular and have no idea what I am supposed to do to resolve this problem. In my code, there is an HTML 5 video tag and a button. when the button is clicked, a python code is supposed to perform an operation on live video and stream it to the web API that I am supposed to develop. This streamed video is to be shown through the video tags.\nI must use angular for the front-end and I am supposed to tell the python developer what I need from him. If video tags are not right way of doing this, I could change that. For reference, I have posted my HTML code here. Also, the button click must pass an integer value to the python code, which I am assuming would be by calling a function with an argument. Please guide.\n`Start\n \n`","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":115,"Q_Id":62374965,"Users Score":0,"Answer":"I have done similar things by using this, but in vanilla javascript. When the button is clicked my index function in python Flask get executed.\n<button type=\"button\" class=\"btn btn-primary\" onclick=\"window.location.href='\/'\">Home<\/button>","Q_Score":0,"Tags":"python,angular,video-streaming,integration","A_Id":62375081,"CreationDate":"2020-06-14T16:00:00.000","Title":"Calling Python function from angular button and displaying output video in video tag","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to append something on entity while it exists and do not append the entity if it doesn't exist. How will I be able to achieve it? I tried following but it doesn't work the way I want.\ntask = table_service.get_entity('datas', '..com','asss','Hello')\ntable_service.insert_or_replace_entity('tasktable', task)\nIf the entity exists :\nI want to append that hello with something as:\n('datas', '..com','asss','Hello;123')\nIf the entity doesnt exist :\nI want to insert as:\n('datas', '..com','asss','Hello')","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":211,"Q_Id":62375424,"Users Score":0,"Answer":"If you want to append something to one existing entity property's value, it is impossible. Because Azure table storage does not provide any operation to do that.  Azure Table storage just provides operations to manage entity and it does not provide operations to manage Azure table entity properties. So you just can set a new value for one existing entity property. \nRegarding how to do that, we can use update or merge operation. But please note that the two operations will cause  different result. The update operation replaces the entire entity. Those properties from the previous entity will be removed if the request does not define or include them. The merge operation does not replace the existing entity. Those properties from the previous entity will be retained if the request does not define or include them.","Q_Score":0,"Tags":"python-3.x,azure,azure-cosmosdb,azure-table-storage","A_Id":62441229,"CreationDate":"2020-06-14T16:39:00.000","Title":"Append Entity on Microsoft Azure Table Storage Insert or Replace","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I want my flask server to do a certain task when its idle for some time lets say 5 mins, i.e after 5 mins it will do another job. For this i need something to check if a server is busy or idle. How can I achieve this?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":429,"Q_Id":62380710,"Users Score":0,"Answer":"You can save the current datetime in a variable everytime a request is made via the @app.after_request annotation.\nThen you need a routine to periodically check if the time difference between now and the saved timestamp is greater than 5 miutes. If so then run your task.\nFor executing your check every 5 minutes you may need some kind of scheduler which will be started with your application.","Q_Score":0,"Tags":"python,flask","A_Id":62388338,"CreationDate":"2020-06-15T03:04:00.000","Title":"Checking if a flask server is busy or idle","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm a beginner to Django and Python, and I've never used virtualenv before. However, I do know the exact commands to activate and deactivate virtual environments (online search). However, this learning course takes time and sometimes I need to split the work over 2 days.\nWhen I create a virtualenv today and do some work, I'm unable to access the same virtualenv tomorrow. Even when I navigate to that folder and type in .\\venv\\Scripts\\activate, it says \"system cannot find specific path\".\nHow can I open already existing virtual environments and the projects within them? Could it be that I need to end my previous session in a certain way for me to access it the next time?","AnswerCount":3,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":3645,"Q_Id":62383619,"Users Score":0,"Answer":"Open the command prompt\nGo to the project directory, where you created virtual environment\nAnd type the same as error shows, as in my  case it was\n\nFile D:\\Coding files\\Python*recommendation-system\\venv\\Scripts\\activate.ps1* cannot be loaded because running scripts is disabled on this system.\n\nSo I typed recommendation-system\\venv\\Scripts\\activate.ps1\n\nAnd it resolved my problem.","Q_Score":0,"Tags":"python,django,windows,cmd","A_Id":72240811,"CreationDate":"2020-06-15T07:45:00.000","Title":"How to activate an existing virtualenv projects?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm a beginner to Django and Python, and I've never used virtualenv before. However, I do know the exact commands to activate and deactivate virtual environments (online search). However, this learning course takes time and sometimes I need to split the work over 2 days.\nWhen I create a virtualenv today and do some work, I'm unable to access the same virtualenv tomorrow. Even when I navigate to that folder and type in .\\venv\\Scripts\\activate, it says \"system cannot find specific path\".\nHow can I open already existing virtual environments and the projects within them? Could it be that I need to end my previous session in a certain way for me to access it the next time?","AnswerCount":3,"Available Count":2,"Score":-0.0665680765,"is_accepted":false,"ViewCount":3645,"Q_Id":62383619,"Users Score":-1,"Answer":"Open your Windows Command Prompt.\n\nGo to your project directory, where you created your virtual environment for this project.\n\nrun this command->  .\\env_name\\Scripts\\activate","Q_Score":0,"Tags":"python,django,windows,cmd","A_Id":66047853,"CreationDate":"2020-06-15T07:45:00.000","Title":"How to activate an existing virtualenv projects?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Good day, \nI am trying to stick footer to bottom django template layout, flex box and grid doesn`t help. May be in Django template another way?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":161,"Q_Id":62388787,"Users Score":1,"Answer":"Consider using position: fixed in CSS","Q_Score":0,"Tags":"python,css,django,templates","A_Id":62405145,"CreationDate":"2020-06-15T13:02:00.000","Title":"stick footer to bottom django template","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am running a python script on Heroku which runs every 10 minutes using the Heroku-Scheduler add-on.  The script needs to be able to access the last time it was run.  On my local machine I simply used a .txt file which I had update whenever the program was run with the \"last run time\".  The issue is that Heroku doesn't save any file changes when a program is run so the file doesn't update on Heroku.  I have looked into alternatives like Amazon S3 and Postgresql, but these seem like major overkill for storing one line of text.  Are there any simpler alternatives out there?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":48,"Q_Id":62394659,"Users Score":0,"Answer":"If anyone has a similar problem, I ended up finding out about Heroku-redis which allows you to make key-value pairs and then access them. (Like a Cloud Based Python Dictionary)","Q_Score":0,"Tags":"python,heroku,amazon-s3,heroku-postgres","A_Id":62411106,"CreationDate":"2020-06-15T18:28:00.000","Title":"Way to store a single line of changing text on Heroku","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Flask web app written in Python3. The issue I have though is, that all the variables are always shared between all users that access my website. \nFor example, if user1 during his time on my website clicks a button which in Python3 does var1 = \"aaa\" and then populates this variable into an HTML input field, then all of the other users accessing the website will see the input field with value aaa. \nI'm using gunicorn3 as my WSGI. I have also tried to gunicorn3 python-docx:app -k gevent --worker-connections 1000 but that didn't help at all.\n(python-docx is the name of my Python3 file)\nHow can I make sure, that the variables in my Python code are NOT shared between each sessions of different users? I want to make sure, that only the variables and their values are visible to each user specifically, not have them shared like now. \nIs it possible?\nThank you very much.\nEdit: I do not use database nor do I use a login system for my web app. My web app is public without any user management so anyone can use the web app's functionality for free.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":302,"Q_Id":62404389,"Users Score":0,"Answer":"The Issue is solved partially if you can identify Users(differentiate requests)\nI know you are not using any authentication, so instead you can use timestamp when user requests the page capture the time stamp for that user in dictionary\nInstead of using var1=\"aaa\"\nuse: dict['fixed_request_time_stamp']={var1:\"aaa\"}\nSo when user request page, a unique time_stamp will created and sent to user along with page, that will submitted back to server when user submit form along with data(\"aaa\") (\"timestamp\")","Q_Score":0,"Tags":"html,python-3.x,web,flask,gunicorn","A_Id":68587904,"CreationDate":"2020-06-16T08:39:00.000","Title":"Python Flask - web app to NOT share variables between multiple users","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"The situation is:\nI developped a webapp using django (and especially \"django-simple-history\").\nI have a postgres database \"db01\" with a history model \"db01_history\" which is generated\/filled using \"django-simple-history\".\nI accidentally deleted everything from \"db01\"and, sadly, I don't have any db backup.\nMy question is:\nIs there some way to replay all historical records \"db01_history\" (up to a specific ID) onto original database \"db01\" ?\n(In other words, is there a way to restore a db using its historical model up to a specific date\/ID ?)\nGiving db0_history -> db01","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":242,"Q_Id":62436082,"Users Score":1,"Answer":"Fortunately, django-simple-history keeps using your own model's field names and types (but does not keep some constraints). \nThe difference is that there are multiple historical objects for each of your deleted objects. If you use Django default primary key (id) it would be easy for you to group your tables by id and use the latest record as of history_date (the time of recorded history).\nAn exception is that if you use more direct database operations like updates or bulk_creates from model managers you don't have their histories.\nSo you can just configure your project to use a copy of the historical database only having the latest record for each object and then try to do python manage.py dumpdata > dump.json and then revert the database settings to the new database you like and do python manage.py loaddata dump.json.\nTo be concise, yes you may have all your data in your historical database.","Q_Score":0,"Tags":"python,django,database,postgresql,django-models","A_Id":62436912,"CreationDate":"2020-06-17T18:37:00.000","Title":"Is it possible to replay django-simple-history up to a specific ID to restore a delete database?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using selenium python and was wondering how one effectively scrapes over 50,000 data points in under 24 hours. For example, when I search for products on the webpage 'insight.com' it takes about 3.5 seconds for the scraper to search for the product and grab its price, meaning that with large amounts of data it takes the scraper several days. A part from using threads to simultaneously look up several products at the same time, how else can I speed up this process?\nI only have one laptop and will have to simultaneously scrape six other similar websites so therefore do not want too many threads and the speed at which the computer operates will slow down significantly.\nHow do people achieve to scrape large amounts of data in such short periods of time?","AnswerCount":2,"Available Count":2,"Score":0.1973753202,"is_accepted":false,"ViewCount":130,"Q_Id":62438727,"Users Score":2,"Answer":"If you stop using the selenium module, and rather work with a much more sleek and elegant module, like requests, you could get the job done in a matter of mere minutes.\nIf you manage to reverse engineer the requests being handled, and send them yourself, you could pair this with threading to scrape at some 50 'data points' per second, more or less (depending on some factors, like processing and internet connection speed).","Q_Score":2,"Tags":"python,selenium,web-scraping","A_Id":62438810,"CreationDate":"2020-06-17T21:33:00.000","Title":"How to scrape over 50,000 data points from dynamically loading webpage in under 24 hours?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using selenium python and was wondering how one effectively scrapes over 50,000 data points in under 24 hours. For example, when I search for products on the webpage 'insight.com' it takes about 3.5 seconds for the scraper to search for the product and grab its price, meaning that with large amounts of data it takes the scraper several days. A part from using threads to simultaneously look up several products at the same time, how else can I speed up this process?\nI only have one laptop and will have to simultaneously scrape six other similar websites so therefore do not want too many threads and the speed at which the computer operates will slow down significantly.\nHow do people achieve to scrape large amounts of data in such short periods of time?","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":130,"Q_Id":62438727,"Users Score":1,"Answer":"Find an API and use that!!!  The goal of both web scraping and APIs is to access web data.\nWeb scraping allows you to extract data from any website through the use of web scraping software. On the other hand, APIs give you direct access to the data you\u2019d want.\nAs a result, you might find yourself in a scenario where there might not be an API to access the data you want, or the access to the API might be too limited or expensive.\nIn these scenarios, web scraping would allow you to access the data as long as it is available on a website.\nFor example, you could use a web scraper to extract product data information from Amazon since they do not provide an API for you to access this data.  However, if you had access to an API, you could grab all the data you want, super, super, super fast!!!  It's analogous to doing a query in a database on prem, which is very fast and very efficient, vs. refreshing a webpage, waiting for ALL elements to load, and you can't use the data until all elements have been loaded, and then.....do what you need to do.","Q_Score":2,"Tags":"python,selenium,web-scraping","A_Id":63663707,"CreationDate":"2020-06-17T21:33:00.000","Title":"How to scrape over 50,000 data points from dynamically loading webpage in under 24 hours?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm having trouble doing this and can't find a good way to select them all. I need to get the live updates as well as the normal headlines. Basically every bolded headline on the site. Also, I need to get the embedded link that activates when these are clicked. I have some basic knowledge of HTML and have webscraped a few things before, but am struggling with this for some reason. Can someone walk me through it?\nUpon further inspection, it seems I might want to find the children of all article classes?","AnswerCount":2,"Available Count":1,"Score":-0.0996679946,"is_accepted":false,"ViewCount":59,"Q_Id":62438887,"Users Score":-1,"Answer":"You could use the requests module to download the page's HTML code, then parse it by h3 tags, which I've noticed are used for headlines.\nYou can then use the .find(string) method to find such HTML tag, and when you do, find the next instance of <\/h3> from that index of the HTML code onward.\nI couldn't understand which and how many headlines you want to parse, but you can use a while loop to keep parsing for every h3 tag on the page, until you can't find a new one (the .find() method should return -1 if it doesn't locate the string).","Q_Score":1,"Tags":"python,web-scraping,beautifulsoup","A_Id":62439089,"CreationDate":"2020-06-17T21:46:00.000","Title":"Getting the headlines and headline links from NPR.org with Beautiful Soup","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm developing a Flask app using flask-socketio, running it with socketio.run(app, debug=True), but every time I update any of the app's Javascript code and then refresh the browser, the changes do not take effect. If I update any of the Python code and then refresh, the Python changes do take effect - the only problem is with Javascript changes. \nClearing my browser's data resolves the issue, but I don't want to have to do that every time I make changes to my JS code. Is there another way?","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":272,"Q_Id":62439187,"Users Score":1,"Answer":"Try ctrl-clicking (or shift-clicking) the refresh button.\nWhat is likely happening is that the browser is \"caching\" your Javascript code. Clearing your browser's data clears the cache, and you get the newest updates...\nIn some browsers, you can avoid doing that by refreshing the page in a way that bypasses the cache. I think the shift-click trick works in Firefox, and ctrl-click is Chrome. Or, look up \"bypass cache refresh [browser_name]\".","Q_Score":1,"Tags":"javascript,python,flask,socket.io,flask-socketio","A_Id":62439345,"CreationDate":"2020-06-17T22:10:00.000","Title":"How to get Flask app to refresh after updating JS code without having to clear browsing data","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm developing a Flask app using flask-socketio, running it with socketio.run(app, debug=True), but every time I update any of the app's Javascript code and then refresh the browser, the changes do not take effect. If I update any of the Python code and then refresh, the Python changes do take effect - the only problem is with Javascript changes. \nClearing my browser's data resolves the issue, but I don't want to have to do that every time I make changes to my JS code. Is there another way?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":272,"Q_Id":62439187,"Users Score":0,"Answer":"If clearing cache does work, then another method (which I always use) is to keep your developer tools opened and make sure you've checked \"Disable cache\" in the network tab.\nThe \"Disable cache\" feature only works when developer tools is opened as I said.","Q_Score":1,"Tags":"javascript,python,flask,socket.io,flask-socketio","A_Id":62439367,"CreationDate":"2020-06-17T22:10:00.000","Title":"How to get Flask app to refresh after updating JS code without having to clear browsing data","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to Django. How do Pipefiles and Pipefile.lock files get created? \nI created them earlier, but I'm not sure what I did.\nThank you","AnswerCount":3,"Available Count":2,"Score":0.0665680765,"is_accepted":false,"ViewCount":796,"Q_Id":62440310,"Users Score":1,"Answer":"When you install Django in a new directory with \"pipenv install django\" you create two files in your new virtual environment and these files are Pipfile and Pipfile.lock\nHope this helps!","Q_Score":0,"Tags":"python-3.x,django","A_Id":62440400,"CreationDate":"2020-06-18T00:11:00.000","Title":"Django How to Create the Pip and Piplock file?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to Django. How do Pipefiles and Pipefile.lock files get created? \nI created them earlier, but I'm not sure what I did.\nThank you","AnswerCount":3,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":796,"Q_Id":62440310,"Users Score":0,"Answer":"Ah, figured it out, I needed to type python manage.py startapp name_of_app\nApp has already been created, how can I create the files mid app development?","Q_Score":0,"Tags":"python-3.x,django","A_Id":62440395,"CreationDate":"2020-06-18T00:11:00.000","Title":"Django How to Create the Pip and Piplock file?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Is there some sort of bug when you use createsuperuser in Django?\nI am literally typing the following: python manage.py createsuperuser.\nHere is what happens:\n1) The first time I type this, it will say \n\nUsername (leave blank to use 'whatever')\n\n: so I typed 'batman'\nIt then says \n\n'batman' is not recognized as an internal or external command,\n  operable program or batch file.\n\nWhen I retype python manage.py createsuperuser, it accepts my answer of batman.\nI am on a Windows machine, has anyone seen this before?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":109,"Q_Id":62440620,"Users Score":1,"Answer":"don't use inverted comma(')\ntry this:\n\nUsername (leave blank to use 'whatever'):hello","Q_Score":0,"Tags":"python,python-3.x,django","A_Id":62449353,"CreationDate":"2020-06-18T00:51:00.000","Title":"Django Createsuperuser Bug?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I now have an HTML file and I want to send it as a table, not an attachment by using outlook. The code that I found online only sends the file as an attachment. Can anyone give me ideas on how to do it properly?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":33,"Q_Id":62442067,"Users Score":0,"Answer":"You can use the HTMLBody property of the MailItem class to set up the message body.","Q_Score":0,"Tags":"python,html,email,outlook","A_Id":62479266,"CreationDate":"2020-06-18T03:50:00.000","Title":"How to send a HTML file as a table through outlook?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am running a Flask API application, and I have an SSL Certificate.\nWhen I run flask server on localhost the certificate is applied from Flask successfully.\nBut when I use Ngrok to deploy the localhost on a custom domain, the certificate is changed to *.ngrok.com, how can I change that to my certificate?.\nEDIT #1:\nI already have a certificate for the new hostname and I have already applied it on Flask, but ngrok is changing it.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1392,"Q_Id":62449887,"Users Score":0,"Answer":"You expose your service through the URL *.ngrok.com. A browser or other client will make a request to *.ngrok.com. The certificate presented there must be valid for *.ngrok.com. If *.ngrok.com presents a certificate for example.com, any valid HTTPS client would reject it because the names do not match, which by definition makes it an invalid certificate and is a flag for a potential security problem, exactly what HTTPS is designed to mitigate.\nIf you want to present your certificate for example.com to the client, you need to actually host your site at example.com","Q_Score":0,"Tags":"python,ngrok,pyngrok","A_Id":62450179,"CreationDate":"2020-06-18T12:22:00.000","Title":"Ngrok hostname SSL Certificate","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I cannot access my Django app on an EC2 instance (host2) in my browser by typing its public DNS name with port number: ec2-public-dns-of-this-instance.compute-1.amazonaws.com:8000\n\nI'm using the same Security Group that my other EC2 instance (host1) is using which is working just fine (my other Django app hosted on this instance works perfectly fine), with HTTP\/TCP open on 0.0.0.0\/0 on port 8000\nI started my Django project this way: .\/manage.py runserver 0.0.0.0:8000\nI've added hosts into my ALLOWED_HOSTS file which has these now: ALLOWED_HOSTS = ['*', '127.0.0.1', 'ec2-public-dns-of-this-instance.compute-1.amazonaws.com', '0.0.0.0', 'localhost']\nI was able to curl localhost:8000 which returned me 200 and Django default HTML page when I'm ssh'ed into this instance.\nI was able to curl ec2-public-dns-of-this-instance.compute-1.amazonaws.com:8000 which also returned me 200 and Django default HTML page when I'm ssh'ed into this instance.\nboth host1 and host2 are using the exactly the same subnet, VPC, SG, AMI, in the same AZ.\nboth host1 and host2 are running on AMI Ubuntu 18.04 LTS\n\nAny ideas how to fix this would be greatly appreciated!","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":740,"Q_Id":62458709,"Users Score":2,"Answer":"Interestingly, it started working three hours later.\nI didn't change anything and all things remain the same as I described above.\nI have no clue why this is the case...","Q_Score":3,"Tags":"python,django,amazon-web-services,amazon-ec2,aws-security-group","A_Id":62463395,"CreationDate":"2020-06-18T20:18:00.000","Title":"Cannot access my Django page hosted on AWS EC2 instance","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Is it possible to deploy react front end app and Django as back end app on pythonanyhere.com?\nI have django API as back end and React as Front app.","AnswerCount":1,"Available Count":1,"Score":0.6640367703,"is_accepted":false,"ViewCount":1183,"Q_Id":62467086,"Users Score":4,"Answer":"Yes, it is. React is just Javascript, so as long as you are serving your react code and loading it into your Django pages, it will just work.","Q_Score":3,"Tags":"django,reactjs,pythonanywhere","A_Id":62470522,"CreationDate":"2020-06-19T09:18:00.000","Title":"Possible to have react + Django on pythonanywhere.com","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"i am trying to develop a web application using HTML, PHP, and java script and i will include the Traveling salesman problem. should i use python for implementation or stick to java script? and what is the difference between them? which one is less complicated?","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":450,"Q_Id":62476487,"Users Score":0,"Answer":"Adding additional languages to your application adds more complexity to your project. You already have two programming languages and a markup language in your project. Use javascript if you want to solve the problem on the client, or use php if you want to solve the problem on the server. If python is your language of choice, you can serve webpages from a python framework like flask instead of apache\/php.","Q_Score":0,"Tags":"javascript,python,html,algorithm,traveling-salesman","A_Id":62476679,"CreationDate":"2020-06-19T18:30:00.000","Title":"Traveling Salesman Problem implementation language","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to search for an element in an android application page which has a count down animation, so the searching for the element does not finish until the count down ends.\nIs there any way Appium does not wait and return immediate results?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":92,"Q_Id":62479426,"Users Score":0,"Answer":"Use threading while the one counts down other can help with the search and when the countdown ends the other thread can kill the searching thread.","Q_Score":2,"Tags":"appium,appium-android,python-appium","A_Id":62792815,"CreationDate":"2020-06-19T22:31:00.000","Title":"Search for an element immediately","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to implement a private field feature using django.I saved the private fields in django MutliSelectField.After this is done  now a differnt API is used to fetch the data.Before sending the response I need to eliminate the fields specified in MultiSelectField.In the serializer we can use create and update method for modifying the results of a POST, PUT and PATCH requests. Similarly is there any method that I can override so as to remove the items specified in the django MultiSelectField.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":63,"Q_Id":62484127,"Users Score":0,"Answer":"I found the way to achieve it. In the serializer there is a method called to_representation. overriding it gives the ability to modify the response data just before it is sent.","Q_Score":0,"Tags":"python-3.x,django,django-rest-framework","A_Id":62485079,"CreationDate":"2020-06-20T09:41:00.000","Title":"Modifying the GET request response in django rest framework","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to write a script to automate a task I'd need to do. So I need this script to check if python is on the \/login page and if he is, to enter the username and password for logging in.\nFor username when logging in, in HTML, it is an input type=\"text\" name=\"username\" and for the password it is an input type=\"password\" name=\"password\". I did search and saw that I should use requests but I only saw them executing POST methods and I'm not sure if this is the case here as well.","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":169,"Q_Id":62487636,"Users Score":1,"Answer":"I'd suggest considering using selenium Framework","Q_Score":0,"Tags":"python,python-3.x,python-requests","A_Id":62487663,"CreationDate":"2020-06-20T15:14:00.000","Title":"Python script to enter data in website inputs","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to write a script to automate a task I'd need to do. So I need this script to check if python is on the \/login page and if he is, to enter the username and password for logging in.\nFor username when logging in, in HTML, it is an input type=\"text\" name=\"username\" and for the password it is an input type=\"password\" name=\"password\". I did search and saw that I should use requests but I only saw them executing POST methods and I'm not sure if this is the case here as well.","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":169,"Q_Id":62487636,"Users Score":1,"Answer":"Yes selenium works well for this, just to give you some hints. I've done this type of program in the past:\nselenium allows you to click on buttons on a website (you can use this to navigate to the login page).\nThen it allows you to enter data into text fields (this is using a .send_keys() function which you will use to input your name\/password).\nLastly, to actually login you can use the click() function to click on the login button or use send_keys() to \"click\" enter on the keyboard.\nOnce you get it working its actually really fun to watch.","Q_Score":0,"Tags":"python,python-3.x,python-requests","A_Id":62487964,"CreationDate":"2020-06-20T15:14:00.000","Title":"Python script to enter data in website inputs","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"can i run multiple python http servers on one machine to receive http post request from a webpage?\ncurrently i am running an http server on port 80 and on the web page there is a HTML form which sends the http post request to the python server and in the HTML form i am using the my server's address like this : \"http:\/\/123.123.123.123\" and i am receiving the requests\nbut i want to run multiple servers on the same machine with different ports for  each server.\nif i run 2 more servers on port 21200 and 21300 how do i send the post request from the HTML form on a specified port , so that the post request is received and processed by correct server??\ndo i need to define the server address like this : \"http:\/\/123.123.123.123:21200\" and \"http:\/\/123.123.123.123:21300\" ?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":912,"Q_Id":62490441,"Users Score":3,"Answer":"Yes can run multiple webservers on one machine.\nuse following commands to run on different ports:\npython3 -m http.server 4000\n4000 is the port number, you can replace it with any port number here.","Q_Score":0,"Tags":"python,html,http-post","A_Id":62490625,"CreationDate":"2020-06-20T19:06:00.000","Title":"is it possible to run multiple http servers on one machine?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I just finished my app and made a release version with buildozer and signed it but when I tried to upload my apk file to Google Play Console...It said that the API level of the app was 27 and it should be level 28. So how can I do this?\nThanks in advance","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":340,"Q_Id":62493617,"Users Score":0,"Answer":"It should be edited in buildozer.spec file.\nIf you scroll down it's default to 27, change it to specification","Q_Score":0,"Tags":"python,android,python-3.x,kivy,buildozer","A_Id":62495552,"CreationDate":"2020-06-21T01:52:00.000","Title":"How to change API level when using buildozer?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I just finished my app and made a release version with buildozer and signed it but when I tried to upload my apk file to Google Play Console...It said that the API level of the app was 27 and it should be level 28. So how can I do this?\nThanks in advance","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":340,"Q_Id":62493617,"Users Score":0,"Answer":"Find the line that says android.api = 27 in your buildozer.spec file and change it to 28.","Q_Score":0,"Tags":"python,android,python-3.x,kivy,buildozer","A_Id":62494264,"CreationDate":"2020-06-21T01:52:00.000","Title":"How to change API level when using buildozer?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a custom User model in django. Some other models are related to that user model like UserDetails, Prlofile etc.\nNow I need on around 100k users in my database for a testing purpose.\nI just wanna create users by changing tehir email address which is in User model.\nWhat is the best way to create suchc a large number of objects and save it to database also with corresponding related models.","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":58,"Q_Id":62496174,"Users Score":0,"Answer":"download a few thousand names in a file and code something, that will just add the name@gmail.com, name@email.com, name@whateveryouwant.com, and with the name, just make it nameRANDOMNUMBERS, same for the password. It will take time to get 100k, but I'm not sure, if there is an easier way to do it.","Q_Score":0,"Tags":"python,django,django-models","A_Id":62496258,"CreationDate":"2020-06-21T08:25:00.000","Title":"How to clone millions of copy of a database model in django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Impacted versions:\n12.0\nSteps to reproduce:\nI have made a customization to postpone the creation of pos order picking\nand delegate the task to a job\nsome time i get the error below\nCurrent behavior:\n2020-06-18 17:49:24,588 1370 ERROR cafe9.rabeh.io odoo.addons.base.models.ir_cron: Call from cron POS Orders: Process Pending Orders for server action #610 failed in Job #24\nTraceback (most recent call last):\nFile \"\/opt\/rabeh\/odoo\/odoo\/addons\/base\/models\/ir_cron.py\", line 102, in _callback\nself.env['ir.actions.server'].browse(server_action_id).run()\nFile \"\/opt\/rabeh\/odoo\/odoo\/addons\/base\/models\/ir_actions.py\", line 569, in run\nres = func(action, eval_context=eval_context)\nFile \"\/opt\/rabeh\/odoo\/odoo\/addons\/base\/models\/ir_actions.py\", line 445, in run_action_code_multi\nsafe_eval(action.sudo().code.strip(), eval_context, mode=\"exec\", nocopy=True)  # nocopy\nallows to return 'action'\nFile \"\/opt\/rabeh\/odoo\/odoo\/tools\/safe_eval.py\", line 350, in safe_eval\nreturn unsafe_eval(c, globals_dict, locals_dict)\nFile \"\/opt\/rabeh-12\/rabeh_addons\/pos_pending_session\/models\/pos_order.py\", line 68, in pending_picking_creation\npo_order.create_picking()\nFile \"\/opt\/rabeh-12\/rabeh_addons\/pos_pending_session\/models\/pos_order.py\", line 36, in\ncreate_picking\nres = super(PosOrder, orders).create_picking()\nFile \"\/opt\/rabeh\/odoo\/addons\/point_of_sale\/models\/pos_order.py\", line 841, in create_picking\norder._force_picking_done(order_picking)\nFile \"\/opt\/rabeh\/odoo\/addons\/point_of_sale\/models\/pos_order.py\", line 856, in _force_picking_done\npicking.action_done()\nFile \"\/opt\/rabeh\/odoo\/addons\/stock\/models\/stock_picking.py\", line 631, in action_done\ntodo_moves._action_done()\nFile \"\/opt\/rabeh\/odoo\/addons\/purchase_stock\/models\/stock.py\", line 96, in _action_done\nres = super(StockMove, self)._action_done()\nFile \"\/opt\/rabeh\/odoo\/addons\/stock_account\/models\/stock.py\", line 389, in _action_done\nres = super(StockMove, self)._action_done()\nFile \"\/opt\/rabeh\/odoo\/addons\/stock\/models\/stock_move.py\", line 1137, in _action_done\nmoves_todo.mapped('move_line_ids')._action_done()\nFile \"\/opt\/rabeh\/odoo\/addons\/stock\/models\/stock_move_line.py\", line 445, in _action_done\nQuant._update_available_quantity(ml.product_id, ml.location_dest_id, quantity, lot_id=ml.lot_id, package_id=ml.result_package_id, owner_id=ml.owner_id, in_date=in_date)\nFile \"\/opt\/rabeh\/odoo\/addons\/stock\/models\/stock_quant.py\", line 216, in _update_available_quantity\nself._cr.execute(\"SELECT 1 FROM stock_quant WHERE id = %s FOR UPDATE NOWAIT\", [quant.id], log_exceptions=False)\nFile \"\/opt\/rabeh\/odoo\/odoo\/sql_db.py\", line 148, in wrapper\nreturn f(self, *args, **kwargs)\nFile \"\/opt\/rabeh\/odoo\/odoo\/sql_db.py\", line 225, in execute\nres = self._obj.execute(query, params)\npsycopg2.errors.SerializationFailure: could not serialize access due to concurrent update\nExpected behavior:\ni think this line should generate could not obtain lock\ni was just wondering when it could generate \"could not serialize access due to concurrent update\"","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1122,"Q_Id":62498500,"Users Score":0,"Answer":"It could have obtained the lock, as the lock is currently available.  But it had been locked at some previous point which overlaps with the current transaction's snapshot.  So obtaining the lock is possible, but would create a serialization problem if it were to acquire it.  Reporting that as a serialization failure seems like the correct outcome.\nUsing FOR UPDATE NOWAIT in a transaction with elevated isolation level seems inconsistent, or at least unnecessary.  What are you hoping to accomplish by doing this?  Your description of \"while creating pos picking from a job\" doesn't elucidate this for me.  Is that some odoo-specific jargon?","Q_Score":0,"Tags":"python,postgresql,odoo,odoo-12","A_Id":62500903,"CreationDate":"2020-06-21T12:29:00.000","Title":"could not serialize access due to concurrent update while creating pos picking from a job","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I wonder if there is any example or suggested solution to use BeautifulSoup to scrape the data on a site that could be accessed by clicking on a hyperlink on the main webpage.\nThank you so much!!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":24,"Q_Id":62507917,"Users Score":0,"Answer":"Sure. Can you inspect element to get the link and then scrape it? That could also be done programmatically.","Q_Score":0,"Tags":"python,web-scraping,beautifulsoup,hyperlink,jupyter-notebook","A_Id":62507932,"CreationDate":"2020-06-22T05:22:00.000","Title":"Scrape data from new site by following link","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to flask. I am developing a web application using flask and postgres. I have already designed database. I know sqlalchemy is orm. Do I still need to use sqlalchemy in flask if my database was already designed without sqlalchemy. I have to use that database for fetching and updating values. While going further will sqlalchemy is useful to me? or can I simply use db connector and proceed?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":658,"Q_Id":62509725,"Users Score":1,"Answer":"Using sqlalchemy will help you fetching\/inserting data very easy, no matter you designed your db manually, you just need to define your design and then instead of writing multiple lines, you write a line and everything done.\nIt also help you handle errors and a lot more.\nStrongly suggest you to use it.","Q_Score":1,"Tags":"python,postgresql,flask,sqlalchemy","A_Id":62509888,"CreationDate":"2020-06-22T07:50:00.000","Title":"Do I need to use sqlalchemy if my database was already designed manually?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My question is do i have to install django every single time in my virtual environment in order to run my python files? and is this taking up bunch of space on my machine? My project also uses \"matplotlib\" and every virtual environment i create it also asks me to import the matplotlib module too. its getting annoying. do i have to do this every time?\nIm new to Django. I wanted to run some python files in django but they weren't working, so after some research i found out i needed to run my pycharm project in a virtual environment in order to run these python files.\nmy folders look like this pycharmProjects -> my project\nI enter pycharmProjects and I set up virtual environment using \"pienv shell\". Then i run \"python3 manage.py runserver\". It turns out i must install django in the virtual environment before the files run.","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":146,"Q_Id":62524773,"Users Score":1,"Answer":"Short answer yes.\nIf you create a virualenv you have to install all packages, that your program needs.\nLong answer:\nYou could install django system wide and then create a virtualenv with the option\n--system-site-packages then django would be used from your globally installed python.\n(Or you install everything just in your global python, put I personally don't think this is good practice)\nIf you work with many different projects I think you will avoid a lot of trouble if you use one virtualenv per project.\nTrouble meaning that  one project breaks, because one pip install for another project changed the version of one package and one project can't handle the newer version.\nI would recommend to create a requirements.txt file for each project, that lists the dependencies then you can create the virtualenv with following command\npip install -r requirements.txt\nif you have requirement.txt files, then you can create virtualenvs rather quickly if going back to an old project and you can delete the virtualenvs whenever you run out of disk space. If you want to be an the safe side, type pip freeze > pipfreeze.txt prior to deleting the virtualenv and use pip install -r pipfreeze.txt if you want to create one with the same modules and the same versions.\nYou also might want to look at direnv or autoenv if working on a linux like system.\nThis will automatically switch to the required virtualenv when changing to a project's working directory.","Q_Score":0,"Tags":"python,django","A_Id":62525282,"CreationDate":"2020-06-22T22:56:00.000","Title":"Installing Django and modules in virtual environment","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"My question is do i have to install django every single time in my virtual environment in order to run my python files? and is this taking up bunch of space on my machine? My project also uses \"matplotlib\" and every virtual environment i create it also asks me to import the matplotlib module too. its getting annoying. do i have to do this every time?\nIm new to Django. I wanted to run some python files in django but they weren't working, so after some research i found out i needed to run my pycharm project in a virtual environment in order to run these python files.\nmy folders look like this pycharmProjects -> my project\nI enter pycharmProjects and I set up virtual environment using \"pienv shell\". Then i run \"python3 manage.py runserver\". It turns out i must install django in the virtual environment before the files run.","AnswerCount":2,"Available Count":2,"Score":0.1973753202,"is_accepted":false,"ViewCount":146,"Q_Id":62524773,"Users Score":2,"Answer":"Short answer is no, you don't have to use a virtual environment at all and can install your dependancies globally instead. However you will soon find that it will cause a lot of issues. The main reason you would create a virtual environment is to give control of your dependancies and prevent bugs that could be caused because of them having their wires crossed between projects.","Q_Score":0,"Tags":"python,django","A_Id":62524987,"CreationDate":"2020-06-22T22:56:00.000","Title":"Installing Django and modules in virtual environment","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am looking for the best solution for Python to autopost to instagram from a database of images. I have already made a script using instabot that does this but cant figure out how to post a carousel of images, instead of just one.\nI am wondering what the current best solution for Python Instagram coding is as there is quite a lot of outdated information floating around the web...","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":307,"Q_Id":62529675,"Users Score":1,"Answer":"You Can Use A Combination Of Selenium and PyAutoGUI And It Will Be Really Easy! :D\nHope It Helps,\nYash","Q_Score":1,"Tags":"python,instagram","A_Id":62529791,"CreationDate":"2020-06-23T07:39:00.000","Title":"Automatic Instagram Posting in Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm currently using AzureML with pretty complex workflows involving large datasets etc. and I'm wondering what is the best way to manage the splitting resulting of preprocessing steps. All my projects are built as pipelines fed by registered Datasets. I want to be able to track the splitting in order to easily retrieve, for example, test and validation sets for integration testing purposes.\nWhat would be the best pattern to apply there ? Registering every intermediate set as different Dataset ? Directly retrieving the intermediate sets using the Run IDs ? ...\nThaanks","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":149,"Q_Id":62538688,"Users Score":1,"Answer":"Registration is to make sharing and reuse easier so that you can retrieve the dataset by its name. If you do expect to reuse the test\/validation sets in other experiments, then registering them make sense. However, if you are just trying to keep records of what you used for this particular experiment, you can always find those info via Run as you suggested.","Q_Score":2,"Tags":"python,azure,azure-machine-learning-service,azureml","A_Id":62539738,"CreationDate":"2020-06-23T15:46:00.000","Title":"Best way to manage train\/test\/val splits on AzureML","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am running a django project and I want to divide up my python code into separate files. At the moment I am running my functions from views.py. In my views.py I have a plot function. I have taken this plotting code and I have created python file called plotting.py which has this plot function in it. this plotting file lives in the same folder as my views.py\nMy problem is accessing this plotting.py file. I am trying to access it through from the urls.py by path('plot', plotting.plot),. it is not working. Or do I have to link back to a function in views.pyand from tat function go toplotting.py`?","AnswerCount":4,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":152,"Q_Id":62544466,"Users Score":1,"Answer":"Is this plot function a view where you are returning a response to the client or is this a helper function that you are trying to call from within a view? If it isn't a view, I would recommend adding from .plotting import plot to the top of your views.py file","Q_Score":0,"Tags":"python,python-3.x,django","A_Id":62544530,"CreationDate":"2020-06-23T22:06:00.000","Title":"Running a python file other than views.py in django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am running a django project and I want to divide up my python code into separate files. At the moment I am running my functions from views.py. In my views.py I have a plot function. I have taken this plotting code and I have created python file called plotting.py which has this plot function in it. this plotting file lives in the same folder as my views.py\nMy problem is accessing this plotting.py file. I am trying to access it through from the urls.py by path('plot', plotting.plot),. it is not working. Or do I have to link back to a function in views.pyand from tat function go toplotting.py`?","AnswerCount":4,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":152,"Q_Id":62544466,"Users Score":0,"Answer":"should you not do from plotting.py import plot and then you can use plot in views.py?","Q_Score":0,"Tags":"python,python-3.x,django","A_Id":62544505,"CreationDate":"2020-06-23T22:06:00.000","Title":"Running a python file other than views.py in django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My trial licence for xlwings PRO expired and now I get a license validation error.I tried reinstalling xlwings to no avail: it still installed PRO version and is asking for valid license. Conda installation here, Python 3.7.\nAny ideas?\nI cannot find any info in documentation.\nThanks!","AnswerCount":3,"Available Count":2,"Score":0.0665680765,"is_accepted":false,"ViewCount":232,"Q_Id":62544555,"Users Score":1,"Answer":"Try to upgrade to the latest version - there was a bug with 0.19.0. A simple conda upgrade xlwings will fix this.","Q_Score":1,"Tags":"python-3.x,conda,xlwings","A_Id":62555164,"CreationDate":"2020-06-23T22:15:00.000","Title":"Downgrade xlWings PRO","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"My trial licence for xlwings PRO expired and now I get a license validation error.I tried reinstalling xlwings to no avail: it still installed PRO version and is asking for valid license. Conda installation here, Python 3.7.\nAny ideas?\nI cannot find any info in documentation.\nThanks!","AnswerCount":3,"Available Count":2,"Score":0.0665680765,"is_accepted":false,"ViewCount":232,"Q_Id":62544555,"Users Score":1,"Answer":"I got it work with the awesomely quick help from xlwings themselves!\nWhen I was trying PRO version I added python code to excel sheets with .py ending and that was triggering to use .pro version of xlwings and therefore asking for license. I just needed to delete those sheets with python code.\nMaybe this will be useful for someone else...","Q_Score":1,"Tags":"python-3.x,conda,xlwings","A_Id":62556585,"CreationDate":"2020-06-23T22:15:00.000","Title":"Downgrade xlWings PRO","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"could someone help me with one problem? I want to add a process bar when you waiting for a response from the server (Django 3.x).\nStep to reproduce:\n\nOn the page 'A' we have the form.\nEnter data to form.\nSubmit POST request by clicking to button on the page 'A'.\nWaiting for getting the result on the page 'A'.\nGet the result on the page 'A'.\n\nSo, I want to add process bar after 4th and before 5th points on the page 'A'. When you will get the result on the page 'A' it should disappear.\nPython 3.7\nDjango 3.x","AnswerCount":3,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":412,"Q_Id":62549890,"Users Score":0,"Answer":"You can use nprogress, it's a library used for progress bars. Use this inside the interceptor where you can config it for displaying only when request is in progress until finished.","Q_Score":0,"Tags":"javascript,python-3.x,django","A_Id":62550133,"CreationDate":"2020-06-24T07:29:00.000","Title":"How to add a process bar when you waiting for a response from the server","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"The web2py online book in Chapter 3 Overview says that in the scaffolding application, values for response.title, response.meta.author, etc, are set in the file models\/menu.py. While previous versions of Web2py did include the settings in menu.py, in v.2.18.5 the default values are not set in this file. While some of the settings, such as response.meta.author etc are defined in models\/db.py, response.title and response.subtitle could not be found in db.py also. The online book does say that these can be defined in any model file. Can someone advise where these settings are now defined?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":75,"Q_Id":62551646,"Users Score":1,"Answer":"It appears that those items are no longer defined in the scaffolding app. The default layout simply using request.application as the page title if request.title is not defined. Feel free to define those items wherever, or not at all.","Q_Score":0,"Tags":"python,layout,default,web2py","A_Id":62554510,"CreationDate":"2020-06-24T09:17:00.000","Title":"Web2py layout configuration settings","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am working on a scraper built in RSelenium. A number of tasks are more easily accomplished using Python, so I've set up a .Rmd file with access to R and Python code chunks.\nThe R-side of the scraper opens a website in Chrome, logs in, and accesses and scrapes various pages behind the login wall. (This is being done with permission of the website owners, who would rather users scrape the data ourselves than put together a downloadable.)\nI also need to download files from these pages, a task which I keep trying in RSelenium but repeatedly come back to Python solutions.\nI don't want to take the time to rewrite the code in Python, as it's fairly robust, but my attempts to use Python result in opening a new driver, which starts a new session no longer logged in. Is there a way to have Python code chunks access an existing driver \/ session being driven by RSelenium?\n(I will open a separate question with my RSelenium download issues if this solution doesn't pan out.)","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":28,"Q_Id":62560581,"Users Score":0,"Answer":"As far as I can tell, and with help from user Jortega, Selenium does not support interaction with already open browsers, and Python cannot access an existing session created via R.\nMy solution has been to rewrite the scraper using Python.","Q_Score":0,"Tags":"python,r,selenium,web-scraping,selenium-chromedriver","A_Id":63379878,"CreationDate":"2020-06-24T17:15:00.000","Title":"Can a Python + R file share a webdriver session between the languages?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I would like to send a HTML email formatted with Materialize CSS in Django, can any one help me?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":17,"Q_Id":62563660,"Users Score":1,"Answer":"HTML emailing does not support separate CSS. You have to define the style in the element.","Q_Score":0,"Tags":"python,django","A_Id":62563700,"CreationDate":"2020-06-24T20:34:00.000","Title":"Why do html rendared emails not recognize cdn based css?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm an experienced developer, but not very familiar with Python and Pyramid.\nI'm trying to follow some (a bit old and unclear) instructions on deploying a Pyramid web application. My OS is Ubuntu 16.04.\nThe instructions say to install virtualenv and Pyramid - I do so with apt install virtualenv and apt install python-pyramid. Then they say I should run the app in a virtual environment, so I build that with virtualenv . -ppython3, and activate it with source bin\/activate. I install the application from a ready-to-run buildout from GitHub. The buildout includes a \"production.ini\" file with parameters to pserve.\nBut Pyramid is not included in the virtual environment built with virtualenv. (There is no \"pserve\" in the bin directory, e.g.) So I can't run the applications with bin\/pserve etc\/production.ini, as the instructions say. And if I try with only \"pserve\", I get errors when trying to access files like \"var\/waitress-%(process_num)s.sock\". Files that the app excepts to find in the virtual environment.\nI've looked for flags to tell virtualenv to include Pyramid, but couldn't find any. Am I overlooking something? I'd be most grateful for some help! :-)\n\/Anders from Sweden","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":146,"Q_Id":62578228,"Users Score":0,"Answer":"You mentioned it's using buildout - I assume this is zc.buildout. buildout usually manages its own virtualenv and handles installing all of the necessary dependencies. It really depends on how that buildout is configured as there's no standard there for what to do or how to run your app. I would normally expect pserve to be exposed in the bin folder, but maybe another app-specific script is exposed instead.","Q_Score":0,"Tags":"python,virtualenv,pyramid","A_Id":62607113,"CreationDate":"2020-06-25T14:53:00.000","Title":"Pyramid not included in Python virtualenv","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Given any image of a scanned document, I want to check if it's not empty page.\nI know I can send it to AWS Textract - but it will cost money for nothing.\nI know I can use pytesseract but maybe there is more elegant and simple solution?\nOr given a .html file that represents the text of the image - how to check it shows a blank page?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":1208,"Q_Id":62580362,"Users Score":1,"Answer":"We can use pytesseract for this application by thresholding the image and passing it to tesseract. However if you have a .html file that represents text of image, you can use beautifulsoup for extracting text from it and check if it is empty.Still this is a round way approach.","Q_Score":0,"Tags":"python,opencv,ocr,python-tesseract","A_Id":62580455,"CreationDate":"2020-06-25T16:48:00.000","Title":"How to check if image contains text or not?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to developing a website and because of my familiarity with Python and considering the complexity of the website, I chose Django.\nI want to know the best practice for developing a template through the Django framework. My question is two-fold.\n\nIs it best to have a bunch of for loops \/ if statements in the template\nusing template tags and other features of Django?\nOr is it passing the variables from Django to Javascript through JSON and then\nloading the page asynchronously?\n\nFor the first, I found the following merits: its fairly easy. I know what I want, I code the loops and I get the result that I expect. Plus giving IDs \/ names to HTML tags is super simple. Inline scripting also becomes simple, but I personally dont like it. But as objects start to get high in number, page load speed suffers.\nFor the second, and I am very new to this, the ease is gone. There is, I feel, another hoop to jump through Javascript, with JSON parsing and then the actual modeling.\nIf not either first or second, may be there is a balance between the two?\nAll help is appreciated.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":124,"Q_Id":62586513,"Users Score":1,"Answer":"If i got your question correctly then i think the answer is AJAX i.e, using the same page to load different content.You don't have to go to another page but on the same page, setting some links, you can pull newer data without loading a new page.\nHope this helped you!","Q_Score":1,"Tags":"javascript,python,django","A_Id":62587170,"CreationDate":"2020-06-26T01:10:00.000","Title":"Django project, pure javascript, html and template tags best practices","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Python 3.8.3, Scrapy 2.2.0 and Twisted-20.3.0-cp38-cp38-win_amd64.whl are installed on my computer. Everything works as expected.\nI can\u2019t install Scrapy without Twisted, so Twisted is also installed, but when I try to transfer the application to Heroku, an error appears. How do I use Scrapy on Heroku?\n-----> Found python-3.6.10, removing\n-----> Requirements file has been changed, clearing cached dependencies\n-----> Installing python-3.8.3\n-----> Installing pip\n-----> Installing SQLite3\n-----> Installing requirements with pip\n       ERROR: Twisted-20.3.0-cp38-cp38-win_amd64.whl is not a supported wheel on this platform.\n !     Push rejected, failed to compile Python app.\n !     Push failed```","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":922,"Q_Id":62594645,"Users Score":0,"Answer":"Remove Twisted-20.3.0-cp38-cp38-win_amd64.whl in your requirement.txt\nI don't think it's required because while installing scrapy it will be taken care of","Q_Score":0,"Tags":"python,heroku,twisted","A_Id":63981172,"CreationDate":"2020-06-26T12:20:00.000","Title":"ERROR: Twisted-20.3.0-cp38-cp38-win_amd64.whl is not a supported wheel on this platform","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Scenario\nHi, I have a collection of APIs that I run on Postman using POST requests. The flask and redis servers are set up using docker.\nWhat I'm trying to do\nI need to profile my setup\/APIs in a high traffic environment. So,\n\nI need to create concurrent requests calling these APIs\n\nThe profiling aims to get the system conditions with respect to memory (total memory consumed by the application), time (total execution time taken to create and execute the requests) and CPU-time (or the percentage of CPU consumption)\n\n\nWhat I have tried\nI am familiar with some memory profilers like mprof and time profiler like line_profiler. But I could not get a profiler for the CPU consumption. I have run the above two profilers (mprof and line_profiler) on a single execution to get the line-by-line profiling results for my code. But this focuses on the function wise results.I have also created parallel requests earlier using asyncio,etc but that was for some simple API-like programs without POSTMAN. My current APIs work with a lot of data in the body section of POSTMAN\nWhere did I get stuck\nWith docker, this problem gets trickier for me.\n\nFirstly, I am unable to get concurrent requests\n\nI do not know how to profile my APIs when using POSTMAN (perhaps there is an option to do it without POSTMAN) with respect to the three parameters: time, memory and CPU consumption.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":247,"Q_Id":62597631,"Users Score":0,"Answer":"I suppose that you've been using the embbed flask server(dev server) that is NOT production ready and,by default, it supports only on request per time. For concurrent requests should be looking to use gunicorn or some other wsgi server like uWsgi.\nPostman is only a client of your API, i don't see it's importance here. If you want to do a stress test or somethin like that, you can write your own script or use known tools, like jmetter.\nHope it helps!","Q_Score":0,"Tags":"python,python-3.x,docker,postman,profiler","A_Id":62598094,"CreationDate":"2020-06-26T15:06:00.000","Title":"How to profile my APIs for concurrent requests?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using chatterbot, I want to send clickable link and Mail as per message sent by the user. I cant find any link or reference on how to do this","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":72,"Q_Id":62599758,"Users Score":0,"Answer":"Try using linkify.... pip install autolink... linkify (bot.get_response(usr_text))","Q_Score":0,"Tags":"python,flask,bots,chatterbot","A_Id":62600578,"CreationDate":"2020-06-26T17:16:00.000","Title":"How to send clickable link and Mail in Chatterbot flask app","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to use flask-Socketio. But the problem is that the sessionId (sid) is transmitted in the URL. Which means that anybody sniffing can steal the sessionId.\nHow can flask send the sessionId backin a Post?\nThanks in advance for any help!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":187,"Q_Id":62605638,"Users Score":0,"Answer":"Your production server should use SSL so that nobody can see the contents of the requests and responses that are exchanged.\nThe session ID in the URL is part of the Socket.IO protocol, not a choice of the Flask-SocketIO package. To be accurate, the server sends the session id in a JSON response, and then the client adds it to the URL in follow-up requests. That's how the protocol works.\nData included in the JSON response can also be picked up by intermediaries if not encrypted, this isn't a problem specific to the URL. The solution is to use encryption.","Q_Score":0,"Tags":"security,socket.io,flask-socketio,flask-session,python-socketio","A_Id":62621757,"CreationDate":"2020-06-27T03:50:00.000","Title":"flask-SocketIO sessionId in URL not secure","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I decided to ask this here after googling for hours. I want to create my own API endpoint on my own server.\nEssentially I want to be able to just send a yaml payload to my server, when received I want to kick off my python scripts to parse the data and update the database. I'd also like to be able to retrieve data with a different call. I can code the back-end stuff, I just don't know how to make that bridge between hitting the server from outside and having the server do the things in the back-end in python.\nIs django the right way? I've spent a couple days doing Django tutorials, really cool stuff, but I don't really need a website right now but whenever I search for web and python together, django pretty much always comes up. I don't need any python code help, just some direction on how to create that bridge.\nThanks.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":43,"Q_Id":62605840,"Users Score":0,"Answer":"DRF was what I was looking for. As suggested.","Q_Score":0,"Tags":"python,django,api-design","A_Id":62650822,"CreationDate":"2020-06-27T04:24:00.000","Title":"creating an api to update postgres db with a json or yaml payload","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to JavaScript and noticed when I install libraries using npm the node_modules folder is large and it's taking much time and that's not the case in python when I install Django or any library for example!\nso how NodeJs is different from Python at installing packages?\nI searched on Quora, YouTube, reddit and didn't found a clear comparison between both","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":1268,"Q_Id":62610987,"Users Score":1,"Answer":"npm uses local dependencies, so the same module is installed over and over again for every project and every transitive dependency. pip uses global dependencies (at least global to the virtualenv, if used) which avoids this.\nApart from that, pythons standard library is much more larger than the one found in javascript. Thus, much more packages are needed in JS compared to python. Additionally, aspects like transpilation (Babel) are more prevalent in JS than in python.","Q_Score":0,"Tags":"python,node.js,npm,pip,node-modules","A_Id":62611148,"CreationDate":"2020-06-27T14:01:00.000","Title":"why node_modules are so heavy and python dependencies are light?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have an android app that consumes Django REST APIs. The app is capturing several parameters and has 50-60 images captured. The data is being sent to the server which then parses JSON, uploads all images to cdn server and inserts that data into PostgreSQL tables depending on some logic. I am generating a PDF report using WK-HTML fetching back the same data. This PDF needs to be sent as response to API call. This entire process is taking time while the user is waiting on the app for PDF file.\nOne thing I could do is use the JSON to generate PDF but I am not sure if all the images have been uploaded to CDN and can be used in PDF report.\nHow can I achieve better results? Any guidance will be really appreciated.\nTIA.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":75,"Q_Id":62612393,"Users Score":0,"Answer":"You can run the generation in the background and send the user a notification with download link when it is ready.","Q_Score":0,"Tags":"python,django,multithreading,django-rest-framework,multitasking","A_Id":62613756,"CreationDate":"2020-06-27T16:07:00.000","Title":"Multiple Tasks in Serial Order Python Django Framework","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm creating a website using flask. One of the pages is a list of in-house guests populated from a linked database. I want the name of each guest to be a link that when clicked will redirect to a new page that has that guest's specific infromation. I can create a template called 'guest.html' as normal, but I'm struggling to figure out how to tell the new template which guest was selected.\nHow can I retain the information of which link was clicked if they all essentially lead to the same template?\nI hope this isn't a silly question, I've looked for a while with no results.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":48,"Q_Id":62618058,"Users Score":0,"Answer":"Build a new route like '\/profile' which takes a dynamic component like a username. So when a person clicks the name of the guest's username, the username is sent to the profile route. Now in the profile route function get the details of the guest from the database using the username from the route and pass the details of the guest to the guest.html and render the page. I hope this helps.","Q_Score":0,"Tags":"python,html,flask,jinja2,flask-sqlalchemy","A_Id":62619040,"CreationDate":"2020-06-28T03:59:00.000","Title":"Create a list of links in flask","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"i have a django project with 50 url (in 1 application).\ni would set a custom middleware for 20 urls.\nwhen add middleware to MIDDLEWARE_CLASSES , this set for all urls .\nHow should this be done?\n(i use last version of python and djnago)","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1455,"Q_Id":62618099,"Users Score":0,"Answer":"you can either add a check condition to your middleware which is not recommended(since you cannot determine whether this middleware is working or not without reading it's code). or create a decorator for those views, decorator job is exactly this.","Q_Score":1,"Tags":"python,django","A_Id":62618505,"CreationDate":"2020-06-28T04:07:00.000","Title":"how i can set middleware for some views in django?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm building an app which has a feature for embedding expressions\/rules in a config yaml file. So for example user can reference a variable defined in yaml file like ${variables.name == 'John'} or ${is_equal(variables.name, 'John')}. I can probably get by with simple expressions but I want to support complex rules\/expressions such ${variables.name == 'John'} and (${variables.age > 18} OR ${variables.adult == true})\nI'm looking for a parsing\/dsl\/rules-engine library that can support these type of expressions and normalize it. I'm open using ruby, javascript, java, or python if anyone knows of a library for that languages.\nOne option I thought of was to just support javascript as conditons\/rules and basically pass it through eval with the right context setup with access to variables and other reference-able vars.","AnswerCount":7,"Available Count":1,"Score":0.0285636566,"is_accepted":false,"ViewCount":3639,"Q_Id":62643102,"Users Score":1,"Answer":"One option I thought of was to just support javascript as\nconditons\/rules and basically pass it through eval with the right\ncontext setup with access to variables and other reference-able vars.\n\nI would personally lean towards something like this. If you are getting into complexities such as logic comparisons, a DSL can become a beast since you are basically almost writing a compiler and a language at that point. You might want to just not have a config, and instead have the configurable file just be JavaScript (or whatever language) that can then be evaluated and then loaded. Then whoever your target audience is for this \"config\" file can just supplement logical expressions as needed.\nThe only reason I would not do this is if this configuration file was being exposed to the public or something, but in that case security for a parser would also be quite difficult.","Q_Score":7,"Tags":"javascript,java,python,dsl,rule-engine","A_Id":62706665,"CreationDate":"2020-06-29T16:58:00.000","Title":"Creating a DSL expressions parser \/ rules engine","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I had a virtual environment setup for Django 3 with visual studio. However at some point it seems that this previous environment has been damaged - and therefore is no longer working (nothing appears on git to have changed).\nI therefore attempted to setup a new environment via the visual studio python environment options. I could setup a conda environment but it will not let me setup a python environment as \"you will need to install a python interpreter...\". However on the same page it states that the latest python 64 is installed.\nIt will not run with the conda environment that I have setup as it states \"The environment '....' is not available.\"\nI have tried creating a new solution with VS and this appears to work as intended. However it is not really an option to create a new solution as I will loose a lot of existing git commits along with this causing issues with existing servers.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":84,"Q_Id":62652492,"Users Score":0,"Answer":"Edit - Found my own answer to this question.\nAs new projects were allowing virtual environments to be created I figured it must be something to do with visual studio storing some reference to an old interpreter.\nTherefore, Deleting the .vs folder inside my project allowed regeneration of the visual studio files and creation of a new virtual environment.","Q_Score":0,"Tags":"python,django,visual-studio,virtual-environment","A_Id":62769795,"CreationDate":"2020-06-30T07:38:00.000","Title":"Django Visual Studio The environment '....' is not available","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've been all over the site trying to find a solution for a problem i am running into with my virtual environment and the python version being used.\nI have installed mini conda\nI am on a Mac\nI have run the conda create myDjangoEnv python=3.6 conda commmand, and i have activated the env with the conda activate myDjangoEnv command.\nI have confirmed that django is installed in the venv and the version is 3.8.4\nThe problem I am running into is when trying to execute the command python manage.py runserver, I first get the from exc error. When checking python it says it is running 2.7 version in the atom terminal, however when i check my virenv in my normal terminal the python version returns with 3.6.\nIn the atom terminal, when i execute python3 manage.py runserver, the from exc error goes away but then I run into the ImportError: Django package cannot be found.\nHas anyone run into this issue specifically with the Atom server? Is there something I am doing wrong when creating the projects in atom that is tripping the virtual environment and resetting the python version to 2.7?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":102,"Q_Id":62660187,"Users Score":0,"Answer":"Are you using the package \"script\" in Atom?","Q_Score":0,"Tags":"python,python-3.x,django,atom-editor","A_Id":62660238,"CreationDate":"2020-06-30T14:49:00.000","Title":"Django virtual env issues with Python and Atom","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've been all over the site trying to find a solution for a problem i am running into with my virtual environment and the python version being used.\nI have installed mini conda\nI am on a Mac\nI have run the conda create myDjangoEnv python=3.6 conda commmand, and i have activated the env with the conda activate myDjangoEnv command.\nI have confirmed that django is installed in the venv and the version is 3.8.4\nThe problem I am running into is when trying to execute the command python manage.py runserver, I first get the from exc error. When checking python it says it is running 2.7 version in the atom terminal, however when i check my virenv in my normal terminal the python version returns with 3.6.\nIn the atom terminal, when i execute python3 manage.py runserver, the from exc error goes away but then I run into the ImportError: Django package cannot be found.\nHas anyone run into this issue specifically with the Atom server? Is there something I am doing wrong when creating the projects in atom that is tripping the virtual environment and resetting the python version to 2.7?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":102,"Q_Id":62660187,"Users Score":0,"Answer":"That issue may be related to you having multiple version of python installed and your terminal is pointing at the wrong one there. I recommend you switch to something like vscode, where you can ctrl shift P and select manually the venv and python interpreter used for the workspace and have your terminal there.","Q_Score":0,"Tags":"python,python-3.x,django,atom-editor","A_Id":62661178,"CreationDate":"2020-06-30T14:49:00.000","Title":"Django virtual env issues with Python and Atom","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"i am new to Python programming language and Django. I am learning about web development with Django, however, each time I create a new project in PyCharm, it doesn\u00b4t recognize django module, so i have to install it again. Is this normal? Because i\u00b4ve installed django like 5 times. It doesn\u00b4t seem correct to me, there must be a way to install Django once and for all and not have the necessity of using 'pip install django' for each new project I create, I am sure there must be a way but I totally ignore it, I think I have to add django to path but I really don\u00b4t know how (just guessing). I will be thankful if anyone can help me :)","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":54,"Q_Id":62668812,"Users Score":0,"Answer":"pycharm runs in a venv. A venv is an isolated duplicate (sort of) of python (interpreter) and other scripts. To use your main interpreter, change your interpreter location. The three folders (where your projects is, along with your other files) are just that. I think there is an option to inherit packages. I like to create a file called requirements.txt and put all my modules there. Comment for further help.\nIn conclusion, this is normal.","Q_Score":0,"Tags":"python,django,web","A_Id":62668864,"CreationDate":"2020-07-01T02:37:00.000","Title":"I must install django for every single project i make?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Attempting to run a python 2.7 app engine app locally using PyCharm (which uses dev_appserver) my machine is python 3.7 but I have a python 2.7 virtual env setup as the project interpreter, which works fine when running the project.\nHowever when attempting to debug the same run config (which runs fine) I am getting the following error\nERROR: (dev_appserver) python2: command not found\nI can run the python2 command in my terminal both inside and outside the virtual environment so I am not sure what is wrong here.\nI am currently running Pop!_OS 20.04 LTS if that helps.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":224,"Q_Id":62680759,"Users Score":0,"Answer":"I had the same issue after starting new AppEngine projects on python 3. Initially, I thought the problem was with a new version of Google Cloud SDK. I spent a lot of time linking\/unlinking python versions and playing around the environment variables.\nBut eventually, update of PyCharm to 2021.1.2 fixed the issue.","Q_Score":1,"Tags":"python,google-app-engine,pycharm,dev-appserver","A_Id":68097544,"CreationDate":"2020-07-01T15:58:00.000","Title":"Unable to Debug Dev Appserver using pycharm, but able to run fine","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":1,"Web Development":1},{"Question":"I need to implement aws presigned URL in python. but I want to make sure images are not greater than 2MB. but all new mobiles have images of around 8MB. How can I handle this? How can I compress the images without even uploading them to my server?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":28,"Q_Id":62685036,"Users Score":0,"Answer":"Here is a simple solution.\nCreate a lambda function that will take images and compress them to <2MB and then uploads them to the client-side.\nYou have to do processing on your side also for this plus lambda function will also add cost but it's a simple solution. You won't have to upload images to your server atlest.\nyou can add check on frontend if image >2MB then only it will compress otherwise directly upload.","Q_Score":1,"Tags":"python,amazon-web-services","A_Id":62685117,"CreationDate":"2020-07-01T20:42:00.000","Title":"AWS Presigned Url Generation","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am new to Django and trying to create an Application.\nMy scenario is:\nI have a form on which there are many items and user can click on Add to Cart to add those item to Cart. I am validating if the user is logged in then only item should be added to Cart else a message or dialogue box must appear saying please login or sign up first.\nAlthough I was able to verify the authentication but the somehow not able to show the message if user is not logged in.\nFor now I tried the below things:\n\nUsing session messages, but somehow it needs so many places to take care when to delete or when to show the message\nTried using Django Messages Framework, I checked all the configuration in settings.py and everything seems correct but somehow not showing up on HTML form\n\nDoes anyone can help me here?\nI want to know a approach where I can authenticate the user and if user is not logged in a dialogue box or message should appear saying Please login or Signup. It should go when user refreshes the page.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":37,"Q_Id":62686473,"Users Score":0,"Answer":"If you are using render() for views.py you could add a boolean value to the context\ni.e render(request \"template_name.html\", {\"is_auth\": True})\nAssumedly you are doing auth in the serverside so you could tackle it this way.\nNot a great fix but might help.","Q_Score":0,"Tags":"python,django,message","A_Id":62686650,"CreationDate":"2020-07-01T22:53:00.000","Title":"How to show messages in Python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Hi ive been developing some games in pygame and am looking to put them on a website for my friends to play, Ive been told that flask is the way for setting up a python website and then hosting on python anywhere, but so far I havent seen any guides on using pygame with flask and am unsure if the games will work with flask ie will it be able to display the pygame screen on the website as a normal browser game would","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":302,"Q_Id":62695130,"Users Score":0,"Answer":"No, it won't work like that.\nPygame doesn't have a browser \"backend\", it's purely for desktop games.","Q_Score":0,"Tags":"python,flask,pygame","A_Id":62695144,"CreationDate":"2020-07-02T11:16:00.000","Title":"Is flask compatible with pygame","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to set up my python web scraper to run at a set time using task scheduler but I am getting this error PermissionError: [Errno 13] Permission denied: 'geckodriver.log' I have no idea why because it works fun when running the python script by using the batch file or just by double-clicking the .py file. Anyone have any ideas about why it only happens with task scheduler.\nFYI: I am using a batch file that calls the python.exe and the .py script and this what task scheduler is using to trigger the script. I am using selenium and firefox.\nMany thanks.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":481,"Q_Id":62699600,"Users Score":0,"Answer":"I fixed this issue by checking the Run with highest privileges and configure for Windows 10","Q_Score":1,"Tags":"python,python-3.x,selenium,geckodriver","A_Id":62701037,"CreationDate":"2020-07-02T15:14:00.000","Title":"Geckodriver PermissionError: [Errno 13] Permission denied: 'geckodriver.log' only with task scheduler","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to download several large files from the internet (specifically Reddit monthly submissions from the site PushShift) into an S3 bucket. I am SSHed into an EC2 instance and have a Jupyter notebook running.\nIdeally I want to be able to write a Python script in Jupyter notebook of my EC2 instance that downloads the file from the internet and then pushes it to my S3 bucket. How would I go about doing this?","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":200,"Q_Id":62702724,"Users Score":2,"Answer":"It is not possible to \"download data from the Internet into Amazon S3\".\nAmazon S3 is an object storage service. You can upload data to S3 and download data from S3, but it is not possible to tell S3 to download data from some other location and store it.\nYou will need a program running somewhere that obtains the data from the Internet, then uploads it (creates an object) in Amazon S3. Such a program could be clever enough to 'stream' the data to S3 by downloading content in-memory and then sending it to S3, without having to save to disk in between, but you would need to write that code.\nAs to 'where' such a program might run, it would be most efficient to run such code either as an AWS Lambda function or on an Amazon EC2 instance that is in the same region as the Amazon S3 bucket.\nSince you are running a Jupyter notebook on an Amazon EC2 instance, it would be easiest to download the file to local storage, then upload it to S3.","Q_Score":0,"Tags":"python,amazon-web-services,amazon-s3,amazon-ec2,jupyter-notebook","A_Id":62706422,"CreationDate":"2020-07-02T18:20:00.000","Title":"How do I download data from the internet to an S3 bucket via EC2?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to link two projects Django. both of them project are run in the same server. What tools or file I need for this goal? when I click on some button in my current project's page I should get a page from the other project.. Can you suggest a way to do?","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":72,"Q_Id":62702805,"Users Score":0,"Answer":"Create REST APIs in one project and invoke the API data from the other. The same way you link a python flask project with ReactJS","Q_Score":0,"Tags":"python,django","A_Id":62703321,"CreationDate":"2020-07-02T18:25:00.000","Title":"How to link two projects django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"for my future project i would like my app to be live 24\/7 on a Linode\/UpCloud vps with 1 thread.\nMy app uses threading python library for multiple tasks, what will happen if i run that app on 1 thread?\nThanks!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":150,"Q_Id":62703399,"Users Score":5,"Answer":"Short Answer:\nIt will run fine. E.g.\n\nThread 1 is given CPU\nThread 2 is given CPU\nThread 1 is given CPU\nThread 1 is given CPU\nThread 2 is given CPU\n\nExplanation:\nMultithreading does not necessarily mean that it is also multi-processing. If there is only one CPU with one thread, then the threads in your application will run turn by turn (almost). And this context switch will be so fast that you cannot even feel it.\nEDIT (Thanks Barmar's comment):\nIt's called \"timesharing\", and it's how multiple processes work whenever the computer only has one CPU.","Q_Score":0,"Tags":"python,multithreading,vps","A_Id":62703621,"CreationDate":"2020-07-02T19:06:00.000","Title":"What will happen if i run a 2 threaded application on a vps server with 1 thread?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Dear smart people of stackoverflow,\nI know this question has been asked a lot here but none of the posted solutions have worked for me as of yet. Any help here would be much appreciated:\nThe Problem: Cannot connect to flask app server from other devices (PCs, mobiles) on the same network. (in other words: localhost works perfectly but I cannot connect from external device)\nWhat I've Tried:\n1) Setting app.run(host='0.0.0.0', port=5000, debug=True, threaded=True) in the app.py so that the server will listen on all available network interfaces.\n2) Enabling TCP traffic for port 5000 in local network in Windows Defender Firewall (with inbound and outbound rules added)\n3) Using my host PC's IPv4 address in the URL bar of my external device's browser in the following format: http:\/\/<host_ipaddress>:<port>\/\n4) Using my host PC's hostname in the URL bar of my external device's browser in the following format: http:\/\/<host_name>:<port>\/\n5) Running the app.py file from Windows Powershell and Python (.py) Executor\nNone of these solutions has worked so far, even after attempting to connect from a few different external devices. Thanks in advance for your help!","AnswerCount":6,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":4838,"Q_Id":62705271,"Users Score":0,"Answer":"I did a similar setup with my django project. Your PC network settings are probably all good, but your router ( at least for wlan) is blocking the traffic. I solved this by tampering with needed settings in router manager api, which can be found from 192.168.1.1 in your local network. You can check your device ip addresses etc.","Q_Score":4,"Tags":"python,flask,web-applications,localhost,ip","A_Id":62705377,"CreationDate":"2020-07-02T21:25:00.000","Title":"Connect to Flask Server from other devices on same network","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Dear smart people of stackoverflow,\nI know this question has been asked a lot here but none of the posted solutions have worked for me as of yet. Any help here would be much appreciated:\nThe Problem: Cannot connect to flask app server from other devices (PCs, mobiles) on the same network. (in other words: localhost works perfectly but I cannot connect from external device)\nWhat I've Tried:\n1) Setting app.run(host='0.0.0.0', port=5000, debug=True, threaded=True) in the app.py so that the server will listen on all available network interfaces.\n2) Enabling TCP traffic for port 5000 in local network in Windows Defender Firewall (with inbound and outbound rules added)\n3) Using my host PC's IPv4 address in the URL bar of my external device's browser in the following format: http:\/\/<host_ipaddress>:<port>\/\n4) Using my host PC's hostname in the URL bar of my external device's browser in the following format: http:\/\/<host_name>:<port>\/\n5) Running the app.py file from Windows Powershell and Python (.py) Executor\nNone of these solutions has worked so far, even after attempting to connect from a few different external devices. Thanks in advance for your help!","AnswerCount":6,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":4838,"Q_Id":62705271,"Users Score":5,"Answer":"I solved the issue by changing my home network profile to private instead of public, which allows my PC to be discoverable. Completely overlooked that!\nHope this helps someone!","Q_Score":4,"Tags":"python,flask,web-applications,localhost,ip","A_Id":62720199,"CreationDate":"2020-07-02T21:25:00.000","Title":"Connect to Flask Server from other devices on same network","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a question about flasks session logic. First of all as I know there are two ways to store session data, one is on client side and the second is server side. Flask, as I know, is using the former one (client side) where the session is encrypted and stored on the browser of the client.\nLet's us say we want to make a login on a flask-backend\n\nUser does a login, flask generates a session and through set-cookie the client stores the session\nUser makes another request to the backend and sends its cookies where also the session is stored and flask validates the session with the key which it used to encrypt the session\nWhen the session is valid, flask loads the session, thus that means the user is logged in\n\nAnd JWT works the following as I know. It generates a token and the client stores the token and sends it in each request to the server, where the token is validated.\nAs I know, both flask and JWT uses a secret to encrypt the data.\nSo can we say, that flask-session and JWT are somehow similar?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":549,"Q_Id":62715200,"Users Score":1,"Answer":"Both jwt and flask session work on client, but the key difference is that flask session stores the signed session data at the client cookie, but in jwt you have the independence to store the token anywhere you want, say localstorage, cookie etc.\nAnd jwt will be base64 encoded by default while in flask session it has to be done manually for security. But yes the difference between traditional sessions (say php) and flask-sessions is that the session data is stored in the client rather than as a file at the server (while the client cookie has session id in traditional sessions).","Q_Score":0,"Tags":"python,authentication,session,flask,jwt","A_Id":62718556,"CreationDate":"2020-07-03T12:11:00.000","Title":"Is Flask-Session logic similar to JWT","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a python application with flask but I can't connect to the mysql database that is on Azure.\nMy config.py\nSQLALCHEMY_DATABASE_URI = 'mysql:\/\/user@mysqlsvr:pass1234@mysqlsvr.mysql.database.azure.com:3306\/flask_db'\nAny suggestion?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":477,"Q_Id":62723170,"Users Score":1,"Answer":"I downloaded the certificate and it worked\nFollow\nSQLALCHEMY_DATABASE_URI = 'mysql:\/\/user@mysqlsvr:pass1234@mysqlsvr.mysql.database.azure.com:3306\/flask_db?ssl_ca=BaltimoreCyberTrustRoot.crt.pem'","Q_Score":2,"Tags":"python,flask-sqlalchemy,azure-mysql-database","A_Id":62727819,"CreationDate":"2020-07-03T22:02:00.000","Title":"SQLALCHEMY_DATABASE_URI with Azure Mysql","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm running a Python script in an AWS Lambda function. It is triggered by SQS messages that tell the script certain objects to load from an S3 bucket for further processing.\nThe permissions seem to be set up correctly, with a bucket policy that allows the Lambda's execution role to do any action on any object in the bucket. And the Lambda can access everything most of the time. The objects are being loaded via pandas and s3fs: pandas.read_csv(f's3:\/\/{s3_bucket}\/{object_key}').\nHowever, when a new object is uploaded to the S3 bucket, the Lambda can't access it at first. The botocore SDK throws An error occurred (403) when calling the HeadObject operation: Forbidden when trying to access the object. Repeated invocations (even 50+) of the Lambda over several minutes (via SQS) give the same error. However, when invoking the Lambda with a different SQS message (that loads different objects from S3), and then re-invoking with the original message, the Lambda can suddenly access the S3 object (that previously failed every time). All subsequent attempts to access this object from the Lambda then succeed.\nI'm at a loss for what could cause this. This repeatable 3-step process (1) fail on newly-uploaded object, 2) run with other objects 3) succeed on the original objects) can happen all on one Lambda container (they're all in one CloudWatch log stream, which seems to correlate with Lambda containers). So, it doesn't seem to be from needing a fresh Lambda container\/instance.\nThoughts or ideas on how to further debug this?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":192,"Q_Id":62725013,"Users Score":2,"Answer":"Amazon S3 is an object storage system, not a filesystem. It is accessible via API calls that perform actions like GetObject, PutObject and ListBucket.\nUtilities like s3fs allow an Amazon S3 bucket to be 'mounted' as a file system. However, behind the scenes s3fs makes normal API calls like any other program would.\nThis can sometimes (often?) lead to problems, especially where files are being quickly created, updated and deleted. It can take some time for s3fs to update S3 to match what is expected from a local filesystem.\nTherefore, it is not recommended to use tools like s3fs to 'mount' S3 as a filesystem, especially for Production use. It is better to call the AWS API directly.","Q_Score":0,"Tags":"python,amazon-s3,aws-lambda,python-s3fs","A_Id":62764794,"CreationDate":"2020-07-04T03:40:00.000","Title":"How to diagnose inconsistent S3 permission errors","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to extract articles from Wikipedia belonging to a specific category,for example company or person. Is there a good way to do this? Right now, I have a wikipedia data dump from which I can extract the page content, but I can't filter the data based on category. Also, can I get an exact number of articles from the wikipedia dump for the given category?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":766,"Q_Id":62729529,"Users Score":1,"Answer":"If you want an SQL solution, you can find the articles of a category by searching up rows in categorylinks.sql where cl_to=category_title. It gives all the page ids of the subcategories, articles. Then you can count all the rows where cl_type='subcat' to find the number of subcategories. cl_type='page' give the number of pages.\nTo find the corresponding title of the articles or the categories, you can use page.sql.\nAn alternative way is to just get the category.sql dump. It has the number of subcategories and articles of each category.\nThe actual names of the dumps in the latest enwiki dumps would be:\n\nenwiki-latest-categorylinks.sql\nenwiki-latest-page.sql","Q_Score":0,"Tags":"python,database,wikipedia,wikipedia-api","A_Id":63106234,"CreationDate":"2020-07-04T13:08:00.000","Title":"How to extract data from Wikipedia for a specific category like Person?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a Django server running with nginx and gunicorn.\nAll static files are served correctly, only the admin page has no css, js, etc. .\nI already ran collectstatic and restarted nginx and gunicorn.\nNothing changed.\nWhat can I do?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":47,"Q_Id":62743059,"Users Score":0,"Answer":"Make sure to mention the locations of your staticfiles_dirs in settings.py. Also remember to mention the locations of your static files in a dynamic format instead of hard coding them in your html document.And make sure to load static in base.html.","Q_Score":0,"Tags":"python,html,django,nginx,gunicorn","A_Id":62743422,"CreationDate":"2020-07-05T15:57:00.000","Title":"Django server does not serve static files for admin page","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I need to upload a csv file from my local to an existing project in Watson Studio using python.\nThanks in Advance.","AnswerCount":1,"Available Count":1,"Score":-0.3799489623,"is_accepted":false,"ViewCount":202,"Q_Id":62751319,"Users Score":-2,"Answer":"Go to Resource List > Click on Services > Db2 > Open Console > Click on Hand Burger Icon on right > Click on Load > Open Load Data > Upload your CSV File > using Drag n drop or browser","Q_Score":0,"Tags":"python,python-requests,ibm-watson,watson-studio","A_Id":62814372,"CreationDate":"2020-07-06T07:37:00.000","Title":"Upload asset(csv file) to watson studio project using python","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Have a flask api, everytime a endpoint is called triggers a job in Spark, open a Session which I close when it's done.\nThe job itself takes less than 2 Minutes.\nI start the session and close it everytime the method is called.\nIs it better to start a single Session and keep it always alive or just open and kill it everytime?\nThanks","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":114,"Q_Id":62753897,"Users Score":1,"Answer":"This will cause issue if you recieve bulk requests then multiple spark session will be created with the same resources.\nBetter keep the spark session running and serve the request using the same","Q_Score":1,"Tags":"python,apache-spark,pyspark","A_Id":62754480,"CreationDate":"2020-07-06T10:15:00.000","Title":"Best practices for Sparkessions Pyspark","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using the pyttsx3 module.\nI have the the Microsoft James voice installed and I can hear it when pressing the \"preview voice\" button in the windows speech settings.\nHowever when I try to view all the voices, only \"Microsoft David Desktop - English (United States)\" and \"Microsoft Zira Desktop - English (United States)\" come up.\nWhy doesn't the Microsoft James voice show up ?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":652,"Q_Id":62756194,"Users Score":1,"Answer":"First press the \"windows\" key and \"R\" key simultaneously A run window should pop up. Click on the run box and type \"regedit\" and click enter, click \"yes\" and proceed. A registry editor should pop up. Now continue at your own risk(make a registry backup, I don't know what it is just search it) . Double click on \"HKEY_LOCAL_MACHINE\", then \"SOFTWARE \" --> \"MICROSOFT \" sroll down then \"SPEECH SERVER\" --> \"v11.0\" now you should see \"Voices\".\nRight click on \"Voices\" and you should see \"Export\". Then save the file somwhere you know(any filename) Go to the location where you saved it then right click the file Now close the registry editor\nThen click on \"Open with\" --> Notepad After that click \"Ctrl\" + \"H\" A replace window should pop up In \"Find what\" type \"Speech Server\\v11.0\" In \"replace with\" type \"Speech\" Then click replace all Then save and close the file Then open the same file with \"Registry Editor\" Click yes on both pop ups\npress the \"windows\" key and \"R\" key simultaneously A run window should pop up. Click on the run box and type \"regedit\" and click enter, click \"yes\" and proceed. A registry editor should pop up.\nNow you would be seeing \"Voices\" If you look a little higher up you should see \"Speech Server\" And just on top of that is \"Speech\" Open \"Speech \" by double clicking it Under \"Voices\" and \"Tokens\" you should see your newly installed voice.\nNow scroll down until you see \"Wow6432Node\" Open that then, Open MICROSOFT \" sroll down then \"SPEECH SERVER\" --> \"v11.0\" now you should see \"Voices\".\nRight click on \"Voices\" and you should see \"Export\". Then save the file somwhere you know(any filename) Go to the location where you saved it then right click the file Now close the registry editor\nThen click on \"Open with\" --> Notepad After that click \"Ctrl\" + \"H\" A replace window should pop up In \"Find what\" type \"Speech Server\\v11.0\" In \"replace with\" type \"Speech\" Then click replace all Then save and close the file Then open the same file with \"Registry Editor\" Click yes on both pop ups Then click ok Now press the \"windows\" key and \"R\" key simultaneously A run window should pop up. Click on the run box and type \"regedit\" and click enter, click \"yes\" and proceed. A registry editor should pop up.\nNow you would be seeing \"Voices\" If you look a little higher up you should see \"Speech Server\" And just on top of that is \"Speech\" Open \"Speech \" by double clicking it Under \"Voices\" and \"Tokens\" you should see your newly installed voice. Now, you are ready now test your code to check if it works correctly If you have any problems with code please tell here","Q_Score":1,"Tags":"python,python-3.x,windows-10,chatbot,pyttsx","A_Id":63867818,"CreationDate":"2020-07-06T12:33:00.000","Title":"pyttsx3 module is not showing all installed voices","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"The app that I'm creating is a single page questionnaire. The questions displayed are changed by the press of a button that also saves the answers given in a django form in my database. Through using ajax and Javascript I made it possible to do this without refreshing the page. However the answers are not coupled to the questions in the database. What is the best way to save these questions in the database as well?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":25,"Q_Id":62761364,"Users Score":0,"Answer":"The best way to go here probably would be to store the questions in a database table (e.g. questions) with question id and question text, then store all possible answers for question in another table (e.g. answers) in which there would be answer id, parent question id and answer text.\nThis would ensure some kind of database structure that would allow us to find questions and answers by some kind of numbers.\nThen in the view we would loop through all questions and in each question loop through each answer, rendering it. In the HTML forms or JS buttons each question and answer would have a unique ID combination. Upon answering the question by selecting a specific answer, instead of sending the actual text of question or answer, we would send the id of answer.\nThe user answer could be saved in a table user_answers where it would store some kind of user id together with the id of answer. Afterwards all user answers could be acquired through a SQL query, actual answers could be joined to them and we could see which user answered to which question with which answer. :)\nHope this helps!","Q_Score":0,"Tags":"javascript,python,django,ajax,database","A_Id":62762183,"CreationDate":"2020-07-06T17:27:00.000","Title":"What is the best way to store javascript generated innerhtml in the database?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm fairly new to python, and I am trying to run the code I wrote when I right click the playback range windows in the timeline of maya (where you type your min or max range) . I managed to find ways to run scripts within the attribute editor \/ timeline \/ shelf items, but I cant seem to figure out how to interact with Maya's UI... Even typing a new value in there doesn't update the script editor, so I don't really have a lead on where to go. Any help would be fantastic!","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":115,"Q_Id":62765813,"Users Score":0,"Answer":"Everything Maya does when using the UI logs data in the script editor.\nMany items in the log are suppressed though as it would spam the log.\nTo enable it, activate Echo all commands (can be found in script editor under History), then clear the script editor and perform the action you want logged.\nYou will find that Maya executes a lot of mel script functions, which you can all find in the maya install directory under [MAYA_INSTALL_DIR]\/scripts\/startup and [MAYA_INSTALL_DIR]\/scripts\/others\nTo find the essential function you will have to search a little through the log.\nOnce you got a mel function you want to look for, I recommend using a find in files search function like the one in Notepad++, to find the corresponding .mel file in which the global proc is defined.\nAlso note that UI element names that are logged in script editor may have a different name the next time you start maya. So you will have to add functionality to search for the correct UI element name.\nThe Maya mel scripts are a good resource to find out all sorts of things about how the UI works, including contextual marking menus and the commands of tool windows.","Q_Score":1,"Tags":"python,user-interface,maya","A_Id":62950358,"CreationDate":"2020-07-06T23:13:00.000","Title":"Run a script in Maya by right clicking UI?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"what can I do if I want to collectstatic again in pythonanywhere? I did it because I remove oneline in my remote repository and when I collectstatic it didn't work (new styles don't apply) so what can I do?\nI'm not an speaker of English.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":30,"Q_Id":62768194,"Users Score":1,"Answer":"You should check whitenoise. It helps in maintaining static files in deployment  in django.","Q_Score":0,"Tags":"javascript,python,html,css,django","A_Id":62789163,"CreationDate":"2020-07-07T04:33:00.000","Title":"About Django and static files in deployment from pythonanywhere","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I was wonder what if i had 1 million users, how much time will take it to loop every account to check for the username and email if the registration page to check if they are already used or not, or check if the username and password and correct in the log in page, won't it take ages if i do it in a traditional for loop?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":50,"Q_Id":62775839,"Users Score":1,"Answer":"Rather than give a detailed technical answer, I will try to give a theoretical illustration of how to address your concerns. What you seem to be saying is this:\n\nLinear search might be too slow when logging users in.\n\nI imagine what you have in mind is this: a user types in a username and password, clicks a button, and then you loop through a list of username\/password combinations and see if there is a matching combination. This takes time that is linear in terms of the number of users in the system; if you have a million users in the system, the loop will take about a thousand times as long as when you just had a thousand users... and if you get a billion users, it will take a thousand times longer over again.\nWhether this is a performance problem in practice can only be determined through testing and requirements analysis. However, if it is determined to be a problem, then there is a place for theory to come to the rescue.\nImagine one small improvement to our original scheme: rather than storing the username\/password combinations in arbitrary order and looking through the whole list each time, imagine storing these combinations in alphabetic order by username. This enables us to use binary search, rather than linear search, to determine whether there exists a matching username:\n\ncheck the middle element in the list\nif the target element is equal to the middle element, you found a match\notherwise, if the target element comes before the middle element, repeat binary search on the left half of the list\notherwise, if the target element comes after the middle element, repeat binary search on the right half of the list\nif you run out of list without finding the target, it's not in the list\n\nThe time complexity of this is logarithmic in terms of the number of users in the system: if you go from a thousand users to a million users, the time taken goes up by a factor of roughly ten, rather than one thousand as was the case for linear search. This is already a vast improvement over linear search and for any realistic number of users is probably going to be efficient enough. However, if additional performance testing and requirements analysis determine that it's still too slow, there are other possibilities.\nImagine now creating a large array of username\/password pairs and whenever a pair is added to the collection, a function is used to transform the username into a numeric index. The pair is then inserted at that index in the array. Later, when you want to find whether that entry exists, you use the same function to calculate the index, and then check just that index to see if your element is there. If the function that maps the username to indices (called a hash function; the index is called a hash) is perfect - different strings don't map to the same index - then this unambiguously tells you whether your element exists. Notably, under somewhat reasonable assumptions, the time to make this determination is mostly independent from the number of users currently in the system: you can get (amortized) constant time behavior from this scheme, or something reasonably close to it. That means the performance hit from going from a thousand to a million users might be negligible.\nThis answer does not delve into the ugly real-world minutia of implementing these ideas in a production system. However, real world systems to implement these ideas (and many more) for precisely the kind of situation presented.\nEDIT: comments asked for some pointers on actually implementing a hash table in Python. Here are some thoughts on that.\nSo there is a built-in hash() function that can be made to work if you disable the security feature that causes it to produce different hashes for different executions of the program. Otherwise, you can import hashlib and use some hash function there and convert the output to an integer using e.g. int.from_bytes. Once you get your number, you can take the modulus (or remainder after division, using the % operator) w.r.t. the capacity of your hash table. This gives you the index in the hash table where the item gets put. If you find there's already an item there - i.e. the assumption we made in theory that the hash function is perfect turns out to be incorrect - then you need a strategy. Two strategies for handling collisions like this are:\n\nInstead of putting items at each index in the table, put a linked list of items. Add items to the linked list at the index computed by the hash function, and look for them there when doing the search.\n\nModify the index using some deterministic method (e.g., squaring and taking the modulus) up to some fixed number of times, to see if a backup spot can easily be found. Then, when searching, if you do not find the value you expected at the index computed by the hash method, check the next backup, and so on. Ultimately, you must fall back to something like method 1 in the worst case, though, since this process could fail indefinitely.\n\n\nAs for how large to make the capacity of the table: I'd recommend studying recommendations but intuitively it seems like creating it larger than necessary by some constant multiplicative factor is the best bet generally speaking. Once the hash table begins to fill up, this can be detected and the capacity expanded (all hashes will have to be recomputed and items re-inserted at their new positions - a costly operation, but if you increase capacity in a multiplicative fashion then I imagine this will not be too frequent an issue).","Q_Score":2,"Tags":"python,algorithm,sorting,web,data-structures","A_Id":62777412,"CreationDate":"2020-07-07T12:57:00.000","Title":"what the fastest method to loop through a very large number of account in a log in page","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have deployed a Django app in namecheap shared hosting. All the page and functions are working fine except file upload. File upload from django-admin(return 404 page) and custom file upload form (render root page view) is not working. I have tried with flask app and file upload is working fine. All settings about media is ok.\nI have contacted with namecheap support. But, they want specific problem which i can't find out.\nI got similar  type  question in stackoverflow and other forum but nobody has replied.\nThank in advance.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":172,"Q_Id":62777863,"Users Score":0,"Answer":"I want to answer of my above question.\nThe issue was about Mod_Security. Need to disable it. I have figured out by talking with namecheap customer care and it's working fine.","Q_Score":0,"Tags":"python,django,apache,shared-hosting,namecheap","A_Id":64548581,"CreationDate":"2020-07-07T14:44:00.000","Title":"django-admin file upload return 404 page in shared hosting (namecheap)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm starting to use Google Cloud Dataflow for batch and streaming processing. The jobs being developed are mostly for ingesting data from different sources (MySQL, Kafka, and file systems), cleansing them, do some streaming and bath aggregation, and writing back to Google Cloud Storage.\nGiven these tasks, are there any recommendations for using the Java SDK or Python SDK for writing the jobs? Any noticeable differences in terms of performance and features between them?\nFor example, I noticed that for the Java SDK, the built-in I\/O PTransform JdbcIO is available. This PTransform reads and writes data on JDBC, and this is not available in the Python SDK (so far). Is it possible to use the Java SDK only to create a pipeline that reads from a MySQL database and writes to Google Cloud Storage, while for the other pipelines use a different SDK (e.g. Python)?\nThanks in advance for your time!","AnswerCount":2,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":1112,"Q_Id":62778682,"Users Score":2,"Answer":"I would go ahead with java SDK as the features and external connectors are more in java. But python SDK is also catching up.\nAs far as performance considerations are concerned when we submit a beam job to dataflow, the job steps will be sent in an API call to the google cloud dataflow. Hence, I think there's no significant difference in performance as far as dataflow is concerned","Q_Score":0,"Tags":"java,python,google-cloud-platform,google-cloud-dataflow,apache-beam","A_Id":62778787,"CreationDate":"2020-07-07T15:27:00.000","Title":"Google Cloud Dataflow - Java SDK vs Python SDK","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I have a server which continuously sends data block (sample) at a sampling rate of 100Hz. My client receives it and performs some calculation on the sample to visually display a real-time tracking and then receives the next sample and so on. The time taken for it to receive and calculate until the next sample is received is 0.1s.\nThis means that I am missing on the in between samples, if I am not wrong. How can change the code such that I receive 'all samples' and perform the calculation in order to enable a real-time tracking?\nThank you in advance!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":231,"Q_Id":62779087,"Users Score":0,"Answer":"From the comment section:\n\nThe server is a software from where I am receiving the samples. And the manual of the software says the sampling rate of the samples is 100Hz. My client code receives it and checks if the data within the sample is above the threshold value or not and displays an error on the screen when it is. To be able to check for every sample that is being streamed by the software, my receiving and computation must be faster. Could you explain how could I use buffer to better my case? I am sorry if my question is very silly. But this is my first attempt in TCP programming as well as Python\n\nFor a sampling rate of 100 Hz the network latency has to be below 10ms.\nFirst test: Determine the network latency...\nOnly receive the data and log the times (including milliseconds) to a file. If you have gaps of more than 10ms between the datapackets, the network is probably not fast enough.\nIf the gaps are far below the 10ms, data processing is too slow.\nServer-side buffering (high latency):\nIf you can change the server, consider sending multiple packets at once, but at a slower frequency. The client would have more time to process the data instead of waiting for the I\/O.\nClient-side buffering (low latency):\nIf the server sends packets faster than you can process them, consider a FIFO buffer for the client. Incoming data is appended to the buffer, while processing code fetches its packets from the queue, ideally simultaneously.\nLastly, some warm words of warning: You [say you] are new to a programming language and network programming - it's probably too early for a realtime data processing project and I would suggest to start with a simpler projects for training purposes...","Q_Score":0,"Tags":"python,tcp,runtime,client-server,rate","A_Id":62780063,"CreationDate":"2020-07-07T15:48:00.000","Title":"Server sending data at a sampling rate 100 Hz and the client receiving and processing time is around 0.1s using Python","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm looking for a way to scan a website and instantly detect an update, without having to refresh the page. So when a new post is pushed to the webpage, I'd like to be instantly notified. Is there a way to do that without having to refresh the page constantly?\nCheers","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":65,"Q_Id":62780541,"Users Score":1,"Answer":"What browser are you using? Chrome has an auto refresh extension. Try doing a Google search for the extension. It's very easy to set up. It's more of a timed refresh that you can program. But it works for situations like what you are asking.","Q_Score":1,"Tags":"python,html,jquery,google-chrome","A_Id":62780663,"CreationDate":"2020-07-07T17:13:00.000","Title":"How to get notified when new content is pushed to a webpage","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm looking for a way to scan a website and instantly detect an update, without having to refresh the page. So when a new post is pushed to the webpage, I'd like to be instantly notified. Is there a way to do that without having to refresh the page constantly?\nCheers","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":65,"Q_Id":62780541,"Users Score":1,"Answer":"Without knowing a bit more about your task, it's hard to give you a clear answer. Typically you would set up some kind of API to determine if data has been updated, rather than scraping the contents of a website directly. See if an API exists, or if you could create one for your purpose.\nUsing an API\nWrite a script that calls the API every minute or so (or more often if necessary). Every time you call the API, save the result. Then compare the previous result to the new result - if they're different then the data has been updated.\nScraping a Website\nIf you do have to scrape a website, this is possible. If you execute an HTTP GET request against a webpage, the response will contain the DOM of the webpage. You can then traverse the DOM to determine the contents of a webpage. Similar to the API example, you can write a script that executes the HTTP request every minute or so, saves the state, and compares it to the previous state. There are numerous libraries out there to help preform HTTP request and traverse the DOM, but without knowing your tech stack I can't really recommend anything.","Q_Score":1,"Tags":"python,html,jquery,google-chrome","A_Id":62780866,"CreationDate":"2020-07-07T17:13:00.000","Title":"How to get notified when new content is pushed to a webpage","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Do I need to install virtualenv for every different django project that I make or should I just go straight to creating a virtualenv after I installed it in the first project?","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":58,"Q_Id":62787856,"Users Score":1,"Answer":"The best way is to create a separate virtual environment for each project. So that you can avoid python package dependency issues.","Q_Score":2,"Tags":"python,django,pycharm","A_Id":62787883,"CreationDate":"2020-07-08T04:58:00.000","Title":"Creating a project with Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"Do I need to install virtualenv for every different django project that I make or should I just go straight to creating a virtualenv after I installed it in the first project?","AnswerCount":2,"Available Count":2,"Score":0.0996679946,"is_accepted":false,"ViewCount":58,"Q_Id":62787856,"Users Score":1,"Answer":"So first try to understand the definition of Virtual environment,\" a self-contained directory tree\". Now you can create different Virtual environments, What I prefer doing is using a virtual environment based on their uses, like if one virtual environment has all the basic requirments, i don't have to create another one.","Q_Score":2,"Tags":"python,django,pycharm","A_Id":62788693,"CreationDate":"2020-07-08T04:58:00.000","Title":"Creating a project with Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a jupyter notebook that accepts user-input via the input() python function. It then takes the input and uses it to a run a model and then outputs\/plots the result. Is there a way to create a web-app that does this? Of course, the web-app must also accept user-input and have access to my model.","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":525,"Q_Id":62795661,"Users Score":0,"Answer":"It doesn't work like that. If you want to make a web app, you'll make GUI with html\/css for taking input and displaying output. Your python code will work as the backend of the application. You can use a python framework like flask to make things easier.","Q_Score":1,"Tags":"python,machine-learning,web-applications,jupyter-notebook","A_Id":62795723,"CreationDate":"2020-07-08T13:13:00.000","Title":"Is there a way to make a web app from a jupyter notebook?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm designing a Flask app that graphs some weather data for several cities. It makes sense to me to use a \"City\" class that handles the fetching and parsing of the data every time the page is loaded. However, what I'm not sure about is how Flask would handle these instances. Is Flask \"smart\" enough to know to release the memory for these instances after the page is served? Or will it just gradually consume more and more memory?\nAlternatively, would I just be able to create a single global class instance for each city OUTSIDE of the \"@app.route\" functions that I could use whenever a page is requested?\nThe deployment server will be Windows IIS using FastCGI, in case that matters at all.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":61,"Q_Id":62801658,"Users Score":1,"Answer":"Flask is \"just\" a framework. It is still executed and managed by the \"normal\" Python interpreter so the question \"how Flask would handle these instances\" is nonexistent.\nDefine classes and use their instances as you would in any other Python project\/snippet, however it might be beneficial to think where to define them.\nIt will not make sense inside a route since the class will be redefined every time a request is received, but the how is exactly the same.","Q_Score":0,"Tags":"python,python-3.x,flask","A_Id":62801944,"CreationDate":"2020-07-08T18:47:00.000","Title":"Can I use python3 classes inside a Flask app?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"We have an existing python\/flask app (made by someone else) that has a nav bar, sidebar and different pages. We have built a create-react-app project that we want to sit on one of these pages in the python\/flask app.\nThe question is - how can we integrate our react app into the existing python\/flask codebase?\nAny help gratefully received!\nUpdate: from helpful answer below - could anyone help with explaining this a little more - perhaps with code examples? \"render a container in the same template that react can mount on.\"\nUpdate 2: Someone else suggested \"You can have React run anywhere where you can add a script tag into HTML and a DOM element to attach it to. As long as you have a way to bundle and serve the JS files, you should just be able to include your new app like that.\" - could anybody help with code examples of this?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":248,"Q_Id":62812420,"Users Score":0,"Answer":"A rough outline would be:\n\nconfigure the build folder to be the folder where static files are served from by your server (js, css, ...)\ninclude the files from that folder in the template of the page your want your react app to display (via <link> and <script> tags).\nrender a container in the same template that react can mount on.","Q_Score":0,"Tags":"python,reactjs,flask","A_Id":62812631,"CreationDate":"2020-07-09T10:04:00.000","Title":"How to insert create-react-app project into existing python\/flask app","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm working on a question and answer system with django. my problem : I want the app to get a question from an ontology and according the user's answer get the next question. how can I have all the questions and user's answers displayed. i'm new to django, I don't know if I can use session with unauthenticated user and if I need to use websocket with the django channels library.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":85,"Q_Id":62813362,"Users Score":1,"Answer":"Given that you want to work with anonymous users the simplest way to go is to add a hidden field on the page and use it to track the user progress. The field can contain virtual session id that will point at a model record in the backend, or the entire Q\/A session(ugly but fast and easy). Using REST or sockets would require similar approach.\nI can't tell from the top of my mind if you can step on top of the built in session system. It will work for registered users, but I do believe that for anonymous users it gets reset on refresh(may be wrong here).","Q_Score":0,"Tags":"python,django,session,django-channels","A_Id":62817060,"CreationDate":"2020-07-09T10:59:00.000","Title":"user interaction with django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am trying to scrape data from a mobile application (Pokemon HOME). The app shows usage statistics and other useful statistics that I want to scrape. I want to scrape this on my computer using python.\nI am having trouble determining how to scrape data from a mobile application. I tried using Fiddler and an Android emulator to intercept server data but I am unfamiliar with the software to be able to understand what exactly to do.\nAny help would be very beneficial. Even just suggestions for resources where I can learn how to do this on my own. Thank you!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1891,"Q_Id":62824513,"Users Score":0,"Answer":"It's possible but it's really a hard nut to break. There's a huge difference between Mobile app and web app\nWeb app is accessible through WAN ,v.i.z World area network. Scraping is fairly and squarely easier.\nIn Python, you can bs4 to do it.\nBut in Mobile app, essentially and effectively, it's more about LAN.\nIt's installed locally.\nInstall an app to remote control your device from another device (usually required root)\nHowever, whole data might not be available.","Q_Score":0,"Tags":"python,web-scraping,mobile,fiddler,scrape","A_Id":62824677,"CreationDate":"2020-07-09T22:14:00.000","Title":"How do I use external applications to scrape data from a mobile app?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"What are the different ways to automate the AWS Glue workflow, I've data in AWS S3,now I've to automate the AWS Glue workflow (that does the Amazon Forecast and write back the results to AWS S3)","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":363,"Q_Id":62827456,"Users Score":1,"Answer":"You can add a trigger in the aws workflow which provides you with three options\n\nUsing Events as a trigger, where events can be any cloudwatch event. So you can setup something like as soon as file arrives in s3 trigger the workflow.\nUsing time based schedule,, this will trigger the job at the desired time on the desired interval.\nOn demand, trigger the workflow whenever required.\n\nAlternatively you can also use step functions to automate your glue jobs.","Q_Score":0,"Tags":"python-3.x,amazon-web-services,amazon-s3,aws-glue,amazon-forecast","A_Id":62828920,"CreationDate":"2020-07-10T04:41:00.000","Title":"Automate the AWS Glue workflow","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm looking for a good solution to implement a handshake between a python backend server and a react frontend connected through a websocket.\nThe frontend allows the user to upload a file and then send it to the backend for processing. Now it might be possible that the processing encounters some issues and likes the user's confirmation to proceed or cancel - and that's where I'm stuck.\nMy current implementation has different \"endpoints\" in the backend which call then different function implementations and a queue which is continuously processed and content (messages) is sent to the frontend. But these are always complete actions, they either succeed or fail and the returned message is accordingly. I have no system in place to interupt a running task (e.g. file processing), send a request to the frontend and then wait for response before I continue the function.\nIs there a design pattern or common approach for this kind of problem?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":43,"Q_Id":62828807,"Users Score":0,"Answer":"How long it takes to process? Maybe a good solution is set up a message broker like RabbitMQ and create a queue for this process. In the front-end you have to create a panel to see the state of the process, which is running in an async task, and if it has found some issues, let the user know and ask what to do.","Q_Score":0,"Tags":"python,reactjs,websocket,system-design","A_Id":62829294,"CreationDate":"2020-07-10T06:54:00.000","Title":"Interupt backend function and wait for frontend response","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a website for work and I need to go through a list of numbers and determine if the user associated with the number is still active. The website requires a sign in so I can't use requests. Is there a way I can run it through my chrome browser to get the information I require?\nIf I can get the HTML then I am fine from there onward with the code.\nAny help would be greatly appreciated","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":34,"Q_Id":62844688,"Users Score":0,"Answer":"Can I have the webpage you are trying to access?","Q_Score":0,"Tags":"python,python-3.x,web-scraping","A_Id":63064700,"CreationDate":"2020-07-11T02:49:00.000","Title":"Is there a way to get HTML text through python and a web browser?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"When we start a new project, we are provided with a urls.py file. However, when we create apps within our project, Django doesn't provide the urls.py file for us and we are expected to create it manually. What is the exact logic\/reason behind that? Are there even apps that don't necessarily have to have urls.py file?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1119,"Q_Id":62846380,"Users Score":6,"Answer":"First you have your project urls.py. This file is the starting point for django to look up if a certain url path exists.\nWhen you use more than one app you normally tell django to look up their urls.py files after the project urls.py. So in this case creating a app-related urls.py makes sense in order to overview the entire url structure of your project divided into your apps.\nWhen you use only one app it is actually not neccessary to have an app-related urls.py file because you dont have to bother about the entire url structure. You only use one app so the url is related to that app.\nNormally you create a urls.py file even if you only have one app. This can have multiple reasons. But django lets you make this choice. First you dont know if you will add more apps in the future so you better already create a tidied up file structure from the beginning. Second because of the model-view-controller (django actually has a model-view-template structure) built-up you want to keep your views, models and paths together. It is much more cleaner and will help you in case your project grows up.\nHope it gets a little clearer and helps you a little bit.","Q_Score":5,"Tags":"python,django,url","A_Id":62846568,"CreationDate":"2020-07-11T07:29:00.000","Title":"Why Django doesn't provide a urls.py file for apps?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to use PostgreSQL as my database in my Django project(my os is windows). I can't run PostgreSQL's commands in the command prompt while venv is activated and out of venv I have access to those commands because I've added PostgreSQL bin directory path to the PATH environmental variable. How can I do this with virtualenv so I can run those commands inside virtualenv?\nThank you.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":200,"Q_Id":62849692,"Users Score":0,"Answer":"you can open a second cmd\nand use it for Postgre","Q_Score":0,"Tags":"django,windows,postgresql,python-venv","A_Id":62849993,"CreationDate":"2020-07-11T13:20:00.000","Title":"PostgreSQL commands not working in virtualenv","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How would one check the number of \"active users\", i.e. number of users having the web page open in browser at any given time in a Dash web application?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":487,"Q_Id":62854394,"Users Score":0,"Answer":"There are a number of ways to achieve this.\nFirstly the more robust approach would be to leverage the auth service you probably already setup so that users are correctly permissioned (a request to a token service would identify each user). After this you can record the initial site load by inserting an entry into a backend database.\nYou don't need to use an auth service of course you could just record the users IP address and insert into the database\nIf you wanted to know who is using your web app at any given time then one approach would be to add an interval timer callback which would add these entries to the database along with the access time","Q_Score":3,"Tags":"python,web-applications,plotly-dash","A_Id":62859400,"CreationDate":"2020-07-11T20:44:00.000","Title":"How to check number of active users in Dash app?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"This error occurred while installing latest Ruby using ruby-install.\nWhat I tried:\nbrew switch openssl <my_version>\nbrew upgrade openssl\nAnd many other solutions that were proposed in SO. None solved my problem.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":122,"Q_Id":62857132,"Users Score":0,"Answer":"So the problem is actually coming that python2 is not supported, but you can solve it by installing just correct openssl via brew, e.g.\nbrew install openssl@1.1","Q_Score":0,"Tags":"python,openssl,homebrew,python-2.x","A_Id":71038397,"CreationDate":"2020-07-12T04:37:00.000","Title":"Python\/OpenSSL issue: ERROR:root:code for hash md5 was not found","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to build my first website, a little RP game to play in school. It is a hero who plays an adventure and must make the right decisions.\nIn my program I have a model for each component: hero, NPC, trap, obstacle, closure ... all of which have a generic relation with an Interaction class.\nIt would be simpler for me to have only a global interaction class which includes all the necessary attributes. In each instance it would suffice for me to specify what type of interaction it is and to fill in only the attributes concerned.\nBut then I will end up with instances containing most of the time many empty fields.\nIs it a problem? Bad practice?\nThx !","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":20,"Q_Id":62858018,"Users Score":0,"Answer":"Yes it is not a good idea. Because each time you make an instance from your class it reserve that much memory even if you don't fill all the fields and in the long term your app performance will decrease.","Q_Score":0,"Tags":"python,django","A_Id":62858332,"CreationDate":"2020-07-12T06:57:00.000","Title":"Model that combines all the attributes (which will sometimes be useless) or several small models?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"why we should openfaas instead of lambda functions in AWS or other serverless functions by cloud service providers?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":76,"Q_Id":62866325,"Users Score":1,"Answer":"The idea is to avoid lock-in to a specific vendor. With Open Faas you can run wherever you want while AWS Lambda is tied to AWS.","Q_Score":0,"Tags":"python,amazon-web-services,azure,google-cloud-functions,openfaas","A_Id":62866524,"CreationDate":"2020-07-12T20:50:00.000","Title":"OpenFaas vs serverless functions provided by cloud service providers","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have the following OF to minimize the cost of supply chain:\nmdl.minimize(mdl.sum((cs+ch+cf+cv*d[j])*q[j] for j in arcs) + mdl.sum(\u03b1*(eh+et*d[j])*q[j] for j in arcs) + mdl.sum(\u03b2*(gh+gt*d[j])*q[j] for j in arcs) + mdl.sum(X[f]*cjf for f in comb))\nWhere cs, ch, cf, cv, eh, et, gh, gt, cjf, \u03b1 and \u03b2 are a series of constant parameters.\nd[j] is the distance between origin iand destination j that are combined in a list of arcs or tuples.\nq[j] is the flow variable between origin i and destination j in arcs.\nX[f] is a binary variable to open a facility in destination j with capacity f, the possible combinations  of j and f are listed in comb.\nThe first constraint 1 ensures the flow q[i,j] from origin i does not exceed its maximum availability of material dQ in i. D[(i, j)] is a binary parameter that is 1 if the distance between origin i and destination j is less or equal than a treshold value, else the value of D[(i, j)] is 0. (This parameter helps us to limit the transport distance.)\nfor i in I: mdl.add_constraint(mdl.sum(q[(i, j)]*D[(i, j)] for j in J) <= Qi[i])\nThe second constraint 2 ensures the flow q[i,j] to a destination j equals the capacity of the opened facility in destination j with capacity f.\nfor j in J: mdl.add_constraint(mdl.sum(q[(i, j)]for i in I) == mdl.sum(X[(j,f)] for f in F))\nBut then, we want another constraint 3 that ensures the sum of capacities f in the facilities opened at destinations j has to be as close as possible to the total demand of capacities E. Let's say there is an energy demand of 100 MW E = 100, then we want to reduce the cost in OF of the supply but also make sure we reach the demand E. Otherwise minimizing the cost would be 0. This constraint can be formulated like:\nmdl.add_constraint(mdl.sum(X[j,f]for j in J for f in F) == E)\nUnfortunately, this solution is never feasible. If we replace == by <= than it is feasible, but it is at minimal cost and the capacity is nowhere near maximal.\nWe don't need this to be a strict constraint but we do wanna get as close to E as possible, by opening multiple facilities at destinations j with different capacities f. (Eg. we could have one destination with 20 MW, one at 5 MW, two at 30 MW and another at 15 MW to reach 100 MW by opening 5 destinations)\nOne way is to force the model to open N number of locations j, however, we have a set of 128 locations. To find the minimum cost and maximum capacity from a ranges of scenarios from N=1 to N=128 means we need to run this model 128 times.\nOn top of the above-mentioned constraint we have 3 additional constraints:\n\nWe can only select destination j to built a facility and open it at only one capacity f.\nThe sum of destinations j to open is greater than 0.\nThere is no negative flow q between origins i and destinations j\n\nIs there a way to:\n\nMake constraint 3 less binding, but still try to reach E while keeping the cost minimal?\nReformulate the OF to combine the minimized cost with the maximized capacity?\n\nImportantly we do not want to run the model 128 times. We want to model to select the destinations j to open a facility and select the capacity f accordingly, to minimize the overall cost of supply and maximize the installed capacity. In our case,e it would also be very unlikely to open just one destination j to satisfy all demand E. Instead we would have multiple j with smaller f capacity that approach E when summed.","AnswerCount":3,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":531,"Q_Id":62867607,"Users Score":0,"Answer":"This is 'multi-objective optimisation'. Two possible ways to achieve this are outlined below.\nFirst approach is to get a combined single objective function. This is easier if both terms are working in the same direction e.g. both are minimising terms. So for your 'constraint 3' try using a term in the objective for the shortfall relative to the demand, so the shortfall is something like:\nShortfall == E - mdl.sum(X[j,f]for j in J for f in F)\nThen add the shortfall into the objective, and use some weighting factors for the two terms, e.g.:\nw * Cost + (1-w) * Shortfall\nThen if w is one, you are just minimising the cost, while if w is zero, you are just minimising the shortfall. Of course, if you use a value for the weighting between zero and one, then you will get a balance of the two objectives. You will need to pay careful attention to the value of the weighting split between your two terms.\nA variation in this approach would be to give a much bigger weight to one term than the other, so that term dominates the objective. Then the solver will try to minimise that more important term (e.g. the shortfall), and the other term will help select the lower cost options for achieving that. In practice this often does NOT work as well as people expect - adding very large and very small terms in the objective can give rise to numerical issues in the solver, and often the real differences in the objective values of different solutions can get lost in the tolerances in the solver anyway. For example we have seen some people use relative weights of 1 million to one, while still using an optimality gap of 1e-6; in this case the second term effectively gets lost in the noise because many (perhaps very different) alternatives look almost the same to the solver and fall within the tolerances and so effectivley get ignored.\nThe second approach is 'lexical multi-objective' solving which is a little more complicated, but doesn't rely on some troublesome weighting factors. Effectively you need to solve your problem twice - once to find the maximum capacity that you can provide, and then fix that with a constraint in your second problem and minimise the cost of delivering that capacity.\nIn practice you might adjust this purist approach, and accept solutions in your second model that are close enough to achieving the maximum capacity. So for example you may fix the total capacity in your second model to be e.g. at least 99% of the calculated maximum capacity achievable from the first model. This reflects the cases where there are maybe only a few (expensive) ways to achieve the absolute maximum capacity, but there may be worthwhile savings if we explore solutions that are close to that maximum.\nNote that there are several solvers that provide ready-built support for multi-objective models using this 'lexical' approach which may avoid you explicitly solving the model twice for each case.","Q_Score":0,"Tags":"python,mathematical-optimization,cplex,docplex,docplexcloud","A_Id":62871035,"CreationDate":"2020-07-13T00:00:00.000","Title":"How to combine 2 constraints to minimise cost and maximise capacity using DOcplex.mp in Python","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I Am using Scrapy with scrapySelenium but the scrapy selenium starts with a headless browser but for some purpose i need to start it with head so i can keep seeing what my scrapy does in the browser how to turn off headless arguments passed in settings of scrapy\nthis is what i copied in the settings it is headless as you can see but want to see the browser open up with Scrapy Selenium is there anyway\nfrom shutil import which\nSELENIUM_DRIVER_NAME = 'chrome'\nSELENIUM_DRIVER_EXECUTABLE_PATH = which('chromedriver')\nSELENIUM_DRIVER_ARGUMENTS=['-headles']  # '--headless' if using chrome instead of firefox","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1744,"Q_Id":62870900,"Users Score":2,"Answer":"Delete the SELENIUM_DRIVER_ARGUMENTS = ['--headless'] from the settings.py.\nWith selenium webdriver you can pass arguments and this argument makes sure that it is a headless browser.","Q_Score":1,"Tags":"python,selenium,selenium-webdriver,web-scraping,scrapy","A_Id":62872252,"CreationDate":"2020-07-13T07:13:00.000","Title":"How to use chrome driver with head in Scrapy Selenium","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm trying to connect a bluetooth device (ESP32, peripheral) with Web Bluetooth (central). I send an addvertising packet and I can see the device on the web page, but I fail to connect to it. My code for the ESP32 looks like this: (MicroPython)\nble.gap_advertise(interval_us=100, adv_data=bytearray(b'\\x02\\x01\\x06\\x06\\x08\\x45\\x53\\x50\\x33\\x32\\x11\\x07\\x26\\x6c\\x34\\x7f\\xb2\\x38\\x61\\x82\\xbe\\x4d\\x1d\\x64\\xf1\\xf7\\x93\\x16\\x02\\x19\\x80'),resp_data=None, connectable=True)\nIn Web Bluetooth (JavaScript) I just request a device and try to connect to the gatt.\nCan anyone help me out?\nThanks in advance!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":216,"Q_Id":62872924,"Users Score":0,"Answer":"The JavaScript does work with another bluetooth peripheral. (RN4678)\nAnd in JavaScript I can find the peripheral (ESP32) after filtering, but I can't connect to it.\nJavaScirpt:\nserver = await device.gatt.connect()\nThe code stops at that point.\nMicroPython:\nThe GATT is defined using:\nble.gatts.register.services() \nI'm trying to use my own service, not a SIG defined one. So I advertise b'(x...') which contains the flags, the service and the device name. And it works with the nRF Connect App. I can send and recive data. But it doesn't work with the bluetooth enabled web browser.\nThanks for your help!","Q_Score":0,"Tags":"bluetooth,esp32,micropython","A_Id":62876187,"CreationDate":"2020-07-13T09:25:00.000","Title":"Connecting to Web Bluetooth","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am basically working on a NodeJS app that has some buttons and on clicking them I run some python machine learning and deep learning models but the problem is that I cant install basic python libraries like numpy. Also as soon as I add python build pack to my app it stops running. The logs show that there is no web process. I found in docs that we have to insert a Procfile.txt with npm commands but that also didn't solve the problem.\nThe whole setup runs perfectly on the local machine.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":379,"Q_Id":62882871,"Users Score":0,"Answer":"@Vladim Hulevich Thanks for replying. But I ran it like this only and it works like a charm on my local machine but when I run my script on heroku it produces error of numpy not found. But my app is basically nodejs so I only added nodejs buildpack and not python as when I add python buildpack my nodejs app also stops running","Q_Score":2,"Tags":"javascript,python,heroku","A_Id":62883004,"CreationDate":"2020-07-13T19:23:00.000","Title":"How to run python script from nodejs on heroku","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using Flask as backend and React as frontend in my application. The application deals with large amounts of data (millions of rows).\nWhen I send the data from backend (stored in a dataframe in python) to frontend, it is in JSON format and is quite fast. But is JSON format stable enough to hold million rows of data?\nAre there any ideal data structures for large data like datatables or dataframes which makes it easier to access rows and columns similar to pandas dataframe in javascript or reactJS?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":189,"Q_Id":62897005,"Users Score":0,"Answer":"try using lazyloading. It helps you get data on scroll","Q_Score":0,"Tags":"javascript,python,reactjs,flask,data-structures","A_Id":62898196,"CreationDate":"2020-07-14T14:03:00.000","Title":"Ideal data structure to hold a large tables in ReactJS","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am using Flask as backend and React as frontend in my application. The application deals with large amounts of data (millions of rows).\nWhen I send the data from backend (stored in a dataframe in python) to frontend, it is in JSON format and is quite fast. But is JSON format stable enough to hold million rows of data?\nAre there any ideal data structures for large data like datatables or dataframes which makes it easier to access rows and columns similar to pandas dataframe in javascript or reactJS?","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":189,"Q_Id":62897005,"Users Score":0,"Answer":"Sending millions of rows to frontend and doing analysis in the frontend is not very adequate. Instead you can apply your bi logic in the backend and send results to frontend.","Q_Score":0,"Tags":"javascript,python,reactjs,flask,data-structures","A_Id":62899647,"CreationDate":"2020-07-14T14:03:00.000","Title":"Ideal data structure to hold a large tables in ReactJS","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a flask site. It's specifically a note app. At the moment I am storing the user notes as plaintext. That means that anyone with access to the server which is me has access to the notes. I want to encrypt the data with the user password, so that only the user can access it using their password, but that would require the user to input his\/her password each time they save their notes, retrive the notes or even updates them. I am hashing the password obviously.\nAnyone has any idea how this could be done?","AnswerCount":2,"Available Count":1,"Score":-0.0996679946,"is_accepted":false,"ViewCount":638,"Q_Id":62903682,"Users Score":-1,"Answer":"Use session to store user information, the Flask-Login extension would be a good choice for you.","Q_Score":1,"Tags":"python-3.x,flask,flask-sqlalchemy","A_Id":62905809,"CreationDate":"2020-07-14T20:41:00.000","Title":"How to encrypt data using the password from User","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"tl;dr: Is Spring + Django back-end possible?\nWhen I was new to industry and was still working my way around the office, I got interested in Django and created a very small, basic-level application using the framework. When I got to meet my team after a few weeks, they said to go for Spring framework. After spending half a year on the framework and the main proj, I finally started to get time to start working off-hours. But, I don't want to lose both the skills - My teammate(when we were still in office ;) ) once told me that they worked on a project that started with python code, and then later added features using Java. And I am unable to find any helpful google searches(mostly showing Spring vs Django).\nHow should I go about it? Is it too much to ask for? Is it worthwhile? Will I learn some new concepts of application architecture a noob like me would have missed. Please provide me with some insight.\nAre there resources(docs) I can go through?\nP.S. I'm not a diehard fan of either of the frameworks right now, just another coder testing waters.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":1059,"Q_Id":62921213,"Users Score":0,"Answer":"I would say go for 1 framework and stick with it. For example Django if you want to code in python, and spring if you want to code in java. Learning both frameworks however brings a lot of value, because you can compare their benefits (eg. spring forces you to write clean code, django has build-in and simpler database management)\nI like Django's build-in tooling a lot, you only need to know python for it to work. Spring requires a bit more knowledge of eg. hibernate for database management. However I predict Django will outgrow spring at some point, because of cloud valuing fast iteration over code and quick startup time (auto-scaling apps) over large overhead apps and long boot times. Hoever, if you like java, I can recommend JHipster for java\/spring webapp development to get up to speed very fast and learning the ways of REST CRUD api fast.\nTo combine 2 programs: write your main logic in one app, and write a small service in the second language, making sure its independent of the first app (no back and forth communication and complicated logic, but simple independent request\/response, as if the main app was never there). Add a REST api to the second app and use eg. http requests to communicate.\nWhat's possible in terms of combining languages:\n\nconnect different applications with each other: by letting them communicate through their APIs. For example a python api developed with flask or django can send requests to a java api developed with spring, as long as they have a way to communicate (eg over http, or via some queue like rabbitmq)\nconnect a webapp to 2 different backends: by using a shared authentication system: For example a keycloak authentication server to handle tokens, that your backend applications know about.\n\nWhat's not possible (and also not preferable):\n\ncombining java with python code in the same program: there are some hacky ways to get it to work, but its asking for trouble and not readable.","Q_Score":1,"Tags":"java,python,django,spring,backend","A_Id":65790969,"CreationDate":"2020-07-15T18:08:00.000","Title":"Is it possible to use more than one framework at the backend(Spring boot + Django)?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My Flask web application runs using nginx and gunicorn. I use supervisor to let my application run in the background. I always updated my files using Windows Power Shell and the command SCP. After i moved the new edited files, which are already existing on my Ubuntu server, to the server, i use the command sudo supervisorctl reload to restart the flask app to see the changes. But this time the flask app did not start and i only get 502 Bad Gateway. It does not matter how many times i reload the supervisor or restart nginx, i only get the error code 502.","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":464,"Q_Id":62942378,"Users Score":1,"Answer":"The issue was a not installed module and a typing error in a configuration file.","Q_Score":0,"Tags":"python,ubuntu,nginx,flask,supervisord","A_Id":62943749,"CreationDate":"2020-07-16T19:42:00.000","Title":"502 Bad Gateway after reloading supervisor","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I followed a Django tutorial and the tutor didn't talk about the need for a Virtual Env. He deployed via Digital Ocean.  I am trying to use Heroku but just found out that I ought to have activated a Virtual Env prior to the start of my Django project.\nDo I have to redo the  Django project  with a Vir Env or I can just go ahead to activate the Env and still deploy?","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":497,"Q_Id":62945004,"Users Score":0,"Answer":"Yes i think you can, but having a virtual environment is good practise. :) sorry if i wrong i'm new to all this.","Q_Score":0,"Tags":"python,django,heroku","A_Id":62945089,"CreationDate":"2020-07-16T23:34:00.000","Title":"Can I deploy to Heroku without a Virtual Environment?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"My API code is in python. It is hosted and works perfectly when called through postman. But when I try calling the same calls through my frontend react application, most of them respond 400 Bad request. Any idea as to why is this happening?\nMy application uses amazon cognito for authentication.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":162,"Q_Id":62950954,"Users Score":0,"Answer":"My GET requests were not working because I was sending content-type: \"application\/json\" in headers which was not required. Now its working fine.","Q_Score":1,"Tags":"python,reactjs,api,amazon-cognito,http-status-code-400","A_Id":63298179,"CreationDate":"2020-07-17T09:17:00.000","Title":"Most of my APIs are returning 400 bad request error while being called on frontend","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"About the data :\nwe have 2 video files which are same and audio of these files is also same but they differ in quality.\nthat is one is in 128kbps and 320kbps respectively.\nwe have used ffmpeg to extract the audio from video, and generated the hash values for both the audio file using the code : ffmpeg -loglevel error -i 320kbps.wav -map 0 -f hash -\nthe output was : SHA256=4c77a4a73f9fa99ee219f0019e99a367c4ab72242623f10d1dc35d12f3be726c\nsimilarly we did it for another audio file to which we have to compare ,\nC:\\FFMPEG>ffmpeg -loglevel error -i 128kbps.wav -map 0 -f hash -\nSHA256=f8ca7622da40473d375765e1d4337bdf035441bbd01187b69e4d059514b2d69a\nNow we know that these audio files and hash values are different but we want to know how much different\/similar they are actually , for eg: like some distance in  a-b is say 3\ncan someone help with this?","AnswerCount":2,"Available Count":1,"Score":0.0996679946,"is_accepted":false,"ViewCount":807,"Q_Id":62953484,"Users Score":1,"Answer":"You cannot use a SHA256 hash for this. This is intentional. It would weaken the security of the hash if you could. what you suggest is akin to differential cryptoanalysis. SHA256 is a modern cryptographic hash, and designed to be safe against such attacks.","Q_Score":3,"Tags":"python,audio,ffmpeg,computer-vision,similarity","A_Id":62953553,"CreationDate":"2020-07-17T11:57:00.000","Title":"how do we check similarity between hash values of two audio files in python?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I found that most modern browsers support HSTS and switch over to HTTPS if they find it in the HTTP\/HTTPS headers for the domain. Browsers would implemented appropriate response to teh HSTS header.\n\nWhat about client applications that are making http\/https calls to the web servers?\nDo standard http clients like apache commons library ot python requests already support that inherently? Or some flags have to bee set? How can that be done?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":180,"Q_Id":62955043,"Users Score":0,"Answer":"There's no way to answer for libraries \"like\" A or B. But typically libraries implement the protocol, but don't store any data by themselves (they have no way to persist stuff), so it'll be in the responsibility of the application using the library in question to store the HSTS information somewhere.\nUnless you're using a library that has this separate store. I'm not aware that any does (or doesn't), you'll have to check with the one that you intend to use. But my expectation is: You'll have to do it yourself.","Q_Score":0,"Tags":"python-requests,apache-commons-httpclient,hsts","A_Id":62956347,"CreationDate":"2020-07-17T13:30:00.000","Title":"Do applications have to explicitly implement action to HHTPS HSTS?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I created an app successfully from a Tutorial on Web2Py but when I uploaded the application to PythonAnywhere, I received this error:\nError ticket for \"pluralsight\"\nTicket ID\n75.159.30.26.2020-07-17.15-41-34.00821419-8e86-4d99-881d-c2cb400d0e22\n<type 'exceptions.ValueError'> unsupported pickle protocol: 3\nVersion\nweb2py\u2122     Version 2.18.5-stable+timestamp.2019.04.08.04.22.03\nPython  Python 2.7.12: \/usr\/local\/bin\/uwsgi (prefix: \/usr)","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":44,"Q_Id":62957442,"Users Score":1,"Answer":"It sounds like you're running web2py on Python 3 locally and with Python 2 on PythonAnywhere.  The best solution would be to upgrade it on PythonAnywhere:\n\nMake sure that you're using the most recent version of web2py itself by upgrading it from the main admin page inside your hosted web2py.\nOnce it's fully upgraded, go to the \"Web\" page inside PythonAnywhere and change the Python version to the version of Python 3 that matches the one that you're using locally (eg. 3.7 or 3.8)\nReload the site using the green button at the top of the \"Web\" page inside PythonAnywhere.\n\nThen you should be able to upload your app.","Q_Score":0,"Tags":"web2py,pythonanywhere","A_Id":62993464,"CreationDate":"2020-07-17T15:46:00.000","Title":"Why would a Web2Py website work locally but give me errors when I upload it to PythonAnywhere? How would I fix an error I don't get locally?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm typing django-admin.py startproject project in my vscode terminal on windows, but when I do it just flashes a screen then closes and the project isn't created. It asked me what to open with and I chose python, but the command doesn't do anything. I'm not getting errors either","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":133,"Q_Id":62958371,"Users Score":0,"Answer":"I was using django-admin.py instead of django-admin, problem is solved","Q_Score":1,"Tags":"python,django,visual-studio-code","A_Id":62958406,"CreationDate":"2020-07-17T16:45:00.000","Title":"django-admin.py does nothing when I execute it in visual studio","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am creating a like comment and reply feature using Flask. I have two options:\n\nif a user likes comment, variable will increase by 1, Code: like = like + 1, and it will be updated in the database. The total count will be retrieved by something like {{ like }} in jinja template\n\nor\n\nSaving yes for the comment id in the database, then use .count() to retrieve the total likes.\n\nWhich would you recommend and why, thank you!","AnswerCount":1,"Available Count":1,"Score":0.3799489623,"is_accepted":false,"ViewCount":81,"Q_Id":62962059,"Users Score":2,"Answer":"I'm not an expert but I think if you have the like and unlike button then you just do\nlike = like + 1 #in case of like \nlike = like - 1 #in case of unliking\nBecause the .count() function works in a Time complexity of O(length of yes's array) but if you always updated you can access the like count in O(1)","Q_Score":1,"Tags":"python,flask,jinja2","A_Id":62962156,"CreationDate":"2020-07-17T21:35:00.000","Title":"count() vs count = count + 1 in Flask","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"hello I noticed that some of the libraries I use are used for development but also for analysis and sometimes I have to use both is there a way to use a basic virtual environment as in the templates and can I use the two libraries a few times simultaneously","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":27,"Q_Id":62967434,"Users Score":0,"Answer":"Yes of course you can use multiple virtual environments. You need to create virtual envs. If you're already aware of anaconda env, you can create virtual envs with them else you can go in the normal way of creating venvs.\nAfter creating them, have 2 terminals each for each venv. Run your scripts.","Q_Score":0,"Tags":"python-3.x","A_Id":62968057,"CreationDate":"2020-07-18T10:26:00.000","Title":"possibility of using several virtual environments simultaneously","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"hello I noticed that some of the libraries I use are used for development but also for analysis and sometimes I have to use both is there a way to use a basic virtual environment as in the templates and can I use the two libraries a few times simultaneously","AnswerCount":2,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":27,"Q_Id":62967434,"Users Score":0,"Answer":"Yes.\n\nCreate two virtual environments.\n\nCall them v1 and v2\n\nOpen terminal x 2\n\nFirst terminal - activate v1 and install your library 1\n\nSecond terminal - activate v2 and install your library 1","Q_Score":0,"Tags":"python-3.x","A_Id":62967469,"CreationDate":"2020-07-18T10:26:00.000","Title":"possibility of using several virtual environments simultaneously","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"I've been reading about in-memory databases and how they use RAM instead of disk-storage.\nI'm trying to understand the pros and cons of building an in-memory database with different programming languages, particularly Java and Python. What would each implementation offer in terms of speed, efficiency, memory management and garbage collection?\nI think I could write a program in Python faster, but I'm not sure what additional benefits it would generate.\nI would imagine the language with a faster or more efficient memory management \/ garbage collection algorithm would be a better system to use because that would free up resources for my in-memory database. From my basic understanding I think Java's algorithm might be more efficient that Python's at freeing up memory. Would this be a correct assumption?\nCheers","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":136,"Q_Id":62979966,"Users Score":0,"Answer":"You choose an in-memory database for performance, right? An in-memory database written in C\/C++ and that provides an API for Java and\/or Python won't have GC issues. Many (most?) financial systems are sensitive to latency and 'jitter'. GC exacerbates jitter.","Q_Score":0,"Tags":"java,python,database,in-memory-database","A_Id":63001365,"CreationDate":"2020-07-19T11:57:00.000","Title":"In-memory database and programming language memory management \/ garbage collection","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am writing a rest api in flask to read data from some json files, turn them to pandas dataframes, read and\/or edit data from the data frames. When I turn the jsons into dataframes I want to make sure that any finite number of computers that access the api now has access to the same dataframes, and assuming computer A edits a data frame(maybe deletes a column called \"names\") , then when computers B-Z try to access the names column in tbe data frame it should also be gone for them. How do I achieve this in a flask emvironment. i already tried reading the files and declaring the dataframes at the start of the flask app but when i looked online for a bit i found that it's bad practice to  use global varibles in flask. All the help i found siggested using sessions, but that would mean the changes computer A makes to the dataframe, will be visible to only computer A unless it saves back to the json file and all other computer B-Z re-read from the Json. Thanks for your help.","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":54,"Q_Id":62980318,"Users Score":0,"Answer":"You should use a database to achieve that, if your project is not big, SQLite should be enough, and Flask-SQLAlchemy would be a good choice to make the persistent work easier.","Q_Score":0,"Tags":"python,session,flask","A_Id":62982003,"CreationDate":"2020-07-19T12:30:00.000","Title":"How to make a variable available accross all open flask sessions","Data Science and Machine Learning":1,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":1,"System Administration and DevOps":0,"Web Development":1},{"Question":"i would like to use nested variables inside my wtforms as:\n{{ render_field(form.date, size=32, class=\"form-control\", value=\"{{date}}\", disabled=true) }}\nOf course {{date}} will be seen as a string and just displayed. How can i pass a second variable inside a variable?\nNeed to pass the actual date inside the Input field as a value.\nThanks in advance!\nK3V1N","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":83,"Q_Id":62981453,"Users Score":0,"Answer":"You should write it just like this: ..., value = date, ..., you can put any varibles directly here as it's already in the {{ }} scope.","Q_Score":0,"Tags":"python,flask,wtforms","A_Id":62981751,"CreationDate":"2020-07-19T14:19:00.000","Title":"Flask wtforms nested variables","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In the main page of my website there is a long list, <ul>. Each list item represents a model object. Within the list there are the objects attributes, for example its name etc, and also buttons to change those attributes. The list is loaded from the sqlite database. The issue is since each button changes data in the database, to display the changed data, the view function reloads the page on each button click. That is fine, except the list is very long, and is necessary to scroll down, and on each button click, the page is reloaded therefore goes to the very top of the list. This makes the webpage almost unusable, or at least very annoying to use.\nCan someone recommend a workaround to this problem. Please let me know if my question is not clear","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":23,"Q_Id":62981982,"Users Score":1,"Answer":"It looks like what you want to achieve is something that should be done with Javascript. It will be the simplest way of doing it! For instance, you can call the corresponding API when the user clicks on one of the buttons, and if the API returns 'OK' then you can just update the item with the changes you made (because if the server returned yes, then you can assume that the local version of the data is the same than the one on the server)","Q_Score":0,"Tags":"python,django,django-models","A_Id":62982274,"CreationDate":"2020-07-19T15:05:00.000","Title":"Refreshing page on database modification","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have made a website using Django and hosted on Heroku. Everything was working fine until I try to alter my one of the column in the database. The thing is that I alter the column from max_length=1000 to max_length=60 but I forgot that I have entered value more than 60 so I got django.db.utils.DataError error that value is too long for 60.\nFor this problem solution, I refer one of the solutions available in StackOverflow to remove all the migrated file from its folder except init.py and then do fresh migration. So I tried that and I work with charm and I have changed the value so it could fit the max limit.\nBut now, when I try to create new column in database it says django.db.utils.ProgrammingError django.db.utils.ProgrammingError: column \"column_name\" of relation \"table\" does not exist\nActually, when I try to run my app on the local server it works fine and even it allows me to create a new column in my database but when I try to migrate it to Heroku database it shows django.db.utils.ProgrammingError","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":56,"Q_Id":62983436,"Users Score":0,"Answer":"make a backup from your server data. clean all the data on your database. delete all the migration.py files just as you read and then makemigrations and migrate again.","Q_Score":0,"Tags":"python,django,heroku","A_Id":62983485,"CreationDate":"2020-07-19T17:19:00.000","Title":"Heroku Datsbase Migration Error (django.db.utils.DataError)","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"In a project of mine I need to create an online encyclopedia. In order to do so, I need to create a page for each entry file, which are all written in Markdown, so I have to covert it to HTML before sending them to the website. I didn't want to use external libraries for this so I wrote my own python code that receives a Markdown file and returns a list with all the lines already formatted in HTML. The problem now is that I don't know how to inject this code to the template I have in Django, when I pass the list to it they are just printed like normal text. I know I could make my function write to an .html file but I don't think it's a great solution thinking about scalability.\nIs there a way to dynamically inject HTML in Django? Is there a \"better\" approach to my problem?","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":278,"Q_Id":63000895,"Users Score":2,"Answer":"You could use the safe filter in your template! So it would look like that.\nAssuming you have your html in a string variable called my_html then in your template just write\n{{ my_html | safe }}\nAnd don\u2019t forget to import it!","Q_Score":3,"Tags":"python,html,django","A_Id":63001041,"CreationDate":"2020-07-20T17:32:00.000","Title":"How to dinamically inject HTML code in Django","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"i just started working with python and with some scripts to automate some tasks. I manage to create a web scraper using selenium that notifies me daily with the latest news via a mail . Now the script works great if i run it manually , but my question is : How can i make the script to run automatically every day , and what option would you recomand . I know that you can use TaskScheduler and program it , but i was wondering if you know any options to run it directly in the cloud ? Also , i found some tutorials where they say to wrap all the code in an infinite loop and add a timer , and once you run the script it will stay active as a background process,\nI just started working with scripts and automation , so i would really like to know your opinion on the best way to run the script automatically . Thanks a lot","AnswerCount":3,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":663,"Q_Id":63005252,"Users Score":0,"Answer":"Im not sure if that is what you are looking for, but (if you are on windows) you could attach your program to your autostart.  Probably your Startup Folder: C:\\ProgramData\\Microsoft\\Windows\\Start Menu\\Programs\\Startup","Q_Score":1,"Tags":"python-3.x,selenium,web-scraping,automation,background","A_Id":63005523,"CreationDate":"2020-07-20T23:34:00.000","Title":"Python automation project to run in the background","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"How can i activate AWS APPFLOW flow by not using AWS Console but by using Rest API or Python or AWS CLI?\nI am not able to find any support from AWS Documentation or any blogs.","AnswerCount":3,"Available Count":1,"Score":0.0665680765,"is_accepted":false,"ViewCount":537,"Q_Id":63013662,"Users Score":1,"Answer":"If you use CloudFormation, you can create a Lambda-backed custom resource, which is going to be triggered during CloudFormation create\/update\/delete events. The Lambda function will be called with those events, and you can call AppFlow SDK to activate\/deactivate the flows.","Q_Score":1,"Tags":"python-3.x,amazon-web-services,aws-cli,saas","A_Id":69332449,"CreationDate":"2020-07-21T11:36:00.000","Title":"AWS APPFLOW | Trigger \/ Activate AWS Appflow flow from other than console","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I work in tech support and currently have to manually keep our manuals for products updated manually by periodically checking to see if it has an update and if it does replacing the current one saved on our network.\nI was wondering if it would be possible to build a small program to quickly download all files on a suppliers website and have them automatically download and be sorted into the given folders for those products, replacing the current PDF's in that file. I must also note that the website is password protected and is sorted into folders.\nIs this possible with Python? I figured a small program I could perhaps run once a week or something to automatically update our manuals would be super useful (and a learning experience).\nApologies if I haven't explained the requirement well, any questions let me know.","AnswerCount":2,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":77,"Q_Id":63022562,"Users Score":1,"Answer":"It's certainly possible. As the other answer suggests you will want to use libaries like Requests (Handle HTTP requests) or  Selenium (AUtomated browser activity) to navigate through the login.\nYou'll need to sort through the links on a given page, could be done with beautifulsoup ideally (An HTML parser) but could be done with selenium (Automated Browser activity).You'll need to check out libraries like requests (To handle HTTP requests) for downloading the pdf's, the OS module for sorting the folders out into specific folders and replacing files.\nI strongly urge you to think through the steps, But I hope that gives an idea about the libaries that you'll need to learn abit about. The most challenging thing to learn will be using selenium, so if you can use requests to do the login that is much better.\nIf you've got a basic grasp of python the requests, OS module and beautifulsoup libraries are not difficult things to pick up.","Q_Score":0,"Tags":"python,web-scraping,download","A_Id":63028786,"CreationDate":"2020-07-21T20:26:00.000","Title":"Scraping PDF's from a password protected website","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I want to implement sso for multiple providers in my app.\nCurrently I am using flask-oauthlib for the authentication. For google authentication sso login works like a charm. \nSince I will have multiple sso providers, I was wondering if I could simply have one text field on my landing page, and then redirect the user according to the email domain to the right sso provider while automatically initializing the handshake process. \nThe question is, to whether I can automatize the sso login, without having the user to select their account on Google's Choose an account page; thus saving an additional step?\nI hope this makes sense, thank you!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":318,"Q_Id":63037498,"Users Score":0,"Answer":"According to OAuth2.0 standards, at the time of authorizing this is not possible to tell SSO provider like Google in advance which user account is going to be used. But still needs to check particularly with OAuth2 implementation of Google. \nAccording to standards, user credentials like user name and password should only be challenged on SSO providers(IDP's) page.","Q_Score":0,"Tags":"python,flask,oauth,single-sign-on,flask-oauthlib","A_Id":63057267,"CreationDate":"2020-07-22T15:10:00.000","Title":"Automatic sso login","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a basic Flask app running, with the code in main.py hosting the flask app. I also have an index.html file that will get text input from the user. I can use request.form to access the input, and I can work with it successfully. However, I encountered a problem.\nI need to call a JavaScript function that opens a new tab with a certain website. For example, if the user types in Wikipedia, I need to tell JavaScript to window.open(\"https:\/\/www.wikipedia.org\"). The problem is, I can't find any working way to call a JavaScript function from a Flask application.\nAnd before you mark this question as duplicate, the answer to the one Stack Overflow question on this I found did not even involve flask, and the other answer (using webbrowser.open_new_tab) opened the new tab on the server machine, not on the client machine (the one where the website is actually being accessed).\nI know you can call a Python function from JavaScript, but is it possible to do it the other way?\nThank You in advance.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":170,"Q_Id":63039584,"Users Score":1,"Answer":"One way to do this is by passing the url as a query string to the url containing the javascript. You can acces the query string in javascript and use it in the function that opens the window.","Q_Score":0,"Tags":"javascript,python,flask","A_Id":63041041,"CreationDate":"2020-07-22T17:06:00.000","Title":"Call a JavaScript Function from Flask","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have a react \/ django app. The django side hosts a sqlite database, and react displays its content as the front end. When I run the command python manage.py runserver it is hosted locally on port 8000. My specific problem is manifest when I make edits to my React code. Even after refreshing the page and restarting the server, my front-end still remains as it was before I had edited the code and saved. I have no errors, or warnings.\nThe only way I seem to be able to make it work is by pushing to GitHub and then cloning the repository on my system again. Would anyone be able to help me understand my dilemma? (Please let me know if my question is not to par with the guidelines of Stack Overflow, this is my first time)","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":61,"Q_Id":63046721,"Users Score":0,"Answer":"Apparently I was supposed to be running npm run dev. Started working after that.","Q_Score":0,"Tags":"python,django,reactjs,localhost","A_Id":63417784,"CreationDate":"2020-07-23T04:03:00.000","Title":"Why is my project no longer updating when I write new code?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I got stuck in one Place. I have a Tkinter Application and Web Application on Django. I have a login system in both Application. Rather making two distinct User Model, I want to linked My Tkinter Desktop Application with Django user Model so that I can synchronized the User data in both Application but the problem is when I am checking the password in my tkinter Application it is checking it as a plain text but the password in django User Model cannot be decrypt. So, Is there any way that I can synchronized my Desktop Application (Tkinter) and Web Application (Django) with one User Model (Django)?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":578,"Q_Id":63048797,"Users Score":0,"Answer":"How to Connect Tkinter Application with Django User Model?-\nStep number0: Put in same directory as django application\nStep number1: Create a basic tkinter app\nStep number2: import the user models","Q_Score":0,"Tags":"python,django,tkinter","A_Id":68990480,"CreationDate":"2020-07-23T07:13:00.000","Title":"How to Connect Tkinter Application with Django User Model?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":1,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I am building a web application with Django and I show the graphs in the website. The graphs are obtained from real time websites and is updated daily. I want to know how can I send graphs using matplotlib to template and add refresh option with javascript which will perform the web scraping script which I have written. The main question is which framework should I use? AJAX, Django REST, or what?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":85,"Q_Id":63053644,"Users Score":1,"Answer":"You're better off using a frontend framework and calling the backend for the data via JS. separating the front and backend is a more contemporary approach and has some advantages over doing it all in the backend.\nFrom personal experience, it gets really messy mixing Python and JS in the same system.\nUse Django as a Rest-ful backend, and try not to use AJAX in the frontend, then pick a frontend of your choice to deliver the web app.","Q_Score":1,"Tags":"javascript,python,django,ajax","A_Id":63054092,"CreationDate":"2020-07-23T11:53:00.000","Title":"How to control Django with Javascript?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I'm pretty new to python and scrapy. Right now I'm using a spider that is utilizing selenium to load JS pages. I'm running a windows computer through Bootcamp and I have about 10GB of storage left, however, when I run my scrapy spider, within 30 minutes of running it takes up almost half of that storage and I'm not sure why. I turned HTTP Cache off in settings.py but it still is eating up several GBs of storage.\nI'm using the -o command in my cmd to save the output to a csv, but that's the only thing I can think of that would take up storage. Any advice would be greatly appreciated!","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":39,"Q_Id":63083380,"Users Score":0,"Answer":"You have a couple of options with your information given. Most notably, run the python script on your mac instead of the Bootcamp windows. If your storage is being eaten up, you can try writing to a .txt instead of .csv. Maybe try giving an example of what you are loading up \/ trying to do so I could replicate","Q_Score":0,"Tags":"python,selenium,web-scraping,scrapy","A_Id":63083404,"CreationDate":"2020-07-25T01:30:00.000","Title":"Scrapy using significant computer storage","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"i have some data in Django database and i want to select them and copy them to an other external database in use  the structure of tables in Django database and in external database is same\ni hope find any help please for make this logic ,thank you","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":202,"Q_Id":63086763,"Users Score":0,"Answer":"If you want to start the process via a button, I would recommend that you use Aayush's code within a django view that is called by your button. If the transfer takes too much time to wait for the site to refresh afterwarda, you can call the view via ajax or you can call the script as a parallel process via the view.","Q_Score":0,"Tags":"python,django,database","A_Id":63091540,"CreationDate":"2020-07-25T09:38:00.000","Title":"how to Select data from django tables and insert them to an another external database in use?","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I\u2019m using the GoogleCloudStorageToBigQueryOperator to create a small table in BigQuery using a csv file in GCS. I have the airflow in a VirtualBox on my local machine. Every time, this simple operation takes 15 minutes exactly to complete. I\u2019ve tried changing from Local to Celery Executor but it still takes 15 minutes. Any suggestions please to improve the performance?\nThanks a lot,\nSri.","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":61,"Q_Id":63088405,"Users Score":0,"Answer":"I've created a VM on the GCP and installed airflow on it. Moved the DAG on to it and the data got loaded within seconds.","Q_Score":0,"Tags":"python,google-cloud-platform,celery,airflow","A_Id":63123131,"CreationDate":"2020-07-25T12:38:00.000","Title":"Airflow - GCP Operator: GoogleCloudStorageToBigQueryOperator - Takes 15 minutes to complete","Data Science and Machine Learning":0,"Database and SQL":1,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"I'm writing a desktop and web app, Just need to know how can i authorize this desktop application with same open web app browser after installed?","AnswerCount":1,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":272,"Q_Id":63097491,"Users Score":0,"Answer":"if you mean to authorize your desktop app via the login of user from any web browser, you can use TCP\/UDP socket or also for example , call an api every 2 seconds to check is user is loged in or not. in web browser , if user had be loged in , you can set login state with its ip or other data in database to authorize the user from desktop app.","Q_Score":0,"Tags":"python,c#,node.js,angular,desktop-application","A_Id":63097587,"CreationDate":"2020-07-26T07:50:00.000","Title":"Windows desktop application read session data from browser","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I haven't set up my spider as a Scrapy project, so don't have the settings.py file for settings. But I still want to implement as many methods as I can to avoid being blocked\/blacklisted. Is there any way to add these rotations and settings outside of a Scrapy project and only within the CrawlerRunner function???\nThanks!","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":53,"Q_Id":63102923,"Users Score":0,"Answer":"If anyone else is wondering, there isn't a way to do this when using the CrawlerRunner function. I just had to set up a Scrapy project which didn't end up being as hard as I thought it would be. Theres plenty of info and \"hello world\" tutorials to follow online.\nGood luck!","Q_Score":1,"Tags":"scrapy,python-requests,web-crawler","A_Id":63417083,"CreationDate":"2020-07-26T16:38:00.000","Title":"Rotating IPs and user agents using Scrapy CrawlerRunner","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created an API using AWS Lambda function (using Python). Now my react js code hits this API whenever an event fire. So user can request API as many times the events are fired. Now the problem is we are not getting the response from lambda API sequentially. Sometime we are getting the response of our last request faster than the previous response of previous request.\nSo we need to handle our response in Lambda function sequentially, may be adding some delay between 2 request or may be implementing throttling. So how can I do that.","AnswerCount":3,"Available Count":2,"Score":1.2,"is_accepted":true,"ViewCount":363,"Q_Id":63149889,"Users Score":0,"Answer":"You can use SQS FIFO Queue as a trigger on the Lambda function, set Batch size to 1, and the Reserved Concurrency on the Function to 1. The messages will always be processed in order and will not concurrently poll the next message until the previous one is complete.\nSQS triggers do not support Batch Window - which will 'wait' until polling the next message. This is a feature for Stream based Lambda triggers (Kinesis and DynamoDB Streams)\nIf you want to streamlined process, Step Function will let you manage states using state machines and supports automatic retry based off the outputs of individual states.","Q_Score":0,"Tags":"python-3.x,reactjs,amazon-web-services,api,aws-lambda","A_Id":63158828,"CreationDate":"2020-07-29T08:54:00.000","Title":"How to set intervals between multiple requests AWS Lambda API","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have created an API using AWS Lambda function (using Python). Now my react js code hits this API whenever an event fire. So user can request API as many times the events are fired. Now the problem is we are not getting the response from lambda API sequentially. Sometime we are getting the response of our last request faster than the previous response of previous request.\nSo we need to handle our response in Lambda function sequentially, may be adding some delay between 2 request or may be implementing throttling. So how can I do that.","AnswerCount":3,"Available Count":2,"Score":0.0665680765,"is_accepted":false,"ViewCount":363,"Q_Id":63149889,"Users Score":1,"Answer":"Did you check the concurrency setting on Lambda? You can throttle the lambda there.\nBut if you throttle the lambda and the requests being sent are not being received, the application sending the requests might be receiving an error unless you are storing the requests somewhere on AWS for being processed later.\nI think putting an SQS in front of lambda might help. You will be hitting API gateway, the requests get sent to SQS, lambda polls requests concurrently (you can control the concurrency) and then send the response back.","Q_Score":0,"Tags":"python-3.x,reactjs,amazon-web-services,api,aws-lambda","A_Id":63150857,"CreationDate":"2020-07-29T08:54:00.000","Title":"How to set intervals between multiple requests AWS Lambda API","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Would it be possible to store an image and a value together in a database? Like in a array?\nSo it would be like [image, value]. I\u2019m just trying to be able to access the image to print that and then access the value later (for example a image if a multi-choice question and its answer is the value).\nAlso how would I implement and access this? I\u2019m using Firebase with the pyrebase wrapper for python but if another database is more suitable I\u2019m open to suggestions.","AnswerCount":2,"Available Count":1,"Score":0.0,"is_accepted":false,"ViewCount":31,"Q_Id":63152159,"Users Score":0,"Answer":"you can set your computer as a server and in database you can store like [image_path, value].","Q_Score":0,"Tags":"python,database,firebase,pyrebase","A_Id":63152348,"CreationDate":"2020-07-29T11:03:00.000","Title":"Is it possible to store an image with a value in a way similar to an array, in a database (Firebase or any other)?","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"I have written a spider in scrapy. Everytime i try to scrape a specific website, the spider is running quite well at the start. but when i goes down to like 500-600 request, the spider start to crawl very slowly.\nI have checked memory and cpu settings but that is not the problem. Im quite sure that the website is slowing down my requests.\nHow do i adjust scrapy to scrape fast and consistently?","AnswerCount":1,"Available Count":1,"Score":0.1973753202,"is_accepted":false,"ViewCount":77,"Q_Id":63161677,"Users Score":1,"Answer":"If the website is slowing down your requests, it's probably best to be more careful with the requests you're sending.\nA couple of things you can try:\n\nSet 'AUTOTHROTTLE_ENABLED' to True: when scrapy sees the server is responding slowly, it will adjust the crawling speed\nLimit the number of concurrent requests yourself (by setting CONCURRENT_REQUESTS_PER_DOMAIN), and change the DOWNLOAD_DELAY to wait a bit between requests\nUse proxies: most likely the target website is limiting you based on the IP. Using proxies will overcome this, but this will not help in case the target server is overloaded by your requests","Q_Score":0,"Tags":"python,scrapy","A_Id":63167234,"CreationDate":"2020-07-29T20:08:00.000","Title":"Scrapy: website is slowing down my requests","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":1,"Other":0,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1},{"Question":"Background :\nIn our project we are doing bulk deployment in that we are having around 10 AWS Lambda functions, Few Scala applications and few configuration files. Currently we are deploying 10 lambdas if there is no change as well.\nProblem :\nLets say we have changed code in Scala class, committed to GIT and from there using Jenkins we are deploying the changes. As we have no differentiation between Lambda and Scala changes we are deploying all the Lambdas, Scala classes and Configuration files as well.\nQuestion :\nMy question here is if we implement SAM on top of our Lambdas and then will separate it out deploying all the lambdas at a time as a separate Jenkins pipeline. If there is a change for 1 Python code in Lambda functions will it allow to deploy only delta Lambdas.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":212,"Q_Id":63173449,"Users Score":0,"Answer":"sam deploy will only deploy resources if they have changed.  Otherwise it noops (no operation).","Q_Score":0,"Tags":"python,scala,amazon-web-services,jenkins,aws-sam","A_Id":63185227,"CreationDate":"2020-07-30T12:44:00.000","Title":"Deploying AWS Lambda using AWS SAM in Jenkins","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"Background :\nIn our project we are doing bulk deployment in that we are having around 10 AWS Lambda functions, Few Scala applications and few configuration files. Currently we are deploying 10 lambdas if there is no change as well.\nProblem :\nLets say we have changed code in Scala class, committed to GIT and from there using Jenkins we are deploying the changes. As we have no differentiation between Lambda and Scala changes we are deploying all the Lambdas, Scala classes and Configuration files as well.\nQuestion :\nMy question here is if we implement SAM on top of our Lambdas and then will separate it out deploying all the lambdas at a time as a separate Jenkins pipeline. If there is a change for 1 Python code in Lambda functions will it allow to deploy only delta Lambdas.","AnswerCount":2,"Available Count":2,"Score":0.0,"is_accepted":false,"ViewCount":212,"Q_Id":63173449,"Users Score":0,"Answer":"You always have to deploy the entire stack using sam deploy. If some of your lambdas don't have changes, then --no-fail-on-empty-changeset will be your new friend.","Q_Score":0,"Tags":"python,scala,amazon-web-services,jenkins,aws-sam","A_Id":65644545,"CreationDate":"2020-07-30T12:44:00.000","Title":"Deploying AWS Lambda using AWS SAM in Jenkins","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":1,"Web Development":1},{"Question":"In python I can get test coverage by coverage run -m unittest and the do coverage report -m \/ coverage html to get html report.\nHowever, it does not show the actual unit test report. The unit test result is in the logs, but I would like to capture it in a xml or html, so I can integrate it with Jenkins and publish on each build. This way user does not have to dig into logs.\nI tried to find solution to this but could not find any, please let me know, how we can get this using coverage tool.\nI can get this using nose2 - nose2 --html-report --with-coverage --coverage-report html - this will generate two html report - one for unit test and other for coverage. But for some reason this fails when I run with actual project (no coverage data collected \/ reported)","AnswerCount":1,"Available Count":1,"Score":1.2,"is_accepted":true,"ViewCount":1862,"Q_Id":63195130,"Users Score":0,"Answer":"Ok for those who end up here , I solved it with -\nnose2 --html-report --with-coverage --coverage-report html --coverage .\/ \nThe issue I was having earlier with 'no coverage data' was fixed by specifying the the directory where the coverage should be reported, in the command above its with --coverage .\/","Q_Score":1,"Tags":"python,unit-testing,code-coverage","A_Id":63252613,"CreationDate":"2020-07-31T15:51:00.000","Title":"Python Coverage how to generate Unittest report","Data Science and Machine Learning":0,"Database and SQL":0,"GUI and Desktop Applications":0,"Networking and APIs":0,"Other":1,"Python Basics and Environment":0,"System Administration and DevOps":0,"Web Development":1}]