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subprocess run command 'start command -flags arguments' through the shell

Python, running command line tools in parallel

subprocess.call('start command -flags arguments', shell=True)

run command 'command -flags arguments &' on command line tools as separate processes

Python, running command line tools in parallel

subprocess.call('command -flags arguments &', shell=True)

replace percent-encoded code in request `f` to their single-character equivalent

Passing the '+' character in a POST request in Python

f = urllib.request.urlopen(url, urllib.parse.unquote(urllib.parse.urlencode(params)))

remove white spaces from the end of string " xyz "

How do I remove whitespace from the end of a string in Python?

""" xyz """.rstrip()

Replace special characters in utf-8 encoded string `s` using the %xx escape

URL encoding in python

urllib.parse.quote(s.encode('utf-8'))

URL encoding in python

urllib.parse.quote_plus('a b')

Create an array containing the conversion of string '100110' into separate elements

Convert string to numpy array

np.array(map(int, '100110'))

convert a string 'mystr' to numpy array of integer values

Convert string to numpy array

print(np.array(list(mystr), dtype=int))

convert an rgb image 'messi5.jpg' into grayscale `img`

How can I convert an RGB image into grayscale in Python?

img = cv2.imread('messi5.jpg', 0)

sort list `lst` in descending order based on the second item of each tuple in it

sorting a graph by its edge weight. python

lst.sort(key=lambda x: x[2], reverse=True)

How to find all occurrences of an element in a list?

indices = [i for i, x in enumerate(my_list) if x == 'whatever']

execute shell command 'grep -r PASSED *.log | sort -u | wc -l' with a | pipe in it

How can I execute shell command with a | pipe in it

subprocess.call('grep -r PASSED *.log | sort -u | wc -l', shell=True)

count the number of trailing question marks in string `my_text`

How to count the number of a specific character at the end of a string ignoring duplicates?

len(my_text) - len(my_text.rstrip('?'))

remove dollar sign '$' from second to last column data in dataframe 'df' and convert the data into floats

converting currency with $ to numbers in Python pandas

df[df.columns[1:]].replace('[\\$,]', '', regex=True).astype(float)

Merge column 'word' in dataframe `df2` with column 'word' on dataframe `df1`

Conditionally fill a column of a pandas df with values of a different df

df1.merge(df2, how='left', on='word')

switch positions of each two adjacent characters in string `a`

Switch every pair of characters in a string

print(''.join(''.join(i) for i in zip(a2, a1)) + a[-1] if len(a) % 2 else '')

make a window `root` jump to the front

How to make a window jump to the front?

root.attributes('-topmost', True)

make a window `root` jump to the front

How to make a window jump to the front?

root.lift()

Convert list of booleans `walls` into a hex string

Elegant way to convert list to hex string

hex(int(''.join([str(int(b)) for b in walls]), 2))

convert the sum of list `walls` into a hex presentation

Elegant way to convert list to hex string

hex(sum(b << i for i, b in enumerate(reversed(walls))))

print the string `Total score for`, the value of the variable `name`, the string `is` and the value of the variable `score` in one print call.

Print multiple arguments in python

print(('Total score for', name, 'is', score))

print multiple arguments 'name' and 'score'.

Print multiple arguments in python

print('Total score for {} is {}'.format(name, score))

print a string using multiple strings `name` and `score`

Print multiple arguments in python

print('Total score for %s is %s ' % (name, score))

print string including multiple variables `name` and `score`

Print multiple arguments in python

print(('Total score for', name, 'is', score))

serve a static html page 'your_template.html' at the root of a django project

Is it possible to serve a static html page at the root of a django project?

url('^$', TemplateView.as_view(template_name='your_template.html'))

use a list of values `[3,6]` to select rows from a pandas dataframe `df`'s column 'A'

use a list of values to select rows from a pandas dataframe

df[df['A'].isin([3, 6])]

How to get the concrete class name as a string?

instance.__class__.__name__

execute python code `myscript.py` in a virtualenv `/path/to/my/venv` from matlab

How can I execute Python code in a virtualenv from Matlab

system('/path/to/my/venv/bin/python myscript.py')

django return a QuerySet list containing the values of field 'eng_name' in model `Employees`

django models selecting single field

Employees.objects.values_list('eng_name', flat=True)

find all digits in string '6,7)' and put them to a list

Python regex findall alternation behavior

re.findall('\\d|\\d,\\d\\)', '6,7)')

prompt string 'Press Enter to continue...' to the console

How do I make python to wait for a pressed key

input('Press Enter to continue...')

print string "ABC" as hex literal

Print string as hex literal python

"""
ABC""".encode('hex')

insert a new field 'geolocCountry' on an existing document 'b' using pymongo

python + pymongo: how to insert a new field on an existing document in mongo from a for loop

db.Doc.update({'_id': b['_id']}, {'$set': {'geolocCountry': myGeolocCountry}})

Write a regex statement to match 'lol' to 'lolllll'.

Regex to match 'lol' to 'lolllll' and 'omg' to 'omggg', etc

re.sub('l+', 'l', 'lollll')

BeautifulSoup find all 'tr' elements in HTML string `soup` at the five stride starting from the fourth element

Getting the nth element using BeautifulSoup

rows = soup.findAll('tr')[4::5]

reverse all x-axis points in pyplot

Reverse Y-Axis in PyPlot

plt.gca().invert_xaxis()

reverse y-axis in pyplot

Reverse Y-Axis in PyPlot

plt.gca().invert_yaxis()

stack two dataframes next to each other in pandas

How do I stack two DataFrames next to each other in Pandas?

pd.concat([GOOG, AAPL], keys=['GOOG', 'AAPL'], axis=1)

create a json response `response_data`

Creating a JSON response using Django and Python

return HttpResponse(json.dumps(response_data), content_type='application/json')

decode escape sequences in string `myString`

Process escape sequences in a string

myString.decode('string_escape')

calculate the md5 checksum of a file named 'filename.exe'

How do I calculate the md5 checksum of a file in Python?

hashlib.md5(open('filename.exe', 'rb').read()).hexdigest()

Find all keys from a dictionary `d` whose values are `desired_value`

Finding key from value in Python dictionary:

[k for k, v in d.items() if v == desired_value]

create a set containing all keys' names from dictionary `LoD`

Extract all keys from a list of dictionaries

{k for d in LoD for k in list(d.keys())}

create a set containing all keys names from list of dictionaries `LoD`

Extract all keys from a list of dictionaries

set([i for s in [list(d.keys()) for d in LoD] for i in s])

extract all keys from a list of dictionaries `LoD`

Extract all keys from a list of dictionaries

[i for s in [list(d.keys()) for d in LoD] for i in s]

unpack keys and values of a dictionary `d` into two lists

Is there a more elegant way for unpacking keys and values of a dictionary into two lists, without losing consistence?

keys, values = zip(*list(d.items()))

convert a string `s` containing a decimal to an integer

Convert a string to integer with decimal in Python

int(Decimal(s))

Convert a string to integer with decimal in Python

int(s.split('.')[0])

check if array `b` contains all elements of array `a`

Numpy: How to check if array contains certain numbers?

numpy.in1d(b, a).all()

numpy: check if array 'a' contains all the numbers in array 'b'.

Numpy: How to check if array contains certain numbers?

numpy.array([(x in a) for x in b])

Draw node labels `labels` on networkx graph `G ` at position `pos`

Node labels using networkx

networkx.draw_networkx_labels(G, pos, labels)

make a row-by-row copy `y` of array `x`

How to make a copy of a 2D array in Python?

y = [row[:] for row in x]

Create 2D numpy array from the data provided in 'somefile.csv' with each row in the file having same number of values

Pythonic way to populate numpy array

X = numpy.loadtxt('somefile.csv', delimiter=',')

get a list of items from the list `some_list` that contain string 'abc'

Check if a Python list item contains a string inside another string

matching = [s for s in some_list if 'abc' in s]

export a pandas data frame `df` to a file `mydf.tsv` and retain the indices

How to write/read a Pandas DataFrame with MultiIndex from/to an ASCII file?

df.to_csv('mydf.tsv', sep='\t')

How do I create a LIST of unique random numbers?

random.sample(list(range(100)), 10)

split a string `s` on last delimiter

Splitting on last delimiter in Python string?

s.rsplit(',', 1)

Check if all elements in list `lst` are tupples of long and int

Python check if all elements of a list are the same type

all(isinstance(x, int) for x in lst)

check if all elements in a list 'lst' are the same type 'int'

Python check if all elements of a list are the same type

all(isinstance(x, int) for x in lst)

strip a string `line` of all carriage returns and newlines

Python . How to get rid of '\r' in string?

line.strip()

scroll to the bottom of a web page using selenium webdriver

How can I scroll a web page using selenium webdriver in python?

driver.execute_script('window.scrollTo(0, Y)')

scroll a to the bottom of a web page using selenium webdriver

How can I scroll a web page using selenium webdriver in python?

driver.execute_script('window.scrollTo(0, document.body.scrollHeight);')

convert Date object `dateobject` into a DateTime object

How do I convert a datetime.date object into datetime.datetime in python?

datetime.datetime.combine(dateobject, datetime.time())

check if any item from list `b` is in list `a`

How to check if one of the following items is in a list?

print(any(x in a for x in b))

save a numpy array `image_array` as an image 'outfile.jpg'

Saving a Numpy array as an image

scipy.misc.imsave('outfile.jpg', image_array)

Remove anything in parenthesis from string `item` with a regex

Regex for removing data in parenthesis

item = re.sub(' ?\\([^)]+\\)', '', item)

Remove word characters in parenthesis from string `item` with a regex

Regex for removing data in parenthesis

item = re.sub(' ?\\(\\w+\\)', '', item)

Remove all data inside parenthesis in string `item`

Regex for removing data in parenthesis

item = re.sub(' \\(\\w+\\)', '', item)

check if any elements in one list `list1` are in another list `list2`

Checking if any elements in one list are in another

len(set(list1).intersection(list2)) > 0

convert hex string `s` to decimal

convert hex to decimal

i = int(s, 16)

convert hex string "0xff" to decimal

convert hex to decimal

int('0xff', 16)

convert hex string "FFFF" to decimal

convert hex to decimal

int('FFFF', 16)

convert hex string '0xdeadbeef' to decimal

convert hex to decimal

ast.literal_eval('0xdeadbeef')

convert hex string 'deadbeef' to decimal

convert hex to decimal

int('deadbeef', 16)

take screenshot 'screen.png' on mac os x

Take screenshot in Python on Mac OS X

os.system('screencapture screen.png')

Set a window size to `1400, 1000` using selenium webdriver

How to set window size using phantomjs and selenium webdriver in python

driver.set_window_size(1400, 1000)

replace non-ascii chars from a unicode string u'm\xfasica'

Replace non-ascii chars from a unicode string in Python

unicodedata.normalize('NFKD', 'm\xfasica').encode('ascii', 'ignore')

concatenate dataframe `df1` with `df2` whilst removing duplicates

Pandas/Python: How to concatenate two dataframes without duplicates?

pandas.concat([df1, df2]).drop_duplicates().reset_index(drop=True)

Construct an array with data type float32 `a` from data in binary file 'filename'

numpy: efficiently reading a large array

a = numpy.fromfile('filename', dtype=numpy.float32)

execute a mv command `mv /home/somedir/subdir/* somedir/` in subprocess

How to use the mv command in Python with subprocess

subprocess.call('mv /home/somedir/subdir/* somedir/', shell=True)

How to use the mv command in Python with subprocess

subprocess.call('mv /home/somedir/subdir/* somedir/', shell=True)

print a character that has unicode value `\u25b2`

How to use Unicode characters in a python string

print('\u25b2'.encode('utf-8'))

compare contents at filehandles `file1` and `file2` using difflib

Comparing two .txt files using difflib in Python

difflib.SequenceMatcher(None, file1.read(), file2.read())

Create a dictionary from string `e` separated by `-` and `,`

Creating a dictionary from a string

dict((k, int(v)) for k, v in (e.split(' - ') for e in s.split(',')))

check if all elements in a tuple `(1, 6)` are in another `(1, 2, 3, 4, 5)`

How to check if all elements in a tuple or list are in another?

all(i in (1, 2, 3, 4, 5) for i in (1, 6))

extract unique dates from time series 'Date' in dataframe `df`

python pandas extract unique dates from time series

df['Date'].map(lambda t: t.date()).unique()

right align string `mystring` with a width of 7

Formatting text to be justified in Python 3.3 with .format() method

"""{:>7s}""".format(mystring)

read an excel file 'ComponentReport-DJI.xls'

How do I read an Excel file into Python using xlrd? Can it read newer Office formats?

open('ComponentReport-DJI.xls', 'rb').read(200)

sort dataframe `df` based on column 'b' in ascending and column 'c' in descending

How to sort a dataFrame in python pandas by two or more columns?

df.sort_values(['b', 'c'], ascending=[True, False], inplace=True)

sort dataframe `df` based on column 'a' in ascending and column 'b' in descending

How to sort a dataFrame in python pandas by two or more columns?

df.sort_values(['a', 'b'], ascending=[True, False])

sort a pandas data frame with column `a` in ascending and `b` in descending order

How to sort a dataFrame in python pandas by two or more columns?

df1.sort(['a', 'b'], ascending=[True, False], inplace=True)

sort a pandas data frame by column `a` in ascending, and by column `b` in descending order

How to sort a dataFrame in python pandas by two or more columns?

df.sort(['a', 'b'], ascending=[True, False])

django redirect to view 'Home.views.index'

Django redirect to root from a view

redirect('Home.views.index')

remove all values within one list `[2, 3, 7]` from another list `a`

Remove all values within one list from another list in python

[x for x in a if x not in [2, 3, 7]]

remove the punctuation '!', '.', ':' from a string `asking`

How to remove all the punctuation in a string? (Python)

out = ''.join(c for c in asking if c not in ('!', '.', ':'))

BeautifulSoup get value associated with attribute 'content' where attribute 'name' is equal to 'City' in tag 'meta' in HTML parsed string `soup`

Python: BeautifulSoup - get an attribute value based on the name attribute

soup.find('meta', {'name': 'City'})['content']

unquote a urlencoded unicode string '%0a'

How to unquote a urlencoded unicode string in python?

urllib.parse.unquote('%0a')

decode url `url` from UTF-16 code to UTF-8 code

How to unquote a urlencoded unicode string in python?

urllib.parse.unquote(url).decode('utf8')

empty a list `lst`

empty a list

del lst[:]

empty a list `lst`

empty a list

del lst1[:]