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AhmedSSoliman

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convert a list to a dictionary in python

b = dict(zip(a[0::2], a[1::2]))

python - sort a list of nested lists

l.sort(key=sum_nested)

how to get the size of a string in python?

print(len('\xd0\xb9\xd1\x86\xd1\x8b'))

how to get the fft of a numpy array to work?

np.fft.fft(xfiltered)

calculating difference between two rows in python / pandas

data.set_index('Date').diff()

efficient computation of the least-squares algorithm in numpy

np.linalg.solve(np.dot(a.T, a), np.dot(a.T, b))

how to add an image in tkinter (python 2.7)

root.mainloop()

matrix mirroring in python

np.concatenate((A[::-1, :], A[1:, :]), axis=0)

truth value of numpy array with one falsey element seems to depend on dtype

np.array(['a', 'b']) != 0

add column sum as new column in pyspark dataframe

newdf = df.withColumn('total', sum(df[col] for col in df.columns))

how to find elements by class

soup.find_all('div', class_='stylelistrowone stylelistrowtwo')

how to pad all the numbers in a string

re.sub('\\d+', lambda x: x.group().zfill(padding), s)

removing elements from an array that are in another array

[[1, 1, 2], [1, 1, 3]]

autofmt_xdate deletes x-axis labels of all subplots

plt.setp(plt.xticks()[1], rotation=30, ha='right')

looking for a simple opengl (3.2+) python example that uses glfw

glfw.Terminate()

reorder indexed rows `['z', 'c', 'a']` based on a list in pandas data frame `df`

df.reindex(['Z', 'C', 'A'])

issue sending email with python?

server = smtplib.SMTP('smtp.gmail.com', 587)

return rows of data associated with the maximum value of column 'value' in dataframe `df`

df.loc[df['Value'].idxmax()]

how to invoke a specific python version within a script.py -- windows

print('World')

set index equal to field 'trx_date' in dataframe `df`

df = df.set_index(['TRX_DATE'])

reference to an element in a list

c[:] = b

how to merge two columns together in pandas

pd.melt(df, id_vars='Date')[['Date', 'value']]

create svg / xml document without ns0 namespace using python elementtree

etree.register_namespace('', 'http://www.w3.org/2000/svg')

python - flatten a dict of lists into unique values?

sorted({x for v in content.values() for x in v})

argparse module how to add option without any argument?

parser.add_argument('-s', '--simulate', action='store_true')

un-escaping characters in a string with python

"""\\u003Cp\\u003E""".decode('unicode-escape')

cookies with urllib2 and pywebkitgtk

opener = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(cj))

how to unquote a urlencoded unicode string in python?

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

tensorflow: how to get a tensor by name?

sess.run('add:0')

how to extract links from a webpage using lxml, xpath and python?

['http://stackoverflow.com/foobar', 'http://stackoverflow.com/baz']

encode value of key `city` in dictionary `data` as `ascii`, ignoring non-ascii characters

data['City'].encode('ascii', 'ignore')

append 2 dimensional arrays to one single array

array([[[1, 5], [2, 6]], [[3, 7], [4, 8]]])

convert list of lists to delimited string

result = '\n'.join('\t'.join(map(str, l)) for l in lists)

pandas: how to run a pivot with a multi-index?

df.groupby(['year', 'month', 'item'])['value'].sum().unstack('item')

python: sort a list of lists by an item in the sublist

sorted(li, key=operator.itemgetter(1), reverse=True)

get key by value in dictionary with same value in python?

print([key for key, value in list(d.items()) if value == 1])

how do you create nested dict in python?

dict(d)

how to replace unicode characters in string with something else python?

str.decode('utf-8')

get count of values associated with key in dict python

sum(1 if d['success'] else 0 for d in s)

access item in a list of lists

50 - list1[0][0] + list1[0][1] - list1[0][2]

python how to get every first element in 2 dimensional list `a`

[i[0] for i in a]

find the element that holds string 'text a' in file `root`

e = root.xpath('.//a[text()="TEXT A"]')

how to get the content of a html page in python

"""""".join(soup.findAll(text=True))

joining two numpy matrices

np.hstack([X, Y])

how to center labels in histogram plot

ax.set_xticklabels(('1', '2', '3', '4'))

interprocess communication in python

socket.send('...nah')

save image created via pil to django model

img.save()

using multipartposthandler to post form-data with python

print(urllib.request.urlopen(request).read())

python regex alternative for join

re.sub('(?<=.)(?=.)', '-', s)

find all list permutations of a string in python

['m', 'o', 'n', 'k', 'e', 'y']

pythonic way to find maximum value and its index in a list?

max_index = my_list.index(max_value)

passing variables to a template on a redirect in python

self.redirect('/sucess')

how do i force django to ignore any caches and reload data?

MyModel.objects.get(id=1).my_field

sorting numbers in string format with python

keys.sort(key=lambda x: map(int, x.split('.')))

can't figure out how to bind the enter key to a function in tkinter

root.mainloop()

make subprocess find git executable on windows

proc = subprocess.Popen(['git', 'status'], stdout=subprocess.PIPE)

how to check if all items in the list are none?

not any(my_list)

how can i get the list of names used in a formatting string?

get_format_vars('hello %(foo)s there %(bar)s')

set columns `['race_date', 'track_code', 'race_number']` as indexes in dataframe `rdata`

rdata.set_index(['race_date', 'track_code', 'race_number'])

check if key 'stackoverflow' and key 'google' are presented in dictionary `sites`

set(['stackoverflow', 'google']).issubset(sites)

python pandas filtering out nan from a data selection of a column of strings

nms.dropna(thresh=2)

correct way of implementing cherrypy's autoreload module

cherrypy.quickstart(Root())

pythonic way to assign the parameter into attribute?

setattr(self, k, v)

getting the second to last element of list `some_list`

some_list[(-2)]

create a list containing elements from list `list` that are predicate to function `f`

[f(x) for x in list]

print a digit `your_number` with exactly 2 digits after decimal

print('{0:.2f}'.format(your_number))

sort list `mylist` alphabetically

mylist.sort(key=lambda x: x.lower())

python byte string encode and decode

"""foo""".decode('latin-1')

python: how to "fork" a session in django

return render(request, 'organisation/wall_post.html', {'form': form})

how to get an arbitrary element from a frozenset?

[random.sample(s, 1)[0] for _ in range(10)]

drop column based on a string condition

df.drop(df.columns[df.columns.str.match('chair')], axis=1)

add leading zeros to strings in pandas dataframe

df['ID'] = df['ID'].apply(lambda x: '{0:0>15}'.format(x))

sunflower scatter plot using matplotlib

plt.scatter(np.random.randn(100), np.random.randn(100), facecolors='none')

get a list of the keys in each dictionary in a dictionary of dictionaries `foo`

[k for d in list(foo.values()) for k in d]

sort dictionary `mydict` in descending order based on the sum of each value in it

sorted(iter(mydict.items()), key=lambda tup: sum(tup[1]), reverse=True)[:3]

django circular model reference

team = models.ForeignKey('Team')

match the pattern '[:;][)(](?![)(])' to the string `str`

re.match('[:;][)(](?![)(])', str)

add row `['8/19/2014', 'jun', 'fly', '98765']` to dataframe `df`

df.loc[len(df)] = ['8/19/2014', 'Jun', 'Fly', '98765']

matplotlib: formatting dates on the x-axis in a 3d bar graph

plt.show()

python - how to calculate equal parts of two dictionaries?

d3 = {k: list(set(d1.get(k, [])).intersection(v)) for k, v in list(d2.items())}

round number 1.005 up to 2 decimal places

round(1.005, 2)

pls-da algorithm in python

mypred = myplsda.predict(Xdata)

set the y axis range to `0, 1000` in subplot using pylab

pylab.ylim([0, 1000])

plotting categorical data with pandas and matplotlib

df.colour.value_counts().plot(kind='bar')

using python to extract dictionary keys within a list

names = [item['name'] for item in data]

how to sort pandas data frame using values from several columns?

df.sort(['c1', 'c2'], ascending=[False, True])

how can i get the previous week in python?

start_delta = datetime.timedelta(days=weekday, weeks=1)

generate a random 12-digit number

int(''.join(str(random.randint(0, 9)) for _ in range(12)))

functional statement in python to return the sum of certain lists in a list of lists

sum(len(y) for y in x if len(y) > 1)

set execute bit for a file using python

os.chmod('my_script.sh', 484)

convert hex string `hexstring` to int

int(hexString, 16)

multiple data set plotting with matplotlib.pyplot.plot_date

plt.show()

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

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

python: find in list

[i for i, x in enumerate([1, 2, 3, 2]) if x == 2]

python implementation of jenkins hash?

hash, hash2 = hashlittle2(hashstr, 3735928559, 3735928559)

if/else statements accepting strings in both capital and lower-case letters in python

"""3""".lower()

python: create a "with" block on several context managers

do_something()

add variable `var` to key 'f' of first element in json data `data`

data[0]['f'] = var

how to initialize a two-dimensional array in python?

[[Foo() for x in range(10)] for y in range(10)]

decode unicode string `s` into a readable unicode literal

s.decode('unicode_escape')