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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') |
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