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convert a list to a dictionary in python
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b = dict(zip(a[0::2], a[1::2]))
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python - sort a list of nested lists
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l.sort(key=sum_nested)
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how to get the size of a string in python?
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print(len('\xd0\xb9\xd1\x86\xd1\x8b'))
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how to get the fft of a numpy array to work?
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np.fft.fft(xfiltered)
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calculating difference between two rows in python / pandas
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data.set_index('Date').diff()
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efficient computation of the least-squares algorithm in numpy
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np.linalg.solve(np.dot(a.T, a), np.dot(a.T, b))
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how to add an image in tkinter (python 2.7)
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root.mainloop()
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matrix mirroring in python
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np.concatenate((A[::-1, :], A[1:, :]), axis=0)
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truth value of numpy array with one falsey element seems to depend on dtype
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np.array(['a', 'b']) != 0
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add column sum as new column in pyspark dataframe
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newdf = df.withColumn('total', sum(df[col] for col in df.columns))
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how to find elements by class
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soup.find_all('div', class_='stylelistrowone stylelistrowtwo')
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how to pad all the numbers in a string
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re.sub('\\d+', lambda x: x.group().zfill(padding), s)
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removing elements from an array that are in another array
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[[1, 1, 2], [1, 1, 3]]
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autofmt_xdate deletes x-axis labels of all subplots
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plt.setp(plt.xticks()[1], rotation=30, ha='right')
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looking for a simple opengl (3.2+) python example that uses glfw
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glfw.Terminate()
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reorder indexed rows `['z', 'c', 'a']` based on a list in pandas data frame `df`
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df.reindex(['Z', 'C', 'A'])
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issue sending email with python?
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server = smtplib.SMTP('smtp.gmail.com', 587)
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return rows of data associated with the maximum value of column 'value' in dataframe `df`
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df.loc[df['Value'].idxmax()]
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how to invoke a specific python version within a script.py -- windows
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print('World')
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set index equal to field 'trx_date' in dataframe `df`
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df = df.set_index(['TRX_DATE'])
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reference to an element in a list
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c[:] = b
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how to merge two columns together in pandas
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pd.melt(df, id_vars='Date')[['Date', 'value']]
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create svg / xml document without ns0 namespace using python elementtree
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etree.register_namespace('', 'http://www.w3.org/2000/svg')
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python - flatten a dict of lists into unique values?
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sorted({x for v in content.values() for x in v})
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argparse module how to add option without any argument?
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parser.add_argument('-s', '--simulate', action='store_true')
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un-escaping characters in a string with python
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"""\\u003Cp\\u003E""".decode('unicode-escape')
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cookies with urllib2 and pywebkitgtk
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opener = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(cj))
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how to unquote a urlencoded unicode string in python?
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urllib.parse.unquote('%0a')
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tensorflow: how to get a tensor by name?
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sess.run('add:0')
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how to extract links from a webpage using lxml, xpath and python?
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['http://stackoverflow.com/foobar', 'http://stackoverflow.com/baz']
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encode value of key `city` in dictionary `data` as `ascii`, ignoring non-ascii characters
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data['City'].encode('ascii', 'ignore')
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append 2 dimensional arrays to one single array
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array([[[1, 5], [2, 6]], [[3, 7], [4, 8]]])
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convert list of lists to delimited string
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result = '\n'.join('\t'.join(map(str, l)) for l in lists)
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pandas: how to run a pivot with a multi-index?
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df.groupby(['year', 'month', 'item'])['value'].sum().unstack('item')
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python: sort a list of lists by an item in the sublist
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sorted(li, key=operator.itemgetter(1), reverse=True)
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get key by value in dictionary with same value in python?
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print([key for key, value in list(d.items()) if value == 1])
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how do you create nested dict in python?
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dict(d)
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how to replace unicode characters in string with something else python?
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str.decode('utf-8')
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get count of values associated with key in dict python
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sum(1 if d['success'] else 0 for d in s)
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access item in a list of lists
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50 - list1[0][0] + list1[0][1] - list1[0][2]
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python how to get every first element in 2 dimensional list `a`
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[i[0] for i in a]
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find the element that holds string 'text a' in file `root`
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e = root.xpath('.//a[text()="TEXT A"]')
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how to get the content of a html page in python
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"""""".join(soup.findAll(text=True))
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joining two numpy matrices
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np.hstack([X, Y])
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how to center labels in histogram plot
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ax.set_xticklabels(('1', '2', '3', '4'))
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interprocess communication in python
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socket.send('...nah')
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save image created via pil to django model
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img.save()
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using multipartposthandler to post form-data with python
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print(urllib.request.urlopen(request).read())
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python regex alternative for join
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re.sub('(?<=.)(?=.)', '-', s)
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find all list permutations of a string in python
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['m', 'o', 'n', 'k', 'e', 'y']
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pythonic way to find maximum value and its index in a list?
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max_index = my_list.index(max_value)
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passing variables to a template on a redirect in python
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self.redirect('/sucess')
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how do i force django to ignore any caches and reload data?
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MyModel.objects.get(id=1).my_field
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sorting numbers in string format with python
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keys.sort(key=lambda x: map(int, x.split('.')))
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can't figure out how to bind the enter key to a function in tkinter
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root.mainloop()
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make subprocess find git executable on windows
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proc = subprocess.Popen(['git', 'status'], stdout=subprocess.PIPE)
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how to check if all items in the list are none?
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not any(my_list)
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how can i get the list of names used in a formatting string?
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get_format_vars('hello %(foo)s there %(bar)s')
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set columns `['race_date', 'track_code', 'race_number']` as indexes in dataframe `rdata`
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rdata.set_index(['race_date', 'track_code', 'race_number'])
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check if key 'stackoverflow' and key 'google' are presented in dictionary `sites`
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set(['stackoverflow', 'google']).issubset(sites)
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python pandas filtering out nan from a data selection of a column of strings
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nms.dropna(thresh=2)
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correct way of implementing cherrypy's autoreload module
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cherrypy.quickstart(Root())
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pythonic way to assign the parameter into attribute?
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setattr(self, k, v)
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getting the second to last element of list `some_list`
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some_list[(-2)]
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create a list containing elements from list `list` that are predicate to function `f`
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[f(x) for x in list]
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print a digit `your_number` with exactly 2 digits after decimal
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print('{0:.2f}'.format(your_number))
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sort list `mylist` alphabetically
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mylist.sort(key=lambda x: x.lower())
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python byte string encode and decode
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"""foo""".decode('latin-1')
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python: how to "fork" a session in django
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return render(request, 'organisation/wall_post.html', {'form': form})
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how to get an arbitrary element from a frozenset?
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[random.sample(s, 1)[0] for _ in range(10)]
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drop column based on a string condition
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df.drop(df.columns[df.columns.str.match('chair')], axis=1)
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add leading zeros to strings in pandas dataframe
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df['ID'] = df['ID'].apply(lambda x: '{0:0>15}'.format(x))
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sunflower scatter plot using matplotlib
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plt.scatter(np.random.randn(100), np.random.randn(100), facecolors='none')
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get a list of the keys in each dictionary in a dictionary of dictionaries `foo`
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[k for d in list(foo.values()) for k in d]
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sort dictionary `mydict` in descending order based on the sum of each value in it
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sorted(iter(mydict.items()), key=lambda tup: sum(tup[1]), reverse=True)[:3]
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django circular model reference
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team = models.ForeignKey('Team')
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match the pattern '[:;][)(](?![)(])' to the string `str`
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re.match('[:;][)(](?![)(])', str)
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add row `['8/19/2014', 'jun', 'fly', '98765']` to dataframe `df`
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df.loc[len(df)] = ['8/19/2014', 'Jun', 'Fly', '98765']
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matplotlib: formatting dates on the x-axis in a 3d bar graph
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plt.show()
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python - how to calculate equal parts of two dictionaries?
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d3 = {k: list(set(d1.get(k, [])).intersection(v)) for k, v in list(d2.items())}
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round number 1.005 up to 2 decimal places
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round(1.005, 2)
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pls-da algorithm in python
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mypred = myplsda.predict(Xdata)
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set the y axis range to `0, 1000` in subplot using pylab
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pylab.ylim([0, 1000])
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plotting categorical data with pandas and matplotlib
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df.colour.value_counts().plot(kind='bar')
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using python to extract dictionary keys within a list
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names = [item['name'] for item in data]
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how to sort pandas data frame using values from several columns?
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df.sort(['c1', 'c2'], ascending=[False, True])
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how can i get the previous week in python?
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start_delta = datetime.timedelta(days=weekday, weeks=1)
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generate a random 12-digit number
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int(''.join(str(random.randint(0, 9)) for _ in range(12)))
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functional statement in python to return the sum of certain lists in a list of lists
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sum(len(y) for y in x if len(y) > 1)
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set execute bit for a file using python
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os.chmod('my_script.sh', 484)
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convert hex string `hexstring` to int
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int(hexString, 16)
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multiple data set plotting with matplotlib.pyplot.plot_date
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plt.show()
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execute python code `myscript.py` in a virtualenv `/path/to/my/venv` from matlab
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system('/path/to/my/venv/bin/python myscript.py')
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python: find in list
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[i for i, x in enumerate([1, 2, 3, 2]) if x == 2]
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python implementation of jenkins hash?
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hash, hash2 = hashlittle2(hashstr, 3735928559, 3735928559)
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if/else statements accepting strings in both capital and lower-case letters in python
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"""3""".lower()
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python: create a "with" block on several context managers
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do_something()
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add variable `var` to key 'f' of first element in json data `data`
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data[0]['f'] = var
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how to initialize a two-dimensional array in python?
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[[Foo() for x in range(10)] for y in range(10)]
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decode unicode string `s` into a readable unicode literal
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s.decode('unicode_escape')
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