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how to change user-agent on google app engine urlfetch service? | urlfetch.fetch(url, headers={'User-Agent': 'MyApplication_User-Agent'}) |
how to render a doctype with python's xml.dom.minidom? | print(doc.toxml()) |
pandas joining multiple dataframes on columns | df1.merge(df2, on='name').merge(df3, on='name') |
is there a matplotlib counterpart of matlab "stem3"? | plt.show() |
compare python pandas dataframes for matching rows | pd.merge(df1, df2, on=['A', 'B', 'C', 'D'], how='inner') |
symlinks on windows? | kdll.CreateSymbolicLinkW('D:\\testdirLink', 'D:\\testdir', 1) |
can i use a class attribute as a default value for an instance method? | my_instance = MyClass(name='new name') |
removing items from a nested list python | [[j for j in families[i] if i != j] for i in range(len(families))] |
reading array from config file in python | config.get('common', 'folder').split('\n') |
python pandas -- merging mostly duplicated rows | grouped = data.groupby(['date', 'name']) |
python sorting list of dictionaries by multiple keys | mylist = sorted(mylist, key=lambda k: (k['name'].lower(), -k['age'])) |
sorting a list of tuples with multiple conditions | sorted_by_length = sorted(list_, key=lambda x: (x[0], len(x[1]), float(x[1]))) |
split a string into 2 in python | firstpart, secondpart = string[:len(string) / 2], string[len(string) / 2:] |
replace parentheses and all data within it with empty string '' in column 'name' of dataframe `df` | df['name'].str.replace('\\(.*\\)', '') |
using pandas, how do i subsample a large dataframe by group in an efficient manner? | subsampled = df.ix[(choice(x) for x in list(grouped.groups.values()))] |
cross product of a vector in numpy | np.cross(a, b, axis=0) |
applying borders to a cell in openpyxl | wb.save('border_test.xlsx') |
most efficient way in python to iterate over a large file (10gb+) | collections.Counter(map(uuid, open('log.txt'))) |
order a list of lists `l1` by the first value | l1.sort(key=lambda x: int(x[0])) |
how to produce an exponentially scaled axis? | plt.show() |
how do i get the raw representation of a string in python? | print(rawstr(test7)) |
how to get the indices list of all nan value in numpy array? | array([[1, 2], [2, 0]]) |
merge two lists `a` and `b` into a single list | [j for i in zip(a, b) for j in i] |
summarizing dataframe into a dictionary | df.groupby('date')['level'].first().apply(np.ceil).astype(int).to_dict() |
plotting a 2d array with matplotlib | plt.show() |
sort list of strings `the_list` by integer suffix before "_" | sorted(the_list, key=lambda x: int(x.split('_')[1])) |
how do i get rid of python tkinter root window? | root.destroy() |
make new column 'c' in panda dataframe by adding values from other columns 'a' and 'b' | df['C'] = df['A'] + df['B'] |
how do i sort a python list of time values? | sorted(['14:10:01', '03:12:08']) |
splitting dictionary/list inside a pandas column into separate columns | pd.concat([df.drop('b', axis=1), pd.DataFrame(df['b'].tolist())], axis=1) |
how to plot a gradient color line in matplotlib? | plt.show() |
sorting python list based on the length of the string | xs.sort(lambda x, y: cmp(len(x), len(y))) |
how to get the concrete class name as a string? | instance.__class__.__name__ |
regex to match 'lol' to 'lolllll' and 'omg' to 'omggg', etc | re.sub('l+', 'l', 'lollll') |
is there a way to copy only the structure (not the data) of a pandas dataframe? | df2 = pd.DataFrame(data=None, columns=df1.columns, index=df1.index) |
pythonic way to filter list for elements with unique length | list({len(s): s for s in jones}.values()) |
convert numbers to grades in python list | li = map(lambda x: '{0} - {1}'.format(x, grade(x)), s) |
matplotlib: is a changing background color possible? | plt.axvspan(x, x2, facecolor='g', alpha=0.5) |
python: create list of tuples from lists | z = zip(x, y) |
dynamic module import in python | my_module = importlib.import_module('os.path') |
building up an array in numpy/scipy by iteration in python? | array([0, 1, 4, 9, 16]) |
check if dictionary `d` contains all keys in list `['somekey', 'someotherkey', 'somekeyggg']` | all(word in d for word in ['somekey', 'someotherkey', 'somekeyggg']) |
convert list of tuples to multiple lists in python | map(list, zip(*[(1, 2), (3, 4), (5, 6)])) |
list all ".txt" files of a directory "/home/adam/" | print(glob.glob('/home/adam/*.txt')) |
5 maximum values in a python dictionary | max(A, key=A.get) |
splitting a string into a list (but not separating adjacent numbers) in python | [el for el in re.split('(\\d+)', string) if el.strip()] |
change current working directory in python | os.chdir('chapter3') |
how to send multiple input field values with same name? | relations = request.POST.getlist('relations') |
get value of first child of xml node `name` | name[0].firstChild.nodeValue |
in python, how to join a list of tuples into one list? | b = [i for sub in a for i in sub] |
how to create a hyperlink with a label in tkinter? | webbrowser.open_new('file://c:\\test\\test.csv') |
how to rewrite output in terminal | sys.stdout.flush() |
python: split string with multiple delimiters | re.split('; |, ', str) |
remove a substring ".com" from the end of string `url` | url = re.sub('\\.com$', '', url) |
how to smooth matplotlib contour plot? | plt.show() |
index the first and the last n elements of a list | l[:3] + l[-3:] |
changing time frequency in pandas dataframe | new = df.resample('T', how='mean') |
change the background colour of the button `pushbutton` to red | self.pushButton.setStyleSheet('background-color: red') |
what's a quick one-liner to remove empty lines from a python string? | text = os.linesep.join([s for s in text.splitlines() if s]) |
how to get the name of an open file? | print(os.path.basename(sys.argv[0])) |
equivalent of j in numpy | np.array([1j]) |
truncate `\r\n` from each string in a list of string `example` | example = [x.replace('\r\n', '') for x in example] |
how to check if string has the same characters in python | len(set('aaaa')) == 1 |
how to convert from infix to postfix/prefix using ast python module? | ['x', 'cos'] |
how to calculate next friday in python? | d += datetime.timedelta(1) |
a list > a list of lists | [['1', 'a', 'b'], ['2', 'c', 'd'], ['3', '123', 'e'], ['4']] |
list comprehension that produces integers between 11 and 19 | [i for i in range(100) if i > 10 if i < 20] |
how to add a new row to an empty numpy array | arr = np.append(arr, np.array([[4, 5, 6]]), axis=0) |
php's strtr for python | print(strtr('aa-bb-cc', {'aa': 'bbz', 'bb': 'x', 'cc': 'y'})) |
plotting arrows with different color in matplotlib | plt.show() |
get rows that have the same value across its columns in pandas | df.apply(pd.Series.nunique, axis=1) |
adding values from tuples of same length | coord = tuple(sum(x) for x in zip(coord, change)) |
how to check if a column exists in pandas | df['sum'] = df['A'] + df['C'] |
using a conditional in the python interpreter -c command | python - mplatform |
python print array with new line | print('\n'.join(op)) |
how to avoid python/pandas creating an index in a saved csv? | pd.to_csv('your.csv', index=False) |
how to remove multiple columns that end with same text in pandas? | df.select(lambda x: re.search('prefix$', str(x)) is None, axis=1) |
running python code contained in a string | eval("print('Hello')") |
mutli-threading python with tkinter | root.mainloop() |
what pandas data type is passed to transform or apply in a groupby | df.groupby(['category'])[['data_1', 'data_2']].transform(f) |
calling an external command "ls -l" | call(['ls', '-l']) |
divide the values of two dictionaries in python | {k: (float(d2[k]) / d1[k]) for k in d2} |
read from a gzip file in python | f.close() |
check if all values of iterable are zero | list(l) == [0] * len(l) |
how can i do multiple substitutions using regex in python? | re.sub('([characters])', '\\1\\1', text.read()) |
check if "blah" is in string `somestring` | if ('blah' not in somestring):
pass |
3d plot with matplotlib | ax.plot_surface(x, y, z, rstride=10, cstride=10, alpha=0.3) |
replace repeated instances of "*" with a single instance of "*" | re.sub('\\*+', '*', text) |
how to convert a list of multiple integers into a single integer? | x = [1, 3, 5] |
how to create a menu and submenus in python curses? | curses.doupdate() |
reverse string 'foo' | ''.join(reversed('foo')) |
how to merge two dataframe in pandas to replace nan | a.where(~np.isnan(a), other=b, inplace=True) |
generate md5 checksum of file in the path `full_path` in hashlib | print(hashlib.md5(open(full_path, 'rb').read()).hexdigest()) |
how do i add space between two variables after a print in python | print(str(count) + ' ' + str(conv)) |
how to convert a hex string to hex number | print(hex(new_int)[2:]) |
stop infinite page load in selenium webdriver - python | driver.send_keys(Keys.CONTROL + 'Escape') |
python json encoding | json.dumps({'apple': 'cat', 'banana': 'dog', 'pear': 'fish'}) |
python: display special characters when using print statement | print(repr(a).replace(' ', '\\s')) |
extract values not equal to 0 from numpy array `a` | a[a != 0] |
capturing emoticons using regular expression in python | re.match('[:;][)(](?![)(])', str) |
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