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sqlalchemy: how to order query results (order_by) on a relationship's field? | session.query(Base).join(Base.owner).order_by(Player.name) |
replace fields delimited by braces {} in string "day old bread, 50% sale {0}" with string 'today' | """Day old bread, 50% sale {0}""".format('today') |
how can i import a python module function dynamically? | my_function = getattr(__import__('my_apps.views'), 'my_function') |
how to retrieve executed sql code from sqlalchemy | session.commit() |
join two lists by interleaving | map(list, zip(charlist, numlist)) |
encoding an image file with base64 | encoded_string = base64.b64encode(image_file.read()) |
python: download a file over an ftp server | ftp.quit() |
how to create a function that outputs a matplotlib figure? | plt.figure().canvas.draw() |
python string match | mystring.find('subject') |
python max function using 'key' and lambda expression | max(lis, key=lambda x: x[1]) |
how can i indirectly call a macro in a jinja2 template? | print(template.render()) |
append dict `{'f': var6, 'g': var7, 'h': var8}` to value of key `e` in dict `jsobj['a']['b']` | jsobj['a']['b']['e'].append({'f': var6, 'g': var7, 'h': var8}) |
remove square bracket '[]' from pandas dataframe `df` column 'value' | df['value'] = df['value'].str.strip('[]') |
changing file extension in python | os.path.splitext('name.fasta')[0] + '.aln' |
how can i insert data into a mysql database? | conn.commit() |
how do i get the name of a python class as a string? | test.__name__ |
python list comprehensions: set all elements in an array to 0 or 1 | [0, 1, 0, 1, 0, 0, 1, 0] |
using python to write text files with dos line endings on linux | f.write('foo\nbar\nbaz\n') |
convert currency string `dollars` to decimal `cents_int` | cents_int = int(round(float(dollars.strip('$')) * 100)) |
stdout encoding in python | print('\xc5\xc4\xd6'.encode('UTF8')) |
python 2.7 : how to use beautifulsoup in google app engine? | sys.path.insert(0, 'libs') |
confirm urls in django properly | url('^$', include('sms.urls')), |
printing tabular data in python | print('%20s' % somevar) |
map two lists into a dictionary in python | zip(keys, values) |
sort a list 'lst' in descending order. | sorted(lst, reverse=True) |
list indexes of duplicate values in a list with python | print(list_duplicates([1, 2, 3, 2, 1, 5, 6, 5, 5, 5])) |
how do i make a django modelform menu item selected by default? | form = MyModelForm(initial={'gender': 'M'}) |
pandas: how do i select first row in each group by group? | df.drop_duplicates(subset='A') |
python - how to call bash commands with pipe? | subprocess.call('tar c my_dir | md5sum', shell=True) |
python, how to pass an argument to a function pointer parameter? | f(*args) |
using inheritance in python | super(Executive, self).__init__(*args) |
how to run scrapy from within a python script | process.start() |
how to set the font size of a canvas' text item? | canvas.create_text(x, y, font='Purisa', size=mdfont, text=k) |
how to check a string for specific characters? | any(i in '<string>' for i in ('11', '22', '33')) |
how to initialise a 2d array in python? | numpy.zeros((3, 3)) |
how do i find an element that contains specific text in selenium webdriver (python)? | driver.find_elements_by_xpath("//*[contains(text(), 'My Button')]") |
variable number of digits `digits` in variable `value` in format string "{0:.{1}%}" | """{0:.{1}%}""".format(value, digits) |
insert spaces before capital letters in string `text` | re.sub('([a-z](?=[A-Z])|[A-Z](?=[A-Z][a-z]))', '\\1 ', text) |
break values of one column into two columns | df['last_updated_time'] = d.dt.strftime('%H:%M:%S') |
generate a 12-digit random number | '%0.12d' % random.randint(0, 999999999999) |
merge two integers in python | z = int(str(x) + str(y)) |
how to make python format floats with certain amount of significant digits? | print('%.6g' % (i,)) |
google app engine datastore datetime to date in python? | datetime.strptime('2012-06-25 01:17:40.273000', '%Y-%m-%d %H:%M:%S.%f') |
finding index of maximum element from python list | from functools import reduce
reduce(lambda a, b: [a, b], [1, 2, 3, 4], 'seed') |
creating a color coded time chart using colorbar and colormaps in python | plt.show() |
create dictionary from list of variables | dict((k, globals()[k]) for k in ('foo', 'bar')) |
get all combination of 3 binary values | bin = [0, 1]
[(x, y, z) for x in bin for y in bin for z in bin] |
regular expression matching all but a string | res = re.findall('-(?!(?:aa|bb)-)([^-]+)(?=-)', s) |
how can i split this comma-delimited string in python? | mystring.split(',') |
faster way to remove outliers by group in large pandas dataframe | grouped = df.groupby(level='DATE') |
prepend string 'hello' to all items in list 'a' | ['hello{0}'.format(i) for i in a] |
max value within a list of lists of tuple | map(lambda x: max(x, key=lambda y: y[1]), lists) |
how to print variables without spaces between values | print('Value is "' + str(value) + '"') |
pyqt qtcpserver: how to return data to multiple clients? | app.exec_() |
delete the last column of numpy array `a` and assign resulting array to `b` | b = np.delete(a, -1, 1) |
iterating on a file using python | f.seek(0) |
add multiple columns to pandas dataframe from function | df[['hour', 'weekday', 'weeknum']] = df.apply(lambdafunc, axis=1) |
matplotlib: -- how to show all digits on ticks? | plt.show() |
remove periods inbetween capital letters that aren't immediately preceeded by word character(s) in a string `s` using regular expressions | re.sub('(?<!\\w)([A-Z])\\.', '\\1', s) |
how to specify test timeout for python unittest? | unittest.main() |
set values on the diagonal of pandas.dataframe | np.fill_diagonal(df.values, 0) |
get the union of values in list of lists `result_list` | return list(set(itertools.chain(*result_list))) |
matplotlib: align origin of right axis with specific left axis value | plt.show() |
sort python dict by datetime value | sorted(list(a.items()), key=itemgetter(1), reverse=True) |
rotating a two-dimensional array in python | original[::-1] |
concatenate two dataframes in pandas | pd.concat([df_a, df_b], axis=1) |
how to create unittests for python prompt toolkit? | unittest.main() |
easy pretty printing of floats in python? | print(['{0:0.2f}'.format(i) for i in a]) |
how to make a shallow copy of a list in python | newprefix = list(prefix) |
how to perform search on a list of tuples | [('jamy', 'Park', 'kick'), ('see', 'it', 'works')] |
python : getting the row which has the max value in groups using groupby | df.groupby(['Mt'], sort=False)['count'].max() |
match string 'this is my string' with regex '\\b(this|string)\\b'
then replace it with regex '<markup>\\1</markup>' | re.sub('\\b(this|string)\\b', '<markup>\\1</markup>', 'this is my string') |
how to efficiently compare two unordered lists (not sets) in python? | len(a) == len(b) and all(a.count(i) == b.count(i) for i in a) |
concurrency control in django model | super(ConcurrentModel, self).save(*args, **kwargs) |
pandas plotting with multi-index | summed_group.unstack(level=0).plot(kind='bar', subplots=True) |
write dataframe `df` to csv file 'mycsv.csv' | df.write.csv('mycsv.csv') |
make an http post request to upload a file using python urllib/urllib2 | response = requests.post(url, files=files) |
how do i convert datetime to date (in python)? | datetime.datetime.now().date() |
how to print a file to paper in python 3 on windows xp/7? | subprocess.call(['notepad', '/p', filename]) |
in python, is there an easy way to turn numbers with commas into an integer, and then back to numbers with commas? | s = '{0:,}'.format(n) |
pass a list of parameters `((1, 2, 3),) to sql queue 'select * from table where column in %s;' | cur.mogrify('SELECT * FROM table WHERE column IN %s;', ((1, 2, 3),)) |
python3 bytes to hex string | a.decode('ascii') |
how to read from a zip file within zip file in python? | return zipfile.ZipFile(path) |
strncmp in python | S2[:len(S1)] == S1 |
python insert numpy array into sqlite3 database | cur.execute('insert into test (arr) values (?)', (x,)) |
how to calculate quantiles in a pandas multiindex dataframe? | df.groupby(level=[0, 1]).median() |
delete the element 6 from list `a` | a.remove(6) |
match zero-or-more instances of lower case alphabet characters in a string `f233op ` | re.findall('([a-z])*', 'f233op') |
matplotlib: formatting dates on the x-axis in a 3d bar graph | ax.set_ylabel('Series') |
how to check a string for a special character? | print('Valid' if re.match('^[a-zA-Z0-9_]*$', word) else 'Invalid') |
sorting a list of lists of dictionaries in python | key = lambda x: sum(map(itemgetter('play'), x)) |
how to read integers from a file that are 24bit and little endian using python? | struct.unpack('<I', bytes + '\x00') |
how to reverse the elements in a sublist? | [sublist[::-1] for sublist in to_reverse[::-1]] |
list comprehension to extract a list of tuples from dictionary | [(movie_dict['title'], movie_dict['year']) for movie_dict in movie_dicts] |
print number 1255000 as thousands separators | locale.setlocale(locale.LC_ALL, 'en_US')
locale.format('%d', 1255000, grouping=True) |
multiply column 'a' and column 'b' by column 'c' in datafram `df` | df[['A', 'B']].multiply(df['C'], axis='index') |
how to make a histogram from a list of strings in python? | a = ['a', 'a', 'a', 'a', 'b', 'b', 'c', 'c', 'c', 'd', 'e', 'e', 'e', 'e', 'e'] |
can selenium web driver have access to javascript global variables? | browser.execute_script('return globalVar;') |
check if all string elements in list `words` are upper-cased | print(all(word[0].isupper() for word in words)) |
converting configparser values to python data types | literal_eval("{'key': 10}") |
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