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create a dictionary of pairs from a list of tuples `mylistoftuples`,dict(x[1:] for x in reversed(myListOfTuples)) |
categorize list in python,"list([x for x in totalist if x[:2] == ['A', 'B']])" |
check if the string `mystring` is empty,"if (not myString): |
pass" |
decode string `content` to utf-8 code,print(content.decode('utf8')) |
"reading freebase data dump in python, read to few lines?","open('file', 'rb')" |
finding missing values in a numpy array,m[~m.mask] |
convert a number 2130706433 to ip string,"socket.inet_ntoa(struct.pack('!L', 2130706433))" |
converting string to dict?,"ast.literal_eval(""{'x':1, 'y':2}"")" |
get the immediate minimum among a list of numbers in python,max([x for x in num_list if x < 3]) |
how do i access the request object or any other variable in a form's clean() method?,"myform = MyForm(request.POST, request=request)" |
format a datetime into a string with milliseconds,print(datetime.utcnow().strftime('%Y%m%d%H%M%S%f')) |
sorting list based on values from another list?,"[x for y, x in sorted(zip(Y, X))]" |
how do i use a regular expression to match a name?,"re.match('[a-zA-Z][\\w-]*$', 'A')" |
python turning a list into a list of tuples,"done = [(el, x) for el in [a, b, c, d]]" |
logging in a framework,log = logging.getLogger(__name__) |
"check whether a path ""/does/not/exist"" exists",print(os.path.exists('/does/not/exist')) |
equivalent of bash backticks in python,output = os.popen('cat /tmp/baz').read() |
get all characters in string 'foobar' up to the fourth index,"""""""foobar""""""[:4]" |
flask sqlalchemy query with keyword as variable,"User.query.filter_by(hometown='New York', university='USC')" |
returning the highest 6 names in a list of tuple in python,"heapq.nlargest(6, your_list, key=itemgetter(1))" |
how to split python script in parts and to import the parts in a loop?,time.sleep(1) |
create a flat dictionary by summing values associated with similar keys in each dictionary of list `dictlist`,"dict((key, sum(d[key] for d in dictList)) for key in dictList[0])" |
how to speed up the code - searching through a dataframe takes hours,df.head() |
how do i check if a list is sorted?,mylist.sort() |
changing the font on a wxpython textctrl widget,myTextCtrl.SetFont(font1) |
using spritesheets in tkinter,self.canvas.pack() |
django template convert to string,{{(value | stringformat): 'i'}} |
define global variable `something` with value `bob`,globals()['something'] = 'bob' |
beautiful soup using regex to find tags?,"soup.find_all(['a', 'div'])" |
python: logging module - globally,logger.debug('submodule message') |
os.getcwd() for a different drive in windows,os.chdir('z:') |
change one character in a string in python?,new = text[:1] + 'Z' + text[2:] |
get logical xor of `a` and `b`,(bool(a) ^ bool(b)) |
search for occurrences of regex pattern `pattern` in string `url`,print(pattern.search(url).group(1)) |
delete every non `utf-8` characters from a string `line`,"line = line.decode('utf-8', 'ignore').encode('utf-8')" |
pandas changing cell values based on another cell,df.sort_index(inplace=True) |
how do i compile a visual studio project from the command-line?,os.system('msbuild project.sln /p:Configuration=Debug') |
"find the maximum x,y value fromn a series of images","x = np.maximum(x, y)" |
"find element by css selector ""input[onclick*='1 bedroom deluxe']""","driver.find_element_by_css_selector(""input[onclick*='1 Bedroom Deluxe']"")" |
simple way to create matrix of random numbers,"numpy.random.random((3, 3))" |
python convert list to dictionary,"dict(zip(l[::2], l[1::2]))" |
slicing numpy array with another array,"numpy.ma.array(strided, mask=mask)" |
convert an int 65 to hex string,hex(65) |
remove parentheses and text within it in string `filename`,"re.sub('\\([^)]*\\)', '', filename)" |
find/extract a sequence of integers within a list in python,"[1, 2, 3, 4]" |
"how to do an inverse `range`, i.e. create a compact range based on a set of numbers?","[1, 1, 2, 2]" |
returning distinct rows in sqlalchemy with sqlite,session.query(Tag).distinct(Tag.name).group_by(Tag.name).count() |
how to find hidden attributes of python objects? (attributes that don't appear in the dir(obj) list),"['a', 'b', 'c', 'd'], ['a', 'b', 'c']" |
how to insert / retrieve a file stored as a blob in a mysql db using python,"cursor.execute(sql, (thedata,))" |
best way to plot an angle between two lines in matplotlib,"ax.set_ylim(0, 5)" |
get the date 1 month from today,"(date(2010, 12, 31) + relativedelta(months=(+ 1)))" |
python regex to get everything until the first dot in a string,find = re.compile('^(.*?)\\..*') |
python-requests close http connection,"r = requests.post(url=url, data=body, headers={'Connection': 'close'})" |
drawing cards from a deck in scipy with scipy.stats.hypergeom,"scipy.stats.hypergeom.pmf(k, M, n, N)" |
how can i do assignments in a list comprehension?,l = [[x for x in range(5)] for y in range(4)] |
selecting unique observations in a pandas data frame,"df.drop_duplicates(cols='uniqueid', inplace=True)" |
sort a list `your_list` of class objects by their values for the attribute `anniversary_score`,your_list.sort(key=operator.attrgetter('anniversary_score')) |
is there a way to use phantomjs in python?,driver.quit() |
how to call a system command with specified time limit in python?,"os.killpg(self.process.pid, signal.SIGTERM)" |
sort objects in `articles` in descending order of counts of `likes`,Article.objects.annotate(like_count=Count('likes')).order_by('-like_count') |
"make a line plot with errorbars, `ebar`, from data `x, y, err` and set color of the errorbars to `y` (yellow)","ebar = plt.errorbar(x, y, yerr=err, ecolor='y')" |
how to apply ceiling to pandas datetime,"df['date'] += np.array(-df['date'].dt.second % 60, dtype='<m8[s]')" |
get the number of rows in table using sqlalchemy,rows = session.query(Congress).count() |
doing math to a list in python,"[(3 * x) for x in [111, 222, 333]]" |
get rows that have the same value across its columns in pandas,"df[df.apply(lambda x: min(x) == max(x), 1)]" |
how to extract elements from a list in python?,"[a[i] for i in (1, 2, 5)]" |
what is the proper way to print a nested list with the highest value in python,"print(max(x, key=sum))" |
use groupby in pandas to count things in one column in comparison to another,"df.pivot_table(index='Event', columns='Status', aggfunc=len, fill_value=0)" |
get path from a module name,imp.find_module('os')[1] |
how to use opencv (python) to blur faces?,"cv2.rectangle(image, (x, y), (x + w, y + h), (255, 255, 0), 5)" |
"how to join two sets in one line without using ""|""","set([1, 2, 3]) | set([4, 5, 6])" |
how to get the resolution of a monitor in pygame?,"pygame.display.set_mode((0, 0), pygame.FULLSCREEN)" |
python pandas group by date using datetime data,df = df.groupby([df['Date_Time'].dt.date]).mean() |
switch every pair of characters in a string,"print(''.join(''.join(i) for i in zip(a2, a1)) + a[-1] if len(a) % 2 else '')" |
numeric sort in python,list1.sort(key=int) |
how do i use a regular expression to match a name?,"re.match('[a-zA-Z][\\w-]*$', '!A_B')" |
how to configure logging in python,logging.info('Doing something') |
terminate a python script from another python script,os.getpid() |
how sending and receiving works in python sockets?,"socket.socket(socket.AF_INET, socket.SOCK_DGRAM)" |
format string with dict `{'5': 'you'}` with integer keys,'hello there %(5)s' % {'5': 'you'} |
invert colors when plotting a png file using matplotlib,"plt.imshow(cv2.cvtColor(cube, cv2.COLOR_BGR2RGB))" |
how to change the order of dataframe columns?,"df = df[['mean', '0', '1', '2', '3']]" |
proper way to do row correlations in a pandas dataframe,"df_example.iloc[([1, 4]), :-1].T.corr()" |
"remove the punctuation '!', '.', ':' from a string `asking`","out = ''.join(c for c in asking if c not in ('!', '.', ':'))" |
check if type of a variable `s` is string,"isinstance(s, str)" |
numpy: how to select rows based on a bunch of criteria,"a[np.in1d(a[:, (1)], b)]" |
how can i lookup an attribute in any scope by name?,"getattr(__builtins__, 'range')" |
how to replace the nth element of multi dimension lists in python?,[list(e) for e in zip(*[fl[i::2] for i in range(2)])] |
python list initialization using multiple range statements,"list(range(1, 6)) + list(range(15, 20))" |
summing elements in a list,sum(your_list) |
how does one convert a .net tick to a python datetime?,"datetime.datetime(1, 1, 1) + datetime.timedelta(microseconds=ticks / 10)" |
combining two series into a dataframe in pandas,"pd.concat([s1, s2], axis=1).reset_index()" |
sort a list of lists `l` by index 2 of the inner list,"sorted(L, key=itemgetter(2))" |
removing control characters from a string `s`,return ''.join(ch for ch in s if unicodedata.category(ch)[0] != 'C') |
"how do i iterate over a python dictionary, ordered by values?","sorted(list(dictionary.items()), key=lambda x: x[1])" |
python list comprehension double for,[x.lower() for x in words] |
using a global flag for python regexp compile,"""""""(?s)Your.*regex.*here""""""" |
is there a function for converting ip address to decimal number in python?,"print(struct.unpack('!I', socket.inet_aton('127.0.0.1'))[0])" |
"in python, how to list all characters matched by posix extended regex `[:space:]`?","re.findall('\\s', chrs, re.UNICODE)" |
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