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eplace all the nan values with 0 in a pandas dataframe `df` | df.fillna(0) |
export a table dataframe `df` in pyspark to csv 'mycsv.csv' | df.toPandas().to_csv('mycsv.csv') |
Write DataFrame `df` to csv file 'mycsv.csv' | df.write.csv('mycsv.csv') |
get the sum of each second value from a list of tuple `structure` | sum(x[1] for x in structure) |
m the 3 largest integers in groupby by 'STNAME' and 'COUNTY_POP' | df.groupby('STNAME')['COUNTY_POP'].agg(lambda x: x.nlargest(3).sum()) |
Parse string '21/11/06 16:30' according to format '%d/%m/%y %H:%M' | datetime.strptime('21/11/06 16:30', '%d/%m/%y %H:%M') |
get current script directory | os.path.dirname(os.path.abspath(__file__)) |
double each character in string `text.read()` | re.sub('(.)', '\\1\\1', text.read(), 0, re.S) |
atenate strings in tuple `('a', 'b', 'c', 'd', 'g', 'x', 'r', 'e')` into a single string | """""".join(('a', 'b', 'c', 'd', 'g', 'x', 'r', 'e')) |
get full path of current directory | os.path.dirname(os.path.abspath(__file__)) |
variable number of digits `digits` in variable `value` in format string {0:.{1}%} | """{0:.{1}%}""".format(value, digits) |
get current requested url | self.request.url |
get a random item from list `choices` | random_choice = random.choice(choices) |
m the length of all strings in a list `strings` | length = sum(len(s) for s in strings) |
a list `s` by first and second attribute | s = sorted(s, key=lambda x: (x[1], x[2])) |
a list of lists `s` by second and third element in each list. | s.sort(key=operator.itemgetter(1, 2)) |
Mysql commit current transactio | con.commit() |
filtering out strings that contain 'ab' from a list of strings `lst` | [k for k in lst if 'ab' in k] |
find the first letter of each element in string `input` | output = ''.join(item[0].upper() for item in input.split()) |
get name of primary field `name` of django model `CustomPK` | CustomPK._meta.pk.name |
he number of words in a string `s` | len(s.split()) |
ltiply array `a` and array `b`respective elements then sum each row of the new array | np.einsum('ji,i->j', a, b) |
heck python versio | sys.version |
heck python versio | sys.version_info |
format number 1000000000.0 using latex notatio | print('\\num{{{0:.2g}}}'.format(1000000000.0)) |
alize a list of empty lists `x` of size 3 | x = [[] for i in range(3)] |
pply jinja2 filters `forceescape` and `linebreaks` on variable `my_variable` | {{my_variable | forceescape | linebreaks}} |
zip a list of tuples `[(1, 4), (2, 5), (3, 6)]` into a list of tuples according to original tuple index | zip(*[(1, 4), (2, 5), (3, 6)]) |
plit a list of tuples `data` into sublists of the same tuple field using itertool | [list(group) for key, group in itertools.groupby(data, operator.itemgetter(1))] |
Convert a string into a l | list('hello') |
eate new column `A_perc` in dataframe `df` with row values equal to the value in column `A` divided by the value in column `sum` | df['A_perc'] = df['A'] / df['sum'] |
getting a list of all subdirectories in the directory `directory` | os.walk(directory) |
get a list of all subdirectories in the directory `directory` | [x[0] for x in os.walk(directory)] |
pdate all values associated with key `i` to string 'updated' if value `j` is not equal to 'None' in dictionary `d` | {i: 'updated' for i, j in list(d.items()) if j != 'None'} |
Filter a dictionary `d` to remove keys with value None and replace other values with 'updated' | dict((k, 'updated') for k, v in d.items() if v is None) |
Filter a dictionary `d` to remove keys with value 'None' and replace other values with 'updated' | dict((k, 'updated') for k, v in d.items() if v != 'None') |
mber of rows in a group `key_columns` in pandas groupby object `df` | df.groupby(key_columns).size() |
eturn list `result` of sum of elements of each list `b` in list of lists `a` | result = [sum(b) for b in a] |
What's the best way to search for a Python dictionary value in a list of dictionaries? | any(d['site'] == 'Superuser' for d in data) |
eate a 2D array of `Node` objects with dimensions `cols` columns and `rows` row | nodes = [[Node() for j in range(cols)] for i in range(rows)] |
eplace extension '.txt' in basename '/home/user/somefile.txt' with extension '.jpg' | print(os.path.splitext('/home/user/somefile.txt')[0] + '.jpg') |
Set the resolution of a monitor as `FULLSCREEN` in pygame | pygame.display.set_mode((0, 0), pygame.FULLSCREEN) |
format float `3.5e+20` to `$3.5 \\times 10^{20}$` and set as title of matplotlib plot `ax` | ax.set_title('$%s \\times 10^{%s}$' % ('3.5', '+20')) |
Get the age of directory (or file) `/tmp` in seconds. | print(os.path.getmtime('/tmp')) |
how to get month name of datetime `today` | today.strftime('%B') |
get month name from a datetime object `today` | today.strftime('%B') |
Convert nested list `x` into a flat l | [j for i in x for j in i] |
get each value from a list of lists `a` using itertool | print(list(itertools.chain.from_iterable(a))) |
vert date string 'January 11, 2010' into day of week | datetime.datetime.strptime('January 11, 2010', '%B %d, %Y').strftime('%A') |
Convert Date String to Day of Week | datetime.datetime.strptime('January 11, 2010', '%B %d, %Y').strftime('%a') |
emove item b in list `a` | a.remove('b') |
emove item `c` in list `a` | a.remove(c) |
delete the element 6 from list `a` | a.remove(6) |
delete the element 6 from list `a` | a.remove(6) |
delete the element `c` from list `a` | if (c in a):
a.remove(c) |
delete the element `c` from list `a` | try:
a.remove(c)
except ValueError:
pass |
Get all matching patterns 'a.*?a' from a string 'a 1 a 2 a 3 a 4 a'. | re.findall('(?=(a.*?a))', 'a 1 a 2 a 3 a 4 a') |
er product of each column of a 2d `X` array to form a 3d array `X` | np.einsum('ij,kj->jik', X, X) |
Getting the last element of list `some_list` | some_list[(-1)] |
Getting the second to last element of list `some_list` | some_list[(-2)] |
gets the `n` thtolast element in list `some_list` | some_list[(- n)] |
get the last element in list `alist` | alist[(-1)] |
get the last element in list `astr` | astr[(-1)] |
ke a list of integers from 0 to `5` where each second element is a duplicate of the previous eleme | print([u for v in [[i, i] for i in range(5)] for u in v]) |
eate a list of integers with duplicate values `[0, 0, 1, 1, 2, 2, 3, 3, 4, 4]` | [0, 0, 1, 1, 2, 2, 3, 3, 4, 4] |
eate a list of integers from 1 to 5 with each value duplicated | [(i // 2) for i in range(10)] |
emove first and last lines of string `s` | s[s.find('\n') + 1:s.rfind('\n')] |
eate dict of squared int values in range of 100 | {(x ** 2) for x in range(100)} |
zip lists `[1, 2], [3, 4], [5, 6]` in a l | zip(*[[1, 2], [3, 4], [5, 6]]) |
zip lists in a list [[1, 2], [3, 4], [5, 6]] | zip(*[[1, 2], [3, 4], [5, 6]]) |
equest page 'https://www.mysite.com/' with credentials of username 'username' and password 'pwd' | requests.get('https://www.mysite.com/', auth=('username', 'pwd')) |
get a new string from the 3rd character to the end of the string `x` | x[2:] |
get a new string including the first two characters of string `x` | x[:2] |
get a new string including all but the last character of string `x` | x[:(-2)] |
get a new string including the last two characters of string `x` | x[(-2):] |
get a new string with the 3rd to the secondtolast characters of string `x` | x[2:(-2)] |
everse a string `some_string` | some_string[::(-1)] |
elect alternate characters of Hello World | 'H-e-l-l-o- -W-o-r-l-d'[::2] |
elect a substring of `s` beginning at `beginning` of length `LENGTH` | s = s[beginning:(beginning + LENGTH)] |
erminate the program | sys.exit() |
erminate the program | quit() |
Terminating a Python script with error message some error message | sys.exit('some error message') |
encode value of key `City` in dictionary `data` as `ascii`, ignoring nonascii character | data['City'].encode('ascii', 'ignore') |
get current CPU and RAM usage | psutil.cpu_percent()
psutil.virtual_memory() |
get current RAM usage of current program | pid = os.getpid()
py = psutil.Process(pid)
memoryUse = (py.memory_info()[0] / (2.0 ** 30)) |
print cpu and memory usage | print((psutil.cpu_percent()))
print((psutil.virtual_memory())) |
ead a ragged csv file `D:/Temp/tt.csv` using `names` parameter in pand | pd.read_csv('D:/Temp/tt.csv', names=list('abcdef')) |
get first nonnull value per each row from dataframe `df` | df.stack().groupby(level=0).first() |
print two numbers `10` and `20` using string formatting | """{0} {1}""".format(10, 20) |
eplace placeholders in string '{1} {ham} {0} {foo} {1}' with arguments `(10, 20, foo='bar', ham='spam')` | """{1} {ham} {0} {foo} {1}""".format(10, 20, foo='bar', ham='spam') |
eate list `changed_list ` containing elements of list `original_list` whilst converting strings containing digits to integer | changed_list = [(int(f) if f.isdigit() else f) for f in original_list] |
get a dictionary with keys from one list `keys` and values from other list `data` | dict(zip(keys, zip(*data))) |
vert string `apple` from iso88591/latin1 to utf8 | apple.decode('iso-8859-1').encode('utf8') |
Exclude column names when writing dataframe `df` to a csv file `filename.csv` | df.to_csv('filename.csv', header=False) |
Escape character '}' in string '{0}:<15}}{1}:<15}}{2}:<8}}' while using function `format` with arguments `('1', '2', '3')` | print('{0}:<15}}{1}:<15}}{2}:<8}}'.format('1', '2', '3')) |
get dictionary with max value of key 'size' in list of dicts `ld` | max(ld, key=lambda d: d['size']) |
format parameters 'b' and 'a' into plcaeholders in string {0}\\w{{2}}b{1}\\w{{2}}quarter | """{0}\\w{{2}}b{1}\\w{{2}}quarter""".format('b', 'a') |
django create a foreign key column `user` and link it to table 'User' | user = models.ForeignKey('User', unique=True) |
write a regex pattern to match even number of letter `A` | re.compile('^([^A]*)AA([^A]|AA)*$') |
join Numpy array `b` with Numpy array 'a' along axis 0 | b = np.concatenate((a, a), axis=0) |