Datasets:

janrauhl

/

conala

like 0

replace all the nan values with 0 in a pandas dataframe `df`

How can I replace all the NaN values with Zero's in a column of a pandas dataframe

df.fillna(0)

export a table dataframe `df` in pyspark to csv 'mycsv.csv'

how to export a table dataframe in pyspark to csv?

df.toPandas().to_csv('mycsv.csv')

Write DataFrame `df` to csv file 'mycsv.csv'

how to export a table dataframe in pyspark to csv?

df.write.csv('mycsv.csv')

get the sum of each second value from a list of tuple `structure`

Sum the second value of each tuple in a list

sum(x[1] for x in structure)

sum the 3 largest integers in groupby by 'STNAME' and 'COUNTY_POP'

How to sum the nlargest() integers in groupby

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'

what would be the python code to add time to a specific timestamp?

datetime.strptime('21/11/06 16:30', '%d/%m/%y %H:%M')

get current script directory

How to properly determine current script directory in Python?

os.path.dirname(os.path.abspath(__file__))

double each character in string `text.read()`

How can I do multiple substitutions using regex in python?

re.sub('(.)', '\\1\\1', text.read(), 0, re.S)

concatenate strings in tuple `('a', 'b', 'c', 'd', 'g', 'x', 'r', 'e')` into a single string

Python convert tuple to string

"""""".join(('a', 'b', 'c', 'd', 'g', 'x', 'r', 'e'))

get full path of current directory

How to get full path of current file's directory in Python?

os.path.dirname(os.path.abspath(__file__))

variable number of digits `digits` in variable `value` in format string "{0:.{1}%}"

variable number of digit in format string

"""{0:.{1}%}""".format(value, digits)

get current requested url

Get current URL in Python

self.request.url

get a random item from list `choices`

Print a variable selected by a random number

random_choice = random.choice(choices)

sum the length of all strings in a list `strings`

Python: Sum string lengths

length = sum(len(s) for s in strings)

sort a list `s` by first and second attributes

Sort a list by multiple attributes?

s = sorted(s, key=lambda x: (x[1], x[2]))

sort a list of lists `s` by second and third element in each list.

Sort a list by multiple attributes?

s.sort(key=operator.itemgetter(1, 2))

Mysql commit current transaction

How to disable query cache with mysql.connector

con.commit()

filtering out strings that contain 'ab' from a list of strings `lst`

Filtering a list of strings based on contents

[k for k in lst if 'ab' in k]

find the first letter of each element in string `input`

How do I find the first letter of each word?

output = ''.join(item[0].upper() for item in input.split())

get name of primary field `name` of django model `CustomPK`

Get name of primary field of Django model

CustomPK._meta.pk.name

count the number of words in a string `s`

How to count the number of words in a sentence?

len(s.split())

multiply array `a` and array `b`respective elements then sum each row of the new array

numpy matrix vector multiplication

np.einsum('ji,i->j', a, b)

check python version

check what version of Python is running

sys.version

check python version

check what version of Python is running

sys.version_info

format number 1000000000.0 using latex notation

Format number using LaTeX notation in Python

print('\\num{{{0:.2g}}}'.format(1000000000.0))

Initialize a list of empty lists `x` of size 3

Python initializing a list of lists

x = [[] for i in range(3)]

apply jinja2 filters `forceescape` and `linebreaks` on variable `my_variable`

How to apply django/jinja2 template filters 'escape' and 'linebreaks' correctly?

{{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

Split a list of tuples into sub-lists of the same tuple field

zip(*[(1, 4), (2, 5), (3, 6)])

split a list of tuples `data` into sub-lists of the same tuple field using itertools

Split a list of tuples into sub-lists of the same tuple field

[list(group) for key, group in itertools.groupby(data, operator.itemgetter(1))]

Convert a string into a list

How can I turn a string into a list in Python?

list('hello')

create new column `A_perc` in dataframe `df` with row values equal to the value in column `A` divided by the value in column `sum`

pandas dataframe create new columns and fill with calculated values from same df

df['A_perc'] = df['A'] / df['sum']

getting a list of all subdirectories in the directory `directory`

Getting a list of all subdirectories in the current directory

os.walk(directory)

get a list of all subdirectories in the directory `directory`

Getting a list of all subdirectories in the current directory

[x[0] for x in os.walk(directory)]

update all values associated with key `i` to string 'updated' if value `j` is not equal to 'None' in dictionary `d`

How to filter a dictionary in Python?

{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'

How to filter a dictionary in Python?

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'

How to filter a dictionary in Python?

dict((k, 'updated') for k, v in d.items() if v != 'None')

count number of rows in a group `key_columns` in pandas groupby object `df`

How to count number of rows in a group in pandas group by object?

df.groupby(key_columns).size()

return list `result` of sum of elements of each list `b` in list of lists `a`

python sum the values of lists of list

result = [sum(b) for b in a]

What's the best way to search for a Python dictionary value in a list of dictionaries?

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)

create a 2D array of `Node` objects with dimensions `cols` columns and `rows` rows

2D array of objects in Python

nodes = [[Node() for j in range(cols)] for i in range(rows)]

replace extension '.txt' in basename '/home/user/somefile.txt' with extension '.jpg'

How to replace (or strip) an extension from a filename in Python?

print(os.path.splitext('/home/user/somefile.txt')[0] + '.jpg')

Set the resolution of a monitor as `FULLSCREEN` in pygame

How to get the resolution of a monitor 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`

How can I format a float using matplotlib's LaTeX formatter?

ax.set_title('$%s \\times 10^{%s}$' % ('3.5', '+20'))

Get the age of directory (or file) `/tmp` in seconds.

Print file age in seconds using Python

print(os.path.getmtime('/tmp'))

how to get month name of datetime `today`

(Django) how to get month name?

today.strftime('%B')

get month name from a datetime object `today`

(Django) how to get month name?

today.strftime('%B')

Convert nested list `x` into a flat list

join list of lists in python

[j for i in x for j in i]

get each value from a list of lists `a` using itertools

join list of lists in python

print(list(itertools.chain.from_iterable(a)))

convert date string 'January 11, 2010' into day of week

Convert Date String to 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')

remove item "b" in list `a`

delete a list element by value

a.remove('b')

remove item `c` in list `a`

delete a list element by value

a.remove(c)

delete the element 6 from list `a`

delete a list element by value

a.remove(6)

delete the element 6 from list `a`

delete a list element by value

a.remove(6)

delete the element `c` from list `a`

delete a list element by value

if (c in a): a.remove(c)

delete the element `c` from list `a`

delete a list element by value

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'.

Python re.findall print all patterns

re.findall('(?=(a.*?a))', 'a 1 a 2 a 3 a 4 a')

outer product of each column of a 2d `X` array to form a 3d array `X`

Outer product of each column of a 2D array to form a 3D array - NumPy

np.einsum('ij,kj->jik', X, X)

Getting the last element of list `some_list`

Getting the last element of a list

some_list[(-1)]

Getting the second to last element of list `some_list`

Getting the last element of a list

some_list[(-2)]

gets the `n` th-to-last element in list `some_list`

gets the nth-to-last element

some_list[(- n)]

get the last element in list `alist`

Getting the last element of a list

alist[(-1)]

get the last element in list `astr`

Getting the last element of a list

astr[(-1)]

make a list of integers from 0 to `5` where each second element is a duplicate of the previous element

Create a list of integers with duplicate values in Python

print([u for v in [[i, i] for i in range(5)] for u in v])

create a list of integers with duplicate values `[0, 0, 1, 1, 2, 2, 3, 3, 4, 4]`

Create a list of integers with duplicate values in Python

[0, 0, 1, 1, 2, 2, 3, 3, 4, 4]

create a list of integers from 1 to 5 with each value duplicated

Create a list of integers with duplicate values in Python

[(i // 2) for i in range(10)]

remove first and last lines of string `s`

Fastest way to remove first and last lines from a Python string

s[s.find('\n') + 1:s.rfind('\n')]

create dict of squared int values in range of 100

Is there a Python dict without values?

{(x ** 2) for x in range(100)}

zip lists `[1, 2], [3, 4], [5, 6]` in a list

How to zip lists in a list

zip(*[[1, 2], [3, 4], [5, 6]])

zip lists in a list [[1, 2], [3, 4], [5, 6]]

How to zip lists in a list

zip(*[[1, 2], [3, 4], [5, 6]])

request page 'https://www.mysite.com/' with credentials of username 'username' and password 'pwd'

python http request with token

requests.get('https://www.mysite.com/', auth=('username', 'pwd'))

get a new string from the 3rd character to the end of the string `x`

get a new string from the 3rd character to the end of the string

x[2:]

get a new string including the first two characters of string `x`

substring a string

x[:2]

get a new string including all but the last character of string `x`

substring a string

x[:(-2)]

get a new string including the last two characters of string `x`

substring a string

x[(-2):]

get a new string with the 3rd to the second-to-last characters of string `x`

substring a string

x[2:(-2)]

reverse a string `some_string`

reversing a string

some_string[::(-1)]

select alternate characters of "H-e-l-l-o- -W-o-r-l-d"

selecting alternate characters

'H-e-l-l-o- -W-o-r-l-d'[::2]

select a substring of `s` beginning at `beginning` of length `LENGTH`

substring a string

s = s[beginning:(beginning + LENGTH)]

terminate the program

Terminating a Python script

sys.exit()

terminate the program

Terminating a Python script

quit()

Terminating a Python script with error message "some error message"

Terminating a Python script

sys.exit('some error message')

encode value of key `City` in dictionary `data` as `ascii`, ignoring non-ascii characters

Transform unicode string in python

data['City'].encode('ascii', 'ignore')

get current CPU and RAM usage

get current CPU and RAM usage

psutil.cpu_percent() psutil.virtual_memory()

get current RAM usage of current program

get current CPU and RAM usage

pid = os.getpid() py = psutil.Process(pid) memoryUse = (py.memory_info()[0] / (2.0 ** 30))

print cpu and memory usage

get current CPU and RAM usage

print((psutil.cpu_percent())) print((psutil.virtual_memory()))

read a ragged csv file `D:/Temp/tt.csv` using `names` parameter in pandas

Pandas read_csv expects wrong number of columns, with ragged csv file

pd.read_csv('D:/Temp/tt.csv', names=list('abcdef'))

get first non-null value per each row from dataframe `df`

First non-null value per row from a list of Pandas columns

df.stack().groupby(level=0).first()

print two numbers `10` and `20` using string formatting

format strings and named arguments in Python

"""{0} {1}""".format(10, 20)

replace placeholders in string '{1} {ham} {0} {foo} {1}' with arguments `(10, 20, foo='bar', ham='spam')`

format strings and named arguments in Python

"""{1} {ham} {0} {foo} {1}""".format(10, 20, foo='bar', ham='spam')

create list `changed_list ` containing elements of list `original_list` whilst converting strings containing digits to integers

How to convert strings numbers to integers in a list?

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`

Add items to a dictionary of lists

dict(zip(keys, zip(*data)))

convert string `apple` from iso-8859-1/latin1 to utf-8

Python: Converting from ISO-8859-1/latin1 to UTF-8

apple.decode('iso-8859-1').encode('utf8')

Exclude column names when writing dataframe `df` to a csv file `filename.csv`

How do you remove the column name row from a pandas DataFrame?

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')`

how to get around "Single '}' encountered in format string" when using .format and formatting in printing

print('{0}:<15}}{1}:<15}}{2}:<8}}'.format('1', '2', '3'))

get dictionary with max value of key 'size' in list of dicts `ld`

Python list of dicts, get max value index

max(ld, key=lambda d: d['size'])

format parameters 'b' and 'a' into plcaeholders in string "{0}\\w{{2}}b{1}\\w{{2}}quarter"

Format() in Python Regex

"""{0}\\w{{2}}b{1}\\w{{2}}quarter""".format('b', 'a')

django create a foreign key column `user` and link it to table 'User'

How to use 'User' as foreign key in Django 1.5

user = models.ForeignKey('User', unique=True)

write a regex pattern to match even number of letter `A`

Regex match even number of letters

re.compile('^([^A]*)AA([^A]|AA)*$')

join Numpy array `b` with Numpy array 'a' along axis 0

Combining NumPy arrays

b = np.concatenate((a, a), axis=0)