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

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

df.fillna(0)

how to export a table dataframe in pyspark to csv?

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

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

how to export a table dataframe in pyspark to csv?

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

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

Sum the second value of each tuple in a list

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

sum(x[1] for x in structure)

How to sum the nlargest() integers in groupby

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

df.groupby('STNAME')['COUNTY_POP'].agg(lambda x: x.nlargest(3).sum())

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

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')

How to properly determine current script directory in Python?

get current script directory

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

How can I do multiple substitutions using regex in python?

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

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

Python convert tuple to string

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

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

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

get full path of current directory

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

variable number of digit in format string

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

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

Get current URL in Python

get current requested url

self.request.url

Print a variable selected by a random number

get a random item from list `choices`

random_choice = random.choice(choices)

Python: Sum string lengths

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

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

Sort a list by multiple attributes?

sort a list `s` by first and second attributes

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

Sort a list by multiple attributes?

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

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

How to disable query cache with mysql.connector

Mysql commit current transaction

con.commit()

Filtering a list of strings based on contents

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

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

How do I find the first letter of each word?

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 of Django model

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

CustomPK._meta.pk.name

How to count the number of words in a sentence?

count the number of words in a string `s`

len(s.split())

numpy matrix vector multiplication

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

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

check what version of Python is running

check python version

sys.version

check what version of Python is running

check python version

sys.version_info

Format number using LaTeX notation in Python

format number 1000000000.0 using latex notation

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

Python initializing a list of lists

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

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

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

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

{{my_variable | forceescape | linebreaks}}

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

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)])

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

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

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

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

Convert a string into a list

list('hello')

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

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`

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

Getting a list of all subdirectories in the current directory

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

os.walk(directory)

Getting a list of all subdirectories in the current directory

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

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

How to filter a dictionary in Python?

update 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'}

How to filter a dictionary in Python?

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)

How to filter a dictionary in Python?

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')

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

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

df.groupby(key_columns).size()

python sum the values of lists of list

return 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?

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)

2D array of objects in Python

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

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

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

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

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

How to get the resolution of a monitor in Pygame?

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

pygame.display.set_mode((0, 0), pygame.FULLSCREEN)

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

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'))

Print file age in seconds using Python

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

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

(Django) how to get month name?

how to get month name of datetime `today`

today.strftime('%B')

(Django) how to get month name?

get month name from a datetime object `today`

today.strftime('%B')

join list of lists in python

Convert nested list `x` into a flat list

[j for i in x for j in i]

join list of lists in python

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

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

Convert Date String to Day of Week

convert 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')

delete a list element by value

remove item "b" in list `a`

a.remove('b')

delete a list element by value

remove item `c` in list `a`

a.remove(c)

delete a list element by value

delete the element 6 from list `a`

a.remove(6)

delete a list element by value

delete the element 6 from list `a`

a.remove(6)

delete a list element by value

delete the element `c` from list `a`

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

delete a list element by value

delete the element `c` from list `a`

try: a.remove(c) except ValueError: pass

Python re.findall print all patterns

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')

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

outer 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 a list

Getting the last element of list `some_list`

some_list[(-1)]

Getting the last element of a list

Getting the second to last element of list `some_list`

some_list[(-2)]

gets the nth-to-last element

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

some_list[(- n)]

Getting the last element of a list

get the last element in list `alist`

alist[(-1)]

Getting the last element of a list

get the last element in list `astr`

astr[(-1)]

Create a list of integers with duplicate values in Python

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

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

Create a list of integers with duplicate values in Python

create 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]

Create a list of integers with duplicate values in Python

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

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

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

remove first and last lines of string `s`

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

Is there a Python dict without values?

create dict of squared int values in range of 100

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

How to zip lists in a list

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

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

How to zip lists in a list

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

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

python http request with token

request 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

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

x[2:]

substring a string

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

x[:2]

substring a string

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

x[:(-2)]

substring a string

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

x[(-2):]

substring a string

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

x[2:(-2)]

reversing a string

reverse a string `some_string`

some_string[::(-1)]

selecting alternate characters

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

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

substring a string

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

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

Terminating a Python script

terminate the program

sys.exit()

Terminating a Python script

terminate the program

quit()

Terminating a Python script

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

sys.exit('some error message')

Transform unicode string in python

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

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 CPU and RAM usage

get current RAM usage of current program

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

get current CPU and RAM usage

print cpu and memory usage

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

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

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

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

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

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

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

format strings and named arguments in Python

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

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

format strings and named arguments in Python

replace 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')

How to convert strings numbers to integers in a list?

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

changed_list = [(int(f) if f.isdigit() else f) for f in original_list]

Add items to a dictionary of lists

get a dictionary with keys from one list `keys` and values from other list `data`

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

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

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

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

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

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

df.to_csv('filename.csv', header=False)

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

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'))

Python list of dicts, get max value index

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

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

Format() in Python Regex

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')

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

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

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

Regex match even number of letters

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

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

Combining NumPy arrays

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

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