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Concatenate elements of a list 'x' of multiple integers to a single integer

How to convert a list of multiple integers into a single integer?

sum(d * 10 ** i for i, d in enumerate(x[::-1]))

convert a list of integers into a single integer

How to convert a list of multiple integers into a single integer?

r = int(''.join(map(str, x)))

convert a DateTime string back to a DateTime object of format '%Y-%m-%d %H:%M:%S.%f'

how to convert a datetime string back to datetime object?

datetime.strptime('2010-11-13 10:33:54.227806', '%Y-%m-%d %H:%M:%S.%f')

get the average of a list values for each key in dictionary `d`)

Averaging the values in a dictionary based on the key

[(i, sum(j) / len(j)) for i, j in list(d.items())]

zip two lists `[1, 2]` and `[3, 4]` into a list of two tuples containing elements at the same index in each list

zip lists in python

zip([1, 2], [3, 4])

prepend string 'hello' to all items in list 'a'

Prepend the same string to all items in a list

['hello{0}'.format(i) for i in a]

regex for repeating words in a string `s`

regex for repeating words in a string in Python

re.sub('(?<!\\S)((\\S+)(?:\\s+\\2))(?:\\s+\\2)+(?!\\S)', '\\1', s)

normalize a pandas dataframe `df` by row

Normalizing a pandas DataFrame by row

df.div(df.sum(axis=1), axis=0)

swap values in a tuple/list inside a list `mylist`

swap values in a tuple/list inside a list in python?

map(lambda t: (t[1], t[0]), mylist)

Swap values in a tuple/list in list `mylist`

swap values in a tuple/list inside a list in python?

[(t[1], t[0]) for t in mylist]

Find next sibling element in Python Selenium?

driver.find_element_by_xpath("//p[@id, 'one']/following-sibling::p")

find all occurrences of the pattern '\\[[^\\]]*\\]|\\([^\\)]*\\)|"[^"]*"|\\S+' within `strs`

Python splitting string by parentheses

re.findall('\\[[^\\]]*\\]|\\([^\\)]*\\)|"[^"]*"|\\S+', strs)

generate the combinations of 3 from a set `{1, 2, 3, 4}`

What's the most memory efficient way to generate the combinations of a set in python?

print(list(itertools.combinations({1, 2, 3, 4}, 3)))

add multiple columns `hour`, `weekday`, `weeknum` to pandas data frame `df` from lambda function `lambdafunc`

Add Multiple Columns to Pandas Dataframe from Function

df[['hour', 'weekday', 'weeknum']] = df.apply(lambdafunc, axis=1)

BeautifulSoup search string 'Elsie' inside tag 'a'

BeautifulSoup - search by text inside a tag

soup.find_all('a', string='Elsie')

Convert a datetime object `my_datetime` into readable format `%B %d, %Y`

How do I turn a python datetime into a string, with readable format date?

my_datetime.strftime('%B %d, %Y')

parse string `s` to int when string contains a number

Parse string to int when string contains a number + extra characters

int(''.join(c for c in s if c.isdigit()))

add dictionary `{'class': {'section': 5}}` to key 'Test' of dictionary `dic`

adding new key inside a new key and assigning value in python dictionary

dic['Test'].update({'class': {'section': 5}})

transforming the string `s` into dictionary

Transforming the string representation of a dictionary into a real dictionary

dict(map(int, x.split(':')) for x in s.split(','))

How to select element with Selenium Python xpath

driver.find_element_by_xpath("//div[@id='a']//a[@class='click']")

find rows matching `(0,1)` in a 2 dimensional numpy array `vals`

Find matching rows in 2 dimensional numpy array

np.where((vals == (0, 1)).all(axis=1))

How to delete a record in Django models?

SomeModel.objects.filter(id=id).delete()

build a dictionary containing the conversion of each list in list `[['two', 2], ['one', 1]]` to a key/value pair as its items

python convert list to dictionary

dict([['two', 2], ['one', 1]])

convert list `l` to dictionary having each two adjacent elements as key/value pair

python convert list to dictionary

dict(zip(l[::2], l[1::2]))

assign float 9.8 to variable `GRAVITY`

how to set global const variables in python

GRAVITY = 9.8

separate numbers from characters in string "30m1000n20m"

How to use regular expression to separate numbers and characters in strings like "30M1000N20M"

re.findall('(([0-9]+)([A-Z]))', '20M10000N80M')

separate numbers and characters in string '20M10000N80M'

How to use regular expression to separate numbers and characters in strings like "30M1000N20M"

re.findall('([0-9]+|[A-Z])', '20M10000N80M')

separate numbers and characters in string '20M10000N80M'

How to use regular expression to separate numbers and characters in strings like "30M1000N20M"

re.findall('([0-9]+)([A-Z])', '20M10000N80M')

Get a list of words from a string `Hello world, my name is...James the 2nd!` removing punctuation

Extracting words from a string, removing punctuation and returning a list with separated words in Python

re.compile('\\w+').findall('Hello world, my name is...James the 2nd!')

Convert string '03:55' into datetime.time object

Convert string into datetime.time object

datetime.datetime.strptime('03:55', '%H:%M').time()

request url 'https://www.reporo.com/' without verifying SSL certificates

Python Requests getting SSLerror

requests.get('https://www.reporo.com/', verify=False)

Extract values not equal to 0 from numpy array `a`

removing data from a numpy.array

a[a != 0]

map two lists `keys` and `values` into a dictionary

Map two lists into a dictionary in Python

new_dict = {k: v for k, v in zip(keys, values)}

map two lists `keys` and `values` into a dictionary

Map two lists into a dictionary in Python

dict((k, v) for k, v in zip(keys, values))

map two lists `keys` and `values` into a dictionary

Map two lists into a dictionary in Python

dict([(k, v) for k, v in zip(keys, values)])

find the string matches within parenthesis from a string `s` using regex

Get the string within brackets in Python

m = re.search('\\[(\\w+)\\]', s)

Enable the SO_REUSEADDR socket option in socket object `s` to fix the error `only one usage of each socket address is normally permitted`

Python server "Only one usage of each socket address is normally permitted"

s.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)

append the sum of each tuple pair in the grouped list `list1` and list `list2` elements to list `list3`

How do i add two lists' elements into one list?

list3 = [(a + b) for a, b in zip(list1, list2)]

converting hex string `s` to its integer representations

Python - Converting Hex to INT/CHAR

[ord(c) for c in s.decode('hex')]

sort list `student_tuples` by second element of each tuple in ascending and third element of each tuple in descending

How to sort in decreasing value first then increasing in second value

print(sorted(student_tuples, key=lambda t: (-t[2], t[0])))

get list of duplicated elements in range of 3

Repeating elements in list comprehension

[y for x in range(3) for y in [x, x]]

read the contents of the file 'file.txt' into `txt`

Doc, rtf and txt reader in python

txt = open('file.txt').read()

divide each element in list `myList` by integer `myInt`

How do you divide each element in a list by an int?

myList[:] = [(x / myInt) for x in myList]

python: dots in the name of variable in a format string

"""Name: {0[person.name]}""".format({'person.name': 'Joe'})

replace white spaces in dataframe `df` with '_'

How to replace the white space in a string in a pandas dataframe?

df.replace(' ', '_', regex=True)

convert date `my_date` to datetime

Python: most efficient way to convert date to datetime

datetime.datetime.combine(my_date, datetime.time.min)

convert tuple `tst` to string `tst2`

Tuple to string

tst2 = str(tst)

get modified time of file `file`

get file creation & modification date/times in

time.ctime(os.path.getmtime(file))

get creation time of file `file`

get file creation & modification date/times in

time.ctime(os.path.getctime(file))

get modification time of file `filename`

get file creation & modification date/times in

t = os.path.getmtime(filename)

get modification time of file `path`

get file creation & modification date/times in

os.path.getmtime(path)

get modified time of file `file`

get file creation & modification date/times in

print(('last modified: %s' % time.ctime(os.path.getmtime(file))))

get the creation time of file `file`

get file creation & modification date/times in

print(('created: %s' % time.ctime(os.path.getctime(file))))

get the creation time of file `path_to_file`

get file creation & modification date/times in

return os.path.getctime(path_to_file)

execute os command ''TASKKILL /F /IM firefox.exe''

How to Close a program using python?

os.system('TASKKILL /F /IM firefox.exe')

split string `string` on whitespaces using a generator

Is there a generator version of `string.split()` in Python?

return (x.group(0) for x in re.finditer("[A-Za-z']+", string))

Unpack each value in list `x` to its placeholder '%' in string '%.2f'

Using Python String Formatting with Lists

""", """.join(['%.2f'] * len(x))

match regex pattern '(\\d+(\\.\\d+)?)' with string '3434.35353'

How to use regex with optional characters in python?

print(re.match('(\\d+(\\.\\d+)?)', '3434.35353').group(1))

replace parentheses and all data within it with empty string '' in column 'name' of dataframe `df`

How to remove parentheses and all data within using Pandas/Python?

df['name'].str.replace('\\(.*\\)', '')

create a list `result` containing elements form list `list_a` if first element of list `list_a` is in list `list_b`

Python: filter list of list with another list

result = [x for x in list_a if x[0] in list_b]

generate all possible string permutations of each two elements in list `['hel', 'lo', 'bye']`

Generate all possible strings from a list of token

print([''.join(a) for a in combinations(['hel', 'lo', 'bye'], 2)])

get a list of items form nested list `li` where third element of each item contains string 'ar'

python how to search an item in a nested list

[x for x in li if 'ar' in x[2]]

Sort lists in the list `unsorted_list` by the element at index 3 of each list

Python - How to sort a list of lists by the fourth element in each list?

unsorted_list.sort(key=lambda x: x[3])

Log message 'test' on the root logger.

Python logging typeerror

logging.info('test')

Return a subplot axes positioned by the grid definition `1,1,1` using matpotlib

How to make several plots on a single page using matplotlib?

fig.add_subplot(1, 1, 1)

Sort dictionary `x` by value in ascending order

Sort a Python dictionary by value

sorted(list(x.items()), key=operator.itemgetter(1))

Sort dictionary `dict1` by value in ascending order

Sort a Python dictionary by value

sorted(dict1, key=dict1.get)

Sort dictionary `d` by value in descending order

Sort a Python dictionary by value

sorted(d, key=d.get, reverse=True)

Sort dictionary `d` by value in ascending order

Sort a Python dictionary by value

sorted(list(d.items()), key=(lambda x: x[1]))

elementwise product of 3d arrays `A` and `B`

Numpy elementwise product of 3d array

np.einsum('ijk,ikl->ijl', A, B)

Print a string `card` with string formatting

print variable and a string in python

print('I have: {0.price}'.format(card))

Write a comment `# Data for Class A\n` to a file object `f`

How can I add a comment to a YAML file in Python

f.write('# Data for Class A\n')

move the last item in list `a` to the beginning

How do I move the last item in a list to the front in python?

a = a[-1:] + a[:-1]

Parse DateTime object `datetimevariable` using format '%Y-%m-%d'

python - convert datetime to varchar/string

datetimevariable.strftime('%Y-%m-%d')

Normalize line ends in a string 'mixed'

What's the most pythonic way of normalizing lineends in a string?

mixed.replace('\r\n', '\n').replace('\r', '\n')

find the real user home directory using python

How to find the real user home directory using python?

os.path.expanduser('~user')

index a list `L` with another list `Idx`

In Python, how do I index a list with another list?

T = [L[i] for i in Idx]

get a list of words `words` of a file 'myfile'

Iterate through words of a file in Python

words = open('myfile').read().split()

Get a list of lists with summing the values of the second element from each list of lists `data`

Summing 2nd list items in a list of lists of lists

[[sum([x[1] for x in i])] for i in data]

summing the second item in a list of lists of lists

Summing 2nd list items in a list of lists of lists

[sum([x[1] for x in i]) for i in data]

sort objects in `Articles` in descending order of counts of `likes`

Django order by highest number of likes

Article.objects.annotate(like_count=Count('likes')).order_by('-like_count')

return a DateTime object with the current UTC date

How to convert datetime.date.today() to UTC time?

today = datetime.datetime.utcnow().date()

create a list containing the multiplication of each elements at the same index of list `lista` and list `listb`

How to perform element-wise multiplication of two lists in Python?

[(a * b) for a, b in zip(lista, listb)]

fetch smilies matching regex pattern '(?::|;|=)(?:-)?(?:\\)|\\(|D|P)' in string `s`

Capturing emoticons using regular expression in python

re.findall('(?::|;|=)(?:-)?(?:\\)|\\(|D|P)', s)

match the pattern '[:;][)(](?![)(])' to the string `str`

Capturing emoticons using regular expression in python

re.match('[:;][)(](?![)(])', str)

convert a list of objects `list_name` to json string `json_string`

List of objects to JSON with Python

json_string = json.dumps([ob.__dict__ for ob in list_name])

create a list `listofzeros` of `n` zeros

List of zeros in python

listofzeros = [0] * n

decode the string 'stringnamehere' to UTF-8

python: how to convert a string to utf-8

stringnamehere.decode('utf-8', 'ignore')

Match regex pattern '((?:A|B|C)D)' on string 'BDE'

Python regex - Ignore parenthesis as indexing?

re.findall('((?:A|B|C)D)', 'BDE')

Create a key `key` if it does not exist in dict `dic` and append element `value` to value.

Python dict how to create key or append an element to key?

dic.setdefault(key, []).append(value)

Get the value of the minimum element in the second column of array `a`

Finding the minimum value in a numpy array and the corresponding values for the rest of that array's row

a[np.argmin(a[:, (1)])]

extend dictionary `a` with key/value pairs of dictionary `b`

Python "extend" for a dictionary

a.update(b)

removing key values pairs with key 'mykey1' from a list of dictionaries `mylist`

Removing key values pairs from a list of dictionaries

[{k: v for k, v in d.items() if k != 'mykey1'} for d in mylist]

Removing key values pairs from a list of dictionaries

[dict((k, v) for k, v in d.items() if k != 'mykey1') for d in mylist]

create 3 by 3 matrix of random numbers

Simple way to create matrix of random numbers

numpy.random.random((3, 3))

make new column 'C' in panda dataframe by adding values from other columns 'A' and 'B'

Make new column in Panda dataframe by adding values from other columns

df['C'] = df['A'] + df['B']

create a list of values from the dictionary `programs` that have a key with a case insensitive match to 'new york'

Find dictionary items whose key matches a substring

[value for key, value in list(programs.items()) if 'new york' in key.lower()]

append a path `/path/to/main_folder` in system path

Import module in another directory from a "parallel" sub-directory

sys.path.append('/path/to/main_folder')

get all digits in a string `s` after a '[' character

Regex for getting all digits in a string after a character

re.findall('\\d+(?=[^[]+$)', s)

python pickle/unpickle a list to/from a file 'afile'

Python pickle/unpickle a list to/from a file

pickle.load(open('afile', 'rb'))