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empty a list `lst`

empty a list

lst[:] = []

empty a list `alist`

empty a list

alist[:] = []

reset index of series `s`

Pandas reset index on series to remove multiindex

s.reset_index(0).reset_index(drop=True)

convert unicode text from list `elems` with index 0 to normal text 'utf-8'

How to convert unicode text to normal text

elems[0].getText().encode('utf-8')

create a list containing the subtraction of each item in list `L` from the item prior to it

Subtracting the current and previous item in a list

[(y - x) for x, y in zip(L, L[1:])]

get value in string `line` matched by regex pattern '\\bLOG_ADDR\\s+(\\S+)'

Cleanest way to get a value from a list element

print(re.search('\\bLOG_ADDR\\s+(\\S+)', line).group(1))

import all classes from module `some.package`

Importing everything ( * ) dynamically from a module

globals().update(importlib.import_module('some.package').__dict__)

convert a list of characters `['a', 'b', 'c', 'd']` into a string

Convert a list of characters into a string

"""""".join(['a', 'b', 'c', 'd'])

Slice `url` with '&' as delimiter to get "http://www.domainname.com/page?CONTENT_ITEM_ID=1234" from url "http://www.domainname.com/page?CONTENT_ITEM_ID=1234&param2&param3 "

Slicing URL with Python

url.split('&')

sort dictionary `d` by key

sort a dictionary by key

od = collections.OrderedDict(sorted(d.items()))

sort a dictionary `d` by key

sort a dictionary by key

OrderedDict(sorted(list(d.items()), key=(lambda t: t[0])))

Execute a put request to the url `url`

PUT Request to REST API using Python

response = requests.put(url, data=json.dumps(data), headers=headers)

replace everything that is not an alphabet or a digit with '' in 's'.

Python remove anything that is not a letter or number

re.sub('[\\W_]+', '', s)

create a list of aggregation of each element from list `l2` to all elements of list `l1`

Python Nested List Comprehension with two Lists

[(x + y) for x in l2 for y in l1]

convert string `x' to dictionary splitted by `=` using list comprehension

convert string to dict using list comprehension in python

dict([x.split('=') for x in s.split()])

remove index 2 element from a list `my_list`

Remove object from a list of objects in python

my_list.pop(2)

Delete character "M" from a string `s` using python

How to delete a character from a string using python?

s = s.replace('M', '')

How to delete a character from a string using python?

newstr = oldstr.replace('M', '')

get the sum of the products of each pair of corresponding elements in lists `a` and `b`

How can I sum the product of two list items using for loop in python?

sum(x * y for x, y in zip(a, b))

sum the products of each two elements at the same index of list `a` and list `b`

How can I sum the product of two list items using for loop in python?

list(x * y for x, y in list(zip(a, b)))

sum the product of each two items at the same index of list `a` and list `b`

How can I sum the product of two list items using for loop in python?

sum(i * j for i, j in zip(a, b))

sum the product of elements of two lists named `a` and `b`

How can I sum the product of two list items using for loop in python?

sum(x * y for x, y in list(zip(a, b)))

write the content of file `xxx.mp4` to file `f`

Can I read and write file in one line with Python?

f.write(open('xxx.mp4', 'rb').read())

Add 1 to each integer value in list `my_list`

How to add an integer to each element in a list?

new_list = [(x + 1) for x in my_list]

get a list of all items in list `j` with values greater than `5`

Return list of items in list greater than some value

[x for x in j if x >= 5]

set color marker styles `--bo` in matplotlib

matplotlib: Set markers for individual points on a line

plt.plot(list(range(10)), '--bo')

set circle markers on plot for individual points defined in list `[1,2,3,4,5,6,7,8,9,10]` created by range(10)

matplotlib: Set markers for individual points on a line

plt.plot(list(range(10)), linestyle='--', marker='o', color='b')

split strings in list `l` on the first occurring tab `\t` and enter only the first resulting substring in a new list

split elements of a list in python

[i.split('\t', 1)[0] for i in l]

Split each string in list `myList` on the tab character

split elements of a list in python

myList = [i.split('\t')[0] for i in myList]

Sum numbers in a list 'your_list'

Summing elements in a list

sum(your_list)

attach debugger pdb to class `ForkedPdb`

How to attach debugger to a python subproccess?

ForkedPdb().set_trace()

Compose keys from dictionary `d1` with respective values in dictionary `d2`

Python: comprehension to compose two dictionaries

result = {k: d2.get(v) for k, v in list(d1.items())}

add one day and three hours to the present time from datetime.now()

datetime.datetime.now() + 1

datetime.datetime.now() + datetime.timedelta(days=1, hours=3)

Convert binary string to list of integers using Python

[int(s[i:i + 3], 2) for i in range(0, len(s), 3)]

switch keys and values in a dictionary `my_dict`

switching keys and values in a dictionary in python

dict((v, k) for k, v in my_dict.items())

sort a list `L` by number after second '.'

Specific sort a list of numbers separated by dots

print(sorted(L, key=lambda x: int(x.split('.')[2])))

Check if the value of the key "name" is "Test" in a list of dictionaries `label`

How to find a value in a list of python dictionaries?

any(d['name'] == 'Test' for d in label)

remove all instances of [1, 1] from list `a`

How can I remove all instances of an element from a list in Python?

a[:] = [x for x in a if x != [1, 1]]

remove all instances of `[1, 1]` from a list `a`

How can I remove all instances of an element from a list in Python?

[x for x in a if x != [1, 1]]

convert a list 'a' to a dictionary where each even element represents the key to the dictionary, and the following odd element is the value

Convert a list to a dictionary in Python

b = {a[i]: a[i + 1] for i in range(0, len(a), 2)}

check whether elements in list `a` appear only once

How to check whether elements appears in the list only once in python?

len(set(a)) == len(a)

Generate MD5 checksum of file in the path `full_path` in hashlib

Generating an MD5 checksum of a file

print(hashlib.md5(open(full_path, 'rb').read()).hexdigest())

How to sort a dictionary in python by value when the value is a list and I want to sort it by the first index of that list

sorted(list(data.items()), key=lambda x: x[1][0])

randomly switch letters' cases in string `s`

Pythons fastest way of randomising case of a string

"""""".join(x.upper() if random.randint(0, 1) else x for x in s)

force bash interpreter '/bin/bash' to be used instead of shell

How to force os.system() to use bash instead of shell

os.system('GREPDB="echo 123"; /bin/bash -c "$GREPDB"')

Run a command `echo hello world` in bash instead of shell

How to force os.system() to use bash instead of shell

os.system('/bin/bash -c "echo hello world"')

access the class variable `a_string` from a class object `test`

how to access the class variable by string in Python?

getattr(test, a_string)

Display a image file `pathToFile`

How to display a jpg file in Python?

Image.open('pathToFile').show()

replace single quote character in string "didn't" with empty string ''

Replace the single quote (') character from a string

"""didn't""".replace("'", '')

sort list `files` based on variable `file_number`

Sorting files in a list

files.sort(key=file_number)

remove all whitespace in a string `sentence`

remove all whitespace in a string

sentence.replace(' ', '')

remove all whitespace in a string `sentence`

remove all whitespace in a string

pattern = re.compile('\\s+') sentence = re.sub(pattern, '', sentence)

remove whitespace in string `sentence` from beginning and end

remove all whitespace in a string

sentence.strip()

remove all whitespaces in string `sentence`

remove all whitespace in a string

sentence = re.sub('\\s+', '', sentence, flags=re.UNICODE)

remove all whitespaces in a string `sentence`

remove all whitespace in a string

sentence = ''.join(sentence.split())

sum all the values in a counter variable `my_counter`

Sum all values of a counter in Python

sum(my_counter.values())

find the euclidean distance between two 3-d arrays `A` and `B`

Numpy: find the euclidean distance between two 3-D arrays

np.sqrt(((A - B) ** 2).sum(-1))

create list `levels` containing 3 empty dictionaries

Python: define multiple variables of same type?

levels = [{}, {}, {}]

find the sums of length 7 subsets of a list `daily`

Find the sum of subsets of a list in python

weekly = [sum(visitors[x:x + 7]) for x in range(0, len(daily), 7)]

Delete an element `key` from a dictionary `d`

Delete an element from a dictionary

del d[key]

Delete an element 0 from a dictionary `a`

Delete an element from a dictionary

{i: a[i] for i in a if (i != 0)}

Delete an element "hello" from a dictionary `lol`

Delete an element from a dictionary

lol.pop('hello')

Delete an element with key `key` dictionary `r`

Delete an element from a dictionary

del r[key]

solve for the least squares' solution of matrices `a` and `b`

Efficient computation of the least-squares algorithm in NumPy

np.linalg.solve(np.dot(a.T, a), np.dot(a.T, b))

split dictionary/list inside a pandas column 'b' into separate columns in dataframe `df`

Splitting dictionary/list inside a Pandas Column into Separate Columns

pd.concat([df.drop('b', axis=1), pd.DataFrame(df['b'].tolist())], axis=1)

loop through 0 to 10 with step 2

loop through a Python list by twos

for i in range(0, 10, 2): pass

loop through `mylist` with step 2

loop through a Python list by twos

for i in mylist[::2]: pass

lowercase string values with key 'content' in a list of dictionaries `messages`

How to use map to lowercase strings in a dictionary?

[{'content': x['content'].lower()} for x in messages]

convert a list `my_list` into string with values separated by spaces

convert list into string with spaces in python

""" """.join(my_list)

replace each occurrence of the pattern '(http://\\S+|\\S*[^\\w\\s]\\S*)' within `a` with ''

Regex. Match words that contain special characters or 'http://'

re.sub('(http://\\S+|\\S*[^\\w\\s]\\S*)', '', a)

check if string `str` is palindrome

How to check for palindrome using Python logic

str(n) == str(n)[::-1]

upload binary file `myfile.txt` with ftplib

How to upload binary file with ftplib in Python?

ftp.storbinary('STOR myfile.txt', open('myfile.txt', 'rb'))

remove all characters from string `stri` upto character 'I'

How to remove all characters before a specific character in Python?

re.sub('.*I', 'I', stri)

parse a comma-separated string number '1,000,000' into int

Python parse comma-separated number into int

int('1,000,000'.replace(',', ''))

combine dataframe `df1` and dataframe `df2` by index number

Combine two Pandas dataframes with the same index

pd.merge(df1, df2, left_index=True, right_index=True, how='outer')

Combine two Pandas dataframes with the same index

pandas.concat([df1, df2], axis=1)

check if all boolean values in a python dictionary `dict` are true

What's the best way to aggregate the boolean values of a Python dictionary?

all(dict.values())

use regex pattern '^12(?=.{4}$)' to remove digit 12 if followed by 4 other digits in column `c_contofficeID` of dataframe `df`

How to extract first two characters from string using regex

df.c_contofficeID.str.replace('^12(?=.{4}$)', '')

reverse a list `L`

reverse a list

L[::(-1)]

reverse a list `array`

reverse a list

reversed(array)

reverse a list `L`

reverse a list

L.reverse()

reverse a list `array`

reverse a list

list(reversed(array))

get first element of each tuple in list `A`

How to index nested lists in Python?

[tup[0] for tup in A]

replace character 'a' with character 'e' and character 's' with character '3' in file `contents`

Replacing characters in a file

newcontents = contents.replace('a', 'e').replace('s', '3')

serialise SqlAlchemy RowProxy object `row` to a json object

How to serialize SqlAlchemy result to JSON?

json.dumps([dict(list(row.items())) for row in rs])

get file '~/foo.ini'

Cross-platform addressing of the config file

config_file = os.path.expanduser('~/foo.ini')

get multiple parameters with same name from a url in pylons

How to get multiple parameters with same name from a URL in Pylons?

request.params.getall('c')

Convert array `x` into a correlation matrix

how to create similarity matrix in numpy python?

np.corrcoef(x)

Find the greatest number in set `(1, 2, 3)`

Python - Find the greatest number in a set of numbers

print(max(1, 2, 3))

Retrieve parameter 'var_name' from a GET request.

Google App Engine - Request class query_string

self.request.get('var_name')

Add 100 to each element of column "x" in dataframe `a`

python pandas: apply a function with arguments to a series. Update

a['x'].apply(lambda x, y: x + y, args=(100,))

Django get first 10 records of model `User` ordered by criteria 'age' of model 'pet'

Get models ordered by an attribute that belongs to its OneToOne model

User.objects.order_by('-pet__age')[:10]

delay for "5" seconds

make a time delay

time.sleep(5)

make a 60 seconds time delay

make a time delay

time.sleep(60)

make a 0.1 seconds time delay

make a time delay

sleep(0.1)

make a 60 seconds time delay

make a time delay

time.sleep(60)

make a 0.1 seconds time delay

make a time delay

time.sleep(0.1)

From a list of strings `my_list`, remove the values that contains numbers.

Remove strings from a list that contains numbers in python

[x for x in my_list if not any(c.isdigit() for c in x)]

get the middle two characters of a string 'state' in a pandas dataframe `df`

how to do a left,right and mid of a string in a pandas dataframe

df['state'].apply(lambda x: x[len(x) / 2 - 1:len(x) / 2 + 1])

draw a grid line on every tick of plot `plt`

How do I draw a grid onto a plot in Python?

plt.grid(True)