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Get a list of pairs of key-value sorted by values in dictionary `data`

sort dict by value python

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

sort dict by value python

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

display current time

How do I display current time using Python + Django?

now = datetime.datetime.now().strftime('%H:%M:%S')

find the index of the second occurrence of the substring `bar` in string `foo bar bar bar`

Find the nth occurrence of substring in a string

"""foo bar bar bar""".replace('bar', 'XXX', 1).find('bar')

check if key 'stackoverflow' and key 'google' are presented in dictionary `sites`

How do you check the presence of many keys in a Python dictinary?

set(['stackoverflow', 'google']).issubset(sites)

replace string ' and ' in string `stuff` with character '/'

Replace part of a string in Python?

stuff.replace(' and ', '/')

Save array at index 0, index 1 and index 8 of array `np` to tmp file `tmp`

How to use `numpy.savez` in a loop for save more than one array?

np.savez(tmp, *[getarray[0], getarray[1], getarray[8]])

substract 1 hour and 10 minutes from current time

time offset

t = datetime.datetime.now() (t - datetime.timedelta(hours=1, minutes=10))

subtract 1 hour and 10 minutes from time object `t`

time offset

(t - datetime.timedelta(hours=1, minutes=10))

add 1 hour and 2 minutes to time object `t`

time offset

dt = datetime.datetime.combine(datetime.date.today(), t)

subtract 5 hours from the time object `dt`

time offset

dt -= datetime.timedelta(hours=5)

encode string `data` using hex 'hex' encoding

Manipulating binary data in Python

print(data.encode('hex'))

Return the decimal value for each hex character in data `data`

Manipulating binary data in Python

print(' '.join([str(ord(a)) for a in data]))

Get all the items from a list of tuple 'l' where second item in tuple is '1'.

python - iterating over a subset of a list of tuples

[x for x in l if x[1] == 1]

Create array `a` containing integers from stdin

How to read stdin to a 2d python array of integers?

a.fromlist([int(val) for val in stdin.read().split()])

place '\' infront of each non-letter char in string `line`

Is there a way to refer to the entire matched expression in re.sub without the use of a group?

print(re.sub('[_%^$]', '\\\\\\g<0>', line))

Get all `a` tags where the text starts with value `some text` using regex

How to use regular expression in lxml xpath?

doc.xpath("//a[starts-with(text(),'some text')]")

convert a list of lists `a` into list of tuples of appropriate elements form nested lists

Compare elements of a list of lists and return a list

zip(*a)

convert a list of strings `lst` to list of integers

Convert list of strings to int

[map(int, sublist) for sublist in lst]

convert strings in list-of-lists `lst` to ints

Convert list of strings to int

[[int(x) for x in sublist] for sublist in lst]

get index of elements in array `A` that occur in another array `B`

Numpy: find index of elements in one array that occur in another array

np.where(np.in1d(A, B))[0]

create a list where each element is a dictionary with keys 'key1' and 'key2' and values corresponding to each value in the lists referenced by keys 'key1' and 'key2' in dictionary `d`

Split dictionary of lists into list of dictionaries

[{'key1': a, 'key2': b} for a, b in zip(d['key1'], d['key2'])]

Split dictionary of lists into list of dictionaries

map(dict, zip(*[[(k, v) for v in value] for k, value in list(d.items())]))

Get Last Day of the first month in 2002

Get Last Day of the Month

calendar.monthrange(2002, 1)

Get Last Day of the second month in 2002

Get Last Day of the Month

calendar.monthrange(2008, 2)

Get Last Day of the second month in 2100

Get Last Day of the Month

calendar.monthrange(2100, 2)

Get Last Day of the month `month` in year `year`

Get Last Day of the Month

calendar.monthrange(year, month)[1]

Get Last Day of the second month in year 2012

Get Last Day of the Month

monthrange(2012, 2)

Get Last Day of the first month in year 2000

Get Last Day of the Month

(datetime.date(2000, 2, 1) - datetime.timedelta(days=1))

Calling an external command "ls -l"

Calling an external command

from subprocess import call

Calling an external command "some_command with args"

Calling an external command

os.system('some_command with args')

Calling an external command "some_command < input_file | another_command > output_file"

Calling an external command

os.system('some_command < input_file | another_command > output_file')

Calling an external command "some_command with args"

Calling an external command

stream = os.popen('some_command with args')

Calling an external command "echo Hello World"

Calling an external command

print(subprocess.Popen('echo Hello World', shell=True, stdout=subprocess.PIPE).stdout.read())

Calling an external command "echo Hello World"

Calling an external command

print(os.popen('echo Hello World').read())

Calling an external command "echo Hello World"

Calling an external command

return_code = subprocess.call('echo Hello World', shell=True)

Calling an external command "ls"

Calling an external command

p = subprocess.Popen('ls', shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT) for line in p.stdout.readlines(): print(line, end=' ') retval = p.wait()

Calling an external command "ls -l"

Calling an external command

call(['ls', '-l'])

decode url `url` with utf8 and print it

Url decode UTF-8 in Python

print(urllib.parse.unquote(url).decode('utf8'))

decode a urllib escaped url string `url` with `utf8`

Url decode UTF-8 in Python

url = urllib.parse.unquote(url).decode('utf8')

delete letters from string '12454v'

Delete letters from string

"""""".join(filter(str.isdigit, '12454v'))

Update row values for a column `Season` using vectorized string operation in pandas

applying regex to a pandas dataframe

df['Season'].str.split('-').str[0].astype(int)

sort a list of tuples `my_list` by second parameter in the tuple

Sort tuples based on second parameter

my_list.sort(key=lambda x: x[1])

find indexes of all occurrences of a substring `tt` in a string `ttt`

Find all occurrences of a substring in Python

[m.start() for m in re.finditer('(?=tt)', 'ttt')]

find all occurrences of a substring in a string

Find all occurrences of a substring in Python

[m.start() for m in re.finditer('test', 'test test test test')]

split string `s` based on white spaces

re.split with spaces in python

re.findall('\\s+|\\S+', s)

set columns `['race_date', 'track_code', 'race_number']` as indexes in dataframe `rdata`

Working with set_index in Pandas DataFrame

rdata.set_index(['race_date', 'track_code', 'race_number'])

recursively go through all subdirectories and files in `rootdir`

recursively go through all subdirectories and read files

for (root, subFolders, files) in os.walk(rootdir): pass

sort a list of dictionary values by 'date' in reverse order

sorting a list of dictionary values by date in python

list.sort(key=lambda item: item['date'], reverse=True)

display first 5 characters of string 'aaabbbccc'

How to truncate a string using str.format in Python?

"""{:.5}""".format('aaabbbccc')

unpack hexadecimal string `s` to a list of integer values

How do I convert a string of hexadecimal values to a list of integers?

struct.unpack('11B', s)

finding the index of an item 'foo' given a list `['foo', 'bar', 'baz']` containing it

Finding the index of an item given a list containing it in Python

[i for i, j in enumerate(['foo', 'bar', 'baz']) if j == 'foo']

generate all permutations of list `[1, 2, 3]` and list `[4, 5, 6]`

How to generate all permutations of a list in Python

print(list(itertools.product([1, 2, 3], [4, 5, 6])))

generate all permutations of a list `[1, 2, 3]`

How to generate all permutations of a list in Python

itertools.permutations([1, 2, 3])

substitute occurrences of unicode regex pattern u'\\p{P}+' with empty string '' in string `text`

Remove punctuation from Unicode formatted strings

return re.sub('\\p{P}+', '', text)

manually throw/raise a `ValueError` exception with the message 'A very specific bad thing happened'

manually throw/raise an exception

raise ValueError('A very specific bad thing happened')

throw an exception "I know Python!"

Manually raising (throwing) an exception

raise Exception('I know Python!')

Manually throw an exception "I know python!"

Manually raising (throwing) an exception

raise Exception('I know python!')

throw a ValueError with message 'represents a hidden bug, do not catch this'

Manually raising (throwing) an exception

raise ValueError('represents a hidden bug, do not catch this')

throw an Exception with message 'This is the exception you expect to handle'

Manually raising (throwing) an exception

raise Exception('This is the exception you expect to handle')

throw a value error with message 'A very specific bad thing happened', 'foo', 'bar', 'baz'

Manually raising (throwing) an exception

raise ValueError('A very specific bad thing happened')

throw a runtime error with message 'specific message'

Manually raising (throwing) an exception

raise RuntimeError('specific message')

throw an assertion error with message "Unexpected value of 'distance'!", distance

Manually raising (throwing) an exception

raise AssertionError("Unexpected value of 'distance'!", distance)

if Selenium textarea element `foo` is not empty, clear the field

Clear text from textarea with selenium

driver.find_element_by_id('foo').clear()

clear text from textarea 'foo' with selenium

Clear text from textarea with selenium

driver.find_element_by_id('foo').clear()

convert a number 2130706433 to ip string

Convert an IP string to a number and vice versa

socket.inet_ntoa(struct.pack('!L', 2130706433))

Rearrange the columns 'a','b','x','y' of pandas DataFrame `df` in mentioned sequence 'x' ,'y','a' ,'b'

How to rearrange Pandas column sequence?

df = df[['x', 'y', 'a', 'b']]

call base class's __init__ method from the child class `ChildClass`

How to call Base Class's __init__ method from the child class?

super(ChildClass, self).__init__(*args, **kwargs)

sum of all values in a python dict `d`

Sum of all values in a Python dict

sum(d.values())

Sum of all values in a Python dict

sum(d.values())

convert python dictionary `your_data` to json array

Convert Python dictionary to JSON array

json.dumps(your_data, ensure_ascii=False)

assign an array of floats in range from 0 to 100 to a variable `values`

numpy array assignment using slicing

values = np.array([i for i in range(100)], dtype=np.float64)

sort a list of dictionaries `list_of_dct` by values in an order `order`

Sort a list of dictionary provided an order

sorted(list_of_dct, key=lambda x: order.index(list(x.values())[0]))

change the case of the first letter in string `s`

how to change the case of first letter of a string?

return s[0].upper() + s[1:]

join list of numbers `[1,2,3,4] ` to string of numbers.

how to change [1,2,3,4] to '1234' using python

"""""".join([1, 2, 3, 4])

delete every non `utf-8` characters from a string `line`

Delete every non utf-8 symbols froms string

line = line.decode('utf-8', 'ignore').encode('utf-8')

execute a command `command ` in the terminal from a python script

How to execute a command in the terminal from a Python script?

os.system(command)

MySQL execute query 'SELECT * FROM foo WHERE bar = %s AND baz = %s' with parameters `param1` and `param2`

Python MySQL Parameterized Queries

c.execute('SELECT * FROM foo WHERE bar = %s AND baz = %s', (param1, param2))

Parse string `datestr` into a datetime object using format pattern '%Y-%m-%d'

Convert a string to datetime object in python

dateobj = datetime.datetime.strptime(datestr, '%Y-%m-%d').date()