Python

Useful Python code, with no particular order

All asserts methods

More info https://www.mattcrampton.com/blog/a_list_of_all_python_assert_methods/

Method	Checks	Version
assertEqual	a == b
assertNotEqual	a != b
assertTrue	bool(x) is True
assertFalse	bool(x) is False
assertIs	a is b	2.7
assertIsNot	a is not b	2.7
assertIsNone	x is None	2.7
assertIsNotNone	x is not None	2.7
assertIn	a in b	2.7
assertNotIn	a not in b	2.7
assertIsInstance	is instance(a,b)	2.7
assertNotIsInstance	not is instance(a,b)	2.7
assertRaises	fun(args,kwds) raises exc \| \| \| assertRaisesRegexp \| fun(args,**kwds) raises exc(regex)	2.7
assertAlmostEqual	round(a-b,7) == 0
assertNotAlmostEqual	round(a-b,7) != 0
assertGreater	a > b	2.7
assertGreaterEqual	a >= b	2.7
assertLess	a < b	2.7
assertLessEqual	a ⇐ b	2.7
assertRegexpMatches	r.search(s)	2.7
assertNotRegexpMatches	not r.search(s)	2.7
assertItemsEqual	sorted(a) == sorted(b)	2.7
assertDictContainsSubset	all the key/value pairs in a exist in b	2.7
assertMultiLineEqual	strings	2.7
assertSequenceEqual	sequences	2.7
assertListEqual	lists	2.7
assertTupleEqual	tuples	2.7
assertSetEqual	sets or frozensets	2.7
assertDictEqual	dicts	2.7

Dates

strftime() and strptime() Format Codes

More info https://docs.python.org/3/library/datetime.html#strftime-and-strptime-format-codes

Directive	Meaning	Example	Notes
%a	Weekday as locale’s abbreviated name.	Sun, Mon, …, Sat (en_US);So, Mo, …, Sa (de_DE)	(1)
%A	Weekday as locale’s full name.	Sunday, Monday, …, Saturday (en_US);Sonntag, Montag, …, Samstag (de_DE)	(1)
%w	Weekday as a decimal number, where 0 is Sunday and 6 is Saturday.	0, 1, …, 6
%d	Day of the month as a zero-padded decimal number.	01, 02, …, 31	(9)
%b	Month as locale’s abbreviated name.	Jan, Feb, …, Dec (en_US);Jan, Feb, …, Dez (de_DE)	(1)
%B	Month as locale’s full name.	January, February, …, December (en_US);Januar, Februar, …, Dezember (de_DE)	(1)
%m	Month as a zero-padded decimal number.	01, 02, …, 12	(9)
%y	Year without century as a zero-padded decimal number.	00, 01, …, 99	(9)
%Y	Year with century as a decimal number.	0001, 0002, …, 2013, 2014, …, 9998, 9999	(2)
%H	Hour (24-hour clock) as a zero-padded decimal number.	00, 01, …, 23	(9)
%I	Hour (12-hour clock) as a zero-padded decimal number.	01, 02, …, 12	(9)
%p	Locale’s equivalent of either AM or PM.	AM, PM (en_US);am, pm (de_DE)	(1), (3)
%M	Minute as a zero-padded decimal number.	00, 01, …, 59	(9)
%S	Second as a zero-padded decimal number.	00, 01, …, 59	(4), (9)
%f	Microsecond as a decimal number, zero-padded on the left.	000000, 000001, …, 999999	(5)
%z	UTC offset in the form ±HHMM[SS[.ffffff]] (empty string if the object is naive).	(empty), +0000, -0400, +1030, +063415, -030712.345216	(6)
%Z	Time zone name (empty string if the object is naive).	(empty), UTC, GMT	(6)
%j	Day of the year as a zero-padded decimal number.	001, 002, …, 366	(9)
%U	Week number of the year (Sunday as the first day of the week) as a zero padded decimal number. All days in a new year preceding the first Sunday are considered to be in week 0.	00, 01, …, 53	(7), (9)
%W	Week number of the year (Monday as the first day of the week) as a decimal number. All days in a new year preceding the first Monday are considered to be in week 0.	00, 01, …, 53	(7), (9)
%c	Locale’s appropriate date and time representation.	Tue Aug 16 21:30:00 1988 (en_US);Di 16 Aug 21:30:00 1988 (de_DE)	(1)
%x	Locale’s appropriate date representation.	08/16/88 (None);08/16/1988 (en_US);16.08.1988 (de_DE)	(1)
%X	Locale’s appropriate time representation.	21:30:00 (en_US);21:30:00 (de_DE)	(1)
%%	A literal '%' character.	%

Convert strings to datetime

More info https://stackabuse.com/converting-strings-to-datetime-in-python/

import datetime
 
date_time_str = 'Jun 28 2018 7:40AM'
date_time_obj = datetime.datetime.strptime(date_time_str, '%b %d %Y %I:%M%p')
 
print('Date:', date_time_obj.date())
print('Time:', date_time_obj.time())
print('Date-time:', date_time_obj)

Inline

For loops

[print(day) for day in ['monday', 'tuesday', 'wednesday', 'thursday', 'friday']]
>>> monday
tuesday
wednesday
thursday
friday
[None, None, None, None, None]

If statements

today = 'friday'
print('yay!') if today == 'friday' else print('boo')
>>> yay!

Unpack extras on a tuple or list

t = (0, 1, 2, 3, 4)
 
a, b, *c = t
 
print(a)
print(b)
print(c)
# 0
# 1
# [2, 3, 4]
 
print(type(c))
# <class 'list'>
 
a, *b, c = t
 
print(a)
print(b)
print(c)
# 0
# [1, 2, 3]
# 4
 
*a, b, c = t
 
print(a)
print(b)
print(c)
# [0, 1, 2]
# 3
# 4

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Table of Contents

Python

All asserts methods

Dates

strftime() and strptime() Format Codes

Convert strings to datetime

Inline

For loops

If statements

Unpack extras on a tuple or list