Python Naming Convention

Type	Option	Default regular expression
Argument	argument-rgx	[a-z_][a-z0-9_]{2,30}$
Attribute	attr-rgx	[a-z_][a-z0-9_]{2,30}$
Class	class-rgx	[A-Z_][a-zA-Z0-9]+$
Constant	const-rgx	(([A-Z_][A-Z0-9_]*)|(__.*__))$
Function	function-rgx	[a-z_][a-z0-9_]{2,30}$
Method	method-rgx	[a-z_][a-z0-9_]{2,30}$
Module	module-rgx	(([a-z_][a-z0-9_]*)|([A-Z][a-zA-Z0-9]+))$
Variable	variable-rgx	[a-z_][a-z0-9_]{2,30}$
Variable, inline1	inlinevar-rgx	[A-Za-z_][A-Za-z0-9_]*$

1. Used as part of list comprehensions and generators.

Python Basic

Python Basic

List

>>> L = range(10)

>>> L

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

>>> L[::2]       ##odd idx selection

[0, 2, 4, 6, 8]

>>> L[1::2]     ##even idx selection

[1, 3, 5, 7, 9]

>>> 4 in L     ##memership test
True
>>>

Tuple

>>> t = (1,2,3)

>>> len(t)

3

>>> t[0:2]

(1, 2)

>>> t[::2]

(1, 3)

>>> t+t+t

(1, 2, 3, 1, 2, 3, 1, 2, 3)

>>> t*3

(1, 2, 3, 1, 2, 3, 1, 2, 3)

>>> 3 in t

True

difference between List and tuple

 - Each element of List can be changed, while tuple can't.