Some commonly used operators and built-in functions in python

1. Operator

Operator	Instance	Result	Description	Supported data types
	[1,2] [3,4]	[1 ,2,3,4]	Merge	Strings, lists, tuples
*	['A' ]*4	['A','A','A','A']	Copy	String, list, tuple
in	3 in (1,2,3)	True	Whether the element exists	String, list , tuple, dictionary (to determine whether the key exists)
not in	3 not in (1,2,3)	false	Whether the element does not exist	String, list, tuple, dictionary (to determine whether the key does not exist)

2. Built-in function

Function	Description
cmp(item1,item2)	Compare two values (When comparing dictionaries, compare keys first and then values)
len(item)	Calculate the number of container elements
max(item)	Returns the maximum value of the container
min(item)	Returns the minimum value of the container
del(item)	Delete variables

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