Python: Summary of Built-in functions

Preface: Python's built-in function provides a great convenience for programming, which is a relatively complete summary of the built-in functions of Python 3.x in order to facilitate later learning.

A ? ABS (x):if x is a complex number, the size of it is returnedIf an integer or floating-point number returns its absolute value

1 Print (ABS ( -1)) 2 Print (ABS ( -10.01)) 3 Print #返回复数的大小

? All (iterable):If all elements of iterable are not 0, ', false, or iterable are empty, all (iterable) returns True, otherwise false

Special attention:

(1) iterable is generally a list or tuple

1 Print (All ([1,2,-5,'agg'])) 2 Print (All ((0,', True)))

(2) Empty tuples and empty lists return true

1 Print (All ([])) # Empty list 2 Print (All (())) # Empty tuple

(3) All (iterable) is equivalent to:

1 def All (iterable): 2      for inch iterable: 3         if  not element: 4             return False 5     return True

? Any (iterable):If iterable all elements are 0, ', false, or iterable is empty, any (iterable) returns false, otherwise true

Special attention:

(1) iterable is generally a list or tuple

1 Print (Any ([0,1,2,3])) 2 Print (Any (0,', False)))

(2) empty list and empty tuple return false

1 Print (Any (())) # Empty tuple 2 Print (Any ([])) # Empty list

(3) any (iterable) is equivalent to:

1 def Any (iterable): 2      for inch iterable: 3         if element: 4             return True 5     return False

? ASCII (objiect):Returns the string form of object

Special attention:

If the Objiect object contains non-ASCII characters, the string using \x,\u or \u encoding is returned by REPR ()

1 number=12342 name='tomwenxing'3 location='  Hangzhou '4print(ASCII (number), type (number))5  Print(ASCII (name), type (ASCII (name)))6print(location), type (ASCII ( Location)))

B? bin (x):Returns an integer int or a long integerBinary Representation (the string)

1 Print (Bin (2), type (Bin (2))) 2 Print (Bin) 3 Print (Bin (20))

? bool ([x]):Used to convert a given parameter to a Boolean type, or False if there are no arguments

[Note]:bool is a subclass of int

1 Print (bool ()) 2 Print (BOOL (1)) 3 Print (BOOL ([1,2,3,4])) 4 Print (Issubclass (Bool,int)) # determine if BOOL is a subclass of int

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Python: Summary of Built-in functions