Python's built-in functions

Name of function	Function description	Example
ABS ()	Returns the absolute value of a number	ABS (-45)
Divmod ()	Combine the divisor and remainder operations to return a tuple containing quotient and remainder	Divmod (7,2) return: (3,1)
Raw_input ()	Get console input, treat all inputs as strings, return string types	A=raw_input ("input=") Input=abc Type (a) #<type ' str ' >
Input ()	Get console input, want to be able to read a valid Python expression, that is, the input string, you need to enclose in quotation marks, otherwise report syntax error	A=raw_input ("input=") INPUT=ABC #会报错
Staticmethod ()	Declaring a method as a static method, a class can call a static method without instantiating it, or an instantiation can invoke	Class C (object): @staticmethod def f (): Print ("Staticmethod") C.F () #静态方法无需实例化 CObj = C () COBJ.F () #实例也可调用
All ()	Used to determine whether all elements in the given iteration parameter iterable are not 0, ', false, or iterable null, or False if True is returned	All ([' A ', ' B ']) #True All ([' A ', '] ') #Flase All ([0,1,2]) #False All ([]) #True All (()) #True
Int (x,base=10)	The user converts a string or number to reshape, and base identifies the binary	int () # defaults to 0 Int (3.6) # 3 Int (' A ', ') #18
Ord ()	Returns the decimal integer of the corresponding character	Ord (' a ') #97
UNICHR ()	Returns the Unicode character	Unicode ($) # u ' A '
STR ()	Returns the string format of an object	Dict={' A ', ' B ', ' C '} STR (dict) # "{' A ', ' B ', ' C '}"
Any ()	Used to determine whether the given iteration parameters iterable are all empty objects, and if all are empty, 0, False, return false, otherwise true	Any ([' A ', ' B ', ' C ']) # True Any ([' A ', ' ', ' C ']) #True Any ([0, ', False]) #False Any ([]) #False Any (()) #False
Eval ()	Used to execute a string expression and return the value of the expression	X=7 Eval (' 3*x ') # 21 Eval (' Pow (2,2) ') #4 Eval (' the ' + + ') #4
Isinstance ()	Used to determine whether an object is a known type, it is assumed that the subclass is a type of parent class, considering the inheritance relationship	a=2 Isinstance (A,int) #True Isinstance (A,STR) #False Isinstance (A, (str,int,list)) #True Class A:pass Class B (A):p Isinstance (B (), A) #True Type (B ()) = = A #Flase
Type ()	Used to determine the type of an object and does not consider the subclass to be a parent class type, regardless of the inheritance relationship	Type (1) # <type ' int ' >
POW ()	The Math module calculates the y-side of X, and if z exists, then the result is modeled, equivalent to the POW (x, y)%z, which generally returns the float type	Math.pow (100,2) #10000.0 Math.pow (100,-2) #0.0001
SUM ()	Sum, SUM (Iterable[,start]), start specifies the parameter to add, no default is 0	SUM ([0,,1,2]) #3 SUM ([2,3,4],1) #10元组计算总和后再加1
Basestring ()	This method is a superclass of STR and Unicode (parent class), is also an abstract class, cannot be called and instantiated, but can be used to determine whether an object is a str or an instance of Unicode, isinstance (obj, basestring) is equivalent to Isinstance ( obj, (str, Unicode))	Isinstance("Hello World", basestring)
ExecFile ()	Used to execute a file	ExecFile (' test.py ') is equivalent to With open (' test.py ', ' R ') as F:exec (F.read ())
Issubclass ()	Issubclass (Class,classinfo), determines whether the class is a subclass of ClassInfo, returns True, or returns false	Class A:pass Class B (A):p Issubclass (b,a) #返回True
Bin ()	Returns a binary representation of an integer int or long int	Bin (Ten) # ' 0b1010 ' Bin (#) # ' 0b10100 '
ITER ()	function to build iterators	lst=[1,2,3] For I in ITER (LST):p rint (i)
Tuple ()	The function converts the list to a tuple, and a tuple of the dictionary key is returned for the dictionary; The tuple returns the tuple itself; the elements of the tuple cannot be modified	Tuple ([1,2,3,4]) # (1,2,3,4) Tuple ({1:2,3:4}) # (1,3)
List ()	Convert a tuple to a list	List ((*, ' xyz ', ' abc ') # [123, ' XYZ ', ' abc ']
BOOL ()	Converts the given parameter to a Boolean type, and returns False if there are no arguments	BOOL () # False BOOL (0) # False BOOL (1) # True
Filter ()	The function is used to filter the sequence, filter out non-conforming elements, and return a new list of eligible elements, two parameters, the first is a function, the second is a sequence; filter (function,iterable)	Filter out all cardinality def is_odd (n): return n%2 = = 1 NewList = Filter (is_odd,[1,2,3,4,5,6]) #newlist = [1,3,5]
Len ()	Returns the length of a string or the number of items	str = "Runnoob" Len (str) #6 L = [1,2,3,4,5] Len (l) # 5
Range ()	Can create a list of integers, typically used in a For loop, range (Start,stop[,step])	Range (5) # [0,1,2,3,4,5] Range (1,5) # [1,2,3,4,5] Range (0,6,2) # [0,2,4,6]
Float ()	convert integers and strings to floating-point numbers	Float (1) # 1.0 Float (112) # 112.0 Float (' 123 ') # 123.0
Callable (object)	Used to check if an object is callable, returning true,object may still fail to invoke, and calling object will never succeed if it returns false	Callable (0) # False Callable ("Baidu") # False def add (A, B): Return a+b Callable (ADD) # True
Format ()	function Str.format () for formatting strings, which enhances the function of string formatting 1.format function can accept unlimited number of parameters, position can also be out of order 2. Parameters can also be set	1. Position not in order "{} {}". Format ("H", "W") # "H W" ' {0}{1} '. Format ("H", "W") # "H W" ' {1}{0}{0} '. Format ("H", "W") # "W H H" 2. Setting parameters "Site name: {name}, Address: {URL}". Format (name= "Baidu", Url= "www.baidu.com") Setting parameters through a dictionary site = {"Name": "Baidu", "url": "Www.baidu.com"} "Site name: {name}, address {URL}". Format (**site) Setting parameters by List index My_list = [' Baidu ', ' www.baidu.com '] "Site name: {0[0]}, address {0[1]}". Format (my_list) #0是必须的
Locals ()	Returns all local variables of the current position as a dictionary type For functions, methods, lambda functions, classes, and class instances that implement the __call__ method, it returns true	def Baidu (Arg): Z=1 Print (Locals ()) Baidu (4) #{' Z ': 1, ' arg ': 4} Returns a dictionary of name/value pairs
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Python's built-in functions