Python3 built-in functions--all and any

the first sacrifice English Documents:

all ( iterable Span class= "Sig-paren")

Return true If all elements of the iterable was true (or if the iterable is empty). Equivalent to:

 def all (iterable): for element in iterable : if not element: return false return true    

any ( iterable)

Return True If any element of the iterable is true. If the iterable is empty, return False . Equivalent to:

Any(iterable):    iterableelementFalse     

Again on the function information table

Function prototypes	All (iterable)
Parameter interpretation	Iterable	An object can be iterated, and the parameter cannot be empty, but the iterable can be empty.
return value	<class ' bool ' > True or False.
Function description	Returns True when all elements in the iterable are true (or iterable is empty).

Function prototypes	Any (iterable)
Parameter interpretation	Iterable	An object can be iterated, and the parameter cannot be empty, but the iterable can be empty.
return value	<class ' bool ' > True or False.
Function description	Returns True when an element in the iterable is true. Returns False if Iterable is empty.

From the official documentation, we know that all (iterable) is equivalent to the following code:

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

Any (iterable) is equivalent to this code:

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

That is, when given a non-nullable iterator object :

For The all function, returns trueif the element is all true, otherwise false . That is, as long as the existence of false elements to return false .

For The Any function, returns truewhenever there is an element that is true . The element that does not exist for true returns false.

Also, when an iterator object is empty , the all function returns True, and the Any function returns False. This is because the iterable is empty when the traversal is not executed and jumps directly to line 5 to execute the return.

Example 1:all function Various parameters of various results

1>>> All (['a', (2,4), 1,true])#list is true2 True3>>> All (['a', (), 1,true])#empty tuple in list element4 False5>>> All (['a', (2,4), 0,true])#There are 06 False7>>> All (['a', (2,4), 3,false])#have false8False

Example 2:any function Various parameters of various results

1>>> any (['a', (2,4), 3, True]) 2 True3>>> any (['a', (2,4), 3, False])4 True5>>> any (['a', (), 3, False]) 6 True7>>> any (["', (), 0,false]) 8 False9>>> any ('a', (), 3, False))Ten True One>>> any ("', (), 0,false))  AFalse

Example 3:all function parameter is empty and iterable is empty

1>>>All ()2 Traceback (most recent):3File"<pyshell#20>", Line 1,inch<module>4 All ()5 Typeerror:all () takes exactly one argument (0 given)6>>>All ([])7 True8>>>All (())9 TrueTen>>>All ({}) One True A>>> All ("')#null list, truple, Dict, str are true - True

Example 4:any function parameter is empty and iterable is empty

1>>>Any ()2 Traceback (most recent):3File"<pyshell#37>", Line 1,inch<module>4 Any ()5 Typeerror:any () takes exactly one argument (0 given)6>>>Any ([])7 False8>>>Any (())9 FalseTen>>>Any ({}) One False A>>> any ("") -False

Example 5:iterable does not traverse when empty

1 >>> p=12 >>> i=[]3 for in I:            #  i is empty do not traverse 4     print  (p)567 >>>

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Python3 built-in functions--all and any