Python built-in all function detailed description

English documents:

all(iterable)

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

def all (iterable): for    element in iterable:        if not element:            return False    return True

Description

1. Accept an iterator object as a parameter when the argument is empty or not an iterator object is an error

>>> All (2) #传入数值报错Traceback (recent):  File ' <pyshell#9> ', line 1, in <module>
  
   all (2) TypeError: ' int ' object is not iterable
  

2. Returns true if the logical value of each element in an iterator object is true, otherwise false

>>> all ([truetrue>>>]) #列表中每个元素逻辑值均为True, return to all ([0,1,2]) #列表中0的逻辑值为False, return Falsefalse

3. Returns true if an iterator object is empty (number of elements is 0)

>>> All (()) #空元组True >>> all ({}) #空字典True