Detailed introduction to Python's built-in all function

English documentation:

all(iterable)

ReturnTrueif all elements of theiterableare 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 iterable object as a parameter. When the parameter is empty or not an iterable object, an error will be reported

>>> all(2) #传入数值报错 Traceback (most recent call last): File "", line 1, in  all(2) TypeError: 'int' object is not iterable

2. If each of the iterable objects When the logical values of the elements are all True, return True, otherwise return False

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

3. If the iterable object is empty (the number of elements is 0), return True

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

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