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Detailed introduction to Python’s built-in all function

高洛峰Original: 2017-03-21 11:42:141816browse

English documentation:

all(iterable)

Return True if all elements of the iterable are 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 "<pyshell#9>", line 1, in <module>
    all(2)
TypeError: &#39;int&#39; 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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