Any和All是python中提供的两个内置函数,用于连续和/或。
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任何 如果任何项为true,则返回true。如果为空或全部为False,则返回False。任何操作都可以被认为是对所提供的iterables的一系列操作。 它会使执行短路,即在知道结果后立即停止执行。
语法: 任何(可编辑列表)
# Since all are false, false is returned print ( any ([ False , False , False , False ])) # Here the method will short-circuit at the # second item (True) and will return True. print ( any ([ False , True , False , False ])) # Here the method will short-circuit at the # first (True) and will return True. print ( any ([ True , False , False , False ])) |
输出:
False True True
全部的 如果所有项都为true(或者如果iterable为空),则返回true。所有这些都可以被认为是对所提供的可重用项的一系列操作。它还会使执行短路,即在知道结果后立即停止执行。
语法: 全部(可编辑列表)
# Here all the iterables are True so all # will return True and the same will be printed print ( all ([ True , True , True , True ])) # Here the method will short-circuit at the # first item (False) and will return False. print ( all ([ False , True , True , False ])) # This statement will return False, as no # True is found in the iterables print ( all ([ False , False , False ])) |
输出:
True False False
实例
# This code explains how can we # use 'any' function on list list1 = [] list2 = [] # Index ranges from 1 to 10 to multiply for i in range ( 1 , 11 ): list1.append( 4 * i) # Index to access the list2 is from 0 to 9 for i in range ( 0 , 10 ): list2.append(list1[i] % 5 = = 0 ) print ( 'See whether at least one number is divisible by 5 in list 1=>' ) print ( any (list2)) |
输出:
See whether at least one number is divisible by 5 in list 1=> True
# Illustration of 'all' function in python 3 # Take two lists list1 = [] list2 = [] # All numbers in list1 are in form: 4*i-3 for i in range ( 1 , 21 ): list1.append( 4 * i - 3 ) # list2 stores info of odd numbers in list1 for i in range ( 0 , 20 ): list2.append(list1[i] % 2 = = 1 ) print ( 'See whether all numbers in list1 are odd =>' ) print ( all (list2)) |
输出:
See whether all numbers in list1 are odd => True
真值表:-
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