python中的用户输入布尔值 [英] User input boolean in python

问题描述

我试图让用户输入他们是否喜欢辛辣食物，并且输出应该是布尔值，但是我的以下代码似乎没有输出:

I am trying to have a user input whether or not they like spicy food and the output is supposed to be a boolean but I don't seem to be getting an output with my code below:

def likes_spicyfood():
    spicyfood = bool(input("Do you like spicy food? True or False?"))
    if spicyfood == ("True"):
        print("True")
    if spicyfood == ("False"):
        print("False")
        return(likes_spicyfood)

推荐答案

尝试将您的输入转换为bool不会那样. Python认为任何非空字符串True .因此，执行bool(input())基本上与执行input() != ''相同.即使输入不是"True"，两者都返回true.只需将直接给定的输入与字符串"True和"False"进行比较:

Trying to convert your input to bool won't work like that. Python considers any non-empty string True. So doing bool(input()) is basically the same as doing input() != ''. Both return true even if the input wasn't "True". Just compare the input given directly to the strings "True and "False":

def likes_spicyfood():
    spicyfood = input("Do you like spicy food? True or False?")
    if spicyfood == "True":
        return True
    if spicyfood == "False":
        return False

请注意，如果输入不是"True或"False"，则上述代码将失败(通过返回None而不是布尔值).考虑返回默认值或重新询问用户输入，如果原始输入无效(即不是"True或"False").

Note that the above code will fail (by returning None instead of a boolean value) if the input is anything but "True or "False". Consider returning a default value or re-asking the user for input if the original input is invalid (i.e not "True or "False").

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