在Python中从字符串转换为布尔值? [英] Converting from a string to boolean in Python?

问题描述

有人知道如何在Python中从字符串转换为布尔值吗?我发现此链接.但这似乎不是正确的方法. IE.使用内置功能等.

Does anyone know how to do convert from a string to a boolean in Python? I found this link. But it doesn't look like a proper way to do it. I.e. using built-in functionality, etc.

之所以这样问，是因为我从这里学到了int("string").但是当尝试bool("string")时，它总是返回True:

The reason I'm asking this is because I learned about int("string") from here. But when trying bool("string") it always returns True:

>>> bool("False")
True

推荐答案

确实，您只需将字符串与您希望接受的代表true的字符串进行比较，就可以做到这一点:

Really, you just compare the string to whatever you expect to accept as representing true, so you can do this:

s == 'True'

或者检查一堆值:

s.lower() in ['true', '1', 't', 'y', 'yes', 'yeah', 'yup', 'certainly', 'uh-huh']

使用以下内容时要小心:

Be cautious when using the following:

>>> bool("foo")
True
>>> bool("")
False

空字符串的计算结果为False，但其他所有内容的计算结果为True.因此，不应将其用于任何类型的解析目的.

Empty strings evaluate to False, but everything else evaluates to True. So this should not be used for any kind of parsing purposes.

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