在 Python 中从字符串转换为布尔值?
问题描述
有谁知道如何在 Python 中将字符串转换为布尔值?我发现 这个链接.但这看起来不是正确的方法.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.
我之所以问这个是因为我从这里了解了 int("string").但是当尝试 bool("string") 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
解决方案
真的，您只需将字符串与您期望接受的表示 true 的字符串进行比较，因此您可以这样做:
Really, you just compare the string to whatever you expect to accept as representing true, so you can do this:
s == 'True'
或检查一大堆值:
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
空字符串评估为 False，但其他所有字符串评估为 True.所以这不应该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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