和/或运算符返回值 [英] and / or operators return value

问题描述

我正在观看 2007年有关高级Python或了解Python的视频，并在说话者说18'27"有些人可能在Python中知道and和or返回两个值之一，而not总是返回布尔值."

据我所知，and和or也会返回布尔值.

解决方案

and和or运算符确实返回其操作数之一，而不是像True或False这样的纯布尔值:

>>> 0 or 42
42
>>> 0 and 42
0

not始终返回纯布尔值:

>>> not 0
True
>>> not 42
False

I was watching a 2007 video on Advanced Python or Understanding Python, and at 18'27" the speaker claims "As some may know in Python and and or return one of the two values, whereas not returns always a boolean." When has this been the case?

As far as I can tell, and and or return booleans, too.

解决方案

The and and or operators do return one of their operands, not a pure boolean value like True or False:

>>> 0 or 42
42
>>> 0 and 42
0

Whereas not always returns a pure boolean value:

>>> not 0
True
>>> not 42
False

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