'and' 和 'or' 如何处理 Python 中的非布尔值? [英] How do 'and' and 'or' act with non-boolean values in Python?

问题描述

22 and 333/12 or 1

我遇到了上面的代码行.结果是 27，但我不太明白在这种情况下 and 和 or 是什么意思.有人可以向我解释，最好有例子.提前致谢！！

I have encountered the above line of code. The result is 27, but I could not quite understand what does and and or mean in this case. Can somebody explain to me, preferred with examples. Thanks in advance!!

推荐答案

这是和-或技巧" -- and 和 or 实际上并不返回布尔值；相反，它们返回其输入参数之一.人们过去常常将其用于控制​​流.

This is the "and-or trick" -- and and or don't actually return boolean values; instead, they return one of their input arguments. People used to use this for control-flow.

从 python 2.5 开始，不再需要，因为引入了条件表达式.

As of python 2.5, it's not necessary anymore, because conditional expressions were introduced.

22 and 333/12 or 1

相当于

333/12 if 22 else 1

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