Python是否会懒惰地评估条件? [英] Does Python evaluate if's conditions lazily?

问题描述

例如，如果我有以下声明:

For example, if I have the following statement:

if( foo1 or foo2)
    ...
    ...

如果foo1为true，Python会检查foo2的条件吗?

if foo1 is true, will python check the condition of foo2?

推荐答案

是的，Python懒惰地评估布尔条件.

Yes, Python evaluates boolean conditions lazily.

文档说，

表达式x和y首先计算x；如果x为假，则其值为 回来;否则，将评估y并得出结果值为 返回.

The expression x and y first evaluates x; if x is false, its value is returned; otherwise, y is evaluated and the resulting value is returned.

表达式x或y首先计算x；如果x为true，则其值为 回来;否则，将评估y并得出结果值为 返回.

The expression x or y first evaluates x; if x is true, its value is returned; otherwise, y is evaluated and the resulting value is returned.

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