Python 判断两个或多个条件not in和in

如果判断两个条件的话，尽量不要用not in，不晓得and两个条件的作用机制是什么样的。

改用’xxx’ not in a.lower()，能实现正常逻辑。

>>> a=‘addfxxxf'

>>> b=‘adafXXXj'

>>> ('xxx' and 'XXX') not in a

True

>>> ('xxx' and 'XXX') not in b

False

>>> ('xxx' and 'XXX') in b

True

>>> ('xxx' and 'XXX') in a

False

>>> 'xxx' not in a.lower()

False

>>> 'xxx' not in b.lower()

False

>>> 'xxx' in b.lower()

True

>>> 'xxx' in a.lower()

True