CODEWITHSUNDEEP
python
37dev
37dev

Reputation: 189

Why bool(None and None is None) is False?

If None and None returns None, (None and None is None) should return True, No?

Was debugging an app and noticed that it returns None

Upvotes: 0

Views: 52

Answers (1)

svfat
svfat

Reputation: 3363

Good question!

(None and None is None)

"is" has a priority, so None is None returns True

"and" executed after that, so None and True result in None

If you add parenthesis, you can make it work in another way: ((None and None) is None) returns True

You can find more info on that topic here: https://docs.python.org/3/reference/expressions.html#operator-precedence

Upvotes: 3

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