Is it possible for `__contains__` to return non-boolean value?

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Chapters
00:00 Is It Possible For `__contains__` To Return Non-Boolean Value?
00:36 Answer 1 Score 10
00:58 Answer 2 Score 6
01:21 Answer 3 Score 5
02:04 Accepted Answer Score 5
02:56 Thank you

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Full question
https://stackoverflow.com/questions/5335...

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