[issue35712] Make NotImplemented unusable in boolean context

[Vedran Čačić]

Vedran Čačić <vedgar at gmail.com> added the comment:

... as it probably should: look at https://bugs.python.org/msg349303

Yes, filtering comprehensions are a frequently used niche, and too long in the "official" parlance. I seem to recall that 

    [x in mylist if x is not None]

(instead of triple-x version) was rejected because it was too hard to parse. Maybe now we can really implement it?

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