[issue35712] Make NotImplemented unusable in boolean context

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

> list(filter(None.__ne__, L))

I assume you've been recommending this? To me it looks obfuscated. People should just use a comprehension, e.g.

[x for x in L if x is not None]

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35712>
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