[issue44571] itertools: takedowhile()

[pavel-lexyr]

pavel-lexyr <pavel at lexyr.com> added the comment:

I see. If the syntax allows for better ways to do it now, perhaps a move towards deprecation would be a better idea then? This would agree with the Zen.

Also, please elaborate more on the generator-based solutions you have in mind. The suggestion stems from a very real use case - and the lambda function we ended up using looks like a poor hack.

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