[issue44571] itertools: takedowhile()

[pavel-lexyr]

New submission from pavel-lexyr <pavel at lexyr.com>:

As described in the documentation, itertools.takewhile() returns all the elements until the first one that does not match the provided criterion. In case of a destructive iterator, or one with side effects, not yielding an element downstream may render takewhile() unsuitable for use.

Proposed is itertools.takedowhile() - an alternate function that yields the first false element as well, and returns after. The behaviour is identical otherwise.

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messages: 397025
nosy: pavel-lexyr, rhettinger
priority: normal
severity: normal
status: open
title: itertools: takedowhile()
type: enhancement

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44571>
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