[issue21041] pathlib.PurePath.parents rejects negative indexes

[Maxwell Ballenger]

Maxwell Ballenger <ballengerm at gmail.com> added the comment:

Use case: I want to see if a Path is a descendent of /tmp.

if filepath.parents[-2] == Path('tmp'):

turns into

if filepath.parents[len(filepath.parents)-2] == Path('tmp'):

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nosy: +maxballenger

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<https://bugs.python.org/issue21041>
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