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Added support for negative indexes to PurePath.parents (GH-21799)

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This commit also fixes up some of the overlapping documentation changed
in bpo-35498, which added support for indexing with slices.

Fixes bpo-21041.
https://bugs.python.org/issue21041

Co-authored-by: Paul Ganssle <p.ganssle@gmail.com>
Co-authored-by: Rémi Lapeyre <remi.lapeyre@henki.fr>
This commit is contained in:
Yaroslav Pankovych 2020-11-23 22:06:22 +02:00 • committed by GitHub
parent ffae93248a
commit 79d2e62c00
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7 changed files with 15 additions and 5 deletions
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Lib/pathlib.py
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@ -632,7 +632,8 @@ class _PathParents(Sequence):
def __getitem__(self, idx):
if isinstance(idx, slice):
return tuple(self[i] for i in range(*idx.indices(len(self))))
if idx < 0 or idx >= len(self):
if idx >= len(self) or idx < -len(self):
raise IndexError(idx)
return self._pathcls._from_parsed_parts(self._drv, self._root,
self._parts[:-idx - 1])