[issue21041] pathlib.PurePath.parents rejects negative indexes

[akira]

akira added the comment:

> Aren't negative indexes well defined in Python?  

yes. I've provided the link to Python docs [1] in msg214642 that 
explicitly defines the behavior:

> If i or j is negative, the index is relative to the end of the string: 
> len(s) + i or len(s) + j is substituted. But note that -0 is still 0.

[1]: https://docs.python.org/3/library/stdtypes.html#sequence-types-list-tuple-range

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