[issue21041] pathlib.PurePath.parents rejects negative indexes

[akira]

akira added the comment:

>From https://docs.python.org/3/glossary.html#term-sequence

> An iterable which supports efficient element access using integer indices via the __getitem__() special method and defines a __len__() method that returns the length of the sequence.

.parents *is* a sequence. And it *is* confusing that it doesn't accept negative indexes -- that is how I've encountered the bug.

Antoine, could you elaborate on what are the negative consequences of negative indexes to justify breaking the expectations?

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