Barry A. Warsaw added the comment:
Aren't negative indexes well defined in Python? E.g.
>>> p = Path('/tmp/tmp123/foo/bar/baz.xz')
>>> p.parents[len(p.parents)-2]
PosixPath('/tmp')
p.parents[-2] should == p.parents[len(p.parents)-2]
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<http://bugs.python.org/issue21041>
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