Joshua Cannon <joshdcan...@gmail.com> added the comment:

I created issue35498 about .parents rejecting slices as well. (It was pointed 
out this discussion would probably decide that issue's fate)
I think that .parents looking like a duck, but not quacking like one isn't very 
pythonic.

Besides, the fact that p.parents[len(p.parents)-2] is allowed but p.parents[-2] 
is not just seems like extra steps. There's also list(p.parents)[-2], which is 
still not ideal. In either case, I'd imagine authors to put a comment like 
"PathLib .parents doesn't support negative indexes", which goes to show clients 
are expecting negative indices to work.

I see that this issue is several years old. I'm happy to shepherd it if it 
needs further contributions.

----------
nosy: +thejcannon

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