[Python-ideas] Define __getitem__ for PurePath

[Riley Banks]

Greetings.

I think it'd be nice to have the ability to subscript/slice instances of
pathlib.PurePath and its subclasses e.g.

    path = Path()
    assert path[n:m:k] == type(path)(*path.parts[n:m:k])

Maybe it's worth adding some check with custom exception thrown in case of
invalid index/slice. What do you think? I'll open new issue and submit a
patch if you approve of this...
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