[issue47161] pathlib method relative_to doesnt work with // in paths

[Oleg Iarygin]

Oleg Iarygin <oleg at arhadthedev.net> added the comment:

> But shouldn't it just work with `//` as a `/`? It seems like this is the behavior elsewhere.

It works elsewhere because empty directory names are impossible so can be dropped. But if `//` is placed in the beginning, it gets a special meaning that totally changes the whole path so its plain replacement would give a totally wrong one.

Roughly speaking, "//Library/Video" is `/Video` on a computer named `Library`.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue47161>
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