[issue40753] Remove Python 2 compatibility code from pathlib

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

This code is valid in Python 3. We usually do not accept such pure cosmetic changes.

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue40753>
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