[issue39939] Add str methods to remove prefixes or suffixes

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

The PEP is a good start. Can you try to convert it to a PR on https://github.com/python/peps/ ? It seems like the next available PEP number is 616. I would prefer to leave comments on a PR.

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<https://bugs.python.org/issue39939>
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