[issue39939] Add str methods to remove prefixes or suffixes

[Dennis Sweeney]

Change by Dennis Sweeney <sweeney.dennis650 at gmail.com>:


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keywords: +patch
pull_requests: +18292
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/18939

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39939>
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