[issue39939] Add str methods to remove prefixes or suffixes

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

Guido, do you support this API expansion?

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nosy: +gvanrossum, rhettinger

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