[issue27185] Increase Test Coverage for the String Module

[Gregory P. Smith]

New submission from Gregory P. Smith:

Can you sign the Python contributor form  - https://www.python.org/psf/contrib/contrib-form/?  (If you already have, just say so.)

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nosy: +gregory.p.smith

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27185>
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