[issue17559] str.is* implementation seem suboptimal for single character strings

[Ezio Melotti]

Changes by Ezio Melotti <ezio.melotti at gmail.com>:


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nosy: +benjamin.peterson, ezio.melotti, haypo, serhiy.storchaka
versions: +Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17559>
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