[issue8951] PyArg_Parse*(): factorize code of 's' and 'z' formats, and 'u' and 'Z' formats

[STINNER Victor]

Changes by STINNER Victor <victor.stinner at haypocalc.com>:


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dependencies: +PyArg_Parse*(): "z" should not accept bytes

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8951>
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