[issue18373] implement sys.get/setbyteswarningflag()

[STINNER Victor]

STINNER Victor added the comment:

When I added os.environb, I had issues with the ByteWarning, in os.get_exec_path() if I remember correctly. I had to play with warmings.catch_warning(). A thread variable would simplify the code.

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nosy: +haypo

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18373>
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