[issue18373] implement sys.get/setbyteswarningflag()

[STINNER Victor]

STINNER Victor added the comment:

> Python 3 is supposed to make it easier to do Unicode correctly. str(bytes) does not.

str(bytes) does not make sense, that's why an exception is raised when
the -bb command line option is used ;-)

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