Daniel Holth added the comment:
Better to continue discussion here.
Attached is my second, simpler version of the feature. A context manager is
included:
with string.StrBytesRaises():
str(b'bytes')
# raises an exception
In a normal program, you might just set the flag to True, but in a library that
has no hope of setting the -bb flag you might use it during serialization
rather than checking isinstance() on all input.
----------
title: implement sys.get/setbyteswarningflag() -> let code force str(bytes) to
raise an exception
versions: +Python 3.6 -Python 3.5
Added file: http://bugs.python.org/file43029/strbytes.patch
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