[issue11681] -b option undocumented

[Emily Zhao]

Emily Zhao added the comment:

Might be worth making this addition from 3 (I'm not sure how to add this to 2)
-b     : issue warnings about str(bytes_instance), str(bytearray_instance)
         and comparing bytes/bytearray with str. (-bb: issue errors)


Building on Martin's example:

On all of these, python2 is
Python 2.7.6 (default, Apr  6 2014, 23:14:26)
[GCC 4.2.1 Compatible Apple LLVM 5.1 (clang-503.0.38)] on darwin
Type "help", "copyright", "credits" or "license" for more information.


emily-mba:cpython emily$ python2
>>> bytearray("3") == u"3"
False

emily-mba:cpython emily$ python2 -b
>>> bytearray("3") == u"3"
__main__:1: BytesWarning: Comparison between bytearray and string
False

emily-mba:cpython emily$ python2 -bb
>>> bytearray("3") == u"3"
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
BytesWarning: Comparison between bytearray and string

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nosy: +emily.zhao

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<http://bugs.python.org/issue11681>
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