Chris Jerdonek added the comment:

Is this issue just for 2.7?  3.3 was selected as the affected version, but the 
error message text seems limited to 2.7:

http://hg.python.org/cpython/file/0adfbafe8a99/Objects/fileobject.c#l303

The exception can be reproduced simply using 2.7:

>>> open('foo', 'br')
ValueError: mode string must begin with one of 'r', 'w', 'a' or 'U', not 'br'

Moreover, the 2.7 documentation says that "b" must be appended (in particular 
occurring after "r"), which to me means that the exception and message is 
correct:

http://docs.python.org/2/library/functions.html#open

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nosy: +chris.jerdonek

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<http://bugs.python.org/issue16625>
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