Eli Bendersky <eli...@gmail.com> added the comment:

In Python 3, the documentation no longer mentions that 'U' should not work with 
'+' (or 'w' or 'a', for that matter), and the code throws ValueError if 'U' is 
used with 'w' or 'a', but not '+'.

On the other hand, the documentation *does* mention that 'U' is for backwards 
compatibility and shouldn't be used with new code.

In light of this, how do you suggest to proceed with this issue?

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue2091>
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