Martin Panter added the comment:

I gave up on porting the fix to 2.7. Python 3 raises UnsupportedOperation 
(which inherits ValueError) in many cases due to Issue 9293, but Python 2 
raises IOError (which does not inherit ValueError). Changing how 
BufferedWriter.read() etc work in Python 2 would break test_io_after_close(). 
Also, none of the doc strings in Python 2 need fixing.

Also according to the buildbots, Windows can seek in pipes. Or at least tell() 
doesn’t raise an exception. So I skipped the seek testing on Windows.

----------
versions:  -Python 2.7

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue22854>
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