[issue22854] Documentation/implementation out of sync for IO

[Martin Panter]

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.

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versions:  -Python 2.7

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