[issue18876] Problems with files opened in append mode with io module

[Antoine Pitrou]

Antoine Pitrou added the comment:

Thanks for the patch. It looks mostly ok.
Could you sign a contributor agreement so that we can move forward?
http://www.python.org/psf/contrib/

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18876>
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