[issue5883] detach() implementation

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Reviewers: ,

Please review this at http://codereview.appspot.com/52075

Affected files:
   Doc/library/io.rst
   Lib/_pyio.py
   Lib/test/test_io.py
   Modules/_io/bufferedio.c
   Modules/_io/textio.c

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5883>
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