[issue5016] FileIO.seekable() can return False

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> Needs backport to trunk and 2.6, if someone is interested.

I'm interrested by a backport at least in trunk. I updated the patch 
to trunk:
 - test directly _file._FileIO() instead of using open() because in 
Python trunk, a file has no seekable() method :-/
 - use contextlib.closing() because _FileIO doesn't implement context 
API (not __exit__() method)

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Added file: http://bugs.python.org/file13429/fileio_seekable-trunk.patch

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