Antoine Pitrou <pit...@free.fr> added the comment:

Actually, I'm not sure it's a good idea. For example, calling 
os.ftruncate(fobj) on a py3k file object will bypass the object's internal 
buffering, ignoring any pending buffered data; the right thing to do is to call 
fobj.truncate() instead.
It may be better to simply mention in the docs that fileno() can be used on 
file-like objects to get a file descriptor, if needed.

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nosy: +loewis

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue2768>
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