R. David Murray <rdmur...@bitdance.com> added the comment:

Ah.  Well, since the io module and its classes didn't exist when that code in 
mailbox.py was written, no, that's not what happened :)

Nor does 'file like object' in Python necessarily mean conformance to the io 
specification.  We are *tending* in that direction, but the actual expected 
method set is really considerably smaller (and I'm not sure it is documented 
anywhere).

I will incorporate your suggestion into the patch, thanks.  Ezio also pointed 
out that I should be checking for the 'closed' method's existence before 
calling it, so I will add that as well.

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<http://bugs.python.org/issue11700>
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