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I'll send a patch that updates/fixes handling of
file closes in the internal proxy-file classes.
It could cause errors yet because self._file is
del-eted but that field may still be used afterwards.
>>> mb = mailbox.Maildir('sdaoden', create=False)
>>> mbf = mb.get_file(mb.keys()[0])
>>> msg = email.parser.BytesParser().parse(mbf, headersonly=True)
>>> mbf.close()
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/Users/steffen/usr/opt/py3k/lib/python3.3/mailbox.py", line 1922, in close
 if hasattr(self._file, 'close'):
AttributeError: '_ProxyFile' object has no attribute '_file'
The patched version will always act correctly.
And yes, i'll open yet another issue due to the
email.parser (or even TextIOWrapper) based problem.