[issue11767] Maildir iterator leaks file descriptors by default

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

Ah, that's exactly why I suggested using the 'closing' context manager from contextlib.  That context manager returns the object passed to it, and then when its __exit__ method is called, calls the close method of that object that was passed to it.

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<http://bugs.python.org/issue11767>
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