[issue13896] Make shelf instances work with 'with' as context managers

[Filip Gruszczyński]

Filip Gruszczyński <gruszczy at gmail.com> added the comment:

closing was solving my problem, but I'll be happy on working on this patch, if you think it's useful after all. I don't think the stage should be test needed, since the patch has tests (I know the drill here ;-)).

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<http://bugs.python.org/issue13896>
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