[issue13585] Add contextlib.CleanupManager

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

In the meantime, I put my version up as a cookbook recipe: http://code.activestate.com/recipes/577981-cleanupmanager-for-with-statements/

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<http://bugs.python.org/issue13585>
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