Antoine Pitrou <pit...@free.fr> added the comment:

> I’ve also made a patch to register the caches used by
> packaging.database with the regrtest unclean environment warning; can
> someone review it?

I would call .copy() on the original dicts rather than remembering an
explicit empty dict.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue12167>
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