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Showing content from https://mail.python.org/pipermail/python-dev/2012-December/123407.html below:

[Python-Dev] test___all__ polluting sys.modules?

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On 30/12/2012 9:52pm, Antoine Pitrou wrote:
> If you have an object with a __del__ method as a module global, the
> cyclic gc will refuse to consider the module globals at all (which
> means it will affect unrelated objects).
>
> So, yes, I think the shutdown purge is still necessary. Perhaps there
> are ways to make it smarter.

With my earlier suggestion a module deleted from sys.modules before 
shutdown can have an unreclaimable global dict (if it contains a global 
with a __del__ method).

Perhaps, instead, modules could use a weakrefable subclass of dict for 
their globals dicts.  The module destructor could save the global dicts 
of deleted modules in a registry.  At shutdown any remaining globals 
dicts can be purged.

-- 
Richard

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