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Fri Jan 19 01:37:42 CET 2007 · https://mail.python.org/pipermail/python-dev/2007-January/070691.html

"Brett Cannon" <brett at python.org> wrote:
> I have discovered an issue relating to func_globals for functions and
> the deallocation of the module it is contained within.  Let's say you
> store a reference to the function encodings.search_function from the
> 'encodings' module (this came up in C code, but I don't see why it
> couldn't happen in Python code).  Then you delete the one reference to
> the module that is stored in sys.modules, leading to its deallocation.
>  That triggers the setting of None to every value in
> encodings.__dict__.
[snip]
> Anybody have any ideas on how to deal with this short of rewriting
> some codecs stuff so that they don't depend on global state in the
> module or just telling me to just live with it?

I would have presumed that keeping a reference to a function should have
kept the module "alive".  Why?  If a function keeps a reference to a
module's globals, then even if the module is deleted, the module's
dictionary should still persist, because there exists a reference to it,
through the reference to the function.

Seems to me like a bug, but the bug could be fixed if the module's
dictionary kept a (circular) reference to the module object.  Who else
has been waiting for a __module__ attribute?

 - Josiah

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[Python-Dev] Problem between deallocation of modules and func_globals