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Thu Oct 28 13:36:35 CEST 2004 · https://mail.python.org/pipermail/python-dev/2004-October/049682.html

Tim Peters wrote:
...
> Anyone have a bright idea?  It's remarkable how long we've managed to go
> without noticing that everything is disastrously broken here <0.9 wink>.

Sure.  Clearing cyclic trash can call Python code.  If there
are weakrefs to any of the cyclic trash, then those wekrefs can
be used to resurrect the objects.  Therefore, *before* clearing cyclic
trash, we need to remove any weakrefs.  If any of the weakrefs
being removed have callbacks, then we need to save the callbacks
and call them *after* all of the weakrefs have been cleared.

Jim

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[Python-Dev] Re: Pre-existing bug of the millennium (so far)