Ryan Heisler <ryan.a.heis...@gmail.com> added the comment:

Perfect, thanks for your quick response. I was passing a bound method of obj as 
the func to `weakref.finalize(obj, func, /, *args, **kwargs)`. It slipped my 
mind that an instance variable like self.name and a bound method like 
self.clean_up, though they both belong to self, would be evaluated differently.

For anyone wondering, I was looking for weakref.proxy 
(https://docs.python.org/3/library/weakref.html#weakref.proxy) or 
weakref.WeakMethod 
(https://docs.python.org/3/library/weakref.html#weakref.WeakMethod)

----------
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42945>
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