Tim Peters <t...@python.org> added the comment:

> While Neil & I haven't thought of ways that can go wrong now
> beyond that a "surprise finalizer" may get run any number of
> times ...

Speaking of which, I no longer believe that's true.  Thanks to the usual layers 
of baffling renaming via macro after macro, I missed object.c's 
PyObject_CallFinalizerFromDealloc(), which both respects and sets the "am I 
finalized?" flag regardless of how, e.g., an object with a __del__ ends its 
life (and possibly resurrects).

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38006>
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