[Python-Dev] PEP 442 clarification for type hierarchies (original) (raw)

Stefan Behnel stefan_ml at behnel.de
Tue Aug 6 18:38:51 CEST 2013

Antoine Pitrou, 06.08.2013 17:49:

Le Tue, 06 Aug 2013 17🔞59 +0200, Stefan Behnel a écrit :

If a Python class with a del inherits from an extension type that implements tpfinalize(), then whose tpfinalize() will be executed first? Then only the Python del gets called. It should call super().del() manually, to ensure the extension type's tpfinalize gets called.

Ok, but then all I have to do in order to disable C level finalisation for a type is to inherit from it and provide an empty del method.

I think that disqualifies the feature for the use in Cython. Finalisation at the Python level is nice, but at the C level it's usually vital. I had originally read this PEP as a way to get better guarantees than what dealloc can provide, but your above statement makes it rather the opposite.

Stefan

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