[Python-Dev] PEP 442 clarification for type hierarchies

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 17:18:59 +0200,
> Stefan Behnel a écrit :
>> If a Python class with a
>> __del__ inherits from an extension type that implements
>> tp_finalize(), then whose tp_finalize() will be executed first?
> Then only the Python __del__ gets called. It should call
> super().__del__() manually, to ensure the extension type's
> tp_finalize 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.


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