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__del__ beside the __dealloc__ #3612

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brightening-eyes opened this issue May 14, 2020 · 1 comment
Open

__del__ beside the __dealloc__ #3612

brightening-eyes opened this issue May 14, 2020 · 1 comment
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Python Semantics enhancement good first issue

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@brightening-eyes
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@brightening-eyes brightening-eyes commented May 14, 2020

python3 uses del for uninitialization of classes, it would be good to have this as well, it can help to uninitialize python variables, while in dealloc we can uninitialize c variables.
this is useful for example when we are using a module that uses ctypes, or is dependent on some python initialization.
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@scoder scoder commented May 14, 2020

Right, PEP 442 allows this. Cython currently implements it the other way round and calls tp_finalize() from tp_dealloc(), but it would certainly be nice to also support __del__ directly. PR welcome.

How to do it:
The tp_finalize slot in TypeSlots.py needs to become a MethodSlot backed by __del__.
This seems worth a dedicated set of tests, maybe tests/run/pep442_tp_finalize.pyx.
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