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Tue Aug 25 09:56:38 CEST 2015 · https://mail.python.org/pipermail/python-dev/2015-August/141338.html

Hi Armin,

On 25.08.2015 12:51, Armin Rigo wrote:
> Hi Valentine,
>
> On 24 August 2015 at 20:43, Valentine Sinitsyn
> <valentine.sinitsyn at gmail.com> wrote:
>> So you mean that this was to keep things backwards compatible for
>> third-party extensions? I haven't thought about it this way, but this makes
>> sense. However, the behavior of Python code using objects with __del__ has
>> changed nevertheless: they are collectible now, and __del__ is always called
>> exactly once, if I understand everything correctly.
>
> Yes, I think so.  There is a *highly obscure* corner case: __del__
> will still be called several times if you declare your class with
> "__slots__=()".
Even on "post-PEP-0442" Python 3.4+? Could you share a link please?

Thanks,
Valentine

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[Python-Dev] tp_finalize vs tp_del sematics