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devel / comp.lang.python / Re: What's the public API alternative to _PyObject_GC_IS_TRACKED()?

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o Re: What's the public API alternative to _PyObject_GC_IS_TRACKED()?Marco Sulla

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Re: What's the public API alternative to _PyObject_GC_IS_TRACKED()?

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From: Marco.Su...@gmail.com (Marco Sulla)
Newsgroups: comp.lang.python
Subject: Re: What's the public API alternative to _PyObject_GC_IS_TRACKED()?
Date: Wed, 29 Dec 2021 13:45:12 +0100
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 by: Marco Sulla - Wed, 29 Dec 2021 12:45 UTC

On Wed, 29 Dec 2021 at 12:11, Dieter Maurer <dieter@handshake.de> wrote:
>
> Marco Sulla wrote at 2021-12-29 11:59 +0100:
> >On Wed, 29 Dec 2021 at 09:12, Dieter Maurer <dieter@handshake.de> wrote:
> >> `MutableMapping` is a so called abstract base class (--> `abc`).
> >>
> >> It uses the `__subclass_check__` (and `__instance_check__`) of
> >> `abc.ABCMeta` to ensure `issubclass(dict, MutableMapping)`.
> >> Those can be customized by overriding `MutableMapping.__subclasshook__`
> >> to ensure that your `frozendict` class (and their subclasses)
> >> are not considered subclasses of `MutableMapping`.
> >
> >It does not work:
> > ...
> >>>> issubclass(fd, Mm)
> >True
>
> There is a cache involved. The `issubclass` above,
> brings your `fd` in the `Mn`'s subclass cache.

It works, thank you! I had to put it before

Mapping.register(frozendict)

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