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

[Marco Sulla]

On Wed, 29 Dec 2021 at 09:12, Dieter Maurer <dieter at handshake.de> wrote:
>
> Marco Sulla wrote at 2021-12-29 08:08 +0100:
> >On Wed, 29 Dec 2021 at 00:03, Dieter Maurer <dieter at handshake.de> wrote:
> >> Why do you not derive from `dict` and override its mutating methods
> >> (to raise a type error after initialization is complete)?
> >
> >I've done this for the pure py version, for speed. But in this way,
> >frozendict results to be a subclass of MutableMapping.
>
> `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`.

Emh. Too hacky for me too, sorry :D