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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.Sulla.Python@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 11:59:21 +0100
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 by: Marco Sulla - Wed, 29 Dec 2021 10:59 UTC

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:

$ python
Python 3.10.0 (heads/3.10-dirty:f6e8b80d20, Nov 18 2021, 19:16:18)
[GCC 10.1.1 20200718] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import frozendict
>>> frozendict.c_ext
False
>>> from frozendict import frozendict as fd
>>> from collections.abc import MutableMapping as Mm
>>> issubclass(fd, Mm)
True
>>> @classmethod
.... def _my_subclasshook(klass, subclass):
.... if subclass == fd:
.... return False
.... return NotImplemented
....
>>> @classmethod
.... def _my_subclasshook(klass, subclass):
.... print(subclass)
.... if subclass == fd:
.... return False
.... return NotImplemented
....
>>> Mm.__subclasshook__ = _my_subclasshook
>>> issubclass(fd, Mm)
True
>>> issubclass(tuple, Mm)
<class 'tuple'>
<class 'tuple'>
<class 'tuple'>
<class 'tuple'>
<class 'tuple'>
<class 'tuple'>
False
>>>

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

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