On Wed, 29 Dec 2021 at 12:11, Dieter Maurer <die...@handshake.de> wrote: > > Marco Sulla wrote at 2021-12-29 11:59 +0100: > >On Wed, 29 Dec 2021 at 09:12, Dieter Maurer <die...@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) -- https://mail.python.org/mailman/listinfo/python-list
