On second thought, I think I'll do this for the pure py version. But I will definitely not do this for the C extension, since it's anyway strange that an immutable mapping inherits from a mutable one! I've done it in the pure py version only for a matter of speed.
On Wed, 29 Dec 2021 at 09:24, Marco Sulla <marco.sulla.pyt...@gmail.com> wrote: > > On Wed, 29 Dec 2021 at 09:12, Dieter Maurer <die...@handshake.de> wrote: > > > > Marco Sulla wrote at 2021-12-29 08:08 +0100: > > >On Wed, 29 Dec 2021 at 00:03, Dieter Maurer <die...@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 -- https://mail.python.org/mailman/listinfo/python-list
