[Python-ideas] Support other dict types for type.__dict__

[Victor Stinner]

> And you can't use __slots__ because...?

Hum, here is an example:
---
def Enum(**kw):
   class _Enum(object):
       __slots__ = list(kw.keys())
       def __new__(cls, **kw):
           inst = object.__new__(cls)
           for key, value in kw.items():
               setattr(inst, key, value)
           return inst
   return _Enum(**kw)

components = Enum(red=0, green=1, blue=2)
print(components.red)
components.red=2
print(components.red)
components.unknown=10
---

components.unknown=10 raises an error, but not components.red=2.
__slots__ denies to add new attributes, but not to modify existing
attributes.

The idea of using a frozendict is to deny the modification of an
attribute value after the creation of the object. I don't see how to
use __slots__ to implement such constraints.

Victor