[Python-3000] PEP for Metaclasses in Python 3000

[Phillip J. Eby]

At 05:30 PM 3/12/2007 -0700, Guido van Rossum wrote:
>I don't know about sealed, but using class attributes topassing
>parameter (other than the namespace itself) to the metaclass seems a
>pretty lousy mechanism, and keyword arguments in the classdef are a
>much cleaner solution for this need. For example, this solves the
>problem that those attributes remain in the class dict  but aren't
>necessarily candidates for inheritance

Ah, I missed that point about the new kwargs mechanism!  Before I was +0 on 
*args/**kw, now I'm +1.  I've actually needed that feature more than once, 
but  have been doing it with specialized in-body class decorators, like this:

     class FooService(context.Service):
         context.replaces(BarService)
         ...

Which could presumably now become:

     class FooService(context.Service, replaces=BarService):
         ...

Right?