At 06:40 PM 4/25/2007 -0400, Jean-Paul Calderone wrote: >On Wed, 25 Apr 2007 18:10:23 -0400, Jim Jewett <[EMAIL PROTECTED]> wrote: > >The current ABC proposal is to use isinstance as the test; Jeffrey > >Yaskin's numbers PEP highlighted the weakness there with a concrete > >example. > > > >If you need to an abstraction less powerful than an existing ABC, > >you're out of luck; you can't just assert that the existing class is > >already sufficient, nor can you expect everyone else to use multiple > >annotations. > >I'm sure everyone is already aware of the behavior of the classImplements >and directlyProvides functions available in zope.interface, which exactly >satisfy this use-case in the interface world.
I'm either misunderstanding Jim or you, because I don't see the relationship here. If I understand Jim correctly, he's actually asking for something like PyProtocols' "protocolIsSubsetOf" declaration -- something that would be like dynamically adding a superclass to an existing interface in zope.interface. Whereas the features you're talking about sound like declaring that a class object itself implements an interface -- something apparently unrelated to the question at hand. _______________________________________________ Python-3000 mailing list Python-3000@python.org http://mail.python.org/mailman/listinfo/python-3000 Unsubscribe: http://mail.python.org/mailman/options/python-3000/archive%40mail-archive.com
