At 06:48 PM 5/9/2006 -0700, Bill Janssen wrote: >Using mixins, you'd do something like: > > class adapted_mytype (sequential_ordering, mytype): > def len(self): > return self.nitems() > >You can now use "adapted_mytype", which respects both the >"sequential_ordering" protocol and the "mytype" protocol. And a user >can use isinstance to test for that, avoiding "duck typing".
And as I pointed out already, this doesn't allow a third party to use one library's types in the context of another without monkeypatching. If I understand your proposal correctly, this approach doesn't do anything beyond what Java does, and is inferior to already-available adaptation and interface systems for today's Python. _______________________________________________ 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
