[Python-3000] duck typing

[Bill Janssen]

> If you want a Python-lookalike with strong static typing (and optional
> duck typing with the "duck" keyword!), then try Boo:
> http://boo.codehaus.org/Home

Thanks, Antoine, but I don't want strong static typing at all.  I
wouldn't mind optional partial static typing, but what I want is
strong *dynamic* typing and a rich mixin understructure that makes it
easy to construct new classes that do exactly what I want.

Bill