On Thu, Sep 23, 2010 at 9:37 AM, Tarek Ziadé <ziade.tarek@gmail.com> wrote:
The problem is that the implemented method could have a different list
of arguments and will eventually fail.

A slightly different argument list is okay if it is more permissive.  For example, the collections.Sequence ABC defines a count method with one parameter.  However, the list implementation's count method takes one mandatory parameter plus two optional parameters.  I'm not sure how easy it would be to detect a valid but more general signature.

You might be interested in the related Issue 9731 ("Add ABCMeta.has_methods and tests that use it").

Daniel Stutzbach, Ph.D.
President, Stutzbach Enterprises, LLC