On Thu, Sep 23, 2010 at 4:54 PM, Daniel Stutzbach <daniel@stutzbachenterprises.com> wrote:
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.
Well, with inspect it's possible to see if the extra parameters have defaults values, thus making calls without them still working.
You might be interested in the related Issue 9731 ("Add ABCMeta.has_methods and tests that use it").
Ah... interesting.. has_methods could possibly have an option to check for the signature --will hack on that when I find some time--
-- Daniel Stutzbach, Ph.D. President, Stutzbach Enterprises, LLC
-- Tarek Ziadé | http://ziade.org