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Mon Sep 26 04:52:21 EDT 2005 · http://mail.python.org/pipermail/python-list/2005-September/320859.html

Catalin Marinas wrote:
> Hi,
>
> Sorry if this was previously discussed but it's something I miss in
> Python. I get around this using isinstance() but it would be cleaner
> to have separate functions with the same name but different argument
> types. I think the idea gets quite close to the Lisp/CLOS
> implementation of methods.

Guido himself addressed multimethods in his Artima blog:

http://www.artima.com/weblogs/viewpost.jsp?thread=101605

See also the subsequent discussion about subtyping problems. 

Kay

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Parametric Polymorphism