Noam Raphael wrote:
even in the best solution that I know of,there's now way to check if a subclass has implemented all the required methods without running it and testing if it works.
I think there are some solutions like PyProtocols, see section 2.2 on this page: http://www.python.org/cgi-bin/moinmoin/MetaClasses
But what you are wanting is used more in statically typed languages. If you want interfaces, abstract classes and virtual methods in a python-like language see boo: http://boo.codehaus.org/
It will catch errors like this at compile-time.
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