[Python-3000] Revised PEP 3119 (Abstract Base Classes) (original) (raw)
Phillip J. Eby pje at telecommunity.com
Wed May 16 03:54:56 CEST 2007
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At 06:34 PM 5/15/2007 -0700, Guido van Rossum wrote:
> Have I missed something? It would seem that when dealing with ABCs > that provide concrete methods, "isinstance(x, SomeABC) == True" is > useless.
The intention is that you shouldn't register such cases. This falls under the consenting-adults rule.
Not only that, but the presence of the isinstance()/issubclass() hooks actually means that if you want to create your own "Role" or "Interface" types that actually verify your requirements, you can do so!
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