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Thu Jan 13 02:18:48 CET 2005 · https://mail.python.org/pipermail/python-dev/2005-January/050968.html

At 05:54 PM 1/12/05 -0700, Steven Bethard wrote:
>Not that my opinion counts for much =), but returning None does seem
>much simpler to me.  I also haven't seen any arguments against this
>route of handling protocol nonconformance...  Is there a particular
>advantage to the exception-raising scheme?

Only if there's any objection to giving the 'object' type a default 
__conform__ method that returns 'self' if 'isinstance(protocol,ClassTypes) 
and isinstance(self,protocol)'.

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[Python-Dev] Re: PEP 246: LiskovViolation as a name