R. David Murray <rdmur...@bitdance.com> added the comment:

Well, then I suppose my question is why isn't __contains__ looked up?  Other 
special methods that don't exist on Y do cause __getattr__ to be called.  Why 
is __contains__ special?  The docs for __getattr__ don't hint at this 
possibility either.

I think the people that understand this must have a mental model of how the 
interpreter looks up methods that has some pieces that are missing from mine.  
I guess I'd like those bits to be made explicit in the special method lookup 
docs, or if they are already documented somewhere, for there to be a pointer to 
them in the special method lookup docs.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue11988>
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