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

I don't think this patch satisfies Raymond's request.  It is explicitly 
checking for a __missing__ attribute, but Raymond was talking about a more 
general facility whereby you can pass in an arbitrary object that implements 
the mapping interface.  Using the __missing__ facility was just an example of 
why this would be useful.

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nosy: +r.david.murray

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<http://bugs.python.org/issue6081>
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