assigning a custom mapping type to __dict__

[Nick Coghlan]

Steven Bethard wrote:
> support.  Inheriting from dict likely means you have to redefine a bunch 
> of functions to raise Exceptions saying that they're unsupported.

Hmm. . .

We've got the NotImplemented singleton already to let special methods say "I 
thought I might be able to handle this, but I can't".

Maybe "__op__ = NotImplemented" should clear the associated slot. It would also 
make it easier to inherit from list and handle slices in __getitem__ by writing 
"__getslice__ = NotImplemented" instead of overriding __getslice__ to delegate 
to __getitem__.

Cheers,
Nick.

-- 
Nick Coghlan   |   ncoghlan at email.com   |   Brisbane, Australia
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