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Showing content from http://mail.python.org/pipermail/python-dev/2002-September/028616.html below:

[Python-Dev] Proposed Mixins for Wide Interfaces

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> > [RH]
> > > > How about adding some mixins to simplify the
> > > > implementation of some of the fatter interfaces?

[GvR]
> On second thought, I don't think there's enough here to warrant
> putting this in the standard library.  E.g. the example from BaseSet
> actually strikes me as indirect: because <= is the natural operation
> to provide for sets, hanging everything off __lt__ looks forced.

Agreed.

How about the MappingMixin and SequenceMixin?  These both
provide much more meat and have more natural attach points
(getitem, setitem, delitem).

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