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Sat Jan 12 05:25:45 CET 2008 · https://mail.python.org/pipermail/python-dev/2008-January/076121.html

> I'd like to take an "all or nothing" approach to this: either we
> implement the same 4 operations as for sets (|, &, ^ and -) or we
> implement none of them. .
 . . .
> I'm not sure where I stand on this proposal -- I guess a +0, if
> someone else does the work. (The abc.py module needs to be updated
> too.)

I think this would end-up being clutter, something added
just because it could be done, not because we have compelling
use cases that can't be met with existing dicts, sets, and lists.

Raymond

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[Python-Dev] PySequence_Concat for dicts