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Mon Apr 22 13:06:20 EDT 2019 · http://mail.python.org/pipermail/python-dev/2019-April/157147.html

On Fri, Apr 12, 2019 at 10:20 AM Brett Cannon <brett at python.org> wrote:

>
>> This doesn't strike me as needing an optimization through a dedicated
> method.
>

maybe a new dict mapping type -- "shared_dict" -- it would be used in
places like the csv reader where it makes sense, but wouldn't impact the
regular dict at all.

you could get really clever an have it auto-convert to a regular dict when
any changes were made that are incompatible with the shared keys...

-CHB

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Christopher Barker, Ph.D.
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[Python-Dev] Proposal: dict.with_values(iterable)