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Thu Jan 31 00:11:28 EST 2019 · https://mail.python.org/pipermail/python-dev/2019-January/156160.html

On Thu, 31 Jan 2019 at 15:46, Raymond Hettinger <raymond.hettinger at gmail.com>
wrote:

>
> > Would it be practical to add deprecated methods to regular dict for the
> OrderedDict reordering methods that raise with an error suggesting "To use
> this method, convert dict to OrderedDict." (or some better wording).
>
> That's an interesting idea.  Regular dicts aren't well suited to the
> reordering operations (like lists, repeated inserts at the front of the
> sequence wouldn't be performant relative to OrderedDict which uses
> double-linked lists internally).  My instinct is to leave regular dicts
> alone so that they can focus on their primary task (being good a fast
> lookups).
>

Alternatively, would it be viable to make OrderedDict work in a way that so
long as you don't use any reordering operations it's essentially just a
very thin layer on top of a dict, but if you do use any reordering
operations, it adds in the additional heavyweight structure required to
support that?

I'm pretty sure something similar has been considered before, but thought I
should bring it up in the context of this discussion (if only to have to
shot down).

Tim Delaney
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[Python-Dev] How to update namedtuple asdict() to use dict instead of OrderedDict