[Python-ideas] OrderedDict for kwargs and class statement namespace

[Nick Coghlan]

On 1 Mar 2013 03:34, "Guido van Rossum" <guido at python.org> wrote:
>
> Hm. I write code regularly that takes a **kwargs dict and stores it
> into some other longer-lasting datastructure. Having that other
> datastructure suddenly receive OrderedDicts instead of plain dicts
> might definitely cause some confusion and possible performance issues.
> And I don't recall ever having wanted to know the order of the kwargs
> in the call.
>
> But even apart from that backwards incompatibility I think this
> feature is too rarely useful to make it the default behavior -- if
> anything I want **kwargs to become faster

And PEP 422 is designed to make it easier to share a common __prepare__
method with different post processing.

Cheers,
Nick.

>
> On Thu, Feb 28, 2013 at 2:15 AM, Eric Snow <ericsnowcurrently at gmail.com>
wrote:
> > Just wanted to put out some feelers for the feasibility of these two
> > features:
> >
> > * have the **kwargs param be an OrderedDict rather than a dict
> > * have class definitions happen relative to an OrderedDict by default
rather
> > than a dict, and still overridable by a metaclass's __prepare__().
> >
> > Both of these will need OrderedDict in C, which is getting close (issue
> > #16991).
> >
> > -eric
> >
> >
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>
>
>
> --
> --Guido van Rossum (python.org/~guido)
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