On 1 Mar 2013 03:34, "Guido van Rossum" firstname.lastname@example.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.
On Thu, Feb 28, 2013 at 2:15 AM, Eric Snow email@example.com
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
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).
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