[Python-Dev] PEP: Ordered Class Definition Namespace

Ethan Furman ethan at stoneleaf.us
Tue Jun 7 14:01:43 EDT 2016

On 06/07/2016 10:51 AM, Eric Snow wrote:

> My intention was to land the patch soon, having gone through code
> review during PyCon.  However, Nick pointed out to me the benefit of
> having a concrete point of reference for the change, as well as making
> sure it isn't a problem for other implementations.  So in that spirit,
> here's a PEP for the change.  Feedback is welcome, particularly from
> from other implementors.


> Specification
> =============

>    * types for which `__prepare__()`` returned something other than
>      ``OrderedDict`` (or a subclass) have their ``__definition_order__``
>      set to ``None``

I assume this check happens in type.__new__?  If a non-OrderedDict is 
used as the namespace, but a __definition_order__ key and value are 
supplied, is it used or still set to None?


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