[Python-Dev] PEP: Ordered Class Definition Namespace

Eric Snow ericsnowcurrently at gmail.com
Tue Jun 7 14:13:45 EDT 2016

On Tue, Jun 7, 2016 at 11:01 AM, Ethan Furman <ethan at stoneleaf.us> wrote:
> On 06/07/2016 10:51 AM, Eric Snow wrote:
>> 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?

A __definition_order__ in the class body always takes precedence.  So
a supplied value will be honored (and not replaced with None).


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