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Sun May 24 06:58:26 CEST 2015 · https://mail.python.org/pipermail/python-dev/2015-May/140142.html

On 05/23/2015 09:46 PM, Guido van Rossum wrote:
> How will __definition_order__ be set in the case where __prepare__ 
> doesn't return an OrderedDict? Or where a custom metaclass's __new__ 
> calls its superclass's __new__ with a plain dict? (I just wrote some 
> code that does that. :-)

In his patch, type_new tests to see if the dict passed in is an ordered 
dict (PyODict_Check).  __definition_order__ is only created and 
populated if it passes the test.

    http://bugs.python.org/file39446/odict-class-definition-namespace.diff

//arry/
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[Python-Dev] Preserving the definition order of class namespaces.