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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