Am 09.01.2012 03:21, schrieb Steven D'Aprano:
> What am I doing wrong?
You aren't doing anything wrong. It's just not possible to have
something different than a dict as a type's __dict__. It's a deliberate
limitation and required optimization. The __prepare__ hook allows to you
have a dict subclass as intermediate dict, but in the end it always
comes down to a dict.
The code in Objects/typeobject.c:type_new() copies the dict:
/* Initialize tp_dict from passed-in dict */
type->tp_dict = dict = PyDict_Copy(dict);
PyDict_Copy() takes an instance of a PyDict_Type subclass and always
returns a PyDictObject.
However you can use the __prepare__ hook to *remember* the order of
insertion, see
http://docs.python.org/py3k/reference/datamodel.html#customizing-class-creation
Christian
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