I have started using the enum module () , at them moment pickling an object instance that has an EnumValues assigned to one of its attributes pickles the full enumeration, this is not efficient. I am not sure what is the best way around (I do not like the idea of having to use __getstate__/__setstate__ every time), but I guess that a EnumValue should not have a reference to an Enum instance. Maybe a better approach might be to have Enum as a metaclass so that each EnumValue only references the particular Enum class.
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