On 2013-06-28 11:48, Thomas Heller wrote:
trying out the enum34 module.What I want to create is a subclass of enum.Enum that is also based on ctypes.c_int so that I can better use enum instances in ctypes api calls. When I do this, I get a metaclass conflict: >>> class MyEnum(ctypes.c_int, enum.Enum): ... FOOBAR = 0 ... Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: Error when calling the metaclass bases metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases >>> When I do this, it does not work either: >>> class MyEnum_meta(type(ctypes.c_int), type(enum.Enum)): ... pass
enum.EnumMeta uses super() in its __new__() implementation but _ctypes.PyCSimpleType doesn't. Thus, only _ctypes.PyCSimpleType.__new__() gets a chance to run. Switching the order of the two might work.
-- Robert Kern "I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth." -- Umberto Eco -- http://mail.python.org/mailman/listinfo/python-list
