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
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