Problems with subclassing enum34
Thomas Heller
theller at ctypes.org
Fri Jun 28 06:48:38 EDT 2013
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
...
>>> class MyEnum(ctypes.c_int, enum.Enum):
... FOOBAR = 42
... __metaclass__ = MyEnum_meta
...
>>> MyEnum.FOOBAR
42
>>>
It should have printed '<MyEnum.FOOBAR: 42>'.
Any ideas?
Thanks,
Thomas
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