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public python v1 · immutablePython 2.4.4 (#2, Jul 17 2007, 11:56:54) [GCC 4.1.3 20070629 (prerelease) (Debian 4.1.2-13)] on linux2Type "help", "copyright", "credits" or "license" for more information.>>> class A(object): pass... >>> class B(object, A): pass... Traceback (most recent call last): File "<stdin>", line 1, in ?TypeError: Error when calling the metaclass bases Cannot create a consistent method resolutionorder (MRO) for bases object, A