Hi, I wonder if anyone can give me a hand with this problem here: I've got exported class: class_<MyInterface>( "MyInterface" ) ... And I've got class in Python: class ABC(object): ... I am doing some processing of the class definition in Python and want to be able to do the following (clazz here is ABC: clazz.__bases__ = (MyInterface,) + clazz.__bases__ I am getting following error: TypeError: __bases__ assignment: 'MyInterface' deallocator differs from 'object' I can add mixins defined in Python fine. Only mixins exported from C++ giving me a problem. Any advise? Gennadiy