Unpickling classes not defined on the receiving end

As stated in the pickle documentation, classes are normally pickled in such a way that they require the exact same class to be present in a module on the receiving end. However, I do note that there's also some __getstate__() and __setstate__() methods for classes, which affect how their instance开发者_如何学JAVAs are pickled...

How feasible would it be to create a metaclass that would allow pickling and unpickling of the classes created from that metaclass (in other words, the instances of that metaclass) even without the classes being present on the receiving end? (Though I think the metaclass would probably have to be present.)

Would utilizing a __reduce__() method in the class or metaclass also be something to look into?

The classes have to be somehow present on the receiving end, because methods are not stored with the objects. So, I think that using a specific metaclass unfortunately can't help, here…