How to use the multimethod.__init__.overload function in multimethod

def register(self, *args):
        """Decorator for registering a function.

        Optionally call with types to return a decorator for unannotated functions.
        """
        if len(args) == 1 and hasattr(args[0], '__annotations__'):
            return overload.register(self, *args)
        return lambda func: self.__setitem__(args, func) or func