How to use the runestone.codelens.pg_encoder.is_class function in runestone

typ = type(v)

        # simple base case
        if typ in (types.FunctionType, types.MethodType):
            yield v

        # recursive cases
        elif typ in (list, tuple, set):
            for child in v:
                for child_res in visit_function_obj(child, ids_seen_set):
                    yield child_res

        elif (
            typ == dict
            or runestone.codelens.pg_encoder.is_class(v)
            or runestone.codelens.pg_encoder.is_instance(v)
        ):
            contents_dict = None

            if typ == dict:
                contents_dict = v
            # warning: some classes or instances don't have __dict__ attributes
            elif hasattr(v, "__dict__"):
                contents_dict = v.__dict__

            if contents_dict:
                for (key_child, val_child) in contents_dict.items():
                    for key_child_res in visit_function_obj(key_child, ids_seen_set):
                        yield key_child_res
                    for val_child_res in visit_function_obj(val_child, ids_seen_set):
                        yield val_child_res