How to use the keen.direction.is_valid_direction function in keen

def _order_by_dict_is_not_well_formed(d):
            if not isinstance(d, dict):
                # Bad type.
                return True
            if "property_name" in d and d["property_name"]:
                if "direction" in d and not direction.is_valid_direction(d["direction"]):
                    # Bad direction provided.
                    return True
                for k in d:
                    if k != "property_name" and k != "direction":
                        # Unexpected key.
                        return True
                # Everything looks good!
                return False
            # Missing required key.
            return True