code: def add_property_orders(query_proto, *orders):
    for order in orders:
      proto = query_proto.order.add()
      if order[0] == '-':
        order = order[1:]
        proto.direction = query_pb2.PropertyOrder.DESCENDING
      else:
        proto.direction = query_pb2.PropertyOrder.ASCENDING
      proto.property.name = order