code: def unsubscribe_multi(self, topics):
          
          if self.sock == NC.INVALID_SOCKET:
              return NC.ERR_NO_CONN
          
          self.logger.info("UNSUBSCRIBE: %s", ', '.join(topics))
          return self.send_unsubscribe(False, [utf8encode(topic) for topic in topics])
docs: Unsubscribe to some topics.