code: def set_servers(self, servers):
          
          if isinstance(servers, six.string_types):
              servers = [servers]
  
          assert servers, "No memcached servers supplied"
          self._servers = [Protocol(
              server=server,
              username=self.username,
              password=self.password,
              compression=self.compression,
              socket_timeout=self.socket_timeout,
              pickle_protocol=self.pickle_protocol,
              pickler=self.pickler,
              unpickler=self.unpickler,
          ) for server in servers]
docs: Iter to a list of servers and instantiate Protocol class.
  
          :param servers: A list of servers
          :type servers: list
          :return: Returns nothing
          :rtype: None