code: def retrieve_list_members(self, list_, query_column, field_list, ids_to_retrieve):
          
          list_ = list_.get_soap_object(self.client)
          result = self.call('retrieveListMembers', list_, query_column, field_list, ids_to_retrieve)
          return RecordData.from_soap_type(result.recordData)
docs: Responsys.retrieveListMembers call
  
          Accepts:
              InteractObject list_
              string query_column
                  possible values: 'RIID'|'EMAIL_ADDRESS'|'CUSTOMER_ID'|'MOBILE_NUMBER'
              list field_list
              list ids_to_retrieve
  
          Returns a RecordData instance