code: def clear_db_attribute(self, table, record, column):
          
          command = ovs_vsctl.VSCtlCommand('clear', (table, record, column))
          self.run_command([command])
docs: Clears values from 'column' in 'record' in 'table'.
  
          This method is corresponding to the following ovs-vsctl command::
  
              $ ovs-vsctl clear TBL REC COL