code: def delete(self):
          
          self._engine.data[self.typeof] = \
              [loopback for loopback in self._engine.data.get(self.typeof, [])
               if loopback.get('address') != self.address]
              
          self._engine.update()
docs: Delete a loopback cluster virtual interface from this engine. 
          Changes to the engine configuration are done immediately.
          
          You can find cluster virtual loopbacks by iterating at the
          engine level::
          
              for loopbacks in engine.loopback_interface:
                  ...
          
          :raises UpdateElementFailed: failure to delete loopback interface
          :return: None