code: def DbGetDeviceAlias(self, argin):
          
          self._log.debug("In DbGetDeviceAlias()")
          ret, dev_name, dfm = check_device_name(argin)
          if not ret:
              th_exc(DB_IncorrectDeviceName,
                    "device name (" + argin + ") syntax error (should be [tango:][//instance/]domain/family/member)",
                    "DataBase::DbGetDeviceAlias()")
  
          return self.db.get_device_alias(dev_name)
docs: Return alias for device name if found.
  
          :param argin: The device name
          :type: tango.DevString
          :return: The alias found
          :rtype: tango.DevString