code: def display_value(self, value):
          
  
          if not (isinstance(value, bool) or value == 'all'):
              raise InvalidUsage("Display value can be of type bool or value 'all'")
  
          self._sysparms['sysparm_display_value'] = value
docs: Sets `sysparm_display_value`
  
          :param value:  Bool or 'all'