code: def handler(self):
  		'Parametrized handler function'
  		return ft.partial(self.base.handler, parameter=self.parameter)\
  			if self.parameter else self.base.handlef handler(self):
  		'Parametrized handler function'
  		return ft.partial(self.base.handler, parameter=self.parameter)\
  			if self.parameter else self.base.handler
docs: Parametrized handler function