code: def notification_filters(self):
          
          if self._notification_filter_manager is None:
              self._notification_filter_manager = NotificationFilterManager(session=self._session)
          return self._notification_filter_manager
docs: Property for accessing :class:`NotificationFilterManager` instance, which is used to manage notification
          filters.
  
          :rtype: yagocd.resources.notification_filter.NotificationFilterManager