content: class NoUpdate:
      def to_plotly_json(self):  # pylint: disable=no-self-use
          return {"_dash_no_update": "_dash_no_update"}
  
      @staticmethod
      def is_no_update(obj):
          return (
              obj is NoUpdate
              or isinstance(obj, NoUpdate)
              or (isinstance(obj, dict) and obj == {"_dash_no_update": "_dash_no_update"})
          )
  