Method _remove_notifiers

traitlets/traitlets.py:1593–1602

(
        self, handler: t.Callable[..., t.Any] | None, name: Sentinel | str, type: str | Sentinel
    )

            nlist.append(handler)

    def _remove_notifiers(
        self, handler: t.Callable[..., t.Any] | None, name: Sentinel | str, type: str | Sentinel
    ) -> None:
        try:
            if handler is None:
                del self._trait_notifiers[name][type]
            else:
                self._trait_notifiers[name][type].remove(handler)
        except KeyError:
            pass

    def on_trait_change(
        self,