Method trigger

IPython/core/events.py:92–108

Call callbacks for ``event``. Any additional arguments are passed to all callbacks registered for this event. Exceptions raised by callbacks are caught, and a message printed.

(self, event: str, *args: Any, **kwargs: Any)

        raise ValueError('Function {!r} is not registered as a {} callback'.format(function, event))

    def trigger(self, event: str, *args: Any, **kwargs: Any) -> None:
        """Call callbacks for ``event``.

        Any additional arguments are passed to all callbacks registered for this
        event. Exceptions raised by callbacks are caught, and a message printed.
        """
        for func in self.callbacks[event][:]:
            try:
                func(*args, **kwargs)
            except (Exception, KeyboardInterrupt):
                if self.print_on_error:
                    print(
                        "Error in callback {} (for {}), with arguments args {},kwargs {}:".format(
                            func, event, args, kwargs
                        )
                    )
                self.shell.showtraceback()

# event_name -> prototype mapping
available_events: dict[str, Callable[..., Any]] = {}