Method trigger

IPython/core/events.py:80–91

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, *args, **kwargs)

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

    def trigger(self, event, *args, **kwargs):
        """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):
                print("Error in callback {} (for {}):".format(func, event))
                self.shell.showtraceback()

# event_name -> prototype mapping
available_events = {}