def fire_event(self, event, *args, **kwargs):
        """ Execute the listeners for this event passing any arguments
        along. """
        remove = []
        event_stack = self._events[event]
        for x in event_stack:
            x['callback'](*args, **kwargs)
            if x['single']:
                remove.append(x)
        for x in remove:
            event_stack.remove(x)
Execute the listeners for this event passing any arguments
        along.