def fireSystemEvent(self, eventType):
        """See twisted.internet.interfaces.IReactorCore.fireSystemEvent.
        """
        event = self._eventTriggers.get(eventType)
        if event is not None:
            event.fireEvent()
See twisted.internet.interfaces.IReactorCore.fireSystemEvent.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/internet/base.py