def _installSignalHandlersAgain(self):
        """
        wx sometimes removes our own signal handlers, so re-add them.
        """
        try:
            # make _handleSignals happy:
            import signal
            signal.signal(signal.SIGINT, signal.default_int_handler)
        except ImportError:
            return
        self._handleSignals()

        wx sometimes removes our own signal handlers, so re-add them.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/internet/wxreactor.py