watch.py 文件源码

def _start_process(self):
        act = 'Start' if self._reloads == 0 else 'Restart'
        logger.info('%sing dev server at http://%s:%s ?', act, self._config.host, self._config.main_port)

        try:
            tty_path = os.ttyname(sys.stdin.fileno())
        except OSError:  # pragma: no branch
            # fileno() always fails with pytest
            tty_path = '/dev/tty'
        except AttributeError:
            # on windows, without a windows machine I've no idea what else to do here
            tty_path = None

        self._process = Process(target=serve_main_app, args=(self._config, tty_path))
        self._process.start()