from serial import Serialfrom serial.tools.list_ports import comportsfrom websocket_server import WebsocketServer@route('/')def index(info=''):    return template('index.html', sers=[(desc, port) for port, desc, hwid in comports()],                                  ws_url=request.url.replace('http', 'ws').replace('8080', '9978'))template中 sers=[(desc, port) for port, desc, hwid in comports()]這是什么語法？