How to use the uiautomator2.session.Session function in uiautomator2

resp.raise_for_status()
            jsondata = resp.json()
            if not jsondata["success"]:
                raise SessionBrokenError("app launch failed",
                                         jsondata["error"], jsondata["output"])

            time.sleep(2.5)  # wait launch finished, maybe no need
        pid = self._pidof_app(pkg_name)
        if not pid:
            if strict:
                raise SessionBrokenError(pkg_name)
            return self.session(pkg_name,
                                attach=False,
                                launch_timeout=launch_timeout)

        return Session(self, pkg_name, pid)

def __repr__(self):
        if self._pid and self._pkg_name:
            return "" % (
                self._pid, self._pkg_name)
        return super(Session, self).__repr__()

Args:
            host (str): host address
            port (int): port number

        Raises:
            EnvironmentError
        """
        self._host = host
        self._port = port
        self._adb_device = None # adbutils.Device
        self._serial = None
        self._reqsess = TimeoutRequestsSession(
        )  # use requests.Session to enable HTTP Keep-Alive
        self._server_url = 'http://{}:{}'.format(host, port)
        self._server_jsonrpc_url = self._server_url + "/jsonrpc/0"
        self._default_session = Session(self, None)
        self._cached_plugins = {}
        self._hooks = {}

        self.__devinfo = None
        self.__uiautomator_failed = False
        self.__uiautomator_lock = threading.Lock()

        self.platform = None  # hot fix for weditor

        self.ash = AdbShell(self.shell)  # the powerful adb shell
        self._freeze()  # prevent creating new attrs
        # self._atx_agent_check()