由于Python绑定模拟了逻辑接口，所以不可能不通过一个服务来发送信号。

Because the Python bindings model the logical interface, it is not possible to send a signal without it coming from a service. So this example also creates a service.

youdao

由于Python绑定模拟了逻辑接口，所以不可能不通过一个服务来发送信号。

Because the Python bindings model the logical interface, it is not possible to send a signal without it coming from a service. So this example also creates a service.

youdao