def process_finished():    '''    进程运行结束的回调函数    '''    print(">> Process finished!")  process = QProcess()  process.finished.connect(process_finished)process.start("python3", ['dummy_script.py'])# 也可 process.start('main.exe')process.waitForStarted(2000)

start：主线程结束，子线程也被迫结束
startDetached：分离模式，主线程结束，子线程不受影响继续运行

停止子线程

def kill_process(process):    process.terminate()    process.waitForFinished()    process.kill()

如果无效可以更换为：

def kill_process(process):    def kill_finished():        pass    cmd = 'taskkill -t  -f /pid ' + str(process.processId())    p = QProcess()      p.finished.connect(kill_finished)    p.startDetached(cmd)

确保只有一个子线程运行

class MyMainWindow(Ui_MainWindow):    def __init__(self) -> None:        super().__init__()        self.current_process = None     def process_finished(self):        '''        进程运行结束的回调函数        '''        print(">> Process finished!")        self.current_process = None     def do_run_program(self, exe_path, gui_name=''):        '''        调用子进程实际运行某个具体的小程序        exe_path: exe所在相对路径或绝对路径        gui_name: 显示名称,可空        '''        # 确保当前小程序存在        if not os.path.exists(exe_path):            print('>> [×]exe文件不存在或错误 => ' + exe_path)            return False        # 确保当前只有一个小程序在运行        if self.current_process is None:            self.debug('>> 即将运行 => %s[%s]' % (gui_name, exe_path))            self.current_process = QProcess()              self.current_process.finished.connect(self.process_finished)            self.current_process.start(exe_path)            self.current_process.waitForStarted(2000)            print('>> [√]启动成功，请稍等几秒')            return True        else:            print('>> [×]已有其他程序正在运行，请先停止')            return False

提示QT_DEVICE_PIXEL_RATIO is deprecated

# 消除warningdef suppress_qt_warnings():    os.environ["QT_DEVICE_PIXEL_RATIO"] = "0"    os.environ["QT_AUTO_SCREEN_SCALE_FACTOR"] = "1"    os.environ["QT_SCREEN_SCALE_FACTORS"] = "1"    os.environ["QT_SCALE_FACTOR"] = "1" suppress_qt_warnings()