code: def run_app(self):
          
          # Update system arguments
          sys.argv[0] = sys.executable
          sys.argv[1] = '{}.py'.format(sys.argv[1])
  
          # Make sure to exit with the return value from the subprocess call
          self._app_process = subprocess.Popen(sys.argv)
          return self._app_process.wait()
docs: Run the App as a subprocess.