text: from fbs_runtime.application_context.${python_bindings} import ApplicationContext
  from ${python_bindings}.QtWidgets import QMainWindow
  
  import sys
  
  if __name__ == '__main__':
      appctxt = ApplicationContext()       # 1. Instantiate ApplicationContext
      window = QMainWindow()
      window.resize(250, 150)
      window.show()
      exit_code = appctxt.app.exec_()      # 2. Invoke appctxt.app.exec_()
      sys.exit(exit_code)