我想要一个在python kivy中重新启动我的程序的按钮。

from kivy.app import App
from kivy.uix.button import Button

class RestartButton(Button):
    def on_press(self):
        App.get_running_app().stop()  # 停止当前应用
        App.get_running_app().start()  # 启动新的应用实例

class MyApp(App):
    def build(self):
        return RestartButton(text='重新启动')

if __name__ == '__main__':
    MyApp().run()

from kivy.uix.boxlayout import BoxLayout

class MyLayout(BoxLayout):
    def __init__(self, **kwargs):
        super(MyLayout, self).__init__(**kwargs)
        self.orientation = 'vertical'
        self.add_widget(Label(text='Hello, Kivy!'))
        self.add_widget(RestartButton(text='重新启动'))

class MyApp(App):
    def build(self):
        return MyLayout()

if __name__ == '__main__':
    MyApp().run()