问如何在Kivy中从频繁更新的列表创建标签的动态列表

EN

class RV(FloatLayout):  
    def re_build(self):
        label_list = [Label(text = "Label {}".format(x)) for x in range(20)]
        for count, x in enumerate(label_list):
            self.add_widget(Label(text='Hello World'), index = count)'
        


class MainScreen(Screen):  
    pass

class ScreenManagement(ScreenManager):
    pass 

class TestApp(App):
    def build(self):
        return ScreenManagement()


if __name__ == '__main__': 
      
    # Here the class MyApp is initialized 
    # and its run() method called. 
    TestApp().run() 

<ScreenManagement>:
    padding: 10
    MainScreen:
        id: main_screen
        name: 'main_screen'

<MainScreen>:
    GridLayout:
        rows:3
        cols:1


        Button:
            size_hint: 1, None
            height: 50
            text: "just setting up"
            on_press:
                root.ids.rv.re_build()

        
        RV:

            id: rv

        

        GridLayout:
            rows:3
            cols:2
            size_hint : None, None
            CheckBox:
                active:False
            Label:
                text: 'item 1'
            CheckBox:
                active:False
            Label:
                text: 'item 2'
            CheckBox:
                active:False
            Label:
                text: 'item 3'