Kivy:将/默认值重置为屏幕上的所有小工具？

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

class MyLayout(BoxLayout):
    pass

def reset_values(self):
    for widget in self.children:
        widget.text = ""

class MyApp(App):
    def build(self):
        layout = MyLayout()
        
        # 添加一个重置按钮
        reset_button = Button(text="重置默认值")
        reset_button.bind(on_release=layout.reset_values)
        layout.add_widget(reset_button)
        
        return layout