Kivy:如何用“TextInput”中的文本更新“Label%s”文本？

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.textinput import TextInput
from kivy.uix.label import Label

class MyApp(App):
    def build(self):
        layout = BoxLayout(orientation='vertical')
        
        self.text_input = TextInput(multiline=False)
        self.text_input.bind(text=self.update_label)
        
        self.label = Label(text='Label Text')
        
        layout.add_widget(self.text_input)
        layout.add_widget(self.label)
        
        return layout

    def update_label(self, instance, value):
        self.label.text = 'Label Text: {}'.format(value)

MyApp().run()

self.text_input.bind(text=self.update_label)

def update_label(self, instance, value):
    self.label.text = 'Label Text: {}'.format(value)