在Kivy中处理与其源相关的键盘输入

from kivy.app import App
from kivy.uix.widget import Widget
from kivy.core.window import Window
from kivy.uix.label import Label

class MyWidget(Widget):
    def __init__(self, **kwargs):
        super(MyWidget, self).__init__(**kwargs)
        self.label = Label(text="Press a key", font_size=30)
        self.add_widget(self.label)

    def on_key_down(self, keyboard, keycode, text, modifiers):
        self.label.text = f"Key pressed: {text}"

class MyApp(App):
    def build(self):
        Window.size = (400, 300)
        Window.title = "Keyboard Input"
        return MyWidget()

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