使用键盘按钮控制Kivy滑块？

from kivy.app import App
from kivy.uix.slider import Slider
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label

class MyLayout(BoxLayout):
    def __init__(self, **kwargs):
        super(MyLayout, self).__init__(**kwargs)

        # 创建一个滑块和一个标签
        self.slider = Slider(min=0, max=100, value=50)
        self.label = Label(text=str(self.slider.value))

        # 将滑块和标签添加到布局中
        self.add_widget(self.slider)
        self.add_widget(self.label)

        # 绑定滑块的value属性变化到更新标签的回调函数
        self.slider.bind(value=self.update_label)

    def update_label(self, instance, value):
        # 更新标签的文本为滑块的当前值
        self.label.text = str(value)

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

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