kivy如何使用python在按钮上显示图像

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

class MyLayout(BoxLayout):
    def __init__(self, **kwargs):
        super(MyLayout, self).__init__(**kwargs)
        self.orientation = 'vertical'

        # 创建按钮和图像组件
        self.button = Button(text='点击显示图像', on_press=self.show_image)
        self.image = Image()

        # 将按钮和图像组件添加到布局中
        self.add_widget(self.button)
        self.add_widget(self.image)

    def show_image(self, instance):
        # 在按钮点击时加载并显示图像
        self.image.source = 'path_to_image.png'

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

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