Kivy，从python文件更改画布的源图片

from kivy.app import App
from kivy.uix.image import Image
from kivy.uix.floatlayout import FloatLayout

class MyApp(App):
    def build(self):
        layout = FloatLayout()
        image = Image(source='path/to/old_image.png')
        layout.add_widget(image)
        return layout

    def change_image(self):
        layout = self.root
        image = layout.children[0]  # 假设图片是布局中的第一个子组件
        image.source = 'path/to/new_image.png'  # 更新图片的源路径

        button = Button(text='Change Image', on_press=self.change_image)
        layout.add_widget(button)