如何从不同的py文件制作kivy应用

my_kivy_app/
├── main.py
└── ui/
    ├── __init__.py
    └── main_window.py
└── logic/
    ├── __init__.py
    └── app_logic.py

from kivy.app import App
from ui.main_window import MainWindow
from logic.app_logic import AppLogic

class MyApp(App):
    def build(self):
        self.logic = AppLogic()
        return MainWindow(logic=self.logic)

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

from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button

class MainWindow(BoxLayout):
    def __init__(self, logic, **kwargs):
        super(MainWindow, self).__init__(**kwargs)
        self.orientation = 'vertical'
        self.logic = logic
        btn = Button(text='Click Me')
        btn.bind(on_press=self.on_button_click)
        self.add_widget(btn)

    def on_button_click(self, instance):
        self.logic.process()

class AppLogic:
    def process(self):
        print("Button clicked! Processing...")

python main.py