python的import问题，如何在Outter_service.py中可以调用Demo目录下的app.py，

Question

class InnerService:

    def __init__(self):
        print("inner service_1")

from servcie.inner_service import InnerService


class App:

    def __init__(self):
        print("inner app")
        InnerService()


if __name__ == '__main__':
    App()

class InnerService:

    def __init__(self):
        print("inner service_1")

from service_1.outter_service import OutterService
from Demo.app import App as DemoApp


class Main:

    def __init__(self):
        print("app")
        DemoApp()


if __name__ == '__main__':
    OutterService()

from Demo.app import App


class OutterService:

    def __init__(self):
        print("outter service_1")
        App()

project
  |--Demo
     |---service
          inner_service.py
     |---app.py
  |--service-1
       outter-service.py
  main.py