Cannot load submodule

I have a project with structure below:

- /
  |- src
    |- main.py
    |- __init__.py
    |- submodule
      |- __init__.py
      |- ... 
    |- web
      |- web.py
      |- __init__.py
  |- Dockerfile

main.py calls entry function defined in web.py, and web.py calls functions defined in submodule. It works fine with command line python main.py. Then I plan to deploy it under docker, with Dockerfile:

FROM tiangolo/uwsgi-nginx-flask:python3.6
COPY ./src/* /app/

Build and run, I got error:

Traceback (most recent call last):
  File "./main.py", line 1, in <module>
    from web import run
  File "./web.py", line 5, in <module>
    import submodule
ModuleNotFoundError: No module named 'submodule'

Why did uwsgi cannot find submodule? Did I miss something?

[YTed]

Thanks @tiangolo and @frankjdelgado, it finally works.

[tiangolo]

Thanks @frankjdelgado for the help!

So, @YTed , your problem inspired me to add more specific documentation for those cases.

I just created a new release with an example project using a Python package structure (like you). You can download the example project here.

I also updated the README docs on how to use the flask run commands, that would be the equivalent of python main.py but will work even if you have a package structure.

…and as an extra, I’m creating a pull request to your project, so you can see exactly what I changed to make it work. 🎉

Let me know if you still have problems after that, or otherwise, you can close this issue.