Flask and Heroku - ModuleNotFoundError: No module named 'app'

Question

I\'m trying to deploy a Flask app to Heroku. After deploying, application crashes and I get an error ModuleNotFoundError: No module named \'app\'.

Project structure

Answer 1

web:gunicorn app:app is standard Procfile. It expects that your .py file should be named app.py.

If you want to change .py name you should change Procfile as well. web:gunicorn my_app_name:app After that you can name your file - my_app_name.py

Answer 2

On your local machine, at the base of your repository, you need to add a Procfile (exactly like this).

Inside that, paste only one line: web: gunicorn :app

Example: If you want to trigger init.py, then:

web: gunicorn init:app

Answer 3

In my case, this was resolved after I made the following changes, of course committing the changes before pushing to heroku:

1) ran pip freeze > requirements.txt,

2) moved my app.py to a different directory, and updated Procfile, manage.py -all files importing app.py- and to reflect the new location. I'm not sure if moving the file actually made a difference, it seems unlikely, but regardless, it's worth verifying all files that import app have the correct path