I created an issue on the github page: Attempting to deploy fails · Issue #2 · fly-apps/python-hellofly-flask · GitHub, but it looks like for some reason the app is being identified as a Django app during flyctl launch. That command eventually succeeds, but attempts to run flyctl deploy fail. I was able to get around this by manually updating the Dockerfile and it all worked, but from what I can tell this tutorial is not quite working smoothly out of the box at the moment.