Flask: Cannot Deploy App to Heroku, No Module named 'app' - python

I'm trying to deploy my app to Heroku. My folder structure is this:
All my code is written inside __init__.py, and I run this by just typing flask run while in the root directory. This works fine. However, I tried deploying this app to Heroku and I got the following error:
remote: -----> Discovering process types
remote:
remote: ! Push failed: cannot parse Procfile.
remote: ! Please try pushing again.
remote: ! If the problem persists, see https://help.heroku.com/ and provide Request ID 266c0fb8-18bd-a262-5d3a-4355cd83bb02.
remote:
remote:
remote: Verifying deploy...
remote:
remote: ! Push rejected to submission-form.
remote:
My Procfile contains this: web: gunicorn app:app and my app.py contains this:
from app import app
app.run(debug=True)
If I try running python app.py, my modules are reported missing:
Traceback (most recent call last):
File "app.py", line 1, in <module>
from app.app import app
File "D:\Gatsby\submission\flask-tailwindcss-starter\app\__init__.py", line 4, in <module>
from contentful_management import Client
ModuleNotFoundError: No module named 'contentful_management'
This is despite them being there and running perfectly when I use flask run. What is going wrong here? How do I fix this so I can push this app to deploy on Heroku? I'm guessing this has something to do with my procfile.
Edit: My repo is attached here, if it helps


You are calling app from app.app module. First there is no module app.app and there is no app defined.
try this :
from app import create_app
app = create_app()
app.run(debug=True)

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Procfile: https://i.stack.imgur.com/gDQIv.png
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-----> Python app detected
-----> Installing requirements with pip
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I'm building a small Flask app that will have user login, and a few other pages that will allow the user to run queries against a database.
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remote: Traceback (most recent call last):
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Cloning into 'myflaskapp2'...
The authenticity of host 'myflaskapp2-pyderman.rhcloud.com ' can't be established.
RSA key fingerprint is ......
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'myflaskapp2-pyderman.rhcloud.com' (RSA) to the list of known hosts.
Your application 'myflaskapp2' is now available.
The fact that it finished with 'your application is now available' though would suggest that things are OK with with the SSH key.
I've taken a look at this post, but it doesn't shed any light, as I don't think I am running a "DIY" application (whatever that is).
Any help much appreciated.

I know is late but I faced the same problem yesterday and I was able to solve it.
This happens when there's already a socket in the port your app is using. What to do? SSH into you server, kill your app process and push again.
Another option is that you're using the wrong port. You should use the port and IP from the environment variables (if you are using Python: OPENSHIFT_PYTHON_IP and OPENSHIFT_PYTHON_PORT)
About your second question: If you used a custom cartridge or use diy-0.1 cartridge then your app is running over diy. If you used python-2.6, 2.7 or 3.3 then is not.

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You probably need to add Flask (and any other external dependencies) to a requirements.txt and include it in your repo.
You can use 'pip freeze > requirements.txt" to create it with what ever packages you have installed in your environment at the moment.

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