In a couple of minutes, deploy the simplest flask app that can be run on heroku server.

1. Here app:app is something similar to from app import app First app is written because of filename and second app is written because of the variable in the file which is our app to run by gunicorn
2. requirements.txt file is absolutely necessary for heroku to understand that this is python project

1. heroku logs -t -a <app_name> to view server logs continuously
2. heroku ps to see running thread/service
3. https://devcenter.heroku.com/articles/getting-started-with-python#introduction for more