Simple flask application :)

Firstly you need to prepare config_dev.py file in app/config:

#!/usr/bin/env python3
"""Developer config."""
class APP:
    IP = "0.0.0.0"
    PORT = 12000
    SECRET_KEY = 'test123'
class DB:
    USER = 'books_manager'
    PASSWORD = 'postgres1'
    HOST = '0.0.0.0'
    PORT = 5432
    DBNAME = 'books_db'

In folder with Makefile run commands:
make venv which creates virtualenv and install all required dependencies
make dev_run which runs app locally ("localhost:5000/")

If you don't have installed postgres you can use docker-compose.yml in docker directory: docker-compose up -d

When everything is working, you need to create table in database: source venv/bin/activate python manage.py

Firstly install heroku cli and create account: Heroku DOC

1. heroku create only if it's new app, omit this step if you want just update.
2. git push heroku master or if you want push changes from another branch to test run: git push heroku <branch>:master.
3. set environmental variable: heroku config:set APP_SECRET_KEY=some_secret

1. heroku open or heroku open --app <app_name> opens application in web browser.
2. heroku list shows list of your apps.
3. heroku logs --tail shows logs.