My First Flask App

Tools used

• Python 3.6.4
• Virtualenv & autoenv
• Flask
• Gunicorn
• Heroku
• Git & Github

Staging/Production Workflow

1. Run app locally to ensure it works - python app.py on URL http://localhost:5000/.
2. Add changes to git: git add .
3. Commit changes: git commit -m "Some commit message"
4. Push to Heroku: git push stage master, and git push pro master
5. Push to Github: git push

Configuration Environments

Local Settings

In a .env file (see autoenv) we have:

source env/bin/activate
export APP_SETTINGS="config.DevelopmentConfig"

Automatically starts the virtual environment when entering the directory, and sets the DevelopmentConfig environment variables.

Heroku Settings

For staging run the following command:

$ heroku config:set APP_SETTINGS=config.StagingConfig --remote stage

For production:

$ heroku config:set APP_SETTINGS=config.ProductionConfig --remote pro

And in app.py:

...
app = Flask(__name__)
app.config.from_object(os.environ['APP_SETTINGS'])
...

Heroku Links

...

Other Resources

Tutorial followed - Done! Next

• Explore - https://mdyzma.github.io/2017/05/20/flask-and-travis-ci/
• http://docs.python-guide.org/en/latest/writing/tests/