The basic blog app built in the Flask tutorial
Create a virtualenv and activate it
python3 -m venv .venv
source .venv/bin/activate
pip install -e .
export FLASK_APP=flaskr
flask init-db
gunicorn --bind '0.0.0.0:5000' 'flaskr:create_app()'
Open http://127.0.0.1:5000 in a browser.