git clone https://github.com/starzel/flask.git
cd flask
# Create and enable virtualenv:
python3 -m venv .
source bin/activate
# install
pip install -r requirements.txt
env FLASK_APP=demo.py flask run
Run in debug-mode
env FLASK_APP=demo.py FLASK_ENV=development flask run
Open in http://localhost:5000