sudo apt update
sudo apt install software-properties-common
sudo apt install python3-pip
sudo pip3 install flask
sudo pip3 install gunicorn
export FLASK_APP="app.main:create_app"
flask run
gunicorn -w 4 "app.main:create_app(testing=True)"
Live edit: gunicorn -w 4 --reload "app.main:create_app(testing=True)"
set port: gunicorn -w 4 --reload -b localhost:5000 "app.main:create_app(testing=True)"