Deploy Python Flask hello world app using Gunicorn

Create main.py file:

from flask import Flask

app = Flask(__name__)

@app.route('/')
def hello():
    return 'Hello, World!'

if __name__=='__main__':
    app.run()

Install gunicorn:

sudo pip install gunicorn

Run Flask app on port 8000 with Gunicorn:

gunicorn main:app

where:
main - name on the python file
app - name of Flask application component

Spin multiple workers by adding -w option to the command:

gunicorn main:app -w 3