Running app:

• Create the environment:

  $ mkdir myproject
  $ cd myproject
  $ python3 -m venv .venv
  

• Activate the Environment:

  $ . .venv/bin/activate

• Install Flask in the Environment:

  $ pip install Flask

• Run the app:

  $ flask --app hello run
  * Serving Flask app 'hello'
  * Running on http://127.0.0.1:5000 (Press CTRL+C to quit)