Env. Variables not set while running Minimal Flask application

Question

I am trying to follow the flask documentation on my windows machine given at the following link: http://flask.pocoo.org/docs/0.11/quickstart/#debug-mode

Firstly I wrote

Answer 1

You have to set the FLASK_APP variable outside of the virtual environment. I'm assuming the reason that it worked after @Fang restarted the command window is because that action automatically exited the virtual environment.

So, if you're in the virtual environment (indicated by a (venv) at the start of line on command window), then type the following commands:

deactivate

set FLASK_APP=run.py

venv\scripts\activate

flask run