flask run development code example

Example 1: flask how to run app

$ export FLASK_APP=hello.py
$ python -m flask run
 * Running on http://127.0.0.1:5000/

Example 2: flask development mode

> set FLASK_APP=hello
> set FLASK_ENV=development
> flask run

Example 3: run flask app from script

# I am assuming that you have configured the app name as "app"

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