how to run a flask application 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: export flask app
> set FLASK_APP=hello
> flask run$ export FLASK_APP=hello.py
$ python -m flask run
* Running on http://127.0.0.1:5000/> set FLASK_APP=hello
> flask run