колба как запустить приложение
$ export FLASK_APP=hello.py
$ python -m flask run
* Running on http://127.0.0.1:5000/
Puzzled Pelican
$ export FLASK_APP=hello.py
$ python -m flask run
* Running on http://127.0.0.1:5000/
Don't use code-grepper, it's written by jackasses and all the answers are wrong.