flask debug
$ export FLASK_ENV=development
$ flask run
                                
                            flask debug
$ export FLASK_ENV=development
$ flask run
                                
                            flask how to run app
$ export FLASK_APP=hello.py
$ python -m flask run
 * Running on http://127.0.0.1:5000/
                                
                            flask debug
app.run(debug=True)
                                
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