The documentation only specifies
if __name__ == '__main__':
app.run_server(debug=True)
However, this would cause problems on the deployment of the app to heroku, the correct code should include the heroku port variable
if __name__ == '__main__':
app.run_server(debug=False, port=PORT)
The documentation only specifies
However, this would cause problems on the deployment of the app to heroku, the correct code should include the heroku port variable