Flask Framework Cookbook - Second Edition

How to do it...

To run our application in the debug mode, for instance, we can write the following:

app = Flask(__name__) 
app.config['DEBUG'] = True 

The debug Boolean can also be set at the Flask object level rather than at the config level, as follows: app.debug = True Alternatively, we can pass debug as a named argument to app.run, as follows: app.run(debug=True) In new versions of Flask, the debug mode can also set on an environment variable, FLASK_DEBUG=1, and then run the app using flask run or Python's -m switch: $ export FLASK_DEBUG=1 Enabling the debug mode will make the server reload itself in the event of any code changes, and it also provides the very helpful Werkzeug debugger when something goes wrong.

There are a bunch of configuration ...