How to turn on logs in Flask app

Question

Testing a flask-SocketIO app and I can't see any logs. It crashes but it doesn't write anything in my Konsole. What I only see is:

 ~/PycharmProjects/chat $ flask run
 * Serving Flask-SocketIO app "main.py"
 * Forcing debug mode off

Is it connected with Socket-IO library? Other Flask applications work normally and everything is shown in console.

score 2 · Accepted Answer · answered Aug 11 '18 at 01:58

2

you need to set debug to True. Do this:

export FLASK_APP=main.py
export FLASK_DEBUG=1
flask run

Now you will be able to see the verbose debug in your console.

answered Aug 11 '18 at 01:58

user2906838

I did it and I still can't see the traceback messages. It looks like this: * Serving Flask-SocketIO app "main.py" * Forcing debug mode on * Restarting with stat * Debugger is active! * Debugger PIN: 399-480-796 127.0.0.1 - - [2018-08-12 04:55:32] "POST / HTTP/1.1" 405 323 0.001283 127.0.0.1 - - [2018-08-12 04:55:51] "POST / HTTP/1.1" 405 323 0.001800 – Desiigner Aug 12 '18 at 01:57
these lines are shown when an error occurs – Desiigner Aug 12 '18 at 01:57
Yes, this is what you would see, the sever is returning 405 response code. If there was something in the code, it would show up. – user2906838 Aug 12 '18 at 02:01

score 2 · Answer 2 · answered Aug 11 '18 at 02:55

2

In the terminal, type export FLASK_ENV=development

The development mode on Flask enables logging functionality and also a lot of developer helpful tools.

answered Aug 11 '18 at 02:55

Victor Moraes

2 Answers2