logging.exception

By skimming Python documentation today, I realized that logging module provides an exception level. Its goal is to show you a stacktrace when you call it from an except block.

You may have noticed that if you log an exception with level error, you only get exception message:

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import logging

def send_unexpected_exception():
    raise Exception("I did not expect this")

logging.basicConfig(level=logging.DEBUG)

try:
    send_unexpected_exception()
except Exception as e:
    logging.error(e)

Returns:

ERROR:root:I did not expect this

Now use exception level:

It returns:

ERROR:root:I did not expect this
Traceback (most recent call last):
  File "logging_exception.py", line 12, in <module>
    send_unexpected_exception()
  File "logging_exception.py", line 7, in send_unexpected_exception
    raise Exception("I did not expect this")
Exception: I did not expect this

I think it’s an interesting way to provide feedback and context if your app raises an unexpected exception.