How to add a custom loglevel to Python's logging facility

Question

I\'d like to have loglevel TRACE (5) for my application, as I don\'t think that debug() is sufficient. Additionally log(5, msg) isn\'t what I want.

Answer 1

While we have already plenty of correct answers, the following is in my opinion more pythonic:

import logging

from functools import partial, partialmethod

logging.TRACE = 5
logging.addLevelName(logging.TRACE, 'TRACE')
logging.Logger.trace = partialmethod(logging.Logger.log, logging.TRACE)
logging.trace = partial(logging.log, logging.TRACE)

If you want to use mypy on your code, it is recommended to add # type: ignore to suppress warnings from adding attribute.