Why python's logging module stopped working suddenly?

Question

For years I have been working with python and running massive data processes that run for hours or days. So logging for me is critical. I have been using logging module for a long time with no issues except today; a process that I need to run stopped writing the log file.

If a run the next code, nothing goes to the log file:

import logging

_log_file_name = "LOGGER_TEST.log"
logging.basicConfig(filename=_log_file_name, format="%(asctime)s %(levelname)s:%(message)s",
                            level=logging.INFO)

logging.info("HELLO")
logging.info("BYE")

what Am I doing wrong?

I'm running this code from Jupyter And my process I'm running it from PyCharm and from Ubuntu, not even writing the log file from any of them.

Thanks!!

Answer 1

I assume either some module or jupyter notebook (ipython) is calling the logging.basicConfig before your script is calling it. Subsequent calls to basicConfig() has no effect and does not throw any error. To quote from official docs:

The call to basicConfig() should come before any calls to debug(), info() etc. As it’s intended as a one-off simple configuration facility, only the first call will actually do anything: subsequent calls are effectively no-ops.

So try to import logging and configuring logging at the start of the script