Correct way to work with the `logging` module in Python

Question

I'm trying to add logs to my code instead of printing everything. I read a bunch of other posts and articles, such as the ones listed here, but the logs in my code do not print.

Here's an example:

# driver.py import logging logger = logging.getLogger(__name__) logger.setLevel(logging.DEBUG) def main(): logging.debug('This is a simple log') # other code here if __name__ == "__main__": main()

But my log does not print to stdout. What am I doing wrong?

Also, if I want to add logging to multiple files, can I configure the log on a separate file, import that file on my driver.py and helper_funtions.py for example, so I don't have to repeat the same thing over and over?

Add logging.basicConfig() before any other logger config!

Klaus D.
– Klaus D.

2019-07-09 14:52:38 +00:00
Commented Jul 9, 2019 at 14:52 — Klaus D.
– Klaus D., Commented Jul 9, 2019 at 14:52

drewa · Accepted Answer · 2019-07-09 14:56:51Z

You need a StreamHandler

ch = logging.StreamHandler() logger.add_handler(ch)

The logging cookbook provides plenty of examples on setting up streamhandlers as well as logging to a file. You can even configure the format of the logs to StdOut look different that that of the the file.

https://docs.python.org/3/howto/logging-cookbook.html#logging-cookbook

not necessary. It worked by adding the logging.basicConfig() that @Klaus suggested

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