How to list all existing loggers using python.logging module

Question

Is there a way in Python to get a list of all defined loggers?

I mean, does something exist such as logging.getAllLoggers() which would return a list of Logger objects?

I searched the python.logging documentation but couldn't find such a method.

Thank you in advance.

Solution 1

Loggers are held in a hierarchy by a logging.Manager instance. You can interrogate the manager on the root logger for the loggers it knows about.

import logging

loggers = [logging.getLogger(name) for name in logging.root.manager.loggerDict]

Calling getLogger(name) ensures that any placeholder loggers held by loggerDict are fully initialized when they are added to the list.

Solution 2

If you want to include RootLogger in the list as well, do something similar to:

import logging
loggers = [logging.getLogger()]  # get the root logger
loggers = loggers + [logging.getLogger(name) for name in logging.root.manager.loggerDict]

tested on Python 3.7.4

Comments

[mistiru]

In fact, getting the dict of Logger per name is better than simply a list of Logger alone, so logging.root.manager.loggerDict was exactly what I was searching for, thank you!

[Dimitar Ivanov]

A small note here is that root logger is not returned by this snippet.

[Matt-Mac-Muffin]

Anyone has an explanation about why PyCharm's linting warns about this snippet: Unresolved attribute reference 'manager' for class 'RootLogger'? I know it can be easily disabled, but still...

[mistiru]

I would have preferred to do it without depending on a third party library, but thank you for the link :)