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Easier loggers traversal tree with a logger.getChildren method #89258
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sblondon commented
on Sep 3, 2021 sblondonmannequinMannequinAuthorCurrently, logging.root.manager.loggerDict is usable to do a homemade traversal of the loggers tree. However, it's not a public interface. Adding a 'logger.getChildren()' method would help to implement the traversal. The method would return a set of loggers.
Usage example: >>> import logging >>> logging.basicConfig(level=logging.CRITICAL) >>> root_logger = logging.getLogger() <RootLogger root (CRITICAL)> >>> root_logger.getChildren() set() >>> a_logger = logging.getLogger("a") >>> root_logger.getChildren() {<Logger a. (CRITICAL)>} >>> logging.getLogger('a.b').setLevel(logging.DEBUG) >>> _ = logging.getLogger('a.c') >>> a_logger.getChildren() {<Logger a.c (CRITICAL)>, <Logger a.b (DEBUG)>}
With such method, traverse the tree will be obvious to write with a recursive function.
Use cases:
- to check all the loggers are setted up correctly. I wrote a small function to get all loggers, and log on every level to check the real behaviour.
- to draw the loggers tree like logging_tree library (https://pypi.org/project/logging_tree/). I didn't ask to logging_tree's maintainer but I don't think he would use such function because the library works for huge range of python releases.
I plan to write a PR if someone thinks it's a good idea.
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