Python Module logging Concepts
Internal
Logging Levels
The logging system can be configured to filter out log messages whose logging level is under a certain threshold. The logging levels, and the corresponding logging functions are, listed from the most important to the least important:
CRITICAL
Generated with logging.critical().
ERROR
Generated with logging.error().
WARNING
Generated with logging.warning().
INFO
Generated with logging.info().
DEBUG
Generated with logging.debug().
Logger
Logger Hierarchy
If the logger name contains dot characters, they separate levels of a hierarchy. Closer to the left, the higher the logger in the logger hierarchy: a has a higher level than a.b . Each level in the hierarchy can be given different properties. At the top of the hierarchy there's a root logger.
The root Logger
At the top of the logger hierarchy, there is a special root logger, called .
Format
The default format, without any customization is <LOGGING_LEVEL>:<logger_name>:<message>.