How to print current logging configuration used by the python logging module?

Question

I'm using the python logging module.

I update the logging config using logging.dictConfig().

I would like a way to read the current configuration (e.g. level) used by each logger and print it.

How can I get and print this information?

Answer 1

From Simeon's comment, the logging_tree package lets you print out the details of the current logging configuration.

>>> import logging >>> logging.getLogger('a') >>> logging.getLogger('a.b').setLevel(logging.DEBUG) >>> logging.getLogger('x.c') >>> from logging_tree import printout >>> printout() <--""    Level WARNING    |    o<--"a"    |   Level NOTSET so inherits level WARNING    |   |    |   o<--"a.b"    |       Level DEBUG    |    o<--[x]        |        o<--"x.c"            Level NOTSET so inherits level WARNING >>> # Get the same display as a string: >>> from logging_tree.format import build_description >>> print(build_description()[:50]) <--""    Level WARNING    |    o<--"a"    |   Leve 

Answer 2

Logging configuration are stored in logging.root.manager.

From there you can access every logging parameters, example : logging.root.manager.root.level to get the logging level of your root logger.

Any other loggers can be accessed through logging.root.manager.loggerDict['logger_name'].

Here is an example on how to get the formatter used by a custom logger:

>>> import logging >>> import logging.config >>> config = {"version": 1, ...     "formatters": { ...         "detailed": { ...             "class": "logging.Formatter", ...             "format": "%(asctime)s %(name)-15s %(levelname)-8s %(processName)-10s %(message)s"}}, ...     "handlers": { ...         "console": { ...             "class": "logging.StreamHandler", ...             "level": "WARNING"}, ...         "file": { ...             "class": "logging.FileHandler", ...             "filename": "mplog.log", ...             "mode": "a", ...             "formatter": "detailed"}, ...         "foofile": { ...             "class": "logging.handlers.RotatingFileHandler", ...             "filename": "mplog-foo.log", ...             "mode": "a", ...             "formatter": "detailed", ...             "maxBytes": 20000, ...             "backupCount": 20}}, ...     "loggers": { ...         "foo": { ...             "handlers": ["foofile"]}}, ...     "root": { ...         "level": "DEBUG", ...         "handlers": ["console", "file"]}} >>> logging.config.dictConfig(config) >>> logging.root.manager.loggerDict['foo'].handlers[0].formatter._fmt '%(asctime)s %(name)-15s %(levelname)-8s %(processName)-10s %(message)s' 

Handlers parameters can also be found in logging._handlers.data.

>>> logging._handlers.data['file']().__dict__  {'baseFilename': '/File/Path/mplog.log',   'mode': 'a',   'encoding': None,   'delay': False,   'filters': [],   '_name': 'file',   'level': 0,   'formatter': <logging.Formatter object at 0x7ff13a3d6df0>,   'lock': <unlocked _thread.RLock object owner=0 count=0 at 0x7ff13a5b7510>,   'stream': <_io.TextIOWrapper name='/File/Path/mplog.log' mode='a' encoding='UTF-8'>}