Python3 & PyCharm - Debug logging levels in run/debug

Question

I'm just starting with PyCharm, is there a way to show debug & info warnings?

import logging logger = logging.getLogger('tipper') logger.setLevel(logging.DEBUG) logger.debug('debug message') logger.info('info message') logger.warn('warn message') logger.error('error message') logger.critical('critical message') 

warn, error, critical all show:

/home/username/someproject/.someprojectenv/bin/python3/home/username/someproject/go.py warn message error message critical message  Process finished with exit code 0 

However debug, info do not show.

Answer 1

The problem has nothing to do with PyCharm, but with how logging configuration works. If you try to write the code you have shown in a normal python interactive session you get the same output:

>>> import logging >>> logger = logging.getLogger('tipper') >>> logger.setLevel(logging.DEBUG) >>> logger.debug('debug message') >>> logger.info('info message') >>> logger.warn('warn message') warn message >>> logger.error('error message') error message >>> logger.critical('critical message') critical message 

The problem is that setting the logger's level isn't enough! You must also add a handler to the logger otherwise the logger will simply forward the message up the chain. The messages will end up at the root logger, which has, by default, a level of logging.WARN and thus discards DEBUG level messages.

However if you add a handler to logger all works fine:

>>> logger.addHandler(logging.StreamHandler()) >>> logger.debug('test') test 

You can set more than one handler for each logger and each handler can have a different logging level.

See this question for a bit of further information about logger's and handler's levels. I'd suggest also to read carefully the documentation for the logging module and the various guides (e.g. the logging How-To, because it has a really advanced configuration.

Also from python3.2 there's a dictConfig function which allow you to specify the configuration for your logging hierarchy as dictionary, without having to manually create every handler and logger by hand.