Python: logging: Configure using a file

In all my previous posts, I defined loggers, handlers, and formatters explicitly using Python code. It is not always good approach. One better ways is create a logging config file and reading it using the fileConfig() function.

logging.conf

[loggers]
keys=root,simpleExample

[handlers]
keys=consoleHandler

[formatters]
keys=simpleFormatter

[logger_root]
level=DEBUG
handlers=consoleHandler

[logger_simpleExample]
level=DEBUG
handlers=consoleHandler
qualname=simpleExample
propagate=0

[handler_consoleHandler]
class=StreamHandler
level=DEBUG
formatter=simpleFormatter
args=(sys.stdout,)

[formatter_simpleFormatter]
format=%(asctime)s - %(name)s - %(levelname)s - %(message)s

import logging
import logging.config

logging.config.fileConfig('/Users/harikrishna_gurram/logging.conf')

# create logger
logger = logging.getLogger(__name__)

def logMessages():
    logger.debug('debug message')
    logger.info('info message')
    logger.warn('warn message')
    logger.error('error message')
    logger.critical('critical message')

if(__name__=="__main__"):
    logMessages()

Run above program, you will get following messages.

2015-10-24 13:50:46,807 - __main__ - DEBUG - debug message
2015-10-24 13:50:46,808 - __main__ - INFO - info message
2015-10-24 13:50:46,808 - __main__ - WARNING - warn message
2015-10-24 13:50:46,808 - __main__ - ERROR - error message
2015-10-24 13:50:46,808 - __main__ - CRITICAL - critical message

logging.config.fileConfig(fname, defaults=None, disable_existing_loggers=True)

‘fileConfig’ method reads configuration from configuration file. ‘disable_existing_loggers’ is enabled by default, so all the existing loggers before calling this function are disabled. To enable existing loggers set ‘disable_existing_loggers’ to false.

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