Example of using the Python logging library.

logging.conf

[loggers]
keys=root

[handlers]
keys=consoleHandler,fileHandler

[formatters]
keys=simpleFormatter

[logger_root]
level=NOTSET
handlers=fileHandler

[handler_fileHandler]
class=FileHandler
level=DEBUG
formatter=simpleFormatter
args=("log/debug.log", "a")

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

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

program.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import logging, logging.config
logging.config.fileConfig( "config/logging.conf" )
logger = logging.getLogger( __name__ )

# ... rest of the program