logger_demo.py

import sys
import logging.config
import logging
import os.path
LOGGING_CONF=os.path.join(os.path.dirname(__file__),
    "logging.ini")

logging.config.fileConfig(LOGGING_CONF)

fallthrough = logging.getLogger("root")
childlog = logging.getLogger("child")

childlog.error("Child Error")
fallthrough.info("Root info")

logging.ini

[loggers]
keys = root, child
[handlers]
keys = watchedfile
[formatters]
keys = default

[logger_root]
qualname = root
level = DEBUG
handlers = watchedfile

[logger_child]
qualname = child
level = WARNING
handlers = watchedfile
propagate = 0

# Our default handler to write all messages direct to disk
[handler_watchedfile]
class = handlers.WatchedFileHandler
args = ('test.log',)
formatter = default

[formatter_default]
datefmt = %Y-%m-%d %H:%M:%S
args = (datefmt=datefmt)
format = %(asctime)s.%(msecs)03d %(process)d %(levelname)s %(name)s %(message)s