https://docs.python.org/3/howto/logging.html#logging-basic-tutorial
更多更好的例子：
https://docs.python.org/3/howto/logging-cookbook.html#logging-cookbook
import logging # set up logging to file - see previous section for more details logging.basicConfig(level=logging.DEBUG, format=‘%(asctime)s %(name)-12s %(levelname)-8s %(message)s‘, datefmt=‘%m-%d %H:%M‘, filename=‘/temp/myapp.log‘, filemode=‘w‘) # define a Handler which writes INFO messages or higher to the sys.stderr console = logging.StreamHandler() console.setLevel(logging.INFO) # set a format which is simpler for console use formatter = logging.Formatter(‘%(name)-12s: %(levelname)-8s %(message)s‘) # tell the handler to use this format console.setFormatter(formatter) # add the handler to the root logger logging.getLogger(‘‘).addHandler(console) # Now, we can log to the root logger, or any other logger. First the root... logging.info(‘Jackdaws love my big sphinx of quartz.‘) # Now, define a couple of other loggers which might represent areas in your # application: logger1 = logging.getLogger(‘myapp.area1‘) logger2 = logging.getLogger(‘myapp.area2‘) logger1.debug(‘Quick zephyrs blow, vexing daft Jim.‘) logger1.info(‘How quickly daft jumping zebras vex.‘) logger2.warning(‘Jail zesty vixen who grabbed pay from quack.‘) logger2.error(‘The five boxing wizards jump quickly.‘)
When you run this, on the console you will see
root : INFO Jackdaws love my big sphinx of quartz.
myapp.area1 : INFO How quickly daft jumping zebras vex.
myapp.area2 : WARNING Jail zesty vixen who grabbed pay from quack.
myapp.area2 : ERROR The five boxing wizards jump quickly.
and in the file you will see something like
10-22 22:19 root INFO Jackdaws love my big sphinx of quartz. 10-22 22:19 myapp.area1 DEBUG Quick zephyrs blow, vexing daft Jim. 10-22 22:19 myapp.area1 INFO How quickly daft jumping zebras vex. 10-22 22:19 myapp.area2 WARNING Jail zesty vixen who grabbed pay from quack. 10-22 22:19 myapp.area2 ERROR The five boxing wizards jump quickly.
原文：http://www.cnblogs.com/snow-backup/p/4156908.html