python中内置的logging模块使用示例

py_logging_example.py

# 基础用法
import os 
import logging
if __name__  == '__main__':
    logging.basicConfig(filename='example.log',format='%(asctime)s  %(process)s  %(module)s  %(message)s',level=logging.DEBUG)
    logging.debug('This message should go to the log file')
    logging.info('So should this')
    logging.warning('And this, too')
    logging.warning('Watch out!')  # will print a message to the console
    logging.info('I told you so')  # will not print anything
    logging.error('oops')
#===================================================================================================================================#
#===================================================================================================================================#   
# 实用代码, 同时输出到文件和屏幕. 可以在多个模块中logging
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='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.')