python logging模块用法

http://blog.csdn.net/zyz511919766/article/details/25136485/

import logging
logging.debug('debug message')
logging.info('info message')
logging.warning('warning message')
logging.error('error message')
logging.critical('critical message')  

这种，直接将log信息打开在屏幕上，而且只打印 warning及以上的信息，

日志级别等级CRITICAL > ERROR > WARNING > INFO > DEBUG > NOTSET

import logging  

logging.basicConfig(level=logging.DEBUG,
                    format='%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s',
                    datefmt='%a, %d %b %Y %H:%M:%S',
                    filename='E:/tmp/test.log',
                    filemode='w')
logging.debug('debug message')
logging.info('info message')
logging.warning('warning message')
logging.error('error message')
logging.critical('critical message')  

这种 ，将日志输出到test.log中，

另外 还可以创建一个logging的实例 logger

#coding:utf-
import logging  

# 创建一个logger
logger = logging.getLogger()  

logger1 = logging.getLogger('mylogger')
logger1.setLevel(logging.DEBUG)  

logger2 = logging.getLogger('mylogger')
logger2.setLevel(logging.INFO)  

logger3 = logging.getLogger('mylogger.child1')
logger3.setLevel(logging.WARNING)  

logger4 = logging.getLogger('mylogger.child1.child2')
logger4.setLevel(logging.DEBUG)  

logger5 = logging.getLogger('mylogger.child1.child2.child3')
logger5.setLevel(logging.DEBUG)  

# 创建一个handler，用于写入日志文件
fh = logging.FileHandler('/tmp/test.log')  

# 再创建一个handler，用于输出到控制台
ch = logging.StreamHandler()  

# 定义handler的输出格式formatter
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
fh.setFormatter(formatter)
ch.setFormatter(formatter)  

#定义一个filter
#filter = logging.Filter('mylogger.child1.child2')
#fh.addFilter(filter)    

# 给logger添加handler
#logger.addFilter(filter)
logger.addHandler(fh)
logger.addHandler(ch)  

#logger1.addFilter(filter)
logger1.addHandler(fh)
logger1.addHandler(ch)  

logger2.addHandler(fh)
logger2.addHandler(ch)  

#logger3.addFilter(filter)
logger3.addHandler(fh)
logger3.addHandler(ch)  

#logger4.addFilter(filter)
logger4.addHandler(fh)
logger4.addHandler(ch)  

logger5.addHandler(fh)
logger5.addHandler(ch)  

# 记录一条日志
logger.debug('logger debug message')
logger.info('logger info message')
logger.warning('logger warning message')
logger.error('logger error message')
logger.critical('logger critical message')  

logger1.debug('logger1 debug message')
logger1.info('logger1 info message')
logger1.warning('logger1 warning message')
logger1.error('logger1 error message')
logger1.critical('logger1 critical message')  

logger2.debug('logger2 debug message')
logger2.info('logger2 info message')
logger2.warning('logger2 warning message')
logger2.error('logger2 error message')
logger2.critical('logger2 critical message')  

logger3.debug('logger3 debug message')
logger3.info('logger3 info message')
logger3.warning('logger3 warning message')
logger3.error('logger3 error message')
logger3.critical('logger3 critical message')  

logger4.debug('logger4 debug message')
logger4.info('logger4 info message')
logger4.warning('logger4 warning message')
logger4.error('logger4 error message')
logger4.critical('logger4 critical message')  

logger5.debug('logger5 debug message')
logger5.info('logger5 info message')
logger5.warning('logger5 warning message')
logger5.error('logger5 error message')
logger5.critical('logger5 critical message')  

并绑定两个事件，分别输出的控制台和文件内