logging 模块

import logging

logging.basicConfig(filename='log.log',
                    format='%(asctime)s - %(name)s - %(levelname)s -%(module)s:  %(message)s',
                    datefmt='%Y-%m-%d %H:%M:%S %p',
                    level=logging.WARNING)

logging.debug('debug')
logging.info('info')
logging.warning('warning')
logging.error('error')
logging.critical('critical')
logging.log(10,'log')

日志等级：

CRITICAL = 50
FATAL = CRITICAL
ERROR = 40
WARNING = 30
WARN = WARNING
INFO = 20
DEBUG = 10
NOTSET = 0

Logger.exception(msg[, *args])

以ERROR级别记录日志消息，异常跟踪信息将被自动添加到日志消息里。Logger.exception通过用在异常处理块中，如：

import logging
import os
logging.basicConfig(format="%(levelname)s,%(message)s",filename=os.path.join(os.getcwd(),'log.txt'),level=logging.DEBUG)
log = logging.getLogger('root')   #Logger对象
try:
    raise Exception,u'错误异常'
except:
    log.exception('exception')  #异常信息被自动添加到日志消息中  
打开文件，显示如下：
'''ERROR,exception
Traceback (most recent call last):
  File "E:\project\py\src\log3.py", line 12, in <module>
    raise Exception,u'错误异常'
Exception: 错误异常
'''

　

例： 自定义错误类型并利用 logging 记录登录成功失败信息

import logging
from datetime import datetime

'''
try:
    pass
except 自定义错误类：
    logging.exception()

'''

logging.basicConfig(filename='log.log',
                    format='%(asctime)s - %(name)s - %(levelname)s -%(module)s:  %(message)s',
                    datefmt='%Y-%m-%d %H:%M:%S %p',
                    level=logging.INFO)

#自定义错误类
class login_sucess(Exception):
    pass

class login_fail(Exception):
    pass

def login():
    username = input('please input username:')
    passwd = input('please input passwd:')
    if username == 'yang' and passwd == '123':
        try:
            #主动抛出异常
            raise login_sucess('login sucess username: %s  time:%s'% (username, datetime.now()))
        #利用 logging 记录日志
        except Exception as e:
            logging.info(e)
        finally:
            print('welcome back!')
    else:
        try:
            raise login_sucess('login fail username: %s  time:%s' % (username, datetime.now()))
        except Exception as e:
            logging.error(e)
        finally:
            print('username or passwd is fail!')

if __name__ == '__main__':
    login()