python : logging模块format类

参考资料：

http://blog.csdn.net/chosen0ne/article/details/7319306

例子：

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import logging  
import logging.handlers 
  
LOG_FILE = 'tst.log'
  
handler = logging.handlers.RotatingFileHandler(LOG_FILE, maxBytes = 1024*1024, backupCount = 5) # 实例化handler   
fmt = '[%(asctime)s] [%(levelname)s] [ %(filename)s:%(lineno)s - %(name)s ] %(message)s '  
  
formatter = logging.Formatter(fmt)   # 实例化formatter  
handler.setFormatter(formatter)      # 为handler添加formatter  
  
logger = logging.getLogger('tst')    # 获取名为tst的logger  
logger.addHandler(handler)           # 为logger添加handler  
logger.setLevel(logging.DEBUG)  
  
logger.info('first info message')  
logger.debug('first debug message')  

格式字符串

Format	Description
%(name)s	Name of the logger (logging channel).
%(levelno)s	Numeric logging level for the message (DEBUG, INFO, WARNING, ERROR, CRITICAL).
%(levelname)s	Text logging level for the message ('DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL').
%(pathname)s	Full pathname of the source file where the logging call was issued (if available).
%(filename)s	Filename portion of pathname.
%(module)s	Module (name portion of filename).
%(funcName)s	Name of function containing the logging call.
%(lineno)d	Source line number where the logging call was issued (if available).
%(created)f	Time when the LogRecord was created (as returned by time.time()).
%(relativeCreated)d	Time in milliseconds when the LogRecord was created, relative to the time the logging module was loaded.
%(asctime)s	Human-readable time when the LogRecord was created. By default this is of the form “2003-07-08 16:49:45,896” (the numbers after the comma are millisecond portion of the time).
%(msecs)d	Millisecond portion of the time when the LogRecord was created.
%(thread)d	Thread ID (if available).
%(threadName)s	Thread name (if available).
%(process)d	Process ID (if available).
%(message)s	The logged message, computed as msg % args.