经常使用的一个python logging封装，支持同时向console和文件输出

原文：http://www.cnblogs.com/Jerryshome/archive/2012/02/01/2334444.html

为了调试方便，特意将python的logging模块封装了一下，支持同时向console和file输出，支持日志文件回滚。

（1）myloggingconfig.py

# -*- coding: utf-8 -*-

'''
Created on 2011-8-24
主要用途：
对程序中所使用的loggong模式做一般性配置
@author: JerryKwan

'''

import logging

import logging.handlers

import os

LEVELS = {'NOSET': logging.NOTSET,
'DEBUG': logging.DEBUG,
'INFO': logging.INFO,
'WARNING': logging.WARNING,
'ERROR': logging.ERROR,
'CRITICAL': logging.CRITICAL}

#set up logging to file

#logging.basicConfig(level = logging.NOTSET,
#                    format = "%(asctime)s %(name)-12s %(levelname)-8s %(message)s"
#                    )

##                    filename = "./log.txt",

##                    filemode = "w")

# create logs file folder
logs_dir = os.path.join(os.path.curdir, "logs")
if os.path.exists(logs_dir) and os.path.isdir(logs_dir):
pass
else:
os.mkdir(logs_dir)

# define a rotating file handler
rotatingFileHandler = logging.handlers.RotatingFileHandler(filename ="./logs/log.txt",

maxBytes = 1024 * 1024 * 50,

backupCount = 5)

formatter = logging.Formatter("%(asctime)s %(name)-12s %(levelname)-8s %(message)s")

rotatingFileHandler.setFormatter(formatter)

logging.getLogger("").addHandler(rotatingFileHandler)

#define a handler whitch writes messages to sys

console = logging.StreamHandler()

console.setLevel(logging.NOTSET)

#set a format which is simple 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)

# set initial log level
logger = logging.getLogger("")
logger.setLevel(logging.NOTSET)

（2）具体使用方法

import logging

logger = logging.getLogger(__name__)

if __name__ == "__main__":

    import myloggingconfig

    msg = “this is just a test”

    logger.info(msg)

如果想动态更改logging的level，可以通过logging.getLogger("").setLevel(level)进行更改。