python之logging模块

 

from http://blog.csdn.net/yatere/article/details/6655445

1.直接打印基本信息

import logging
logging.info('this is info message')
logging.debug('this is debug message')
logging.warning('this is warning message')

优先级CRITICAL > ERROR > WARNING > INFO > DEBUG > NOTSET

2.使用logging配置logging.basicConfig函数对日志的输出格式及方式做相关配置#logging,basicConfig参数：
 level:日志允许的最底级别

 format：输出内容和格式，有以下格式
 %(levelno)s: 打印日志级别的数值
 %(levelname)s: 打印日志级别名称
 %(pathname)s: 打印当前执行程序的路径，其实就是sys.argv[0]
 %(filename)s: 打印当前执行程序名
 %(funcName)s: 打印日志的当前函数
 %(lineno)d: 打印日志的当前行号
 %(asctime)s: 打印日志的时间
 %(thread)d: 打印线程ID
 %(threadName)s: 打印线程名称
 %(process)d: 打印进程ID
 %(message)s: 打印日志信息

 datefmt:时间格式
 filename:日志名称
 filemode: 日志打开模式 'w'或'a'
 stream: 指定将日志的输出流，可以指定输出到sys.stderr,sys.stdout或者文件，默认输出到sys.stderr，当stream和filename同时指定时，stream被忽略

import logging
 logging.basicConfig(level=logging.DEBUG, format='%(pathname)s %(filename)s %(asctime)s %(levelname)s %(message)s',
 datefmt='%a, %d %b %Y %H:%M:%S',
 filename ='myblog.log',
 filemode='w'
 )

logging.info('this is info message')
logging.debug('this is debug message')
logging.warning('this is warning message')

 在myblog.log中打印出来：
 test.py test.py Tue, 18 Jul 2017 14:43:18 INFO this is info message
 test.py test.py Tue, 18 Jul 2017 14:43:18 DEBUG this is debug message
 test.py test.py Tue, 18 Jul 2017 14:43:18 WARNING this is warning message

 3.将日志同时输出在文件和屏幕上

import logging
logging.basicConfig(level=logging.DEBUG, format='%(pathname)s %(filename)s %(asctime)s %(levelname)s %(message)s',
       datefmt='%a, %d %b %Y %H:%M:%S',
       filename ='myblog.log',
       filemode='w'
      )

# 定义一个StreamHandler,将INFO及以上打印到标准错误，并且添加到日志对象
console = logging.StreamHandler()
console.setLevel(logging.INFO)
formatter = logging.Formatter('%(name)-12s:%(levelname)-8s %(message)s')
console.setFormatter(formatter)
logging.getLogger('').addHandler(console)

4.logging日志回滚

import logging
# from logging.handlers import RotatingFileHandler

#################################################################################################
#定义一个RotatingFileHandler，最多备份5个日志文件，每个日志文件最大10M
Rthandler =RotatingFileHandler('myapp.log',maxBytes=10*1024*1024,backupCount=5)
Rthandler.setLevel(logging.INFO)
formatter = logging.Formatter('%(name)-12s: %(levelname)-8s %(message)s')
Rthandler.setFormatter(formatter)
logging.getLogger('').addHandler(Rthandler)
############################################

5.通过logging.config模块配置日志

#logger.conf
###############################################
[loggers]
keys=root,example01,example02
[logger_root]
level=DEBUG
handlers=hand01,hand02
[logger_example01]
handlers=hand01,hand02
qualname=example01
propagate=0
[logger_example02]
handlers=hand01,hand03
qualname=example02
propagate=0
###############################################
[handlers]
keys=hand01,hand02,hand03
[handler_hand01]
class=StreamHandler
level=INFO
formatter=form02
args=(sys.stderr,)
[handler_hand02]
class=FileHandler
level=DEBUG
formatter=form01
args=('myapp.log', 'a')
[handler_hand03]
class=handlers.RotatingFileHandler
level=INFO
formatter=form02
args=('myapp.log', 'a', 10*1024*1024, 5)
###############################################
[formatters]
keys=form01,form02
[formatter_form01]
format=%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s
datefmt=%a, %d %b %Y %H:%M:%S
[formatter_form02]
format=%(name)-12s: %(levelname)-8s %(message)s
datefmt=

　　

上例3：

import logging
import logging.config

logging.config.fileConfig("logger.conf")
logger = logging.getLogger("example01")

logger.debug('This is debug message')
logger.info('This is info message')
logger.warning('This is warning message')