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1.简单的将日志打印到屏幕- import logging
- logging.debug('This is debug message')
- logging.info('This is info message')
- logging.warning('This is warning message')
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-
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- 屏幕上打印:
- WARNING:root:This is warning message
复制代码 默认情况下,logging将日志打印到屏幕,日志级别为WARNING;
日志级别大小关系为:CRITICAL > ERROR > WARNING > INFO > DEBUG > NOTSET,当然也可以自己定义日志级别。
2.通过logging.basicConfig函数对日志的输出格式及方式做相关配置- 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='myapp.log',
- filemode='w')
-
- logging.debug('This is debug message')
- logging.info('This is info message')
- logging.warning('This is warning message')
-
-
-
- ./myapp.log文件中内容为:
- Sun, 24 May 2009 21:48:54 demo2.py[line:11] DEBUG This is debug message
- Sun, 24 May 2009 21:48:54 demo2.py[line:12] INFO This is info message
- Sun, 24 May 2009 21:48:54 demo2.py[line:13] WARNING This is warning message
复制代码 logging.basicConfig函数各参数:
filename: 指定日志文件名
filemode: 和file函数意义相同,指定日志文件的打开模式,'w'或'a'
format: 指定输出的格式和内容,format可以输出很多有用信息,如上例所示:
%(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: 指定时间格式,同time.strftime()
level: 设置日志级别,默认为logging.WARNING
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
3.将日志同时输出到文件和屏幕- 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='myapp.log',
- filemode='w')
- #################################################################################################
- #定义一个StreamHandler,将INFO级别或更高的日志信息打印到标准错误,并将其添加到当前的日志处理对象#
- console = logging.StreamHandler()
- console.setLevel(logging.INFO)
- formatter = logging.Formatter('%(name)-12s: %(levelname)-8s %(message)s')
- console.setFormatter(formatter)
- logging.getLogger('').addHandler(console)
- #################################################################################################
- logging.debug('This is debug message')
- logging.info('This is info message')
- logging.warning('This is warning message')
-
-
-
- 屏幕上打印:
- root : INFO This is info message
- root : WARNING This is warning message
-
- ./myapp.log文件中内容为:
- Sun, 24 May 2009 21:48:54 demo2.py[line:11] DEBUG This is debug message
- Sun, 24 May 2009 21:48:54 demo2.py[line:12] INFO This is info message
- Sun, 24 May 2009 21:48:54 demo2.py[line:13] WARNING This is warning message
复制代码 4.logging之日志回滚- 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)
- ################################################################################################
复制代码 从上例和本例可以看出,logging有一个日志处理的主对象,其它处理方式都是通过addHandler添加进去的。
logging的几种handle方式如下:
logging.StreamHandler: 日志输出到流,可以是sys.stderr、sys.stdout或者文件 logging.FileHandler: 日志输出到文件
日志回滚方式,实际使用时用RotatingFileHandler和TimedRotatingFileHandler logging.handlers.BaseRotatingHandler logging.handlers.RotatingFileHandler logging.handlers.TimedRotatingFileHandler
logging.handlers.SocketHandler: 远程输出日志到TCP/IP sockets
logging.handlers.DatagramHandler: 远程输出日志到UDP sockets
logging.handlers.SMTPHandler: 远程输出日志到邮件地址
logging.handlers.SysLogHandler: 日志输出到syslog
logging.handlers.NTEventLogHandler: 远程输出日志到Windows NT/2000/XP的事件日志
logging.handlers.MemoryHandler: 日志输出到内存中的制定buffer
logging.handlers.HTTPHandler: 通过"GET"或"POST"远程输出到HTTP服务器
由于StreamHandler和FileHandler是常用的日志处理方式,所以直接包含在logging模块中,而其他方式则包含在logging.handlers模块中,
上述其它处理方式的使用请参见python2.5手册!
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=
复制代码- 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')
复制代码- import logging
- import logging.config
- logging.config.fileConfig("logger.conf")
- logger = logging.getLogger("example02")
- logger.debug('This is debug message')
- logger.info('This is info message')
- logger.warning('This is warning message')
复制代码 6.logging是线程安全的
from:http://blog.csdn.net/yatere/article/details/6655445 |
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