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')