日志一共分成5個(gè)等級(jí)，從低到高分別是：DEBUG INFO WARNING ERROR CRITICAL。DEBUG：詳細(xì)的信息,通常只出現(xiàn)在診斷問(wèn)題上INFO：確認(rèn)一切按預(yù)期運(yùn)行WARNING：一個(gè)跡象表明,一些意想不到的事情發(fā)生了,或表明一些問(wèn)題在不久的將來(lái)(例如。磁盤(pán)空間低”)。這個(gè)軟件還能按預(yù)期工作。ERROR：更嚴(yán)重的問(wèn)題,軟件沒(méi)能執(zhí)行一些功能CRITICAL：一個(gè)嚴(yán)重的錯(cuò)誤,這表明程序本身可能無(wú)法繼續(xù)運(yùn)行這5個(gè)等級(jí)，也分別對(duì)應(yīng)5種打日志的方法： debug 、info 、warning 、error 、critical。默認(rèn)的是WARNING，當(dāng)在WARNING或之上時(shí)才被跟蹤。

logging.basicConfig函數(shù)中，可以指定日志的輸出格式format，這個(gè)參數(shù)可以輸出很多有用的信息，如上例所示：%(levelno)s: 打印日志級(jí)別的數(shù)值%(levelname)s: 打印日志級(jí)別名稱%(pathname)s: 打印當(dāng)前執(zhí)行程序的路徑，其實(shí)就是sys.argv[0]%(filename)s: 打印當(dāng)前執(zhí)行程序名%(funcName)s: 打印日志的當(dāng)前函數(shù)%(lineno)d: 打印日志的當(dāng)前行號(hào)%(asctime)s: 打印日志的時(shí)間%(thread)d: 打印線程ID%(threadName)s: 打印線程名稱%(process)d: 打印進(jìn)程ID%(message)s: 打印日志信息我在工作中給的常用格式在前面已經(jīng)看到了。就是：format='%(asctime)s - %(filename)s[line:%(lineno)d] - %(levelname)s: %(message)s'這個(gè)格式可以輸出日志的打印時(shí)間，是哪個(gè)模塊輸出的，輸出的日志級(jí)別是什么，以及輸入的日志內(nèi)容。

import logging logging.basicConfig(level=logging.WARNING,           format='%(asctime)s - %(filename)s[line:%(lineno)d] - %(levelname)s: %(message)s') # use logging logging.info('this is a loggging info message') logging.debug('this is a loggging debug message') logging.warning('this is loggging a warning message') logging.error('this is an loggging error message') logging.critical('this is a loggging critical message') 執(zhí)行上面的代碼將在Console中輸出下面信息：2017-03-16 16:58:11,266 - a.py[line:10] - WARNING: this is loggging a warning message2017-03-16 16:58:11,266 - a.py[line:11] - ERROR: this is an loggging error message2017-03-16 16:58:11,266 - a.py[line:12] - CRITICAL: this is a loggging critical message

import logging logging.basicConfig(level=logging.WARNING,           filename='./log/log.txt',           filemode='w',           format='%(asctime)s - %(filename)s[line:%(lineno)d] - %(levelname)s: %(message)s') # use logging logging.info('this is a loggging info message') logging.debug('this is a loggging debug message') logging.warning('this is loggging a warning message') logging.error('this is an loggging error message') logging.critical('this is a loggging critical message') 運(yùn)行之后，打開(kāi)該文件./log/log.txt，效果如下：2015-05-21 17:30:20,282 - log.py[line:12] - WARNING: this is loggging a warning message2015-05-21 17:30:20,282 - log.py[line:13] - ERROR: this is an loggging error message2015-05-21 17:30:20,282 - log.py[line:14] - CRITICAL: this is a loggging critical message

#config.conf###############################################[loggers]keys=root,example01,example02[logger_root]level=DEBUGhandlers=hand01,hand02[logger_example01]handlers=hand01,hand02qualname=example01propagate=0[logger_example02]handlers=hand01,hand03qualname=example02propagate=0###############################################[handlers]keys=hand01,hand02,hand03[handler_hand01]class=StreamHandlerlevel=INFOformatter=form02args=(sys.stderr,)[handler_hand02]class=FileHandlerlevel=NOTSETformatter=form01args=('myapp.log', 'a')[handler_hand03]class=handlers.RotatingFileHandlerlevel=INFOformatter=form02args=('myapp.log', 'a', 10*1024*1024, 5)###############################################[formatters]keys=form01,form02[formatter_form01]format=%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)sdatefmt=%a, %d %b %Y %H:%M:%S[formatter_form02]format=%(name)-12s: %(levelname)-8s %(message)sdatefmt=

import loggingimport logging.configlogging.config.fileConfig("/home/razerware/configscript/config.conf")logger = logging.getLogger("example01")logger2 = logging.getLogger("example02")logger.debug('This is debug message')logger.info('This is info message')logger.warning('This is warning message')logger2.debug('This is debug message')logger2.info('This is info message')logger2.warning('This is warning message')