1 import logging
2 
3 logging.debug('This is debug message---by liu-ke')
4 logging.info('This is info message---by liu-ke')
5 logging.warning('This is warning message---by liu-ke')

 1 import logging
 2 
 3 logging.basicConfig(level=logging.DEBUG,
 4                 format='%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s',
 5                 datefmt='%a, %d %b %Y %H:%M:%S',
 6                 filename='mypy.log',
 7                 filemode='w')
 8     
 9 logging.debug('This is debug message by liu-ke')
10 logging.info('This is info message by liu-ke')
11 logging.warning('This is warning message by liu-ke')

 1 logging.basicConfig函数各参数:
 2 filename: 指定日志文件名
 3 filemode: 和file函数意义相同，指定日志文件的打开模式，'w'或'a'
 4 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:
 5  %(levelno)s: 打印日志级别的数值
 6  %(levelname)s: 打印日志级别名称
 7  %(pathname)s: 打印当前执行程序的路径，其实就是sys.argv[0]
 8  %(filename)s: 打印当前执行程序名
 9  %(funcName)s: 打印日志的当前函数
10  %(lineno)d: 打印日志的当前行号
11  %(asctime)s: 打印日志的时间
12  %(thread)d: 打印线程ID
13  %(threadName)s: 打印线程名称
14  %(process)d: 打印进程ID
15  %(message)s: 打印日志信息
16 datefmt: 指定时间格式，同time.strftime()
17 level: 设置日志级别，默认为logging.WARNING
18 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

 1 import logging
 2 
 3 logging.basicConfig(level=logging.DEBUG,
 4                 format='%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s',
 5                 datefmt='%a, %d %b %Y %H:%M:%S',
 6                 filename='mypy.log',
 7                 filemode='w')
 8 
 9 #################################################################################################
10 #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#
11 console = logging.StreamHandler()
12 console.setLevel(logging.INFO)
13 formatter = logging.Formatter('%(name)-12s: %(levelname)-8s %(message)s')
14 console.setFormatter(formatter)
15 logging.getLogger('').addHandler(console)
16 #################################################################################################
17 
18 logging.debug('This is debug message')
19 logging.info('This is info message')
20 logging.warning('This is warning message')

 1 import logging
 2 from logging.handlers import RotatingFileHandler
 3 
 4 #################################################################################################
 5 #定义一个RotatingFileHandler，最多备份5个日志文件，每个日志文件最大10M(自定义)
 6 Rthandler = RotatingFileHandler('myapp.log', maxBytes=10*1024*1024,backupCount=5)
 7 Rthandler.setLevel(logging.INFO)
 8 formatter = logging.Formatter('%(name)-12s: %(levelname)-8s %(message)s')
 9 Rthandler.setFormatter(formatter)
10 logging.getLogger('').addHandler(Rthandler)
11 ###########################################################################################

 1 logging.StreamHandler: 日志输出到流，可以是sys.stderr、sys.stdout或者文件
 2 logging.FileHandler: 日志输出到文件
 3 日志回滚方式，实际使用时用RotatingFileHandler和TimedRotatingFileHandler
 4 logging.handlers.BaseRotatingHandler
 5 logging.handlers.RotatingFileHandler
 6 logging.handlers.TimedRotatingFileHandler
 7 logging.handlers.SocketHandler: 远程输出日志到TCP/IP sockets
 8 logging.handlers.DatagramHandler:  远程输出日志到UDP sockets
 9 logging.handlers.SMTPHandler:  远程输出日志到邮件地址
10 logging.handlers.SysLogHandler: 日志输出到syslog
11 logging.handlers.NTEventLogHandler: 远程输出日志到Windows NT/2000/XP的事件日志
12 logging.handlers.MemoryHandler: 日志输出到内存中的制定buffer
13 logging.handlers.HTTPHandler: 通过"GET"或"POST"远程输出到HTTP服务器

 1 #logger.conf
 2 ###############################################
 3 [loggers]
 4 keys=root,example01,example02
 5 [logger_root]
 6 level=DEBUG
 7 handlers=hand01,hand02
 8 [logger_example01]
 9 handlers=hand01,hand02
10 qualname=example01
11 propagate=0
12 [logger_example02]
13 handlers=hand01,hand03
14 qualname=example02
15 propagate=0
16 ###############################################
17 [handlers]
18 keys=hand01,hand02,hand03
19 [handler_hand01]
20 class=StreamHandler
21 level=INFO
22 formatter=form02
23 args=(sys.stderr,)
24 [handler_hand02]
25 class=FileHandler
26 level=DEBUG
27 formatter=form01
28 args=('myapp.log', 'a')
29 [handler_hand03]
30 class=handlers.RotatingFileHandler
31 level=INFO
32 formatter=form02
33 args=('myapp.log', 'a', 10*1024*1024, 5)
34 ###############################################
35 [formatters]
36 keys=form01,form02
37 [formatter_form01]
38 format=%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s
39 datefmt=%a, %d %b %Y %H:%M:%S
40 [formatter_form02]
41 format=%(name)-12s: %(levelname)-8s %(message)s
42 datefmt=

1 import logging
2 import logging.config
3 
4 logging.config.fileConfig("logger.conf")
5 logger = logging.getLogger("example01")
6 
7 logger.debug('This is debug message')
8 logger.info('This is info message')
9 logger.warning('This is warning message')

1 import logging
2 import logging.config
3 
4 logging.config.fileConfig("logger.conf")
5 logger = logging.getLogger("example02")
6 
7 logger.debug('This is debug message')
8 logger.info('This is info message')
9 logger.warning('This is warning message')