Python中的logging模块就这么用

Python中的logging模块就这么用

# coding=utf-8
__author__ = 'liu.chunming'
import logginglogging.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')

# coding=utf-8
__author__ = 'liu.chunming'
import logginglogging.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')

# coding=utf-8
__author__ = 'liu.chunming'
import logging# 第一步，创建一个logger
logger = logging.getLogger()
logger.setLevel(logging.INFO) # Log等级总开关# 第二步，创建一个handler，用于写入日志文件
logfile = './log/logger.txt'
fh = logging.FileHandler(logfile, mode='w')
fh.setLevel(logging.DEBUG) # 输出到file的log等级的开关# 第三步，再创建一个handler，用于输出到控制台
ch = logging.StreamHandler()
ch.setLevel(logging.WARNING) # 输出到console的log等级的开关# 第四步，定义handler的输出格式
formatter = logging.Formatter("%(asctime)s - %(filename)s[line:%(lineno)d] - %(levelname)s: %(message)s")
fh.setFormatter(formatter)
ch.setFormatter(formatter)# 第五步，将logger添加到handler里面
logger.addHandler(fh)
logger.addHandler(ch)# 日志
logger.debug('this is a logger debug message')
logger.info('this is a logger info message')
logger.warning('this is a logger warning message')
logger.error('this is a logger error message')
logger.critical('this is a logger critical message')

和main.py

运行后打开log.txt，结果如下：

import logging
import os
FILE=os.getcwd()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 = os.path.join(FILE,'log.txt'),
filemode='w')
logging.info('msg')
logging.debug('msg2')

import logging
'''命名'''
log2=logging.getLogger('BeginMan') #生成一个日志对象
print log2 #<logging.Logger object at 0x00000000026D1710>'''无名'''
log3 = logging.getLogger()
print log3 #<logging.RootLogger object at 0x0000000002721630> 如果没有指定name，则返回RootLogger'''最好的方式'''
log = logging.getLogger(__name__)#__name__ is the module’s name in the Python package namespace.
print log #<logging.Logger object at 0x0000000001CD5518> Logger对象
print __name__ #__main__

print log.propagate #1

import logging
import os
logging.basicConfig(format="%(levelname)s,%(message)s",filename=os.path.join(os.getcwd(),'log.txt'),level=logging.DEBUG)
log = logging.getLogger('root.set') #Logger对象
print log.propagate #1
log.setLevel(logging.WARN) #日志记录级别为WARNNING
log.info('msg') #不会被记录
log.debug('msg') #不会被记录
log.warning('msg')
log.error('msg')

import logging
logging.basicConfig(filename = os.path.join(os.getcwd(), 'log.txt'), level = logging.DEBUG)
log = logging.getLogger('root')
log.debug('%s, %s, %s', *('error', 'debug', 'info'))
log.debug('%(module)s, %(info)s', {'module': 'log', 'info': 'error'})

log.log(logging.ERROR,'%(module)s %(info)s',{'module':'log日志','info':'error'}) #ERROR,log日志 error
log.log(logging.ERROR,'再来一遍：%s,%s',*('log日志','error')) #ERROR,再来一遍：log日志,error

import logging
import os
logging.basicConfig(format="%(levelname)s,%(message)s",filename=os.path.join(os.getcwd(),'log.txt'),level=logging.DEBUG)
log = logging.getLogger('root') #Logger对象
try:
raise Exception,u'错误异常'
except:
log.exception('exception') #异常信息被自动添加到日志消息中
打开文件，显示如下：'''ERROR,exception
Traceback (most recent call last):
File "E:\project\py\src\log3.py", line 12, in <module>
raise Exception,u'错误异常'
Exception: 错误异常
'''

#coding=utf8
'''
Created on 2013年9月23日
Function : Handler对象、Formatter对象、Filter对象、Filter对象
@author : BeginMan
'''
import logging
import os
'''Logger'''
l = logging.Logger('root') #创建Logger对象
log = logging.getLogger('root') #通过logging.getLogger创建Logger对象
print l #<logging.Logger object at 0x0000000001DF5B70>
print log #<logging.Logger object at 0x00000000022A16D8>'''Handler'''
handler = logging.Handler() #创建Handler对象
handler.__init__(logging.DEBUG) #通过设置level来初始化Handler实例
handler.createLock() #初始化一个线程锁可以用来序列化访问底层I / O功能,这可能不是线程安全的。
handler.acquire() #获取线程锁通过handler.createLock()
handler.release() #释放线程锁通过获取handler.acquire()
handler.setLevel(logging.DEBUG) #设置临界值，如果Logging信息级别小于它则被忽视，当一个handler对象被创建，级别没有被设置，导致所有的信息会被处理。
handler.setFormatter("%(levelname)s,%(message)s") #设置格式
# handler.addFilter(filter) #添加指定的过滤器
# handler.removeFilter(filter) #移除指定的过滤器
# handler.filter(record) #通过设置过滤器适用于记录并返回真值如果要处理的记录
handler.flush() #确保所有的日志输出已经被刷新
handler.close() #收拾任何所使用资源处理程序,
# handler.handle(record) #有条件地发出指定的日志记录,这取决于过滤器可能被添加到处理程序。
# handler.handlerError(record) #处理错误
# handler.format(record) #格式输出
# handler.emit(record)#Formatter:http://docs.python.org/2.7/library/logging.html#logging.Formatter'''Formatter:
the base Formatter allows a formatter string to be specified,is none ,used default value '%(message)s'
class logging.Formatter(fmt=None,datefmt=None)
If no fmt is specified, '%(message)s' is used. If no datefmt is specified, the ISO8601 date format is used.
'''
fm = logging.Formatter('%(levelname)s:%(message)s','%m/%d/%Y %I:%M:%S %p')
print fm #<logging.Formatter object at 0x0000000002311828>
#有如下方法:format()、formatTime()、formatException()#http://docs.python.org/2.7/library/logging.html#formatter-objects'''Filter'''
'''
class logging.Filter(name=''):
返回Filter实例，If name is specified, it names a logger which, together with its children,
will have its events allowed through the filter. If name is the empty string, allows every event.
用于Loggers、Handlers等过滤的设置
如果一个过滤器初始化为'A.B',则允许'A.B/A.B.C/A.B.C.D/A.B.D'等，但不允许'A.BB/B.A'等通过
如果初始化为空字符串，则没有过滤。
它有filter()方法
''''''LogRecord '''
'''class logging.LogRecord(name, level, pathname, lineno, msg, args, exc_info, func=None)
LogRecord 实例可以被Logger自动创建.也可以通过makeLogRecord()来创建'''
#http://docs.python.org/2.7/library/logging.html#logrecord-objects