===============================================
#最普通的log打印
import logging
log_file="/tmp/mylog.log"
logging.basicConfig(filename=log_file,level=logging.DEBUG)
def fun1():
logging.debug("This is running fun1")
if __name__=="__main__":
fun1()
==============================================略复杂============
import logging
log_file="/tmp/mylog2.log"
log_level=logging.DEBUG
handler = logging.FileHandler(log_file) #handler设置日志输出到的文件地址
formatter = logging.Formatter("[%(levelname)s][%(funcName)s][%(asctime)s]%(message)s") # formatter定义日志输出的格式
handler .setFormatter(formatter) #将格式加载到handler中
logger = logging.getLogger("test2")#定义logger
logger.addHandler(handler)#将指定日志输出的handler加载到logger中
logger.setLevel(log_level)#定义logger的输出级别
def func1():
logger.debug("This is debug msg ")
logger.info("This is info msg")
logger.warn("This is warning msg")
logger.error("This is error msg")
logger.critical("This is critical msg")
if __name__ == "__main__":
func1()
======================================实现单例模式的logger============
import logging.handlers
class FinalLogger:
logger=None
level={"n":logging.NOTSET,
"d":logging.DEBUG,
"i":logging.INFO,
"w":logging.WARN,
"e":logging.ERROR,
"c":logging.CRITICAL}
log_level = "d"
log_file="final_logger.log" #日志路径，这样写是当前目录
log_max_byte=10*1024*1024 #每个备份文件最多10M
log_bakcup_count=5 # 最多备份文件
@classmethod
def getLogger(self):
if FinalLogger.logger:
return FinalLogger.logger
FinalLogger.logger = logging.getLogger("logging_test3")
log_handler = logging.handlers.RotatingFileHandler(filename=FinalLogger.log_file,maxBytes=FinalLogger.log_max_byte,backupCount=FinalLogger.log_bakcup_count)
log_fmt = logging.Formatter("[%(levelname)s][%(funcName)s][%(asctime)s]%(message)s")
log_handler.setFormatter(log_fmt)
FinalLogger.logger.addHandler(log_handler)
FinalLogger.logger.setLevel(FinalLogger.level.get(FinalLogger.log_level))
return FinalLogger.logger
class TestFialLogger:
logger = FinalLogger.getLogger()
def func1(self):
self.logger.debug("This is debug msg ")
self.logger.info("This is info msg")
self.logger.warn("This is warning msg")
def func2(self):
self.logger.error("This is error msg")
self.logger.critical("This is critical msg")
if __name__ == "__main__":
testLogger = TestFialLogger()
testLogger.func1()
testLogger2 = TestFialLogger()
testLogger2.func2()
if testLogger.logger == testLogger2.logger:
print "YES"
else:
print "NO"
================================================================
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
========================================================================================
import sys
#将输出重定向到文件
origin = sys.stdout
f = open(‘file.txt‘,‘w‘)
sys.stdout = f
print ‘start............‘
print ‘end..............‘
sys.stdout = origin
f.close()
#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)s] %(levelname)s %(message)s‘,filename=‘logging_test4.log‘,filemode=‘w‘)
#定义一个StreamHandler将INFO或更高级别的日志信息打印到标准错误，并将其添加到当前日志处理对象
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 msg")
logging.info("This is info msg")
logging.warning("This is warning msg")
参考文章：
http://www.cnblogs.com/dkblog/archive/2011/08/26/2155018.html
https://my.oschina.net/leejun2005/blog/126713原文地址：http://592800277.blog.51cto.com/9783296/1855567
