py日志输出
下面我们看一个更标准的程序：
>>> import logging
>>> logger=logging.getLogger()
>>> handler=logging.FileHandler("Log_test.txt")
>>> logger.addHandler(handler)
>>> logger.setLevel(logging.NOTSET)
>>> logger.error("This is an error message")
>>> logger.info("This is an info message")
>>> logger.critical("This is a critical message")
日志文件中会出现三行内容：
This is an error message
This is an info message
This is a critical message
======================================
#!/usr/bin/python
import logging
fname1 = 'test1.txt'
fname2 = 'test2.txt'
def iniLog():
logger = logging.getLogger() #起个logger
filehandler = logging.FileHandler(fname1) ＃handler有多种，filehandler，streamhandler＝＝
streamhandler = logging.StreamHandler()
fmt = logging.Formatter('%(asctime)s, %(funcName)s, %(message)s') ＃格式化日志
logger.setLevel(logging.DEBUG) ＃设置级别
logger.addHandler(filehandler) ＃挂上handler
logger.addHandler(streamhandler)
return logger
＃This function does nothing if the root logger already has handlers configured.这个是文档上的原话，哈哈
logging.basicConfig(filename=fname2, level=logging.INFO)
logging.info("do 1") ＃这个调用和下面那个结果可是不一样的，这个只写file2，并且不会在终端打印日志
logger = iniLog()
logger.info("do 2") ＃这个往两个file都写，并且向终端打印日志
================================
c="a string to print to file"
f=open('out.txt','w')
print >>f,c
f.close()
============================
import logging
import urllib, os
import sys
LOGPATH = os.path.abspath(os.path.dirname(sys.argv[0]))+'\com_server.py.log'
def logger_constructor():
logger = logging.getLogger()
hdlr = logging.FileHandler(LOGPATH)
formatter = logging.Formatter(u'[%(asctime)s]%(levelname)-8s"%(message)s"','%Y-%m-%d %a %H:%M:%S')
hdlr.setFormatter(formatter)
logger.addHandler(hdlr)
logger.setLevel(logging.NOTSET)
return logger
global_logger = logger_constructor()
def trace_log(msg):
global_logger.debug(msg)
def DEBUGMSG(s):
s = s.replace('\r','').replace('\n','')
if (s):
print "%s: %s" % (time.ctime(), s)
trace_log(s)
DEBUGMSG('kkkk')
============================
发现python里面扩展了日志打印功能 。感觉比java自带的还好，和log4j很类似。
下面总结 下其用法。先说一种不用 配置文件 的：
<log.py>
#
-*- codin g: gb2312 -*-
2
import
logging3
4
logging.basicConfig(level
=
logging.INFO ,5
for mat
=
'
%(asctime)s %(name)-12s %(levelname)-8s %(message)s
'
,6
datefmt
=
'
%m-%d %H:%M
'
,7
filename
=
'
./AutoUpdate.log
'
,8
filemode
=
'
w
'
)9
10
console
=
logging.StreamHandler()11
console.setLevel(logging.INFO)12
formatter
=
logging.Formatter(
'
%(name)-12s: %(levelname)-8s %(message)s
'
)13
console.setFormatter(formatter)14
logging.getLogger(
''
).addHandler(console)15
16
17
#
#
18
#
console = logging.StreamHandler()
19
#
console = setLevel(logging.DEBUG )
20
#
formatter = logging.Formatter('%(name)-12s: %(levelname)-8s %(message)s')
21
#
console.setFormatter(formatter)
22
#
logging.getLogger('').addHandler(console)
23
24
25
def
getLogging(name):26
return
logging.getLogger(name)
<test.py>
import
log testlog
=
log.getLogging(
'
test
'
) testlog.error(
"
~~~~~~~~~~~~~~test1.
"
) testlog.info(
"
~~~~~~~~~~~~~~test2.
"
) testlog.exception(
"
~~~~~~~~~~~~~~~~~~~~~~~~~test3.
"
)