Python 实现日志同时输出到屏幕和文件
1.日志输出到屏幕
#!/usr/bin/envpython
#-*-coding:utf-8-*-
from__future__importabsolute_import
from__future__importdivision
from__future__importprint_function
importlogging
logging.basicConfig(level=logging.NOTSET,format='%(asctime)s-%(name)s-%(levelname)s-%(message)s')
logging.debug('Thisisadebugmessage.')
logging.info('Thisisaninfomessage.')
logging.warning('Thisisawarningmessage.')
logging.error('Thisisanerrormessage.')
logging.critical('Thisisacriticalmessage.')
默认的level是logging.WARNING，低于这个级别的就不输出了。如果需要显示低于logging.WARNING级别的内容，可以引入logging.NOTSET级别来显示。
DEBUG-打印全部的日志。详细的信息，通常只出现在诊断问题上。
INFO-打印INFO、WARNING、ERROR、CRITICAL级别的日志。确认一切按预期运行。
WARNING-打印WARNING、ERROR、CRITICAL级别的日志。表明一些问题在不久的将来，这个软件还能按预期工作。
ERROR-打印ERROR、CRITICAL级别的日志。更严重的问题，软件没能执行一些功能。
CRITICAL:打印CRITICAL级别。一个严重的错误，表明程序本身可能无法继续运行。
/usr/bin/python2.7/home/strong/git_workspace/MonoGRNet/test.py 2019-06-2616:00:45,990-root-DEBUG-Thisisadebugmessage. 2019-06-2616:00:45,990-root-INFO-Thisisaninfomessage. 2019-06-2616:00:45,990-root-WARNING-Thisisawarningmessage. 2019-06-2616:00:45,990-root-ERROR-Thisisanerrormessage. 2019-06-2616:00:45,990-root-CRITICAL-Thisisacriticalmessage. Processfinishedwithexitcode0
2.日志输出到文件
#!/usr/bin/envpython
#-*-coding:utf-8-*-
from__future__importabsolute_import
from__future__importdivision
from__future__importprint_function
importlogging
importos.path
importtime
logger=logging.getLogger()
logger.setLevel(logging.DEBUG)
time_line=time.strftime('%Y%m%d%H%M',time.localtime(time.time()))
print(os.getcwd())
log_path=os.path.dirname(os.getcwd())+'/'
logfile=log_path+time_line+'.log'
handler=logging.FileHandler(logfile,mode='w')
handler.setLevel(logging.INFO)
formatter=logging.Formatter("%(asctime)s-%(filename)s[line:%(lineno)d]-%(levelname)s:%(message)s")
handler.setFormatter(formatter)
logger.addHandler(handler)
logger.debug('Thisisadebugmessage.')
logger.info('Thisisaninfomessage.')
logger.warning('Thisisawarningmessage.')
logger.error('Thisisanerrormessage.')
logger.critical('Thisisacriticalmessage.')
/usr/bin/python2.7/home/strong/git_workspace/MonoGRNet/test.py /home/strong/git_workspace/MonoGRNet Processfinishedwithexitcode0
201906261627.log
2019-06-2616:27:26,899-test.py[line:30]-INFO:Thisisaninfomessage. 2019-06-2616:27:26,899-test.py[line:31]-WARNING:Thisisawarningmessage. 2019-06-2616:27:26,899-test.py[line:32]-ERROR:Thisisanerrormessage. 2019-06-2616:27:26,899-test.py[line:33]-CRITICAL:Thisisacriticalmessage.
3.日志同时输出到屏幕和文件
#!/usr/bin/envpython
#-*-coding:utf-8-*-
from__future__importabsolute_import
from__future__importdivision
from__future__importprint_function
importlogging
importos.path
importtime
logger=logging.getLogger(__name__)
logger.setLevel(level=logging.DEBUG)
time_line=time.strftime('%Y%m%d%H%M',time.localtime(time.time()))
print(os.getcwd())
log_path=os.path.dirname(os.getcwd())+'/'
logfile=log_path+time_line+'.log'
handler=logging.FileHandler(logfile,mode='w')
handler.setLevel(logging.INFO)
formatter=logging.Formatter("%(asctime)s-%(filename)s[line:%(lineno)d]-%(levelname)s:%(message)s")
handler.setFormatter(formatter)
console=logging.StreamHandler()
console.setLevel(logging.WARNING)
logger.addHandler(handler)
logger.addHandler(console)
logger.debug('Thisisadebugmessage.')
logger.info('Thisisaninfomessage.')
logger.warning('Thisisawarningmessage.')
logger.error('Thisisanerrormessage.')
logger.critical('Thisisacriticalmessage.')
/usr/bin/python2.7/home/strong/git_workspace/MonoGRNet/test.py /home/strong/git_workspace/MonoGRNet Thisisawarningmessage. Thisisanerrormessage. Thisisacriticalmessage. Processfinishedwithexitcode0
201906261636.log
2019-06-2616:36:38,385-test.py[line:34]-INFO:Thisisaninfomessage. 2019-06-2616:36:38,385-test.py[line:35]-WARNING:Thisisawarningmessage. 2019-06-2616:36:38,385-test.py[line:36]-ERROR:Thisisanerrormessage. 2019-06-2616:36:38,385-test.py[line:37]-CRITICAL:Thisisacriticalmessage.
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