Python 实现日志同时输出到屏幕和文件
(编辑：jimmy 日期: 2024/11/19 浏览：3 次 )
1. 日志输出到屏幕
#!/usr/bin/env python
# -*- coding: utf-8 -*-
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import logging
logging.basicConfig(level=logging.NOTSET, format='%(asctime)s - %(name)s - %(levelname)s - %(message)s')
logging.debug('This is a debug message.')
logging.info('This is an info message.')
logging.warning('This is a warning message.')
logging.error('This is an error message.')
logging.critical('This is a critical message.')
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 2019-06-26 16:00:45,990 - root - DEBUG - This is a debug message. 2019-06-26 16:00:45,990 - root - INFO - This is an info message. 2019-06-26 16:00:45,990 - root - WARNING - This is a warning message. 2019-06-26 16:00:45,990 - root - ERROR - This is an error message. 2019-06-26 16:00:45,990 - root - CRITICAL - This is a critical message. Process finished with exit code 0
2. 日志输出到文件
#!/usr/bin/env python
# -*- coding: utf-8 -*-
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import logging
import os.path
import time
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('This is a debug message.')
logger.info('This is an info message.')
logger.warning('This is a warning message.')
logger.error('This is an error message.')
logger.critical('This is a critical message.')
/usr/bin/python2.7 /home/strong/git_workspace/MonoGRNet/test.py /home/strong/git_workspace/MonoGRNet Process finished with exit code 0
201906261627.log
2019-06-26 16:27:26,899 - test.py[line:30] - INFO: This is an info message. 2019-06-26 16:27:26,899 - test.py[line:31] - WARNING: This is a warning message. 2019-06-26 16:27:26,899 - test.py[line:32] - ERROR: This is an error message. 2019-06-26 16:27:26,899 - test.py[line:33] - CRITICAL: This is a critical message.
3. 日志同时输出到屏幕和文件
#!/usr/bin/env python
# -*- coding: utf-8 -*-
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import logging
import os.path
import time
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('This is a debug message.')
logger.info('This is an info message.')
logger.warning('This is a warning message.')
logger.error('This is an error message.')
logger.critical('This is a critical message.')
/usr/bin/python2.7 /home/strong/git_workspace/MonoGRNet/test.py /home/strong/git_workspace/MonoGRNet This is a warning message. This is an error message. This is a critical message. Process finished with exit code 0
201906261636.log
2019-06-26 16:36:38,385 - test.py[line:34] - INFO: This is an info message. 2019-06-26 16:36:38,385 - test.py[line:35] - WARNING: This is a warning message. 2019-06-26 16:36:38,385 - test.py[line:36] - ERROR: This is an error message. 2019-06-26 16:36:38,385 - test.py[line:37] - CRITICAL: This is a critical message.
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