1. 日志输出到屏幕

#!/usr/bin/env python# -*- coding: utf-8 -*-from __future__ import absolute_importfrom __future__ import divisionfrom __future__ import print_functionimport logginglogging.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.py2019-06-26 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_importfrom __future__ import divisionfrom __future__ import print_functionimport loggingimport os.pathimport timelogger = 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/MonoGRNetProcess 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_importfrom __future__ import divisionfrom __future__ import print_functionimport loggingimport os.pathimport timelogger = 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/MonoGRNetThis 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.

以上这篇Python 实现日志同时输出到屏幕和文件就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。