【590】Python logging 模块

参考：python logging模块，升级print调试到logging

参考：Python之日志处理（logging模块）

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　　个人理解：通过日志记录来进行程序调试的各种输出信息，可以设置不同的输出级别，因此可以根据级别的设置来输出不同的信息。

　　输出级别：

• DEBUG
• INFO
• NOTICE
• WARNING
• ERROR
• CRITICAL
• ALERT
• EMERGENCY

　　测试代码：

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import logging import sys   # 获取logger实例，如果参数为空则返回root logger logger = logging.getLogger("AppName")   # 指定logger输出格式 formatter = logging.Formatter('%(asctime)s %(levelname)-8s: (%(name)s)%(pathname)s %(message)s')   # 文件日志（存储在当前文件的路径内） file_handler = logging.FileHandler("test.log") file_handler.setFormatter(formatter)  # 可以通过setFormatter指定输出格式   # 控制台日志 console_handler = logging.StreamHandler(sys.stdout) console_handler.formatter = formatter  # 也可以直接给formatter赋值   # 为logger添加的日志处理器 logger.addHandler(file_handler) logger.addHandler(console_handler)   # 指定日志的最低输出级别，默认为WARN级别 logger.setLevel(logging.DEBUG)   # 输出不同级别的log logger.debug('this is debug info') logger.info('this is information') logger.warning('this is warning message') logger.error('this is error message') logger.fatal('this is fatal message, it is same as logger.critical') logger.critical('this is critical message') # 记录异常信息   try:     1 / 0 except:     logger.exception('except:')   # 移除文件日志处理器，那么log文件就不记录这些日志了 logger.removeHandler(file_handler) logger.debug('this is debug info----2') #修改日志输出级别 logger.setLevel(logging.ERROR) logger.info('this is information----2') logger.warning('this is warning message----2') logger.error('this is error message----2') logger.fatal('this is fatal message, it is same as logger.critical----2') logger.critical('this is critical message----2')

　　显示效果：

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2021-07-02 15:31:51,522 DEBUG   : (AppName)<ipython-input-1-f60e9cd2b07f> this is debug info 2021-07-02 15:31:51,523 INFO    : (AppName)<ipython-input-1-f60e9cd2b07f> this is information 2021-07-02 15:31:51,524 WARNING : (AppName)<ipython-input-1-f60e9cd2b07f> this is warning message 2021-07-02 15:31:51,525 ERROR   : (AppName)<ipython-input-1-f60e9cd2b07f> this is error message 2021-07-02 15:31:51,526 CRITICAL: (AppName)<ipython-input-1-f60e9cd2b07f> this is fatal message, it is same as logger.critical 2021-07-02 15:31:51,527 CRITICAL: (AppName)<ipython-input-1-f60e9cd2b07f> this is critical message 2021-07-02 15:31:51,528 ERROR   : (AppName)<ipython-input-1-f60e9cd2b07f> except: Traceback (most recent call last):   File "<ipython-input-1-f60e9cd2b07f>", line 35, in <module>     1 / 0 ZeroDivisionError: division by zero 2021-07-02 15:31:51,529 DEBUG   : (AppName)<ipython-input-1-f60e9cd2b07f> this is debug info----2 2021-07-02 15:31:51,529 ERROR   : (AppName)<ipython-input-1-f60e9cd2b07f> this is error message----2 2021-07-02 15:31:51,530 CRITICAL: (AppName)<ipython-input-1-f60e9cd2b07f> this is fatal message, it is same as logger.critical----2 2021-07-02 15:31:51,530 CRITICAL: (AppName)<ipython-input-1-f60e9cd2b07f> this is critical message----2