python 日志

日志级别严重性

• DEBUG：细节信息，仅当诊断问题的时候适用
• INFO：确认程序按预期运行
• WARNING：表明有已经或即将发生的意外。程序仍按预期进行。
• ERROR：由于严重的问题，程序的某些功能已经不能正常执行
• CRITICAL：严重的错误，表明程序已不能继续进行

import logging
logging.warning('watch out')
logging.info('it is ok')

WARNING:root:watch out   # 默认的级别是warning 只会追踪该级别及以上的事件，除非更改日志配置

日志配置

记录日志到文件中

logging.basicConfig(filename='example.log', encoding='utf-8', level=logging.DEBUG)

记录变量数据

logging.warning('%s before you %s', 'Look', 'leap!')

更改消息显示的格式

logging.basicConfig(format='%(levelname)s:%(message)s', level=logging.DEBUG)
logging.debug('This message should appear on the console')
logging.info('So should this')
logging.warning('And this, too')

DEBUG:This message should appear on the console
INFO:So should this
WARNING:And this, too

在消息中显示日期和时间

logging.basicConfig(format='%(asctime)s %(message)s') logging.warning('is when this event was logged.')

2024-04-17 23:01:48,365 is when this event was logged.

logging.basicConfig(format='%(asctime)s %(message)s', datefmt='%m/%d/%Y %I:%M:%S %p')
logging.warning('is when this event was logged.')

datefmt 参数的格式与 time.strftime() 支持的格式相同

04/17/2024 11:03:12 PM is when this event was logged.