Python logging模块

日志作用：

调试

辅助定位问题

数据分析

日志的级别

 

 

五种日志级别按从低到高排序：

　　DEBUG < INFO < WARNING < ERROR < CRITICAL

日志的用法：

import logging
logging.basicConfig(level=logging.DEBUG, format=' %(asctime)s - %(levelname)s -%(message)s')
logging.debug('Some debugging details.')
logging.info('The logging module is working')
logging.warning('An error message is about to be logged.')
logging.error('An error has occurred.')
logging.critical('The program is unable to recover!')

 

官网信息：

https://docs.python.org/3/howto/logging.html 

basicConfig需要在最前面定义好

import logging
#默认设置warning级别，即warning级别以上log才会打印
logging.warning('Watch out!')  # will print a message to the console
logging.info('I told you so')  # will not print anything

设置默认级别

logging.basicConfig(level=logging.INFO)

设置log保存在文件里

import logging

logging.basicConfig(filename='example.log', encoding='utf-8', level=logging.DEBUG)
logging.debug('This message should go to the log file')
logging.info('So should this')
logging.warning('And this, too')
logging.error('And non-ASCII stuff, too, like Øresund and Malmö')

显示日期和时间

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

更改日期时间显示格式

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