python中的日志级别

Python按照重要程度把日志分为5个级别，如下：

可以通过level参数，设置不同的日志级别。当设置为高的日志级别时，低于此级别的日志不再打印。

五种日志级别按从低到高排序：

DEBUG < INFO < WARNING < ERROR < CRITICAL

level设置为DEBUG级别，所有的日志都会打印

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!’)

2019-11-17 15:24:30,065 – DEBUG -Some debugging details.

2019-11-17 15:24:30,074 – INFO -The logging module is working

2019-11-17 15:24:30,086 – WARNING -An error message is about to be logged.

2019-11-17 15:24:30,105 – ERROR -An error has occurred.

2019-11-17 15:24:30,107 – CRITICAL -The program is unable to recover!

level设置为ERROR级别时，只显示ERROR和CRITICAL日志

import logging

logging.basicConfig(level=logging.ERROR, 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!’)

2019-11-17 15:30:46,767 – ERROR -An error has occurred.

2019-11-17 15:30:46,768 – CRITICAL -The program is unable to recover!