python开发【常用模块】：日志模块

日志模块的设置流程

import logging
from logging import handlers
class IgnoreBackupLogFilter(logging.Filter):
    def filter(self, record):#固定写法
        return 'db backup' not in record.getMessage()

#1、生成logger对象
logger = logging.getLogger("web")
logger.setLevel(logging.INFO)
logger.addFilter(IgnoreBackupLogFilter())
#2、生成handler对象
ch= logging.StreamHandler()
#ch.setLevel(logging.INFO)
#fh = logging.FileHandler('web.log')
#fh = handlers.RotatingFileHandler('web.log',maxBytes=10, backupCount=3)#以文件的大小生成日志文件，最多3个
fh = handlers.TimedRotatingFileHandler('add.log',when='S',interval=5,backupCount=3)#以5秒为周期生成日志文件，最多3个
#fh.setLevel(logging.WARNING)
#2.1把handler对象 绑定到logger
logger.addHandler(ch)
logger.addHandler(fh)
#3、生成formatter对象
file_formatter = logging.Formatter('%(asctime)s:%(levelname)s:%(name)s:%(message)s')
console_formatter =logging.Formatter('%(asctime)s:%(levelname)s:%(filename)s:%(lineno)s,%(message)s')
#3.1把formatter对象绑定到handler
ch.setFormatter(console_formatter)
fh.setFormatter(file_formatter)

logger.debug('debug this is')
logger.warning('warning is this')
logger.info('info is this db backup')

#全局如果不设置级别，默认warning，并且级别优先级最高