logging模块

import logging

# #
# logging.warning("user [alex] attempted wrong password more than 3 times")
# logging.critical("server is down")


logging.basicConfig(filename=‘log_test.log‘,
                    level=logging.DEBUG,
                    format=‘%(asctime)s:%(levelname)s:%(filename)s:%(funcName)s:%(lineno)d:%(process)d %(message)s‘,
                    datefmt=‘%Y-%m-%d %I:%M:%S %p‘)


def sayhi():
    logging.error("from sayhi....")

sayhi()
logging.debug(‘This message should go to the log file‘)
logging.info(‘So should this‘)
logging.warning(‘And this, too‘)

四个类如何用：


import logging


class IgnoreBackupLogFilter(logging.Filter):
    """忽略带db backup 的日志"""
    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.DEBUG)#设置输出级别

# 全局的输出级别是最高的，如果这里设置了，handler就没用了 全局如果不设置的话，就是warning

#要让handler有用，全局的级别要设到比handler最低


#1.1 把filter对象添加到logger中
logger.addFilter(IgnoreBackupLogFilter())

#2、生成 handler对象

ch = logging.StreamHandler()  #到屏幕的handler
ch.setLevel(logging.INFO)  #屏幕输出debug级别


fh = logging.FileHandler(‘web.log‘) #到文件的handler
fh.setLevel(logging.WARNING) #文件输出warning级别

#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 - %(name)s - %(levelname)s - %(message)s‘)
console_formatter = logging.Formatter(‘%(asctime)s - %(name)s - %(levelname)s - %(lineno)d - %(message)s‘)

#3.1把formatter对象绑定handler对象

ch.setFormatter(console_formatter)  #和handler绑定
fh.setFormatter(file_formatter)

logger.debug("test log")
logger.info("test log2")
logger.info("test db backup log")
logger.warning("test log3")