logging模块用来写日志文件

有5个级别，debug()，info()，warning()，error()和critical()，级别最高的为critical()

debug()为调试模式，info()为正常情况下的信息，warning()为警告，error()为错误，critical()为严重问题

普通的打印

# -*- coding:utf-8 -*-__author__ = "MuT6 Sch01aR"import logginglogging.debug('The debug')logging.info('The info')logging.warning('Request outtime')logging.error('The python run error')logging.critical('The server down')

运行结果

5个级别中只打印了警告级别及之后的语句，因为Logger的默认级别为warning

写入日志文件

# -*- coding:utf-8 -*-__author__ = "MuT6 Sch01aR"import logginglogging.basicConfig(filename='log_test.log',level=logging.INFO)logging.debug('This python is running')logging.info('The infomation of python')logging.warning('Request outtime')logging.error('The python run error')logging.critical('The server down')

level=loggin.INFO，把日志级别设置为INFO，只有INFO或比INFO级别更高的日志才会被写到日志文件里

写入日志文件的内容

只从info级别开始写入内容，debug级别比info低，没有写入

日志格式化

%(name)s        logger的名称

# -*- coding:utf-8 -*-__author__ = "MuT6 Sch01aR"import logginglogging.basicConfig(format='%(name)s',level=logging.INFO)logging.debug('This python is running')logging.info('The infomation of python')logging.warning('Request outtime')logging.error('The python run error')logging.critical('The server down')

运行结果

%(levelno)s   数字形式的日志级别，%(levelname)s   文本形式的日志级别

# -*- coding:utf-8 -*-__author__ = "MuT6 Sch01aR"import logginglogging.basicConfig(format='%(levelno)s,%(levelname)s',level=logging.INFO)logging.debug('This python is running')logging.info('The infomation of python')logging.warning('Request outtime')logging.error('The python run error')logging.critical('The server down')

运行结果

%(lineno)d      调用日志输出函数的语句所在的代码行

# -*- coding:utf-8 -*-__author__ = "MuT6 Sch01aR"import logginglogging.basicConfig(format='%(lineno)d',level=logging.INFO)logging.debug('This python is running')logging.info('The infomation of python')logging.warning('Request outtime')logging.error('The python run error')logging.critical('The server down')

运行结果

%(pathname)s    调用日志输出函数的模块的完整路径名

# -*- coding:utf-8 -*-__author__ = "MuT6 Sch01aR"import logginglogging.basicConfig(format='%(pathname)s',level=logging.INFO)logging.debug('This python is running')logging.info('The infomation of python')logging.warning('Request outtime')logging.error('The python run error')logging.critical('The server down')

 运行结果

%(filename)s    调用日志输出函数的模块的文件名

# -*- coding:utf-8 -*-__author__ = "MuT6 Sch01aR"import logginglogging.basicConfig(format='%(filename)s',level=logging.INFO)logging.debug('This python is running')logging.info('The infomation of python')logging.warning('Request outtime')logging.error('The python run error')logging.critical('The server down')

 运行结果

%(module)s      调用日志输出函数的模块名

# -*- coding:utf-8 -*-__author__ = "MuT6 Sch01aR"import logginglogging.basicConfig(format='%(module)s',level=logging.INFO)logging.debug('This python is running')logging.info('The infomation of python')logging.warning('Request outtime')logging.error('The python run error')logging.critical('The server down')

 运行结果

就是文件名，没有后缀

%(funcName)s    调用日志输出函数的函数名

# -*- coding:utf-8 -*-__author__ = "MuT6 Sch01aR"import logginglogging.basicConfig(format='%(funcName)s',level=logging.INFO)def log_test():    logging.debug('This python is running')    logging.info('The infomation of python')    logging.warning('Request outtime')    logging.error('The python run error')    logging.critical('The server down')log_test()

 运行结果

%(created)f     当前时间，用UNIX标准的表示时间的浮点数表示

# -*- coding:utf-8 -*-__author__ = "MuT6 Sch01aR"import logginglogging.basicConfig(format='%(created)f',level=logging.INFO)logging.debug('This python is running')logging.info('The infomation of python')logging.warning('Request outtime')logging.error('The python run error')logging.critical('The server down')

 运行结果

%(relativeCreated)d   输出日志信息自创建以来的毫秒数

# -*- coding:utf-8 -*-__author__ = "MuT6 Sch01aR"import loggingimport timelogging.basicConfig(format='%(relativeCreated)d',level=logging.INFO)logging.debug('This python is running')time.sleep(2)logging.info('The infomation of python')logging.warning('Request outtime')logging.error('The python run error')logging.critical('The server down')

 运行结果

结果是不定的

%(asctime)s  字符串形式的当前时间，默认格式为“2018-02-15 17:59:31,546”，逗号后面的是毫秒

# -*- coding:utf-8 -*-__author__ = "MuT6 Sch01aR"import logginglogging.basicConfig(format='%(asctime)s',level=logging.INFO)logging.debug('This python is running')logging.info('The infomation of python')logging.warning('Request outtime')logging.error('The python run error')logging.critical('The server down')

运行结果

%(thread)d  当前线程号，%(threadName)s  当前线程名

# -*- coding:utf-8 -*-__author__ = "MuT6 Sch01aR"import logginglogging.basicConfig(format='%(thread)d,%(threadName)s',level=logging.INFO)logging.debug('This python is running')logging.info('The infomation of python')logging.warning('Request outtime')logging.error('The python run error')logging.critical('The server down')

 运行结果

%(process)d      进程号

# -*- coding:utf-8 -*-__author__ = "MuT6 Sch01aR"import logginglogging.basicConfig(format='%(process)d',level=logging.INFO)logging.debug('This python is running')logging.info('The infomation of python')logging.warning('Request outtime')logging.error('The python run error')logging.critical('The server down')

 运行结果

%(message)s     用户输出的消息

# -*- coding:utf-8 -*-__author__ = "MuT6 Sch01aR"import logginglogging.basicConfig(format='%(message)s',level=logging.INFO)logging.debug('This python is running')logging.info('The infomation of python')logging.warning('Request outtime')logging.error('The python run error')logging.critical('The server down')

 运行结果

格式化的日志写入

# -*- coding:utf-8 -*-__author__ = "MuT6 Sch01aR"import logginglogging.basicConfig(filename='log_test.log',level=logging.INFO,format='%(message)s',datefmt='%m')logging.debug('This python is running')logging.info('The infomation of python')logging.warning('Request outtime')logging.error('The python run error')logging.critical('The server down')

 运行结果