Python标准库之logging模块

很多程序都有记录日志的需求，并且日志中包含的信息即有正常的程序访问日志，还可能有错误、警告等信息输出，python的logging模块提供了标准的日志接口，你可以通过它存储各种格式的日志，logging的日志可以分为 debug()、info()、warning()、 error() 、critical() 5个级别。

import logging

logging.debug("debug message")logging.info("Input user/passwd")logging.error("Error")logging.warning("User already inputed three time username/password!")logging.critical("The username was locking!")

日志级别

把日志写到文件

其中下面这句中的level=loggin.DEBUG意思是，把日志纪录级别设置为DEBUG，也就是说，只有比日志是DEBUG或比DEBUG级别更高的日志才会被记录到文件里

import logging

logging.basicConfig(filename="tesxt.log",level=logging.DEBUG)
logging.debug("debug message")
logging.info("Input user/passwd")
logging.error("Error")
logging.warning("User already inputed three time username/password!")
logging.critical("The username was locking!")

输出结果：

给日志增加时间

import logging

logging.basicConfig(format=‘%(asctime)s %(message)s‘, datefmt=‘%m/%d/%Y %I:%M:%S %p‘)
logging.debug("debug message")
logging.info("Input user/passwd")
logging.error("Error")
logging.warning("User already inputed three time username/password!")
logging.critical("The username was locking!")

日志格式

把日志打印在屏幕上

import logging

#create logger
logger = logging.getLogger(‘TEST-LOG‘)
logger.setLevel(logging.DEBUG)

# create console handler and set level to debug
ch = logging.StreamHandler()
ch.setLevel(logging.DEBUG)

# create file handler and set level to warning
fh = logging.FileHandler("access.log")
fh.setLevel(logging.WARNING)
# create formatter
formatter = logging.Formatter(‘%(asctime)s - %(name)s - %(levelname)s - %(message)s‘)

# add formatter to ch and fh
ch.setFormatter(formatter)
fh.setFormatter(formatter)

# add ch and fh to logger
logger.addHandler(ch)
logger.addHandler(fh)

# ‘application‘ code
logger.debug(‘debug message‘)
logger.info(‘info message‘)
logger.warn(‘warn message‘)
logger.error(‘error message‘)
logger.critical(‘critical message‘)

原文地址：https://www.cnblogs.com/endust/p/12312799.html