Python日志模块的两种用法

川长思鸟来 2023-10-07 11:54 16阅读 0赞

import logging
    from logging.handlers import TimedRotatingFileHandler,RotatingFileHandler
    
    '''
    级别有如下：
    level=logging.NOTSET 0
    level=logging.DEBUG 10
    level=logging.INFO 20
    level=logging.WARNING 30
    level=logging.ERROR 40
    level=logging.CRITICAL 50
    
    
    logging.debug('This is a debug message')
    logging.info('This is an info message')
    logging.warning('This is a warning message')
    logging.error('This is an error message')
    logging.critical('This is a critical message')
    logging.exception('')捕获异常
    
    
    #写法一
    logging.basicConfig(filename="test.log", filemode="w",
                        format="%(asctime)s:%(pathname)s:第%(lineno)d行:%(name)s:%(levelname)s:%(message)s",
                        datefmt="%Y-%m-%d %H:%M:%S", level=logging.NOTSET)
    
    a = 5
    b = 0
    try:
        c = a / b
        logging.info('This is an info message')
    except Exception as e:
        # 下面三种方式三选一，推荐使用第一种
        # logging.exception("Exception occurred")
        # logging.error("Exception occurred", exc_info=True)
        # logging.log(level=logging.DEBUG, msg="Exception occurred", exc_info=True)
        logging.error('This is an error message')
    '''
    
    # 写法二
    
    logger = logging.getLogger("logger")
    logger.setLevel(logging.DEBUG)
    logger.propagate = False
    
    handler1 = logging.StreamHandler()
    # handler2 = logging.FileHandler(filename="test.log")
    '''
    TimedRotatingFileHandler(filename [,when [,interval [,backupCount]]])
    filename 是输出日志文件名的前缀
    
    when 是一个字符串的定义如下：
    
        “S”: Seconds
        “M”: Minutes
        “H”: Hours
        “D”: Days
        “W”: Week day (0=Monday)
        “midnight”: Roll over at midnight
    
    interval 是指等待多少个单位when的时间后，Logger会自动重建文件，当然，这个文件的创建取决于filename+suffix，
    若这个文件跟之前的文件有重名，则会自动覆盖掉以前的文件，所以有些情况suffix要定义的不能因为when而重复。
    
    backupCount 是保留日志个数。默认的0是不会自动删除掉日志。若设10，则在文件的创建过程中库会判断是否有超过这个10，
    若超过，则会从最先创建的开始删除。
    '''
    #handler2 = TimedRotatingFileHandler(filename="test.log",when='S', encoding='utf8',interval=3, backupCount=3)
    handler2 = RotatingFileHandler(filename="test.log", mode='a',maxBytes=1, encoding='utf8', backupCount=3)
    
    '''
    handler1.setLevel(logging.WARNING)
    handler2.setLevel(logging.WARNING)
    '''
    format_str = "%(asctime)s:%(pathname)s:第%(lineno)d行:%(name)s:%(levelname)s:%(message)s"
    datefmt = '%Y-%m-%d %H:%M:%S'
    
    formatter = logging.Formatter(format_str, datefmt)
    handler1.setFormatter(formatter)
    handler2.setFormatter(formatter)
    
    logger.addHandler(handler1)
    logger.addHandler(handler2)
    
    a = 5
    b = 0
    try:
        c = a / b
        logger.info('This is an info message')
    except Exception as e:
        # 下面三种方式三选一，推荐使用第一种
        # logging.exception("Exception occurred")
        # logging.error("Exception occurred", exc_info=True)
        # logging.log(level=logging.DEBUG, msg="Exception occurred", exc_info=True)
        logger.error('This is an error message')

来源:[https://blog.csdn.net/tangwendi/article/details/94843555][https_blog.csdn.net_tangwendi_article_details_94843555]

[https_blog.csdn.net_tangwendi_article_details_94843555]: https://blog.csdn.net/tangwendi/article/details/94843555