通过生成器写一个日志调用方法-优快云博客

本文介绍了一种使用Python协程实现的日志记录系统，该系统可以将消息同时输出到控制台和文件中，适用于需要实时监控和持久化日志的应用场景。

要求：

代码：

import logging


def logging_data(filename, channel='terminal'):
    logger = logging.getLogger()
    logger.setLevel(logging.DEBUG)

    ch = logging.StreamHandler()
    ch.setLevel(logging.DEBUG)

    fh = logging.FileHandler(filename)
    fh.setLevel(logging.DEBUG)

    formatter = logging.Formatter('%(asctime)s %(message)s')

    ch.setFormatter(formatter)
    fh.setFormatter(formatter)
    count = 0
    while True:
        count += 1
        msg = yield count
        if msg and channel == 'terminal':
            logger.addHandler(ch)
            logger.info('[{0}] {1}'.format(count, msg))
        elif msg and channel == 'file':
            logger.addHandler(fh)
            logger.info('[{0}] {1}'.format(count, msg))
        elif msg and channel == 'both':
            logger.addHandler(ch)
            logger.addHandler(fh)
            logger.info('[{0}] {1}'.format(count, msg))
        else:
            exit('输入不合法')


log_obj = logging_data('web.db', 'both')

next(log_obj)
log_obj.send('user alex login success')
log_obj.send('user wusir login success')
log_obj.send('user haifeng login success')