Python Logger 类不打印日志的实现

Question

我扩展了下面给出的 python 记录器类：

class CommonLogger(Logger):

    def debug(self, *args):

        self.check_and_log(10, args)

    def info(self, *args):

        self.check_and_log(20, args)

    def warn(self, *args):

        self.check_and_log(30, args)

    def error(self, *args):

        self.check_and_log(40, args)

    def check_and_log(self, level, args):

        if self.isEnabledFor(level):

            log_str = self.convert_list_to_string(args)

            super().log(level, log_str)

    @staticmethod

    def convert_list_to_string(args):

        return ''.join(str(msg) for msg in args)

然后在每个使用它的类中创建一个记录器，如下所示：

self.logger = CommonLogger(logging.getLogger(Constants.LOGGER_NAME))

self.logger.info('starting logger: ' + str(Constants.LOGGER_NAME))

但是当我运行它时，它不会抛出错误 - 但它也不会在控制台上打印任何日志。知道为什么吗？

更新：我将其与打印日志的正常流程进行了比较 - 当它作为 Logger 类的实现创建时，我的logging.handlers似乎没有在 Logger 类中初始化（空列表）。

handlers = {list} <class 'list'> []

在正常流程中 - 处理程序的填写如下：

handlers = {list} <class 'list'>: [<StreamHandler <stdout> (INFO)>, <RotatingFileHandler D:\y\logs\engine.log (INFO)>]

 0 = {StreamHandler} <StreamHandler <stdout> (INFO)>

 1 = {RotatingFileHandler} <RotatingFileHandler D:\y\logs\engine.log (INFO)>

 __len__ = {int} 2

有什么建议么？

Answer 1

这最终解决了我的问题：class Message(object):&nbsp; &nbsp; def __init__(self, fmt, args):&nbsp; &nbsp; &nbsp; &nbsp; self.fmt = fmt&nbsp; &nbsp; &nbsp; &nbsp; self.args = args&nbsp; &nbsp; def __str__(self):&nbsp; &nbsp; &nbsp; &nbsp; return self.fmt + ''.join(str(arg) for arg in self.args)class CommonLoggerAdapter(logging.LoggerAdapter):&nbsp; &nbsp; def __init__(self, logger, extra=None):&nbsp; &nbsp; &nbsp; &nbsp; super(CommonLoggerAdapter, self).__init__(logger, extra or {})&nbsp; &nbsp; def log(self, level, msg, *args, **kwargs):&nbsp; &nbsp; &nbsp; &nbsp; if self.isEnabledFor(level):&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; msg, kwargs = self.process(msg, kwargs)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; self.logger._log(level, Message(msg, args), (), **kwargs)显然，使用适配器实现而不是记录器实现效果更好，因为 logging.config 在它们之间共享。如果要使用 Logger 实现，则需要在初始化时执行此操作：def __init__(name):&nbsp; &nbsp; for handler in logging._handlers.values():&nbsp; &nbsp; &nbsp; &nbsp; self.addhandler(handler)这两个选项都有效！希望它也对其他人有所帮助！