如何在Python的日志记录模块中使用现代字符串格式设置选项? [英] How to use modern string formatting options with Python's logging module?

问题描述

Python日志记录教程说，从不格式化方法超出了本教程的范围，没有提及从何处学习.

The Python logging tutorial says that the never ways of formatting are beyond the scope of the tutorial, without mentioning where to learn about it.

对于任何允许我在记录调用(例如debug()，info()等)中使用.format()样式的消息格式的示例/文档，我将不胜感激.

I would appreciate any examples/documentation that allow me to use .format() style message formatting in logging calls such as debug(), info(), etc.

推荐答案

最近，我也在寻找它.我想我已经指出了SO上的解决方案，但是我手头只有最终的URL.这就是我要做的:

Recently, I was looking for that too. I think I got pointed to the solution here on SO, but I only have the final url at hand. This is what I do:

# http://plumberjack.blogspot.de/2010/10/supporting-alternative-formatting.html
class BraceMessage(object):
    def __init__(self, fmt, *args, **kwargs):
        self.fmt = fmt
        self.args = args
        self.kwargs = kwargs

    def __str__(self):
        return self.fmt.format(*self.args, **self.kwargs)

_F = BraceMessage

可以这样使用:

logger.debug(_F("foo {0} {quux}", bar, quux=baz))

格式化仅在评估邮件的那一刻进行，因此，如果禁用日志级别，则不会损失很多性能.上面那个代码片段的作者将此软件包(和其他一些实用程序)作为软件包提供了: logutils .

The formatting will only take place in the very moment the message is evaluated, so you don't lose lots of performance if a log level is disabled. The author of that snippet above made this (and some other utilities) available as a package: logutils.

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