我目前正在尝试右对齐 Python 记录器中的日志记录级别字段，以便输出如下:

[2011-10-14 13:47:51] [DEBUG] --- starting... (smtphandlers.py:96)
[2011-10-14 13:47:51] [INFO] --- first things first... (smtphandlers.py:97)
[2011-10-14 13:47:51] [WARNING] --- about to end... (smtphandlers.py:98)
[2011-10-14 13:47:51] [DEBUG] --- ending (smtphandlers.py:99)

看起来像:

[2011-10-14 13:47:51] [   DEBUG] --- starting... (smtphandlers.py:96)
[2011-10-14 13:47:51] [    INFO] --- first things first... (smtphandlers.py:97)
[2011-10-14 13:47:51] [ WARNING] --- about to end... (smtphandlers.py:98)
[2011-10-14 13:47:51] [   DEBUG] --- ending (smtphandlers.py:99)

第一个 block 的格式行是:

logging.Formatter("[%(asctime)s] [%(levelname)s] --- %(message)s (%(filename)s:%(lineno)s)", "%Y-%m-%d %H:%M:%S")

如果我知道最大级别长度为 8(例如:CRITICAL)，那么我将右对齐到 8 个空格。 我试图弄清楚如何实现这一目标。以下失败，因为“%(levelname)s”超过 8 个字符(替换直到稍后才会发生)。如果我使用“{0:>20}”.format“%(levelname)s”之类的东西，那么它可以工作，但这比我需要或想要的填充更多。

logging.Formatter("[%(asctime)s] [" + "{0:>8}".format"%(levelname)s" + "] --- %(message)s (%(filename)s:%(lineno)s)", "%Y-%m-%d %H:%M:%S")

缺少子类化Formatter，有人有办法实现吗？

最佳答案

像这样:

logging.Formatter("[%(asctime)s] [%(levelname)8s] --- %(message)s (%(filename)s:%(lineno)s)", "%Y-%m-%d %H:%M:%S")

https://stackoverflow.com/questions/7771912/