[Python-Dev] Re: PEP 282 comments (original) (raw)

Kevin Butler kbutler@campuspipeline.com
Fri, 22 Mar 2002 11:22:55 -0700

Following up on my own message:

[Kevin Butler]

the "simple subclass" now just needs to override log to do advanced things with other optional arguments.

I realized that this is a significant issue. In library design, the "Open-Closed" principle is really important - the code should be open to extension, but is closed to modification.

By adding the **kwargs to the convenience methods, the Logger opens itself to change and enables all subclasses to extend the interface by overriding _log with more keyword arguments. Without **kwargs, subclasses have to override _log and every one of the convenience methods (1.5K of duplicated code).

Setting-myself-up-for-YAGNI-ly y'rs,

kb