no-clobber dicts?

[alex23]

Steven D'Aprano <ste... at REMOVE.THIS.cybersource.com.au> wrote:
> I also have a series of unit tests for it if you're interested in them.

That's several times today that kj has asked a question and you've
responded with ready-to-go code. If this was Stackoverflow, I'd accuse
you of reputation-whoring...

You _can_ just post your cool code without the double act, y'know! :)