python test frameworks

[Quinn Dunkan]

I know this sort of thing has been talked about before, but I'm looking for
some information on techniques for self-testing pyhon code (something I
should have been doing before, but only now am I writing a system complex
enough to warrant it).  I remember Tim's thread about his doc-string embedded
testing, and that looked interesting, but I can't find it now.  And links to
discussions of the merits of different strategies would be good, too.

thanks