Yes, twistd doesn't appear to work on py3k. Not being able to import _preamble is normal (once Twisted has been installed), but _preamble does assume sys.exc_clear exists, which isn't true on 3.x.

I couldn't find any ticket on this. Perhaps you should file it (and maybe fix it!) :)

It's my understanding that the new except clause semantics are expected to take care of this problem.

Can someone comment as to why this was put there in the first place, and, specifically, why it can't just be "pass"? Is there some logging system that looks at the current exception or something when twistd (or some other script) starts?

cheers
lvh