where should I look for sys.stderr output?

[Steve Canfield]

Okay- this probably seems like a really dumb question, but I've been
stuck on it for a little while now...

I have a MoinMoin wiki that I've been playing with. Somehow, I broke
the attach file function. When I click on the "Attach File" link, I
get a SyntaxError: invalid syntax page. The offending line is:
 text = ' print >>sys.stderr, "save_drawing: tainted path \'%s\',
aborting!" % filename\012'

How do I figure out where sys.stderr messages end up? This is running
on a RedHat 7.3 machine.