[Python-Dev] Re: Dangerous exceptions (was Re: Another test_compiler mystery)

[David Eppstein]

In article <ca471dc2040906184648d95e55 at mail.gmail.com>,
 Guido van Rossum <gvanrossum at gmail.com> wrote:

> > It's not really the same subject, but the exception that gives me the
> > most grief is StopIteration.  I have to keep remembering to never call
> > .next() without catching it; if I forget, I get bugs where some loop
> > several levels back in the call tree mysteriously exits.
> 
> Are you sure? This sounds like superstition to me, since that's not
> how loops work. Raising StopIteration in the middle of a loop does not
> break out of the loop -- only raising StopIteration from a next()
> breaks a loop.
> 
> Or are you talking about nested next() calls? That's the only case
> where the behavior you are citing occurs.

I don't remember, it could have been nested next()s.

-- 
David Eppstein
Computer Science Dept., Univ. of California, Irvine
http://www.ics.uci.edu/~eppstein/