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

David Eppstein eppstein at ics.uci.edu
Tue Sep 7 17:31:41 CEST 2004

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

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