Help with generators outside of loops.
eppstein at ics.uci.edu
Wed Dec 8 01:34:37 CET 2004
In article <mailman.7340.1102463745.5135.python-list at python.org>,
"Robert Brewer" <fumanchu at amor.org> wrote:
> > But I'm guessing that you can't index into a generator as if
> > it is a list.
> row = obj.ExecSQLQuery(sql, args).next()
I've made it a policy in my own code to always surround explicit calls
to next() with try ... except StopIteration ... guards.
Otherwise if you don't guard the call and you get an unexpected
exception from the next(), within a call chain that includes a for-loop
over another generator, then that other for-loop will terminate without
any error messages and the cause of its termination can be very
difficult to track down.
Computer Science Dept., Univ. of California, Irvine
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