Simple if-else question

Terry Reedy tjreedy at
Wed Sep 30 10:03:59 CEST 2009

John Yeung wrote:
> On Sep 29, 1:15 pm, Carl Banks <pavlovevide... at> wrote:
>> Hmm, I wonder if Python should emit a warning if an else is
>> used on a for block with no break inside.  I don't think the
>> else can be invoked in any other way.  As a bonus it could
>> catch some cases where people mistakenly use it thinking it
>> will execute [only] when there are no iterations.
> [Edit from Duncan Booth]
> I would definitely be in favor of a warning.  Yes, people should read
> the docs more carefully, and yes, it would cost a certain amount of
> annoyance to implement this.  But I don't think it would get in
> people's way if they do know how to use else, and I think it would cut
> down on the number of questions from mystified beginners, some of whom
> are much more aggressive than this particular OP about claiming that
> Python is broken (when it's actually behaving as designed).

This sort of warning is appropriate for code checkers like Pylint, 
Pychecker, but not for the running interpreter.


More information about the Python-list mailing list