On Fri, 20 Aug 2010 06:10:59 pm Alan Gauld wrote: > "Steven D'Aprano" <st...@pearwood.info> wrote > > > the purpose). No matter how fast you can perform a loop, it's > > always faster to avoid it altogether, so this: > > > > seq = xrange(10000000) > > result = [] > > for i in seq: > > if i >= 10: break > > result.append(i%2) > > > > > > will be much faster than this: > > > > seq = xrange(10000000) > > result = [i%2 for i in seq if i < 10] > > Although it should be pointed out that these are doing very different > things.
Well yes, but I pointed out that you *can* bail out early of for-loops, but not list comprehensions. The whole point is with a list comp, you're forced to iterate over the entire sequence, even if you know that you're done and would like to exit. -- Steven D'Aprano _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
