Alan Gauld wrote: > "wesley chun" <[EMAIL PROTECTED]> wrote > > >> the solutions using LCs above are great when it comes to an >> expressive >> piece of code in a one-liner, but i feel there's a waste of >> time/memory. the use of GEs is better, but it still has to iterate >> over the entire string when i don't feel that it should be necessary >> > > One of my only peeves with LCs is that they always iterate to the end, > I'd like an optional extra 'until' clause, like: > > lst = [n for n in veryBigSequence if someTest(n) until anotherTest(n)] > > This would act as usual until the final expression was true at which > point it would stop iterating. > How about:
lst = [n for n in itertools.takewhile(anotherTest(), veryBigSequence] if someTest(n)] # reverse the logic of anotherTest > If I could find the time/inclination I might even try throwing it in > as > a PEP sometime... > > I don't think it would break much old code because (a) its an optional > extra at the end of the LC and (b) 'until' isn't used in Python so > far... > > Alan G. > > > _______________________________________________ > Tutor maillist - Tutor@python.org > http://mail.python.org/mailman/listinfo/tutor > > -- Bob Gailer 510-978-4454 Oakland, CA 919-636-4239 Chapel Hill, NC _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
