On Sat, May 27, 2017 at 12:19 PM, Steve D'Aprano <steve+pyt...@pearwood.info> wrote: > On Sat, 27 May 2017 09:37 am, Chris Angelico wrote: > >> On Sat, May 27, 2017 at 8:56 AM, Larry Martell <larry.mart...@gmail.com> >> wrote: >>> If they write a loop with range(1,10) they are going in the 'no' pile. >>> If they write a loop with range(1,11) they go in the maybe pile >>> If the write sum([i*i for i in range(1,11)]) and sqrt(sum([i for i in >>> range(1,11)])) they are going in the yes pile. >> >> And if they leave off the square brackets, even better. :) > > If they leave out the square brackets, the code might be slower. > > I know that ''.join() is about 30% faster with a list comprehension than a > generator expression, but I'm not sure about sum().
That's probably because "".join() can do two passes over a list, one to sum the lengths and one to actually copy data. But summing integers can be done without. That said, though, empirical testing seems to show that the comprehension is a bit faster. My guess is that that would change on larger data sets though. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
