Carl Banks wrote: > [EMAIL PROTECTED] wrote: > > Paul Rubin wrote: > > > [EMAIL PROTECTED] writes: > > > > print sum( ([i]*n for i,n in enumerate(seq)), []) > > > > > > Wow, I had no idea you could do that. After all the discussion about > > > summing strings, I'm astonished. > > > > Me too ... despite what bearophile said, this is faster than the 2nd > > example. Nearly as fast as the original loop :) > > See if it's still faster if the original sequence is length 1000. > (Hint: it won't be.) Adding lists with sum has the same performance > drawback that adding strings does, so it should be avoided. > > sum is for adding numbers; please stick to using it that way. > > FWIW, the original loop looked perfectly fine and readable and I'd > suggest going with that over these hacked-up listcomp solutions. Don't > use a listcomp just for the sake of using a listcomp.
Thanks for that, Carl. I think that using the loop is probably what I'll end up doing. I had no idea that the listcomp thing would be quite a complicated as it is appearing. I had it in my mind that I was missing some obvious thing which would create a simple solution :) Mind you, there are some interesting bits and pieces of code in this thread! -- http://mail.python.org/mailman/listinfo/python-list
