Those things return generators now to avoid wasting memory (you don't need to create possibly humongous list and keep it in memory during the iteration). If you

Those things return generators now to avoid wasting memory (you don't need to create possibly humongous list and keep it in memory during the iteration). If you want a list, just do list(your expression). If you forgot about it then do: list(_) as the very next thing. Like this: >>> map(lambda x: x*x, range(1,10)) <map object at 0x02DDDB90> >>> list(_) [1, 4, 9, 16, 25, 36, 49, 64, 81] Wtp ?