I noticed that the "A test of `multiprocessing.Pool` class" at (http://docs.python.org/3/library/multiprocessing.html#examples) doesn't seem to work as expected. I'm using Python 3.3 on Windows. I saved the example and ran it. It gives the correct output until the "Testing callback" section. The map_async function doesn't seem to be written properly. I was confused about why the program I was writing didn't work until I realized the example might be wrong. If I can figure out a workaround I will write back, but otherwise I hope the example can be fixed by someone smarter than me. Thanks, -Bo Testing callback: *** callbacks failed [56] != [56, 0, 1, 8, 27, 64, 125, 216, 343, 512, 729]