My poor understanding is that the difference between `sorted(somelist, key=lambda x:...)` and `somelist.sort(lambda x,y...)` is that one returns a new list and the other sorts in-place.
Does that mean that .sort() is more efficient and should be favored when you can (i.e. when you don't mind changing the listish object)? -- http://mail.python.org/mailman/listinfo/python-list
