When n is positive, rotate the elements in l n places to the right. When n is negative, rotate the elements in l n places to the left.
abjad> l = range(10)
abjad> listtools.rotate(l, -3)
[3, 4, 5, 6, 7, 8, 9, 0, 1, 2]
abjad> listtools.rotate(l, 4)
[6, 7, 8, 9, 0, 1, 2, 3, 4, 5]