pi.util.Array.rotate(array,value)
>>> pi.util.Array.rotate([1,2,3],-1) [2,3,1] >>> [pi.util.Array.rotate([1,2,3],-2) [3,1,2] >>> pi.util.Array.rotate([1,2,3],1) [3,1,2] >>> pi.util.Array.rotate([1,2,3],1) [2,3,1]