[Tutor] cyclically rotate a list.

[kevin parks]

How does one cyclically rotate a list (of arbitary size)
so that given a list x= [0, 1, 2, 3, 4, 5, 6] one could say:
rotate(x, y=0) -->[0, 1, 2, 3, 4, 5, 6]
rotate(x, y=1) -->[1, 2, 3, 4, 5, 6, 0]

yeilding list like so (with y going modulo the list size 
i suppose):

[0, 1, 2, 3, 4, 5, 6]
[1, 2, 3, 4, 5, 6, 0]
[2, 3, 4, 5, 6, 0, 1]
[3, 4, 5, 6, 0, 1, 2]
.
.
.
[6, 0, 1, 2, 3, 4, 5]
[0, 1, 2, 3, 4, 5, 6]


I am hurting my brain on this one.


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