Friends,
I have a list. I have to do some comparison of each item in the list with
each other items in the list.

from numpy import zeros
a=zeros((5,5))

myres=['R', 'N', 'L', 'C', 'M']
DON=['R','N','L'] ; ALL=['R','L','M','S']

for x in myres:
        for y in myres:
                if x in DON:
                          if y in ALL: a[res.index(x),res.index(y)] = 1
                 else: continue

But here the value of y changes sequentially. I want y to cycle through the
list something like the following. Is there any function to do such circular
iteration.
cycle 1 y's value should be 'N', 'L', 'C', 'M, 'R'  index 1,2,3,4,0 of myres
cycle 2 y's value should be 'L', 'C', 'M, 'R', 'N'  index 2,3,4,0,1       ,,
cycle 3 y's value should be  'C', 'M', 'R', 'N','L' index 3,4,0,1,2       ,,

Thank you,
Bala
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