1d cyclic cellular automaton

cycal.py

from random import randrange
from PIL import Image

colortrans = [
	(255,0,0),
	(255,127,0),
	(255,255,0),
	(127,255,0),
	(0,255,0),
	(0,255,127),
	(0,255,255),
	(0,127,255),
	(0,0,255),
	(127,0,255),
	(255,0,255),
	(255,0,127)
]

n = 4
w = 1920
it = 1080

state = [randrange(0,n) for x in range(w)]
pxdata = state

def bound(n,k):
	if n == k:
		return 0
	else:
		return n

for i in range(it-1):
	nstate = [0]*w

	for i in range(0,w):
		ng = [state[(i+j) % w] for j in [-1,1]]

		if bound(state[i]+1, n) in ng:
			nstate[i] = bound(state[i]+1, n)
		else:
			nstate[i] = state[i]
	
	pxdata += nstate
	state = nstate


pxdata = [colortrans[x] for x in pxdata]

outimg = Image.new("RGB", (w, it))
outimg.putdata(pxdata)

outimg.save("CyclicCA.png")