Elementary Cellular Automata in Python 20 lines, Rules from 1 to 255

eca.py

from time import sleep

cnum, step, r, b, = 150, 50, {}, (False,True)
g = [(x,y,z) for x in b for y in b for z in b]

for rule in range(1,256):
    n = [int(x) for x in format(rule, '08b')]
    for i in range(8): r[g[i]] = n[7-i]
    c, cn = [False]*cnum, [False]*cnum
    c[cnum//2] = 1

    for _ in range(step):
        print(''.join(['*' if e else ' ' for e in c]))
        for i in range(cnum):
            x = False if i == 0      else c[i-1]
            y = c[i]
            z = False if i == cnum-1 else c[i+1]
            cn[i] = r[(x,y,z)]
        for i in range(cnum): c[i] = cn[i]
        sleep(0.01)