Wolfram's 2-state 3-symbol Turing Machine

w23tm-ds.py

# Wolfram's 2-state 3-symbol Turing Machine

from time import sleep

delta = {1: {0: (1,  1, 2), 1: (2, -1, 1), 2: (1, -1, 1)},
         2: {0: (2, -1, 1), 1: (2,  1, 2), 2: (0,  1, 1)}}
ds = {0: ' ', 1: '.', 2: '*'}

tlen = 80
tape, head, state = [0] * tlen, int(tlen / 2) - 9, 1

while 0 <= head < tlen:
    t = delta[state][tape[head]]
    tape[head], head, state = t[0], head + t[1], t[2]
    for s in tape: print(ds[s], end='')
    print()
    sleep(0.005)