Wolfram's 2-state-3-symbol Turing Machine in Python

wolfram.py

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)
  }
}

chars = {
  0: ' ',
  1: '.',
  2: '*'
}

len_tape = 80
tape, head, state = [0] * len_tape, len_tape // 2 - 9, 1

while 0 <= head < len_tape:
  next = delta[state][tape[head]]
  tape[head], head, state = next[0], head + next[1], next[2]
  for s in tape:
    print(chars[s], end='')
  print()
  sleep(0.005)