Stephen Wolfram's chaos generator based on the https://en.wikipedia.org/wiki/Rule_30

rule30_order_and_chaos.py

#!/usr/bin/env python
# -*- coding: utf -*-
S = "-"*70 + u"█" + "-"*80
for x in range(100):
    print S
    Q = "-"
    for l in range(1, len(S)-1):
        a, b, c = S[l-1]==u"█", S[l]==u"█", S[l+1]==u"█"
        if (a and not b and not c) or (not a and b and not c) or (not a and not b and c) or (not a and b and c):
            Q = Q+u"█"
        else:
            Q = Q+"-"
    Q = Q+"-"
    S = Q