Generate random symmetric sprites in the terminal

sprite.py

#!/usr/bin/env python
# Inspired by this tweet: https://twitter.com/AtticusBones/status/787936821892317184

from __future__ import division

import atexit
import curses
import math
import random
import sys
import time

W = 8
H = 8

COLOR = random.randint(1, 7)
MUTATION_COUNT = random.randint(1, 5)

c = int(math.ceil(W/2))
d = int(W/2)

sprite = {(x, y): random.randint(0, 1) for x in range(c) for y in range(H)}
mutations = [(random.randint(0, d), random.randint(0, H-1)) for x in range(MUTATION_COUNT)]

def mirror(x):
    return d - (x - c + 1)

for y in range(H):
    for x in range(c, W):
        sprite[(x,y)] = sprite[(mirror(x), y)]

stdscr = None

def pr(sprite):
    for y in range(H):
        for x in range(W):
            if sprite[(x,y)] > 0:
                stdscr.addstr("  ", curses.color_pair(1))
            else:
                stdscr.addstr("  ", curses.color_pair(0))
        stdscr.addstr("\n")
    stdscr.refresh()

def mutate(sprite):
    for mutation in mutations:
        x, y = mutation
        sprite[(x, y)] = 1 - sprite[(x, y)]
        sprite[(mirror(x), y)] = 1 - sprite[(mirror(x), y)]



@atexit.register
def goodbye():
    curses.nocbreak()
    if stdscr:
        stdscr.keypad(0)
    curses.echo()
    curses.endwin()

stdscr = curses.initscr()
curses.start_color()
curses.init_pair(1, curses.COLOR_BLACK, COLOR)
curses.curs_set(0)

while True:
    stdscr.clear()
    pr(sprite)
    mutate(sprite)
    time.sleep(0.3)