A Lifegame for Python (requires Pygame)

lifegame.py

import pygame, sys, random
from copy import deepcopy
pygame.init()
size = (800,450)
white = (255, 255, 255)
color = (30, 30, 180)
fps = 30
screen = pygame.display.set_mode(size)
pygame.display.set_caption('lifegame')

cellsize = 8
width, height = [x/cellsize for x in size]
cells = [[(True, False)[random.randint(0,1)] for x in xrange(width)] for y in xrange(height)]
cells_swp = deepcopy(cells)
clock = pygame.time.Clock()
stop = False

def get_alive(x, y):
  cnt = 0
  for i in xrange(-1, 2):
    for j in xrange(-1, 2):
      if x+i==-1 or x+i==width or y+j==-1 or y+j==height or (i==0 and j==0): continue
      cnt += 1 if cells_swp[y+j][x+i] else 0
  return cnt

while True:
  clock.tick(fps)
  for e in pygame.event.get():
    if e.type == pygame.QUIT: sys.exit()
    elif e.type == pygame.KEYDOWN and e.key == pygame.K_SPACE: stop = not stop
  if stop: continue
  screen.fill(white)
  for y in xrange(height):
    for x in xrange(width):
      alive = get_alive(x, y)
      if alive == 3 and not cells_swp[y][x]: cells[y][x] = True
      if alive <= 1 or alive >= 4: cells[y][x] = False
      if cells[y][x]: pygame.draw.rect(screen, color, pygame.Rect(x*cellsize, y*cellsize, cellsize, cellsize))
  cells_swp = deepcopy(cells)
  pygame.display.flip()