python pygame 生命的游戏

import sys
import pygame
import random

# 参数设置
box_w, box_h = 10, 10 # 盒子宽高
window_w, window_h = 400, 400
x, y = 0,0
#使用pygame之前必须初始化
pygame.init()

#设置主屏窗口
screen = pygame.display.set_mode((400,400))

#设置窗口标题
pygame.display.set_caption('')
# 如果没有下列主循环代码，运行结果会一闪而过

def checks(x, y):
    n = 0 # 周围细胞个数
    L = x+box_w,y
    R = x-box_w,y
    U = x,y-box_h
    D = x,y+box_h
    ul = x+box_w,y-box_h
    ur = x-box_w,y-box_h
    dl = x+box_w,y+box_h
    dr = x+box_w,y+box_h
    d = [L, R, U, D, ul, ur, dl, dr]
    for i in d:
        if i in Cells:
            n += 1
    # 过于拥挤 n >= 4
    if n >= 4:
        Cells.remove([x,y])
    # 过于孤独 n <= 1
    elif n <= 1:
        Cells.remove([x,y])
    # 保持存活 2 <= n < 3
    elif 2 <= n < 3:
        pass
    # 细胞繁衍 n = 3
    elif n == 3:
        while 1:
            x,y = random.choice(d)
            if [x,y] not in Cells:
                print(x,y)
                Cells.append([x,y])
                break

# 细胞群
Cells = []
for t in range(100):
    i = random.randint(0,int(window_w/box_w))
    j = random.randint(0,int(window_h/box_h))
    x, y = i*box_w,j*box_h
    Cells.append([x, y])

# 更新屏幕内容
pygame.display.flip()
while True:
    # #填充主窗口的背景颜色，参数值RGB（颜色元组）
    screen.fill((255, 255, 255))
    # 循环获取事件，监听事件
    for event in pygame.event.get():
        # 判断用户是否点了关闭按钮
        if event.type == pygame.QUIT:
            #卸载所有模块
            pygame.quit()
            #终止程序
            sys.exit()

    # 矩形
    for x,y in Cells:
        pygame.draw.rect(screen, (255, 0, 255), (x, y, box_w, box_h),width=0)
        checks(x,y)

    # 竖向
    for i in range(int(window_h/box_w)):
        pygame.draw.line(screen, (1, 1, 1), (box_w * i, 0), (box_w * i, window_h), 2)
    # 横向
    for j in range(int(window_w/box_h)):
        pygame.draw.line(screen, (1, 1, 1), (0, box_h * j), (window_w, box_h * j), 2)

    screen.blit(screen, (0, 0))
    # 定义频率
    clock = pygame.time.Clock()
    # 设定刷新帧率
    clock.tick(1) # 越大刷新的越快
    pygame.display.update()