python简单贪吃蛇开发

import sysimport randomimport pygamefrom pygame.locals import * # 目标方块的颜色 红色redColor = pygame.Color(255, 0, 0)# 游戏界面的背景颜色 纯黑色blackColor = pygame.Color(0, 0, 0)# 贪吃蛇的颜色 白色whiteColor = pygame.Color(255, 255, 255)  # 定义游戏结束的函数def gameOver():  pygame.quit()  sys.exit()  # 定义main函数def main():  # 初始化pygame  pygame.init()  # 定义一个控制速度的函数  fpsClock = pygame.time.Clock()  # 创建显示层  playSurface = pygame.display.set_mode((640,480))  # 界面的大小  pygame.display.set_caption('贪吃蛇')  # 初始化蛇的位置  snake_position=[100,100]   # 初始化蛇的长度  snake_body = [[100,100],[80,100],[60,100]]   # 初始化目标方块的位置  target_position = [300,300]   # 目标方块的状态  target_flag = 1   # 初始化一个方向  direction = 'right'  # 定义蛇的方向变量  changeDirection = direction   while True:    # pygame的交互模块和事件队列    for event in pygame.event.get():      # 是否推出      if event.type == QUIT:        pygame.quit()        sys.exit()      # 判断键盘事件      elif event.type == KEYDOWN:        if event.key == K_RIGHT:          changeDirection = 'right'        if event.key == K_LEFT:          changeDirection = 'left'        if event.key == K_UP:          changeDirection = 'up'        if event.key == K_DOWN:          changeDirection = 'down'        if event.key == K_SPACE:          pygame.event.post(pygame.event.Event(QUIT))     # 根据键盘反应确定方向    if changeDirection == 'left' and not direction == 'right':      direction = changeDirection     if changeDirection == 'right' and not direction == 'left':      direction = changeDirection     if changeDirection == 'up' and not direction == 'down':      direction = changeDirection     if changeDirection == 'down' and not direction == 'up':      direction = changeDirection      # 根据方向移动蛇头的坐标    if direction == 'right':      snake_position[0] += 20     if direction == 'left':      snake_position[0] -= 20     if direction == 'up':      snake_position[1] -= 20     if direction == 'down':      snake_position[1] += 20     # 蛇与自身的碰撞检测    for body in snake_body:      if snake_position[0] == body[0] and snake_position[1] == body[1]:        gameOver()     # 蛇移动    snake_body.insert(0,list(snake_position))       if snake_position[0] == target_position[0] and snake_position[1] == target_position[1]:      target_flag = 0    else:      # 如果没吃到，蛇尾弹出栈      snake_body.pop()     # 如果吃掉目标方块，重新生成一个目标方块    if target_flag == 0:      x = random.randrange(1,32)      y = random.randrange(1,24)      # 20*20的像素为一个小矩形      target_position = [int(x*20),int(y*20)]      target_flag = 1     # 绘制显示层    playSurface.fill(blackColor)     # 绘制蛇    for position in snake_body:      pygame.draw.rect(playSurface, redColor, Rect(position[0],position[1],20,20))     # 画目标方块    pygame.draw.rect(playSurface, whiteColor, Rect(target_position[0], target_position[1], 20, 20))     pygame.display.flip()     # 判断死亡    if snake_position[0] > 620 or snake_position[1] < 0:      gameOver()    elif snake_position[1] > 460 or snake_position[1] < 0:      gameOver()     # 控制游戏的速度    fpsClock.tick(5) if __name__ == '__main__':  main()