python pygame 愤怒的小鸟 （学习阶段-感谢支持）

import pygame,sys
pygame.init()#初始化操作
#保存窗口大小
width,height=600,400
screen=pygame.display.set_mode([width,height])#创建游戏窗口
#设置窗口标题
pygame.display.set_caption("愤怒的小鸟")
#加载小鸟素材
player=pygame.image.load("xiaoniao.png")
#获取图像矩形位置
rect=player.get_rect()
#声明XY运动速度的列表
speed = [3,2]
left_head = pygame.transform.flip(player,True,False)
right_head = player
#无限循环
while True:
    for event in pygame.event.get():
        if event.type ==pygame.QUIT:
            exit()
        if event.type ==pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                player = left_head #小鸟的头向左
                speed=[-2,1]
            if event.key == pygame.K_RIGHT:
                player = right_head #小鸟的头向左
                speed=[2,1]
            if event.key == pygame.K_UP:
                player = left_head #小鸟的头向左
                speed=[2,-1]
            if event.key == pygame.K_DOWN:
                player = right_head #小鸟的头向左
                speed=[2,1]
    rect =rect.move(speed)
    if rect.right>width or rect.left<0:
        #将图片水平翻转             反转对象 是否水平反转 是否垂直翻转
        player = pygame.transform.flip(player,True,False)
        speed[0]=-speed[0]
    if rect.bottom>height or rect.top<0:
        speed[1]=-speed[1]
    screen.fill((255,255,255))
    screen.blit(player,rect)
    pygame.display.update()
    pygame.time.delay(10)