auto save

snake.py

 import pygame
 from pygame import locals
 
+#初始化pygame，为使用硬件做准备
 pygame.init()
+#载入图片
+bg = pygame.image.load('bg.png')#背景图片
+right = pygame.image.load('right.png')
+apple = pygame.image.load('apple.png')
 
-screen = pygame.display.set_mode((640,480))
-
+screen = pygame.display.set_mode((660,480))
 while True:
     for event in pygame.event.get():
         print(event)
         if event.type == locals.QUIT:
+            #接收到程序后退出事件
             exit()
+    #将背景图片画上去
+    screen.blit(bg,(0,0))
+    #刷新画面
+    pygame.display.update()
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