save project

snake.py

@@ -5,10 +5,12 @@ from pygame import locals
 
 # 初始化pygame，为使用pygame做准备
 pygame.init()
-
+background=pygame.image.load("bg.png")
 # 创建一个窗口
 screen = pygame.display.set_mode((660,480))
 while True:
     for event in pygame.event.get():
         if event.type==locals.QUIT:
-            exit()
\ No newline at end of file
+            exit()
+    screen.blit(background,(0,0))
+    pygame.display.update()   
\ No newline at end of file