save project

snake.py

 import pygame
-
+from pygame important locals
 # 初始化pygame，为使用pygame做准备
 pygame.init()
 
@@ -9,5 +9,7 @@ screen=pygame.display.set_mode((800,600))
 while True:
     for event in pygame.event.get():
         if event.type==locals.QUIT:
-
-           exit()
\ No newline at end of file
+  
+           exit()
+    screen.bilt(background,(0,0))
+    pygame.display.update()       
\ No newline at end of file