auto save

snake.py

@@ -56,8 +56,9 @@ while True:
         y += 30
     position.append((x, y))
     if apple_x==x and apple_y==y:
-        apple_x=random.randint(0,660)
-        apple_y=random.randint(0,480)
+        apple_x=(random.randint(1,22)-1)*30
+        apple_y=(random.randint(1,16)-1)*30
+    else:    
         position.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))