save project

snake.py

@@ -59,8 +59,11 @@ while True:
         num2 = random.randint(0,16)
         apple_x=30*num1 - 30
         apple_y=30*num2 - 30
+    else:
+         position.pop(0)
+        
 
-    position.pop(0)
+   
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去