save project

snake.py

@@ -60,6 +60,7 @@ while True:
         num2=random.randint(1,16)
         apple_x=num1*30-30
         apple_y=num2*30-30
+    else:
         position.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))