save project

snake.py

@@ -60,8 +60,8 @@ while True:
         num2 = random.randint(1,16)
         apple_x = 30 * num1-30
         apple_y = 30 * num2-30
-        
-    position.pop(0)
+    else:       
+        position.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去