save project

snake.py

@@ -52,7 +52,7 @@ while True:
     if x == apple_x and y == apple_y:
         num1 = random.randint(1,21)
         num2 = random.randint(1,16)
-    
+    position.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去