save project

snake.py

@@ -60,8 +60,10 @@ while True:
         C2=random.randint(1,16)
         apple_x=C1*30-30
         apple_y=C2*30-30
-    position.append((x, y))
+    else:
         position.pop(0)
+    position.append((x, y))
+
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去