在我童年的记忆中，有一个身影始终挥之不去——那就是住在我隔壁的妹妹小芳，她不仅是我儿时的玩伴，更是见证彼此成长的重要人物，我想讲述一下这位与我共度时光的“隔壁妹妹”的故事。

小时候的小区里，我和小芳的家仅由一道薄薄的墙壁隔开，我们常常通过敲打这堵墙来传递信号、约定玩耍的时间和地点；这种简单而纯真的交流方式构成了我们童年友谊的独特印记，那时的她总是扎着两个羊角辫，眼睛大大的像星星一样闪烁光芒，脸上总是挂着天真无邪的笑容和对世界的好奇与期待，每当放学后或周末来临之际，“咚咚咚——”的敲墙声就会响起—那是属于我们的摩斯密码般独特的沟通手段，我们会一起捉迷藏、“过家家”，还会分享各自在学校里的趣事和小秘密；有时候也会因为争抢玩具或者意见不合闹些小孩子脾气,但很快就能够和好如初继续开心地笑作一团……这些美好回忆仿佛就发生在昨天一般清晰可辨且令人怀念不已！现在回想起来仍觉得温暖如春阳照耀心田呢! 时光荏苒岁月流转间我们都已长大成人了啊~ 但那份纯真无暇的情谊却依旧没有改变分毫哦!!

小时候的我总觉得时间很慢长大多么遥不可及呀 ! 然而转眼间十几年光阴匆匆而过 ; 当初那个稚嫩可爱的小女孩如今也出落得亭亭玉立了呢 ~ 虽然我们已经不再是每天都能见面的邻居小伙伴了但是每次偶遇总会聊起往昔共同度过的快乐时光 …… 现在偶尔想起那些年少轻狂的岁月心中仍旧泛起阵阵涟漪 。。，也许这就是青春最美好的回忆吧？！！即使随着时间的流逝很多东西都在悄然发生改变但是有些情感却永远不会褪色反而会随着时间推移变得更加深厚浓郁起来 ~~~ 就如同那陈年老酒越品越有味儿一样呵 !!! 所以珍惜眼前人莫让青葱岁月成空白才是我们应该做的事情喔 !!!!

随着年岁的增长和生活轨迹的变化我与小芳之间的联系虽然逐渐减少了许多 , 可每当我们有机会碰面依旧会兴奋地谈起过去一同经历的点点滴滴 . 那些关于友情亲情以及成长的记忆片段总能在某个不经意的瞬间被唤醒并让我们心生感慨万分 ….. 也许正是因为有了距离才使得这份情谊显得更加珍贵难得 !! 因此无论何时何地只要回想起那段无法忘怀的青涩年华都会让我感到无比温暖和幸福满满哒!!!!!! 即使现在我们的人生阶段和需求不同了但是我们之间的情感纽带却始终如一地紧紧相连从未断裂过的感觉真好!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 在这个世界上有些东西是无法用言语来表达清楚的比如感情就是这样一种存在它超越了时间和空间的限制成为了永恒的主题之一 ........................................................................................................................................................... 我们都是人生旅程中的过客然而有幸能与某些人结伴同行一段路程已经足够幸运啦~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~```所以请珍惜与小伙伴相处的每一刻因为这些都将变成未来宝贵的财富哟 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def factorial(n):
    if n == 0 or n == 1:
        return 1
    else:
        return n * factorial(n-1)
print("5 的阶乘为:", factorial(5)) # 输出应为 "5 的阶乘为: 120"

这个程序定义了一个名为factorial()的函数来计算一个数的阶乘（即该数与所有小于它的正整数相乘的结果），然后调用这个函数计算数字5的阶乘并将结果打印出来. 请解释