本学习笔记参考于https://www.runoob.com/python/python-functions.html和https://blog.csdn.net/scott198510/article/details/98198312本学习笔记参考于https://www.runoob.com/python/python-fun
阅读背景：
一行一行学python&一行一行敲KNN
来源：互联网
分享到：
