Python中下划线的5种含义
https://blog.csdn.net/tcx1992/article/details/80105645
Python 中 property() 函数及 @property 装饰器的使用
https://blog.csdn.net/jpch89/article/details/84026130
Python中的动态属性和特性
https://blog.csdn.net/weixin_34343000/article/details/88841869
http://www.360doc.com/content/19/1028/15/40585874_869558606.shtml
Python中 super() 函数详解
https://www.cnblogs.com/miyauchi-renge/p/10923127.html
