理解不透彻，下回分解
http://www.cnblogs.com/pengsixiong/p/5326893.html
https://blog.csdn.net/zhao_crystal/article/details/82620524
python之dict与set实现原理之hash算法
转载于:https://www.cnblogs.com/raind/p/10134546.html
http://www.cnblogs.com/pengsixiong/p/5326893.html
https://blog.csdn.net/zhao_crystal/article/details/82620524
转载于:https://www.cnblogs.com/raind/p/10134546.html