http://www.runoob.com/python/python-func-reduce.html
https://www.liaoxuefeng.com/wiki/001374738125095c955c1e6d8bb493182103fac9270762a000/00141861202544241651579c69d4399a9aa135afef28c44000
http://www.cnblogs.com/zhoujinyi/archive/2013/06/07/3121976.html
注意与pandas中map函数的对比
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