1.时间与时间戳之间的转换
http://blog.csdn.net/google19890102/article/details/51355282
时间戳转换为时间
![](https://img.haomeiwen.com/i6861691/0d5f761c765a4560.png)
2.时间序列(别人的笔记)
http://www.cnblogs.com/niuxiaoye1993lovecode/p/5894708.html
3.数据框的切片(loc用法)
![](https://img.haomeiwen.com/i6861691/87878307402a33f2.png)
4.pd.merge用法
http://www.jianshu.com/writer#/notebooks/15051374/notes/16168638
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