【参考链接】
http://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.append.html【1】
http://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.concat.html【2】
http://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.merge.html【3】
https://www.datacamp.com/courses/merging-dataframes-with-pandas【Datacamp】
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