pd.concat([df1, df2], axis=1)df.sort_index(inplace=True)
https://stackoverflow.com/questions/40468069/merge-two-dataframes-by-index
https://stackoverflow.com/questions/22211737/python-pandas-how-to-sort-dataframe-by-index
Python, pandas: how to sort dataframe by index// Merge two dataframes by index
原文：https://www.cnblogs.com/focus-z/p/10000407.html