Python, pandas: how to sort dataframe by index// Merge two dataframes by index
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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
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