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How do I join 2 dataframes on their indexes?

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  y_final= y_test2.merge(df, left_on='index', right_on='index')
  KeyError: 'index'
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    Can you post dataframe examples as text? Commented May 14, 2020 at 16:34
  • 1
    We need dataframe and expected output for our reference? Commented May 14, 2020 at 16:35
  • There are multiple meanings to "join" - inner, outer, merge, update.... expected output helps narrow that down. Commented May 14, 2020 at 16:37

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Try this one!

pd.merge(dataframe1, dataframe2, left_index=True, right_index=True)
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