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pandas combine two data frames with same index and same columns

pd.merge(df1, df2, left_index=True, right_index=True, how='outer')
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marge 2 rows in same dataframe python

obj_df = df.select_dtypes(include=[np.object])
num_df = df.select_dtypes(exclude=[np.object])

obj_df.head(1).combine_first(obj_df.tail(1)).join(num_df.head(1).add(num_df.tail(1)))
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combine two dataframes of same length

df = pd.concat([T1.reset_index(drop=True),T2.reset_index(drop=True)], axis=1)
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