merge two columns name in one header pandas

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Sara
11 Jan 2019
1df['A'] = df[a_cols].apply(' '.join, axis=1)
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Silvia
02 Mar 2016
1#suppose you have two dataframes df1 and df2, and 
2#you need to merge them along the column id
3df_merge_col = pd.merge(df1, df2, on='id')
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