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Merge two columns name in one header pandas

Pandas merge two columns from different dataframes

#suppose you have two dataframes df1 and df2, and 
#you need to merge them along the column id
df_merge_col = pd.merge(df1, df2, on='id')

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Merge two columns name in one header pandas

df['A'] = df[a_cols].apply(' '.join, axis=1)

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Source: stackoverflow.com

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