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Apply lambda function to multiple columns pandas

Lambda with two columns pandas

tp['col'] = tp.apply(lambda row: row['source'] if row['target'] in ['b', 'n'] else 'x',
                     axis=1)

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Source: stackoverflow.com

Apply lambda function to multiple columns pandas

df['new_col'] = df.apply(lambda x: some_func(x['col1'], x['col2']))

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