python concatenate if null

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Enrico
22 Sep 2017
1# Option 1
2df['concat'] = np.where(df['var_1'] == '', df['var_2'], df['var_1'] + '_u')
3
4# Option 2
5def concat_fields(field1, field2):
6        if field1.empty:
7            return field2
8        else:
9            return field1 + '_u'
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