>>> from emails import address2

>>> address2('joan', 'vendrell')
'joan.vendrell@student.upc.edu'
>>> address2('Joan', 'Vives_de_la_Cortada')
'Joan.Vives_de_la_Cor@student.upc.edu'
>>> address2('Francesc_Xavier', 'Vives_de_la_Cortada')
'Francesc_X.Vives_de_la_Cor@student.upc.edu'