>>> from candidates import votes_income

>>> dvotes = {'Joan Pere Jorbina Palau':570, 
... 'Niceto Brunildo Fornells':679, 'Mariona Puig Peix': 701, 
... 'Adriana de Tor Quemada': 451}
>>> dinc = {'Mariona Puig Peix':15456, 'Arnau Osorio Lucas':27654, 
... 'Arnau Brigat Pelfred': 18654, 'Niceto Brunildo Fornells':14567}
>>> votes_income(dvotes, dinc)
['Adriana de Tor Quemada', 'Joan Pere Jorbina Palau']

>>> votes_income(dvotes, {})
['Adriana de Tor Quemada', 'Joan Pere Jorbina Palau', 'Mariona Puig Peix', 'Niceto Brunildo Fornells']
>>> votes_income({}, dinc)
[]