>>> mapped = {('Nikhil', 1, 50), ('Astha', 2, 70), ('Manjeet', 4, 40), ('Shambhavi', 3, 60)}
>>> namz, roll_noz, marksz = zip(*mapped)
>>> namz
('Manjeet', 'Astha', 'Shambhavi', 'Nikhil')