>>> names = ["vincent", "etienne", "joel"]
>>> new_names = map(lambda s: [s, s.upper()], names)
>>> new_names
[['vincent', 'VINCENT'], ['etienne', 'ETIENNE'], ['joel', 'JOEL']]
>>> new_names[0]
['vincent', 'VINCENT']
>>> map(lambda x: x[0], new_names)
['vincent', 'etienne', 'joel']
>>>