Python: Crear una matriz y obtener los datos de una columna.

Rubens-MacBook-Pro:python eljayan$ python

Python 2.7.7 (v2.7.7:f89216059edf, May 31 2014, 12:53:48) 

[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin

Type "help", "copyright", "credits" or "license" for more information.

>>> ruben = "ruben dario torres"

>>> ivan = "ivan alejandro torres" 

>>> alex = "fanny alexandra torres"

>>> ruben = ruben.split()

>>> ivan = ivan.split()

>>> alex = alex.split()

>>> print (ruben, ivan, alex)

(['ruben', 'dario', 'torres'], ['ivan', 'alejandro', 'torres'], ['fanny', 'alexandra', 'torres'])

>>> matriz = [ruben,ivan,alex]

>>> matriz

[['ruben', 'dario', 'torres'], ['ivan', 'alejandro', 'torres'], ['fanny', 'alexandra', 'torres']]

>>> matriz[0]

['ruben', 'dario', 'torres']

>>> matriz[1]

['ivan', 'alejandro', 'torres']

>>> matriz[2]

['fanny', 'alexandra', 'torres']

>>> #ahora quiero solo un listado de los segundos nombres

>>> #para eso uso un for iterator in iterable object:

>>> segundonombre = [element[1] for element in matriz]

>>> segundonombre

['dario', 'alejandro', 'alexandra']

>>>quit()