olxol = [ [ 1, 2, 3 ], [ 4, 5, 6 ], [ 7, 8, 9 ] ]
indiciesOfColumnsToShow = [ 0, 2 ]
npArray = numpy.array( olxol )[:, indiciesOfColumnsToShow]
olxol2s = npArray.tolist()
olxol2s
>>> [ [ 1, 3 ], [ 4, 6 ], [ 7, 9 ] ]