Slicing example??

import numpy as np
import itertools as it

def use_list(x, length):
    c = it.product(x, repeat=length)
    return np.array(list(c), dtype=np.complex64)

def use_slicing(x, length):
    data = np.empty((len(x)**length, length), dtype=np.complex64)
    for i in range(length):
        for j in range(len(x)):
            data[j::len(x), i] = x[j]
    return data

length = 4
x = [np.complex(1,0), np.complex(-1,0),
     np.complex(0,1), np.complex(0,-1)]

a = use_list(x, length)
b = use_slicing(x, length)
print a
print b

assert set(map(tuple, a))  == set(map(tuple, b)), 'Differing results!'