Adding row/column headers to NumPy arrays

Question

I have a NumPy ndarray to which I would like to add row/column headers.

The data is actually 7x12x12, but I can represent it like this:

Answer 1

Think this does the trick generically

Input

mats = array([[[0, 1, 2, 3, 4, 5],
    [1, 0, 3, 4, 5, 6],
    [2, 3, 0, 5, 6, 7],
    [3, 4, 5, 0, 7, 8],
    [4, 5, 6, 7, 0, 9],
    [5, 6, 7, 8, 9, 0]],

   [[0, 1, 2, 3, 4, 5],
    [1, 0, 3, 4, 5, 6],
    [2, 3, 0, 5, 6, 7],
    [3, 4, 5, 0, 7, 8],
    [4, 5, 6, 7, 0, 9],
    [5, 6, 7, 8, 9, 0]]])

Code

# Recursively makes pyramiding column and row headers
def make_head(n):
    pre = ''
    if n/26:
        pre = make_head(n/26-1)

    alph = "abcdefghijklmnopqrstuvwxyz"
    pre+= alph[n%26]
    return pre

# Generator object to create header items for n-rows or n-cols
def gen_header(nitems):
    n = -1
    while n

Output (value stored in mats):

array([[['A', 'a', 'b', 'c', 'd', 'e', 'f'],
        ['a', '0', '1', '2', '3', '4', '5'],
        ['b', '1', '0', '3', '4', '5', '6'],
        ['c', '2', '3', '0', '5', '6', '7'],
        ['d', '3', '4', '5', '0', '7', '8'],
        ['e', '4', '5', '6', '7', '0', '9'],
        ['f', '5', '6', '7', '8', '9', '0']],

       [['A', 'a', 'b', 'c', 'd', 'e', 'f'],
        ['a', '0', '1', '2', '3', '4', '5'],
        ['b', '1', '0', '3', '4', '5', '6'],
        ['c', '2', '3', '0', '5', '6', '7'],
        ['d', '3', '4', '5', '0', '7', '8'],
        ['e', '4', '5', '6', '7', '0', '9'],
        ['f', '5', '6', '7', '8', '9', '0']]], 
      dtype='|S4')