Generate rainbow table for all HKID: To prove hashing HKID is not a security measure

hkid.py

from __future__ import print_function
import itertools
import hashlib

# generate a rainbow table for HKID
# 2017-02-11

def checkdigit(a, i, j, k, l, m, n):
    numeric = [ord(a) - 65 + 1, int(i), int(j), int(k), int(l), int(m), int(n)]
    weight = range(8,1,-1)
    product = sum(n*w for n,w in zip(numeric, weight))
    rem = 11 - (product % 11)
    return 'A' if rem == 10 else str(rem)

alpha = [chr(o) for o in range(65, 91)]
digit = [str(x) for x in range(10)]
with open('hkid-rainbow.txt', 'wa') as f:
    for a, i, j, k, l, m, n in itertools.product(alpha, digit, digit, digit, digit, digit, digit):
        x = checkdigit(a, i, j, k, l, m, n)
        hkid = ''.join([a, i, j, k, l, m, n, '(', x, ')'])
        print(hashlib.sha512(hkid).hexdigest(), file=f)