Converts an IPv6 address to octal format for tinydns

ipv6octal.py

# This function is a translation of the PHP function described at
# http://thisisnotajoke.com/2011/07/12/aaaa-for-tinydns-php-function/
def ipv6octal(ipv6):
    while len(ipv6.split(':')) < 8:
        ipv6 = ipv6.replace('::', ':::')
    octets = []
    for part in ipv6.split(':'):
        if not part:
            octets.extend([0, 0])
        else:
            # Pad hex part to 4 digits.
            part = '%04x' % int(part, 16)
            octets.append(int(part[:2], 16))
            octets.append(int(part[2:], 16))
    return '\\' + '\\'.join(['%03o' % x for x in octets])