Kalkuler kontrollsifre på norske personnumre

personummer_kontrollsifre.py

# coding: utf-8


def kk(ssn9):
    """
        Calculates control decimals for norwegian national identity numbers
         see:  https://no.wikipedia.org/wiki/F%C3%B8dselsnummer#Oppbygning        
         
         D nummer: https://no.wikipedia.org/wiki/F%C3%B8dselsnummer#D-nummer
             
        k1 = 11 - ((3 × d1 + 7 × d2 + 6 × m1 + 1 × m2 + 8 × å1 + 9 × å2 + 4 × i1 + 5 × i2 + 2 × i3) mod 11),            # noqa
        k2 = 11 - ((5 × d1 + 4 × d2 + 3 × m1 + 2 × m2 + 7 × å1 + 6 × å2 + 5 × i1 + 4 × i2 + 3 × i3 + 2 × k1) mod 11).
    """
    dd = ssn9[:2]
    mm = ssn9[2:4]
    yy = ssn9[4:6]
    ii = ssn9[6:]

    k1 = 11 - (
        3 * int(dd[0]) +
        7 * int(dd[1]) +
        6 * int(mm[0]) +
        1 * int(mm[1]) +
        8 * int(yy[0]) +
        9 * int(yy[1]) +
        4 * int(ii[0]) +
        5 * int(ii[1]) +
        2 * int(ii[2])
    ) % 11

    k2 = 11 - (
        5 * int(dd[0]) +
        4 * int(dd[1]) +
        3 * int(mm[0]) +
        2 * int(mm[1]) +
        7 * int(yy[0]) +
        6 * int(yy[1]) +
        5 * int(ii[0]) +
        4 * int(ii[1]) +
        3 * int(ii[2]) +
        2 * int(k1)
    ) % 11

    k1 = 0 if k1 == 11 else k1
    k2 = 0 if k2 == 11 else k2

    if k1 == 1 and k2 == 0:
        raise ValueError(
            'Kontrollsiffrene kan ikke bli 10, ugyldig personnummer')

    return "{}{}".format(k1, k2)


if __name__ == '__main__':
    print(u"410180222", kk(u"410180222"))
    ssn9 = input("Enter the nine first siffer in personnummer")
    k = kk(ssn9)
    print("personnummer is: {}{}".format(ssn9, k))