Number validation issue

Discussion in 'Python' started by Morten Engvoldsen, Feb 22, 2013.

  1. Hi ,
    I have wrote the below code to validate a number using modulus 10 and 11:

    def is_valid_number(checknum, mod):
    if mod == 10:
    if not len(checknum) >= 2 and len(checknum) <=25:
    return False
    number = tuple(int(i) for i in reversed(str(checknum)) )
    return (sum(int(num) * 2 for num in number[1::2]) % 10) == 0
    elif mod == 11:
    if not len(checknum)!= 11:
    return False
    weights = [5, 4, 3, 2, 7, 6, 5, 4, 3, 2, 1]
    return (sum(w * int(x) for w, x in zip(weights, checknum)) % 11) ==
    0

    is_valid_number("12345678217", 10)

    The above code is able to validate 25 length number for modulus 10 , but
    for modulus 11 i have done the validation only for 11 digit, Since for
    modulus 11 the weight should be in
    ..............4,3,2,7,6, 5, 4, 3, 2, 7, 6, 5, 4, 3, 2, 1 in this format.

    Could you please let me know how can i validate the 25 length number for
    modulus 11 with weight ...............4,3,2,7,6, 5, 4, 3, 2, 7, 6, 5, 4, 3,
    2, 1 in this format.

    Regards,
    Morten
    Morten Engvoldsen, Feb 22, 2013
    #1
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