Re: Number validation issue

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

  1. Hi,
    Thanks for your reply.

    Here in your code i think you didn't multiply the given number with the
    weight i have mentioned. The each digit of the given number should
    multiply with weight ...............4,3,2,7,6, 5, 4, 3, 2, 7, 6, 5, 4, 3,2,
    1 in this format. That is in detail:

    To verify the number use the following weights from right to left:
    1, 2, 3, 4, 5, 6, 7, 2, 3, 4, 5, 6, 7, 2, 3, 4, 5, 6, 7...
    Multiply each digit by its corresponding weight. Add the results together.
    For the number to be correct the
    total must be divisible by 11.
    Field with control digit 1 2 3 4 5 6 7 8 5
    Weight 3 2 7 6 5 4 3 2 1
    Produce +3 +4 +21 +24 +25 +24 +21 +16 +5 =143
    The sum must be divisible by 11 (143 divided by 11 leaves a remainder of 0)..

    So my code has validated only the length of 11 digit. So i am looking for
    'n' length of number should be validated with weight
    ................4,3,2,7,6, 5, 4, 3, 2, 7, 6, 5, 4, 3,2, 1 from left to
    right..

    Thanks again ...


    On Fri, Feb 22, 2013 at 4:33 PM, Alec Taylor <> wrote:

    > Whoops, my mistake:
    >
    > In [5]: [not len(x) >= 2 and len(x)<=25 for x in [str(y) for y in
    > xrange(30)]]
    > Out [5]: [True]*10, [False]*20
    >
    > But still, I'm guessing that's not the result you were looking for…
    >
    > On Sat, Feb 23, 2013 at 2:30 AM, Alec Taylor <>
    > wrote:
    > > Out[1]: '0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
    > > 24 25 26 27 28 29'
    > >
    > > In [2]: [not len(x) >= 2 and len(x)<=25 for x in _]
    > > Out[2]: [True]*79 # shorthand to prevent spam
    > >
    > >
    > > I trust you can see the error now!
    > >
    > > On Sat, Feb 23, 2013 at 2:09 AM, Morten Engvoldsen <>

    > wrote:
    > >> 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
    > >>
    > >>
    > >>
    > >> --
    > >> http://mail.python.org/mailman/listinfo/python-list
    > >>

    >
    Morten Engvoldsen, Feb 22, 2013
    #1
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