Verification of bank number using modulus 11

[MRAB]

On 2013-02-19 20:50, Morten Engvoldsen wrote:
> Hi Team,
> I am trying to verify the account number using the following algorithm:
 >
> "The valid account number is 11 numeric digit without seperator. Eg.
> 86011117947 is a valid account number. All banks apply a modulus-based
> method for the validation of the account structure. The 10-digit account
> number is multiplied from left to right by the following weights: 5, 4,
> 3, 2, 7, 6, 5, 4, 3, 2. The resulting numbers are added up and divided
> by 11. The remainder is subtracted from 11 and becomes the check digit.
> If the remainder is 0, the check digit will be 0. If digits 5 and 6 of
> the account number are zeros, the check digit is calculated on the 7, 8,
> 9 and 10th digit of the account number. Account numbers for which the
> remainder is 1 (check digit 10) cannot be used."
 >
>   I am trying to validate the Norway account number using the algorithm
> mentioned in the following document:
> http://www.cnb.cz/miranda2/export/sites/www.cnb.cz/cs/platebni_styk/iban/download/TR201.pdf
>
> Here is my code:
>   def calc_checkdigit(isbn):
>          isbn = isbn.replace(".", "")
>          check_digit = int(isbn[-1])
>          isbn = isbn[:-1]
>          if len(isbn) != 10:
>                 return False
>          result = sum((10 - i) * (int(x) if x != 'X' else 10) for i, x in enumerate(isbn))
>          return (result % 11) == check_digit
>
> calc_checkdigit(""8601.11.17947"")
>
> In my program : it is calculating 10 digit with weights 10-1, but
> according to above algorithm the weights should be : 5, 4, 3, 2, 7, 6,
> 5, 4, 3, 2.
>
> Could you please let me know how can i calculate the 10 digit with
> weights 5, 4, 3, 2, 7, 6, 5, 4, 3, 2. I am using python 2.7.
>
> Thanks in advance team for help..
>
Put the weights into a list and use 'zip' instead of 'enumerate':

sum(w * (10 if d == 'X' else int(d)) for w, d in zip(weights, isbn))