1 # -*- coding: utf-8 -*-

     2 

     3 def get_validation_digit(number):

     4     """ Calculates the validation digit for the given number. """

     5     sum = 0

     6     dvs = [4, 3, 6, 7, 8, 9, 2]

     7     number = str(number)

     8 

     9     for i in range(0, len(number)):

    10         sum = (int(number[-1 - i]) * dvs[i] + sum) % 10

    11 

    12     return (10-sum) % 10