code: def company_vat_checksum(digits):
      
      weights_for_check_digit = [6, 5, 7, 2, 3, 4, 5, 6, 7]
      check_digit = 0
  
      for i in range(0, 9):
          check_digit += weights_for_check_digit[i] * digits[i]
  
      check_digit %= 11
  
      return check_digit
docs: Calculates and returns a control digit for given list of digits basing on NIP standard.