gistfile1.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""モジュラス10ウエイト3とISBNのチェックデジット計算。Python版。
"""
def m10w31(code):
    """モジュラス10ウエイト3チェックデジットの計算
    """
    s = list(str(code))
    s.reverse()
    sum = 0

    w = 3
    for i in s:
        sum = sum + (int(i) * w)
        if w == 3: w = 1
        else: w = 3

    d = sum % 10
    if d<>0: d = 10 - d
    return str(d)

def isbn10to13(isbn10):
    """10桁ISBNを13桁ISBNに変換
    """
    s = '978'+isbn10[:9]
    return s+m10w31(s)

def ssccBarCode(isbn13):
    """ SSCC bar code
     See, http://www.bisg.org/docs/shipping_label_guidelines_09-2005.pdf
    """
    PRFX1='01'
    PRFX2='1'
    code = isbn13[:12]
    return "(%s)%s %s-%s" % (PRFX1, PRFX2, code, m10w31(PRFX2+code))

if __name__=='__main__':
    data = ('4770025364','4770023230','4770015419','4881359290','4883731626','4873112109')
    for isbn10 in data:
         isbn13 = isbn10to13(isbn10)
         print " %s -> %s -> %s" % (isbn10,isbn13,ssccBarCode(isbn13))