问题
I've got ISBN numbers (10-digits and 13 digits) without the dashes. Now I'm looking for a way to add those dashes automatically.
I found some useful information here: http://www.isbn.org/standards/home/isbn/international/hyphenation-instructions.asp
But I'm not sure if it's doable at all, because the publisher identifier has a random length, and without knowing it, it's maybe not possible to determine the correct positions for the dashes.
Does anybody know if it's possible somehow?
Thanks a lot!
回答1:
You can deduce the length of the publisher identifier if you have the full range tables.
Example 1. ISBN 0141439564 (Penguin: Great Expectations)
- The group identifier is 0 (English language).
- The publisher ranges for this group are 00–19, 200–699, 7000–8499, 85000–89999, 900000-949999, and 9500000–9999999
- The next two digits are 14, which is in the range 00–19, so the publisher has 2 digits.
- So the hyphenated form is 0-14-143956-4
Example 2. ISBN 2253004227 (Poche: Gérminal)
- The group identifier is 2 (French language)
- The publisher ranges for this group are 00–19, 200–349, 35000–39999, 400–699, 7000–8399, 84000–89999, 900000–949999, 9500000–9999999
- The next three digits are 253, which is in the range 200–349, so the publisher has 3 digits
- So the hyphenated form is 2-253-00422-7
You can check your algorithm at the Library of Congress's ISBN hyphenation tool.
回答2:
For Python, you can use the library python-stdnum, isbnid or isbn_hyphenate. They can hyphenate ISBNs, and use the range table mentioned in the other answer.
回答3:
I wrote the following JavaScript function to hyphenate ISBNs (I know there is also isbnjs, but this is more compact and easier to include in other projects I think).
https://gist.github.com/aurimasv/6693537
回答4:
Take a look at https://pypi.python.org/pypi/isbntools, it will allow you to 'hyphenate' ISBNs and much more, like extracting, cleanning, transforming, and get metadata.
This is a library (that you can use in your program) but it installs several 'scripts' that you can use from the command line.
来源：https://stackoverflow.com/questions/4154708/how-to-automatically-apply-isbn-hyphenation