From 63b2b0a861bc5135227aae9f98823169fd419ddf Mon Sep 17 00:00:00 2001
From: Arthur de Jong <arthur@arthurdejong.org>
Date: Mon, 20 Jun 2011 20:56:39 +0000
Subject: implement a conversion function from ISSN to EAN

git-svn-id: http://arthurdejong.org/svn/python-stdnum/python-stdnum@72 9dea7c4f-944c-4273-ac1a-574ede026edc
---
 stdnum/issn.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'stdnum/issn.py')

diff --git a/stdnum/issn.py b/stdnum/issn.py
index 4f879c4..4b5412e 100644
--- a/stdnum/issn.py
+++ b/stdnum/issn.py
@@ -28,8 +28,12 @@ False
 '00321478'
 >>> format('00249319')
 '0024-9319'
+>>> to_ean('0264-3596')
+'9770264359008'
 """
 
+from stdnum import ean
+
 
 def compact(number):
     """Convert the ISSN to the minimal representation. This strips the number
@@ -58,3 +62,9 @@ def format(number):
     """Reformat the passed number to the standard format."""
     number = compact(number)
     return number[:4] + '-' + number[4:]
+
+def to_ean(number, issue_code='00'):
+    """Convert the number to EAN-13 format. The number is assumed to be a
+    valid ISSN."""
+    number = '977' + compact(number)[:-1] + issue_code
+    return number + ean.calc_check_digit(number)
-- 
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