Issue 4382 - Use new syntax to catch exceptions in sitescripts

sitescripts/extensions/utils.py

 # This file is part of the Adblock Plus web scripts,
 # Copyright (C) 2006-2016 Eyeo GmbH
 #
 # Adblock Plus is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 3 as
 # published by the Free Software Foundation.
 #
 # Adblock Plus is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
@@ skipping 228 matching lines @@
     return urllib.quote(value.encode('utf-8'), '')
 
 
 def _urlopen(url, attempts=3):
     """
     Tries to open a particular URL, retries on failure.
     """
     for i in range(attempts):
         try:
             return urllib.urlopen(url)
-        except IOError, e:
+        except IOError as e:
             error = e
             time.sleep(5)
     raise error
 
 
 def _getMozillaDownloadLink(galleryID):
     """
     gets download link for a Gecko add-on from the Mozilla Addons site
     """
     url = 'https://services.addons.mozilla.org/en-US/firefox/api/1/addon/%s' % _urlencode(galleryID)
@@ skipping 111 matching lines @@
     if not extensions:
         return
 
     updates = {}
     for extension in extensions:
         updates[extension['basename']] = {
             'url': extension['updateURL'],
             'version': extension['version']
         }
     writeLibabpUpdateManifest(path, updates)