conf.py: py2/py3 compatible exception handling

Python 3 requires "except Exception as ex"

Python earlier than 2.6 does not understand that syntax.

To be compatible with both, get the exception object from
sys.exc_info().

Related: rhbz#1328199

Author: ktdreyer

kobo/conf.py

@@ -26,6 +26,7 @@
 import fnmatch
 import itertools
 import keyword
+import sys
 import token
 import tokenize
 from cStringIO import StringIO
@@ -333,5 +334,6 @@ def _get_tuple(self):
     try:
         settings = PyConfigParser()
         settings.load_from_file(os.environ.get("PROJECT_CONFIG_FILE"))
-    except Exception, ex:
+    except Exception:
+        ex = sys.exc_info()[1]
         raise ImproperlyConfigured("Could not load config file: %s" % ex)