UPD: first little 2to3 migration steps.

dav_registration/views.py

@@ -183,6 +183,6 @@ class RegistrationSuccessView(generic.DetailView):
         try:
             pk = self.request.session['registration_id']
             obj = self.model.objects.get(pk=pk)
-        except KeyError, self.model.DoesNotExist:
+        except (KeyError, self.model.DoesNotExist):
             obj = None
         return obj