patch-extra_PythonSerializer

--- extra/PythonSerializer.orig.py      2013-03-29 11:43:37.533612394 +0100
+++ extra/PythonSerializer.py   2013-03-29 11:43:51.826607152 +0100
@@ -84,9 +84,9 @@
                        {str(NIENS["InformationElement"]): "Interpretation", str(NIENS["DataObject"]): "Manifestation"})
                assert root_type
                #TODO: displayname, how are translation handled? on trig level or on python level?
-               stream.write(
+               stream.write(str(
                        "Symbol('%s', parent=%r, uri='%s', display_name='%s', doc='%s', auto_resolve=False)\n" %(name,
-                               root_type, symbol, display_name, doc)
+                               root_type, symbol, display_name, doc))
                )