str(etype)

IPython/zmq/parallel/streamsession.py

@@ -66,7 +66,7 b' def wrap_exception():'
     exc_content = {
         'status' : 'error',
         'traceback' : [ line.encode('utf8') for line in tb ],
-        'etype' : etype.encode('utf8'),
+        'etype' : str(etype).encode('utf8'),
         'evalue' : evalue.encode('utf8')
     }
     return exc_content