So using sys.excepthook to catch errors only works once.

The error bubbles through the event processing loop, breaking it and
hanging the application.

Instead, there is now a .exception(e) method on XMLStream which may
be overridden or reassigned that will receive all unhandled exceptions
(read: not XMPPError) from event and stream handlers.

tests/test_stream_xep_0128.py

@@ -13,7 +13,6 @@ class TestStreamExtendedDisco(SleekTest):
     """
 
     def tearDown(self):
-        sys.excepthook = sys.__excepthook__
         self.stream_close()
 
     def testUsingExtendedInfo(self):