Index: Lib/_dummy_thread.py
===================================================================
--- Lib/_dummy_thread.py	(revision 66320)
+++ Lib/_dummy_thread.py	(working copy)
@@ -16,7 +16,15 @@
 __all__ = ['error', 'start_new_thread', 'exit', 'get_ident', 'allocate_lock',
            'interrupt_main', 'LockType']
 
-import traceback as _traceback
+def _print_exc(limit=None, file=None, chain=True): # copied from "traceback"
+    """Shorthand for 'print_exception(*sys.exc_info(), limit, file)'."""
+    if file is None:
+        file = sys.stderr
+    try:
+        etype, value, tb = sys.exc_info()
+        print_exception(etype, value, tb, limit, file, chain)
+    finally:
+        etype = value = tb = None
 
 class error(Exception):
     """Dummy implementation of _thread.error."""
@@ -48,7 +56,7 @@
     except SystemExit:
         pass
     except:
-        _traceback.print_exc()
+        _print_exc()
     _main = True
     global _interrupt
     if _interrupt: