I tried to remove the first two prints (I reverted the file and the only
difference with the original was the print after evt.set() (that here
didn't print anything)) and I got something better:

$ ./python Lib/test/regrtest.py -v test_docxmlrpc
test_docxmlrpc
test_valid_get_response (test.test_docxmlrpc.DocXMLRPCHTTPGETServer) ... ok

----------------------------------------------------------------------
Ran 1 test in 0.063s

OK
1 test OK.
Exception in thread Thread-1 (most likely raised during interpreter
shutdown):
Traceback (most recent call last):
  File "/home/wolf/python-trunk/Lib/threading.py", line 524, in
__bootstrap_inner
  File "/home/wolf/python-trunk/Lib/threading.py", line 477, in run
  File "/home/wolf/python-trunk/Lib/test/test_docxmlrpc.py", line 55, in
server
<type 'exceptions.AttributeError'>: 'NoneType' object has no attribute
'write'
Unhandled exception in thread started by
Error in sys.excepthook:

Original exception was: