python urrlib error

Test the urllib.request.thishost utility function returns a tuple ... ERROR
test_quoted_open (test.test_urllib.URLopener_Tests) ... /home/aquiles/Downloads/Python-3.3.0/Lib/unittest/case.py:385: DeprecationWarning: DummyURLopener style of invoking requests is deprecated. Use newer urlopen functions/methods
  function()
ok
test_default_values (test.test_urllib.RequestTests) ... ok
test_with_method_arg (test.test_urllib.RequestTests) ... ok

======================================================================
ERROR: test_thishost (test.test_urllib.Utility_Tests)
Test the urllib.request.thishost utility function returns a tuple
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Traceback (most recent call last):
  File "/home/aquiles/Downloads/Python-3.3.0/Lib/test/test_urllib.py", line 1155, in test_thishost
    self.assertIsInstance(urllib.request.thishost(), tuple)
  File "/home/aquiles/Downloads/Python-3.3.0/Lib/urllib/request.py", line 2236, in thishost
    _thishost = tuple(socket.gethostbyname_ex(socket.gethostname())[2])
socket.gaierror: [Errno -2] Name or service not known

----------------------------------------------------------------------
Ran 66 tests in 0.100s

FAILED (errors=1, skipped=1)
test test_urllib failed
make: *** [test] Error 1