call site 6 for _thread.WorkerPool.__init__
thread/testing/test_pool.py - line 81
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   def test_pool_clean_shutdown():
       capture = py.io.StdCaptureFD() 
->     pool = WorkerPool()
       def f():
           pass
       pool.dispatch(f)
       pool.dispatch(f)
       pool.shutdown()
       pool.join(timeout=1.0)
       assert not pool._alive
       assert not pool._ready
       out, err = capture.reset()
       print out
       print >>sys.stderr, err
       assert err == ''