call site 2 for io.StdCapture.call
io/test/test_stdcapture.py - line 120
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   def test_callcapture(self): 
       def func(x, y): 
           print x
           print >>py.std.sys.stderr, y
           return 42
         
->     res, out, err = py.io.StdCaptureFD.call(func, 3, y=4) 
       assert res == 42 
       assert out.startswith("3") 
       assert err.startswith("4")