call site 2 for io.StdCapture.reset
io/test/test_stdcapture.py - line 86
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   def test_stdin_restored(self):
       old = sys.stdin 
       cap = self.getcapture(in_=True)
       newstdin = sys.stdin 
->     out, err = cap.reset()
       assert newstdin != sys.stdin
       assert sys.stdin is old