test_sys.py 文件源码

def test_original_excepthook(self):
        err = io.StringIO()
        sys.stderr = err

        eh = sys.__excepthook__

        self.assertRaises(TypeError, eh)
        try:
            raise ValueError(42)
        except ValueError as exc:
            eh(*sys.exc_info())

        self.assertTrue(err.getvalue().endswith("ValueError: 42\n"))