test_fileinput.py 文件源码

def test_state_is_None(self):
        """Tests fileinput.lineno() when fileinput._state is None.
           Ensure that it raises RuntimeError with a meaningful error message
           and does not modify fileinput._state"""
        fileinput._state = None
        with self.assertRaises(RuntimeError) as cm:
            fileinput.lineno()
        self.assertEqual(("no active input()",), cm.exception.args)
        self.assertIsNone(fileinput._state)