test_ast.py 文件源码

def test_AST_objects(self):
        if not support.check_impl_detail():
            # PyPy also provides a __dict__ to the ast.AST base class.
            return

        x = ast.AST()
        self.assertEqual(x._fields, ())

        with self.assertRaises(AttributeError):
            x.vararg

        with self.assertRaises(AttributeError):
            x.foobar = 21

        with self.assertRaises(AttributeError):
            ast.AST(lineno=2)

        with self.assertRaises(TypeError):
            # "_ast.AST constructor takes 0 positional arguments"
            ast.AST(2)