Jan 26, 2026 · Jan 23, 2026 · Jan 24, 2026 · Jan 23, 2026 · Jan 24, 2026
diff --git a/Lib/test/test_ast/test_ast.py b/Lib/test/test_ast/test_ast.py
        self.assertIs(node.ctx, context)
        self.assertRaises(AttributeError, getattr, node, 'unknown')

    def test_replace_non_str_kwarg(self):
        node = ast.Name(id="x")
        errmsg = "got an unexpected keyword argument <object object"
        with self.assertRaisesRegex(TypeError, errmsg):
            node.__replace__(**{object(): "y"})


 class ASTHelpers_Test(unittest.TestCase):
    maxDiff = None

        self.assertIs(obj.a, None)
        self.assertEqual(obj.b, [])

    def test_non_str_kwarg(self):
        warn_msg = "got an unexpected keyword argument <object object"
        with (
            self.assertRaises(TypeError),
            self.assertWarnsRegex(DeprecationWarning, warn_msg),
        ):
            ast.Name(**{object(): 'y'})

        class FakeStr:
            def __init__(self, value):
                self.value = value

            def __hash__(self):
                return hash(self.value)

            def __eq__(self, other):
                return isinstance(other, str) and self.value == other

        with self.assertRaisesRegex(TypeError, "got multiple values for argument"):
            ast.Name("x", **{FakeStr('id'): 'y'})


 @support.cpython_only
 class ModuleStateTests(unittest.TestCase):
diff --git a/Misc/NEWS.d/next/Library/2026-01-23-06-43-21.gh-issue-144169.LFy9yi.rst b/Misc/NEWS.d/next/Library/2026-01-23-06-43-21.gh-issue-144169.LFy9yi.rst
 Fix three crashes when non-string keyword arguments are supplied to objects
 in the :mod:`ast` module.
diff --git a/Parser/asdl_c.py b/Parser/asdl_c.py
                }
                if (p == 0) {
                    PyErr_Format(PyExc_TypeError,
                        "%.400s got multiple values for argument'%U'",
                        "%.400s got multiple values for argument%R",
                        Py_TYPE(self)->tp_name, key);
                    res = -1;
                    goto cleanup;
                else if (contains == 0) {
                    if (PyErr_WarnFormat(
                        PyExc_DeprecationWarning, 1,
                        "%.400s.__init__ got an unexpected keyword argument'%U'. "
                        "%.400s.__init__ got an unexpected keyword argument%R. "
                        "Support for arbitrary keyword arguments is deprecated "
                        "and will be removed in Python 3.15.",
                        Py_TYPE(self)->tp_name, key
            if (rc == 0) {
                PyErr_Format(PyExc_TypeError,
                             "%.400s.__replace__ got an unexpected keyword "
                             "argument'%U'.", Py_TYPE(self)->tp_name, key);
                             "argument%R.", Py_TYPE(self)->tp_name, key);
                Py_DECREF(expecting);
                return -1;
            }
diff --git a/Python/Python-ast.c b/Python/Python-ast.c
Original file line number	Diff line number	Diff line change
Expand Up		@@ -1443,6 +1443,13 @@ def test_replace_reject_unknown_instance_fields(self):
		self.assertIs(node.ctx, context)
		self.assertRaises(AttributeError, getattr, node, 'unknown')

		def test_replace_non_str_kwarg(self):
		node = ast.Name(id="x")
		errmsg = "got an unexpected keyword argument <object object"
		with self.assertRaisesRegex(TypeError, errmsg):
		node.__replace__(**{object(): "y"})


		class ASTHelpers_Test(unittest.TestCase):
		maxDiff = None

Expand DownExpand Up		@@ -3304,6 +3311,27 @@ class _AllFieldTypes(ast.AST):
		self.assertIs(obj.a, None)
		self.assertEqual(obj.b, [])

		def test_non_str_kwarg(self):
		warn_msg = "got an unexpected keyword argument <object object"
		with (
		self.assertRaises(TypeError),
		self.assertWarnsRegex(DeprecationWarning, warn_msg),
		):
		ast.Name(**{object(): 'y'})

		class FakeStr:
		def __init__(self, value):
		self.value = value

		def __hash__(self):
		return hash(self.value)

		def __eq__(self, other):
		return isinstance(other, str) and self.value == other

		with self.assertRaisesRegex(TypeError, "got multiple values for argument"):
		ast.Name("x", **{FakeStr('id'): 'y'})


		@support.cpython_only
		class ModuleStateTests(unittest.TestCase):
Expand Down
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		Fix three crashes when non-string keyword arguments are supplied to objects
		in the :mod:`ast` module.