From 51244ba16a7312945a60dff18ed155a581295fbf Mon Sep 17 00:00:00 2001
From: =?utf8?q?B=C3=A9n=C3=A9dikt=20Tran?=
 <10796600+picnixz@users.noreply.github.com>
Date: Wed, 3 Sep 2025 09:55:53 +0200
Subject: [PATCH] gh-116946: add `Py_TPFLAGS_IMMUTABLETYPE` to `_random.Random`
 (#138341)

---
 .../2025-09-02-10-23-09.gh-issue-116946.U6RpwK.rst  |  2 ++
 Modules/_randommodule.c                             | 13 ++++++++-----
 2 files changed, 10 insertions(+), 5 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Library/2025-09-02-10-23-09.gh-issue-116946.U6RpwK.rst

diff --git a/Misc/NEWS.d/next/Library/2025-09-02-10-23-09.gh-issue-116946.U6RpwK.rst b/Misc/NEWS.d/next/Library/2025-09-02-10-23-09.gh-issue-116946.U6RpwK.rst
new file mode 100644
index 000000000000..015cf24c8869
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-09-02-10-23-09.gh-issue-116946.U6RpwK.rst
@@ -0,0 +1,2 @@
+The :class:`!_random.Random` C type is now immutable. Patch by Bénédikt
+Tran.
diff --git a/Modules/_randommodule.c b/Modules/_randommodule.c
index 2f4f388ce116..aa2fd28c232f 100644
--- a/Modules/_randommodule.c
+++ b/Modules/_randommodule.c
@@ -595,11 +595,14 @@ static PyType_Slot Random_Type_slots[] = {
 };
 
 static PyType_Spec Random_Type_spec = {
-    "_random.Random",
-    sizeof(RandomObject),
-    0,
-    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
-    Random_Type_slots
+    .name = "_random.Random",
+    .basicsize = sizeof(RandomObject),
+    .flags = (
+        Py_TPFLAGS_DEFAULT
+        | Py_TPFLAGS_BASETYPE
+        | Py_TPFLAGS_IMMUTABLETYPE
+    ),
+    .slots = Random_Type_slots
 };
 
 PyDoc_STRVAR(module_doc,
-- 
2.47.3