https://github.com/python/cpython/commit/df66175cb819882828bb2583fb58e56ab23dc01d
commit: df66175cb819882828bb2583fb58e56ab23dc01d
branch: 3.15
author: Miss Islington (bot) <[email protected]>
committer: JelleZijlstra <[email protected]>
date: 2026-07-27T00:03:23Z
summary:

[3.15] gh-151955: Allow more ParamSpec and TypeVarTuple bounds (GH-151956) 
(#152101)

gh-151955: Allow more ParamSpec and TypeVarTuple bounds (GH-151956)
(cherry picked from commit 0fb82b46df7bc95c2ba816afba56ff6a6c51caaf)

Co-authored-by: Jelle Zijlstra <[email protected]>

files:
A Misc/NEWS.d/next/Library/2026-06-22-18-01-00.gh-issue-151955.6u5iwm.rst
M Lib/test/test_typing.py
M Objects/typevarobject.c

diff --git a/Lib/test/test_typing.py b/Lib/test/test_typing.py
index 343159bf5dafa38..106ffdede6fd4ef 100644
--- a/Lib/test/test_typing.py
+++ b/Lib/test/test_typing.py
@@ -1318,6 +1318,11 @@ def test_infer_variance(self):
     def test_bound(self):
         Ts_bound = TypeVarTuple('Ts_bound', bound=int)
         self.assertIs(Ts_bound.__bound__, int)
+        Ts_tuple_bound = TypeVarTuple('Ts_tuple_bound', bound=(int, str))
+        self.assertEqual(Ts_tuple_bound.__bound__, (int, str))
+        obj = object()
+        Ts_object = TypeVarTuple('Ts_object', bound=obj)
+        self.assertIs(Ts_object.__bound__, obj)
         Ts_no_bound = TypeVarTuple('Ts_no_bound')
         self.assertIsNone(Ts_no_bound.__bound__)
 
@@ -10565,6 +10570,17 @@ def test_paramspec_in_nested_generics(self):
         self.assertEqual(G2[[int, str], float], list[C])
         self.assertEqual(G3[[int, str], float], list[C] | int)
 
+    def test_paramspec_bound(self):
+        P = ParamSpec('P', bound=[int, str])
+        self.assertEqual(P.__bound__, [int, str])
+        P2 = ParamSpec('P2', bound=(int, str))
+        self.assertEqual(P2.__bound__, (int, str))
+        obj = object()
+        P3 = ParamSpec('P3', bound=obj)
+        self.assertIs(P3.__bound__, obj)
+        P4 = ParamSpec('P4')
+        self.assertIs(P4.__bound__, None)
+
     def test_paramspec_gets_copied(self):
         # bpo-46581
         P = ParamSpec('P')
diff --git 
a/Misc/NEWS.d/next/Library/2026-06-22-18-01-00.gh-issue-151955.6u5iwm.rst 
b/Misc/NEWS.d/next/Library/2026-06-22-18-01-00.gh-issue-151955.6u5iwm.rst
new file mode 100644
index 000000000000000..4cb5f04025327c4
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-06-22-18-01-00.gh-issue-151955.6u5iwm.rst
@@ -0,0 +1,2 @@
+Allow more types to be used in the ``bound`` argument to
+:class:`typing.ParamSpec` and :class:`typing.TypeVarTuple`.
diff --git a/Objects/typevarobject.c b/Objects/typevarobject.c
index 78750a955d2a492..b2c3c79c93ff195 100644
--- a/Objects/typevarobject.c
+++ b/Objects/typevarobject.c
@@ -1340,20 +1340,12 @@ paramspec_new_impl(PyTypeObject *type, PyObject *name, 
PyObject *bound,
         PyErr_SetString(PyExc_ValueError, "Variance cannot be specified with 
infer_variance.");
         return NULL;
     }
-    if (bound != NULL) {
-        bound = type_check(bound, "Bound must be a type.");
-        if (bound == NULL) {
-            return NULL;
-        }
-    }
     PyObject *module = caller();
     if (module == NULL) {
-        Py_XDECREF(bound);
         return NULL;
     }
     PyObject *ps = (PyObject *)paramspec_alloc(
         name, bound, default_value, covariant, contravariant, infer_variance, 
module);
-    Py_XDECREF(bound);
     Py_DECREF(module);
     return ps;
 }
@@ -1634,23 +1626,12 @@ typevartuple_impl(PyTypeObject *type, PyObject *name, 
PyObject *bound,
         PyErr_SetString(PyExc_ValueError, "Variance cannot be specified with 
infer_variance.");
         return NULL;
     }
-    if (Py_IsNone(bound)) {
-        bound = NULL;
-    }
-    if (bound != NULL) {
-        bound = type_check(bound, "Bound must be a type.");
-        if (bound == NULL) {
-            return NULL;
-        }
-    }
     PyObject *module = caller();
     if (module == NULL) {
-        Py_XDECREF(bound);
         return NULL;
     }
     PyObject *result = (PyObject *)typevartuple_alloc(
         name, bound, default_value, covariant, contravariant, infer_variance, 
module);
-    Py_XDECREF(bound);
     Py_DECREF(module);
     return result;
 }

_______________________________________________
Python-checkins mailing list -- [email protected]
To unsubscribe send an email to [email protected]
https://mail.python.org/mailman3//lists/python-checkins.python.org
Member address: [email protected]

Reply via email to