gh-115231: Fill __module__ for built-in staticmethods (#115232)

skirpichev · sobolevn · vstinner · web-flow · commit 15c9f2491d23 · 2026-02-02T12:34:02.000+01:00
Co-authored-by: Nikita Sobolev &lt;mail@sobolevn.me&gt;
Co-authored-by: Victor Stinner &lt;vstinner@python.org&gt;
diff --git a/Lib/test/test_funcattrs.py b/Lib/test/test_funcattrs.py
@@ -459,6 +459,24 @@ class BuiltinFunctionPropertiesTest(unittest.TestCase):
     # XXX Not sure where this should really go since I can't find a
     # test module specifically for builtin_function_or_method.
 
+    def test_builtin__module__(self):
+        import math
+
+        # builtin function:
+        self.assertEqual(len.__module__, 'builtins')
+        self.assertEqual(math.sin.__module__, 'math')
+
+        # instance method:
+        self.assertRaises(AttributeError, getattr, int.to_bytes, '__module__')
+        self.assertEqual(int.to_bytes.__objclass__.__module__, 'builtins')
+
+        # builtin classmethod:
+        self.assertEqual(int.from_bytes.__module__, None)
+        self.assertEqual(int.from_bytes.__self__.__module__, 'builtins')
+
+        # builtin staticmethod:
+        self.assertEqual(bytes.maketrans.__module__, 'builtins')
+
     def test_builtin__qualname__(self):
         import time
 
diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2024-02-10-05-42-26.gh-issue-115231.6T7dzi.rst b/Misc/NEWS.d/next/Core_and_Builtins/2024-02-10-05-42-26.gh-issue-115231.6T7dzi.rst
@@ -0,0 +1,2 @@
+Setup ``__module__`` attribute for built-in static methods.  Patch by Sergey
+B Kirpichev.
diff --git a/Objects/typeobject.c b/Objects/typeobject.c
@@ -8361,7 +8361,15 @@ type_add_method(PyTypeObject *type, PyMethodDef *meth)
         descr = PyDescr_NewClassMethod(type, meth);
     }
     else if (meth->ml_flags & METH_STATIC) {
-        PyObject *cfunc = PyCFunction_NewEx(meth, (PyObject*)type, NULL);
+        PyObject *mod = type_module(type);
+        if (mod == NULL) {
+            if (!PyErr_ExceptionMatches(PyExc_AttributeError)) {
+                return -1;
+            }
+            PyErr_Clear();
+        }
+        PyObject *cfunc = PyCFunction_NewEx(meth, (PyObject*)type, mod);
+        Py_XDECREF(mod);
         if (cfunc == NULL) {
             return -1;
         }

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	+Setup ``__module__`` attribute for built-in static methods. Patch by Sergey
	`2`	`+B Kirpichev.`