https://github.com/python/cpython/commit/e67334ab071bbb2e57501312a661ee937610abdd
commit: e67334ab071bbb2e57501312a661ee937610abdd
branch: main
author: Jelle Zijlstra <[email protected]>
committer: JelleZijlstra <[email protected]>
date: 2026-10-22T07:40:51-07:00
summary:
gh-159739: Do not intern complex subclasses in code constants (#159980)
files:
A
Misc/NEWS.d/next/Core_and_Builtins/2026-10-20-00-00-00.gh-issue-159739.d76e6d.rst
M Lib/test/test_code.py
M Objects/codeobject.c
diff --git a/Lib/test/test_code.py b/Lib/test/test_code.py
index 631e5fd2499b13..f54703cf37b2de 100644
--- a/Lib/test/test_code.py
+++ b/Lib/test/test_code.py
@@ -1251,10 +1251,15 @@ def __hash__(self):
class MyInt(int):
pass
+ class MyComplex(complex):
+ pass
+
code = compile("a = 1", "<string>", "exec")
- code = code.replace(co_consts=(1, Unhashable(), MyInt(1), MyInt(1)))
+ code = code.replace(co_consts=(1, Unhashable(), MyInt(1), MyInt(1),
+ MyComplex(1j)))
self.assertIsInstance(code.co_consts[1], Unhashable)
self.assertEqual(code.co_consts[2], code.co_consts[3])
+ self.assertFalse(sys._is_immortal(code.co_consts[4]))
class CodeWeakRefTest(unittest.TestCase):
diff --git
a/Misc/NEWS.d/next/Core_and_Builtins/2026-10-20-00-00-00.gh-issue-159739.d76e6d.rst
b/Misc/NEWS.d/next/Core_and_Builtins/2026-10-20-00-00-00.gh-issue-159739.d76e6d.rst
new file mode 100644
index 00000000000000..a027883426be19
--- /dev/null
+++
b/Misc/NEWS.d/next/Core_and_Builtins/2026-10-20-00-00-00.gh-issue-159739.d76e6d.rst
@@ -0,0 +1,2 @@
+Prevent free-threaded builds from interning and immortalizing complex
+subclasses in code object constants.
diff --git a/Objects/codeobject.c b/Objects/codeobject.c
index 724243d2b8cfae..eb390ab24ec13e 100644
--- a/Objects/codeobject.c
+++ b/Objects/codeobject.c
@@ -174,7 +174,7 @@ should_immortalize_constant(PyObject *v)
_Py_IsImmortal(slice->step));
}
return (PyLong_CheckExact(v) || PyFloat_CheckExact(v) ||
- PyComplex_Check(v) || PyBytes_CheckExact(v));
+ PyComplex_CheckExact(v) || PyBytes_CheckExact(v));
}
#endif
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