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[3.14] gh-159739: Do not intern complex subclasses in code constants (GH-159980) by miss-islington · Pull Request #160250 · python/cpython · GitHub

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[3.14] gh-159739: Do not intern complex subclasses in code constants (GH-159980) #160250

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Merged
JelleZijlstra merged 1 commit into from
Oct 22, 2026
Conversation 0 Commits 1 Checks 48 Files changed
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[3.14] gh-159739: Do not intern complex subclasses in code constants (GH-159980) #160250

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7 changes: 6 additions & 1 deletion Lib/test/test_code.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1245,10 +1245,15 @@ 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):
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2026-10-20-00-00-00.gh-issue-159739.d76e6d.rst
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@@ -0,0 +1,2 @@
Prevent free-threaded builds from interning and immortalizing complex
subclasses in code object constants.
2 changes: 1 addition & 1 deletion Objects/codeobject.c
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Expand Up @@ -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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