https://github.com/python/cpython/commit/12fbc90e063b118f489241ae9f806a9d694a5682
commit: 12fbc90e063b118f489241ae9f806a9d694a5682
branch: main
author: Ilya Egorov <[email protected]>
committer: corona10 <[email protected]>
date: 2026-10-08T08:56:38+09:00
summary:
gh-158592: Reallocate the list's array when deleting by index (gh-158602)
files:
A
Misc/NEWS.d/next/Core_and_Builtins/2026-10-02-16-19-35.gh-issue-158592.V6W21J.rst
M Objects/listobject.c
diff --git
a/Misc/NEWS.d/next/Core_and_Builtins/2026-10-02-16-19-35.gh-issue-158592.V6W21J.rst
b/Misc/NEWS.d/next/Core_and_Builtins/2026-10-02-16-19-35.gh-issue-158592.V6W21J.rst
new file mode 100644
index 00000000000000..1112ca8e63d314
--- /dev/null
+++
b/Misc/NEWS.d/next/Core_and_Builtins/2026-10-02-16-19-35.gh-issue-158592.V6W21J.rst
@@ -0,0 +1 @@
+``del list[index]`` now triggers shrinking the list's internal array.
diff --git a/Objects/listobject.c b/Objects/listobject.c
index 87a669f203589d..a4ad1094ba51ce 100644
--- a/Objects/listobject.c
+++ b/Objects/listobject.c
@@ -1182,7 +1182,7 @@ list_ass_item_lock_held(PyListObject *a, Py_ssize_t i,
PyObject *v)
if (i < size - 1) {
list_shift_items_left_lock_held(a, i, size - 1);
}
- Py_SET_SIZE(a, size - 1);
+ list_resize(a, size - 1); // NB: shrinking a list can't fail
}
else {
FT_ATOMIC_STORE_PTR_RELEASE(a->ob_item[i], Py_NewRef(v));
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