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gh-140009: Improve performance of list_extend_dictitems by using PyTuple_FromArray (#140010)

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Pieter Eendebak 2025-10-13 12:28:25 +02:00 • committed by GitHub
parent 0344db8d60
commit e6aa515296
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2 changed files with 4 additions and 3 deletions
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Misc/NEWS.d/next/Core_and_Builtins/2025-10-12-18-54-06.gh-issue-140009.-MbFh_.rst Normal file
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@ -0,0 +1 @@
Improve performance of list extension by dictionary items.

6
Objects/listobject.c
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@ -1382,9 +1382,9 @@ list_extend_dictitems(PyListObject *self, PyDictObject *dict)
PyObject **dest = self->ob_item + m;
Py_ssize_t pos = 0;
Py_ssize_t i = 0;
PyObject *key, *value;
while (_PyDict_Next((PyObject *)dict, &pos, &key, &value, NULL)) {
PyObject *item = PyTuple_Pack(2, key, value);
PyObject *key_value[2];
while (_PyDict_Next((PyObject *)dict, &pos, &key_value[0], &key_value[1], NULL)) {
PyObject *item = PyTuple_FromArray(key_value, 2);
if (item == NULL) {
Py_SET_SIZE(self, m + i);
return -1;