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bpo-36781: Optimize sum() for bools. (#13074)

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* Optimize sum() for bools.

* Fix sum([], False).

* Add a NEWS entry.
This commit is contained in:
Serhiy Storchaka 2019-09-10 16:31:01 +03:00 • committed by Dino Viehland
parent c1d8c1cb8e
commit 88bdb9280b
3 changed files with 24 additions and 2 deletions
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4
Python/bltinmodule.c
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@ -2342,7 +2342,7 @@ builtin_sum_impl(PyObject *module, PyObject *iterable, PyObject *start)
return NULL;
return PyLong_FromLong(i_result);
}
if (PyLong_CheckExact(item)) {
if (PyLong_CheckExact(item) || PyBool_Check(item)) {
long b = PyLong_AsLongAndOverflow(item, &overflow);
if (overflow == 0 &&
(i_result >= 0 ? (b <= LONG_MAX - i_result)
@ -2390,7 +2390,7 @@ builtin_sum_impl(PyObject *module, PyObject *iterable, PyObject *start)
Py_DECREF(item);
continue;
}
if (PyLong_CheckExact(item)) {
if (PyLong_Check(item)) {
long value;
int overflow;
value = PyLong_AsLongAndOverflow(item, &overflow);