commit 14d80d0b605d8b148e14458e4c1853a940071462
author Dong-hee Na <donghee.na92@gmail.com> Thu Jan 23 02:36:54 2020 +0900
committer Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Wed Jan 22 09:36:54 2020 -0800
tree 33744b05eb3ab98d8c74a25c998173aad5cc27ee
parent 5bbac8cbdf140ebce446ea4e7db2b20a5d7b8402

bpo-39425: Fix list.count performance regression (GH-18119)



https://bugs.python.org/issue39425



Automerge-Triggered-By: @pablogsal

Objects/listobject.c

diff --git a/Objects/listobject.c b/Objects/listobject.c
index bc8425c..a4e90db 100644
--- a/Objects/listobject.c
+++ b/Objects/listobject.c
@@ -2584,6 +2584,10 @@
 
     for (i = 0; i < Py_SIZE(self); i++) {
         PyObject *obj = self->ob_item[i];
+        if (obj == value) {
+           count++;
+           continue;
+        }
         Py_INCREF(obj);
         int cmp = PyObject_RichCompareBool(obj, value, Py_EQ);
         Py_DECREF(obj);