From: Oren Milman <orenmn@gmail.com>
Date: Wed, 27 Sep 2017 03:18:21 +0000 (+0300)
Subject: bpo-31586: Use _count_element fast path for real dicts.
X-Git-Tag: v3.7.0a2~106
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=31aca4bf79217e6ec4c1d056d3ad7ed4dd469c78;p=python

bpo-31586: Use _count_element fast path for real dicts.
---

diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c
index e78399ddef..b6cceee27f 100644
--- a/Modules/_collectionsmodule.c
+++ b/Modules/_collectionsmodule.c
@@ -2277,7 +2277,9 @@ _count_elements(PyObject *self, PyObject *args)
     dict_setitem = _PyType_LookupId(&PyDict_Type, &PyId___setitem__);
 
     if (mapping_get != NULL && mapping_get == dict_get &&
-        mapping_setitem != NULL && mapping_setitem == dict_setitem) {
+        mapping_setitem != NULL && mapping_setitem == dict_setitem &&
+        PyDict_Check(mapping))
+    {
         while (1) {
             /* Fast path advantages:
                    1. Eliminate double hashing