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

31aca4bf · Oren Milman · Raymond Hettinger · c740e4fe · 31aca4bf
Kaydet (Commit) 31aca4bf authored Eyl 27, 2017 tarafından Oren Milman Kaydeden (comit) Raymond Hettinger Eyl 27, 2017
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_collectionsmodule.c Modules/_collectionsmodule.c +3 -1

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--- 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