Apply pre-sizing optimization to a broader class of objects.
Formerly, the length was only fetched from sequence objects.
Now, any object that reports its length can benefit from pre-sizing.
diff --git a/Objects/abstract.c b/Objects/abstract.c
index 1259ad4..342d971 100644
--- a/Objects/abstract.c
+++ b/Objects/abstract.c
@@ -1448,15 +1448,11 @@
return NULL;
/* Guess a result list size. */
- n = -1; /* unknown */
- if (PySequence_Check(v) &&
- v->ob_type->tp_as_sequence->sq_length) {
- n = PySequence_Size(v);
- if (n < 0)
- PyErr_Clear();
- }
- if (n < 0)
+ n = PyObject_Size(v);
+ if (n < 0) {
+ PyErr_Clear();
n = 8; /* arbitrary */
+ }
result = PyList_New(n);
if (result == NULL) {
Py_DECREF(it);