bpo-39829: __len__ called twice in the list() constructor

thatbirdguythatuknownot · web-flow · commit ac00535bb1ec · 2022-03-08T13:44:15.000+08:00
diff --git a/Objects/listobject.c b/Objects/listobject.c
@@ -894,6 +894,7 @@ list_extend(PyListObject *self, PyObject *iterable)
                 Py_DECREF(iterable);
                 return NULL;
             }
+        }
         else {
             if (list_resize(self, m + n) < 0) {
                 Py_DECREF(iterable);

Original file line number	Diff line number	Diff line change
`@@ -894,6 +894,7 @@ list_extend(PyListObject self, PyObject iterable)`
`894`	`894`	`Py_DECREF(iterable);`
`895`	`895`	`return NULL;`
`896`	`896`	`}`
	`897`	`+ }`
`897`	`898`	`else {`
`898`	`899`	`if (list_resize(self, m + n) < 0) {`
`899`	`900`	`Py_DECREF(iterable);`