bpo-34320: Fix dict(o) didn't copy order of dict subclass (GH-8624)
When dict subclass overrides order (`__iter__()`, `keys()`, and `items()`), `dict(o)`
should use it instead of dict ordering.
https://bugs.python.org/issue34320
diff --git a/Objects/dictobject.c b/Objects/dictobject.c
index 413557d..fec6967 100644
--- a/Objects/dictobject.c
+++ b/Objects/dictobject.c
@@ -235,6 +235,8 @@
static int dictresize(PyDictObject *mp, Py_ssize_t minused);
+static PyObject* dict_iter(PyDictObject *dict);
+
/*Global counter used to set ma_version_tag field of dictionary.
* It is incremented each time that a dictionary is created and each
* time that a dictionary is modified. */
@@ -2379,7 +2381,7 @@
return -1;
}
mp = (PyDictObject*)a;
- if (PyDict_Check(b)) {
+ if (PyDict_Check(b) && (Py_TYPE(b)->tp_iter == (getiterfunc)dict_iter)) {
other = (PyDictObject*)b;
if (other == mp || other->ma_used == 0)
/* a.update(a) or a.update({}); nothing to do */