python
diff --git a/‎Objects/typeobject.c
Copy file name to clipboardExpand all lines: Objects/typeobject.c
+6-2Lines changed: 6 additions & 2 deletions b/‎Objects/typeobject.c
Copy file name to clipboardExpand all lines: Objects/typeobject.c
+6-2Lines changed: 6 additions & 2 deletions
@@ -10389,9 +10389,13 @@ supercheck(PyTypeObject *type, PyObject *obj)
         Py_XDECREF(class_attr);
     }
 
-    PyErr_SetString(PyExc_TypeError,
+    PyErr_Format(PyExc_TypeError,
                     "super(type, obj): "
-                    "obj must be an instance or subtype of type");
+                    "obj must be an instance or subtype of type. "
+                    "Got obj: '%.200s', type: '%.200s'.", 
+                    PyType_Check(obj) ? ((PyTypeObject*)obj)->tp_name : Py_TYPE(obj)->tp_name,
+                    type->tp_name);
+
     return NULL;
 }