gh-113212: Improve super() error message.

WolframAlph · WolframAlph · commit 3b7e6fddb77b · 2023-12-20T09:26:53.000+01:00
diff --git a/Objects/typeobject.c b/Objects/typeobject.c
@@ -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;
 }
 

Original file line number	Diff line number	Diff line change
`@@ -10389,9 +10389,13 @@ supercheck(PyTypeObject type, PyObject obj)`
`10389`	`10389`	`Py_XDECREF(class_attr);`
`10390`	`10390`	`}`
`10391`	`10391`
`10392`		`- PyErr_SetString(PyExc_TypeError,`
	`10392`	`+ PyErr_Format(PyExc_TypeError,`
`10393`	`10393`	`"super(type, obj): "`
`10394`		`- "obj must be an instance or subtype of type");`
	`10394`	`+ "obj must be an instance or subtype of type. "`
	`10395`	`+ "Got obj: '%.200s', type: '%.200s'.",`
	`10396`	`+ PyType_Check(obj) ? ((PyTypeObject*)obj)->tp_name : Py_TYPE(obj)->tp_name,`
	`10397`	`+ type->tp_name);`
	`10398`	`+`
`10395`	`10399`	`return NULL;`
`10396`	`10400`	`}`
`10397`	`10401`