adjust formatting

Objects/typeobject.c

@@ -458,9 +458,9 @@ type_set_bases(PyTypeObject *type, PyObject *value, void *context)
     for (i = 0; i < PyTuple_GET_SIZE(value); i++) {
         ob = PyTuple_GET_ITEM(value, i);
         if (!PyType_Check(ob)) {
-            PyErr_Format(
-                PyExc_TypeError,
-    "%s.__bases__ must be tuple of old- or new-style classes, not '%s'",
+            PyErr_Format(PyExc_TypeError,
+                         "%s.__bases__ must be tuple of old- or "
+                         "new-style classes, not '%s'",
                          type->tp_name, Py_TYPE(ob)->tp_name);
             return -1;
         }