Michael Hudson pointed out that the Dialect_Type object isn't INCREF'd. Why

this worked is a bit mystical.  Perhaps it never gets freed because the
object just happens never to be DECREF'd (but that seems unlikely).

diff --git a/Modules/_csv.c b/Modules/_csv.c
index 79870c0490837ce4cdc6ec9d367f5e4792c542ca..da5ae0d238d6774b9a46f73d3e43b50591e0bfa2 100644 (file)
--- a/Modules/_csv.c
+++ b/Modules/_csv.c
@@ -1587,6 +1587,7 @@ init_csv(void)
        }
 
         /* Add the Dialect type */
+       Py_INCREF(&Dialect_Type);
         if (PyModule_AddObject(module, "Dialect", (PyObject *)&Dialect_Type))
                 return;