show noddy.Noddy refcount

Author: rwgk

noddy/noddy_heaptype_py2.c

@@ -37,6 +37,6 @@ initnoddy(void)
     nt->tp_doc = "Noddy objects";
     if (PyType_Ready(nt) < 0)
         return;
-
+    Py_INCREF(nt);  /* For PyModule_AddObject to steal. */
     PyModule_AddObject(m, "Noddy", (PyObject *) nt);
 }

noddy/noddy_heaptype_py3.c

@@ -37,7 +37,7 @@ PyInit_noddy(void)
     nt->tp_doc = "Noddy objects";
     if (PyType_Ready(nt) < 0)
         return NULL;
-
+    Py_INCREF(nt);  /* For PyModule_AddObject to steal. */
     PyModule_AddObject(m, "Noddy", (PyObject *) nt);
     return m;
 }

noddy/noddy_main.py

@@ -2,6 +2,7 @@
 from __future__ import division
 from __future__ import print_function
 
+import gc
 import sys
 
 import noddy
@@ -17,6 +18,10 @@ class NoddyPlus(noddy.Noddy):
   NoddyPlus = None
 
 
+def show_refcount():
+  print('REFCOUNT:', sys.getrefcount(noddy.Noddy))
+
+
 def exercise(output):
   output(noddy)
   output(dir(noddy))
@@ -32,12 +37,23 @@ def exercise(output):
 
 
 def run(args):
+  print(sys.version)
+  show_refcount()
   exercise(print)
+  show_refcount()
+  objs = []
+  for unused_index in range(10):
+    objs.append(noddy.Noddy())
+    show_refcount()
+  del objs
+  gc.collect()
+  show_refcount()
   if args:
     while True:
       def noop(unused_obj):
         pass
       exercise(noop)
+  show_refcount()
 
 
 if __name__ == '__main__':