Merged revisions 56467-56482 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/p3yk

................
  r56477 | martin.v.loewis | 2007-07-21 09:04:38 +0200 (Sa, 21 Jul 2007) | 11 lines

  Merged revisions 56466-56476 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

  ........
    r56476 | martin.v.loewis | 2007-07-21 08:55:02 +0200 (Sa, 21 Jul 2007) | 4 lines

    PEP 3123: Provide forward compatibility with Python 3.0, while keeping
    backwards compatibility. Add Py_Refcnt, Py_Type, Py_Size, and
    PyVarObject_HEAD_INIT.
  ........
................
  r56478 | martin.v.loewis | 2007-07-21 09:47:23 +0200 (Sa, 21 Jul 2007) | 2 lines

  PEP 3123: Use proper C inheritance for PyObject.
................
  r56479 | martin.v.loewis | 2007-07-21 10:06:55 +0200 (Sa, 21 Jul 2007) | 3 lines

  Add longintrepr.h to Python.h, so that the compiler can
  see that PyFalse is really some kind of PyObject*.
................
  r56480 | martin.v.loewis | 2007-07-21 10:47:18 +0200 (Sa, 21 Jul 2007) | 2 lines

  Qualify SHIFT, MASK, BASE.
................
  r56482 | martin.v.loewis | 2007-07-21 19:10:57 +0200 (Sa, 21 Jul 2007) | 2 lines

  Correctly refer to _ob_next.
................
diff --git a/Modules/_bsddb.c b/Modules/_bsddb.c
index d569b7d..a5c6ed7 100644
--- a/Modules/_bsddb.c
+++ b/Modules/_bsddb.c
@@ -300,13 +300,13 @@
 
 static PyTypeObject DB_Type, DBCursor_Type, DBEnv_Type, DBTxn_Type, DBLock_Type;
 
-#define DBObject_Check(v)           ((v)->ob_type == &DB_Type)
-#define DBCursorObject_Check(v)     ((v)->ob_type == &DBCursor_Type)
-#define DBEnvObject_Check(v)        ((v)->ob_type == &DBEnv_Type)
-#define DBTxnObject_Check(v)        ((v)->ob_type == &DBTxn_Type)
-#define DBLockObject_Check(v)       ((v)->ob_type == &DBLock_Type)
+#define DBObject_Check(v)           (Py_Type(v) == &DB_Type)
+#define DBCursorObject_Check(v)     (Py_Type(v) == &DBCursor_Type)
+#define DBEnvObject_Check(v)        (Py_Type(v) == &DBEnv_Type)
+#define DBTxnObject_Check(v)        (Py_Type(v) == &DBTxn_Type)
+#define DBLockObject_Check(v)       (Py_Type(v) == &DBLock_Type)
 #if (DBVER >= 43)
-#define DBSequenceObject_Check(v)   ((v)->ob_type == &DBSequence_Type)
+#define DBSequenceObject_Check(v)   (Py_Type(v) == &DBSequence_Type)
 #endif
 
 
@@ -461,7 +461,7 @@
     else {
         PyErr_Format(PyExc_TypeError,
                      "String or Integer object expected for key, %s found",
-                     keyobj->ob_type->tp_name);
+                     Py_Type(keyobj)->tp_name);
         return 0;
     }
 
@@ -616,7 +616,7 @@
 static void makeTypeError(char* expected, PyObject* found)
 {
     PyErr_Format(PyExc_TypeError, "Expected %s argument, %s found.",
-                 expected, found->ob_type->tp_name);
+                 expected, Py_Type(found)->tp_name);
 }
 
 
@@ -5369,8 +5369,7 @@
 #endif
 
 static PyTypeObject DB_Type = {
-    PyObject_HEAD_INIT(NULL)
-    0,                  /*ob_size*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "DB",               /*tp_name*/
     sizeof(DBObject),   /*tp_basicsize*/
     0,                  /*tp_itemsize*/
@@ -5402,8 +5401,7 @@
 
 
 static PyTypeObject DBCursor_Type = {
-    PyObject_HEAD_INIT(NULL)
-    0,                  /*ob_size*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "DBCursor",         /*tp_name*/
     sizeof(DBCursorObject),  /*tp_basicsize*/
     0,                  /*tp_itemsize*/
@@ -5435,8 +5433,7 @@
 
 
 static PyTypeObject DBEnv_Type = {
-    PyObject_HEAD_INIT(NULL)
-    0,          /*ob_size*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "DBEnv",            /*tp_name*/
     sizeof(DBEnvObject),    /*tp_basicsize*/
     0,          /*tp_itemsize*/
@@ -5467,8 +5464,7 @@
 };
 
 static PyTypeObject DBTxn_Type = {
-    PyObject_HEAD_INIT(NULL)
-    0,          /*ob_size*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "DBTxn",    /*tp_name*/
     sizeof(DBTxnObject),  /*tp_basicsize*/
     0,          /*tp_itemsize*/
@@ -5500,8 +5496,7 @@
 
 
 static PyTypeObject DBLock_Type = {
-    PyObject_HEAD_INIT(NULL)
-    0,          /*ob_size*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "DBLock",   /*tp_name*/
     sizeof(DBLockObject),  /*tp_basicsize*/
     0,          /*tp_itemsize*/
@@ -5533,8 +5528,7 @@
 
 #if (DBVER >= 43)
 static PyTypeObject DBSequence_Type = {
-    PyObject_HEAD_INIT(NULL)
-    0,          /*ob_size*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "DBSequence",                   /*tp_name*/
     sizeof(DBSequenceObject),       /*tp_basicsize*/
     0,          /*tp_itemsize*/
@@ -5666,13 +5660,13 @@
 
     /* Initialize the type of the new type objects here; doing it here
        is required for portability to Windows without requiring C++. */
-    DB_Type.ob_type = &PyType_Type;
-    DBCursor_Type.ob_type = &PyType_Type;
-    DBEnv_Type.ob_type = &PyType_Type;
-    DBTxn_Type.ob_type = &PyType_Type;
-    DBLock_Type.ob_type = &PyType_Type;
+    Py_Type(&DB_Type) = &PyType_Type;
+    Py_Type(&DBCursor_Type) = &PyType_Type;
+    Py_Type(&DBEnv_Type) = &PyType_Type;
+    Py_Type(&DBTxn_Type) = &PyType_Type;
+    Py_Type(&DBLock_Type) = &PyType_Type;
 #if (DBVER >= 43)    
-    DBSequence_Type.ob_type = &PyType_Type;
+    Py_Type(&DBSequence_Type) = &PyType_Type;
 #endif    
 
 
diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c
index fc4ef15..e454231 100644
--- a/Modules/_collectionsmodule.c
+++ b/Modules/_collectionsmodule.c
@@ -544,7 +544,7 @@
 	}
 	deque->leftblock = NULL;
 	deque->rightblock = NULL;
-	deque->ob_type->tp_free(deque);
+	Py_Type(deque)->tp_free(deque);
 }
 
 static int
@@ -579,7 +579,7 @@
 static PyObject *
 deque_copy(PyObject *deque)
 {
-	return PyObject_CallFunctionObjArgs((PyObject *)(deque->ob_type),
+	return PyObject_CallFunctionObjArgs((PyObject *)(Py_Type(deque)),
 		deque, NULL);
 }
 
@@ -601,7 +601,7 @@
 		Py_DECREF(dict);
 		return NULL;
 	}
-	result = Py_BuildValue("O()ON", deque->ob_type, dict, it);
+	result = Py_BuildValue("O()ON", Py_Type(deque), dict, it);
 	Py_DECREF(dict);
 	return result;
 }
@@ -818,8 +818,7 @@
 Build an ordered collection accessible from endpoints only.");
 
 static PyTypeObject deque_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"collections.deque",		/* tp_name */
 	sizeof(dequeobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -896,7 +895,7 @@
 dequeiter_dealloc(dequeiterobject *dio)
 {
 	Py_XDECREF(dio->deque);
-	dio->ob_type->tp_free(dio);
+	Py_Type(dio)->tp_free(dio);
 }
 
 static PyObject *
@@ -941,8 +940,7 @@
 };
 
 PyTypeObject dequeiter_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"deque_iterator",			/* tp_name */
 	sizeof(dequeiterobject),		/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -1024,8 +1022,7 @@
 }
 
 PyTypeObject dequereviter_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"deque_reverse_iterator",		/* tp_name */
 	sizeof(dequeiterobject),		/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -1106,7 +1103,7 @@
 	   whose class constructor has the same signature.  Subclasses that
 	   define a different constructor signature must override copy().
 	*/
-	return PyObject_CallFunctionObjArgs((PyObject *)dd->dict.ob_type,
+	return PyObject_CallFunctionObjArgs(Py_Type(dd),
 					    dd->default_factory, dd, NULL);
 }
 
@@ -1149,7 +1146,7 @@
 		Py_DECREF(args);
 		return NULL;
 	}
-	result = PyTuple_Pack(5, dd->dict.ob_type, args,
+	result = PyTuple_Pack(5, Py_Type(dd), args,
 			      Py_None, Py_None, items);
 	Py_DECREF(items);
 	Py_DECREF(args);
@@ -1274,8 +1271,7 @@
 #define DEFERRED_ADDRESS(ADDR) 0
 
 static PyTypeObject defdict_type = {
-	PyObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type))
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type), 0)
 	"collections.defaultdict",	/* tp_name */
 	sizeof(defdictobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
diff --git a/Modules/_csv.c b/Modules/_csv.c
index e3dca2c..246cc6c 100644
--- a/Modules/_csv.c
+++ b/Modules/_csv.c
@@ -125,7 +125,7 @@
 
 static PyTypeObject Reader_Type;
 
-#define ReaderObject_Check(v)   ((v)->ob_type == &Reader_Type)
+#define ReaderObject_Check(v)   (Py_Type(v) == &Reader_Type)
 
 typedef struct {
         PyObject_HEAD
@@ -310,7 +310,7 @@
 Dialect_dealloc(DialectObj *self)
 {
         Py_XDECREF(self->lineterminator);
-        self->ob_type->tp_free((PyObject *)self);
+        Py_Type(self)->tp_free((PyObject *)self);
 }
 
 static char *dialect_kws[] = {
@@ -460,8 +460,7 @@
 "The Dialect type records CSV parsing and generation options.\n");
 
 static PyTypeObject Dialect_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,                                      /* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_csv.Dialect",                         /* tp_name */
 	sizeof(DialectObj),                     /* tp_basicsize */
 	0,                                      /* tp_itemsize */
@@ -869,8 +868,7 @@
 
 
 static PyTypeObject Reader_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,                                      /*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_csv.reader",                          /*tp_name*/
 	sizeof(ReaderObj),                      /*tp_basicsize*/
 	0,                                      /*tp_itemsize*/
@@ -1280,8 +1278,7 @@
 );
 
 static PyTypeObject Writer_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,                                      /*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_csv.writer",                          /*tp_name*/
 	sizeof(WriterObj),                      /*tp_basicsize*/
 	0,                                      /*tp_itemsize*/
diff --git a/Modules/_ctypes/_ctypes.c b/Modules/_ctypes/_ctypes.c
index 0350be3..e1b03a0 100644
--- a/Modules/_ctypes/_ctypes.c
+++ b/Modules/_ctypes/_ctypes.c
@@ -328,7 +328,7 @@
 			Py_INCREF(value);
 			return value;
 		}
-		ob_name = (ob) ? ob->ob_type->tp_name : "???";
+		ob_name = (ob) ? Py_Type(ob)->tp_name : "???";
 		PyErr_Format(PyExc_TypeError,
 			     "expected %s instance instead of pointer to %s",
 			     ((PyTypeObject *)type)->tp_name, ob_name);
@@ -344,7 +344,7 @@
 	PyErr_Format(PyExc_TypeError,
 		     "expected %s instance instead of %s",
 		     ((PyTypeObject *)type)->tp_name,
-		     value->ob_type->tp_name);
+		     Py_Type(value)->tp_name);
 	return NULL;
 }
 
@@ -427,8 +427,7 @@
 
 
 PyTypeObject StructType_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes.StructType",			/* tp_name */
 	0,					/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -470,8 +469,7 @@
 };
 
 static PyTypeObject UnionType_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes.UnionType",			/* tp_name */
 	0,					/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -685,8 +683,7 @@
 };
 
 PyTypeObject PointerType_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes.PointerType",				/* tp_name */
 	0,					/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -743,7 +740,7 @@
 	char *ptr;
 	Py_ssize_t size;
 	if (PyBuffer_Check(value)) {
-		size = value->ob_type->tp_as_buffer->bf_getreadbuffer(value, 0, (void *)&ptr);
+		size = Py_Type(value)->tp_as_buffer->bf_getreadbuffer(value, 0, (void *)&ptr);
 		if (size < 0)
 			return -1;
 	} else if (-1 == PyString_AsStringAndSize(value, &ptr, &size)) {
@@ -792,7 +789,7 @@
 	} else if (!PyBytes_Check(value)) {
 		PyErr_Format(PyExc_TypeError,
 			     "str/bytes expected instead of %s instance",
-			     value->ob_type->tp_name);
+			     Py_Type(value)->tp_name);
 		return -1;
 	} else
 		Py_INCREF(value);
@@ -847,7 +844,7 @@
 	} else if (!PyUnicode_Check(value)) {
 		PyErr_Format(PyExc_TypeError,
 				"unicode string expected instead of %s instance",
-				value->ob_type->tp_name);
+				Py_Type(value)->tp_name);
 		return -1;
 	} else
 		Py_INCREF(value);
@@ -1043,8 +1040,7 @@
 }
 
 PyTypeObject ArrayType_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes.ArrayType",			/* tp_name */
 	0,					/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -1682,8 +1678,7 @@
 };
 
 PyTypeObject SimpleType_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes.SimpleType",				/* tp_name */
 	0,					/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -1893,8 +1888,7 @@
 }
 
 PyTypeObject CFuncPtrType_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes.CFuncPtrType",			/* tp_name */
 	0,					/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -2062,7 +2056,7 @@
 CData_dealloc(PyObject *self)
 {
 	CData_clear((CDataObject *)self);
-	self->ob_type->tp_free(self);
+	Py_Type(self)->tp_free(self);
 }
 
 static PyMemberDef CData_members[] = {
@@ -2129,8 +2123,7 @@
 };
 
 PyTypeObject CData_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes._CData",
 	sizeof(CDataObject),			/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -2336,7 +2329,7 @@
 			PyErr_Format(PyExc_TypeError,
 				     "expected %s instance, got %s",
 				     ((PyTypeObject *)type)->tp_name,
-				     value->ob_type->tp_name);
+				     Py_Type(value)->tp_name);
 			return NULL;
 		}
 	}
@@ -2367,7 +2360,7 @@
 		if (p1->proto != p2->proto) {
 			PyErr_Format(PyExc_TypeError,
 				     "incompatible types, %s instance instead of %s instance",
-				     value->ob_type->tp_name,
+				     Py_Type(value)->tp_name,
 				     ((PyTypeObject *)type)->tp_name);
 			return NULL;
 		}
@@ -2386,7 +2379,7 @@
 	}
 	PyErr_Format(PyExc_TypeError,
 		     "incompatible types, %s instance instead of %s instance",
-		     value->ob_type->tp_name,
+		     Py_Type(value)->tp_name,
 		     ((PyTypeObject *)type)->tp_name);
 	return NULL;
 }
@@ -2647,7 +2640,7 @@
 		     Py_SAFE_DOWNCAST(index, Py_ssize_t, int),
 		     PyType_Check(arg) ?
 		     ((PyTypeObject *)arg)->tp_name :
-		     arg->ob_type->tp_name);
+		     Py_Type(arg)->tp_name);
 	return 0;
 }
 
@@ -3429,7 +3422,7 @@
 CFuncPtr_dealloc(CFuncPtrObject *self)
 {
 	CFuncPtr_clear(self);
-	self->ob_type->tp_free((PyObject *)self);
+	Py_Type(self)->tp_free((PyObject *)self);
 }
 
 static PyObject *
@@ -3439,17 +3432,16 @@
 	if (self->index)
 		return PyUnicode_FromFormat("<COM method offset %d: %s at %p>",
 					   self->index - 0x1000,
-					   self->ob_type->tp_name,
+					   Py_Type(self)->tp_name,
 					   self);
 #endif
 	return PyUnicode_FromFormat("<%s object at %p>",
-				   self->ob_type->tp_name,
+				   Py_Type(self)->tp_name,
 				   self);
 }
 
 PyTypeObject CFuncPtr_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes.CFuncPtr",
 	sizeof(CFuncPtrObject),			/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -3577,8 +3569,7 @@
 }
 
 static PyTypeObject Struct_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes.Structure",
 	sizeof(CDataObject),			/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -3620,8 +3611,7 @@
 };
 
 static PyTypeObject Union_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes.Union",
 	sizeof(CDataObject),			/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -3853,8 +3843,7 @@
 };
 
 PyTypeObject Array_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes.Array",
 	sizeof(CDataObject),			/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -3999,7 +3988,7 @@
 static PyObject *
 Simple_from_outparm(PyObject *self, PyObject *args)
 {
-	if (IsSimpleSubType((PyObject *)self->ob_type)) {
+	if (IsSimpleSubType((PyObject *)Py_Type(self))) {
 		Py_INCREF(self);
 		return self;
 	}
@@ -4037,9 +4026,9 @@
 	PyObject *val, *name, *args, *result;
 	static PyObject *format;
 
-	if (self->ob_type->tp_base != &Simple_Type) {
+	if (Py_Type(self)->tp_base != &Simple_Type) {
 		return PyUnicode_FromFormat("<%s object at %p>",
-					   self->ob_type->tp_name, self);
+					   Py_Type(self)->tp_name, self);
 	}
 
 	if (format == NULL) {
@@ -4070,8 +4059,7 @@
 }
 
 static PyTypeObject Simple_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes._SimpleCData",
 	sizeof(CDataObject),			/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -4224,7 +4212,7 @@
 		PyErr_Format(PyExc_TypeError,
 			     "expected %s instead of %s",
 			     ((PyTypeObject *)(stgdict->proto))->tp_name,
-			     value->ob_type->tp_name);
+			     Py_Type(value)->tp_name);
 		return -1;
 	}
 
@@ -4352,8 +4340,7 @@
 };
 
 PyTypeObject Pointer_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes._Pointer",
 	sizeof(CDataObject),			/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -4531,7 +4518,7 @@
 		     "cast() argument 2 must be a pointer type, not %s",
 		     PyType_Check(arg)
 		     ? ((PyTypeObject *)arg)->tp_name
-		     : arg->ob_type->tp_name);
+		     : Py_Type(arg)->tp_name);
 	return 0;
 }
 
@@ -4658,37 +4645,37 @@
 	if (PyType_Ready(&CData_Type) < 0)
 		return;
 
-	Struct_Type.ob_type = &StructType_Type;
+	Py_Type(&Struct_Type) = &StructType_Type;
 	Struct_Type.tp_base = &CData_Type;
 	if (PyType_Ready(&Struct_Type) < 0)
 		return;
 	PyModule_AddObject(m, "Structure", (PyObject *)&Struct_Type);
 
-	Union_Type.ob_type = &UnionType_Type;
+	Py_Type(&Union_Type) = &UnionType_Type;
 	Union_Type.tp_base = &CData_Type;
 	if (PyType_Ready(&Union_Type) < 0)
 		return;
 	PyModule_AddObject(m, "Union", (PyObject *)&Union_Type);
 
-	Pointer_Type.ob_type = &PointerType_Type;
+	Py_Type(&Pointer_Type) = &PointerType_Type;
 	Pointer_Type.tp_base = &CData_Type;
 	if (PyType_Ready(&Pointer_Type) < 0)
 		return;
 	PyModule_AddObject(m, "_Pointer", (PyObject *)&Pointer_Type);
 
-	Array_Type.ob_type = &ArrayType_Type;
+	Py_Type(&Array_Type) = &ArrayType_Type;
 	Array_Type.tp_base = &CData_Type;
 	if (PyType_Ready(&Array_Type) < 0)
 		return;
 	PyModule_AddObject(m, "Array", (PyObject *)&Array_Type);
 
-	Simple_Type.ob_type = &SimpleType_Type;
+	Py_Type(&Simple_Type) = &SimpleType_Type;
 	Simple_Type.tp_base = &CData_Type;
 	if (PyType_Ready(&Simple_Type) < 0)
 		return;
 	PyModule_AddObject(m, "_SimpleCData", (PyObject *)&Simple_Type);
 
-	CFuncPtr_Type.ob_type = &CFuncPtrType_Type;
+	Py_Type(&CFuncPtr_Type) = &CFuncPtrType_Type;
 	CFuncPtr_Type.tp_base = &CData_Type;
 	if (PyType_Ready(&CFuncPtr_Type) < 0)
 		return;
diff --git a/Modules/_ctypes/callproc.c b/Modules/_ctypes/callproc.c
index 61be77b..3a98a74 100644
--- a/Modules/_ctypes/callproc.c
+++ b/Modules/_ctypes/callproc.c
@@ -376,8 +376,7 @@
 };
 
 PyTypeObject PyCArg_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"CArgObject",
 	sizeof(PyCArgObject),
 	0,
@@ -1169,7 +1168,7 @@
 	if (!CDataObject_Check(pcom) || (pcom->b_size != sizeof(void *))) {
 		PyErr_Format(PyExc_TypeError,
 			     "COM Pointer expected instead of %s instance",
-			     pcom->ob_type->tp_name);
+			     Py_Type(pcom)->tp_name);
 		return NULL;
 	}
 
@@ -1409,7 +1408,7 @@
 	if (!CDataObject_Check(obj)) {
 		PyErr_Format(PyExc_TypeError,
 			     "byref() argument must be a ctypes instance, not '%s'",
-			     obj->ob_type->tp_name);
+			     Py_Type(obj)->tp_name);
 		return NULL;
 	}
 
diff --git a/Modules/_ctypes/cfield.c b/Modules/_ctypes/cfield.c
index bfb320e..cc94850 100644
--- a/Modules/_ctypes/cfield.c
+++ b/Modules/_ctypes/cfield.c
@@ -274,8 +274,7 @@
 }
 
 PyTypeObject CField_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes.CField",				/* tp_name */
 	sizeof(CFieldObject),			/* tp_basicsize */
 	0,					/* tp_itemsize */
diff --git a/Modules/_ctypes/stgdict.c b/Modules/_ctypes/stgdict.c
index b4a6e87..3f330f0 100644
--- a/Modules/_ctypes/stgdict.c
+++ b/Modules/_ctypes/stgdict.c
@@ -79,8 +79,7 @@
 }
 
 PyTypeObject StgDict_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"StgDict",
 	sizeof(StgDictObject),
 	0,
@@ -184,7 +183,7 @@
 			Py_DECREF(fieldlist);
 			return -1;
 		}
-		if (fdescr->ob_type != &CField_Type) {
+		if (Py_Type(fdescr) != &CField_Type) {
 			PyErr_SetString(PyExc_TypeError, "unexpected type");
 			Py_DECREF(fdescr);
 			Py_DECREF(fieldlist);
@@ -207,7 +206,7 @@
 			Py_DECREF(fieldlist);
 			return -1;
 		}
-		assert(new_descr->ob_type == &CField_Type);
+		assert(Py_Type(new_descr) == &CField_Type);
  		new_descr->size = fdescr->size;
  		new_descr->offset = fdescr->offset + offset;
  		new_descr->index = fdescr->index + index;
@@ -255,7 +254,7 @@
 			Py_DECREF(anon_names);
 			return -1;
 		}
-		assert(descr->ob_type == &CField_Type);
+		assert(Py_Type(descr) == &CField_Type);
 		descr->anonymous = 1;
 
 		/* descr is in the field descriptor. */
diff --git a/Modules/_curses_panel.c b/Modules/_curses_panel.c
index 0acf3fd..5eb4cf8 100644
--- a/Modules/_curses_panel.c
+++ b/Modules/_curses_panel.c
@@ -56,7 +56,7 @@
 
 PyTypeObject PyCursesPanel_Type;
 
-#define PyCursesPanel_Check(v)	 ((v)->ob_type == &PyCursesPanel_Type)
+#define PyCursesPanel_Check(v)	 (Py_Type(v) == &PyCursesPanel_Type)
 
 /* Some helper functions. The problem is that there's always a window
    associated with a panel. To ensure that Python's GC doesn't pull
@@ -338,8 +338,7 @@
 /* -------------------------------------------------------*/
 
 PyTypeObject PyCursesPanel_Type = {
-    PyObject_HEAD_INIT(NULL)
-    0,			/*ob_size*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "_curses_panel.curses panel",	/*tp_name*/
     sizeof(PyCursesPanelObject),	/*tp_basicsize*/
     0,			/*tp_itemsize*/
@@ -458,7 +457,7 @@
     PyObject *m, *d, *v;
 
     /* Initialize object type */
-    PyCursesPanel_Type.ob_type = &PyType_Type;
+    Py_Type(&PyCursesPanel_Type) = &PyType_Type;
 
     import_curses();
 
diff --git a/Modules/_cursesmodule.c b/Modules/_cursesmodule.c
index 7981d51..d77cd2d 100644
--- a/Modules/_cursesmodule.c
+++ b/Modules/_cursesmodule.c
@@ -1567,8 +1567,7 @@
 /* -------------------------------------------------------*/
 
 PyTypeObject PyCursesWindow_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,			/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_curses.curses window",	/*tp_name*/
 	sizeof(PyCursesWindowObject),	/*tp_basicsize*/
 	0,			/*tp_itemsize*/
@@ -2660,7 +2659,7 @@
 	static void *PyCurses_API[PyCurses_API_pointers];
 
 	/* Initialize object type */
-	PyCursesWindow_Type.ob_type = &PyType_Type;
+	Py_Type(&PyCursesWindow_Type) = &PyType_Type;
 
 	/* Initialize the C API pointer array */
 	PyCurses_API[0] = (void *)&PyCursesWindow_Type;
diff --git a/Modules/_elementtree.c b/Modules/_elementtree.c
index 2ec2332..2e10d55 100644
--- a/Modules/_elementtree.c
+++ b/Modules/_elementtree.c
@@ -248,7 +248,7 @@
 
 static PyTypeObject Element_Type;
 
-#define Element_CheckExact(op) ((op)->ob_type == &Element_Type)
+#define Element_CheckExact(op) (Py_Type(op) == &Element_Type)
 
 /* -------------------------------------------------------------------- */
 /* element constructor and destructor */
@@ -1174,7 +1174,7 @@
         /* FIXME: support arbitrary sequences? */
         PyErr_Format(
             PyExc_TypeError,
-            "expected list, not \"%.200s\"", item->ob_type->tp_name
+            "expected list, not \"%.200s\"", Py_Type(item)->tp_name
             );
         return -1;
     }
@@ -1367,8 +1367,8 @@
 };
 
 static PyTypeObject Element_Type = {
-    PyObject_HEAD_INIT(NULL)
-    0, "Element", sizeof(ElementObject), 0,
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "Element", sizeof(ElementObject), 0,
     /* methods */
     (destructor)element_dealloc, /* tp_dealloc */
     0, /* tp_print */
@@ -1407,7 +1407,7 @@
 
 static PyTypeObject TreeBuilder_Type;
 
-#define TreeBuilder_CheckExact(op) ((op)->ob_type == &TreeBuilder_Type)
+#define TreeBuilder_CheckExact(op) (Py_Type(op) == &TreeBuilder_Type)
 
 /* -------------------------------------------------------------------- */
 /* constructor and destructor */
@@ -1574,7 +1574,7 @@
         Py_INCREF(data); self->data = data;
     } else {
         /* more than one item; use a list to collect items */
-        if (PyString_CheckExact(self->data) && self->data->ob_refcnt == 1 &&
+        if (PyString_CheckExact(self->data) && Py_Refcnt(self->data) == 1 &&
             PyString_CheckExact(data) && PyString_GET_SIZE(data) == 1) {
             /* expat often generates single character data sections; handle
                the most common case by resizing the existing string... */
@@ -1780,8 +1780,8 @@
 }
 
 static PyTypeObject TreeBuilder_Type = {
-    PyObject_HEAD_INIT(NULL)
-    0, "TreeBuilder", sizeof(TreeBuilderObject), 0,
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "TreeBuilder", sizeof(TreeBuilderObject), 0,
     /* methods */
     (destructor)treebuilder_dealloc, /* tp_dealloc */
     0, /* tp_print */
@@ -2545,8 +2545,8 @@
 }
 
 static PyTypeObject XMLParser_Type = {
-    PyObject_HEAD_INIT(NULL)
-    0, "XMLParser", sizeof(XMLParserObject), 0,
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "XMLParser", sizeof(XMLParserObject), 0,
     /* methods */
     (destructor)xmlparser_dealloc, /* tp_dealloc */
     0, /* tp_print */
@@ -2580,9 +2580,9 @@
 #endif
 
     /* Patch object type */
-    Element_Type.ob_type = TreeBuilder_Type.ob_type = &PyType_Type;
+    Py_Type(&Element_Type) = Py_Type(&TreeBuilder_Type) = &PyType_Type;
 #if defined(USE_EXPAT)
-    XMLParser_Type.ob_type = &PyType_Type;
+    Py_Type(&XMLParser_Type) = &PyType_Type;
 #endif
 
     m = Py_InitModule("_elementtree", _functions);
diff --git a/Modules/_fileio.c b/Modules/_fileio.c
index f64708e..60ca8c4 100644
--- a/Modules/_fileio.c
+++ b/Modules/_fileio.c
@@ -281,7 +281,7 @@
 			Py_DECREF(closeresult);
 	}
 
-	self->ob_type->tp_free((PyObject *)self);
+	Py_Type(self)->tp_free((PyObject *)self);
 }
 
 static PyObject *
@@ -820,8 +820,7 @@
 };
 
 PyTypeObject PyFileIO_Type = {
-	PyObject_HEAD_INIT(&PyType_Type)
-	0,
+	PyVarObject_HEAD_INIT(&PyType_Type, 0)
 	"FileIO",
 	sizeof(PyFileIOObject),
 	0,
diff --git a/Modules/_functoolsmodule.c b/Modules/_functoolsmodule.c
index 1b363fc..7564c3a 100644
--- a/Modules/_functoolsmodule.c
+++ b/Modules/_functoolsmodule.c
@@ -81,7 +81,7 @@
 	Py_XDECREF(pto->args);
 	Py_XDECREF(pto->kw);
 	Py_XDECREF(pto->dict);
-	pto->ob_type->tp_free(pto);
+	Py_Type(pto)->tp_free(pto);
 }
 
 static PyObject *
@@ -197,8 +197,7 @@
 };
 
 static PyTypeObject partial_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"functools.partial",		/* tp_name */
 	sizeof(partialobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
diff --git a/Modules/_hashopenssl.c b/Modules/_hashopenssl.c
index dba1aa6..e6ac154 100644
--- a/Modules/_hashopenssl.c
+++ b/Modules/_hashopenssl.c
@@ -276,8 +276,7 @@
 digest_size -- number of bytes in this hashes output\n");
 
 static PyTypeObject EVPtype = {
-    PyObject_HEAD_INIT(NULL)
-    0,			/*ob_size*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "_hashlib.HASH",    /*tp_name*/
     sizeof(EVPobject),	/*tp_basicsize*/
     0,			/*tp_itemsize*/
@@ -459,7 +458,7 @@
      * but having some be unsupported.  Only init appropriate
      * constants. */
 
-    EVPtype.ob_type = &PyType_Type;
+    Py_Type(&EVPtype) = &PyType_Type;
     if (PyType_Ready(&EVPtype) < 0)
         return;
 
diff --git a/Modules/_hotshot.c b/Modules/_hotshot.c
index fc4a1de..dff78c7 100644
--- a/Modules/_hotshot.c
+++ b/Modules/_hotshot.c
@@ -1220,8 +1220,7 @@
 "linetimings:  True if line events collect timing information.");
 
 static PyTypeObject ProfilerType = {
-    PyObject_HEAD_INIT(NULL)
-    0,					/* ob_size		*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "_hotshot.ProfilerType",		/* tp_name		*/
     (int) sizeof(ProfilerObject),	/* tp_basicsize		*/
     0,					/* tp_itemsize		*/
@@ -1305,8 +1304,7 @@
 };
 
 static PyTypeObject LogReaderType = {
-    PyObject_HEAD_INIT(NULL)
-    0,					/* ob_size		*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "_hotshot.LogReaderType",		/* tp_name		*/
     (int) sizeof(LogReaderObject),	/* tp_basicsize		*/
     0,					/* tp_itemsize		*/
@@ -1613,8 +1611,8 @@
 {
     PyObject *module;
 
-    LogReaderType.ob_type = &PyType_Type;
-    ProfilerType.ob_type = &PyType_Type;
+    Py_Type(&LogReaderType) = &PyType_Type;
+    Py_Type(&ProfilerType) = &PyType_Type;
     module = Py_InitModule("_hotshot", functions);
     if (module != NULL) {
         char *s = get_version_string();
diff --git a/Modules/_lsprof.c b/Modules/_lsprof.c
index 6de65b7..eca7c6d 100644
--- a/Modules/_lsprof.c
+++ b/Modules/_lsprof.c
@@ -120,7 +120,7 @@
 static PyTypeObject PyProfiler_Type;
 
 #define PyProfiler_Check(op) PyObject_TypeCheck(op, &PyProfiler_Type)
-#define PyProfiler_CheckExact(op) ((op)->ob_type == &PyProfiler_Type)
+#define PyProfiler_CheckExact(op) (Py_Type(op) == &PyProfiler_Type)
 
 /*** External Timers ***/
 
@@ -210,7 +210,7 @@
 		PyObject *self = fn->m_self;
 		PyObject *name = PyString_FromString(fn->m_ml->ml_name);
 		if (name != NULL) {
-			PyObject *mo = _PyType_Lookup(self->ob_type, name);
+			PyObject *mo = _PyType_Lookup(Py_Type(self), name);
 			Py_XINCREF(mo);
 			Py_DECREF(name);
 			if (mo != NULL) {
@@ -747,7 +747,7 @@
 	flush_unmatched(op);
 	clearEntries(op);
 	Py_XDECREF(op->externalTimer);
-	op->ob_type->tp_free(op);
+	Py_Type(op)->tp_free(op);
 }
 
 static int
@@ -803,8 +803,7 @@
 ");
 
 static PyTypeObject PyProfiler_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,                                      /* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_lsprof.Profiler",                     /* tp_name */
 	sizeof(ProfilerObject),                 /* tp_basicsize */
 	0,                                      /* tp_itemsize */
diff --git a/Modules/_randommodule.c b/Modules/_randommodule.c
index 591947e..25adc2e 100644
--- a/Modules/_randommodule.c
+++ b/Modules/_randommodule.c
@@ -84,7 +84,7 @@
 
 static PyTypeObject Random_Type;
 
-#define RandomObject_Check(v)	   ((v)->ob_type == &Random_Type)
+#define RandomObject_Check(v)	   (Py_Type(v) == &Random_Type)
 
 
 /* Random methods */
@@ -404,7 +404,7 @@
 	if (!PyInt_Check(n) && !PyLong_Check(n)) {
 		PyErr_Format(PyExc_TypeError, "jumpahead requires an "
 			     "integer, not '%s'",
-			     n->ob_type->tp_name);
+			     Py_Type(n)->tp_name);
 		return NULL;
 	}
 
@@ -518,8 +518,7 @@
 "Random() -> create a random number generator with its own internal state.");
 
 static PyTypeObject Random_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_random.Random",		/*tp_name*/
 	sizeof(RandomObject),		/*tp_basicsize*/
 	0,				/*tp_itemsize*/
diff --git a/Modules/_sqlite/cache.c b/Modules/_sqlite/cache.c
index 6094eb3..829c175 100644
--- a/Modules/_sqlite/cache.c
+++ b/Modules/_sqlite/cache.c
@@ -51,7 +51,7 @@
     Py_DECREF(self->key);
     Py_DECREF(self->data);
 
-    self->ob_type->tp_free((PyObject*)self);
+    Py_Type(self)->tp_free((PyObject*)self);
 }
 
 int pysqlite_cache_init(pysqlite_Cache* self, PyObject* args, PyObject* kwargs)
@@ -109,7 +109,7 @@
     }
     Py_DECREF(self->mapping);
 
-    self->ob_type->tp_free((PyObject*)self);
+    Py_Type(self)->tp_free((PyObject*)self);
 }
 
 PyObject* pysqlite_cache_get(pysqlite_Cache* self, PyObject* args)
@@ -274,8 +274,7 @@
 };
 
 PyTypeObject pysqlite_NodeType = {
-        PyObject_HEAD_INIT(NULL)
-        0,                                              /* ob_size */
+        PyVarObject_HEAD_INIT(NULL, 0)
         MODULE_NAME "Node",                             /* tp_name */
         sizeof(pysqlite_Node),                          /* tp_basicsize */
         0,                                              /* tp_itemsize */
@@ -317,8 +316,7 @@
 };
 
 PyTypeObject pysqlite_CacheType = {
-        PyObject_HEAD_INIT(NULL)
-        0,                                              /* ob_size */
+        PyVarObject_HEAD_INIT(NULL, 0)
         MODULE_NAME ".Cache",                           /* tp_name */
         sizeof(pysqlite_Cache),                         /* tp_basicsize */
         0,                                              /* tp_itemsize */
diff --git a/Modules/_sqlite/connection.c b/Modules/_sqlite/connection.c
index 924d582..add2e6f 100644
--- a/Modules/_sqlite/connection.c
+++ b/Modules/_sqlite/connection.c
@@ -205,7 +205,7 @@
     Py_XDECREF(self->collations);
     Py_XDECREF(self->statements);
 
-    self->ob_type->tp_free((PyObject*)self);
+    Py_Type(self)->tp_free((PyObject*)self);
 }
 
 PyObject* pysqlite_connection_cursor(pysqlite_Connection* self, PyObject* args, PyObject* kwargs)
@@ -1206,8 +1206,7 @@
 };
 
 PyTypeObject pysqlite_ConnectionType = {
-        PyObject_HEAD_INIT(NULL)
-        0,                                              /* ob_size */
+        PyVarObject_HEAD_INIT(NULL, 0)
         MODULE_NAME ".Connection",                      /* tp_name */
         sizeof(pysqlite_Connection),                    /* tp_basicsize */
         0,                                              /* tp_itemsize */
diff --git a/Modules/_sqlite/cursor.c b/Modules/_sqlite/cursor.c
index 4e81307..055e544 100644
--- a/Modules/_sqlite/cursor.c
+++ b/Modules/_sqlite/cursor.c
@@ -134,7 +134,7 @@
     Py_XDECREF(self->row_factory);
     Py_XDECREF(self->next_row);
 
-    self->ob_type->tp_free((PyObject*)self);
+    Py_Type(self)->tp_free((PyObject*)self);
 }
 
 PyObject* _pysqlite_get_converter(PyObject* key)
@@ -1011,8 +1011,7 @@
 PyDoc_STR("SQLite database cursor class.");
 
 PyTypeObject pysqlite_CursorType = {
-        PyObject_HEAD_INIT(NULL)
-        0,                                              /* ob_size */
+        PyVarObject_HEAD_INIT(NULL, 0)
         MODULE_NAME ".Cursor",                          /* tp_name */
         sizeof(pysqlite_Cursor),                        /* tp_basicsize */
         0,                                              /* tp_itemsize */
diff --git a/Modules/_sqlite/prepare_protocol.c b/Modules/_sqlite/prepare_protocol.c
index a8ca518..c979610 100644
--- a/Modules/_sqlite/prepare_protocol.c
+++ b/Modules/_sqlite/prepare_protocol.c
@@ -30,12 +30,11 @@
 
 void pysqlite_prepare_protocol_dealloc(pysqlite_PrepareProtocol* self)
 {
-    self->ob_type->tp_free((PyObject*)self);
+    Py_Type(self)->tp_free((PyObject*)self);
 }
 
 PyTypeObject pysqlite_PrepareProtocolType= {
-        PyObject_HEAD_INIT(NULL)
-        0,                                              /* ob_size */
+        PyVarObject_HEAD_INIT(NULL, 0)
         MODULE_NAME ".PrepareProtocol",                 /* tp_name */
         sizeof(pysqlite_PrepareProtocol),               /* tp_basicsize */
         0,                                              /* tp_itemsize */
@@ -79,6 +78,6 @@
 extern int pysqlite_prepare_protocol_setup_types(void)
 {
     pysqlite_PrepareProtocolType.tp_new = PyType_GenericNew;
-    pysqlite_PrepareProtocolType.ob_type= &PyType_Type;
+    Py_Type(&pysqlite_PrepareProtocolType)= &PyType_Type;
     return PyType_Ready(&pysqlite_PrepareProtocolType);
 }
diff --git a/Modules/_sqlite/row.c b/Modules/_sqlite/row.c
index 7cfcfc3..9ada8a9 100644
--- a/Modules/_sqlite/row.c
+++ b/Modules/_sqlite/row.c
@@ -30,7 +30,7 @@
     Py_XDECREF(self->data);
     Py_XDECREF(self->description);
 
-    self->ob_type->tp_free((PyObject*)self);
+    Py_Type(self)->tp_free((PyObject*)self);
 }
 
 int pysqlite_row_init(pysqlite_Row* self, PyObject* args, PyObject* kwargs)
@@ -183,8 +183,7 @@
 
 
 PyTypeObject pysqlite_RowType = {
-        PyObject_HEAD_INIT(NULL)
-        0,                                              /* ob_size */
+        PyVarObject_HEAD_INIT(NULL, 0)
         MODULE_NAME ".Row",                             /* tp_name */
         sizeof(pysqlite_Row),                           /* tp_basicsize */
         0,                                              /* tp_itemsize */
diff --git a/Modules/_sqlite/statement.c b/Modules/_sqlite/statement.c
index 8a4ea6a..5987b2a 100644
--- a/Modules/_sqlite/statement.c
+++ b/Modules/_sqlite/statement.c
@@ -303,7 +303,7 @@
         PyObject_ClearWeakRefs((PyObject*)self);
     }
 
-    self->ob_type->tp_free((PyObject*)self);
+    Py_Type(self)->tp_free((PyObject*)self);
 }
 
 /*
@@ -377,8 +377,7 @@
 }
 
 PyTypeObject pysqlite_StatementType = {
-        PyObject_HEAD_INIT(NULL)
-        0,                                              /* ob_size */
+        PyVarObject_HEAD_INIT(NULL, 0)
         MODULE_NAME ".Statement",                       /* tp_name */
         sizeof(pysqlite_Statement),                     /* tp_basicsize */
         0,                                              /* tp_itemsize */
diff --git a/Modules/_sre.c b/Modules/_sre.c
index d7f608a..012f127 100644
--- a/Modules/_sre.c
+++ b/Modules/_sre.c
@@ -1685,7 +1685,7 @@
 #endif
 
     /* get pointer to string buffer */
-    buffer = string->ob_type->tp_as_buffer;
+    buffer = Py_Type(string)->tp_as_buffer;
     if (!buffer || !buffer->bf_getreadbuffer || !buffer->bf_getsegcount ||
         buffer->bf_getsegcount(string, NULL) != 1) {
         PyErr_SetString(PyExc_TypeError, "expected string or buffer");
@@ -2629,8 +2629,8 @@
 }
 
 static PyTypeObject Pattern_Type = {
-    PyObject_HEAD_INIT(NULL)
-    0, "_" SRE_MODULE ".SRE_Pattern",
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "_" SRE_MODULE ".SRE_Pattern",
     sizeof(PatternObject), sizeof(SRE_CODE),
     (destructor)pattern_dealloc, /*tp_dealloc*/
     0, /*tp_print*/
@@ -3164,8 +3164,8 @@
    detach the associated string, if any */
 
 static PyTypeObject Match_Type = {
-    PyObject_HEAD_INIT(NULL)
-    0, "_" SRE_MODULE ".SRE_Match",
+    PyVarObject_HEAD_INIT(NULL,0)
+    "_" SRE_MODULE ".SRE_Match",
     sizeof(MatchObject), sizeof(Py_ssize_t),
     (destructor)match_dealloc, /*tp_dealloc*/
     0, /*tp_print*/
@@ -3339,8 +3339,8 @@
 }
 
 static PyTypeObject Scanner_Type = {
-    PyObject_HEAD_INIT(NULL)
-    0, "_" SRE_MODULE ".SRE_Scanner",
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "_" SRE_MODULE ".SRE_Scanner",
     sizeof(ScannerObject), 0,
     (destructor)scanner_dealloc, /*tp_dealloc*/
     0, /*tp_print*/
diff --git a/Modules/_ssl.c b/Modules/_ssl.c
index f1e1092..d0f7115 100644
--- a/Modules/_ssl.c
+++ b/Modules/_ssl.c
@@ -72,7 +72,7 @@
 static int check_socket_and_wait_for_timeout(PySocketSockObject *s, 
 					     int writing);
 
-#define PySSLObject_Check(v)	((v)->ob_type == &PySSL_Type)
+#define PySSLObject_Check(v)	(Py_Type(v) == &PySSL_Type)
 
 typedef enum {
 	SOCKET_IS_NONBLOCKING,
@@ -570,8 +570,7 @@
 }
 
 static PyTypeObject PySSL_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"socket.SSL",			/*tp_name*/
 	sizeof(PySSLObject),		/*tp_basicsize*/
 	0,				/*tp_itemsize*/
@@ -632,7 +631,7 @@
     if (!PyString_Check(arg))
 	return PyErr_Format(PyExc_TypeError,
 			    "RAND_egd() expected string, found %s",
-			    arg->ob_type->tp_name);
+			    Py_Type(arg)->tp_name);
     bytes = RAND_egd(PyString_AS_STRING(arg));
     if (bytes == -1) {
 	PyErr_SetString(PySSLErrorObject,
@@ -678,7 +677,7 @@
 {
 	PyObject *m, *d;
 
-	PySSL_Type.ob_type = &PyType_Type;
+	Py_Type(&PySSL_Type) = &PyType_Type;
 
 	m = Py_InitModule3("_ssl", PySSL_methods, module_doc);
 	if (m == NULL)
diff --git a/Modules/_struct.c b/Modules/_struct.c
index 3100982..84aa828 100644
--- a/Modules/_struct.c
+++ b/Modules/_struct.c
@@ -72,7 +72,7 @@
 
 
 #define PyStruct_Check(op) PyObject_TypeCheck(op, &PyStructType)
-#define PyStruct_CheckExact(op) ((op)->ob_type == &PyStructType)
+#define PyStruct_CheckExact(op) (Py_Type(op) == &PyStructType)
 
 
 /* Exception */
@@ -131,7 +131,7 @@
 		Py_INCREF(v);
 		return v;
 	}
-	m = v->ob_type->tp_as_number;
+	m = Py_Type(v)->tp_as_number;
 	if (m != NULL && m->nb_long != NULL) {
 		v = m->nb_long(v);
 		if (v == NULL)
@@ -1490,7 +1490,7 @@
 		PyMem_FREE(s->s_codes);
 	}
 	Py_XDECREF(s->s_format);
-	s->ob_type->tp_free((PyObject *)s);
+	Py_Type(s)->tp_free((PyObject *)s);
 }
 
 static PyObject *
@@ -1839,8 +1839,7 @@
 
 static
 PyTypeObject PyStructType = {
-	PyObject_HEAD_INIT(NULL)
-	0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"Struct",
 	sizeof(PyStructObject),
 	0,
@@ -1890,7 +1889,7 @@
 	if (m == NULL)
 		return;
 
-	PyStructType.ob_type = &PyType_Type;
+	Py_Type(&PyStructType) = &PyType_Type;
 	if (PyType_Ready(&PyStructType) < 0)
 		return;
 
diff --git a/Modules/_testcapimodule.c b/Modules/_testcapimodule.c
index 3a72b40..7ed44e6 100644
--- a/Modules/_testcapimodule.c
+++ b/Modules/_testcapimodule.c
@@ -951,8 +951,7 @@
 }
 
 static PyTypeObject test_structmembersType = {
-    PyObject_HEAD_INIT(NULL)
-    0,
+    PyVarObject_HEAD_INIT(NULL, 0)
 	"test_structmembersType",
 	sizeof(test_structmembers),	/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -1002,7 +1001,7 @@
 	if (m == NULL)
 		return;
 
-	test_structmembersType.ob_type=&PyType_Type;
+	Py_Type(&test_structmembersType)=&PyType_Type;
 	Py_INCREF(&test_structmembersType);
 	PyModule_AddObject(m, "test_structmembersType", (PyObject *)&test_structmembersType);
 
diff --git a/Modules/_tkinter.c b/Modules/_tkinter.c
index deb7f1c..c8e4ef7 100644
--- a/Modules/_tkinter.c
+++ b/Modules/_tkinter.c
@@ -262,12 +262,12 @@
 	Tcl_ObjType *StringType;
 } TkappObject;
 
-#define Tkapp_Check(v) ((v)->ob_type == &Tkapp_Type)
+#define Tkapp_Check(v) (Py_Type(v) == &Tkapp_Type)
 #define Tkapp_Interp(v) (((TkappObject *) (v))->interp)
 #define Tkapp_Result(v) Tcl_GetStringResult(Tkapp_Interp(v))
 
 #define DEBUG_REFCNT(v) (printf("DEBUG: id=%p, refcnt=%i\n", \
-(void *) v, ((PyObject *) v)->ob_refcnt))
+(void *) v, Py_Refcnt(v)))
 
 
 
@@ -828,8 +828,7 @@
 };
 
 static PyTypeObject PyTclObject_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,			/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_tkinter.Tcl_Obj",		/*tp_name*/
 	sizeof(PyTclObject),	/*tp_basicsize*/
 	0,			/*tp_itemsize*/
@@ -2371,8 +2370,7 @@
 
 static PyTypeObject Tktt_Type =
 {
-	PyObject_HEAD_INIT(NULL)
-	0,				     /*ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"tktimertoken",			     /*tp_name */
 	sizeof(TkttObject),		     /*tp_basicsize */
 	0,				     /*tp_itemsize */
@@ -2716,8 +2714,7 @@
 
 static PyTypeObject Tkapp_Type =
 {
-	PyObject_HEAD_INIT(NULL)
-	0,				     /*ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"tkapp",			     /*tp_name */
 	sizeof(TkappObject),		     /*tp_basicsize */
 	0,				     /*tp_itemsize */
@@ -3056,7 +3053,7 @@
 {
 	PyObject *m, *d;
 
-	Tkapp_Type.ob_type = &PyType_Type;
+	Py_Type(&Tkapp_Type) = &PyType_Type;
 
 #ifdef WITH_THREAD
 	tcl_lock = PyThread_allocate_lock();
@@ -3084,10 +3081,10 @@
 
 	PyDict_SetItemString(d, "TkappType", (PyObject *)&Tkapp_Type);
 
-	Tktt_Type.ob_type = &PyType_Type;
+	Py_Type(&Tktt_Type) = &PyType_Type;
 	PyDict_SetItemString(d, "TkttType", (PyObject *)&Tktt_Type);
 
-	PyTclObject_Type.ob_type = &PyType_Type;
+	Py_Type(&PyTclObject_Type) = &PyType_Type;
 	PyDict_SetItemString(d, "Tcl_Obj", (PyObject *)&PyTclObject_Type);
 
 #ifdef TK_AQUA
diff --git a/Modules/_typesmodule.c b/Modules/_typesmodule.c
index 5a6f2b9..e925664 100644
--- a/Modules/_typesmodule.c
+++ b/Modules/_typesmodule.c
@@ -33,8 +33,7 @@
 };
 
 static PyTypeObject HelperType = {
-    PyObject_HEAD_INIT(NULL)
-    0,						/* ob_size */
+    PyVarObject_HEAD_INIT(NULL, 0)
     "_types.Helper",				/* tp_name */
     sizeof(Helper),                             /* tp_basicsize */
     0,						/* tp_itemsize */
diff --git a/Modules/_weakref.c b/Modules/_weakref.c
index 1712f12..cb7977b 100644
--- a/Modules/_weakref.c
+++ b/Modules/_weakref.c
@@ -14,7 +14,7 @@
 {
     PyObject *result = NULL;
 
-    if (PyType_SUPPORTS_WEAKREFS(object->ob_type)) {
+    if (PyType_SUPPORTS_WEAKREFS(Py_Type(object))) {
         PyWeakReference **list = GET_WEAKREFS_LISTPTR(object);
 
         result = PyInt_FromSsize_t(_PyWeakref_GetWeakrefCount(*list));
@@ -35,7 +35,7 @@
 {
     PyObject *result = NULL;
 
-    if (PyType_SUPPORTS_WEAKREFS(object->ob_type)) {
+    if (PyType_SUPPORTS_WEAKREFS(Py_Type(object))) {
         PyWeakReference **list = GET_WEAKREFS_LISTPTR(object);
         Py_ssize_t count = _PyWeakref_GetWeakrefCount(*list);
 
diff --git a/Modules/arraymodule.c b/Modules/arraymodule.c
index 7ddc7e8..89e3f25 100644
--- a/Modules/arraymodule.c
+++ b/Modules/arraymodule.c
@@ -39,7 +39,7 @@
 static PyTypeObject Arraytype;
 
 #define array_Check(op) PyObject_TypeCheck(op, &Arraytype)
-#define array_CheckExact(op) ((op)->ob_type == &Arraytype)
+#define array_CheckExact(op) (Py_Type(op) == &Arraytype)
 
 static int
 array_resize(arrayobject *self, Py_ssize_t newsize)
@@ -53,9 +53,9 @@
 	*/
 
 	if (self->allocated >= newsize &&
-	    self->ob_size < newsize + 16 &&
+	    Py_Size(self) < newsize + 16 &&
 	    self->ob_item != NULL) {
-		self->ob_size = newsize;
+		Py_Size(self) = newsize;
 		return 0;
 	}
 
@@ -71,7 +71,7 @@
 	 * memory critical.
 	 */
 
-	_new_size = (newsize >> 4) + (self->ob_size < 8 ? 3 : 7) + newsize;
+	_new_size = (newsize >> 4) + (Py_Size(self) < 8 ? 3 : 7) + newsize;
 	items = self->ob_item;
 	/* XXX The following multiplication and division does not optimize away 
 	   like it does for lists since the size is not known at compile time */
@@ -84,7 +84,7 @@
 		return -1;
 	}
 	self->ob_item = items;
-	self->ob_size = newsize;
+	Py_Size(self) = newsize;
 	self->allocated = _new_size;
 	return 0;
 }
@@ -410,7 +410,7 @@
 	if (op == NULL) {
 		return NULL;
 	}
-	op->ob_size = size;
+	Py_Size(op) = size;
 	if (size <= 0) {
 		op->ob_item = NULL;
 	}
@@ -433,7 +433,7 @@
 	register arrayobject *ap;
 	assert(array_Check(op));
 	ap = (arrayobject *)op;
-	assert(i>=0 && i<ap->ob_size);
+	assert(i>=0 && i<Py_Size(ap));
 	return (*ap->ob_descr->getitem)(ap, i);
 }
 
@@ -441,7 +441,7 @@
 ins1(arrayobject *self, Py_ssize_t where, PyObject *v)
 {
 	char *items;
-	Py_ssize_t n = self->ob_size;
+	Py_ssize_t n = Py_Size(self);
 	if (v == NULL) {
 		PyErr_BadInternalCall();
 		return -1;
@@ -476,7 +476,7 @@
 		PyObject_ClearWeakRefs((PyObject *) op);
 	if (op->ob_item != NULL)
 		PyMem_DEL(op->ob_item);
-	op->ob_type->tp_free((PyObject *)op);
+	Py_Type(op)->tp_free((PyObject *)op);
 }
 
 static PyObject *
@@ -496,7 +496,7 @@
 	va = (arrayobject *)v;
 	wa = (arrayobject *)w;
 
-	if (va->ob_size != wa->ob_size && (op == Py_EQ || op == Py_NE)) {
+	if (Py_Size(va) != Py_Size(wa) && (op == Py_EQ || op == Py_NE)) {
 		/* Shortcut: if the lengths differ, the arrays differ */
 		if (op == Py_EQ)
 			res = Py_False;
@@ -508,7 +508,7 @@
 
 	/* Search for the first index where items are different */
 	k = 1;
-	for (i = 0; i < va->ob_size && i < wa->ob_size; i++) {
+	for (i = 0; i < Py_Size(va) && i < Py_Size(wa); i++) {
 		vi = getarrayitem(v, i);
 		wi = getarrayitem(w, i);
 		if (vi == NULL || wi == NULL) {
@@ -527,8 +527,8 @@
 
 	if (k) {
 		/* No more items to compare -- compare sizes */
-		Py_ssize_t vs = va->ob_size;
-		Py_ssize_t ws = wa->ob_size;
+		Py_ssize_t vs = Py_Size(va);
+		Py_ssize_t ws = Py_Size(wa);
 		int cmp;
 		switch (op) {
 		case Py_LT: cmp = vs <  ws; break;
@@ -568,13 +568,13 @@
 static Py_ssize_t
 array_length(arrayobject *a)
 {
-	return a->ob_size;
+	return Py_Size(a);
 }
 
 static PyObject *
 array_item(arrayobject *a, Py_ssize_t i)
 {
-	if (i < 0 || i >= a->ob_size) {
+	if (i < 0 || i >= Py_Size(a)) {
 		PyErr_SetString(PyExc_IndexError, "array index out of range");
 		return NULL;
 	}
@@ -587,14 +587,14 @@
 	arrayobject *np;
 	if (ilow < 0)
 		ilow = 0;
-	else if (ilow > a->ob_size)
-		ilow = a->ob_size;
+	else if (ilow > Py_Size(a))
+		ilow = Py_Size(a);
 	if (ihigh < 0)
 		ihigh = 0;
 	if (ihigh < ilow)
 		ihigh = ilow;
-	else if (ihigh > a->ob_size)
-		ihigh = a->ob_size;
+	else if (ihigh > Py_Size(a))
+		ihigh = Py_Size(a);
 	np = (arrayobject *) newarrayobject(&Arraytype, ihigh - ilow, a->ob_descr);
 	if (np == NULL)
 		return NULL;
@@ -606,7 +606,7 @@
 static PyObject *
 array_copy(arrayobject *a, PyObject *unused)
 {
-	return array_slice(a, 0, a->ob_size);
+	return array_slice(a, 0, Py_Size(a));
 }
 
 PyDoc_STRVAR(copy_doc,
@@ -622,7 +622,7 @@
 	if (!array_Check(bb)) {
 		PyErr_Format(PyExc_TypeError,
 		     "can only append array (not \"%.200s\") to array",
-			     bb->ob_type->tp_name);
+			     Py_Type(bb)->tp_name);
 		return NULL;
 	}
 #define b ((arrayobject *)bb)
@@ -630,14 +630,14 @@
 		PyErr_BadArgument();
 		return NULL;
 	}
-	size = a->ob_size + b->ob_size;
+	size = Py_Size(a) + Py_Size(b);
 	np = (arrayobject *) newarrayobject(&Arraytype, size, a->ob_descr);
 	if (np == NULL) {
 		return NULL;
 	}
-	memcpy(np->ob_item, a->ob_item, a->ob_size*a->ob_descr->itemsize);
-	memcpy(np->ob_item + a->ob_size*a->ob_descr->itemsize,
-	       b->ob_item, b->ob_size*b->ob_descr->itemsize);
+	memcpy(np->ob_item, a->ob_item, Py_Size(a)*a->ob_descr->itemsize);
+	memcpy(np->ob_item + Py_Size(a)*a->ob_descr->itemsize,
+	       b->ob_item, Py_Size(b)*b->ob_descr->itemsize);
 	return (PyObject *)np;
 #undef b
 }
@@ -652,12 +652,12 @@
 	Py_ssize_t nbytes;
 	if (n < 0)
 		n = 0;
-	size = a->ob_size * n;
+	size = Py_Size(a) * n;
 	np = (arrayobject *) newarrayobject(&Arraytype, size, a->ob_descr);
 	if (np == NULL)
 		return NULL;
 	p = np->ob_item;
-	nbytes = a->ob_size * a->ob_descr->itemsize;
+	nbytes = Py_Size(a) * a->ob_descr->itemsize;
 	for (i = 0; i < n; i++) {
 		memcpy(p, a->ob_item, nbytes);
 		p += nbytes;
@@ -675,7 +675,7 @@
 	if (v == NULL)
 		n = 0;
 	else if (array_Check(v)) {
-		n = b->ob_size;
+		n = Py_Size(b);
 		if (a == b) {
 			/* Special case "a[i:j] = a" -- copy b first */
 			int ret;
@@ -694,44 +694,44 @@
 	else {
 		PyErr_Format(PyExc_TypeError,
 	     "can only assign array (not \"%.200s\") to array slice",
-			     v->ob_type->tp_name);
+			     Py_Type(v)->tp_name);
 		return -1;
 	}
 	if (ilow < 0)
 		ilow = 0;
-	else if (ilow > a->ob_size)
-		ilow = a->ob_size;
+	else if (ilow > Py_Size(a))
+		ilow = Py_Size(a);
 	if (ihigh < 0)
 		ihigh = 0;
 	if (ihigh < ilow)
 		ihigh = ilow;
-	else if (ihigh > a->ob_size)
-		ihigh = a->ob_size;
+	else if (ihigh > Py_Size(a))
+		ihigh = Py_Size(a);
 	item = a->ob_item;
 	d = n - (ihigh-ilow);
 	if (d < 0) { /* Delete -d items */
 		memmove(item + (ihigh+d)*a->ob_descr->itemsize,
 			item + ihigh*a->ob_descr->itemsize,
-			(a->ob_size-ihigh)*a->ob_descr->itemsize);
-		a->ob_size += d;
-		PyMem_RESIZE(item, char, a->ob_size*a->ob_descr->itemsize);
+			(Py_Size(a)-ihigh)*a->ob_descr->itemsize);
+		Py_Size(a) += d;
+		PyMem_RESIZE(item, char, Py_Size(a)*a->ob_descr->itemsize);
 						/* Can't fail */
 		a->ob_item = item;
-		a->allocated = a->ob_size;
+		a->allocated = Py_Size(a);
 	}
 	else if (d > 0) { /* Insert d items */
 		PyMem_RESIZE(item, char,
-			     (a->ob_size + d)*a->ob_descr->itemsize);
+			     (Py_Size(a) + d)*a->ob_descr->itemsize);
 		if (item == NULL) {
 			PyErr_NoMemory();
 			return -1;
 		}
 		memmove(item + (ihigh+d)*a->ob_descr->itemsize,
 			item + ihigh*a->ob_descr->itemsize,
-			(a->ob_size-ihigh)*a->ob_descr->itemsize);
+			(Py_Size(a)-ihigh)*a->ob_descr->itemsize);
 		a->ob_item = item;
-		a->ob_size += d;
-		a->allocated = a->ob_size;
+		Py_Size(a) += d;
+		a->allocated = Py_Size(a);
 	}
 	if (n > 0)
 		memcpy(item + ilow*a->ob_descr->itemsize, b->ob_item,
@@ -743,7 +743,7 @@
 static int
 array_ass_item(arrayobject *a, Py_ssize_t i, PyObject *v)
 {
-	if (i < 0 || i >= a->ob_size) {
+	if (i < 0 || i >= Py_Size(a)) {
 		PyErr_SetString(PyExc_IndexError,
 			         "array assignment index out of range");
 		return -1;
@@ -770,7 +770,7 @@
 		return -1;
 
 	while ((v = PyIter_Next(it)) != NULL) {
-		if (ins1(self, (int) self->ob_size, v) != 0) {
+		if (ins1(self, (int) Py_Size(self), v) != 0) {
 			Py_DECREF(v);
 			Py_DECREF(it);
 			return -1;
@@ -796,16 +796,16 @@
 			     "can only extend with array of same kind");
 		return -1;
 	}
-	size = self->ob_size + b->ob_size;
+	size = Py_Size(self) + Py_Size(b);
         PyMem_RESIZE(self->ob_item, char, size*self->ob_descr->itemsize);
         if (self->ob_item == NULL) {
                 PyObject_Del(self);
                 PyErr_NoMemory();
 		return -1;
         }
-	memcpy(self->ob_item + self->ob_size*self->ob_descr->itemsize,
-               b->ob_item, b->ob_size*b->ob_descr->itemsize);
-	self->ob_size = size;
+	memcpy(self->ob_item + Py_Size(self)*self->ob_descr->itemsize,
+               b->ob_item, Py_Size(b)*b->ob_descr->itemsize);
+	Py_Size(self) = size;
 	self->allocated = size;
 
 	return 0;
@@ -818,7 +818,7 @@
 	if (!array_Check(bb)) {
 		PyErr_Format(PyExc_TypeError,
 			"can only extend array with array (not \"%.200s\")",
-			bb->ob_type->tp_name);
+			Py_Type(bb)->tp_name);
 		return NULL;
 	}
 	if (array_do_extend(self, bb) == -1)
@@ -833,15 +833,15 @@
 	char *items, *p;
 	Py_ssize_t size, i;
 
-	if (self->ob_size > 0) {
+	if (Py_Size(self) > 0) {
 		if (n < 0)
 			n = 0;
 		items = self->ob_item;
-		size = self->ob_size * self->ob_descr->itemsize;
+		size = Py_Size(self) * self->ob_descr->itemsize;
 		if (n == 0) {
 			PyMem_FREE(items);
 			self->ob_item = NULL;
-			self->ob_size = 0;
+			Py_Size(self) = 0;
 			self->allocated = 0;
 		}
 		else {
@@ -854,8 +854,8 @@
 				memcpy(p, items, size);
 			}
 			self->ob_item = items;
-			self->ob_size *= n;
-			self->allocated = self->ob_size;
+			Py_Size(self) *= n;
+			self->allocated = Py_Size(self);
 		}
 	}
 	Py_INCREF(self);
@@ -878,7 +878,7 @@
 	Py_ssize_t count = 0;
 	Py_ssize_t i;
 
-	for (i = 0; i < self->ob_size; i++) {
+	for (i = 0; i < Py_Size(self); i++) {
 		PyObject *selfi = getarrayitem((PyObject *)self, i);
 		int cmp = PyObject_RichCompareBool(selfi, v, Py_EQ);
 		Py_DECREF(selfi);
@@ -900,7 +900,7 @@
 {
 	Py_ssize_t i;
 
-	for (i = 0; i < self->ob_size; i++) {
+	for (i = 0; i < Py_Size(self); i++) {
 		PyObject *selfi = getarrayitem((PyObject *)self, i);
 		int cmp = PyObject_RichCompareBool(selfi, v, Py_EQ);
 		Py_DECREF(selfi);
@@ -925,7 +925,7 @@
 	Py_ssize_t i;
 	int cmp;
 
-	for (i = 0, cmp = 0 ; cmp == 0 && i < self->ob_size; i++) {
+	for (i = 0, cmp = 0 ; cmp == 0 && i < Py_Size(self); i++) {
 		PyObject *selfi = getarrayitem((PyObject *)self, i);
 		cmp = PyObject_RichCompareBool(selfi, v, Py_EQ);
 		Py_DECREF(selfi);
@@ -938,7 +938,7 @@
 {
 	int i;
 
-	for (i = 0; i < self->ob_size; i++) {
+	for (i = 0; i < Py_Size(self); i++) {
 		PyObject *selfi = getarrayitem((PyObject *)self,i);
 		int cmp = PyObject_RichCompareBool(selfi, v, Py_EQ);
 		Py_DECREF(selfi);
@@ -968,14 +968,14 @@
 	PyObject *v;
 	if (!PyArg_ParseTuple(args, "|n:pop", &i))
 		return NULL;
-	if (self->ob_size == 0) {
+	if (Py_Size(self) == 0) {
 		/* Special-case most common failure cause */
 		PyErr_SetString(PyExc_IndexError, "pop from empty array");
 		return NULL;
 	}
 	if (i < 0)
-		i += self->ob_size;
-	if (i < 0 || i >= self->ob_size) {
+		i += Py_Size(self);
+	if (i < 0 || i >= Py_Size(self)) {
 		PyErr_SetString(PyExc_IndexError, "pop index out of range");
 		return NULL;
 	}
@@ -1031,7 +1031,7 @@
 		return NULL;
 
 	PyTuple_SET_ITEM(retval, 0, PyLong_FromVoidPtr(self->ob_item));
-	PyTuple_SET_ITEM(retval, 1, PyInt_FromLong((long)(self->ob_size)));
+	PyTuple_SET_ITEM(retval, 1, PyInt_FromLong((long)(Py_Size(self))));
 
 	return retval;
 }
@@ -1048,7 +1048,7 @@
 static PyObject *
 array_append(arrayobject *self, PyObject *v)
 {
-	return ins(self, (int) self->ob_size, v);
+	return ins(self, (int) Py_Size(self), v);
 }
 
 PyDoc_STRVAR(append_doc,
@@ -1067,14 +1067,14 @@
 	case 1:
 		break;
 	case 2:
-		for (p = self->ob_item, i = self->ob_size; --i >= 0; p += 2) {
+		for (p = self->ob_item, i = Py_Size(self); --i >= 0; p += 2) {
 			char p0 = p[0];
 			p[0] = p[1];
 			p[1] = p0;
 		}
 		break;
 	case 4:
-		for (p = self->ob_item, i = self->ob_size; --i >= 0; p += 4) {
+		for (p = self->ob_item, i = Py_Size(self); --i >= 0; p += 4) {
 			char p0 = p[0];
 			char p1 = p[1];
 			p[0] = p[3];
@@ -1084,7 +1084,7 @@
 		}
 		break;
 	case 8:
-		for (p = self->ob_item, i = self->ob_size; --i >= 0; p += 8) {
+		for (p = self->ob_item, i = Py_Size(self); --i >= 0; p += 8) {
 			char p0 = p[0];
 			char p1 = p[1];
 			char p2 = p[2];
@@ -1125,16 +1125,16 @@
 		dict = Py_None;
 		Py_INCREF(dict);
 	}
-	if (array->ob_size > 0) {
+	if (Py_Size(array) > 0) {
 		result = Py_BuildValue("O(cy#)O", 
-			array->ob_type, 
+			Py_Type(array), 
 			array->ob_descr->typecode,
 			array->ob_item,
-			array->ob_size * array->ob_descr->itemsize,
+			Py_Size(array) * array->ob_descr->itemsize,
 			dict);
 	} else {
 		result = Py_BuildValue("O(c)O", 
-			array->ob_type, 
+			Py_Type(array), 
 			array->ob_descr->typecode,
 			dict);
 	}
@@ -1153,9 +1153,9 @@
 	char tmp[256];	/* 8 is probably enough -- but why skimp */
 	assert((size_t)itemsize <= sizeof(tmp));
 
-	if (self->ob_size > 1) {
+	if (Py_Size(self) > 1) {
 		for (p = self->ob_item,
-		     q = self->ob_item + (self->ob_size - 1)*itemsize;
+		     q = self->ob_item + (Py_Size(self) - 1)*itemsize;
 		     p < q;
 		     p += itemsize, q -= itemsize) {
 			/* memory areas guaranteed disjoint, so memcpy
@@ -1242,7 +1242,7 @@
 	Py_ssize_t nblocks = (nbytes + BLOCKSIZE - 1) / BLOCKSIZE;
 	Py_ssize_t i;
 
-        if (self->ob_size == 0)
+        if (Py_Size(self) == 0)
 		goto done;
 
 	for (i = 0; i < nblocks; i++) {
@@ -1286,23 +1286,23 @@
 	if (n > 0) {
 		char *item = self->ob_item;
 		Py_ssize_t i;
-		PyMem_RESIZE(item, char, (self->ob_size + n) * itemsize);
+		PyMem_RESIZE(item, char, (Py_Size(self) + n) * itemsize);
 		if (item == NULL) {
 			PyErr_NoMemory();
 			return NULL;
 		}
 		self->ob_item = item;
-		self->ob_size += n;
-		self->allocated = self->ob_size;
+		Py_Size(self) += n;
+		self->allocated = Py_Size(self);
 		for (i = 0; i < n; i++) {
 			PyObject *v = PyList_GetItem(list, i);
 			if ((*self->ob_descr->setitem)(self,
-					self->ob_size - n + i, v) != 0) {
-				self->ob_size -= n;
+					Py_Size(self) - n + i, v) != 0) {
+				Py_Size(self) -= n;
 				PyMem_RESIZE(item, char,
-					          self->ob_size * itemsize);
+					          Py_Size(self) * itemsize);
 				self->ob_item = item;
-				self->allocated = self->ob_size;
+				self->allocated = Py_Size(self);
 				return NULL;
 			}
 		}
@@ -1319,12 +1319,12 @@
 static PyObject *
 array_tolist(arrayobject *self, PyObject *unused)
 {
-	PyObject *list = PyList_New(self->ob_size);
+	PyObject *list = PyList_New(Py_Size(self));
 	Py_ssize_t i;
 
 	if (list == NULL)
 		return NULL;
-	for (i = 0; i < self->ob_size; i++) {
+	for (i = 0; i < Py_Size(self); i++) {
 		PyObject *v = getarrayitem((PyObject *)self, i);
 		if (v == NULL) {
 			Py_DECREF(list);
@@ -1357,15 +1357,15 @@
 	n = n / itemsize;
 	if (n > 0) {
 		char *item = self->ob_item;
-		PyMem_RESIZE(item, char, (self->ob_size + n) * itemsize);
+		PyMem_RESIZE(item, char, (Py_Size(self) + n) * itemsize);
 		if (item == NULL) {
 			PyErr_NoMemory();
 			return NULL;
 		}
 		self->ob_item = item;
-		self->ob_size += n;
-		self->allocated = self->ob_size;
-		memcpy(item + (self->ob_size - n) * itemsize,
+		Py_Size(self) += n;
+		self->allocated = Py_Size(self);
+		memcpy(item + (Py_Size(self) - n) * itemsize,
 		       str, itemsize*n);
 	}
 	Py_INCREF(Py_None);
@@ -1410,15 +1410,15 @@
 	}
 	if (n > 0) {
 		Py_UNICODE *item = (Py_UNICODE *) self->ob_item;
-		PyMem_RESIZE(item, Py_UNICODE, self->ob_size + n);
+		PyMem_RESIZE(item, Py_UNICODE, Py_Size(self) + n);
 		if (item == NULL) {
 			PyErr_NoMemory();
 			return NULL;
 		}
 		self->ob_item = (char *) item;
-		self->ob_size += n;
-		self->allocated = self->ob_size;
-		memcpy(item + self->ob_size - n,
+		Py_Size(self) += n;
+		self->allocated = Py_Size(self);
+		memcpy(item + Py_Size(self) - n,
 		       ustr, n * sizeof(Py_UNICODE));
 	}
 
@@ -1443,7 +1443,7 @@
 			"tounicode() may only be called on type 'u' arrays");
 		return NULL;
 	}
-	return PyUnicode_FromUnicode((Py_UNICODE *) self->ob_item, self->ob_size);
+	return PyUnicode_FromUnicode((Py_UNICODE *) self->ob_item, Py_Size(self));
 }
 
 PyDoc_STRVAR(tounicode_doc,
@@ -1536,7 +1536,7 @@
 	PyObject *s, *v = NULL;
 	Py_ssize_t len;
 
-	len = a->ob_size;
+	len = Py_Size(a);
 	typecode = a->ob_descr->typecode;
 	if (len == 0) {
 		return PyUnicode_FromFormat("array('%c')", typecode);
@@ -1560,7 +1560,7 @@
 			return NULL;
 		}
 		if (i < 0)
-			i += self->ob_size;
+			i += Py_Size(self);
 		return array_item(self, i);
 	}
 	else if (PySlice_Check(item)) {
@@ -1569,7 +1569,7 @@
 		arrayobject* ar;
 		int itemsize = self->ob_descr->itemsize;
 
-		if (PySlice_GetIndicesEx((PySliceObject*)item, self->ob_size,
+		if (PySlice_GetIndicesEx((PySliceObject*)item, Py_Size(self),
 				 &start, &stop, &step, &slicelength) < 0) {
 			return NULL;
 		}
@@ -1608,14 +1608,14 @@
 		if (i==-1 && PyErr_Occurred()) 
 			return -1;
 		if (i < 0)
-			i += self->ob_size;
+			i += Py_Size(self);
 		return array_ass_item(self, i, value);
 	}
 	else if (PySlice_Check(item)) {
 		Py_ssize_t start, stop, step, slicelength;
 		int itemsize = self->ob_descr->itemsize;
 
-		if (PySlice_GetIndicesEx((PySliceObject*)item, self->ob_size,
+		if (PySlice_GetIndicesEx((PySliceObject*)item, Py_Size(self),
 				 &start, &stop, &step, &slicelength) < 0) {
 			return -1;
 		}
@@ -1643,17 +1643,17 @@
 					self->ob_item + (cur + 1)*itemsize,
 					(step - 1) * itemsize);
 			}
-			extra = self->ob_size - (cur + 1);
+			extra = Py_Size(self) - (cur + 1);
 			if (extra > 0) {
 				memmove(self->ob_item + (cur - i)*itemsize,
 					self->ob_item + (cur + 1)*itemsize,
 					extra*itemsize);
 			}
 
-			self->ob_size -= slicelength;
+			Py_Size(self) -= slicelength;
 			self->ob_item = (char *)PyMem_REALLOC(self->ob_item,
-							      itemsize*self->ob_size);
-			self->allocated = self->ob_size;
+							      itemsize*Py_Size(self));
+			self->allocated = Py_Size(self);
 
 			return 0;
 		}
@@ -1665,16 +1665,16 @@
 			if (!array_Check(value)) {
 				PyErr_Format(PyExc_TypeError,
 			     "must assign array (not \"%.200s\") to slice",
-					     value->ob_type->tp_name);
+					     Py_Type(value)->tp_name);
 				return -1;
 			}
 
 			av = (arrayobject*)value;
 
-			if (av->ob_size != slicelength) {
+			if (Py_Size(av) != slicelength) {
 				PyErr_Format(PyExc_ValueError,
             "attempt to assign array of size %ld to extended slice of size %ld",
-					     /*XXX*/(long)av->ob_size, /*XXX*/(long)slicelength);
+					     /*XXX*/(long)Py_Size(av), /*XXX*/(long)slicelength);
 				return -1;
 			}
 
@@ -1683,7 +1683,7 @@
 
 			/* protect against a[::-1] = a */
 			if (self == av) { 
-				value = array_slice(av, 0, av->ob_size);
+				value = array_slice(av, 0, Py_Size(av));
 				av = (arrayobject*)value;
 				if (!av)
 					return -1;
@@ -1730,7 +1730,7 @@
 	*ptr = (void *)self->ob_item;
 	if (*ptr == NULL)
 		*ptr = emptybuf;
-	return self->ob_size*self->ob_descr->itemsize;
+	return Py_Size(self)*self->ob_descr->itemsize;
 }
 
 static Py_ssize_t
@@ -1744,14 +1744,14 @@
 	*ptr = (void *)self->ob_item;
 	if (*ptr == NULL)
 		*ptr = emptybuf;
-	return self->ob_size*self->ob_descr->itemsize;
+	return Py_Size(self)*self->ob_descr->itemsize;
 }
 
 static Py_ssize_t
 array_buffer_getsegcount(arrayobject *self, Py_ssize_t *lenp)
 {
 	if ( lenp )
-		*lenp = self->ob_size*self->ob_descr->itemsize;
+		*lenp = Py_Size(self)*self->ob_descr->itemsize;
 	return 1;
 }
 
@@ -1861,9 +1861,9 @@
 						return NULL;
 					}
 					self->ob_item = item;
-					self->ob_size = n / sizeof(Py_UNICODE);
+					Py_Size(self) = n / sizeof(Py_UNICODE);
 					memcpy(item, PyUnicode_AS_DATA(initial), n);
-					self->allocated = self->ob_size;
+					self->allocated = Py_Size(self);
 				}
 			}
 			if (it != NULL) {
@@ -1949,8 +1949,7 @@
 static PyObject *array_iter(arrayobject *ao);
 
 static PyTypeObject Arraytype = {
-	PyObject_HEAD_INIT(NULL)
-	0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"array.array",
 	sizeof(arrayobject),
 	0,
@@ -2031,7 +2030,7 @@
 arrayiter_next(arrayiterobject *it)
 {
 	assert(PyArrayIter_Check(it));
-	if (it->index < it->ao->ob_size)
+	if (it->index < Py_Size(it->ao))
 		return (*it->getitem)(it->ao, it->index++);
 	return NULL;
 }
@@ -2052,8 +2051,7 @@
 }
 
 static PyTypeObject PyArrayIter_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,                                      /* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"arrayiterator",                        /* tp_name */
 	sizeof(arrayiterobject),                /* tp_basicsize */
 	0,                                      /* tp_itemsize */
@@ -2100,7 +2098,7 @@
 
 	if (PyType_Ready(&Arraytype) < 0)
             return;
-	PyArrayIter_Type.ob_type = &PyType_Type;
+	Py_Type(&PyArrayIter_Type) = &PyType_Type;
 	m = Py_InitModule3("array", a_methods, module_doc);
 	if (m == NULL)
 		return;
diff --git a/Modules/bz2module.c b/Modules/bz2module.c
index 17cad42..43c287b 100644
--- a/Modules/bz2module.c
+++ b/Modules/bz2module.c
@@ -41,7 +41,7 @@
 #define MODE_READ_EOF 2
 #define MODE_WRITE    3
 
-#define BZ2FileObject_Check(v)	((v)->ob_type == &BZ2File_Type)
+#define BZ2FileObject_Check(v)	(Py_Type(v) == &BZ2File_Type)
 
 
 #ifdef BZ_CONFIG_ERROR
@@ -1245,7 +1245,7 @@
 	Util_DropReadAhead(self);
 	if (self->rawfp != NULL)
 		fclose(self->rawfp);
-	self->ob_type->tp_free((PyObject *)self);
+	Py_Type(self)->tp_free((PyObject *)self);
 }
 
 /* This is a hacked version of Python's fileobject.c:file_getiter(). */
@@ -1298,8 +1298,7 @@
 ");
 
 static PyTypeObject BZ2File_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,			/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"bz2.BZ2File",		/*tp_name*/
 	sizeof(BZ2FileObject),	/*tp_basicsize*/
 	0,			/*tp_itemsize*/
@@ -1558,7 +1557,7 @@
 		PyThread_free_lock(self->lock);
 #endif
 	BZ2_bzCompressEnd(&self->bzs);
-	self->ob_type->tp_free((PyObject *)self);
+	Py_Type(self)->tp_free((PyObject *)self);
 }
 
 
@@ -1575,8 +1574,7 @@
 ");
 
 static PyTypeObject BZ2Comp_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,			/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"bz2.BZ2Compressor",	/*tp_name*/
 	sizeof(BZ2CompObject),	/*tp_basicsize*/
 	0,			/*tp_itemsize*/
@@ -1784,7 +1782,7 @@
 #endif
 	Py_XDECREF(self->unused_data);
 	BZ2_bzDecompressEnd(&self->bzs);
-	self->ob_type->tp_free((PyObject *)self);
+	Py_Type(self)->tp_free((PyObject *)self);
 }
 
 
@@ -1800,8 +1798,7 @@
 ");
 
 static PyTypeObject BZ2Decomp_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,			/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"bz2.BZ2Decompressor",	/*tp_name*/
 	sizeof(BZ2DecompObject), /*tp_basicsize*/
 	0,			/*tp_itemsize*/
@@ -2043,9 +2040,9 @@
 {
 	PyObject *m;
 
-	BZ2File_Type.ob_type = &PyType_Type;
-	BZ2Comp_Type.ob_type = &PyType_Type;
-	BZ2Decomp_Type.ob_type = &PyType_Type;
+	Py_Type(&BZ2File_Type) = &PyType_Type;
+	Py_Type(&BZ2Comp_Type) = &PyType_Type;
+	Py_Type(&BZ2Decomp_Type) = &PyType_Type;
 
 	m = Py_InitModule3("bz2", bz2_methods, bz2__doc__);
 	if (m == NULL)
diff --git a/Modules/cStringIO.c b/Modules/cStringIO.c
index 42f2de2..16d4173 100644
--- a/Modules/cStringIO.c
+++ b/Modules/cStringIO.c
@@ -506,8 +506,7 @@
 PyDoc_STRVAR(Otype__doc__, "Simple type for output to strings.");
 
 static PyTypeObject Otype = {
-  PyObject_HEAD_INIT(NULL)
-  0,	       			/*ob_size*/
+  PyVarObject_HEAD_INIT(NULL, 0)
   "cStringIO.StringO",   	/*tp_name*/
   sizeof(Oobject),       	/*tp_basicsize*/
   0,	       			/*tp_itemsize*/
@@ -626,8 +625,7 @@
 "Simple type for treating strings as input file streams");
 
 static PyTypeObject Itype = {
-  PyObject_HEAD_INIT(NULL)
-  0,					/*ob_size*/
+  PyVarObject_HEAD_INIT(NULL, 0)
   "cStringIO.StringI",			/*tp_name*/
   sizeof(Iobject),			/*tp_basicsize*/
   0,					/*tp_itemsize*/
@@ -737,8 +735,8 @@
   d = PyModule_GetDict(m);
   
   /* Export C API */
-  Itype.ob_type=&PyType_Type;
-  Otype.ob_type=&PyType_Type;
+  Py_Type(&Itype)=&PyType_Type;
+  Py_Type(&Otype)=&PyType_Type;
   if (PyType_Ready(&Otype) < 0) return;
   if (PyType_Ready(&Itype) < 0) return;
   PyDict_SetItemString(d,"cStringIO_CAPI",
diff --git a/Modules/cjkcodecs/multibytecodec.c b/Modules/cjkcodecs/multibytecodec.c
index 933aa1b..7d14437 100644
--- a/Modules/cjkcodecs/multibytecodec.c
+++ b/Modules/cjkcodecs/multibytecodec.c
@@ -676,8 +676,7 @@
 }
 
 static PyTypeObject MultibyteCodec_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"MultibyteCodec",		/* tp_name */
 	sizeof(MultibyteCodecObject),	/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -952,12 +951,11 @@
 {
 	PyObject_GC_UnTrack(self);
 	ERROR_DECREF(self->errors);
-	self->ob_type->tp_free(self);
+	Py_Type(self)->tp_free(self);
 }
 
 static PyTypeObject MultibyteIncrementalEncoder_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"MultibyteIncrementalEncoder",	/* tp_name */
 	sizeof(MultibyteIncrementalEncoderObject), /* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -1153,12 +1151,11 @@
 {
 	PyObject_GC_UnTrack(self);
 	ERROR_DECREF(self->errors);
-	self->ob_type->tp_free(self);
+	Py_Type(self)->tp_free(self);
 }
 
 static PyTypeObject MultibyteIncrementalDecoder_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"MultibyteIncrementalDecoder",	/* tp_name */
 	sizeof(MultibyteIncrementalDecoderObject), /* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -1488,12 +1485,11 @@
 	PyObject_GC_UnTrack(self);
 	ERROR_DECREF(self->errors);
 	Py_DECREF(self->stream);
-	self->ob_type->tp_free(self);
+	Py_Type(self)->tp_free(self);
 }
 
 static PyTypeObject MultibyteStreamReader_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"MultibyteStreamReader",	/* tp_name */
 	sizeof(MultibyteStreamReaderObject), /* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -1692,7 +1688,7 @@
 	PyObject_GC_UnTrack(self);
 	ERROR_DECREF(self->errors);
 	Py_DECREF(self->stream);
-	self->ob_type->tp_free(self);
+	Py_Type(self)->tp_free(self);
 }
 
 static struct PyMethodDef mbstreamwriter_methods[] = {
@@ -1713,8 +1709,7 @@
 };
 
 static PyTypeObject MultibyteStreamWriter_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"MultibyteStreamWriter",	/* tp_name */
 	sizeof(MultibyteStreamWriterObject), /* tp_basicsize */
 	0,				/* tp_itemsize */
diff --git a/Modules/datetimemodule.c b/Modules/datetimemodule.c
index aa037c2..5b2893d 100644
--- a/Modules/datetimemodule.c
+++ b/Modules/datetimemodule.c
@@ -764,7 +764,7 @@
 	PyErr_Format(PyExc_TypeError,
 		     "tzinfo argument must be None or of a tzinfo subclass, "
 		     "not type '%s'",
-		     p->ob_type->tp_name);
+		     Py_Type(p)->tp_name);
 	return -1;
 }
 
@@ -855,7 +855,7 @@
 		PyErr_Format(PyExc_TypeError,
 			     "tzinfo.%s() must return None or "
 			     "timedelta, not '%s'",
-			     name, u->ob_type->tp_name);
+			     name, Py_Type(u)->tp_name);
 	}
 
 	Py_DECREF(u);
@@ -1421,7 +1421,7 @@
 {
 	PyErr_Format(PyExc_TypeError,
 		     "can't compare %s to %s",
-		     a->ob_type->tp_name, b->ob_type->tp_name);
+		     Py_Type(a)->tp_name, Py_Type(b)->tp_name);
 	return NULL;
 }
 
@@ -1865,7 +1865,7 @@
 
 	PyErr_Format(PyExc_TypeError,
 		     "unsupported type for timedelta %s component: %s",
-		     tag, num->ob_type->tp_name);
+		     tag, Py_Type(num)->tp_name);
 	return NULL;
 }
 
@@ -2027,7 +2027,7 @@
 static PyObject *
 delta_reduce(PyDateTime_Delta* self)
 {
-	return Py_BuildValue("ON", self->ob_type, delta_getstate(self));
+	return Py_BuildValue("ON", Py_Type(self), delta_getstate(self));
 }
 
 #define OFFSET(field)  offsetof(PyDateTime_Delta, field)
@@ -2095,8 +2095,7 @@
 };
 
 static PyTypeObject PyDateTime_DeltaType = {
-	PyObject_HEAD_INIT(NULL)
-	0,						/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"datetime.timedelta",				/* tp_name */
 	sizeof(PyDateTime_Delta),			/* tp_basicsize */
 	0,						/* tp_itemsize */
@@ -2504,7 +2503,7 @@
 	tuple = Py_BuildValue("iii", year, month, day);
 	if (tuple == NULL)
 		return NULL;
-	clone = date_new(self->ob_type, tuple, NULL);
+	clone = date_new(Py_Type(self), tuple, NULL);
 	Py_DECREF(tuple);
 	return clone;
 }
@@ -2635,8 +2634,7 @@
 };
 
 static PyTypeObject PyDateTime_DateType = {
-	PyObject_HEAD_INIT(NULL)
-	0,						/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"datetime.date",				/* tp_name */
 	sizeof(PyDateTime_Date),			/* tp_basicsize */
 	0,						/* tp_itemsize */
@@ -2859,10 +2857,10 @@
 
 	if (state == Py_None) {
 		Py_DECREF(state);
-		return Py_BuildValue("(ON)", self->ob_type, args);
+		return Py_BuildValue("(ON)", Py_Type(self), args);
 	}
 	else
-		return Py_BuildValue("(ONN)", self->ob_type, args, state);
+		return Py_BuildValue("(ONN)", Py_Type(self), args, state);
 }
 
 static PyMethodDef tzinfo_methods[] = {
@@ -2890,8 +2888,7 @@
 PyDoc_STR("Abstract base class for time zone info objects.");
 
 static PyTypeObject PyDateTime_TZInfoType = {
-	PyObject_HEAD_INIT(NULL)
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"datetime.tzinfo",			/* tp_name */
 	sizeof(PyDateTime_TZInfo),		/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -3056,7 +3053,7 @@
 	if (HASTZINFO(self)) {
 		Py_XDECREF(self->tzinfo);
 	}
-	self->ob_type->tp_free((PyObject *)self);
+	Py_Type(self)->tp_free((PyObject *)self);
 }
 
 /*
@@ -3089,7 +3086,7 @@
 static PyObject *
 time_repr(PyDateTime_Time *self)
 {
-	const char *type_name = self->ob_type->tp_name;
+	const char *type_name = Py_Type(self)->tp_name;
 	int h = TIME_GET_HOUR(self);
 	int m = TIME_GET_MINUTE(self);
 	int s = TIME_GET_SECOND(self);
@@ -3296,7 +3293,7 @@
 	tuple = Py_BuildValue("iiiiO", hh, mm, ss, us, tzinfo);
 	if (tuple == NULL)
 		return NULL;
-	clone = time_new(self->ob_type, tuple, NULL);
+	clone = time_new(Py_Type(self), tuple, NULL);
 	Py_DECREF(tuple);
 	return clone;
 }
@@ -3350,7 +3347,7 @@
 static PyObject *
 time_reduce(PyDateTime_Time *self, PyObject *arg)
 {
-	return Py_BuildValue("(ON)", self->ob_type, time_getstate(self));
+	return Py_BuildValue("(ON)", Py_Type(self), time_getstate(self));
 }
 
 static PyMethodDef time_methods[] = {
@@ -3400,8 +3397,7 @@
 };
 
 static PyTypeObject PyDateTime_TimeType = {
-	PyObject_HEAD_INIT(NULL)
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"datetime.time",			/* tp_name */
 	sizeof(PyDateTime_Time),		/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -3842,7 +3838,7 @@
 	if (HASTZINFO(self)) {
 		Py_XDECREF(self->tzinfo);
 	}
-	self->ob_type->tp_free((PyObject *)self);
+	Py_Type(self)->tp_free((PyObject *)self);
 }
 
 /*
@@ -3990,7 +3986,7 @@
 static PyObject *
 datetime_repr(PyDateTime_DateTime *self)
 {
-	const char *type_name = self->ob_type->tp_name;
+	const char *type_name = Py_Type(self)->tp_name;
 	PyObject *baserepr;
 
 	if (DATE_GET_MICROSECOND(self)) {
@@ -4206,7 +4202,7 @@
 	tuple = Py_BuildValue("iiiiiiiO", y, m, d, hh, mm, ss, us, tzinfo);
 	if (tuple == NULL)
 		return NULL;
-	clone = datetime_new(self->ob_type, tuple, NULL);
+	clone = datetime_new(Py_Type(self), tuple, NULL);
 	Py_DECREF(tuple);
 	return clone;
 }
@@ -4394,7 +4390,7 @@
 static PyObject *
 datetime_reduce(PyDateTime_DateTime *self, PyObject *arg)
 {
-	return Py_BuildValue("(ON)", self->ob_type, datetime_getstate(self));
+	return Py_BuildValue("(ON)", Py_Type(self), datetime_getstate(self));
 }
 
 static PyMethodDef datetime_methods[] = {
@@ -4494,8 +4490,7 @@
 };
 
 static PyTypeObject PyDateTime_DateTimeType = {
-	PyObject_HEAD_INIT(NULL)
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"datetime.datetime",			/* tp_name */
 	sizeof(PyDateTime_DateTime),		/* tp_basicsize */
 	0,					/* tp_itemsize */
diff --git a/Modules/dbmmodule.c b/Modules/dbmmodule.c
index 6c94df2..ee75fd6 100644
--- a/Modules/dbmmodule.c
+++ b/Modules/dbmmodule.c
@@ -36,7 +36,7 @@
 
 static PyTypeObject Dbmtype;
 
-#define is_dbmobject(v) ((v)->ob_type == &Dbmtype)
+#define is_dbmobject(v) (Py_Type(v) == &Dbmtype)
 #define check_dbmobject_open(v) if ((v)->di_dbm == NULL) \
                { PyErr_SetString(DbmError, "DBM object has already been closed"); \
                  return NULL; }
@@ -333,8 +333,7 @@
 }
 
 static PyTypeObject Dbmtype = {
-	PyObject_HEAD_INIT(NULL)
-	0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"dbm.dbm",
 	sizeof(dbmobject),
 	0,
diff --git a/Modules/dlmodule.c b/Modules/dlmodule.c
index 5654f10..5c582c3 100644
--- a/Modules/dlmodule.c
+++ b/Modules/dlmodule.c
@@ -62,7 +62,7 @@
 		name = PyUnicode_AsString(args);
 	} else {
 		PyErr_Format(PyExc_TypeError, "expected string, found %.200s",
-			     args->ob_type->tp_name);
+			     Py_Type(args)->tp_name);
 		return NULL;
 	}
 	func = dlsym(xp->dl_handle, name);
@@ -143,8 +143,7 @@
 
 
 static PyTypeObject Dltype = {
-	PyObject_HEAD_INIT(NULL)
-	0,			/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"dl.dl",		/*tp_name*/
 	sizeof(dlobject),	/*tp_basicsize*/
 	0,			/*tp_itemsize*/
@@ -239,7 +238,7 @@
 	PyObject *m, *d, *x;
 
 	/* Initialize object type */
-	Dltype.ob_type = &PyType_Type;
+	Py_Type(&Dltype) = &PyType_Type;
 
 	/* Create the module and add the functions */
 	m = Py_InitModule("dl", dl_methods);
diff --git a/Modules/gcmodule.c b/Modules/gcmodule.c
index adcdb5f..5960730 100644
--- a/Modules/gcmodule.c
+++ b/Modules/gcmodule.c
@@ -237,7 +237,7 @@
 	PyGC_Head *gc = containers->gc.gc_next;
 	for (; gc != containers; gc = gc->gc.gc_next) {
 		assert(gc->gc.gc_refs == GC_REACHABLE);
-		gc->gc.gc_refs = FROM_GC(gc)->ob_refcnt;
+		gc->gc.gc_refs = Py_Refcnt(FROM_GC(gc));
 		/* Python's cyclic gc should never see an incoming refcount
 		 * of 0:  if something decref'ed to 0, it should have been
 		 * deallocated immediately at that time.
@@ -289,7 +289,7 @@
 	traverseproc traverse;
 	PyGC_Head *gc = containers->gc.gc_next;
 	for (; gc != containers; gc=gc->gc.gc_next) {
-		traverse = FROM_GC(gc)->ob_type->tp_traverse;
+		traverse = Py_Type(FROM_GC(gc))->tp_traverse;
 		(void) traverse(FROM_GC(gc),
 			       (visitproc)visit_decref,
 			       NULL);
@@ -374,7 +374,7 @@
                          * the next object to visit.
                          */
                         PyObject *op = FROM_GC(gc);
-                        traverseproc traverse = op->ob_type->tp_traverse;
+                        traverseproc traverse = Py_Type(op)->tp_traverse;
                         assert(gc->gc.gc_refs > 0);
                         gc->gc.gc_refs = GC_REACHABLE;
                         (void) traverse(op,
@@ -464,7 +464,7 @@
 	PyGC_Head *gc = finalizers->gc.gc_next;
 	for (; gc != finalizers; gc = gc->gc.gc_next) {
 		/* Note that the finalizers list may grow during this. */
-		traverse = FROM_GC(gc)->ob_type->tp_traverse;
+		traverse = Py_Type(FROM_GC(gc))->tp_traverse;
 		(void) traverse(FROM_GC(gc),
 				(visitproc)visit_move,
 				(void *)finalizers);
@@ -509,7 +509,7 @@
 		assert(IS_TENTATIVELY_UNREACHABLE(op));
 		next = gc->gc.gc_next;
 
-		if (! PyType_SUPPORTS_WEAKREFS(op->ob_type))
+		if (! PyType_SUPPORTS_WEAKREFS(Py_Type(op)))
 			continue;
 
 		/* It supports weakrefs.  Does it have any? */
@@ -629,7 +629,7 @@
 {
 	if (debug & DEBUG_OBJECTS) {
 		PySys_WriteStderr("gc: %.100s <%.100s %p>\n",
-				  msg, op->ob_type->tp_name, op);
+				  msg, Py_Type(op)->tp_name, op);
 	}
 }
 
@@ -683,7 +683,7 @@
 			PyList_Append(garbage, op);
 		}
 		else {
-			if ((clear = op->ob_type->tp_clear) != NULL) {
+			if ((clear = Py_Type(op)->tp_clear) != NULL) {
 				Py_INCREF(op);
 				clear(op);
 				Py_DECREF(op);
@@ -1053,7 +1053,7 @@
 	traverseproc traverse;
 	for (gc = list->gc.gc_next; gc != list; gc = gc->gc.gc_next) {
 		obj = FROM_GC(gc);
-		traverse = obj->ob_type->tp_traverse;
+		traverse = Py_Type(obj)->tp_traverse;
 		if (obj == objs || obj == resultlist)
 			continue;
 		if (traverse(obj, (visitproc)referrersvisit, objs)) {
@@ -1110,7 +1110,7 @@
 
 		if (! PyObject_IS_GC(obj))
 			continue;
-		traverse = obj->ob_type->tp_traverse;
+		traverse = Py_Type(obj)->tp_traverse;
 		if (! traverse)
 			continue;
 		if (traverse(obj, (visitproc)referentsvisit, result)) {
@@ -1332,13 +1332,13 @@
 PyVarObject *
 _PyObject_GC_Resize(PyVarObject *op, Py_ssize_t nitems)
 {
-	const size_t basicsize = _PyObject_VAR_SIZE(op->ob_type, nitems);
+	const size_t basicsize = _PyObject_VAR_SIZE(Py_Type(op), nitems);
 	PyGC_Head *g = AS_GC(op);
 	g = (PyGC_Head *)PyObject_REALLOC(g,  sizeof(PyGC_Head) + basicsize);
 	if (g == NULL)
 		return (PyVarObject *)PyErr_NoMemory();
 	op = (PyVarObject *) FROM_GC(g);
-	op->ob_size = nitems;
+	Py_Size(op) = nitems;
 	return op;
 }
 
diff --git a/Modules/gdbmmodule.c b/Modules/gdbmmodule.c
index f3fee4d..52659e1 100644
--- a/Modules/gdbmmodule.c
+++ b/Modules/gdbmmodule.c
@@ -36,7 +36,7 @@
 
 static PyTypeObject Dbmtype;
 
-#define is_dbmobject(v) ((v)->ob_type == &Dbmtype)
+#define is_dbmobject(v) (Py_Type(v) == &Dbmtype)
 #define check_dbmobject_open(v) if ((v)->di_dbm == NULL) \
     { PyErr_SetString(DbmError, "GDBM object has already been closed"); \
       return NULL; }
@@ -393,8 +393,7 @@
 }
 
 static PyTypeObject Dbmtype = {
-    PyObject_HEAD_INIT(0)
-    0,
+    PyVarObject_HEAD_INIT(0, 0)
     "gdbm.gdbm",
     sizeof(dbmobject),
     0,
diff --git a/Modules/itertoolsmodule.c b/Modules/itertoolsmodule.c
index 2685ca4..b030c12 100644
--- a/Modules/itertoolsmodule.c
+++ b/Modules/itertoolsmodule.c
@@ -59,7 +59,7 @@
 	Py_XDECREF(gbo->tgtkey);
 	Py_XDECREF(gbo->currkey);
 	Py_XDECREF(gbo->currvalue);
-	gbo->ob_type->tp_free(gbo);
+	Py_Type(gbo)->tp_free(gbo);
 }
 
 static int
@@ -139,8 +139,7 @@
 (key, sub-iterator) grouped by each value of key(value).\n");
 
 static PyTypeObject groupby_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.groupby",		/* tp_name */
 	sizeof(groupbyobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -261,8 +260,7 @@
 }
 
 static PyTypeObject _grouper_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools._grouper",		/* tp_name */
 	sizeof(_grouperobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -415,8 +413,7 @@
 PyDoc_STRVAR(teedataobject_doc, "Data container common to multiple tee objects.");
 
 static PyTypeObject teedataobject_type = {
-	PyObject_HEAD_INIT(0)	/* Must fill in type value later */
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(0, 0)	/* Must fill in type value later */
 	"itertools.tee_dataobject",		/* tp_name */
 	sizeof(teedataobject),			/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -572,8 +569,7 @@
 };
 
 static PyTypeObject tee_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.tee",		/* tp_name */
 	sizeof(teeobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -718,7 +714,7 @@
 	PyObject_GC_UnTrack(lz);
 	Py_XDECREF(lz->saved);
 	Py_XDECREF(lz->it);
-	lz->ob_type->tp_free(lz);
+	Py_Type(lz)->tp_free(lz);
 }
 
 static int
@@ -768,8 +764,7 @@
 Then repeat the sequence indefinitely.");
 
 static PyTypeObject cycle_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.cycle",		/* tp_name */
 	sizeof(cycleobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -862,7 +857,7 @@
 	PyObject_GC_UnTrack(lz);
 	Py_XDECREF(lz->func);
 	Py_XDECREF(lz->it);
-	lz->ob_type->tp_free(lz);
+	Py_Type(lz)->tp_free(lz);
 }
 
 static int
@@ -882,7 +877,7 @@
 	PyObject *(*iternext)(PyObject *);
 
 	assert(PyIter_Check(it));
-	iternext = *it->ob_type->tp_iternext;
+	iternext = *Py_Type(it)->tp_iternext;
 	for (;;) {
 		item = iternext(it);
 		if (item == NULL)
@@ -912,8 +907,7 @@
 Afterwards, return every element until the iterable is exhausted.");
 
 static PyTypeObject dropwhile_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.dropwhile",		/* tp_name */
 	sizeof(dropwhileobject),	/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -1006,7 +1000,7 @@
 	PyObject_GC_UnTrack(lz);
 	Py_XDECREF(lz->func);
 	Py_XDECREF(lz->it);
-	lz->ob_type->tp_free(lz);
+	Py_Type(lz)->tp_free(lz);
 }
 
 static int
@@ -1028,7 +1022,7 @@
 		return NULL;
 
 	assert(PyIter_Check(it));
-	item = (*it->ob_type->tp_iternext)(it);
+	item = (*Py_Type(it)->tp_iternext)(it);
 	if (item == NULL)
 		return NULL;
 
@@ -1053,8 +1047,7 @@
 predicate evaluates to true for each entry.");
 
 static PyTypeObject takewhile_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.takewhile",		/* tp_name */
 	sizeof(takewhileobject),	/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -1197,7 +1190,7 @@
 {
 	PyObject_GC_UnTrack(lz);
 	Py_XDECREF(lz->it);
-	lz->ob_type->tp_free(lz);
+	Py_Type(lz)->tp_free(lz);
 }
 
 static int
@@ -1216,7 +1209,7 @@
 	PyObject *(*iternext)(PyObject *);
 
 	assert(PyIter_Check(it));
-	iternext = *it->ob_type->tp_iternext;
+	iternext = *Py_Type(it)->tp_iternext;
 	while (lz->cnt < lz->next) {
 		item = iternext(it);
 		if (item == NULL)
@@ -1249,8 +1242,7 @@
 but returns an iterator.");
 
 static PyTypeObject islice_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.islice",		/* tp_name */
 	sizeof(isliceobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -1341,7 +1333,7 @@
 	PyObject_GC_UnTrack(lz);
 	Py_XDECREF(lz->func);
 	Py_XDECREF(lz->it);
-	lz->ob_type->tp_free(lz);
+	Py_Type(lz)->tp_free(lz);
 }
 
 static int
@@ -1360,7 +1352,7 @@
 	PyObject *it = lz->it;
 
 	assert(PyIter_Check(it));
-	args = (*it->ob_type->tp_iternext)(it);
+	args = (*Py_Type(it)->tp_iternext)(it);
 	if (args == NULL)
 		return NULL;
 	if (!PyTuple_CheckExact(args)) {
@@ -1381,8 +1373,7 @@
 with a argument tuple taken from the given sequence.");
 
 static PyTypeObject starmap_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.starmap",		/* tp_name */
 	sizeof(starmapobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -1487,7 +1478,7 @@
 	PyObject_GC_UnTrack(lz);
 	Py_XDECREF(lz->iters);
 	Py_XDECREF(lz->func);
-	lz->ob_type->tp_free(lz);
+	Py_Type(lz)->tp_free(lz);
 }
 
 static int
@@ -1561,8 +1552,7 @@
 iterables.");
 
 static PyTypeObject imap_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.imap",		/* tp_name */
 	sizeof(imapobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -1666,7 +1656,7 @@
 {
 	PyObject_GC_UnTrack(lz);
 	Py_XDECREF(lz->ittuple);
-	lz->ob_type->tp_free(lz);
+	Py_Type(lz)->tp_free(lz);
 }
 
 static int
@@ -1706,8 +1696,7 @@
 iterable, until all of the iterables are exhausted.");
 
 static PyTypeObject chain_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.chain",		/* tp_name */
 	sizeof(chainobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -1798,7 +1787,7 @@
 	PyObject_GC_UnTrack(lz);
 	Py_XDECREF(lz->func);
 	Py_XDECREF(lz->it);
-	lz->ob_type->tp_free(lz);
+	Py_Type(lz)->tp_free(lz);
 }
 
 static int
@@ -1818,7 +1807,7 @@
 	PyObject *(*iternext)(PyObject *);
 
 	assert(PyIter_Check(it));
-	iternext = *it->ob_type->tp_iternext;
+	iternext = *Py_Type(it)->tp_iternext;
 	for (;;) {
 		item = iternext(it);
 		if (item == NULL)
@@ -1850,8 +1839,7 @@
 If function is None, return the items that are true.");
 
 static PyTypeObject ifilter_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.ifilter",		/* tp_name */
 	sizeof(ifilterobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -1943,7 +1931,7 @@
 	PyObject_GC_UnTrack(lz);
 	Py_XDECREF(lz->func);
 	Py_XDECREF(lz->it);
-	lz->ob_type->tp_free(lz);
+	Py_Type(lz)->tp_free(lz);
 }
 
 static int
@@ -1963,7 +1951,7 @@
 	PyObject *(*iternext)(PyObject *);
 
 	assert(PyIter_Check(it));
-	iternext = *it->ob_type->tp_iternext;
+	iternext = *Py_Type(it)->tp_iternext;
 	for (;;) {
 		item = iternext(it);
 		if (item == NULL)
@@ -1995,8 +1983,7 @@
 If function is None, return the items that are false.");
 
 static PyTypeObject ifilterfalse_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.ifilterfalse",	/* tp_name */
 	sizeof(ifilterfalseobject),	/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -2094,8 +2081,7 @@
 integers starting from zero or, if specified, from firstval.");
 
 static PyTypeObject count_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.count",		/* tp_name */
 	sizeof(countobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -2214,7 +2200,7 @@
 	PyObject_GC_UnTrack(lz);
 	Py_XDECREF(lz->ittuple);
 	Py_XDECREF(lz->result);
-	lz->ob_type->tp_free(lz);
+	Py_Type(lz)->tp_free(lz);
 }
 
 static int
@@ -2237,12 +2223,12 @@
 
 	if (tuplesize == 0)
 		return NULL;
-	if (result->ob_refcnt == 1) {
+	if (Py_Refcnt(result) == 1) {
 		Py_INCREF(result);
 		for (i=0 ; i < tuplesize ; i++) {
 			it = PyTuple_GET_ITEM(lz->ittuple, i);
 			assert(PyIter_Check(it));
-			item = (*it->ob_type->tp_iternext)(it);
+			item = (*Py_Type(it)->tp_iternext)(it);
 			if (item == NULL) {
 				Py_DECREF(result);
 				return NULL;
@@ -2258,7 +2244,7 @@
 		for (i=0 ; i < tuplesize ; i++) {
 			it = PyTuple_GET_ITEM(lz->ittuple, i);
 			assert(PyIter_Check(it));
-			item = (*it->ob_type->tp_iternext)(it);
+			item = (*Py_Type(it)->tp_iternext)(it);
 			if (item == NULL) {
 				Py_DECREF(result);
 				return NULL;
@@ -2280,8 +2266,7 @@
 a list.");
 
 static PyTypeObject izip_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.izip",		/* tp_name */
 	sizeof(izipobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -2365,7 +2350,7 @@
 {
 	PyObject_GC_UnTrack(ro);
 	Py_XDECREF(ro->element);
-	ro->ob_type->tp_free(ro);
+	Py_Type(ro)->tp_free(ro);
 }
 
 static int
@@ -2418,8 +2403,7 @@
 endlessly.");
 
 static PyTypeObject repeat_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.repeat",		/* tp_name */
 	sizeof(repeatobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -2551,7 +2535,7 @@
 	Py_XDECREF(lz->ittuple);
 	Py_XDECREF(lz->result);
 	Py_XDECREF(lz->fillvalue);
-	lz->ob_type->tp_free(lz);
+	Py_Type(lz)->tp_free(lz);
 }
 
 static int
@@ -2577,7 +2561,7 @@
 		return NULL;
         if (lz->numactive == 0)
                 return NULL;
-	if (result->ob_refcnt == 1) {
+	if (Py_Refcnt(result) == 1) {
 		Py_INCREF(result);
 		for (i=0 ; i < tuplesize ; i++) {
 			it = PyTuple_GET_ITEM(lz->ittuple, i);
@@ -2586,7 +2570,7 @@
                                 item = lz->fillvalue;
                         } else {
                                 assert(PyIter_Check(it));
-                                item = (*it->ob_type->tp_iternext)(it);
+                                item = (*Py_Type(it)->tp_iternext)(it);
                                 if (item == NULL) {
                                         lz->numactive -= 1;      
                                         if (lz->numactive == 0) {
@@ -2615,7 +2599,7 @@
                                 item = lz->fillvalue;
                         } else {
                                 assert(PyIter_Check(it));
-                                item = (*it->ob_type->tp_iternext)(it);
+                                item = (*Py_Type(it)->tp_iternext)(it);
                                 if (item == NULL) {
                                         lz->numactive -= 1;      
                                         if (lz->numactive == 0) {
@@ -2647,8 +2631,7 @@
 ");
 
 static PyTypeObject iziplongest_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.izip_longest",	/* tp_name */
 	sizeof(iziplongestobject),	/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -2747,7 +2730,7 @@
 		NULL
 	};
 
-	teedataobject_type.ob_type = &PyType_Type;
+	Py_Type(&teedataobject_type) = &PyType_Type;
 	m = Py_InitModule3("itertools", module_methods, module_doc);
 	if (m == NULL)
 		return;
diff --git a/Modules/linuxaudiodev.c b/Modules/linuxaudiodev.c
index b435d76..730ec0c 100644
--- a/Modules/linuxaudiodev.c
+++ b/Modules/linuxaudiodev.c
@@ -441,8 +441,7 @@
 }
 
 static PyTypeObject Ladtype = {
-    PyObject_HEAD_INIT(&PyType_Type)
-    0,				/*ob_size*/
+    PyVarObject_HEAD_INIT(&PyType_Type, 0)
     "linuxaudiodev.linux_audio_device", /*tp_name*/
     sizeof(lad_t),		/*tp_size*/
     0,				/*tp_itemsize*/
diff --git a/Modules/mathmodule.c b/Modules/mathmodule.c
index 632dffd..3d5640c 100644
--- a/Modules/mathmodule.c
+++ b/Modules/mathmodule.c
@@ -229,7 +229,7 @@
 		   log(x) + log(2) * e * SHIFT.
 		   CAUTION:  e*SHIFT may overflow using int arithmetic,
 		   so force use of double. */
-		x = func(x) + (e * (double)SHIFT) * func(2.0);
+		x = func(x) + (e * (double)PyLong_SHIFT) * func(2.0);
 		return PyFloat_FromDouble(x);
 	}
 
diff --git a/Modules/mmapmodule.c b/Modules/mmapmodule.c
index 5afe715..29f458f 100644
--- a/Modules/mmapmodule.c
+++ b/Modules/mmapmodule.c
@@ -782,8 +782,7 @@
 };
 
 static PyTypeObject mmap_object_type = {
-	PyObject_HEAD_INIT(0) /* patched in module init */
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(0, 0) /* patched in module init */
 	"mmap.mmap",				/* tp_name */
 	sizeof(mmap_object),			/* tp_size */
 	0,					/* tp_itemsize */
@@ -1141,7 +1140,7 @@
 	PyObject *dict, *module;
 
 	/* Patch the object type */
-	mmap_object_type.ob_type = &PyType_Type;
+	Py_Type(&mmap_object_type) = &PyType_Type;
 
 	module = Py_InitModule("mmap", mmap_functions);
 	if (module == NULL)
diff --git a/Modules/operator.c b/Modules/operator.c
index fbc7470..b088d93 100644
--- a/Modules/operator.c
+++ b/Modules/operator.c
@@ -387,8 +387,7 @@
 After, g=itemgetter(2,5,3), the call g(r) returns (r[2], r[5], r[3])");
 
 static PyTypeObject itemgetter_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"operator.itemgetter",		/* tp_name */
 	sizeof(itemgetterobject),	/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -525,8 +524,7 @@
 After, g=attrgetter('name', 'date'), the call g(r) returns (r.name, r.date).");
 
 static PyTypeObject attrgetter_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"operator.attrgetter",		/* tp_name */
 	sizeof(attrgetterobject),	/* tp_basicsize */
 	0,				/* tp_itemsize */
diff --git a/Modules/ossaudiodev.c b/Modules/ossaudiodev.c
index eb59c4d..ebf101a 100644
--- a/Modules/ossaudiodev.c
+++ b/Modules/ossaudiodev.c
@@ -841,8 +841,7 @@
 }
 
 static PyTypeObject OSSAudioType = {
-    PyObject_HEAD_INIT(&PyType_Type)
-    0,                          /*ob_size*/
+    PyVarObject_HEAD_INIT(&PyType_Type, 0)
     "ossaudiodev.oss_audio_device", /*tp_name*/
     sizeof(oss_audio_t),        /*tp_size*/
     0,                          /*tp_itemsize*/
@@ -856,8 +855,7 @@
 };
 
 static PyTypeObject OSSMixerType = {
-    PyObject_HEAD_INIT(&PyType_Type)
-    0,                              /*ob_size*/
+    PyVarObject_HEAD_INIT(&PyType_Type, 0)
     "ossaudiodev.oss_mixer_device", /*tp_name*/
     sizeof(oss_mixer_t),            /*tp_size*/
     0,                              /*tp_itemsize*/
diff --git a/Modules/parsermodule.c b/Modules/parsermodule.c
index 8289173..efc7176 100644
--- a/Modules/parsermodule.c
+++ b/Modules/parsermodule.c
@@ -166,8 +166,7 @@
 
 static
 PyTypeObject PyST_Type = {
-    PyObject_HEAD_INIT(NULL)
-    0,
+    PyVarObject_HEAD_INIT(NULL, 0)
     "parser.st",                        /* tp_name              */
     (int) sizeof(PyST_Object),          /* tp_basicsize         */
     0,                                  /* tp_itemsize          */
@@ -694,7 +693,7 @@
                 PyErr_Format(parser_error,
                              "second item in terminal node must be a string,"
                              " found %s",
-                             temp->ob_type->tp_name);
+                             Py_Type(temp)->tp_name);
                 Py_DECREF(temp);
                 return 0;
             }
@@ -707,7 +706,7 @@
                         PyErr_Format(parser_error,
                                      "third item in terminal node must be an"
                                      " integer, found %s",
-				     temp->ob_type->tp_name);
+				     Py_Type(temp)->tp_name);
                         Py_DECREF(o);
                         Py_DECREF(temp);
                         return 0;
@@ -3049,7 +3048,7 @@
 {
     PyObject *module, *copyreg;
 
-    PyST_Type.ob_type = &PyType_Type;
+    Py_Type(&PyST_Type) = &PyType_Type;
     module = Py_InitModule("parser", parser_functions);
     if (module == NULL)
     	return;
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index a2068ac..9d4d14f 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -2577,7 +2577,7 @@
 	long intval;
 	if (PyFloat_Check(t)) {
 		double tval = PyFloat_AsDouble(t);
-		PyObject *intobj = t->ob_type->tp_as_number->nb_int(t);
+		PyObject *intobj = Py_Type(t)->tp_as_number->nb_int(t);
 		if (!intobj)
 			return -1;
 		intval = PyInt_AsLong(intobj);
diff --git a/Modules/pyexpat.c b/Modules/pyexpat.c
index c583edf..13c1d27 100644
--- a/Modules/pyexpat.c
+++ b/Modules/pyexpat.c
@@ -927,7 +927,7 @@
     if (!PyString_Check(str)) {
         PyErr_Format(PyExc_TypeError,
                      "read() did not return a string object (type=%.400s)",
-                     str->ob_type->tp_name);
+                     Py_Type(str)->tp_name);
         goto finally;
     }
     len = PyString_GET_SIZE(str);
@@ -1621,8 +1621,7 @@
 PyDoc_STRVAR(Xmlparsetype__doc__, "XML parser");
 
 static PyTypeObject Xmlparsetype = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"pyexpat.xmlparser",		/*tp_name*/
 	sizeof(xmlparseobject) + PyGC_HEAD_SIZE,/*tp_basicsize*/
 	0,				/*tp_itemsize*/
@@ -1790,7 +1789,7 @@
     if (modelmod_name == NULL)
         return;
 
-    Xmlparsetype.ob_type = &PyType_Type;
+    Py_Type(&Xmlparsetype) = &PyType_Type;
 
     /* Create the module and add the functions */
     m = Py_InitModule3(MODULE_NAME, pyexpat_methods,
diff --git a/Modules/selectmodule.c b/Modules/selectmodule.c
index 9eaae84..995f8e7 100644
--- a/Modules/selectmodule.c
+++ b/Modules/selectmodule.c
@@ -587,8 +587,7 @@
 static PyTypeObject poll_Type = {
 	/* The ob_type field must be initialized in the module init function
 	 * to be portable to Windows without using C++. */
-	PyObject_HEAD_INIT(NULL)
-	0,			/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"select.poll",		/*tp_name*/
 	sizeof(pollObject),	/*tp_basicsize*/
 	0,			/*tp_itemsize*/
@@ -706,7 +705,7 @@
 #else
 	{
 #endif
-		poll_Type.ob_type = &PyType_Type;
+		Py_Type(&poll_Type) = &PyType_Type;
 		PyModule_AddIntConstant(m, "POLLIN", POLLIN);
 		PyModule_AddIntConstant(m, "POLLPRI", POLLPRI);
 		PyModule_AddIntConstant(m, "POLLOUT", POLLOUT);
diff --git a/Modules/sha256module.c b/Modules/sha256module.c
index f81608c..5b49c9f 100644
--- a/Modules/sha256module.c
+++ b/Modules/sha256module.c
@@ -409,7 +409,7 @@
 {
     SHAobject *newobj;
 
-    if (((PyObject*)self)->ob_type == &SHA256type) {
+    if (Py_Type(self) == &SHA256type) {
         if ( (newobj = newSHA256object())==NULL)
             return NULL;
     } else {
@@ -536,8 +536,7 @@
 };
 
 static PyTypeObject SHA224type = {
-    PyObject_HEAD_INIT(NULL)
-    0,			/*ob_size*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "_sha256.sha224",	/*tp_name*/
     sizeof(SHAobject),	/*tp_size*/
     0,			/*tp_itemsize*/
@@ -571,8 +570,7 @@
 };
 
 static PyTypeObject SHA256type = {
-    PyObject_HEAD_INIT(NULL)
-    0,			/*ob_size*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "_sha256.sha256",	/*tp_name*/
     sizeof(SHAobject),	/*tp_size*/
     0,			/*tp_itemsize*/
@@ -689,10 +687,10 @@
 {
     PyObject *m;
 
-    SHA224type.ob_type = &PyType_Type;
+    Py_Type(&SHA224type) = &PyType_Type;
     if (PyType_Ready(&SHA224type) < 0)
         return;
-    SHA256type.ob_type = &PyType_Type;
+    Py_Type(&SHA256type) = &PyType_Type;
     if (PyType_Ready(&SHA256type) < 0)
         return;
     m = Py_InitModule("_sha256", SHA_functions);
diff --git a/Modules/sha512module.c b/Modules/sha512module.c
index f2aae3a..5eedb4c 100644
--- a/Modules/sha512module.c
+++ b/Modules/sha512module.c
@@ -602,8 +602,7 @@
 };
 
 static PyTypeObject SHA384type = {
-    PyObject_HEAD_INIT(NULL)
-    0,			/*ob_size*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "_sha512.sha384",	/*tp_name*/
     sizeof(SHAobject),	/*tp_size*/
     0,			/*tp_itemsize*/
@@ -637,8 +636,7 @@
 };
 
 static PyTypeObject SHA512type = {
-    PyObject_HEAD_INIT(NULL)
-    0,			/*ob_size*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "_sha512.sha512",	/*tp_name*/
     sizeof(SHAobject),	/*tp_size*/
     0,			/*tp_itemsize*/
@@ -755,10 +753,10 @@
 {
     PyObject *m;
 
-    SHA384type.ob_type = &PyType_Type;
+    Py_Type(&SHA384type) = &PyType_Type;
     if (PyType_Ready(&SHA384type) < 0)
         return;
-    SHA512type.ob_type = &PyType_Type;
+    Py_Type(&SHA512type) = &PyType_Type;
     if (PyType_Ready(&SHA512type) < 0)
         return;
     m = Py_InitModule("_sha512", SHA_functions);
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index 5243640..f6f577e 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -1247,7 +1247,7 @@
 				PyExc_TypeError,
 				"getsockaddrarg: "
 				"AF_NETLINK address must be tuple, not %.500s",
-				args->ob_type->tp_name);
+				Py_Type(args)->tp_name);
 			return 0;
 		}
 		if (!PyArg_ParseTuple(args, "II:getsockaddrarg", &pid, &groups))
@@ -1270,7 +1270,7 @@
 				PyExc_TypeError,
 				"getsockaddrarg: "
 				"AF_INET address must be tuple, not %.500s",
-				args->ob_type->tp_name);
+				Py_Type(args)->tp_name);
 			return 0;
 		}
 		if (!PyArg_ParseTuple(args, "eti:getsockaddrarg",
@@ -1300,7 +1300,7 @@
 				PyExc_TypeError,
 				"getsockaddrarg: "
 				"AF_INET6 address must be tuple, not %.500s",
-				args->ob_type->tp_name);
+				Py_Type(args)->tp_name);
 			return 0;
 		}
 		if (!PyArg_ParseTuple(args, "eti|ii",
@@ -1422,7 +1422,7 @@
 				PyExc_TypeError,
 				"getsockaddrarg: "
 				"AF_PACKET address must be tuple, not %.500s",
-				args->ob_type->tp_name);
+				Py_Type(args)->tp_name);
 			return 0;
 		}
 		if (!PyArg_ParseTuple(args, "si|iis#", &interfaceName,
@@ -2771,7 +2771,7 @@
 {
 	if (s->sock_fd != -1)
 		(void) SOCKETCLOSE(s->sock_fd);
-	s->ob_type->tp_free((PyObject *)s);
+	Py_Type(s)->tp_free((PyObject *)s);
 }
 
 
@@ -2861,8 +2861,7 @@
 /* Type object for socket objects. */
 
 static PyTypeObject sock_type = {
-	PyObject_HEAD_INIT(0)	/* Must fill in type value later */
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(0, 0)	/* Must fill in type value later */
 	"_socket.socket",			/* tp_name */
 	sizeof(PySocketSockObject),		/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -3445,7 +3444,7 @@
 	else
 		return PyErr_Format(PyExc_TypeError,
 				    "expected int/long, %s found",
-				    arg->ob_type->tp_name);
+				    Py_Type(arg)->tp_name);
 	if (x == (unsigned long) -1 && PyErr_Occurred())
 		return NULL;
 	return PyLong_FromUnsignedLong(ntohl(x));
@@ -3504,7 +3503,7 @@
 	else
 		return PyErr_Format(PyExc_TypeError,
 				    "expected int/long, %s found",
-				    arg->ob_type->tp_name);
+				    Py_Type(arg)->tp_name);
 	return PyLong_FromUnsignedLong(htonl((unsigned long)x));
 }
 
@@ -4142,7 +4141,7 @@
 	if (!os_init())
 		return;
 
-	sock_type.ob_type = &PyType_Type;
+	Py_Type(&sock_type) = &PyType_Type;
 	m = Py_InitModule3(PySocket_MODULE_NAME,
 			   socket_methods,
 			   socket_doc);
diff --git a/Modules/sunaudiodev.c b/Modules/sunaudiodev.c
index 802184d..4288403 100644
--- a/Modules/sunaudiodev.c
+++ b/Modules/sunaudiodev.c
@@ -42,8 +42,8 @@
 
 static PyObject *SunAudioError;
 
-#define is_sadobject(v)		((v)->ob_type == &Sadtype)
-#define is_sadstatusobject(v)	((v)->ob_type == &Sadstatustype)
+#define is_sadobject(v)		(Py_Type(v) == &Sadtype)
+#define is_sadstatusobject(v)	(Py_Type(v) == &Sadstatustype)
 
 
 static sadobject *
@@ -409,8 +409,7 @@
 
 
 static PyTypeObject Sadtype = {
-	PyObject_HEAD_INIT(&PyType_Type)
-	0,				/*ob_size*/
+	PyVarObject_HEAD_INIT(&PyType_Type, 0)
 	"sunaudiodev.sun_audio_device",	/*tp_name*/
 	sizeof(sadobject),		/*tp_size*/
 	0,				/*tp_itemsize*/
@@ -424,8 +423,7 @@
 };
 
 static PyTypeObject Sadstatustype = {
-	PyObject_HEAD_INIT(&PyType_Type)
-	0,				/*ob_size*/
+	PyVarObject_HEAD_INIT(&PyType_Type, 0)
 	"sunaudiodev.sun_audio_device_status", /*tp_name*/
 	sizeof(sadstatusobject),	/*tp_size*/
 	0,				/*tp_itemsize*/
diff --git a/Modules/threadmodule.c b/Modules/threadmodule.c
index 61ad5d3..62ea660 100644
--- a/Modules/threadmodule.c
+++ b/Modules/threadmodule.c
@@ -126,8 +126,7 @@
 }
 
 static PyTypeObject Locktype = {
-	PyObject_HEAD_INIT(&PyType_Type)
-	0,				/*ob_size*/
+	PyVarObject_HEAD_INIT(&PyType_Type, 0)
 	"thread.lock",			/*tp_name*/
 	sizeof(lockobject),		/*tp_size*/
 	0,				/*tp_itemsize*/
@@ -251,7 +250,7 @@
 	}
 
 	local_clear(self);
-	self->ob_type->tp_free((PyObject*)self);
+	Py_Type(self)->tp_free((PyObject*)self);
 }
 
 static PyObject *
@@ -283,8 +282,8 @@
 		Py_INCREF(ldict);
 		self->dict = ldict; /* still borrowed */
 
-		if (self->ob_type->tp_init != PyBaseObject_Type.tp_init &&
-		    self->ob_type->tp_init((PyObject*)self, 
+		if (Py_Type(self)->tp_init != PyBaseObject_Type.tp_init &&
+		    Py_Type(self)->tp_init((PyObject*)self, 
 					   self->args, self->kw) < 0) {
 			/* we need to get rid of ldict from thread so
 			   we create a new one the next time we do an attr
@@ -336,8 +335,7 @@
 static PyObject *local_getattro(localobject *, PyObject *);
 
 static PyTypeObject localtype = {
-	PyObject_HEAD_INIT(NULL)
-	/* ob_size           */ 0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	/* tp_name           */ "thread._local",
 	/* tp_basicsize      */ sizeof(localobject),
 	/* tp_itemsize       */ 0,
@@ -388,7 +386,7 @@
 	if (ldict == NULL) 
 		return NULL;
 
-	if (self->ob_type != &localtype)
+	if (Py_Type(self) != &localtype)
 		/* use generic lookup for subtypes */
 		return PyObject_GenericGetAttr((PyObject *)self, name);
 
diff --git a/Modules/unicodedata.c b/Modules/unicodedata.c
index f660046..5a2515c 100644
--- a/Modules/unicodedata.c
+++ b/Modules/unicodedata.c
@@ -1134,8 +1134,7 @@
 static PyTypeObject UCD_Type = {
 	/* The ob_type field must be initialized in the module init function
 	 * to be portable to Windows without using C++. */
-	PyObject_HEAD_INIT(NULL)
-	0,			/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"unicodedata.UCD",		/*tp_name*/
 	sizeof(PreviousDBVersion),	/*tp_basicsize*/
 	0,			/*tp_itemsize*/
@@ -1193,7 +1192,7 @@
 {
     PyObject *m, *v;
 
-    UCD_Type.ob_type = &PyType_Type;
+    Py_Type(&UCD_Type) = &PyType_Type;
 
     m = Py_InitModule3(
         "unicodedata", unicodedata_functions, unicodedata_docstring);
diff --git a/Modules/xxmodule.c b/Modules/xxmodule.c
index ea66eef..0923f81 100644
--- a/Modules/xxmodule.c
+++ b/Modules/xxmodule.c
@@ -25,7 +25,7 @@
 
 static PyTypeObject Xxo_Type;
 
-#define XxoObject_Check(v)	((v)->ob_type == &Xxo_Type)
+#define XxoObject_Check(v)	(Py_Type(v) == &Xxo_Type)
 
 static XxoObject *
 newXxoObject(PyObject *arg)
@@ -97,8 +97,7 @@
 static PyTypeObject Xxo_Type = {
 	/* The ob_type field must be initialized in the module init function
 	 * to be portable to Windows without using C++. */
-	PyObject_HEAD_INIT(NULL)
-	0,			/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"xxmodule.Xxo",		/*tp_name*/
 	sizeof(XxoObject),	/*tp_basicsize*/
 	0,			/*tp_itemsize*/
@@ -216,8 +215,7 @@
 static PyTypeObject Str_Type = {
 	/* The ob_type field must be initialized in the module init function
 	 * to be portable to Windows without using C++. */
-	PyObject_HEAD_INIT(NULL)
-	0,			/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"xxmodule.Str",		/*tp_name*/
 	0,			/*tp_basicsize*/
 	0,			/*tp_itemsize*/
@@ -272,8 +270,7 @@
 static PyTypeObject Null_Type = {
 	/* The ob_type field must be initialized in the module init function
 	 * to be portable to Windows without using C++. */
-	PyObject_HEAD_INIT(NULL)
-	0,			/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"xxmodule.Null",	/*tp_name*/
 	0,			/*tp_basicsize*/
 	0,			/*tp_itemsize*/
diff --git a/Modules/xxsubtype.c b/Modules/xxsubtype.c
index 88ce6c5..0cf0b81 100644
--- a/Modules/xxsubtype.c
+++ b/Modules/xxsubtype.c
@@ -101,8 +101,7 @@
 };
 
 static PyTypeObject spamlist_type = {
-	PyObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type))
-	0,
+	PyVarObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type), 0)
 	"xxsubtype.spamlist",
 	sizeof(spamlistobject),
 	0,
@@ -193,8 +192,7 @@
 };
 
 static PyTypeObject spamdict_type = {
-	PyObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type))
-	0,
+	PyVarObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type), 0)
 	"xxsubtype.spamdict",
 	sizeof(spamdictobject),
 	0,
diff --git a/Modules/zipimport.c b/Modules/zipimport.c
index b56e6f5..bf913f3 100644
--- a/Modules/zipimport.c
+++ b/Modules/zipimport.c
@@ -181,7 +181,7 @@
 	Py_XDECREF(self->archive);
 	Py_XDECREF(self->prefix);
 	Py_XDECREF(self->files);
-	self->ob_type->tp_free((PyObject *)self);
+	Py_Type(self)->tp_free((PyObject *)self);
 }
 
 static PyObject *
@@ -557,8 +557,7 @@
 #define DEFERRED_ADDRESS(ADDR) 0
 
 static PyTypeObject ZipImporter_Type = {
-	PyObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type))
-	0,
+	PyVarObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type), 0)
 	"zipimport.zipimporter",
 	sizeof(ZipImporter),
 	0,					/* tp_itemsize */
diff --git a/Modules/zlibmodule.c b/Modules/zlibmodule.c
index 51395a2..badc090 100644
--- a/Modules/zlibmodule.c
+++ b/Modules/zlibmodule.c
@@ -961,8 +961,7 @@
 };
 
 static PyTypeObject Comptype = {
-    PyObject_HEAD_INIT(0)
-    0,
+    PyVarObject_HEAD_INIT(0, 0)
     "zlib.Compress",
     sizeof(compobject),
     0,
@@ -978,8 +977,7 @@
 };
 
 static PyTypeObject Decomptype = {
-    PyObject_HEAD_INIT(0)
-    0,
+    PyVarObject_HEAD_INIT(0, 0)
     "zlib.Decompress",
     sizeof(compobject),
     0,
@@ -1013,8 +1011,8 @@
 PyInit_zlib(void)
 {
     PyObject *m, *ver;
-    Comptype.ob_type = &PyType_Type;
-    Decomptype.ob_type = &PyType_Type;
+    Py_Type(&Comptype) = &PyType_Type;
+    Py_Type(&Decomptype) = &PyType_Type;
     m = Py_InitModule4("zlib", zlib_methods,
 		       zlib_module_documentation,
 		       (PyObject*)NULL,PYTHON_API_VERSION);