Copy in CPython's descrobject.c

Not using it in this commit, just wanted to
get the unmodified version in so it's easier to see the changes.

from_cpython/Objects/descrobject.c

+/* Descriptors -- a new, flexible way to describe attributes */
+
+#include "Python.h"
+#include "structmember.h" /* Why is this not included in Python.h? */
+
+static void
+descr_dealloc(PyDescrObject *descr)
+{
+    _PyObject_GC_UNTRACK(descr);
+    Py_XDECREF(descr->d_type);
+    Py_XDECREF(descr->d_name);
+    PyObject_GC_Del(descr);
+}
+
+static char *
+descr_name(PyDescrObject *descr)
+{
+    if (descr->d_name != NULL && PyString_Check(descr->d_name))
+        return PyString_AS_STRING(descr->d_name);
+    else
+        return "?";
+}
+
+static PyObject *
+descr_repr(PyDescrObject *descr, char *format)
+{
+    return PyString_FromFormat(format, descr_name(descr),
+                               descr->d_type->tp_name);
+}
+
+static PyObject *
+method_repr(PyMethodDescrObject *descr)
+{
+    return descr_repr((PyDescrObject *)descr,
+                      "<method '%s' of '%s' objects>");
+}
+
+static PyObject *
+member_repr(PyMemberDescrObject *descr)
+{
+    return descr_repr((PyDescrObject *)descr,
+                      "<member '%s' of '%s' objects>");
+}
+
+static PyObject *
+getset_repr(PyGetSetDescrObject *descr)
+{
+    return descr_repr((PyDescrObject *)descr,
+                      "<attribute '%s' of '%s' objects>");
+}
+
+static PyObject *
+wrapperdescr_repr(PyWrapperDescrObject *descr)
+{
+    return descr_repr((PyDescrObject *)descr,
+                      "<slot wrapper '%s' of '%s' objects>");
+}
+
+static int
+descr_check(PyDescrObject *descr, PyObject *obj, PyObject **pres)
+{
+    if (obj == NULL) {
+        Py_INCREF(descr);
+        *pres = (PyObject *)descr;
+        return 1;
+    }
+    if (!PyObject_TypeCheck(obj, descr->d_type)) {
+        PyErr_Format(PyExc_TypeError,
+                     "descriptor '%s' for '%s' objects "
+                     "doesn't apply to '%s' object",
+                     descr_name((PyDescrObject *)descr),
+                     descr->d_type->tp_name,
+                     obj->ob_type->tp_name);
+        *pres = NULL;
+        return 1;
+    }
+    return 0;
+}
+
+static PyObject *
+classmethod_get(PyMethodDescrObject *descr, PyObject *obj, PyObject *type)
+{
+    /* Ensure a valid type.  Class methods ignore obj. */
+    if (type == NULL) {
+        if (obj != NULL)
+            type = (PyObject *)obj->ob_type;
+        else {
+            /* Wot - no type?! */
+            PyErr_Format(PyExc_TypeError,
+                         "descriptor '%s' for type '%s' "
+                         "needs either an object or a type",
+                         descr_name((PyDescrObject *)descr),
+                         descr->d_type->tp_name);
+            return NULL;
+        }
+    }
+    if (!PyType_Check(type)) {
+        PyErr_Format(PyExc_TypeError,
+                     "descriptor '%s' for type '%s' "
+                     "needs a type, not a '%s' as arg 2",
+                     descr_name((PyDescrObject *)descr),
+                     descr->d_type->tp_name,
+                     type->ob_type->tp_name);
+        return NULL;
+    }
+    if (!PyType_IsSubtype((PyTypeObject *)type, descr->d_type)) {
+        PyErr_Format(PyExc_TypeError,
+                     "descriptor '%s' for type '%s' "
+                     "doesn't apply to type '%s'",
+                     descr_name((PyDescrObject *)descr),
+                     descr->d_type->tp_name,
+                     ((PyTypeObject *)type)->tp_name);
+        return NULL;
+    }
+    return PyCFunction_New(descr->d_method, type);
+}
+
+static PyObject *
+method_get(PyMethodDescrObject *descr, PyObject *obj, PyObject *type)
+{
+    PyObject *res;
+
+    if (descr_check((PyDescrObject *)descr, obj, &res))
+        return res;
+    return PyCFunction_New(descr->d_method, obj);
+}
+
+static PyObject *
+member_get(PyMemberDescrObject *descr, PyObject *obj, PyObject *type)
+{
+    PyObject *res;
+
+    if (descr_check((PyDescrObject *)descr, obj, &res))
+        return res;
+    return PyMember_GetOne((char *)obj, descr->d_member);
+}
+
+static PyObject *
+getset_get(PyGetSetDescrObject *descr, PyObject *obj, PyObject *type)
+{
+    PyObject *res;
+
+    if (descr_check((PyDescrObject *)descr, obj, &res))
+        return res;
+    if (descr->d_getset->get != NULL)
+        return descr->d_getset->get(obj, descr->d_getset->closure);
+    PyErr_Format(PyExc_AttributeError,
+                 "attribute '%.300s' of '%.100s' objects is not readable",
+                 descr_name((PyDescrObject *)descr),
+                 descr->d_type->tp_name);
+    return NULL;
+}
+
+static PyObject *
+wrapperdescr_get(PyWrapperDescrObject *descr, PyObject *obj, PyObject *type)
+{
+    PyObject *res;
+
+    if (descr_check((PyDescrObject *)descr, obj, &res))
+        return res;
+    return PyWrapper_New((PyObject *)descr, obj);
+}
+
+static int
+descr_setcheck(PyDescrObject *descr, PyObject *obj, PyObject *value,
+               int *pres)
+{
+    assert(obj != NULL);
+    if (!PyObject_TypeCheck(obj, descr->d_type)) {
+        PyErr_Format(PyExc_TypeError,
+                     "descriptor '%.200s' for '%.100s' objects "
+                     "doesn't apply to '%.100s' object",
+                     descr_name(descr),
+                     descr->d_type->tp_name,
+                     obj->ob_type->tp_name);
+        *pres = -1;
+        return 1;
+    }
+    return 0;
+}
+
+static int
+member_set(PyMemberDescrObject *descr, PyObject *obj, PyObject *value)
+{
+    int res;
+
+    if (descr_setcheck((PyDescrObject *)descr, obj, value, &res))
+        return res;
+    return PyMember_SetOne((char *)obj, descr->d_member, value);
+}
+
+static int
+getset_set(PyGetSetDescrObject *descr, PyObject *obj, PyObject *value)
+{
+    int res;
+
+    if (descr_setcheck((PyDescrObject *)descr, obj, value, &res))
+        return res;
+    if (descr->d_getset->set != NULL)
+        return descr->d_getset->set(obj, value,
+                                    descr->d_getset->closure);
+    PyErr_Format(PyExc_AttributeError,
+                 "attribute '%.300s' of '%.100s' objects is not writable",
+                 descr_name((PyDescrObject *)descr),
+                 descr->d_type->tp_name);
+    return -1;
+}
+
+static PyObject *
+methoddescr_call(PyMethodDescrObject *descr, PyObject *args, PyObject *kwds)
+{
+    Py_ssize_t argc;
+    PyObject *self, *func, *result;
+
+    /* Make sure that the first argument is acceptable as 'self' */
+    assert(PyTuple_Check(args));
+    argc = PyTuple_GET_SIZE(args);
+    if (argc < 1) {
+        PyErr_Format(PyExc_TypeError,
+                     "descriptor '%.300s' of '%.100s' "
+                     "object needs an argument",
+                     descr_name((PyDescrObject *)descr),
+                     descr->d_type->tp_name);
+        return NULL;
+    }
+    self = PyTuple_GET_ITEM(args, 0);
+    if (!_PyObject_RealIsSubclass((PyObject *)Py_TYPE(self),
+                                  (PyObject *)(descr->d_type))) {
+        PyErr_Format(PyExc_TypeError,
+                     "descriptor '%.200s' "
+                     "requires a '%.100s' object "
+                     "but received a '%.100s'",
+                     descr_name((PyDescrObject *)descr),
+                     descr->d_type->tp_name,
+                     self->ob_type->tp_name);
+        return NULL;
+    }
+
+    func = PyCFunction_New(descr->d_method, self);
+    if (func == NULL)
+        return NULL;
+    args = PyTuple_GetSlice(args, 1, argc);
+    if (args == NULL) {
+        Py_DECREF(func);
+        return NULL;
+    }
+    result = PyEval_CallObjectWithKeywords(func, args, kwds);
+    Py_DECREF(args);
+    Py_DECREF(func);
+    return result;
+}
+
+static PyObject *
+classmethoddescr_call(PyMethodDescrObject *descr, PyObject *args,
+                      PyObject *kwds)
+{
+    Py_ssize_t argc;
+    PyObject *self, *func, *result;
+
+    /* Make sure that the first argument is acceptable as 'self' */
+    assert(PyTuple_Check(args));
+    argc = PyTuple_GET_SIZE(args);
+    if (argc < 1) {
+        PyErr_Format(PyExc_TypeError,
+                     "descriptor '%s' of '%.100s' "
+                     "object needs an argument",
+                     descr_name((PyDescrObject *)descr),
+                     descr->d_type->tp_name);
+        return NULL;
+    }
+    self = PyTuple_GET_ITEM(args, 0);
+    if (!PyType_Check(self)) {
+        PyErr_Format(PyExc_TypeError,
+                     "descriptor '%s' requires a type "
+                     "but received a '%.100s'",
+                     descr_name((PyDescrObject *)descr),
+                     self->ob_type->tp_name);
+        return NULL;
+    }
+    if (!PyType_IsSubtype((PyTypeObject *)self, descr->d_type)) {
+        PyErr_Format(PyExc_TypeError,
+                     "descriptor '%s' "
+                     "requires a subtype of '%.100s' "
+                     "but received '%.100s",
+                     descr_name((PyDescrObject *)descr),
+                     descr->d_type->tp_name,
+                     self->ob_type->tp_name);
+        return NULL;
+    }
+
+    func = PyCFunction_New(descr->d_method, self);
+    if (func == NULL)
+        return NULL;
+    args = PyTuple_GetSlice(args, 1, argc);
+    if (args == NULL) {
+        Py_DECREF(func);
+        return NULL;
+    }
+    result = PyEval_CallObjectWithKeywords(func, args, kwds);
+    Py_DECREF(func);
+    Py_DECREF(args);
+    return result;
+}
+
+static PyObject *
+wrapperdescr_call(PyWrapperDescrObject *descr, PyObject *args, PyObject *kwds)
+{
+    Py_ssize_t argc;
+    PyObject *self, *func, *result;
+
+    /* Make sure that the first argument is acceptable as 'self' */
+    assert(PyTuple_Check(args));
+    argc = PyTuple_GET_SIZE(args);
+    if (argc < 1) {
+        PyErr_Format(PyExc_TypeError,
+                     "descriptor '%.300s' of '%.100s' "
+                     "object needs an argument",
+                     descr_name((PyDescrObject *)descr),
+                     descr->d_type->tp_name);
+        return NULL;
+    }
+    self = PyTuple_GET_ITEM(args, 0);
+    if (!_PyObject_RealIsSubclass((PyObject *)Py_TYPE(self),
+                                  (PyObject *)(descr->d_type))) {
+        PyErr_Format(PyExc_TypeError,
+                     "descriptor '%.200s' "
+                     "requires a '%.100s' object "
+                     "but received a '%.100s'",
+                     descr_name((PyDescrObject *)descr),
+                     descr->d_type->tp_name,
+                     self->ob_type->tp_name);
+        return NULL;
+    }
+
+    func = PyWrapper_New((PyObject *)descr, self);
+    if (func == NULL)
+        return NULL;
+    args = PyTuple_GetSlice(args, 1, argc);
+    if (args == NULL) {
+        Py_DECREF(func);
+        return NULL;
+    }
+    result = PyEval_CallObjectWithKeywords(func, args, kwds);
+    Py_DECREF(args);
+    Py_DECREF(func);
+    return result;
+}
+
+static PyObject *
+method_get_doc(PyMethodDescrObject *descr, void *closure)
+{
+    if (descr->d_method->ml_doc == NULL) {
+        Py_INCREF(Py_None);
+        return Py_None;
+    }
+    return PyString_FromString(descr->d_method->ml_doc);
+}
+
+static PyMemberDef descr_members[] = {
+    {"__objclass__", T_OBJECT, offsetof(PyDescrObject, d_type), READONLY},
+    {"__name__", T_OBJECT, offsetof(PyDescrObject, d_name), READONLY},
+    {0}
+};
+
+static PyGetSetDef method_getset[] = {
+    {"__doc__", (getter)method_get_doc},
+    {0}
+};
+
+static PyObject *
+member_get_doc(PyMemberDescrObject *descr, void *closure)
+{
+    if (descr->d_member->doc == NULL) {
+        Py_INCREF(Py_None);
+        return Py_None;
+    }
+    return PyString_FromString(descr->d_member->doc);
+}
+
+static PyGetSetDef member_getset[] = {
+    {"__doc__", (getter)member_get_doc},
+    {0}
+};
+
+static PyObject *
+getset_get_doc(PyGetSetDescrObject *descr, void *closure)
+{
+    if (descr->d_getset->doc == NULL) {
+        Py_INCREF(Py_None);
+        return Py_None;
+    }
+    return PyString_FromString(descr->d_getset->doc);
+}
+
+static PyGetSetDef getset_getset[] = {
+    {"__doc__", (getter)getset_get_doc},
+    {0}
+};
+
+static PyObject *
+wrapperdescr_get_doc(PyWrapperDescrObject *descr, void *closure)
+{
+    if (descr->d_base->doc == NULL) {
+        Py_INCREF(Py_None);
+        return Py_None;
+    }
+    return PyString_FromString(descr->d_base->doc);
+}
+
+static PyGetSetDef wrapperdescr_getset[] = {
+    {"__doc__", (getter)wrapperdescr_get_doc},
+    {0}
+};
+
+static int
+descr_traverse(PyObject *self, visitproc visit, void *arg)
+{
+    PyDescrObject *descr = (PyDescrObject *)self;
+    Py_VISIT(descr->d_type);
+    return 0;
+}
+
+static PyTypeObject PyMethodDescr_Type = {
+    PyVarObject_HEAD_INIT(&PyType_Type, 0)
+    "method_descriptor",
+    sizeof(PyMethodDescrObject),
+    0,
+    (destructor)descr_dealloc,                  /* tp_dealloc */
+    0,                                          /* tp_print */
+    0,                                          /* tp_getattr */
+    0,                                          /* tp_setattr */
+    0,                                          /* tp_compare */
+    (reprfunc)method_repr,                      /* tp_repr */
+    0,                                          /* tp_as_number */
+    0,                                          /* tp_as_sequence */
+    0,                                          /* tp_as_mapping */
+    0,                                          /* tp_hash */
+    (ternaryfunc)methoddescr_call,              /* tp_call */
+    0,                                          /* tp_str */
+    PyObject_GenericGetAttr,                    /* tp_getattro */
+    0,                                          /* tp_setattro */
+    0,                                          /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
+    0,                                          /* tp_doc */
+    descr_traverse,                             /* tp_traverse */
+    0,                                          /* tp_clear */
+    0,                                          /* tp_richcompare */
+    0,                                          /* tp_weaklistoffset */
+    0,                                          /* tp_iter */
+    0,                                          /* tp_iternext */
+    0,                                          /* tp_methods */
+    descr_members,                              /* tp_members */
+    method_getset,                              /* tp_getset */
+    0,                                          /* tp_base */
+    0,                                          /* tp_dict */
+    (descrgetfunc)method_get,                   /* tp_descr_get */
+    0,                                          /* tp_descr_set */
+};
+
+/* This is for METH_CLASS in C, not for "f = classmethod(f)" in Python! */
+static PyTypeObject PyClassMethodDescr_Type = {
+    PyVarObject_HEAD_INIT(&PyType_Type, 0)
+    "classmethod_descriptor",
+    sizeof(PyMethodDescrObject),
+    0,
+    (destructor)descr_dealloc,                  /* tp_dealloc */
+    0,                                          /* tp_print */
+    0,                                          /* tp_getattr */
+    0,                                          /* tp_setattr */
+    0,                                          /* tp_compare */
+    (reprfunc)method_repr,                      /* tp_repr */
+    0,                                          /* tp_as_number */
+    0,                                          /* tp_as_sequence */
+    0,                                          /* tp_as_mapping */
+    0,                                          /* tp_hash */
+    (ternaryfunc)classmethoddescr_call,         /* tp_call */
+    0,                                          /* tp_str */
+    PyObject_GenericGetAttr,                    /* tp_getattro */
+    0,                                          /* tp_setattro */
+    0,                                          /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
+    0,                                          /* tp_doc */
+    descr_traverse,                             /* tp_traverse */
+    0,                                          /* tp_clear */
+    0,                                          /* tp_richcompare */
+    0,                                          /* tp_weaklistoffset */
+    0,                                          /* tp_iter */
+    0,                                          /* tp_iternext */
+    0,                                          /* tp_methods */
+    descr_members,                              /* tp_members */
+    method_getset,                              /* tp_getset */
+    0,                                          /* tp_base */
+    0,                                          /* tp_dict */
+    (descrgetfunc)classmethod_get,              /* tp_descr_get */
+    0,                                          /* tp_descr_set */
+};
+
+PyTypeObject PyMemberDescr_Type = {
+    PyVarObject_HEAD_INIT(&PyType_Type, 0)
+    "member_descriptor",
+    sizeof(PyMemberDescrObject),
+    0,
+    (destructor)descr_dealloc,                  /* tp_dealloc */
+    0,                                          /* tp_print */
+    0,                                          /* tp_getattr */
+    0,                                          /* tp_setattr */
+    0,                                          /* tp_compare */
+    (reprfunc)member_repr,                      /* tp_repr */
+    0,                                          /* tp_as_number */
+    0,                                          /* tp_as_sequence */
+    0,                                          /* tp_as_mapping */
+    0,                                          /* tp_hash */
+    0,                                          /* tp_call */
+    0,                                          /* tp_str */
+    PyObject_GenericGetAttr,                    /* tp_getattro */
+    0,                                          /* tp_setattro */
+    0,                                          /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
+    0,                                          /* tp_doc */
+    descr_traverse,                             /* tp_traverse */
+    0,                                          /* tp_clear */
+    0,                                          /* tp_richcompare */
+    0,                                          /* tp_weaklistoffset */
+    0,                                          /* tp_iter */
+    0,                                          /* tp_iternext */
+    0,                                          /* tp_methods */
+    descr_members,                              /* tp_members */
+    member_getset,                              /* tp_getset */
+    0,                                          /* tp_base */
+    0,                                          /* tp_dict */
+    (descrgetfunc)member_get,                   /* tp_descr_get */
+    (descrsetfunc)member_set,                   /* tp_descr_set */
+};
+
+PyTypeObject PyGetSetDescr_Type = {
+    PyVarObject_HEAD_INIT(&PyType_Type, 0)
+    "getset_descriptor",
+    sizeof(PyGetSetDescrObject),
+    0,
+    (destructor)descr_dealloc,                  /* tp_dealloc */
+    0,                                          /* tp_print */
+    0,                                          /* tp_getattr */
+    0,                                          /* tp_setattr */
+    0,                                          /* tp_compare */
+    (reprfunc)getset_repr,                      /* tp_repr */
+    0,                                          /* tp_as_number */
+    0,                                          /* tp_as_sequence */
+    0,                                          /* tp_as_mapping */
+    0,                                          /* tp_hash */
+    0,                                          /* tp_call */
+    0,                                          /* tp_str */
+    PyObject_GenericGetAttr,                    /* tp_getattro */
+    0,                                          /* tp_setattro */
+    0,                                          /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
+    0,                                          /* tp_doc */
+    descr_traverse,                             /* tp_traverse */
+    0,                                          /* tp_clear */
+    0,                                          /* tp_richcompare */
+    0,                                          /* tp_weaklistoffset */
+    0,                                          /* tp_iter */
+    0,                                          /* tp_iternext */
+    0,                                          /* tp_methods */
+    descr_members,                              /* tp_members */
+    getset_getset,                              /* tp_getset */
+    0,                                          /* tp_base */
+    0,                                          /* tp_dict */
+    (descrgetfunc)getset_get,                   /* tp_descr_get */
+    (descrsetfunc)getset_set,                   /* tp_descr_set */
+};
+
+PyTypeObject PyWrapperDescr_Type = {
+    PyVarObject_HEAD_INIT(&PyType_Type, 0)
+    "wrapper_descriptor",
+    sizeof(PyWrapperDescrObject),
+    0,
+    (destructor)descr_dealloc,                  /* tp_dealloc */
+    0,                                          /* tp_print */
+    0,                                          /* tp_getattr */
+    0,                                          /* tp_setattr */
+    0,                                          /* tp_compare */
+    (reprfunc)wrapperdescr_repr,                /* tp_repr */
+    0,                                          /* tp_as_number */
+    0,                                          /* tp_as_sequence */
+    0,                                          /* tp_as_mapping */
+    0,                                          /* tp_hash */
+    (ternaryfunc)wrapperdescr_call,             /* tp_call */
+    0,                                          /* tp_str */
+    PyObject_GenericGetAttr,                    /* tp_getattro */
+    0,                                          /* tp_setattro */
+    0,                                          /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
+    0,                                          /* tp_doc */
+    descr_traverse,                             /* tp_traverse */
+    0,                                          /* tp_clear */
+    0,                                          /* tp_richcompare */
+    0,                                          /* tp_weaklistoffset */
+    0,                                          /* tp_iter */
+    0,                                          /* tp_iternext */
+    0,                                          /* tp_methods */
+    descr_members,                              /* tp_members */
+    wrapperdescr_getset,                        /* tp_getset */
+    0,                                          /* tp_base */
+    0,                                          /* tp_dict */
+    (descrgetfunc)wrapperdescr_get,             /* tp_descr_get */
+    0,                                          /* tp_descr_set */
+};
+
+static PyDescrObject *
+descr_new(PyTypeObject *descrtype, PyTypeObject *type, const char *name)
+{
+    PyDescrObject *descr;
+
+    descr = (PyDescrObject *)PyType_GenericAlloc(descrtype, 0);
+    if (descr != NULL) {
+        Py_XINCREF(type);
+        descr->d_type = type;
+        descr->d_name = PyString_InternFromString(name);
+        if (descr->d_name == NULL) {
+            Py_DECREF(descr);
+            descr = NULL;
+        }
+    }
+    return descr;
+}
+
+PyObject *
+PyDescr_NewMethod(PyTypeObject *type, PyMethodDef *method)
+{
+    PyMethodDescrObject *descr;
+
+    descr = (PyMethodDescrObject *)descr_new(&PyMethodDescr_Type,
+                                             type, method->ml_name);
+    if (descr != NULL)
+        descr->d_method = method;
+    return (PyObject *)descr;
+}
+
+PyObject *
+PyDescr_NewClassMethod(PyTypeObject *type, PyMethodDef *method)
+{
+    PyMethodDescrObject *descr;
+
+    descr = (PyMethodDescrObject *)descr_new(&PyClassMethodDescr_Type,
+                                             type, method->ml_name);
+    if (descr != NULL)
+        descr->d_method = method;
+    return (PyObject *)descr;
+}
+
+PyObject *
+PyDescr_NewMember(PyTypeObject *type, PyMemberDef *member)
+{
+    PyMemberDescrObject *descr;
+
+    descr = (PyMemberDescrObject *)descr_new(&PyMemberDescr_Type,
+                                             type, member->name);
+    if (descr != NULL)
+        descr->d_member = member;
+    return (PyObject *)descr;
+}
+
+PyObject *
+PyDescr_NewGetSet(PyTypeObject *type, PyGetSetDef *getset)
+{
+    PyGetSetDescrObject *descr;
+
+    descr = (PyGetSetDescrObject *)descr_new(&PyGetSetDescr_Type,
+                                             type, getset->name);
+    if (descr != NULL)
+        descr->d_getset = getset;
+    return (PyObject *)descr;
+}
+
+PyObject *
+PyDescr_NewWrapper(PyTypeObject *type, struct wrapperbase *base, void *wrapped)
+{
+    PyWrapperDescrObject *descr;
+
+    descr = (PyWrapperDescrObject *)descr_new(&PyWrapperDescr_Type,
+                                             type, base->name);
+    if (descr != NULL) {
+        descr->d_base = base;
+        descr->d_wrapped = wrapped;
+    }
+    return (PyObject *)descr;
+}
+
+
+/* --- Readonly proxy for dictionaries (actually any mapping) --- */
+
+/* This has no reason to be in this file except that adding new files is a
+   bit of a pain */
+
+typedef struct {
+    PyObject_HEAD
+    PyObject *dict;
+} proxyobject;
+
+static Py_ssize_t
+proxy_len(proxyobject *pp)
+{
+    return PyObject_Size(pp->dict);
+}
+
+static PyObject *
+proxy_getitem(proxyobject *pp, PyObject *key)
+{
+    return PyObject_GetItem(pp->dict, key);
+}
+
+static PyMappingMethods proxy_as_mapping = {
+    (lenfunc)proxy_len,                         /* mp_length */
+    (binaryfunc)proxy_getitem,                  /* mp_subscript */
+    0,                                          /* mp_ass_subscript */
+};
+
+static int
+proxy_contains(proxyobject *pp, PyObject *key)
+{
+    return PyDict_Contains(pp->dict, key);
+}
+
+static PySequenceMethods proxy_as_sequence = {
+    0,                                          /* sq_length */
+    0,                                          /* sq_concat */
+    0,                                          /* sq_repeat */
+    0,                                          /* sq_item */
+    0,                                          /* sq_slice */
+    0,                                          /* sq_ass_item */
+    0,                                          /* sq_ass_slice */
+    (objobjproc)proxy_contains,                 /* sq_contains */
+    0,                                          /* sq_inplace_concat */
+    0,                                          /* sq_inplace_repeat */
+};
+
+static PyObject *
+proxy_has_key(proxyobject *pp, PyObject *key)
+{
+    int res = PyDict_Contains(pp->dict, key);
+    if (res < 0)
+        return NULL;
+    return PyBool_FromLong(res);
+}
+
+static PyObject *
+proxy_get(proxyobject *pp, PyObject *args)
+{
+    PyObject *key, *def = Py_None;
+
+    if (!PyArg_UnpackTuple(args, "get", 1, 2, &key, &def))
+        return NULL;
+    return PyObject_CallMethod(pp->dict, "get", "(OO)", key, def);
+}
+
+static PyObject *
+proxy_keys(proxyobject *pp)
+{
+    return PyMapping_Keys(pp->dict);
+}
+
+static PyObject *
+proxy_values(proxyobject *pp)
+{
+    return PyMapping_Values(pp->dict);
+}
+
+static PyObject *
+proxy_items(proxyobject *pp)
+{
+    return PyMapping_Items(pp->dict);
+}
+
+static PyObject *
+proxy_iterkeys(proxyobject *pp)
+{
+    return PyObject_CallMethod(pp->dict, "iterkeys", NULL);
+}
+
+static PyObject *
+proxy_itervalues(proxyobject *pp)
+{
+    return PyObject_CallMethod(pp->dict, "itervalues", NULL);
+}
+
+static PyObject *
+proxy_iteritems(proxyobject *pp)
+{
+    return PyObject_CallMethod(pp->dict, "iteritems", NULL);
+}
+static PyObject *
+proxy_copy(proxyobject *pp)
+{
+    return PyObject_CallMethod(pp->dict, "copy", NULL);
+}
+
+static PyMethodDef proxy_methods[] = {
+    {"has_key",   (PyCFunction)proxy_has_key,    METH_O,
+     PyDoc_STR("D.has_key(k) -> True if D has a key k, else False")},
+    {"get",       (PyCFunction)proxy_get,        METH_VARARGS,
+     PyDoc_STR("D.get(k[,d]) -> D[k] if D.has_key(k), else d."
+                                    "  d defaults to None.")},
+    {"keys",      (PyCFunction)proxy_keys,       METH_NOARGS,
+     PyDoc_STR("D.keys() -> list of D's keys")},
+    {"values",    (PyCFunction)proxy_values,     METH_NOARGS,
+     PyDoc_STR("D.values() -> list of D's values")},
+    {"items",     (PyCFunction)proxy_items,      METH_NOARGS,
+     PyDoc_STR("D.items() -> list of D's (key, value) pairs, as 2-tuples")},
+    {"iterkeys",  (PyCFunction)proxy_iterkeys,   METH_NOARGS,
+     PyDoc_STR("D.iterkeys() -> an iterator over the keys of D")},
+    {"itervalues",(PyCFunction)proxy_itervalues, METH_NOARGS,
+     PyDoc_STR("D.itervalues() -> an iterator over the values of D")},
+    {"iteritems", (PyCFunction)proxy_iteritems,  METH_NOARGS,
+     PyDoc_STR("D.iteritems() ->"
+               " an iterator over the (key, value) items of D")},
+    {"copy",      (PyCFunction)proxy_copy,       METH_NOARGS,
+     PyDoc_STR("D.copy() -> a shallow copy of D")},
+    {0}
+};
+
+static void
+proxy_dealloc(proxyobject *pp)
+{
+    _PyObject_GC_UNTRACK(pp);
+    Py_DECREF(pp->dict);
+    PyObject_GC_Del(pp);
+}
+
+static PyObject *
+proxy_getiter(proxyobject *pp)
+{
+    return PyObject_GetIter(pp->dict);
+}
+
+static PyObject *
+proxy_str(proxyobject *pp)
+{
+    return PyObject_Str(pp->dict);
+}
+
+static PyObject *
+proxy_repr(proxyobject *pp)
+{
+    PyObject *dictrepr;
+    PyObject *result;
+
+    dictrepr = PyObject_Repr(pp->dict);
+    if (dictrepr == NULL)
+        return NULL;
+    result = PyString_FromFormat("dict_proxy(%s)", PyString_AS_STRING(dictrepr));
+    Py_DECREF(dictrepr);
+    return result;
+}
+
+static int
+proxy_traverse(PyObject *self, visitproc visit, void *arg)
+{
+    proxyobject *pp = (proxyobject *)self;
+    Py_VISIT(pp->dict);
+    return 0;
+}
+
+static int
+proxy_compare(proxyobject *v, PyObject *w)
+{
+    return PyObject_Compare(v->dict, w);
+}
+
+static PyObject *
+proxy_richcompare(proxyobject *v, PyObject *w, int op)
+{
+    return PyObject_RichCompare(v->dict, w, op);
+}
+
+PyTypeObject PyDictProxy_Type = {
+    PyVarObject_HEAD_INIT(&PyType_Type, 0)
+    "dictproxy",                                /* tp_name */
+    sizeof(proxyobject),                        /* tp_basicsize */
+    0,                                          /* tp_itemsize */
+    /* methods */
+    (destructor)proxy_dealloc,                  /* tp_dealloc */
+    0,                                          /* tp_print */
+    0,                                          /* tp_getattr */
+    0,                                          /* tp_setattr */
+    (cmpfunc)proxy_compare,                     /* tp_compare */
+    (reprfunc)proxy_repr,                       /* tp_repr */
+    0,                                          /* tp_as_number */
+    &proxy_as_sequence,                         /* tp_as_sequence */
+    &proxy_as_mapping,                          /* tp_as_mapping */
+    0,                                          /* tp_hash */
+    0,                                          /* tp_call */
+    (reprfunc)proxy_str,                        /* tp_str */
+    PyObject_GenericGetAttr,                    /* tp_getattro */
+    0,                                          /* tp_setattro */
+    0,                                          /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
+    0,                                          /* tp_doc */
+    proxy_traverse,                             /* tp_traverse */
+    0,                                          /* tp_clear */
+    (richcmpfunc)proxy_richcompare,             /* tp_richcompare */
+    0,                                          /* tp_weaklistoffset */
+    (getiterfunc)proxy_getiter,                 /* tp_iter */
+    0,                                          /* tp_iternext */
+    proxy_methods,                              /* tp_methods */
+    0,                                          /* tp_members */
+    0,                                          /* tp_getset */
+    0,                                          /* tp_base */
+    0,                                          /* tp_dict */
+    0,                                          /* tp_descr_get */
+    0,                                          /* tp_descr_set */
+};
+
+PyObject *
+PyDictProxy_New(PyObject *dict)
+{
+    proxyobject *pp;
+
+    pp = PyObject_GC_New(proxyobject, &PyDictProxy_Type);
+    if (pp != NULL) {
+        Py_INCREF(dict);
+        pp->dict = dict;
+        _PyObject_GC_TRACK(pp);
+    }
+    return (PyObject *)pp;
+}
+
+
+/* --- Wrapper object for "slot" methods --- */
+
+/* This has no reason to be in this file except that adding new files is a
+   bit of a pain */
+
+typedef struct {
+    PyObject_HEAD
+    PyWrapperDescrObject *descr;
+    PyObject *self;
+} wrapperobject;
+
+static void
+wrapper_dealloc(wrapperobject *wp)
+{
+    PyObject_GC_UnTrack(wp);
+    Py_TRASHCAN_SAFE_BEGIN(wp)
+    Py_XDECREF(wp->descr);
+    Py_XDECREF(wp->self);
+    PyObject_GC_Del(wp);
+    Py_TRASHCAN_SAFE_END(wp)
+}
+
+static int
+wrapper_compare(wrapperobject *a, wrapperobject *b)
+{
+    if (a->descr == b->descr)
+        return PyObject_Compare(a->self, b->self);
+    else
+        return (a->descr < b->descr) ? -1 : 1;
+}
+
+static long
+wrapper_hash(wrapperobject *wp)
+{
+    int x, y;
+    x = _Py_HashPointer(wp->descr);
+    if (x == -1)
+        return -1;
+    y = PyObject_Hash(wp->self);
+    if (y == -1)
+        return -1;
+    x = x ^ y;
+    if (x == -1)
+        x = -2;
+    return x;
+}
+
+static PyObject *
+wrapper_repr(wrapperobject *wp)
+{
+    return PyString_FromFormat("<method-wrapper '%s' of %s object at %p>",
+                               wp->descr->d_base->name,
+                               wp->self->ob_type->tp_name,
+                               wp->self);
+}
+
+static PyMemberDef wrapper_members[] = {
+    {"__self__", T_OBJECT, offsetof(wrapperobject, self), READONLY},
+    {0}
+};
+
+static PyObject *
+wrapper_objclass(wrapperobject *wp)
+{
+    PyObject *c = (PyObject *)wp->descr->d_type;
+
+    Py_INCREF(c);
+    return c;
+}
+
+static PyObject *
+wrapper_name(wrapperobject *wp)
+{
+    char *s = wp->descr->d_base->name;
+
+    return PyString_FromString(s);
+}
+
+static PyObject *
+wrapper_doc(wrapperobject *wp)
+{
+    char *s = wp->descr->d_base->doc;
+
+    if (s == NULL) {
+        Py_INCREF(Py_None);
+        return Py_None;
+    }
+    else {
+        return PyString_FromString(s);
+    }
+}
+
+static PyGetSetDef wrapper_getsets[] = {
+    {"__objclass__", (getter)wrapper_objclass},
+    {"__name__", (getter)wrapper_name},
+    {"__doc__", (getter)wrapper_doc},
+    {0}
+};
+
+static PyObject *
+wrapper_call(wrapperobject *wp, PyObject *args, PyObject *kwds)
+{
+    wrapperfunc wrapper = wp->descr->d_base->wrapper;
+    PyObject *self = wp->self;
+
+    if (wp->descr->d_base->flags & PyWrapperFlag_KEYWORDS) {
+        wrapperfunc_kwds wk = (wrapperfunc_kwds)wrapper;
+        return (*wk)(self, args, wp->descr->d_wrapped, kwds);
+    }
+
+    if (kwds != NULL && (!PyDict_Check(kwds) || PyDict_Size(kwds) != 0)) {
+        PyErr_Format(PyExc_TypeError,
+                     "wrapper %s doesn't take keyword arguments",
+                     wp->descr->d_base->name);
+        return NULL;
+    }
+    return (*wrapper)(self, args, wp->descr->d_wrapped);
+}
+
+static int
+wrapper_traverse(PyObject *self, visitproc visit, void *arg)
+{
+    wrapperobject *wp = (wrapperobject *)self;
+    Py_VISIT(wp->descr);
+    Py_VISIT(wp->self);
+    return 0;
+}
+
+static PyTypeObject wrappertype = {
+    PyVarObject_HEAD_INIT(&PyType_Type, 0)
+    "method-wrapper",                           /* tp_name */
+    sizeof(wrapperobject),                      /* tp_basicsize */
+    0,                                          /* tp_itemsize */
+    /* methods */
+    (destructor)wrapper_dealloc,                /* tp_dealloc */
+    0,                                          /* tp_print */
+    0,                                          /* tp_getattr */
+    0,                                          /* tp_setattr */
+    (cmpfunc)wrapper_compare,                   /* tp_compare */
+    (reprfunc)wrapper_repr,                     /* tp_repr */
+    0,                                          /* tp_as_number */
+    0,                                          /* tp_as_sequence */
+    0,                                          /* tp_as_mapping */
+    (hashfunc)wrapper_hash,                     /* tp_hash */
+    (ternaryfunc)wrapper_call,                  /* tp_call */
+    0,                                          /* tp_str */
+    PyObject_GenericGetAttr,                    /* tp_getattro */
+    0,                                          /* tp_setattro */
+    0,                                          /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
+    0,                                          /* tp_doc */
+    wrapper_traverse,                           /* tp_traverse */
+    0,                                          /* tp_clear */
+    0,                                          /* tp_richcompare */
+    0,                                          /* tp_weaklistoffset */
+    0,                                          /* tp_iter */
+    0,                                          /* tp_iternext */
+    0,                                          /* tp_methods */
+    wrapper_members,                            /* tp_members */
+    wrapper_getsets,                            /* tp_getset */
+    0,                                          /* tp_base */
+    0,                                          /* tp_dict */
+    0,                                          /* tp_descr_get */
+    0,                                          /* tp_descr_set */
+};
+
+PyObject *
+PyWrapper_New(PyObject *d, PyObject *self)
+{
+    wrapperobject *wp;
+    PyWrapperDescrObject *descr;
+
+    assert(PyObject_TypeCheck(d, &PyWrapperDescr_Type));
+    descr = (PyWrapperDescrObject *)d;
+    assert(_PyObject_RealIsSubclass((PyObject *)Py_TYPE(self),
+                                    (PyObject *)(descr->d_type)));
+
+    wp = PyObject_GC_New(wrapperobject, &wrappertype);
+    if (wp != NULL) {
+        Py_INCREF(descr);
+        wp->descr = descr;
+        Py_INCREF(self);
+        wp->self = self;
+        _PyObject_GC_TRACK(wp);
+    }
+    return (PyObject *)wp;
+}
+
+
+/* A built-in 'property' type */
+
+/*
+    class property(object):
+
+    def __init__(self, fget=None, fset=None, fdel=None, doc=None):
+        if doc is None and fget is not None and hasattr(fget, "__doc__"):
+        doc = fget.__doc__
+        self.__get = fget
+        self.__set = fset
+        self.__del = fdel
+        self.__doc__ = doc
+
+    def __get__(self, inst, type=None):
+        if inst is None:
+        return self
+        if self.__get is None:
+        raise AttributeError, "unreadable attribute"
+        return self.__get(inst)
+
+    def __set__(self, inst, value):
+        if self.__set is None:
+        raise AttributeError, "can't set attribute"
+        return self.__set(inst, value)
+
+    def __delete__(self, inst):
+        if self.__del is None:
+        raise AttributeError, "can't delete attribute"
+        return self.__del(inst)
+
+*/
+
+typedef struct {
+    PyObject_HEAD
+    PyObject *prop_get;
+    PyObject *prop_set;
+    PyObject *prop_del;
+    PyObject *prop_doc;
+    int getter_doc;
+} propertyobject;
+
+static PyObject * property_copy(PyObject *, PyObject *, PyObject *,
+                                  PyObject *);
+
+static PyMemberDef property_members[] = {
+    {"fget", T_OBJECT, offsetof(propertyobject, prop_get), READONLY},
+    {"fset", T_OBJECT, offsetof(propertyobject, prop_set), READONLY},
+    {"fdel", T_OBJECT, offsetof(propertyobject, prop_del), READONLY},
+    {"__doc__",  T_OBJECT, offsetof(propertyobject, prop_doc), READONLY},
+    {0}
+};
+
+
+PyDoc_STRVAR(getter_doc,
+             "Descriptor to change the getter on a property.");
+
+static PyObject *
+property_getter(PyObject *self, PyObject *getter)
+{
+    return property_copy(self, getter, NULL, NULL);
+}
+
+
+PyDoc_STRVAR(setter_doc,
+             "Descriptor to change the setter on a property.");
+
+static PyObject *
+property_setter(PyObject *self, PyObject *setter)
+{
+    return property_copy(self, NULL, setter, NULL);
+}
+
+
+PyDoc_STRVAR(deleter_doc,
+             "Descriptor to change the deleter on a property.");
+
+static PyObject *
+property_deleter(PyObject *self, PyObject *deleter)
+{
+    return property_copy(self, NULL, NULL, deleter);
+}
+
+
+static PyMethodDef property_methods[] = {
+    {"getter", property_getter, METH_O, getter_doc},
+    {"setter", property_setter, METH_O, setter_doc},
+    {"deleter", property_deleter, METH_O, deleter_doc},
+    {0}
+};
+
+
+static void
+property_dealloc(PyObject *self)
+{
+    propertyobject *gs = (propertyobject *)self;
+
+    _PyObject_GC_UNTRACK(self);
+    Py_XDECREF(gs->prop_get);
+    Py_XDECREF(gs->prop_set);
+    Py_XDECREF(gs->prop_del);
+    Py_XDECREF(gs->prop_doc);
+    self->ob_type->tp_free(self);
+}
+
+static PyObject *
+property_descr_get(PyObject *self, PyObject *obj, PyObject *type)
+{
+    propertyobject *gs = (propertyobject *)self;
+
+    if (obj == NULL || obj == Py_None) {
+        Py_INCREF(self);
+        return self;
+    }
+    if (gs->prop_get == NULL) {
+        PyErr_SetString(PyExc_AttributeError, "unreadable attribute");
+        return NULL;
+    }
+    return PyObject_CallFunction(gs->prop_get, "(O)", obj);
+}
+
+static int
+property_descr_set(PyObject *self, PyObject *obj, PyObject *value)
+{
+    propertyobject *gs = (propertyobject *)self;
+    PyObject *func, *res;
+
+    if (value == NULL)
+        func = gs->prop_del;
+    else
+        func = gs->prop_set;
+    if (func == NULL) {
+        PyErr_SetString(PyExc_AttributeError,
+                        value == NULL ?
+                        "can't delete attribute" :
+                "can't set attribute");
+        return -1;
+    }
+    if (value == NULL)
+        res = PyObject_CallFunction(func, "(O)", obj);
+    else
+        res = PyObject_CallFunction(func, "(OO)", obj, value);
+    if (res == NULL)
+        return -1;
+    Py_DECREF(res);
+    return 0;
+}
+
+static PyObject *
+property_copy(PyObject *old, PyObject *get, PyObject *set, PyObject *del)
+{
+    propertyobject *pold = (propertyobject *)old;
+    PyObject *new, *type, *doc;
+
+    type = PyObject_Type(old);
+    if (type == NULL)
+        return NULL;
+
+    if (get == NULL || get == Py_None) {
+        Py_XDECREF(get);
+        get = pold->prop_get ? pold->prop_get : Py_None;
+    }
+    if (set == NULL || set == Py_None) {
+        Py_XDECREF(set);
+        set = pold->prop_set ? pold->prop_set : Py_None;
+    }
+    if (del == NULL || del == Py_None) {
+        Py_XDECREF(del);
+        del = pold->prop_del ? pold->prop_del : Py_None;
+    }
+    if (pold->getter_doc && get != Py_None) {
+        /* make _init use __doc__ from getter */
+        doc = Py_None;
+    }
+    else {
+        doc = pold->prop_doc ? pold->prop_doc : Py_None;
+    }
+
+    new =  PyObject_CallFunction(type, "OOOO", get, set, del, doc);
+    Py_DECREF(type);
+    if (new == NULL)
+        return NULL;
+    return new;
+}
+
+static int
+property_init(PyObject *self, PyObject *args, PyObject *kwds)
+{
+    PyObject *get = NULL, *set = NULL, *del = NULL, *doc = NULL;
+    static char *kwlist[] = {"fget", "fset", "fdel", "doc", 0};
+    propertyobject *prop = (propertyobject *)self;
+
+    if (!PyArg_ParseTupleAndKeywords(args, kwds, "|OOOO:property",
+                                     kwlist, &get, &set, &del, &doc))
+        return -1;
+
+    if (get == Py_None)
+        get = NULL;
+    if (set == Py_None)
+        set = NULL;
+    if (del == Py_None)
+        del = NULL;
+
+    Py_XINCREF(get);
+    Py_XINCREF(set);
+    Py_XINCREF(del);
+    Py_XINCREF(doc);
+
+    prop->prop_get = get;
+    prop->prop_set = set;
+    prop->prop_del = del;
+    prop->prop_doc = doc;
+    prop->getter_doc = 0;
+
+    /* if no docstring given and the getter has one, use that one */
+    if ((doc == NULL || doc == Py_None) && get != NULL) {
+        PyObject *get_doc = PyObject_GetAttrString(get, "__doc__");
+        if (get_doc) {
+            if (Py_TYPE(self) == &PyProperty_Type) {
+                Py_XDECREF(prop->prop_doc);
+                prop->prop_doc = get_doc;
+            }
+            else {
+                /* If this is a property subclass, put __doc__
+                in dict of the subclass instance instead,
+                otherwise it gets shadowed by __doc__ in the
+                class's dict. */
+                int err = PyObject_SetAttrString(self, "__doc__", get_doc);
+                Py_DECREF(get_doc);
+                if (err < 0)
+                    return -1;
+            }
+            prop->getter_doc = 1;
+        }
+        else if (PyErr_ExceptionMatches(PyExc_Exception)) {
+            PyErr_Clear();
+        }
+        else {
+            return -1;
+        }
+    }
+
+    return 0;
+}
+
+PyDoc_STRVAR(property_doc,
+"property(fget=None, fset=None, fdel=None, doc=None) -> property attribute\n"
+"\n"
+"fget is a function to be used for getting an attribute value, and likewise\n"
+"fset is a function for setting, and fdel a function for del'ing, an\n"
+"attribute.  Typical use is to define a managed attribute x:\n\n"
+"class C(object):\n"
+"    def getx(self): return self._x\n"
+"    def setx(self, value): self._x = value\n"
+"    def delx(self): del self._x\n"
+"    x = property(getx, setx, delx, \"I'm the 'x' property.\")\n"
+"\n"
+"Decorators make defining new properties or modifying existing ones easy:\n\n"
+"class C(object):\n"
+"    @property\n"
+"    def x(self):\n"
+"        \"I am the 'x' property.\"\n"
+"        return self._x\n"
+"    @x.setter\n"
+"    def x(self, value):\n"
+"        self._x = value\n"
+"    @x.deleter\n"
+"    def x(self):\n"
+"        del self._x\n"
+);
+
+static int
+property_traverse(PyObject *self, visitproc visit, void *arg)
+{
+    propertyobject *pp = (propertyobject *)self;
+    Py_VISIT(pp->prop_get);
+    Py_VISIT(pp->prop_set);
+    Py_VISIT(pp->prop_del);
+    Py_VISIT(pp->prop_doc);
+    return 0;
+}
+
+PyTypeObject PyProperty_Type = {
+    PyVarObject_HEAD_INIT(&PyType_Type, 0)
+    "property",                                 /* tp_name */
+    sizeof(propertyobject),                     /* tp_basicsize */
+    0,                                          /* tp_itemsize */
+    /* methods */
+    property_dealloc,                           /* tp_dealloc */
+    0,                                          /* tp_print */
+    0,                                          /* tp_getattr */
+    0,                                          /* tp_setattr */
+    0,                                          /* tp_compare */
+    0,                                          /* tp_repr */
+    0,                                          /* tp_as_number */
+    0,                                          /* tp_as_sequence */
+    0,                                          /* tp_as_mapping */
+    0,                                          /* tp_hash */
+    0,                                          /* tp_call */
+    0,                                          /* tp_str */
+    PyObject_GenericGetAttr,                    /* tp_getattro */
+    0,                                          /* tp_setattro */
+    0,                                          /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
+        Py_TPFLAGS_BASETYPE,                    /* tp_flags */
+    property_doc,                               /* tp_doc */
+    property_traverse,                          /* tp_traverse */
+    0,                                          /* tp_clear */
+    0,                                          /* tp_richcompare */
+    0,                                          /* tp_weaklistoffset */
+    0,                                          /* tp_iter */
+    0,                                          /* tp_iternext */
+    property_methods,                           /* tp_methods */
+    property_members,                           /* tp_members */
+    0,                                          /* tp_getset */
+    0,                                          /* tp_base */
+    0,                                          /* tp_dict */
+    property_descr_get,                         /* tp_descr_get */
+    property_descr_set,                         /* tp_descr_set */
+    0,                                          /* tp_dictoffset */
+    property_init,                              /* tp_init */
+    PyType_GenericAlloc,                        /* tp_alloc */
+    PyType_GenericNew,                          /* tp_new */
+    PyObject_GC_Del,                            /* tp_free */
+};