how to make a custom python object?

[elsejj]

i want make a new object named 'vector' to my python release, 
the 'vector' is most like a 'list', but have some number operatioins 
such as add, sub, ect. i create the head file vectorobject.h based 
on listobject.h, i create the src file vectorobject.c based on 
listobject.c and intobject.c.
1  i had create PyVectorObject like this
   typedef struct {
	PyObject_VAR_HEAD
	double* ob_item;
} PyVectorObject;

2  i had create the PyVector_Type like this
PyAPI_DATA(PyTypeObject);
and initialize it in vectorobject.c like
PyTypeObject PyVector_Type = {
	PyObject_HEAD_INIT(&PyType_Type)
	0,
	"vector",
	sizeof(PyVectorObject),
	0,
	(destructor)vector_dealloc,		/* tp_dealloc */
	(printfunc)vector_print,			/* tp_print */
	0,					/* tp_getattr 
*/
	0,					/* tp_setattr 
*/
	0,			/* tp_compare */
	0,			/* tp_repr */
	&vector_as_number,				/* 
tp_as_number */
	0,					/* 
tp_as_sequence */
	0,					/* 
tp_as_mapping */
...

but it dosen't works, i can't declare the object and used it, who 
can tell me how to do, thanks very much.