How to use the forbiddenfruit.__init__.PyObject._fields_ function in forbiddenfruit

('sq_contains', ObjObjProc_p),
        ('sq_inplace_concat', BinaryFunc_p),
        ('sq_inplace_repeat', SSizeArgFunc_p),
    ]

class PyMappingMethods(ctypes.Structure):
    pass

class PyTypeObject(ctypes.Structure):
    pass

class PyAsyncMethods(ctypes.Structure):
    pass


PyObject._fields_ = [
    ('ob_refcnt', Py_ssize_t),
    ('ob_type', ctypes.POINTER(PyTypeObject)),
]

PyTypeObject._fields_ = [
    # varhead
    ('ob_base', PyObject),
    ('ob_size', Py_ssize_t),
    # declaration
    ('tp_name', ctypes.c_char_p),
    ('tp_basicsize', Py_ssize_t),
    ('tp_itemsize', Py_ssize_t),
    ('tp_dealloc', ctypes.CFUNCTYPE(None, PyObject_p)),
    ('printfunc', ctypes.CFUNCTYPE(ctypes.c_int, PyObject_p, FILE_p, ctypes.c_int)),
    ('getattrfunc', ctypes.CFUNCTYPE(PyObject_p, PyObject_p, ctypes.c_char_p)),
    ('setattrfunc', ctypes.CFUNCTYPE(ctypes.c_int, PyObject_p, ctypes.c_char_p, PyObject_p)),