Function pyo3_get_value_into_pyobject_ref 

unsafe fn pyo3_get_value_into_pyobject_ref<ClassT, FieldT, const OFFSET: usize>(
    py: Python<'_>,
    obj: NonNull<PyObject>,
) -> PyResult<*mut PyObject>
where
    ClassT: PyClass,
    for<'a, 'py> &'a FieldT: IntoPyObject<'py>,

Gets a field value from a pyclass and produces a python value using IntoPyObject for &FieldT

Safety

• obj must be a valid pointer to an instance of ClassT
• there must be a value of type FieldT at the calculated offset within ClassT