Function setattr

crates/vm/src/stdlib/builtins.rs:1071–1085

(
        obj: PyObjectRef,
        attr: PyObjectRef,
        value: PyObjectRef,
        vm: &VirtualMachine,
    )

    #[pyfunction]
    fn setattr(
        obj: PyObjectRef,
        attr: PyObjectRef,
        value: PyObjectRef,
        vm: &VirtualMachine,
    ) -> PyResult<()> {
        let attr = attr.try_to_ref::<PyStr>(vm).map_err(|_e| {
            vm.new_type_error(format!(
                "attribute name must be string, not '{}'",
                attr.class().name()
            ))
        })?;
        obj.set_attr(attr, value, vm)?;
        Ok(())
    }

    // builtin_slice