Method flush

crates/vm/src/stdlib/_io.rs:464–467

(instance: PyObjectRef, vm: &VirtualMachine)

        #[pymethod]
        fn flush(instance: PyObjectRef, vm: &VirtualMachine) -> PyResult<()> {
            // just check if this is closed; if it isn't, do nothing
            check_closed(&instance, vm)
        }

        #[pymethod]
        fn seekable(_self: PyObjectRef) -> bool {