Method __enter__

crates/vm/src/stdlib/_io.rs:452–455

(instance: PyObjectRef, vm: &VirtualMachine)

        #[pymethod]
        fn __enter__(instance: PyObjectRef, vm: &VirtualMachine) -> PyResult {
            check_closed(&instance, vm)?;
            Ok(instance)
        }

        #[pymethod]
        fn __exit__(instance: PyObjectRef, _args: FuncArgs, vm: &VirtualMachine) -> PyResult<()> {