Function check_seekable

crates/vm/src/stdlib/_io.rs:391–400

(file: &PyObject, vm: &VirtualMachine)

    }

    fn check_seekable(file: &PyObject, vm: &VirtualMachine) -> PyResult<()> {
        if vm.call_method(file, "seekable", ())?.try_to_bool(vm)? {
            Ok(())
        } else {
            Err(new_unsupported_operation(
                vm,
                "File or stream is not seekable".to_owned(),
            ))
        }
    }

    fn check_decoded(decoded: PyObjectRef, vm: &VirtualMachine) -> PyResult<PyStrRef> {
        decoded.downcast().map_err(|obj| {