def warning(parent, title, description):

    """Creates future with QMessageBox. Enables use of QMessageBox with

    asyncqt/asyncio. Mimics QMessageBox.warning behaviour - but QMessageBox

    cannot be used, as it blocks Qt loops from executing (as all modal dialogs

    does).

    Parameters

    ----------

    parent : `QtWidget`

        Parent widget.

    title : `str`

        Message window title.

    description : `str`

        Descrption of warning occured.

    """

    future = asyncio.Future()

    dialog = QMessageBox(parent)

    dialog.setWindowTitle(title)

    dialog.setText(description)

    dialog.setIcon(QMessageBox.Warning)

    dialog.finished.connect(lambda r: future.set_result(r))

    dialog.open()

    return future