def _Real(parser, propObj, propCls, propName, propHelp, shortArg, longArg):
    """Adds an argument to the given parser for the given :class:`.Real`
    property. See the :func:`_String` documentation for details on the
    parameters.
    """
    parser.add_argument(shortArg, longArg, help=propHelp, metavar='REAL',
        type=float)
