Create PriceData filter list from all args passed as True.
    :param bool sp_available: Amount available for the BSP auction.
    :param bool sp_traded: Amount traded in the BSP auction.
    :param bool ex_best_offers: Only the best prices available for each runner, to requested price depth.
    :param bool ex_all_offers: trumps EX_BEST_OFFERS if both settings are present
    :param bool ex_traded: Amount traded on the exchange.

    :returns: string values of all args specified as True.
    :rtype: list

def price_data(sp_available=False, sp_traded=False, ex_best_offers=False, ex_all_offers=False, ex_traded=False):
    """
    Create PriceData filter list from all args passed as True.
    :param bool sp_available: Amount available for the BSP auction.
    :param bool sp_traded: Amount traded in the BSP auction.
    :param bool ex_best_offers: Only the best prices available for each runner, to requested price depth.
    :param bool ex_all_offers: trumps EX_BEST_OFFERS if both settings are present
    :param bool ex_traded: Amount traded on the exchange.

    :returns: string values of all args specified as True.
    :rtype: list
    """
    args = locals()
    return [
        k.upper() for k, v in args.items() if v is True
    ]