:param list fields: EX_BEST_OFFERS_DISP, EX_BEST_OFFERS, EX_ALL_OFFERS, EX_TRADED,
    EX_TRADED_VOL, EX_LTP, EX_MARKET_DEF, SP_TRADED, SP_PROJECTED
    :param int ladder_levels: 1->10

    :return: dict

def streaming_market_data_filter(fields=None, ladder_levels=None):
    """
    :param list fields: EX_BEST_OFFERS_DISP, EX_BEST_OFFERS, EX_ALL_OFFERS, EX_TRADED,
    EX_TRADED_VOL, EX_LTP, EX_MARKET_DEF, SP_TRADED, SP_PROJECTED
    :param int ladder_levels: 1->10

    :return: dict
    """
    args = locals()
    return {
        to_camel_case(k): v for k, v in args.items() if v is not None
    }