get_kline_serial 返回对象值 open,close,high,low 都是一个

并没有像文档中说的起始于结束的值;

• open: 51450.0 (K线起始时刻的最新价)
• high: 51450.0 (K线时间范围内的最高价)
• low: 51450.0 (K线时间范围内的最低价)
• close: 51450.0 (K线结束时刻的最新价)
• volume: 11 (K线时间范围内的成交量)
• open_oi: 27354 (K线起始时刻的持仓量)
• close_oi: 27355 (K线结束时刻的持仓量)

from datetime import date, time, datetime;
from tqsdk import TqApi, TqSim, TqBacktest, BacktestFinished, TargetPosTask;
from tqsdk import tafunc;
 acc = TqSim();
api = TqApi(acc, backtest=TqBacktest(start_dt=datetime(2020, 4, 17, 9, 0), end_dt=datetime(2020, 4, 17, 9, 9)));
klines = api.get_kline_serial("SHFE.ru2009", 3 * 60);
 while True:
    api.wait_update();
    if (api.is_changing(klines.iloc[-1], "datetime")):
        print(klines.iloc[-1]);
 api.close();