请教回测时，为什么quote数据在两天时间里才更新了570次呀？不是一秒更新两次么？
#!/usr/bin/env python
# -*- coding: utf-8 -*-
from datetime import datetime,date
from tqsdk import TqApi,TqSim,TqBacktest,BacktestFinished, TargetPosTask
api=TqApi(TqSim(), backtest=TqBacktest(start_dt=date(2020, 5, 6), end_dt=date(2020, 5, 7)))
SYMBOL = "SHFE.rb2010" #
CLOSE_HOUR, CLOSE_MINUTE = 14, 50 # 平仓时间
target_pos = TargetPosTask(api, SYMBOL)
quote = api.get_quote(SYMBOL)
iii=0
print("策略开始运行")
while True:
api.wait_update()
if api.is_changing(quote, "datetime"):
iii=iii+1
print(iii)
now = datetime.strptime(quote.datetime, "%Y-%m-%d %H:%M:%S.%f")
print(now)
if now.hour == CLOSE_HOUR and now.minute >= CLOSE_MINUTE: #
print("临近本交易日收盘: 平仓")
target_pos.set_target_volume(0)
