```instruments = ['510030.HOF'] # 标的:HS300 ETF
capital_base = 100000
history_data = D.history_data(instruments, '2012-06-01', end_date, fields=['open','close'])
print(history_data)
在运行时,history_data中没有数据显示,print出的结果是None
沪深300ETF的后缀不对
m15567441124
(m15567441124)
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