怎么获取历史数据?
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import dai
from bigmodule import M
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#获取数据
start_date="2012-02-01"
end_date="2017-07-18"
instruments=["000069.sza","002337.sza","000333.sza","000338.sza","000100.sza"]
data=M.get_history_data(instruments,start_date,end_date,fields=['close'])
print(data.head())
这个代码无法运作,请问到底错在哪儿?