获取沪深300指数成分股代码

sample = get_index_stocks('000300.SH', '20150105')
sample

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NameError Traceback (most recent call last)
in ()
1 # 获取沪深300指数成分股代码
----> 2 sample = get_index_stocks('000300.SH', '20150105')
3 sample

NameError: name 'get_index_stocks' is not defined

MindGo的函数今天突然不能用了？？？