pd.IndexSlice[idx_slc]出错时，会提示清理redis的缓存
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Since Feb 1, 2021.
bug
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- Python
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Description
qlib\data\dataset\utils.py
fetch_df_by_index
return df.loc[
pd.IndexSlice[idx_slc],
]
win10系统，
fetch_df_by_index函数中的pd.IndexSlice[idx_slc]出错时，
会提示清理redis的数据;
错误应该和redis没有关系，
此处可能需要兼容一下此处异常。
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