'field' is both an index level and a column label, which is ambiguous. 错误 , 需要重建 index
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pandas0.23.1 以后版本,在pandas.merge或其它方法中会报 'field' is both an index level and a column label, which is ambiguous. 错误 , 需要重建 index subfrm1 = subfrm1.reset_index(drop=True)