'the nested renamer error' 如何从这个 jupyter notebook 解决

How can 'the nested renamer error' be solved from this jupyter notebook

我正在尝试为 class 复制下一个 notebook，特别是 Input [32]

行 
In[32] bin_stats = joined.groupby('bins_index')['offset'].agg({'fold': len, 'min_offset': np.min})

但我收到错误 SpecificationError: nested renamer is not supported

您可以使用 named aggregation:

bin_stats = (joined.groupby('bins_index')
                   .agg(fold = ('offset', len), 
                        min_offset = ('offset', np.min)))