pandas.core.groupby.DataFrameGroupBy.idxmin  
DataFrameGroupBy.idxmin  
Return index of first occurrence of minimum over requested axis. NA/null values are excluded.    
Parameters:

axis : {0 or ‘index’, 1 or ‘columns’}, default 0 0 or ‘index’ for row-wise, 1 or ‘columns’ for column-wise skipna : boolean, default True Exclude NA/null values. If an entire row/column is NA, the result will be NA.   
Returns:

idxmin : Series   
Raises:

ValueError  If the row/column is empty      See also Series.idxmin  Notes This method is the DataFrame version of ndarray.argmin. 


    
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