DataFrameGroupBy.idxmin()
pandas.core.groupby.DataFrameGroupBy.idxmin
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DataFrameGroupBy.idxmin(axis=0, skipna=True)
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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 : Se