def idxmin(self, axis=None, out=None, skipna=True):
        i = nanops.nanargmin(_values_from_object(self), skipna=skipna)
        if i == -1:
            return np.nan
        return self.index[i]
Index of first occurrence of minimum of values.
dataset/ETHPy150Open pydata/pandas/pandas/core/series.py/Series.idxmin