pandas.Series.argmin  
Series.argmin(axis=None, skipna=True, *args, **kwargs)  
Index of first occurrence of minimum of values.    
Parameters:

skipna : boolean, default True Exclude NA/null values   
Returns:

idxmin : Index of minimum of values     See also DataFrame.idxmin, numpy.ndarray.argmin  Notes This method is the Series version of ndarray.argmin. 


    
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