pandas.Series.sort_index
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Series.sort_index(axis=0, level=None, ascending=True, inplace=False, kind='quicksort', na_position='last', sort_remaining=True)[source]
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Sort object by labels (along an axis) Parameters: axis : index to direct sorting level : int or level name or list of ints or list of level names if not None, sort on values in specified index level(s) ascending : boolean, default True Sort ascending vs. descending inplace : bool, default False if True, perform operation in-place kind : {‘quicksort’, ‘mergesort’, ‘heapsort’}, default ‘quicksort’ Choice of sorting algorithm. See also ndarray.np.sort for more information. mergesortis the only stable algorithm. For DataFrames, this option is only applied when sorting on a single column or label.na_position : {‘first’, ‘last’}, default ‘last’ firstputs NaNs at the beginning,lastputs NaNs at the end. Not implemented for MultiIndex.sort_remaining : bool, default True if true and sorting by level and index is multilevel, sort by other levels too (in order) after sorting by specified level Returns: sorted_obj : Series 
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    https://pandas.pydata.org/pandas-docs/version/0.20.3/generated/pandas.Series.sort_index.html