pandas.Series.reorder_levels
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Series.reorder_levels(order)[source]
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Rearrange index levels using input order. May not drop or duplicate levels Parameters: order : list of int representing new level order. (reference level by number or key) axis : where to reorder levels Returns: type of caller (new object) 
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Licensed under the 3-clause BSD License.
    https://pandas.pydata.org/pandas-docs/version/0.20.3/generated/pandas.Series.reorder_levels.html