pandas.Series.swaplevel
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Series.swaplevel(i=-2, j=-1, copy=True)[source]
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Swap levels i and j in a MultiIndex Parameters: i, j : int, string (can be mixed) Level of index to be swapped. Can pass level name as string. Returns: swapped : Series Changed in version 0.18.1: The indexes iandjare now optional, and default to the two innermost levels of the index.
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Licensed under the 3-clause BSD License.
    https://pandas.pydata.org/pandas-docs/version/0.20.3/generated/pandas.Series.swaplevel.html