pandas.Panel4D.swaplevel
- 
Panel4D.swaplevel(i=-2, j=-1, axis=0)[source] - 
Swap levels i and j in a MultiIndex on a particular axis
Parameters: i, j : int, string (can be mixed)
Level of index to be swapped. Can pass level name as string.
Returns: swapped : type of caller (new object)
Changed in version 0.18.1: The indexes
iandjare now optional, and default to the two innermost levels of the index. 
    © 2008–2012, AQR Capital Management, LLC, Lambda Foundry, Inc. and PyData Development Team
Licensed under the 3-clause BSD License.
    https://pandas.pydata.org/pandas-docs/version/0.19.2/generated/pandas.Panel4D.swaplevel.html