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Add parameter defaults for swaplevel #12934

brandon-rhodes opened this Issue Apr 20, 2016 · 1 comment


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brandon-rhodes commented Apr 20, 2016

I will be happy to write up a pull request, but first wanted to gauge the sanity of my suggestion:

I think that swaplevel() deserves default values for its parameters, just like its friends like stack() and unstack() and sortlevel() that also all take an initial level argument. I suggest:

def swaplevel(self, i=-2, j=-1, axis=0):

This provides the greatest symmetry with the other methods that operate on levels: they all, if no level is specified, operate on the innermost level as their default.

In the very common case where there are only two levels to the multi-index anyway, this would reduce this frequent operation to simply .swaplevel() or .swaplevel(axis='columns') without, I don't think, any more loss of readability than when stack() or unstack() fail to specify the level upon which they are operating.


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jreback Apr 20, 2016


@brandon-rhodes yes this does seem ok


jreback commented Apr 20, 2016

@brandon-rhodes yes this does seem ok

@jreback jreback added this to the Next Major Release milestone Apr 20, 2016

@jreback jreback closed this in ed324e8 Apr 22, 2016

@jreback jreback modified the milestones: 0.18.1, Next Major Release Apr 22, 2016

nps added a commit to nps/pandas that referenced this issue May 17, 2016

Add defaults to swaplevel() parameters i and j
Closes pandas-dev#12934 feature request.

Author: Brandon Rhodes <>

Closes pandas-dev#12943 from brandon-rhodes/master and squashes the following commits:

c6fbb3e [Brandon Rhodes] Add default values to swaplevel() i, j parameters
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