cudf.DataFrame.swaplevel

DataFrame.swaplevel(i=-2, j=-1, axis=0)

Swap level i with level j. Calling this method does not change the ordering of the values.

Parameters

iint or str, default -2

First level of index to be swapped.

jint or str, default -1

Second level of index to be swapped.

axisThe axis to swap levels on.

0 or ‘index’ for row-wise, 1 or ‘columns’ for column-wise.

Examples

>>> import cudf
>>> midx = cudf.MultiIndex(levels=[['llama', 'cow', 'falcon'],
...   ['speed', 'weight', 'length'],['first','second']],
...   codes=[[0, 0, 0, 1, 1, 1, 2, 2, 2], [0, 1, 2, 0, 1, 2, 0, 1, 2],
...             [0, 0, 0, 0, 0, 0, 1, 1, 1]])
>>> cdf = cudf.DataFrame(index=midx, columns=['big', 'small'],
...  data=[[45, 30], [200, 100], [1.5, 1], [30, 20],
...         [250, 150], [1.5, 0.8], [320, 250], [1, 0.8], [0.3, 0.2]])

>>> cdf
                             big  small
     llama  speed  first    45.0   30.0
            weight first   200.0  100.0
            length first     1.5    1.0
     cow    speed  first    30.0   20.0
            weight first   250.0  150.0
            length first     1.5    0.8
     falcon speed  second  320.0  250.0
            weight second    1.0    0.8
            length second    0.3    0.2

>>> cdf.swaplevel()
                             big  small
     llama  first  speed    45.0   30.0
                   weight  200.0  100.0
                   length    1.5    1.0
     cow    first  speed    30.0   20.0
                   weight  250.0  150.0
                   length    1.5    0.8
     falcon second speed   320.0  250.0
                   weight    1.0    0.8
                   length    0.3    0.2