Reordering pivot table headers

Question

I have the output to a pivot table which looks as follows

I would like the output to be reordered as shown below

Having looked at other similar posts, it's some kind of post processing on the pivot table. I have tried pd.swap_levels(0, 1, axis=1) but it does not give the correct results. Note I also want to reverse the order of the weeks so that it becomes 4 to 1.

Can anyone help with the required syntax to get the desired outcome?

Answer 1

First, swaplevel then sort_index in descending order but use sort_remaining=False to maintain the other level order:

# Output
>>> df.swaplevel(axis=1).sort_index(axis=1, level=0, ascending=False, sort_remaining=False)

Weeknum    4            3            2            1        
        Late Neg Pos Late Neg Pos Late Neg Pos Late Neg Pos
0          D   H   L    C   G   K    B   F   J    A   E   I

# Input
>>> df
        Late          Neg          Pos         
Weeknum    1  2  3  4   1  2  3  4   1  2  3  4
0          A  B  C  D   E  F  G  H   I  J  K  L