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I have a pandas dataframe with multi-index column headers that looks like this:

enter image description here

I would like it to look like this:

enter image description here

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2 Answers 2

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Try stack and swaplevel:

>>> df
            A        B      
            1  2  3  1  2  3
11/12/2021  1  2  3  4  5  6

>>> df.stack(level=0).swaplevel()
              1  2  3
A 11/12/2021  1  2  3
B 11/12/2021  4  5  6
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df = df.unstack(level=0).unstack(level=1)

output:

                 1     2     3
A 2021-12-11  52.3  64.9  86.8
B 2021-12-11  32.3  12.6  14.7
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