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How to change the order of DataFrame columns?

I have the following DataFrame (df):

import numpy as np
import pandas as pd

df = pd.DataFrame(np.random.rand(10, 5))

I add more column(s) by assignment:

df['mean'] = df.mean(1)

How can I move the column mean to the front, i.e. set it as first column leaving the order of the other columns untouched?

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8

This was a nice solution, but reindex_axis will be deprecated. I used reindex, and it worked just fine.
– Jorge
Commented Aug 8, 2018 at 21:32
I may miss something but 1/ you likely forgot to include axis=1 in this second solution to use the columns, not the rows. 2/ In 2020, the reindex solution changes the rows/columns order, but also clears data (NaN everywhere).
– mins
Commented Dec 15, 2020 at 10:30

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How to change the order of DataFrame columns?

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