rearrange a dataframe according to a column code example

Example 1: how to change the column order in pandas dataframe

df = df.reindex(columns=column_names)

Example 2: rearrange columns pandas

You could also do something like this:

df = df[['mean', '0', '1', '2', '3']]
You can get the list of columns with:

cols = list(df.columns.values)
The output will produce:

['0', '1', '2', '3', 'mean']