Rename pandas dataframe columns whose type is RangeIndex [duplicate]

Question

I have a dataframe whose columns are RangeIndex. I want to change the names.

import pandas as pd
>>> my_df

            0         1
Alpha    -0.1234     0.001
Beta     0.7890      0.005

>>> my_df.columns
RangeIndex(start=0, stop=2, step=1)

I want to do something like:

 my_df = my_df.rename({'0': 'Betas', '1': 'P-values})

And it should look like:

>>> my_df

            Betas         P-values
Alpha    -0.1234     0.001
Beta     0.7890      0.005

But it does not change the column names.

Answer 1

Simple and straightforward.

my_df.rename(columns = { '0': 'Betas', '1': 'P-values' }, inplace=True)

Even nicer as borrowed from Edchum

my_df.columns = ['Betas', 'P-values']