python - Pandas - Dataframe.set_index - how to keep the old index column

Question

I have this Dataframe:

import pandas as pd
df = pd.DataFrame({\'Hugo\' : {\'age\' : 21, \'weight\' : 75},
                   \'Bertram\': {\'age\' :         


        

Answer 1

Change the drop variable to False.

df = df.set_index("age", drop=False)