1df_new = df.rename(columns={'A': 'a'}, index={'ONE': 'one'})
2print(df_new)
3# a B C
4# one 11 12 13
5# TWO 21 22 23
6# THREE 31 32 33
7
8print(df)
9# A B C
10# ONE 11 12 13
11# TWO 21 22 23
12# THREE 31 32 33
13