DataFrameの列名変更

[pandas.DataFrameの行名・列名の変更

note.nkmk.me](https://note.nkmk.me/python-pandas-dataframe-rename/)

print(df.rename(columns={'A': 'Col_1', 'C': 'Col_3'}))
#        Col_1   B  Col_3
# ONE       11  12     13
# TWO       21  22     23
# THREE     31  32     33