how to change a column name in a dataframe in python code example

Example 1: df reanme columns

df_org = df.copy()
df_org.rename(columns={'A': 'a'}, index={'ONE': 'one'}, inplace=True)
print(df_org)
#         a   B   C
# one    11  12  13
# TWO    21  22  23
# THREE  31  32  33

Example 2: rename dataframe index column pandas

df.index.names = ['new_name']