# import necessary libraries
import pandas as pd
# create a sample df
df = pd.DataFrame({'A': [1, 2, 3],
'B': [4, 5, 6],
'C': [7, 8, 9]})
# use set_axis() method and change name 'A' & 'B'
df = df.set_axis(['NewA', 'NewB', 'C'], axis=1)
# print the result
print(df)