df.rename({0: 'links'}, axis=1, inplace=True)
df.columns = ['V', 'W', 'X', 'Y', 'Z']
# 20. Rename a column
df.rename(columns={"Airline": "Airline_Code", "AirportFrom":"Airport_From"})
df.rename(columns={"Airline": "Airline_Code", "AirportFrom":"Airport_From"})