Write a function for the Pandas dataframe that will delete the lines with the names spi_rank and country

import pandas as pd
# Create DataFrame
df = pd.DataFrame({'spi_rank' : [21,19,20], 'country': ['Australia', 'Canada', 'Chile']})

def function(df):
  del df['spi_rank']
  del df['country']
  return df

function(df)