inspect the index and multiple indexes in Python

index = cars.index

index.has_duplicates # return True or False

index.value_counts() # can see the most frequent value

#########################################
titanic.loc[1] # only by first index
titanic.loc[(slice(None), slice('female')), :] # only by second index
titanic.loc[(slice(1), slice('female')), :]
titanic.loc[(1,'female'), 'age')]
titanic.loc[([1,2],'female'), 'age')]

titanic.swaplevel().sort_index() # swap the indexes and sort

titanic.reset_index()

#########################################
cars.set_index(["model_year", "origin"]).sort_index(ascending = [True, True])