Python: Sets

groceries = {'cereal', 'milk', 'starcrunch', 'beer', 'duckt tape', 'lotion', 'beer'}
print(groceries) #Huom! Beer näkyy vain kerran. Setsissä voi olla sama asia vain kerran.
if 'milk' in groceries:
    print('You already have milk.')
else:
    print('Oh yea, you need milk.')