Instruction
Perfect! We can also use sets to store the unique values of a characteristic computed from the elements of a given list. Take a look:
cities = ['London', 'Madrid', 'Milan', 'Bordeaux', 'Milan', 'London', 'Lisbon', 'London'] first_letters = set() for city in cities: first_letters.add(city[0])
In the example above, we want to find all the unique first letters for the elements in the list. Inside a loop, we simply add the first letter of each city to the first_letters set. Because sets only hold unique values, duplicates will be ignored when we invoke first_letters.add(city[0]).
Exercise
We want to manufacture key rings with the car makes found in the people_cars dictionary. The size of each key ring will depend on the number of letters in the car make name. Create the set named car_make_lengths and add all unique car make length values to it. Then, print the following sentence:
There will be {x} different sizes of key rings.Stuck? Here's a hint!
Iterate over all the values in the dictionary with people_cars.values() and add len(value) to your set.
To get the size of the set, use the len() function.
