Dictionary and tuple practice

cities = {(32.7157, 117.1611): 'San Diego', (37.7749, 122.4194): 'San Francisco',
          (40.7128, 74.006): 'New York', (30.2672, 97.7431): 'Austin'}

coordinates = {'San Diego': (32.7157, 117.1611), 'San Francisco': (37.7749, 122.4194),
               'New York': (40.7128, 74.006), 'Austin': (30.2672, 97.7431)}