Python: Append Values as Prefix or Suffix to a Set Elements

If you have a set and you want to append a prefix or a suffix to each element of that set then you can make use of the set comprehension in Python.

cities = {"New York", "London", "Paris", "Tokyo", "Sydney", "Nairobi", "Dubai"}

welcome_cities = {"Welcome to " + city for city in cities}

for city_greeting in welcome_cities:
    print(city_greeting)

prices = {1.99, 5.49, 7.25, 12.50, 3.75}

prices_with_dollar = {"$" + str(price) for price in prices}

print(prices_with_dollar)