pip install fn python from fn import _ # Map squared_numbers = list(map(_ * 2, [1, 2, 3, 4])) # Filter even_numbers = list(filter(_ % 2 == 0, [1, 2, 3, 4, 5, 6])) # Reduce from fn.func import reduce sum_of_numbers = reduce(_ + _, [1, 2, 3, 4, 5]) # Compose add_one_then_square = _.add(1).then(_ ** 2) result = add_one_then_square(3)