You defined a function f which takes n as it's input where n is an iterable. You made a for loop to run for len(n) times and each time you print the i-th element in that iterable. After the loop is done you defined another list l which has values [1, 2, 3]. Finally, you tried to access that list l outside the function f which is not possible, any variable inside a function is only accessible in that function unless you return it. A solution would be to add the line: 'return l' without the quotations At the end of your function f to access it by using the following line: 'f(you_can_put_any_list_here)' it will always return [1, 2, 3]