Why can't I get this task to work - where I seem to just need to swap the first item of a list in Python?

Here is the code in the challenge: full_name = "Bruce Martin Whealton"

name_list = full_name.split()

greeting_list = "Hi, I'm Treehouse".split()

swap_val = greeting_list[2]

name_list = swap_val + name_list

First I create full_name and that works fine. Then I convert it to a list by using full_name.split() That works fine. The next step is to create a greeting list using split, which splits on spaces from "Hi, I'm Treehouse" This works fine. Now the third step is where the problem arises. I thought it was simple, but the quote simple unquote first try by me, which seemed to be straight forward and easy turned out to be wrong.

The instruction reads: "Now, swap the value of "Treehouse" in greeting_list to be the first item in your name_list variable."
Originally, I did this in the Python interpreter and got what I thought was the right answer.
I didn't use swap_val or that line at all. I just did

name_list[0] = greeting_list[2]

Then inside the python interpreter I entered name_list and I got ['Treehouse', 'Martin', 'Whealton']

So, now Treehouse is the first item in the name_list variable which points to the new name_list that has swapped Treehouse for 'Bruce' But when I check my answer, it says that Task 1 now fails. Task 1 is where I set full_name to my full name and then use split and assign the resulting list to name_list. Maybe it is as simple as making a new variable for the new list.
Thanks, Bruce