>>> k = ['hi','boss'] >>> >>> k ['hi', 'boss'] >>> k= [s.upper for s in k] >>> k [<built-in method upper of str object at 0x00000000021B2AF8>, <built-in method upper of str object at 0x0000000002283F58>] Why doesn't the python interpreter just return ['HI, 'BOSS'] ? This isn't a big deal, but I am just curious as to why it does this.