Python 2.7 Tkinter question

Consider a Python GUI program that produces a window with the following widgets: a text box to display the value of one element of a given list (e.g., a list of the five vowels: a button to retrieve the previous value in that list (if there is one). This button is disabled if there is no previous value in the list a button to retrieve the next value in that list (if there is one). This button is disabled if there is no next value in the list. a label to display the number of the item being displayed and the total number of items (e.g., "1/5") The initial output is as shown below: 76 Vowels prev next 1/5 Hitting the next" button once (from the initial state above) produces the following output: 74 Vowels prev next 2/5