[Tkinter] Trying to add data into a shelf from a submit button

[TWB]

My goal was to take a program that I have already written in a command line format and convert it to a GUI. It takes input for student names and grades and stores them in a shelf. I can use that For loop and it will print out all the names that were entered and their scores. I also have it so I can search on students names. I can also open up the .dir file and see the names as they are the Keys. It all works in the command line just not working on the GUI conversion to that point of the program. As Im new to Python it was just a exercise of interest.
Thanks for your direction though, it was helpful