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

[TWB]

I again appreciate the help
I added a for loop to print out the values in the shelf and it seems to over write the files previous data. If I enter numerous input it will only I assume store the last entry. The for loop seen in the below code:

 
#print shelf
            print("the values of the shef are ", list(db.values()))
            print("the keys of the shef are ", list(db.keys()))
            for key, value in db.items():
                print(key, ' : ', value)   

Ive tried a few different options but it still only returns the last imputed value. I opened the .dir file and it also shows one line even though numerous were entered..
thanks again