[Tkinter] Link text field to separate python file

[Larz60+]

Do not post code as you did. I added code tags in the proper manner.

The gui code should use a get user button that is bound to the retrieve function
this can be done in the command argument of the button instance or with a separate
bind statement attached to the button. In either case, you will have to provide an event hook
as an argument in retrieve.