% cat gui3.py
from Tkinter import *
from gui2 import Stooges


class Sub(Stooges):
    def __init__(self, parent=None):
        Stooges.__init__(self, parent)
        Label(self, text="Stooges meet GUIs!").pack()

if __name__ == '__main__': Sub().mainloop()


% python gui3.py
zoiks
boink
ouch