main.py

#!/usr/bin/env python3

import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk

class MyWindow(Gtk.Window):

    def __init__(self):
        Gtk.Window.__init__(self, title="The Bazaar")
        self.box = Gtk.Box(spacing = 10)
        self.button1 = Gtk.Button(label="Notre Dame Specific")
        self.button1.connect("clicked", self.on_button1_clicked)
        self.box.pack_start(self.button1, True, True, 0)

        self.button2 = Gtk.Button(label="Other Software")
        self.button2.connect("clicked", self.on_button2_clicked)
        self.box.pack_start(self.button2, True, True, 0)

        self.add(self.box)
        self.set_default_size(800,600)


    def on_button1_clicked(self, widget):
        print("Button 1")

    def on_button2_clicked(self, widget):
        print("Button 2")
win = MyWindow()
win.connect("destroy", Gtk.main_quit)
win.show_all()
Gtk.main()