from Tkinter import * class App: def __init__(self, master): fm = Frame(master) Button(fm, text='Left').pack(side=TOP) Button(fm, text='Center').pack(side=LEFT) Button(fm, text='Right').pack(side=LEFT) fm.pack() root = Tk() root.option_add('*font', ('verdana', 12, 'bold')) root.title("Pack - Example 3") display = App(root) root.mainloop()