% cat gui2.py
from Tkinter import *
def message(x): print x
Button(text='Curly', command=lambda:message('zoiks')).pack()
Button(text='Moe',   command=lambda:message('boink')).pack()
Button(text='Larry', command=lambda:message('ouch')).pack()
mainloop()

% python gui2.py
zoiks
boink
ouch