# radio buttons, the hard way (without variables)
# note that deselect for radio buttons simply sets the button's
# associated value to a null string, so we either need to still
# give buttons unique values, or use checkbuttons here instead;

from Tkinter import *      
state = ''
buttons = []

def onPress(i):
    global state
    state = i
    for btn in buttons:
        btn.deselect()
    buttons[i].select()

root = Tk()
for i in range(10):
    rad = Radiobutton(root, text=str(i), 
                            value=str(i), command=(lambda i=i: onPress(i)) )
    rad.pack(side=LEFT)
    buttons.append(rad)
root.mainloop()
print state               # show state on exit