18. 6. 2. Check buttons, the hard way (without variables)
from Tkinter import *
states = []
def onPress(i):
states[i] = not states[i]
root = Tk() for i in range(10):
chk = Checkbutton(root, text=str(i), command=(lambda i=i: onPress(i)) )
chk.pack(side=LEFT)
states.append(0)
root.mainloop()
print states