__del__ in classes derived from Tkinter classes

[Petr Klyushkin]

Hello!

I'm a Python and Tkinter newbie.  I've noticed that __del__ methods of
my classes derived from Tkinter classes are never called.  Is this
normal behavior, or I am doing something wrong?

Example code:

import Tkinter

class Test(Tkinter.Toplevel):
  def __del__(self):
    print 'hey!'

tk = Tkinter.Tk()
test = Test(tk)

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