[issue6639] turtle: _tkinter.TclError: invalid command name ".10170160"

[Lita Cho]

Lita Cho added the comment:

Oops, pressed submit too soon.

Now the programs raise a Terminator exception rather than a TclError, which I think is correct because the programs are calling Turtle methods when the TurtleScreen had been destroyed. 

I wasn't sure if it was better to return None rather than raise an exception, but I think raising exception is correct, as these programs are not calling mainloop to handle event loops. So when the user closes the window, round_dance.py should handle that.

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<http://bugs.python.org/issue6639>
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