[issue21823] Catch turtle.Terminator exceptions in turtledemo

[Terry J. Reedy]

Terry J. Reedy added the comment:

Since hanoi do not have user interaction, once started, it does not need to be 'special'. Like planets_and_moon, it could run until done and then return 'Done'.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21823>
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