[issue14117] Turtledemo: exception and minor glitches.

[Terry J. Reedy]

Terry J. Reedy added the comment:

21884 removed or moved global system-changing or gui calls to main. Wrapping two_canvases code (except for window preserving mainloop) to a new main fixed its problems.

Should remove reload from main driver, and test.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14117>
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