[issue40056] more user-friendly turtledemo

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

I will look at the two changes separately.  Spaces could be backported, but since they are not really typos, there is no real need to.  I will compare td for master and 3.9 to compare appearance.

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<https://bugs.python.org/issue40056>
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