[issue22053] turtledemo: clean up start and stop, fix warning

[Roundup Robot]

Roundup Robot added the comment:

New changeset 5aa3f4863dda by Terry Jan Reedy in branch '3.4':
#22053: actually remove .txt files from 3.4.
http://hg.python.org/cpython/rev/5aa3f4863dda

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<http://bugs.python.org/issue22053>
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