Shin-Myoung-Serp added the comment:
I tested on Ubuntu 20.04 with the following Python versions.
3.8.2(repository version)
3.11.0a5(compiled from the official tarball)
Both cases cause flickering.
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New submission from Shin-Myoung-Serp :
When implementing an animation with turtle, usually the tracer is turned off
via turtle.tracer(0, 0) and turtle.update() is called manually.
When the tracer is off, most of drawing functions skips update() calls on the
underlying Canvas. But
