I, for my part, prefer the latter solution (b). Example: a student, having (interactively) produced some design using some turtle t = Turtle() decides spontaneously to change backgroundcolor. s = Screen(); s.bgcolor("pink") should do this for her -
My perhaps naive view is that students should be given name S bound to the single Screen object and not have direct access to the Screen class object to ever call it. S.bgcolor should be all that they need to do.
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