python IDLE shell appears not to handle some escapes correctly

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What am I doing wrong or what should I be looking for?
Is it reasonable to expect backspace, specifically, to work?

No, IDLE does not support backspace, nor carriage-return, nor formfeed, nor ANSI escape sequences.

You are expecting \b to move the cursor one cell to the left in IDLE’s interactive shell window. It doesn’t do that. IDLE does not support cursor addressing in its shell window, with the exception of newline and tab.

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