Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

> This sounds like macOS's new "Prefer tabs when opening
> documents" system preference, which breaks IDLE in various 
> ways; see issue34864.  It should be disabled when using IDLE.

Thanks for the link.  I couldn't figure out what was happening with the 
student's computer and why it only happened to one person.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue35196>
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