You might want to take a look at,
https://github.com/sympy/sympy/issues/7194
It's pretty simple to fix (or verify that it's already fixed) and I
don't see a pull request covering it at the moment. Plus, it gets you
familiar with the printing system and there's other bugs in it that
could be fixed. Printing is often a low priority.
Cheers,
Tim.
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Tim Lahey, Ph.D.