Emanuel Barry <ba...@dadadata.net> added the comment:

This is a known issue, and is properly explained here: 
https://docs.python.org/3/faq/programming.html#why-does-a-tuple-i-item-raise-an-exception-when-the-addition-works

----------
nosy: +ebarry
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue31952>
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