[issue13349] Non-informative error message in index() and remove() functions

[Sean Ochoa]

Sean Ochoa added the comment:

>From Taggnostr on #python-dev:  

1.) Use assertRaises+assertIn instead of assertRaisesRegex
2.) Add or change an existing test that you've already updated to use  elements with a repr longer than 100 chars.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13349>
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