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

[Ezio Melotti]

Ezio Melotti added the comment:

You should use assertRaises/assertRaisesRegex to check the error message and add more tests to cover all the changes.  I also noticed an inconsistence between 'element not in container' and 'element is not in container' (note the extra 'is').  FWIW I prefer the version without 'is'.

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stage: needs patch -> patch review

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<http://bugs.python.org/issue13349>
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