[issue13349] Uninformal error message in index() and remove() functions

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

doctests by their very nature tend to overspecify things - that's why actual regression tests should be written with unittest, while doctest is kept for its originally intended purpose of testing examples included in docstrings and other documentation.

Still, there's also a reason why IGNORE_EXCEPTION_DETAIL is an available doctest option.

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nosy: +ncoghlan

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