[New-bugs-announce] [issue30477] tuple.index error message improvement

[Joe Jevnik]

New submission from Joe Jevnik:

The old error of tuple.index(x): x not in tuple seemed very confusing to me. It was also harder to quickly understand what the program was doing wrong. This saves people a second pass through the program under the debugger because they can just see what the invalid value was.

The reason I am explicitly calling repr instead of using %R is that I didn't want to call repr twice if I didn't need to. If people think that is fine the format can just be tuple.index(%R): %R not in tuple instead.

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messages: 294516
nosy: brett.cannon, llllllllll
priority: normal
pull_requests: 1906
severity: normal
status: open
title: tuple.index error message improvement
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30477>
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