[issue21879] str.format() gives poor diagnostic on placeholder mismatch

[Eric V. Smith]

Eric V. Smith added the comment:

I don't think we can change the exception type in a bugfix release, if ever. I don't see much point in changing the exception type: it's just churn.

I'm +1 for a better error message. I'm -0 on changing the error message in a bugfix release.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21879>
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