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

[Joannah Nanjekye]

Joannah Nanjekye <nanjekyejoannah at gmail.com> added the comment:

@dmzz, You can convert the patch into a PR on github or Open a PR with your own implementation.

If working with this same patch, the next step would be to test the patch if it is still in good shape now before opening a PR.

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nosy: +nanjekyejoannah

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