[issue33669] str.format should raise exception when placeholder number doesn't match argument number

[Xiang Zhang]

Xiang Zhang <angwerzx at 126.com> added the comment:

Yes, this is a breaking change. A currently working piece of code suddenly raises an exception.

But, please note Serhiy in your example you have the same bug as me, you've gotten an oversight bug in it: it's {:d} not %s. That's why I want the improvement.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33669>
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