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

[Eric V. Smith]

Eric V. Smith <eric at trueblade.com> added the comment:

I still think it's a job for a linter, even if the compiler optimizes away the call to .format().

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