Terry J. Reedy added the comment:

IndexError should be caught and replaced with something like
ValueError('format string requests argument not passed') or
TypeError('arguments do not match format string') or more specific
TypeError('format string requests at least %d positional arguments, only %d 
passed')
In Roy's example (a good testcase), the numbers would be 1 and 0.

----------
nosy: +eric.smith, terry.reedy
stage:  -> needs patch
versions: +Python 3.4, Python 3.5

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<http://bugs.python.org/issue21879>
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