[issue18162] Add index attribute to IndexError

[Ram Rachum]

Ram Rachum added the comment:

Since #21911 has been merged into this issue, I'd like to add: Please also include the length of the sequence in the exception message. It can help with debugging.

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nosy: +cool-RR

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18162>
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