Message 107845 - Python tracker

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Content 
Your original:

    "{0[-1]}".format('fox')

is a worse gotcha than:

    "{-1}".format('fox')

because you're much less likely to want to do the latter.

It's one of those things that it would be nice to have fixed, or we could just add a warning to the documentation that it _might_ be fixed in the future, so people shouldn't rely on the current behaviour. :-)