[issue7951] Should str.format allow negative indexes when used for __getitem__ access?

[Matthew Barnett]

Matthew Barnett <python at mrabarnett.plus.com> added the comment:

Re: msg107776.

If it looks like an integer (ie, can be converted to an integer by 'int') then it's positional, otherwise it's a key. An optimisation is to perform a quick check upfront to see whether it starts like an integer.

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