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

[Matthew Barnett]

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

On a related note, this doesn't work either:

>>> "{-1}".format("x", "y", "z")
Traceback (most recent call last):
  File "<pyshell#3>", line 1, in <module>
    "{-1}".format("x", "y", "z")
KeyError: '-1'

It could return "z".

It also rejects a leading '+', but that would be optional anyway.

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nosy: +mrabarnett

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