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

[Marco Buttu]

Marco Buttu added the comment:

The error message is misleading:

>>> s = '{names[-1]} loves {0[1]}'
>>> s.format(('C', 'Python'), names=('Dennis', 'Guido'))
Traceback (most recent call last):
    ...
TypeError: tuple indices must be integers or slices, not str

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nosy: +marco.buttu

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7951>
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