[issue29696] Use namedtuple in string.Formatter.parse iterator response

[Eric V. Smith]

Eric V. Smith <eric at trueblade.com> added the comment:

It does seem like overkill for something that's rarely used. I'm -0 on the structseq version.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue29696>
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