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

[Pablo Galindo Salgado]

Pablo Galindo Salgado <pablogsal at gmail.com> added the comment:

With the exception of string.FormatterItem, which is the change at hand.

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