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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

collections is a moderately heavy module with many dependencies. string is a light module, it imports only _string. I'm -1 for using namedtuple in the string module.

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nosy: +serhiy.storchaka

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<http://bugs.python.org/issue29696>
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