[issue13280] argparse should use the new Formatter class

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

There's no reason to switch the implementation.  The % formatting isn't going away and we've decided against doing switch-overs in existing code (it risks introducing bugs while conferring zero benefits to users).

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nosy: +rhettinger

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<http://bugs.python.org/issue13280>
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