[issue23602] Implement __format__ for Fraction

[Mark Dickinson]

Mark Dickinson added the comment:

[Eric]

> I'm not sure it needs fixing...

Hmm.  We've gone to some lengths to make sure that we get correctly-rounded results for formatting of Decimal and float types, as well as to make sure that operations like converting a Fraction to a float are correctly rounded.  It would be disappointing if the result of formatting a Fraction wasn't correctly rounded, and I'd personally consider it a bug.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23602>
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