[issue23602] Implement __format__ for Fraction

[Tuomas Suutari]

Tuomas Suutari added the comment:

Serhiy Storchaka wrote:
>>>> from fractions import Fraction as F
>>>> format(F(1, 3), '.30f')
> '0.333333333333333333333333333300'

Good catch! I'll try to fix this and add some more test cases.

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