[issue23602] Implement __format__ for Fraction

[Tuomas Suutari]

Tuomas Suutari added the comment:

Here's the next round of the patch.

For formatting fractions with any given precision I had to parse the precision from format specifier and at this point it seemed easier to just create a general parser for the Format Specification Mini-Language.  In this patch it is implemented in fractions._parse_format_specifier function, but maybe this kind of general function should be moved to better place and be documented and exported. What do you think?

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Added file: http://bugs.python.org/file38394/issue23602v2.patch

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