Serhiy Storchaka added the comment:
I think that Decimal is not needed for Fraction.__format__ (and I'm not sure
that issue23602v4.patch is correct). The correct way to format Fraction as
fixed-precision decimal is to use Fraction.__round__() or similar algorithm.
The implementation can look like:
f = self.__round__(prec)
i = int(f)
return '%d.%0*d' % (i, prec, abs(f - i) * 10**prec)
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<http://bugs.python.org/issue23602>
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