On Tue, Jan 1, 2013 at 12:07 AM, Steven D'Aprano <st...@pearwood.info> wrote: > > Again, I was mistaken. x%1 is not suitable to get the fraction part of a > number in Python: it returns the wrong result for negative values. You need > math.modf: > > py> x = -99.25 > py> x % 1 # want -0.25 > 0.75 > py> math.modf(x) > (-0.25, -99.0)
math.modf wraps libm's modf, which takes a double. This isn't suitable for Decimal, Fraction, or a custom number type. What's wrong with using math.trunc for this? _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
