Raymond Hettinger <python@rcn.com>: > The HP32SII calculator implements a useful rational model using > flags and a maximum denominator register. If the first flag is clear, > fractions are have denominators upto the maximum value. If only > the first flag is set, fractions always use the maximum denominator > as the denominator and are then reduced (i.e. if the max is 8, then > .5 is represented as 1/2 and .1 is represented as 1/8). I can see that being useful when you're doing calculations with, e.g. measurements in 64ths of an inch and you don't care if anything smaller than that isn't quite exact. But I get the impression that the folks who want rationals in Python want them precisely because they're *always* exact. If you couldn't rely on them to always be exact, it would defeat the purpose. Greg Ewing, Computer Science Dept, +--------------------------------------+ University of Canterbury, | A citizen of NewZealandCorp, a | Christchurch, New Zealand | wholly-owned subsidiary of USA Inc. | greg@cosc.canterbury.ac.nz +--------------------------------------+
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