[Python-Dev] PEP239 (Rational Numbers) Reference Implementation and new issues

[Christopher A. Craig]

"Eric S. Raymond" <esr@thyrsus.com> writes:

> APL faced this problem twenty-five years ago.  I like its solution; 
> a `fuzz' variable defining the close-enough-for-equality range.

For what it's worth, the current implementation is nothing this
complicated.  Like every other numeric operation, compares of
rationals with floats coerce to floats.  So as a result
rational(x)==float(x) iff float(rational(x))==float(x).

That is, of course, much more permissive than if we coerced the other
way and had rational(x)==float(x) iff rational(x)==rational(float(x)).

-- 
Christopher A. Craig <python-pep@ccraig.org>
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