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Showing content from https://mail.python.org/pipermail/python-dev/2002-October/029270.html below:

PEP239 (Rational Numbers) Reference Implementation and new issues

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Greg> If rationals and slice objects were the same thing,
Greg> it wouldn't matter!

Andrew> But then how would you distinguish between x[1:4] and x[2:8]?

Greg> Well, if you reduced the rational to lowest terms you
Greg> would have to keep the original values around for when
Greg> you were using it as a slice object...

In that case, wouldn't you have a situation where a==b, a and b are
the same type, but x[a]!=x[b]?

-- 
Andrew Koenig, ark@research.att.com, http://www.research.att.com/info/ark

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