[issue1682] Move Demo/classes/Rat.py to Lib/rational.py and fix it up.

[Guido van Rossum]

Guido van Rossum added the comment:

> Fair enough.  Should it be fractions.Fraction or fraction.Fraction?

I think "from fractions import Fraction" is linguistically more
correct -- the concept is always mentioned in plural, but a fractional
number is of course singular.  We also have "numbers".

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