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

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

I think it's okay to accept Fraction('1.23', 1) -- if only because
rejecting it means changing the default for the 2nd arg to None and that
would slow it down again.

I agree that if the type of the 2nd arg isn't int or long it should be
rejected. That should not slow down the common path (two ints).

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<http://bugs.python.org/issue1682>
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