[issue1580] Use shorter float repr when possible

[Christian Heimes]

Christian Heimes added the comment:

Noam Raphael wrote:
> * nan is an object of type float, which behaves like None, that is:
> "nan == nan" is true, but "nan < nan" and "nan < 3" will raise an
> exception. 

No, that's not correct. The standard defines that nan is always unequal
to nan.

False
>>> float("inf") == float("inf")
True
>>> float("inf") == -1*float("-inf")
True

The float module could gain three singletons nan, inf an neginf so you
can do

True

Christian

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<http://bugs.python.org/issue1580>
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