[issue18842] Add float.is_finite is_nan is_infinite to match Decimal methods

[Steven D'Aprano]

Steven D'Aprano added the comment:

On Sat, Nov 16, 2013 at 04:33:36PM +0000, Serhiy Storchaka wrote:
> 
> Should we add these methods to other concrete Number subclasses (as Fraction and complex)?

Seems like a good idea to me. Is it worth making them part of the Number 
ABC, or is that too much of a change?

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