On Sat, Sep 29, 2018 at 2:32 AM Steve Barnes <gadgetst...@live.co.uk> wrote:

> One of the strengths of the IEEE float, (to set against its many
> weaknesses), is the presence of the magic value NaN. Not a Number, or
> NaA, is especially useful in that it is a valid value in any
> mathematical operation, (always returning NaN), or comparison, (always
> returning False).


>>> nan = float('nan')
>>> nan**0
1.0

... most operations. :-)

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