[Python-Dev] Expert floats

[Andrew Koenig]

> I believe Ping would have
> 
> >>> 2.20 - 1.20
> 1.0000000000000002

As would I.

> because "1.0000000000000002" is the shortest string that evals to the true
> machine result.  OTOH, he'd have
> 
> >> 2.20 - 1.10
> 1.1

Believe it or not, this apparent anomaly doesn't bother me, but

>>> 1.1
1.1000000000000001

does.  The reason is that the first example does arithmetic, and it is easy
to explain that floating-point arithmetic is not completely accurate.