simple float numbers problem

[Ladvánszky Károly]

Lisp does the right thing:
(= (+ 10 15.99) 25.99)
T

Does Lisp not use the math processor?

"Vio" <vmilitaru at sympatico.ca> az alábbiakat írta a következo hírüzenetben:
mailman.548.1068222897.702.python-list at python.org...
> I need to test for equality between simple 2 decimal numbers. For example:
>
> if (10 + 15.99) == 25.99:
>        do some stuff...
>
> The preceding sentence should be TRUE, but to Python it appears FALSE.
> Which is wrong.
>
> Perhaps because Python translates "25.99" to "25.98999999999999998" and
> not "25.99", which may be the reason for this error (me guessing...). If
> that's the case, how do I force Python to only use 2 decimal points, and
> not "make up" superfluous decimals? Or if that's not the cause for the
> problem, how do I make Python see my math expression as TRUE (as it
> "should" be)?
>
> Cheers,
> Vio
>
> PS. If it's of any help, I'm using Python2.3 (GCC 2.95.4 20011002
> (Debian prerelease))
>
>
>