[BangPypers] A link I found today

Anand Balachandran Pillai abpillai at gmail.com
Mon Oct 12 12:32:30 CEST 2009


On Mon, Oct 12, 2009 at 3:47 PM, Anand Chitipothu <anandology at gmail.com>wrote:

> On Mon, Oct 12, 2009 at 2:42 PM, Baiju Muthukadan <baiju at muthukadan.net>
> wrote:
> > http://bitcheese.net/wiki/nopython
> >
> > Don't start a flame war now, please ;)
>
> 2.3 - 3.4 and 2/3.0 in Python, Ruby and Haskell interpreters.
>
> $ python3.0
> Python 3.0.1 (r301:69597, Feb 14 2009, 19:03:52)
> [GCC 4.0.1 (Apple Inc. build 5490)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
> >>> 2.3 - 3.4
> -1.1000000000000001
> >>> 2/3.0
> 0.66666666666666663
>
> $ irb
> >> 2.3 - 3.4
> => -1.1
> >> 2/3.0
> => 0.666666666666667
> >> ^D
>
> $ ghci
> GHCi, version 6.8.2: http://www.haskell.org/ghc/  :? for help
> Loading package base ... linking ... done.
> Prelude> 2.3 - 3.4
> -1.1
> Prelude> 2/3.0
> 0.6666666666666666
> Prelude> Leaving GHCi.
>
> It looks like number of decimal digits printed are 17 in Python, 16 in
> Haskell and 15 in Ruby.
>
> Is there any way to change that behavior in Python?
>

 Not in the interpreter AFAIK. In code, use Decimal type.

import decimal
 >>> x=decimal.Decimal('2.3')
>>> y=decimal.Decimal('3.4')
>>> x-y
Decimal("-1.1")

I am not however a fan of the decimal module since it uses strings as the
base type.


> Anand
> _______________________________________________
> BangPypers mailing list
> BangPypers at python.org
> http://mail.python.org/mailman/listinfo/bangpypers
>



-- 
--Anand
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