Re: extend methods of decimal module

From	Terry Reedy <tjreedy@udel.edu>
Subject	Re: extend methods of decimal module
Date	2014-02-19 17:10 -0500
References	<02cdd9c7-aef7-4cc7-a813-cd1c9627ceb4@googlegroups.com> <mailman.7160.1392836388.18130.python-list@python.org> <94b1962a-0004-4c5b-b484-972a166b88b5@googlegroups.com> <CAKJDb-NaZmLysq+2KWgd_f4UPKCk7jdLZkvcCM6ECL5TSAwCRQ@mail.gmail.com>
Newsgroups	comp.lang.python
Message-ID	<mailman.7165.1392847869.18130.python-list@python.org> (permalink)

Show all headers | View raw

On 2/19/2014 4:54 PM, Zachary Ware wrote:
> On Wed, Feb 19, 2014 at 3:30 PM, Mark H. Harris <harrismh777@gmail.com> wrote:
>>>
>>> The decimal module implements IEEE 854
>>>
>>
>> Thanks Terry...   ... long time.
>>
>> I would like to find out if there is some iron-clad policy about extending
>> the implementation of an IEEE standard... decimal module in this case;  I'm
>> just thinking that this particular extension really fits the python
>> "batteries included" philosophy.
>>
>> I guess what I'm really asking for are the same routines found in "bc -l"
>> math library. I've finally moved my number crunching stuff to python (from bc)
>> because the performance of "decimal" is finally way better than bc for the
>> moment, and wrapping python are the math routines for control and processing
>> is so much better.   Anyway, sure would be nice to have a very speedy atan()
>> function built-in for decimal.
>
> You might consider suggesting a "decimal.math" module on python-ideas.

Or just dmath. I think this is a better idea than suggesting additions 
to decimal itself. For one thing, anything put in decimal would be 
subject to change if the function were to be added to the standard. It 
is worth noting in such a posting that Krah's speedup make such 
functions really feasible. The algorithms could be similar, at least 
initially, to the one used for floats.

-- 
Terry Jan Reedy

Thread

extend methods of decimal module "Mark H. Harris" <harrismh777@gmail.com> - 2014-02-19 07:30 -0800
  Re: extend methods of decimal module Terry Reedy <tjreedy@udel.edu> - 2014-02-19 13:59 -0500
    Re: extend methods of decimal module "Mark H. Harris" <harrismh777@gmail.com> - 2014-02-19 13:30 -0800
      Re: extend methods of decimal module Zachary Ware <zachary.ware+pylist@gmail.com> - 2014-02-19 15:54 -0600
      Re: extend methods of decimal module Terry Reedy <tjreedy@udel.edu> - 2014-02-19 17:10 -0500
        Re: extend methods of decimal module "Mark H. Harris" <harrismh777@gmail.com> - 2014-02-27 04:07 -0800
          Re: extend methods of decimal module Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2014-02-27 14:42 +0000
            Re: extend methods of decimal module "Mark H. Harris" <harrismh777@gmail.com> - 2014-02-27 07:42 -0800
              Re: extend methods of decimal module Chris Angelico <rosuav@gmail.com> - 2014-02-28 02:57 +1100
              Re: extend methods of decimal module Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2014-02-27 16:24 +0000
                Re: extend methods of decimal module "Mark H. Harris" <harrismh777@gmail.com> - 2014-02-27 15:00 -0800
                Re: extend methods of decimal module Wolfgang <xpysol@gmail.com> - 2014-02-27 15:43 -0800
                Re: extend methods of decimal module Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2014-02-27 23:50 +0000
                Re: extend methods of decimal module "Mark H. Harris" <harrismh777@gmail.com> - 2014-02-27 18:15 -0800
                Re: extend methods of decimal module Chris Angelico <rosuav@gmail.com> - 2014-02-28 15:26 +1100
                Re: extend methods of decimal module "Mark H. Harris" <harrismh777@gmail.com> - 2014-02-27 21:18 -0800
                Re: extend methods of decimal module Chris Angelico <rosuav@gmail.com> - 2014-02-28 16:26 +1100
                Re: extend methods of decimal module Wolfgang Maier <wolfgang.maier@biologie.uni-freiburg.de> - 2014-02-28 08:54 +0000
                Re: extend methods of decimal module "Mark H. Harris" <harrismh777@gmail.com> - 2014-02-28 10:23 -0800
                Re: extend methods of decimal module Steven D'Aprano <steve@pearwood.info> - 2014-02-28 03:15 +0000
                Re: extend methods of decimal module "Mark H. Harris" <harrismh777@gmail.com> - 2014-02-27 20:41 -0800
                Re: extend methods of decimal module Chris Angelico <rosuav@gmail.com> - 2014-02-28 16:00 +1100
                Re: extend methods of decimal module Steven D'Aprano <steve@pearwood.info> - 2014-02-28 07:34 +0000
                Re: extend methods of decimal module Chris Angelico <rosuav@gmail.com> - 2014-02-28 19:52 +1100
                Re: extend methods of decimal module Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-02-28 15:11 +0000
                Re: extend methods of decimal module Chris Angelico <rosuav@gmail.com> - 2014-03-01 02:36 +1100
                Re: extend methods of decimal module "Mark H. Harris" <harrismh777@gmail.com> - 2014-02-28 10:34 -0800
                Re: extend methods of decimal module Chris Angelico <rosuav@gmail.com> - 2014-03-01 05:37 +1100
                Re: extend methods of decimal module "Mark H. Harris" <harrismh777@gmail.com> - 2014-02-28 11:26 -0800
                Re: extend methods of decimal module "Mark H. Harris" <harrismh777@gmail.com> - 2014-02-28 11:39 -0800
                Re: extend methods of decimal module "Mark H. Harris" <harrismh777@gmail.com> - 2014-02-28 12:17 -0800
          Re: extend methods of decimal module Terry Reedy <tjreedy@udel.edu> - 2014-02-27 12:07 -0500
            Re: extend methods of decimal module Anssi Saari <as@sci.fi> - 2014-03-01 08:55 +0200
              Re: extend methods of decimal module "Mark H. Harris" <harrismh777@gmail.com> - 2014-03-01 16:49 -0800
          Re: extend methods of decimal module Chris Angelico <rosuav@gmail.com> - 2014-02-28 04:48 +1100
      Re: extend methods of decimal module Zachary Ware <zachary.ware+pylist@gmail.com> - 2014-02-19 16:27 -0600
      Re: extend methods of decimal module casevh@gmail.com - 2014-02-19 21:11 -0800
        Re: extend methods of decimal module "Mark H. Harris" <harrismh777@gmail.com> - 2014-02-27 02:33 -0800
          Re: extend methods of decimal module casevh@gmail.com - 2014-02-28 06:23 -0800
  Re: extend methods of decimal module Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2014-02-19 22:29 +0000
    Re: extend methods of decimal module "Mark H. Harris" <harrismh777@gmail.com> - 2014-02-27 02:37 -0800

csiph-web