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From: Chris Angelico <rosuav@gmail.com>
Newsgroups: comp.lang.python
Subject: Re: Clean Singleton Docstrings
Date: Sun, 17 Jul 2016 17:51:47 +1000
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On Sun, Jul 17, 2016 at 5:41 PM, Marko Rauhamaa <marko@pacujo.net> wrote:
> Chris Angelico <rosuav@gmail.com>:
>
>> The trouble is, repeated addition of fractions is *able* to deliver an
>> exact result. It just might result in an incredibly slow program.
>
> True, although the programmer has control over the feature. If you
> *want* the luxury of exact fractions, you pay the price. If you don't,
> you make the numbers inexact.

Not if you have a single "Number" type:

On Sat, Jul 16, 2016 at 4:53 PM, Random832 <random832@fastmail.com> wrote:
> Eliminate both of them. Move to a single abstract numeric type* a la
> Scheme, with an "inexact" attribute (inexact numbers may or may not be
> represented by a float, or by the same bigint/decimal/rational types as
> exact ones with a flag set to mark them as inexact.)

Currently yes, you can choose to use fractions.Fraction and pay the
price. How, if you have a single type with different representations,
can you make that choice?

ChrisA