[Python-ideas] isinstance(Decimal(), Real) -> False?

[Mark Dickinson]

On Thu, Aug 29, 2013 at 3:02 AM, Steven D'Aprano <steve at pearwood.info>wrote:

> On 28/08/13 20:48, Draic Kin wrote:
>
>> For the same reason, I could think that isinstance(Decimal, Rational) ->
>> True
>>
>
> If Decimal were a subclass of Rational, so should float. The only
> fundamental difference between the two is that one uses base 10 floating
> point numbers and the other uses base 2.


Exactly, yes!  The "Decimal is a fixed-point type" and "Decimal is exact"
myths seem to be unfortunately common.

Mark
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