[Tutor] Hoping for a brief explanation!

[Oscar Benjamin]

On Wed, 17 Aug 2022 at 07:23, Peter Otten <__peter__ at web.de> wrote:
>
> On 16/08/2022 16:04, Mats Wichmann wrote:
>
> > There is a different type in Python that you can use when you need to
> > keep exactness (for example when representing monetary transactions)
> >
> > https://docs.python.org/3/library/decimal.html
>
> You may run into counterintuitive results with that, too.
>
>  >>> from decimal import Decimal, getcontext
>  >>> getcontext().prec = 3
>  >>> x = Decimal("0.9999")
>  >>> x < 1
> True
>  >>> x * x < 1
> False
>
> There is no numerical type that "just works" like you learned at school.

There is Fraction which gives perfectly exact results for all of the
examples presented in this thread.

--
Oscar