07.10.20 18:43, Guido van Rossum пише:
> Usability in a different context.
> ```
z = 1j
float(z)
> Traceback (most recent call last):
> File "", line 1, in
> TypeError: can't convert complex to float
float(object())
> Traceback (most recent call last):
> File "", line 1, in
> T
I was making a "convert Fraction to Decimal, exactly if possible" function and
ran into a wall: it's not possible to do some of the necessary operations with
exact precision in decimal:
- multiplication
- division where the result can be represented exactly [the divisor is an
integer whose prim
On Thu, Oct 08, 2020 at 11:58:04AM -0400, Random832 wrote:
> I was making a "convert Fraction to Decimal, exactly if possible"
> function and ran into a wall: it's not possible to do some of the
> necessary operations with exact precision in decimal:
Of course you can't do them with *exact* pre
On Fri, Oct 9, 2020 at 3:43 AM Steven D'Aprano wrote:
>
> On Thu, Oct 08, 2020 at 11:58:04AM -0400, Random832 wrote:
>
> > I was making a "convert Fraction to Decimal, exactly if possible"
> > function and ran into a wall: it's not possible to do some of the
> > necessary operations with exact pre
On Fri, Oct 09, 2020 at 03:53:24AM +1100, Chris Angelico wrote:
> On Fri, Oct 9, 2020 at 3:43 AM Steven D'Aprano wrote:
> >
> > On Thu, Oct 08, 2020 at 11:58:04AM -0400, Random832 wrote:
> >
> > > I was making a "convert Fraction to Decimal, exactly if possible"
> > > function and ran into a wall:
[Random832 ]
> I was making a "convert Fraction to Decimal, exactly if possible" function and
> ran into a wall: it's not possible to do some of the necessary operations with
> exact precision in decimal:
>
> - multiplication
> - division where the result can be represented exactly [the divisor is
On Thu, Oct 8, 2020, at 13:17, Tim Peters wrote:
> [Random832 ]
> > I was making a "convert Fraction to Decimal, exactly if possible" function
> > and
> > ran into a wall: it's not possible to do some of the necessary operations
> > with
> > exact precision in decimal:
> >
> > - multiplication
>
On Thu, Oct 8, 2020, at 13:12, Steven D'Aprano wrote:
> I trimmed it because I didn't understand the relevance. If the
> denominator is an exact multiple of only 2 and 5, then I think the
> conversion will be exact if the precision is sufficient.
I wanted the conversion to be exact irrespective
[Random832]
> I don't understand what's unclear -
Obviously ;-) But without carefully constructed concrete use cases,
what you say continues to remain unclear to me.
> I was suggesting there should be an easy way to have the exact
> result for all operations on Decimal operands that have exact r
