[Python-Dev] Symmetry arguments for API expansion

[David Mertz]

If anyone cares, my vote is to rip out both .as_integer_ratio() and
.is_integer() from Python. I've never used either and wouldn't want to.

Both seem like perfectly good functions for the `math` module, albeit the
former is simply the Fraction() constructor.

I can see no sane reason why anyone would ever call float.is_integer()
actually. That should always be spelled math.isclose(x, int(x)) because
IEEE-754. Attractive nuisance is probably too generous, I'd simply call the
method a bug.

On Mon, Mar 12, 2018, 2:21 PM Tim Peters <tim.peters at gmail.com> wrote:

> [Guido]
> > .... as_integer_ratio() seems mostly cute (it has Tim Peters all
> > over it),
>
> Nope!  I had nothing to do with it.  I would have been -0.5 on adding
> it had I been aware at the time.
>
> - I expect the audience is tiny.
>
> - While, ya, _I_ have uses for it, I had a utility function for it
> approximately forever (it's easily built on top of math.frexp()).
>
> - Especially now, fractions.Fraction(some_float) is the same thing
> except for return type.
>
>
> > OTOH it looks like Decimal has it,
>
> Looks like ints got it first, and then spread to Decimal because "why
> not?" ;-)  The first attempt to spread it to Decimal I found was
> rejected (which would have been my vote too):
>
> https://bugs.python.org/issue8947
>
>
> > so I think this ship has sailed too and maybe it's best to add it to the
> > numeric tower just to be done with it.
>
> Or rip it out of everything.  Either way works for me ;-)
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