[Python-Dev] trunc()

[Jeffrey Yasskin]

On Jan 25, 2008 4:28 AM, Facundo Batista <facundobatista at gmail.com> wrote:
> 2008/1/24, Guido van Rossum <guido at python.org>:
>
> > > So you won't be able to construct an int from a float? That sucks (and
> > > is unintuitive).
> >
> > Yes, you can, but you have to specify how you want it done by using
> > trunc() or round() or ceil() or floor(). (In 3.0, round(x) will return
> > an int, not a float.)
>
>
> 2008/1/24, Jeffrey Yasskin <jyasskin at gmail.com>:
>
> > That needs to be updated and implemented. I think the decision was
> > that removing float.__int__() would break too much, so it needs a
> > deprecation warning in 3.0.
>
>
> What I understand here is as int() is "ambiguous", in the future if
> you want to specify how you want to convert a float to int.
>
> But ceil and floor returns a float. And round and trunc will return an
> int. So, how I could convert a float to its upper int? Like this?:
>
> >>> trunc(math.ceil(.3))
> 1

Like this, in 3.0:

>>> math.ceil(2.2)
3

There was a previous thread in which we decided not to change that
behavior in 2.6.

> BTW, int is not giving me a deprecation warning:
>
> >>> int(.1)
> 0

Correct; that's not implemented yet.

-- 
Namasté,
Jeffrey Yasskin
http://jeffrey.yasskin.info/