[Python-Dev] Return type of round, floor, and ceil in 2.6

[Guido van Rossum]

On Jan 4, 2008 8:37 AM, Facundo Batista <facundobatista at gmail.com> wrote:
> 2008/1/4, Mark Dickinson <dickinsm at gmail.com>:
>
> > That seems a little peculiar to me: wouldn't it be more natural to have
> > round(Decimal_instance) return another Decimal?
>
> Yes.
>
> Now I find that now round() delegates its work to __round__:
>
>   http://docs.python.org/dev/library/functions.html#round
>
> This doc says that round() "Return the floating point value x rounded
> to n digits after the decimal point.".
>
> It don't specify if its binary or decimal floating point, ;)
>
> Feel free to create an issue and assign to me if you think that this
> should be done.

In 3.0, round() of a Decimal should return an int if invoked with 1
arg, a Decimal if invoked with 2. Similar for round() of a float.
round() of an int can always return an int.

In 2.6, round() should always return a float, regardless of the type
of the first arg or the arg count, for best compatibility with 2.5.

-- 
--Guido van Rossum (home page: http://www.python.org/~guido/)