[Python-Dev] Return type of round, floor, and ceil in 2.6 (original) (raw)

Guido van Rossum guido at python.org
Fri Jan 4 17:45:46 CET 2008

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(Decimalinstance) 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/)

More information about the Python-Dev mailing list