[Python-3000] __nonzero__ vs. __bool__

[Guido van Rossum]

I think it would set a good example if __bool__ was *required* to
return exactly True or False and no other object, not even int
instances equal to 0 or 1. Surely that can't be much of a burden. Feel
free to upload an improved patch.

On 11/21/06, Walter Dörwald <walter at livinglogic.de> wrote:
> Guido van Rossum wrote:
> > On 11/21/06, Ivan Krstić <krstic at solarsail.hcs.harvard.edu> wrote:
> >> Guido van Rossum wrote:
> >>> Can anyone help out evaluating this patch? If it has to wait for me
> >>> it's gonna be a looooooong wait...
> >> Looks fine to me functionally, although it seems to gratuitously retab
> >> some code that used to be aligned with tabstop 8 to a tabstop of 4.
> >
> > Thanks! I hope you meant "indentation level" instead of "tabstop".
> > Tomer, can you fix the indentation to be whatever's prevailing in the
> > file you're editing?
>
> Another question is whether __bool__() should be allowed to return an
> int (or any other object), or if it *must* be a bool. (The patch
> currently allows ints). What if __bool__() returns subclasses of int,
> that overwrite __bool__() themself?
>
> Servus,
>    Walter
>
>


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