[Python-Dev] return type of __complex__

[Mark Dickinson]

On Sun, Oct 21, 2012 at 6:26 AM, Greg Ewing <greg.ewing at canterbury.ac.nz> wrote:
> I think I've changed my mind on this, since it was pointed
> out that if you're going to return a float instead of a
> complex, you should really be implementing __float__, not
> __complex__.

Yes, I'm wavering on this, too.  I'm reasonably convinced that the
complex constructor is wrong to accept a float return from
__complex__.  But it's not clear to me whether it's better to break
backwards compatibility by fixing that in 3.4, or to accept the
mistake and make cmath behave analogously.

> Also PyComplex_AsComplex() should perhaps enforce that.

It already does.  `complex_new` doesn't use `PyComplex_AsCComplex`.

-- 
Mark