[Python-Dev] return type of __complex__

[Tres Seaver]

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On 10/19/2012 11:56 AM, Benjamin Peterson wrote:
> 2012/10/19 Tres Seaver <tseaver at palladion.com>:
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>> On 10/19/2012 11:26 AM, Benjamin Peterson wrote:
>>> 2012/10/19 Antonio Cuni <anto.cuni at gmail.com>:
>>>> indeed, you are right. So I suppose that in pypy we could just
>>>> relax the check in cmath and be happy. Is there any chance that
>>>> this will be changed in 2.7 and/or 3.x?
>>> 
>>> Certainly 3.x, but not 2.7.
>> 
>> Why not 2.7?  It is a perfectly-backward-compatible change:  no 
>> currenly-working code could possibly break if cmath's restriction
>> was relaxed.
> 
> It's a new feature.

That is an assertion;  I can dqually assert that the current over-strict
typechecking is a bug, because it doesn't conform to the semandics of
'comples_new'.

> Also, it's possible that someone is relying on it throwing for
> non-complex values.

No already working, non-contrived code would break, becuase float is
perfectly-promotable to complex.


Tres.
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Tres Seaver          +1 540-429-0999          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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