[Python-Dev] return type of complex (original) (raw)

Benjamin Peterson benjamin at python.org
Fri Oct 19 18:48:35 CEST 2012

2012/10/19 Tres Seaver <tseaver at palladion.com>:

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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 'complesnew'.

Nobody claimed it did conform to semantics of complex_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.

I'm not saying the code which would break is good, I'm just saying it shouldn't be broken in bugfix releases.

-- Regards, Benjamin

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