[Python-Dev] return type of complex (original) (raw)
Antoine Pitrou solipsis at pitrou.net
Sun Oct 21 02:15:54 CEST 2012
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On Sat, 20 Oct 2012 00:13:51 +1000 Nick Coghlan <ncoghlan at gmail.com> wrote:
On Fri, Oct 19, 2012 at 11:08 PM, Antonio Cuni <anto.cuni at gmail.com> wrote: > Is that the real intended behavior?
Given the way complex numbers interact with floats generally, returning a complex number with no imaginary component as a floating point value seems legitimate and the checks in cmath overly strict. Otherwise you would get redundancy like: def complex(self): return complex(value) or def complex(self): return value + 0j
The redundancy sounds like a non-issue to me, since you can implement float instead:
class C: ... def float(self): return 5.0 ... complex(C()) (5+0j) cmath.cos(C()) (0.28366218546322625+0j)
Regards
Antoine.
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