On Sat, 20 Oct 2012 00:13:51 +1000 Nick Coghlan <ncogh...@gmail.com> wrote: > On Fri, Oct 19, 2012 at 11:08 PM, Antonio Cuni <anto.c...@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. -- Software development and contracting: http://pro.pitrou.net _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
