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Showing content from https://mail.python.org/pipermail/python-dev/2012-October/122271.html below:

[Python-Dev] return type of __complex__

[Python-Dev] return type of __complex__ [Python-Dev] return type of __complex__Mark Dickinson dickinsm at gmail.com
Sat Oct 20 11:41:24 CEST 2012 
On Fri, Oct 19, 2012 at 3:13 PM, Nick Coghlan <ncoghlan at gmail.com> wrote:
> 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

I've opened bugs.python.org/issue16290 to track this.

-- 
Mark
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