Re: [Python-Dev] subclassing builtin data structures

2015年2月13日 10:28:59 -0800

Are you willing to wait 10 days for an answer? I'm out of round tuits for a
while.
On Fri, Feb 13, 2015 at 10:22 AM, Alexander Belopolsky <
[email protected]> wrote:
>
> On Fri, Feb 13, 2015 at 1:19 PM, Alexander Belopolsky <
> [email protected]> wrote:
> >>
> >> FWIW you're wrong when you claim that "a constructor is no different
> from any other method". Someone else should probably explain this (it's an
> old argument that's been thoroughly settled).
> >
> >
> > Well, the best answer I've got in the past [1] was "ask on python-dev
> since Guido called the operator overriding expectation." :-)
>
>
> And let me repost this bit of history [1]:
>
> Here is the annotated pre-r82065 code:
>
> 39876 gvanrossum def __add__(self, other):
> 39876 gvanrossum if isinstance(other, timedelta):
> 39928 gvanrossum return self.__class__(self.__days +
> other.__days,
> 39876 gvanrossum self.__seconds +
> other.__seconds,
> 39876 gvanrossum self.__microseconds +
> other.__microseconds)
> 40207 tim_one return NotImplemented
> 39876 gvanrossum
>
>
> [1] http://bugs.python.org/issue2267#msg125979
>
-- 
--Guido van Rossum (python.org/~guido)
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