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Groups > comp.lang.python > #32963

Re: int.__init__ incompatible in Python 3.3

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On Thu, Nov 8, 2012 at 8:55 AM, Ulrich Eckhardt
<ulrich.eckhardt@dominolaser.com> wrote:
> Hi!
>
> Preparing for an upgrade from 2.7 to 3, I stumbled across an incompatibility
> between 2.7 and 3.2 on one hand and 3.3 on the other:
>
> class X(int):
>     def __init__(self, value):
>         super(X, self).__init__(value)
> X(42)
>
> On 2.7 and 3.2, the above code works. On 3.3, it gives me a "TypeError:
> object.__init__() takes no parameters". To some extent, this makes sense to
> me, because the int subobject is not initialized in __init__ but in __new__.
> As a workaround, I can simple drop the parameter from the call. However,
> breaking backward compatibility is another issue, so I wonder if that should
> be considered as a bug.
>
> Bug? Feature? Other suggestions?

A similar change was made to object.__init__ in 2.6, so this could
just be bringing the behavior of int into line with object.  There's
nothing about it in the whatsnew document, though.  I say open a bug
report and let the devs sort it out.

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Thread

int.__init__ incompatible in Python 3.3 Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-11-08 16:55 +0100
  Re: int.__init__ incompatible in Python 3.3 Ian Kelly <ian.g.kelly@gmail.com> - 2012-11-08 10:13 -0700
  Re: int.__init__ incompatible in Python 3.3 Terry Reedy <tjreedy@udel.edu> - 2012-11-08 15:29 -0500
    Re: int.__init__ incompatible in Python 3.3 Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-11-09 08:56 +0100
      Re: int.__init__ incompatible in Python 3.3 Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-11-09 11:37 +0000
        Re: int.__init__ incompatible in Python 3.3 Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-11-09 13:52 +0100
        Re: int.__init__ incompatible in Python 3.3 Ian Kelly <ian.g.kelly@gmail.com> - 2012-11-09 09:30 -0700
        Re: int.__init__ incompatible in Python 3.3 Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-11-12 14:48 +0100

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