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Groups > comp.lang.python > #32958

int.__init__ incompatible in Python 3.3

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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?


Uli

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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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