Dynamically Changing the Base Class

Adam C. adamc55 at gmail.com
Mon Jul 7 20:08:56 CEST 2008


On Jul 7, 9:11 am, George Sakkis <george.sak... at gmail.com> wrote:
> On Jul 7, 9:31 am, "Adam C." <adam... at gmail.com> wrote:
>
>
>
> > We have a situation where we want a Swig-generated Python class to
> > have a different base (not object). It doesn't appear that we can
> > coerce Swig into generating the class we want at present (but we are
> > still enquiring).
>
> > Is it possible to dynamically change the base class to something else?
> > Initial experiments appear to show it is not:
> > -------------------------------- snip -------------------------------->>> class Foo(object):
>
> >         pass
>
> > >>> class Foozle(object):
>
> >         pass
>
> > >>> Foozle.__bases__ = (Foo,)
>
> > Traceback (most recent call last):
> >   File "<pyshell#6>", line 1, in <module>
> >     Foozle.__bases__ = (Foo,)
> > TypeError: __bases__ assignment: 'Foo' deallocator differs from
> > 'object'
> > -------------------------------- snip --------------------------------
>
> > Is there a solution I am missing?
>
> > Thanks in advance.
>
> Supposedly it should (usually) work, there's a 6 year old patch for
> this (http://bugs.python.org/issue635933). Check if Swig can generate
> old-style classes (i.e. not inheriting from object) since __bases__
> assignment works for them.
>
> HTH,
> George

Thanks. I think we would want new-style classes, and 6-year-old
patches strike me as maybe a little out of the desired path... so this
really just doesn't work in modern Python?



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