Is there a way to 'mask out' inherited methods?

[Fernando Pérez]

Ralf Juengling wrote:

> 
> Hi,
> 
> I'm fiddling around with some new 2.2.-features. I want to
> inherit from a builtin-type but want to use only a subset
> of its functionality:

Simple example:

In [13]: class mystr(str):
   ....:   def __str__(self):
   ....:     return '<special '+ self + '> '
   ....:   def __meaningless(*args,**kw):
   ....:     raise NotImplementedError,'feature meaningless'
   ....:   __hash__ = __ne__ = __meaningless
   ....:

In [14]: s=mystr('hi')

In [15]: s
Out[15]: 'hi'

In [16]: print s
<special hi>

In [17]: s.__hash__
-------> s.__hash__ ()
---------------------------------------------------------------------------
NotImplementedError                       Traceback (most recent call last)

?

? in __meaningless(*args=('hi',), **kw={})

NotImplementedError: feature meaningless


cheers,

f.