Python 2.6: Determining if a method is inherited

Fuzzyman fuzzyman at gmail.com
Mon Oct 6 14:56:51 CEST 2008


On Oct 5, 11:54 pm, Terry Reedy <tjre... at udel.edu> wrote:
> Fuzzyman wrote:
> > Hello all,
>
> > I may well be being dumb (it has happened before), but I'm struggling
> > to fix some code breakage with Python 2.6.
>
> > I have some code that looks for the '__lt__' method on a class:
>
> > if hasattr(clr, '__lt__'):
>
> > However - in Python 2.6 object has grown a default implementation of
> > '__lt__', so this test always returns True.
>
> >>>> class X(object): pass
> > ...
> >>>> X.__lt__
> > <method-wrapper '__lt__' of type object at 0xa15cf0>
> >>>> X.__lt__ == object.__lt__
> > False
>
> In 3.0, the test returns true because function attributes only get
> wrapped when bound.  In the meanwhile, " 'object' in repr(X.__lt__)"
> should do it for you.
>


So long as its never used on a class with 'object' in the name.
Doesn't sound like a particularly *good* solution to me. :-)

Michael

> tjr

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