python's OOP question

neoedmund neoedmund at gmail.com
Mon Oct 16 08:02:55 CEST 2006


Oh, How great is the solution!  ( though i don't know how it works. )
Thank you George.

George Sakkis wrote:
> neoedmund wrote:
>
> > python use multiple inheritance.
> > but "inheritance" means you must inherite all methods from super type.
> > now i just need "some" methods from one type and "some" methods from
> > other types,
> > to build the new type.
> > Do you think this way is more flexible than tranditional inheritance?
>
> The following does the trick:
>
> from types import MethodType
>
> def addMethod(meth, obj):
>     f = meth.im_func
>     setattr(obj, f.__name__, MethodType(f,obj))
>
> def test1():
>     addMethod(C2.m, C3)
>     addMethod(C1.v, C3)
>     o = C3()
>     o.m()
>
> The same works as is on modifying individual instances, rather than
> their class:
>
> def test2():
>     o = C3()
>     addMethod(C2.m, o)
>     addMethod(C1.v, o)
>     o.m()
>     # raises AttributeError
>     # C3().m()
> 
>  
> George




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