How to use descriptors with attributes of instances?

I read the docs and sa开发者_运维技巧w that descriptors had to be used with class attributes only. What would be an acceptable way of using them within instances of that class?

I.e.

class Attribute( object ):
    def __init__(self, value):
        self.value = value

    def __get__(self, obj, objtype):
        print "GETTING"
    def __set__(self,obj,val):
        print "SETTING"

class MyClass( object ):
    def __init__(self):
        self.myname = Attribute( '' )

name = MyClass()
print name.myname

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Manipulate them via obj, the second argument to the descriptor's methods.