How to inherit the properties of a member variable into the host class?

Imagine the following code:

class X(object):
    def geta(self):
        return self.__a

    def seta(self, v):
        self.__a = v

    def __init__(self, a=0):
        self.__a = a

    a = property(geta, seta)

class Y(object):
    def __init__(self, v):
        self.X = X(v)

    # !!! Here, not sure how to do it
    a = X.a


x = X(12)

print x.a
x.a = 2
print x.a

print "-" * 79

y = Y(2)

print y.a

Essentially, what I want is to have class Y inherit class X's properties. So that Y.a will actually go to Y.X.a. So if I say: y = Y(2) and then y.a = 2 it should be as if I did y.X.a = 开发者_运维知识库2.

Is this possible?

Add this to Y:

def __getattr__(self, attr):
    return getattr(self.X, attr)

Now all unresolved attribute references to a Y instance will forward to its contained X.

Properties are inherited like any other attribute... if you actually inherit from the class. What's wrong with that?

class Y(X): pass