How to access parent class object through derived class instance?

Let's suppose I have these classes:

class A():    msg = 'hehehe'class B(A):    msg = 'hohoho'class C(B):    pass

and an instance of B or C. How do I get the variable msg from the parent's class object through this instance?

I've tried this:

foo = B()print super(foo.__class__).msg

but got the message:

TypeError: super() argument 1 must be type, not classobj