class meta(type):
    def __init__(cls, name, bases, dict):
        super(meta, cls).__init__(name, bases, dict)
        for base in cls.__bases__:
                try:
                        cls.__stuff__.update(base.__stuff__)
                except:
                        pass

class A:
    __metaclass__ = meta
    __stuff__ = { "stuffA" : ""}

class B(A):
    __stuff__ = { "stuffB" : ""}

class C(A):
    __stuff__ = { "stuffC" : ""}

class D(B, C):
     __stuff__= { "stuffD" : ""}

class E(D):
    __stuff__ = { "stuffE" : ""}
    
x=E()
print x.__stuff__