Someone

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:                        passclass 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__