class a(object):
    def __init__(self):
        print "a"
        super(a, self).__init__()
        pass

class b(a):
    def __init__(self, foon='hooha'):
        print "b, foon=%s" % foon
        super(b, self).__init__()

class c(a):
    def __init__(self):
        print "c"
        super(c, self).__init__()

class d(c,b):
    def __init__(self, **kwargs):
        print "d"
        super(d, self).__init__(**kwargs)

d()
d(foon="blah")