【问题】多重继承时，super函数只初始化继承的第一个类，不初始化第二个类。

class A(object):
    def __init__(self):
        print("init class A")

class B(object):
    def __init__(self):
        print("init class B")

class C(object):
    def __init__(self):
        print("init class C")
        super(C, self).__init__()

class D(object):
    def __init__(self):
        print("init class D")
        super(D, self).__init__()
        
class E(A, B):
    def __init__(self):
        print("init class E")
        super(E, self).__init__()

class F(C, D):
    def __init__(self):
        print("init class F")
        super(F, self).__init__()

if __name__ == ‘__main__‘:
    e = E()
    f = F()