Python多继承super的使用

采用新式类super继承，基类必须继承object，并且在多重继承时，父类只执行一次

class A(object):
    def __init__(self):
        print ("enter A")
        super(A, self).__init__()  # new
        print ("leave A")

class B(object):
    def __init__(self):
        print ("enter B")
        super(B, self).__init__()  # new
        print ("leave B")

class C(A):
    def __init__(self):
        print ("enter C")
        super(C, self).__init__()
        print ("leave C")

class D(A):
    def __init__(self):
        print ("enter D")
        super(D, self).__init__()
        print ("leave D")

class E(B, C):
    def __init__(self):
        print ("enter E")
        super(E, self).__init__()  # change
        print ("leave E")

class F(E, D):
    def __init__(self):
        print ("enter F")
        super(F, self).__init__()  # change
        print ("leave F")


f = F()

结果：

enter F
enter E
enter B
enter C
enter D
enter A
leave A
leave D
leave C
leave B
leave E
leave F