Python——spuer()

class Base():
    def __init__(self):
        print('Base',self)

class A(Base):  
    def __init__(self):
        print('start A',self)
        super(A,self).__init__()
        print('end A',self)

class B(Base):  
    def __init__(self):
        print('start B',self)
        super(B,self).__init__()
        print('end B',self)

class C(A,B):
    def __init__(self):
        print('start C',self)
        super(C,self).__init__()
        print('end C',self)

c=C()
print(c.__class__.mro())

结果

start C <__main__.C object at 0x02B01770>
start A <__main__.C object at 0x02B01770>
start B <__main__.C object at 0x02B01770>
Base <__main__.C object at 0x02B01770>
end B <__main__.C object at 0x02B01770>
end A <__main__.C object at 0x02B01770>
end C <__main__.C object at 0x02B01770>
[<class '__main__.C'>, <class '__main__.A'>, <class '__main__.B'>, <class '__main__.Base'>, <class 'object'>]

spuer原理为

def spuer(cls,inst):
    mro=inst.__class__.mro()
    return mro[mro.index(cls)+1]

获取inst的mro列表，返回mro表中cls的下一个类
上述例子中，self始终为C的实例