class S():
    def go(self):
        print ("go s go!")
    def stop(self):
        print ("stop A stop!")

class A():
    def go(self):
        print ("go A go!")
    def stop(self):
        print ("stop A stop!")
    # def pause(self):
        # raise Exception("Not Implemented")

class B(A):
    def go(self):
        print("开始了B!")
        super(B, self).go()
        print ("go B go!")

class C(A):
    def go(self):
        print("开始了C!")
        super(C, self).go()
        print ("go C go!")

    def stop(self):
        super(C, self).stop()
        print ("stop C stop!")

class D(B,C):
    def go(self):
        print('D开始了 啊  啊')
        super(D, self).go()
        print ("go D go!")

    def stop(self):
        super(D, self).stop()
        print ("stop D stop!")

    def pause(self):
        print ("wait D wait!")

class E(B,C):
    pass

a = A()
b = B()
c = C()
d = D()
e = E()
# 说明下列代码的输出结果

b.go()
输出:开始了B!
go A go!
go B go!
print('---b.go-----')


print('---c.go-----')
c.go()
输出:开始了C!
go A go!
go C go!

print('---d.go 开始-----')
d.go()
输出:
D开始了 啊  啊
开始了B!
开始了C!
go A go!
go C go!
go B go!
go D go!

print(D.mro())
输出: [<class '__main__.D'>, <class '__main__.B'>, <class '__main__.C'>, <class '__main__.A'>, <class 'object'>]
print('---d.go 结束----')

e.go()
开始了B!
开始了C!
go A go!
go C go!
go B go!


print(E.mro())
[<class '__main__.E'>, <class '__main__.B'>, <class '__main__.C'>, <class '__main__.A'>, <class 'object'>]


print('----v.stop----')
c.stop()
输出: stop A stop!
stop C stop!