Question:

Consider the following code, what will it output?

class A(object):
    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):
        super(B, self).go()
        print("go B go!")

class C(A):
    def go(self):
        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):
        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()

# specify output from here onwards

a.go()
b.go()
c.go()
d.go()
e.go()

a.stop()
b.stop()
c.stop()
d.stop()
e.stop()

a.pause()
b.pause()
c.pause()
d.pause()
e.pause()

Answer:

 

The output is specified in the comments in the segment below:

a.go()
# go A go!

b.go()
# go A go!
# go B go!

c.go()
# go A go!
# go C go!
 
d.go()
# go A go!
# go C go!
# go B go!
# go D go!

e.go()
# go A go!
# go C go!
# go B go!

a.stop()
# stop A stop!

b.stop()
# stop A stop!

c.stop()
# stop A stop!
# stop C stop!

d.stop()
# stop A stop!
# stop C stop!
# stop D stop!

e.stop()
# stop A stop!
 
a.pause()
# ... Exception: Not Implemented

b.pause()
# ... Exception: Not Implemented

c.pause()
# ... Exception: Not Implemented

d.pause()
# wait D wait!

e.pause()
# ...Exception: Not Implemented

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