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()
# 说明下列代码的输出结果
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()
答案
输出结果以注释的形式表示：
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