模板方法模式Python版 考題抄錯會做也白搭

重複=易錯+難改

class test*****a

def testquestion1(self):
print "test question 1"
print "answer: b"
def testquestion2(self):
print "test question 2"
print "answer: a" 
def testquestion3(self):
print "test question 3"
print "answer: c" 
class test*****a
def testquestion1(self):
print "test question 1"
print "answer: d"
def testquestion2(self):
print "test question 2"
print "answer: b" 
def testquestion3(self):
print "test question 3"
print "answer: a" 
if __name__ == "__main__":
print "student a's test *****: "
studenta = test*****a()
studenta.testquestion1()
studenta.testquestion2()
studenta.testquestion3() 
studentb = test*****b() 
studentb.testquestion1()
studentb.testquestion2()
studentb.testquestion3()

class test*****:

def testquestion1(self):
print "test question 1" 
def testquestion2(self):
print "test question 2"
def testquestion3(self):
print "test question 3"
class test*****a(test*****):
def testquestion1(self):
test*****.testquestion1() 
print "answer: b" 
def testquestion2(self):
test*****.testquestion2() 
print "answer: a" 
def testquestion3(self):
test*****.testquestion3() 
print "answer: c" 
class test*****b(test*****):
def testquestion1(self):
test*****.testquestion1() 
print "answer: d" 
def testquestion2(self):
test*****.testquestion2() 
print "answer: b" 
def testquestion3(self):
test*****.testquestion3() 
print "answer: a"

改動一下，增加answer

class test*****:

def testquestion1(self):
print "test question 1" 
print "answer: ",self.answer1() 
def testquestion2(self):
print "test question 2"
print "answer: ",self.answer2() 
def testquestion3(self):
print "test question 3"
print "answer: ",self.answer3() 
def answer1(self)
pass
def answer2(self)
pass
def answer3(self)
pass 
class test*****a(test*****):
def answer1(self)
return "b" 
def answer2(self)
return "a" 
def answer3(self)
return "c" 
class test*****b(test*****):
def answer1(self)
return "d" 
def answer2(self)
return "b" 
def answer3(self)
return "a"

class abstractclass:

def primitiveoperation1(self):
pass
def primitiveoperation2(self):
pass 
def templatemethod(self):
self.primitiveoperation1()
self.primitiveoperation2()
class concreteclassa(abstractclass):
def primitiveoperation1(self):
print "concrete class a operation 1"
def primitiveoperation2(self):
print "concrete class a operation 2" 
class concreteclassb(abstractclass):
def primitiveoperation1(self):
print "concrete class b operation 1"
def primitiveoperation2(self):
print "concrete class b operation 2" 
if __name__ =="__main__":
c = concreteclassa() 
c.templatemethod()
c = concreteclassb() 
c.templatemethod()

模板方法模式就是提供了乙個很好的**復用平台。

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