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class Student:

def __init__(self,name,age,score):

self.name = name

self.age = age

self.score = score

def mycmp(s1,s2):

if s1.score != s2.score:

return cmp(s1.score,s2.score)

elif s1.age != s2.age:

return cmp(s1.age,s2.age)

elif s1.name != s2.name:

return cmp(s1.name,s2.name)

else:

return 1

def test():

s1 = Student("abc",20,99)

s2 = Student("bcd",19,97)

s3 = Student("bed",20,97)

stds = [s1,s2,s3]

stds = sorted(stds,cmp=mycmp)

for s in stds:

print s.name,s.age,s.score

if __name__ == "__main__":

test()