python之__str__用法

 1 class Person(object):
 2     def __init__(self,name,gender):
 3         self.name = name
 4         self.gender = gender
 5 
 6     def __str__(self):
 7         return ‘(Person: %s, %s)‘ %(self.name,self.gender)
 8     __repr__ = __str__
 9 p = Person(‘Bob‘,‘male‘)
10 #p = Person()
11 print(p)
12 
13 
14 class Persons(object):
15     def __init__(self,name,gender):
16         self.name = name
17         self.gender = gender
18 
19 class Student(Persons):
20     def __init__(self,name,gender,score):
21         super(Student, self).__init__(name,gender)
22         self.score = score
23 
24     def __str__(self):
25         return ‘(Student: %s, %s, %s)‘ %(self.name,self.gender,self.score)
26 
27 s = Student(‘zou‘,‘nan‘,‘80‘)
28 print(s)