Python 的类

看Django源代码，类的继承搞不太懂，所以先学习学习。

 1 # -*- coding:utf-8 -*-
 2
 3 class SchoolMember:
 4     def __init__(self,name,age):
 5         self.name = name
 6         self.age = age
 7         print ‘init SchoolMember: ‘, self.name, self.age
 8
 9     def tell(self):
10         print ‘name:%s; age:%s‘ % (self.name, self.age)
11
12
13 class Teacher(SchoolMember):
14     def __init__(self,name,age,salary):
15         # 继承 schoolmember类，name ,age 属性？？？？ 这到底是继承还是重写呢？
16         # 首先，继承了父类，先会在父类的初始化，然后继承过来
17         SchoolMember.__init__(self,name,age)
18         self.salary = salary
19         print ‘init Teacher: ‘, self.name
20
21     def tell(self):
22         SchoolMember.tell(self)     # 调用父类的方法
23         print ‘salary: ‘, self.salary
24
25
26 class Student(SchoolMember):
27     def __init__(self,name,age,marks):
28         # 也是继承那个
29         SchoolMember.__init__(self,name,age)
30         self.marks = marks
31         print ‘init Student: ‘, self.name
32
33     def tell(self):
34         SchoolMember.tell(self)
35         print ‘marks: ‘, self.marks
36
37
38 if __name__ == "__main__":
39     t = Teacher(‘yanggang‘, 20, 1000)
40     s = Student(‘liming‘, 12, 86)
41 #    members = [t,s]
42 #    print
43 #    for member in members:
44 #      member.tell()

（1）继承父类之后，用子类的实例，会先走父类，

SchoolMember.__init__(self,name,age) 

总结