Python 面向对象（二）

 1 #定义2个父类
 2 class Parent1:
 3     pass
 4 
 5 class Parent2:
 6     pass
 7 
 8 #定义2个子类
 9 #子类的单继承
10 class sub1(Parent1):
11     pass
12 #子类的多继承
13 class sub2(Parent1,Parent2):
14     pass
15 #查看子类继承了哪些父类__bases__
16 # print(sub1.__bases__)  #(<class ‘__main__.Parent1‘>,)
17 # print(sub2.__bases__)   #(<class ‘__main__.Parent1‘>, <class ‘__main__.Parent2‘>)
18 #
19 #
20 # print(Parent1.__base__)#<class ‘object‘>

 1 #原来的书写方式 这样写有代码冗余
 2 
 3 #1  student类
 4 class Student:
 5     school=‘oldboyedu‘
 6     def __init__(self,name,age,sex):
 7         self.Name=name
 8         self.Age=age
 9         self.Sex=sex
10 
11     def learn(self):
12         print(‘%s is learning‘%self.Name)
13 
14 
15 class Teacher:
16     school = ‘oldboyedu‘
17 
18     def __init__(self, name, age, sex):
19         self.Name = name
20         self.Age = age
21         self.Sex = sex
22 
23     def teach(self):
24         print(‘%s is teach python‘%self.Name)
25 
26 #通过继承的方式减少冗余
27 
28 class OldboyPerson:
29     school=‘oldboyedu‘
30     def __init__(self,name,age,sex):
31         self.Name=name
32         self.Age=age
33         self.Sex=sex
34     def tell_info(self):
35         print(‘info:%s-%s-%s‘%(self.Name,self.Age,self.Sex))
36 class Student(OldboyPerson):
37     def learn(self):
38         print(‘%s is learning‘%self.Name)
39 
40     def tell_info(self):
41         print(‘infostuent:%s-%s-%s‘%(self.Name,self.Age,self.Sex))
42 class Teacher(OldboyPerson):
43     def teach(self):
44         print(‘%s is teach python‘%self.Name)
45     def tell_info(self):
46         print(‘infoteacher:%s-%s-%s‘%(self.Name,self.Age,self.Sex))
47 
48 
49 #派生的概念 参照对象的属性查找顺序：
50 #对象的名称空间-->对象所在类的数据属性函数属性-->如果没有的话查找继承的父类的数据属性和函数属性
51 
52 
53 stu1=Student(‘nod‘,‘25‘,‘M‘)
54 tea1=Teacher(‘luna‘,‘26‘,‘F‘)
55 stu1.tell_info()
56 tea1.tell_info()

 1 class Foo:
 2     def f1(self):
 3         print(‘foo.f1‘)
 4     def f2(self):
 5         print(‘foo.f2‘)
 6         self.f1()    #obj.f1()
 7 
 8 class Bar(Foo):
 9     def f1(self):
10         print(‘bar.f1‘)
11 
12 obj=Bar()
13 
14 obj.f2()
15 #以上代码的执行效果
16 #foo.f2
17 #bar.f1

 1 #子类重用父类的方法示例
 2 class OldboyPerson:
 3     school=‘oldboyedu‘
 4     def __init__(self,name,age,sex):
 5         self.Name=name
 6         self.Age=age
 7         self.Sex=sex
 8     def tellinfo(self):   #此处的self是1个object  有名称空间
 9         print(‘info is %s-%s-%s‘%(self.Name,self.Age,self.Sex))
10 class Teacher(OldboyPerson):
11     def teach(self):
12         print(‘%s is teach‘%self.Name)
13 #需要重用父类的方法 父类当中本身有tellinfo方法  但是子类当中的tellinfo新增了部分功能
14     def tellinfo(self):
15         print(‘Teacher info‘)
16         OldboyPerson.tellinfo(self)
17 class Student(OldboyPerson):
18     def learn(self):
19         print(‘%s is learning‘%self.Name)
20     def tellinfo(self):
21         print(‘student info‘)
22         OldboyPerson.tellinfo(self)  #重用父类的方法
23 
24 stu1=Student(‘nod‘,‘25‘,‘M‘)
25 stu1.tellinfo()
26 tea1=Teacher(‘luna‘,‘26‘,‘F‘)
27 tea1.tellinfo()
28 
29 
30 #子类重用父类的属性 自己还要新增部分属性示例
31 #不依赖于继承  重用父类的方法
32 
33 
34 class OldboyPerson:
35     school=‘oldboyedu‘
36     def __init__(self,name,age,sex):
37         self.Name=name
38         self.Age=age
39         self.Sex=sex
40     def tellinfo(self):
41         print(‘info is %s-%s-%s‘%(self.Name,self.Age,self.Sex))
42 
43 class Student(OldboyPerson):
44     def __init__(self,name,age,sex,course,id):
45         OldboyPerson.__init__(self,name,age,sex)
46         self.Course=course
47         self.Id=id
48     def tellinfo(self):
49         print(‘student info ‘,end=‘‘)
50         OldboyPerson.tellinfo(self)   #不依赖于继承  重用父类的方法
51         print(‘%s-%s‘%(self.Course,self.Id))
52         print(self.__dict__)
53 
54 stu2=Student(‘nod‘,‘25‘,‘F‘,‘linux‘,‘51‘)
55 stu2.tellinfo()