一，解决类与类之间代码允余问题有两种方案： 1，继承 2，组合
1，继承：描述的是类与类之间，什么是什么的关系
2，组合：描述的是类与类之间的关系，是一种什么有什么关系
一个类产生的对象，该对象拥有一个属性，这个属性的值是来自另一个类的对象
1 class Date:
2 def __init__(self,year,mon,day):
3 self.year = year
4 self.mon = mon
5 self.day = day
6
7 def tell_birth(self):
8 print('出生年月日<%s-%s-%s>' % (self.year, self.mon, self.day))
9
10 class OldboyPeople:
11 school = 'oldboy'
12
13 def __init__(self, name, age, sex):
14 self.name = name
15 self.age = age
16 self.sex = sex
17
18 class OldboyTeacher(OldboyPeople):
19 def __init__(self,name,age,sex,level,salary):
20 super().__init__(name,age,sex)
21 self.level=level
22 self.salary=salary
23
24 def change_score(self):
25 print('teacher %s is changing score' %self.name)
26
27 class Oldboystudent(OldboyPeople):
28 def __init__(self,name,age,sex,course,):
29 super().__init__(name,age,sex,)
30 self.course=course
31
32 def choose(self):
33 print('student %s choose course' %self.name)
34
35
36 tea1=OldboyTeacher('egon',18,'male',9,3.1)
37 date_obj=Date(2000,1,1)
38 # date_obj.tell_birth()
39
40 tea1.birth=date_obj
41 # print(tea1.birth)
42 # tea1.birth.tell_birth()
43 # tea1.change_score()
44
45 stu1=Oldboystudent('张三',16,'male','linux')
46 stu1.birth=Date(2002,3,3)
47 stu1.birth.tell_birth()二，组合练习：
1 class OldboyPeople:
2 school = 'oldboy'
3
4 def __init__(self, name, age, sex,):
5 self.name = name
6 self.age = age
7 self.sex = sex
8
9 class OldboyTeacher(OldboyPeople):
10 def __init__(self,name,age,sex,level,salary):
11 super().__init__(name,age,sex)
12 self.level=level
13 self.salary=salary
14
15 self.courses=[]
16
17 def change_score(self):
18 print('teacher %s is changing score' %self.name)
19
20 def tell_course_info(self):
21 print(('老师%s 教授的课程信息如下' %self.name).center(50,'='))
22 for course_obj in self.courses:
23 course_obj.info()
24
25
26 class Oldboystudent(OldboyPeople):
27 def __init__(self,name,age,sex):
28 super().__init__(name,age,sex,)
29 self.courses=[]
30
31 def choose(self):
32 print('student %s choose course' %self.name)
33
34 def tell_course_info(self):
35 print(('学生%s 学习的课程信息如下' % self.name).center(50, '='))
36 for course_obj in self.courses:
37 course_obj.info()
38
39 class Course:
40 def __init__(self,cname,period,price):
41 self.cname=cname
42 self.period=period
43 self.price=price
44
45 def info(self):
46 print('课程信息<名字：%s 周期：%s 价钱：%s>' %(self.cname,self.period,self.price))
47
48
49 tea1=OldboyTeacher('egon',18,'male',9,3.1)
50 stu1=Oldboystudent('张三',16,'male')
51
52 python=Course('Python全栈开发','5mons',3000)
53 linux=Course('Linux高级架构师','5mons',2000)
54 go=Course('Go开发工程师','3mons',1000)
55
56
57 # # 给老师添加课程
58 # tea1.courses.append(python)
59 # tea1.courses.append(linux)
60
61 # print(tea1.courses)
62 # tea1.courses[0].info()
63 # for course_obj in tea1.courses:
64 # course_obj.info()
65
66 # tea1.tell_course_info()
67
68
69 # 给学生添加课程
70 stu1.courses.append(python)
71 stu1.courses.append(go)
72 stu1.courses.append(linux)
73 stu1.tell_course_info()
