Python——组合与继承

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什么是组合

解决类与类之间代码冗余的问题有两种解决方案：

  • 继承 ：描述的是类与类之间的关系
  • 组合：描述的是一个类产生的对象，该对象拥有一个属性，这个属性的值是来自于另一个类的对象
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class Date:
    def __init__(self,year,mon,day):
        self.year = year
        self.mon = mon
        self.day = day

    def tell_brith(self):
        print('出生日期<%s-%s-%s>'  %(self.year,self.mon,self.day))

class People:
    school = 'Lixin'

    def __init__(self,name,age,gender):
        self.name = name
        self.age = age
        self.gender = gender

class Teacher(People):
    def __init__(self,name,age,gender,level,salary):
        super().__init__(name,age,gender)
        self.level = level
        self.salary = salary

    def change_score(self):
        print('%s teacher is changing score.' %self.name)

class Student(People):
    def __init__(self,name,age,gender,course):
        super().__init__(name,age,gender)
        self.course = course

    def choose(self):
        print('%s student is choosing courses.' %self.name)

teacher_1 = Teacher('Lu',30,'male',10,10000)
date_obj = Date(1988,1,1)
date_obj.tell_brith()

teacher_1.birth = date_obj # 为teacher_1 增加birth属性 值等于date_obj
teacher_1.birth.tell_brith() # teacher_1的名称空间等价于date_obj