组合

组合的定义：把一个类的对象变成另一个类的属性

此例中course1这个实例变成了teacher1中的属性了

class People:

    school = 'luffycity'

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

    def teach(self):
        print('%s is teaching' % self.name)

    def study(self):
        print('%s is studying' % self.name)


class Teacher(People):
    def __init__(self, name, age, work):
        super().__init__(name, age)
        self.work = work

    def teach(self):
        super(Teacher, self).teach()


teacher1 = Teacher('alex', 28, 'teach')


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

    def study(self):
        super(Student, self).study()


student1 = Student('gao', 23, 'study')



class Course:
    def __init__(self, course_name, course_price):
        self.course_name = course_name
        self.course_price = course_price

    def func(self):
        print('课程名:%s, 课程价格:%s' % (self.course_name, self.course_price))


course1 = Course('python', 3000)

teacher1.course = course1       # 将一个类的对象变为另一个类的属性
teacher1.course.func()
print()


输出结果：
课程名:python, 课程价格:3000