作业4月8号

1、练习上课作业讲解的面向对象代码，明天默写
2、基于上课作业讲解的面向对象代码，扩写Student类
3、加入序列化与反序列化操作
4、对象之间的关联采用id号
5、可以通过id找到对应的文件，然后从文件中反序列化出执行的学校、班级、课程、学生对象

class School:
    school_name = 'OLDBOY'
    def __init__(self,nickname,addr):
        self.nickname =nickname
        self.addr = addr
        self.classes=[]
    def related_class(self,class_obj):
        self.classes.append(class_obj)
    def tell_class(self):
        print(self.nickname.center(60,'='))
        for class_obj in self.classes:
            class_obj.tell_course()
school_obj1=School('好男孩上海校区','上海')
school_obj2=School('老男孩北京校区','北京')
class Class:
    def __init__(self,name):
        self.name = name
        self.course = None
    def related_course(self,course_obj):
        self.course = course_obj
    def tell_course(self):
        print('%s'%self.name,end='')
        self.course.tell_info()
class_obj1 = Class('脱产14期')
class_obj2 = Class('脱产15期')
class_obj3 = Class('脱产29期')
school_obj1.related_class(class_obj1)
school_obj1.related_class(class_obj2)
school_obj2.related_class(class_obj3)
class Course:
    def __init__(self,name,period,price):
        self.name=name
        self.period = period
        self.price = price
    def tell_info (self):
        print('课程名：%s 周期：%s 价格%s' %(self.name,self.period,self.price))
course_obj1= Course('python','6mons','20000')
course_obj2 = Course('linux','5mons','10000')
class_obj1.related_course(course_obj1)
class_obj2.related_course(course_obj2)
class_obj3.related_course(course_obj1)
school_obj1.tell_class()
school_obj2.tell_class()