几处费解的知识点

class School(object):
    def __init__(self,name,address):#创建类后初始化，self的出现就把后边的name和address包含在肚子里，所以在这个程序中只要被使用就包含name和address功能
        self.name = name
        self.address = address
        self.teacher = []
        self.student = []
    def enroll(self,stu_obj):  #出现self则说明后边的stu_obj就可以直接使用stu_obj.name
        self.student.append(stu_obj)
        print("%s 注册学籍" %stu_obj.name)
    def hire(self,tea_obj):   #出现self则说明后边的stu_obj就可以直接使用tea_obj.name  还有就是tea_obj是在self肚子中已有功能的添加
        self.teacher.append(tea_obj)
        print("%s 被雇佣" % tea_obj.name)

class Schoolmates(object):
    def __init__(self,name,age,sex):
        self.name = name
        self.age = age
        self.sex = sex

class Teacher(Schoolmates):
    def __init__(self,name,age,sex,gongzi,kecheng):
        Schoolmates.__init__(self,name,age,sex)
        self.gongzi = gongzi
        self.kecheng = kecheng
    def teach(self):
        print("%s is teaching %s" %(self.name,self.kecheng))
    def tell(self):
        print('''----- info teacher %s -----
       name = %s
       age = %s
       sex = %s
       gongzi = %s
       kecheng = %s''' %(self.name,self.name,self.age,self.sex,self.gongzi,self.kecheng))
class Student(Schoolmates):
    def __init__(self,name,age,sex,tuition,grade):
        Schoolmates.__init__(self,name,age,sex)
        self.tuition = tuition
        self.grade = grade
    def pay_tuition(self,amount):
        print("%s has paid %s" %(self.name,amount))
    def tell(self):
        print('''----- info student %s -----
       name = %s
       age = %s
       sex = %s
       tuition = %s
       grade = %s''' %(self.name,self.name,self.age,self.sex,self.tuition,self.grade))


school= School("zjut","hangzhou")
t1 = Teacher("老郭",40,"男",4000,"math")
s1 = Student("小明",21,"男",5000,5)

t1.tell()
s1.tell()
school.enroll(s1)
school.hire(t1)