多态与多态性 简单的“__”封装

基于多态的概念来实现linux中一切皆问题的概念:文本文件，进程，磁盘都是文件，然后验证多态性
class File:
    def read(self):
        raise AttributeError("此功能必须实现")
    def write(self):
        raise AttributeError("此功能必须实现")
class Txt(File):
    def read(self):
        print("Txt start to read")
    def write(self):
        print("Txt start to write")
class Progress(File):
    def read(self):
        print("Progress start to read")
    def write(self):
        print("Progress start to write")
class Sata(File):
    def read(self):
        print("Sata start to read")
    def write(self):
        print("Sata start to write")
s=Sata()
def fuc_read(obj):
    obj.read()
def fuc_write(obj):
    obj.write()
fuc_read(s)

定义老师类，把老师的属性：薪资，隐藏起来，然后针对该属性开放访问接口
苑昊老师有多种癖好，把这种癖好隐藏起来，然后对外提供访问接口
而且以后还会苑昊老师培养很多其他的癖好，对外开放修改接口，可以新增癖好，并且需要保证新增的癖好都是字符串类型，否则无法增加成功。

class Teacher:
    def __init__(self,name,age,salary,hobbys,*args):
        self.name=name
        self.age=age
        self.__salary=salary
        self.__hobby=[hobbys,*args]
    def search_salary(self):
        print("%s salary is %s"%(self.name,self.__salary))
    def search_hobby(self):
        print("%s hobby is %s"%(self.name,self.__hobby))
    def hobby_append(self,hobby_app):
        if type(hobby_app)==str:
            self.__hobby.append(hobby_app)
            print("%s append success"%hobby_app)
        else:
            print("hobby_app type is error")
t=Teacher("苑浩",22,50000,"Fuck","Tian")
t.hobby_append("Cha")
t.hobby_append(1)
t.search_hobby()
t.search_salary()