python程序设计——面向对象程序设计：继承

# 定义基类
class Person(object):    # 必须以object为基类
    def __init__(self,name=‘‘,age=20,sex=‘man‘):
        self.setName(name)
        self.setAge(age)
        self.setSex(sex)
        
    def setName(self,name):
        if not isinstance(name,str):
            print(‘name must be string.‘)
            return
        self.__name=name
        
    def setAge(self,age):
        if not isinstance(age,int):
            print(‘age must be integer.‘)
            return
        self.__age=age
        
    def setSex(self,sex):
        if sex != ‘man‘ and sex != ‘woman‘:
            print(‘sex must be "man" or "woman".‘)
            return
        self.__sex = sex
        
    def show(self):
        print(‘name:‘,self.__name)
        print(‘age:‘,self.__age)
        print(‘sex:‘,self.__sex)


# 定义派生类，并调用基类方法
class Teacher(Person):
    def __init__(self,name=‘‘,age=30,sex=‘man‘,id=215):
        super(Teacher,self).__init__(name,age,sex)
        self.setId(id)
        
    def setId(self,id):
        if not isinstance(id,int):
            print(‘id must bu integer.‘)
            return
        self.__id = id
    
    def show(self):
        super(Teacher,self).show()    # 调用基类的方法
        print()
        
if __name__==‘__main__‘:
    zhangle = Person(‘zhang le‘,19,‘man‘)
    zhangle.show()
    limu = Teacher(‘li mu‘,32,‘man‘,233)
    limu.show()
    limu.setId(666)
    limu.show()

out:

name: zhang le
age: 19
sex: man
name: li mu
age: 32
sex: man

name: li mu
age: 32
sex: man