python练习题-day26

#bim（property）
class People:
    def __init__(self,name,weight,height):
        self.name=name
        self.weight=weight
        self.height=height
    @property
    def bim(self):
        return self.weight/(self.height**2)

#property setter deleter
class Foo:
    def __init__(self,val):
        self.__NAME=val
    @property
    def name(self):
        return self.__NAME
    @name.setter
    def name(self,value):
        self.__NAME=value
    @name.deleter
    def name(self):
        del self.__NAME

#classmethod
class Goods:
    __discount=0.8
    def __init__(self,name,price):
        self.name = name
        self.__price = price
    @property
    def price(self):
        return self.__price * Goods.__discount
    @classmethod
    def change_discount(cls,new_discount):
        Goods.__discount=new_discount
apple=Goods("apple",10)
print(apple.price)
Goods.change_discount(0.9)
print(apple.price)

#反射
class Teacher:
    dic={"查看学生信息":"","查看老师信息":""}
    def __init__(self):pass
    @classmethod
    def class_method(cls):
        print("test")
if hasattr(Teacher,"class_method"):
    getattr(Teacher,"class_method")()

print(getattr(Teacher,"dic"))