classmethod练习

# class Cou:
#     __discount=0.8
#     def __init__(self):
#         self.price=5
#         self.price=self.price*self.__discount
#     @property
#     def nowdiscount(self):
#         print(Cou.__discount)
#     @nowdiscount.setter
#     def nowdiscount(self,newdiscount):
#         Cou.__discount=newdiscount
# appele=Cou()
# print(appele.price)
# appele.nowdiscount
# appele.nowdiscount=0.5
# appele=Cou()
# appele.nowdiscount
# print(appele.price)




# class A:
#     __discount=0.8
#     def __init__(self,price):
#         self.price=A.__discount*price
#     def changweight(self,newdiscount):
#         A.__discount=newdiscount
# a=A(10)
# print(a.price)
# a.changweight(0.6)
# a=A(10)
# print(a.price)

# #classmethod
# class A:
#     __discount=0.8
#     def __init__(self,price):
#         self.price=A.__discount*price
#     @classmethod
#     def changediscount(cls,newdiscount):
#         cls.__discount=newdiscount
# a=A(10)
# print(a.price)
# a.changediscount(0.6)
# # A.changediscount(0.6)
# a=A(10)
# print(a.price)
# import time
# class Date:
#     def __init__(self,year,month,day):
#         self.year = year
#         self.month = month
#         self.day = day
#     @classmethod
#     def today(cls):
#         date=cls(time.localtime().tm_year,time.localtime().tm_mon,time.localtime().tm_mday)
#         return date
# print(Date.today().year)
# print(Date.today().month)
# print(Date.today().day)