# encoding: utf-8
# 版权所有 2026 ©涂聚文有限公司™ ®
# 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎
# 描述： Memento Pattern
# Author : geovindu,Geovin Du 涂聚文.
# IDE : PyCharm 2024.3.6 python 3.11
# os : windows 10
# database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j
# Datetime : 2026/2/12 23:22
# User : geovindu
# Product : PyCharm
# Project : pydesginpattern
# File : JewelryMemento.pyimport sys
from threading import settraceclass JewelryMemento(object):"""备忘录类：存储珠宝的状态"""'''#此法也可以def __init__(self, name: str, material: str, price: float, is_inlaid: bool):"""私有属性，仅允许原发器访问:param name::param material::param price::param is_inlaid:"""self.__name = nameself.__material = materialself.__price = priceself.__is_inlaid = is_inlaid'''def __init__(self):"""私有属性，仅允许原发器访问:param name::param material::param price::param is_inlaid:"""self.__name = Noneself.__material = Noneself.__price = Noneself.__is_inlaid = None# 提供只读的访问方法（仅原发器使用）@propertydef name(self)->str:""":return:"""return self.__name@name.setterdef name(self,name:str):""":param name::return:"""self.__name = name@propertydef material(self)->str:""":return:"""return self.__material@material.setterdef material(self,material:str):""":param material::return:"""self.__material = material@propertydef price(self)->float:""":return:"""return self.__price@price.setterdef price(self,price:float):""":param price::return:"""self.__price = price@propertydef is_inlaid(self)->bool:""":return:"""return self.__is_inlaid@is_inlaid.setterdef is_inlaid(self,is_inlaid):""":param is_inlaid::return:"""self.__is_inlaid = is_inlaid# encoding: utf-8
# 版权所有 2026 ©涂聚文有限公司™ ®
# 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎
# 描述： Memento Pattern
# Author : geovindu,Geovin Du 涂聚文.
# IDE : PyCharm 2024.3.6 python 3.11
# os : windows 10
# database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j
# Datetime : 2026/2/12 23:30
# User : geovindu
# Product : PyCharm
# Project : pydesginpattern
# File : JewelryCaretaker.pyfrom MementoPattern.JewelryMemento import JewelryMementoclass JewelryCaretaker(object):"""负责人类：管理珠宝备忘录的存储和获取"""def __init__(self):# 用列表存储多个备忘录（支持恢复到多个历史状态）self.__mementos = []def save_memento(self, memento: JewelryMemento):"""保存备忘录:param memento::return:"""self.__mementos.append(memento)print(f"\n已保存第 {len(self.__mementos)} 个版本的珠宝状态")def get_memento(self, index: int) -> JewelryMemento:"""获取指定索引的备忘录:param index::return:"""if 0 <= index < len(self.__mementos):return self.__mementos[index]raise IndexError("备忘录索引超出范围")# encoding: utf-8
# 版权所有 2026 ©涂聚文有限公司™ ®
# 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎
# 描述： Memento Pattern
# Author : geovindu,Geovin Du 涂聚文.
# IDE : PyCharm 2024.3.6 python 3.11
# os : windows 10
# database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j
# Datetime : 2026/2/12 23:25
# User : geovindu
# Product : PyCharm
# Project : pydesginpattern
# File : Jewelry.pyfrom MementoPattern.JewelryMemento import JewelryMementoclass Jewelry(object):"""原发器类：珠宝实体对象"""'''#此法也可以def __init__(self, name: str, material: str, price: float, is_inlaid: bool):""":param name: 珠宝名称:param material: 材质（黄金、钻石、铂金等）:param price: 价格:param is_inlaid: 是否镶嵌宝石"""self.name = name"""珠宝名称"""self.material = material"""材质（黄金、钻石、铂金等）"""self.price = price"""价格"""self.is_inlaid = is_inlaid"""是否镶嵌宝石"""'''def __init__(self, jwelry:JewelryMemento):""":param jwelry:"""self.name = jwelry.name"""珠宝名称"""self.material = jwelry.material"""材质（黄金、钻石、铂金等）"""self.price = jwelry.price"""价格"""self.is_inlaid = jwelry.is_inlaidself.object=jwelry"""是否镶嵌宝石"""def create_memento(self) -> JewelryMemento:"""创建备忘录：保存当前珠宝的状态:return:"""obj = JewelryMemento()obj.name = self.nameobj.material = self.materialobj.price = self.priceobj.is_inlaid = self.is_inlaidreturn obj # 相应上法也可以用： JewelryMemento(self.name, self.material, self.price, self.is_inlaid)def restore_from_memento(self, memento: JewelryMemento):"""从备忘录恢复珠宝状态:param memento::return:"""self.name = memento.nameself.material = memento.materialself.price = memento.priceself.is_inlaid = memento.is_inlaiddef show_status(self):"""显示当前珠宝状态:return:"""formatted_number = self.pricestatus= "珠宝信息： \n 名称：{0} \n 材质：{1} \n 价格：{2} 元 \n 是否镶嵌宝石：{3}".format(self.name,self.material,formatted_number,'是' if self.is_inlaid else '否') # '是' if self.is_inlaid else '否'print(status)
调用：
# encoding: utf-8
# 版权所有 2026 ©涂聚文有限公司™ ®
# 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎
# 描述： Memento Pattern
# Author : geovindu,Geovin Du 涂聚文.
# IDE : PyCharm 2024.3.6 python 3.11
# os : windows 10
# database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j
# Datetime : 2026/2/12 23:22
# User : geovindu
# Product : PyCharm
# Project : pydesginpattern
# File : main.pyfrom MementoPattern.JewelryMemento import JewelryMemento
from MementoPattern.Jewelry import Jewelry
from MementoPattern.JewelryCaretaker import JewelryCaretaker# Press the green button in the gutter to run the script.
if __name__ == '__main__':# 1. 创建初始珠宝对象jewelry = JewelryMemento()jewelry.name="钻石戒指"jewelry.material = "铂金",jewelry.price = 19999.99,jewelry.is_inlaid = Truediamond_ring=Jewelry(jewelry)print("=== 初始状态 ===")diamond_ring.show_status()'''diamond_ring = Jewelry(name="钻石戒指",material="铂金",price=19999.99,is_inlaid=True)print("=== 初始状态 ===")diamond_ring.show_status()'''# 2. 创建负责人并保存初始状态caretaker = JewelryCaretaker()caretaker.save_memento(diamond_ring.create_memento())# 3. 修改珠宝状态（调价+更换材质）diamond_ring.price = 22999.99diamond_ring.material = "18K金"print("\n=== 修改后状态 ===")diamond_ring.show_status()caretaker.save_memento(diamond_ring.create_memento())# 4. 再次修改状态（取消镶嵌）diamond_ring.is_inlaid = Falsediamond_ring.name = "简约戒指"print("\n=== 再次修改后状态 ===")diamond_ring.show_status()# 5. 恢复到第一个版本（初始状态）print("\n=== 恢复到初始状态 ===")diamond_ring.restore_from_memento(caretaker.get_memento(0))diamond_ring.show_status()# 6. 恢复到第二个版本（第一次修改后的状态）print("\n=== 恢复到第一次修改后的状态 ===")diamond_ring.restore_from_memento(caretaker.get_memento(1))diamond_ring.show_status()
输出：
