Python中如何实现原型模式？

import copy

class Prototype:
    def __init__(self):
        self._objects = {}

    def register_object(self, name, obj):
        self._objects[name] = obj

    def clone(self, name, **attr):
        obj = copy.copy(self._objects.get(name))
        obj.__dict__.update(attr)
        return obj

class Car:
    def __init__(self, model, year):
        self.model = model
        self.year = year

    def __str__(self):
        return f"{self.year} {self.model}"

# 使用原型模式
prototype = Prototype()
car1 = Car("Toyota", 2020)
prototype.register_object("car1", car1)

# 克隆一个新的车，修改其属性
car2 = prototype.clone("car1", year=2021)
print(car1)  # 输出: 2020 Toyota
print(car2)  # 输出: 2021 Toyota

import copy

class Address:
    def __init__(self, street, city):
        self.street = street
        self.city = city

    def __str__(self):
        return f"{self.street}, {self.city}"

class Person:
    def __init__(self, name, address):
        self.name = name
        self.address = address

    def __str__(self):
        return f"{self.name}, {self.address}"

# 创建原型对象
address = Address("123 Main St", "Anytown")
person = Person("John Doe", address)

# 使用深拷贝克隆对象
cloned_person = copy.deepcopy(person)

# 修改克隆对象的地址
cloned_person.address.street = "456 Elm St"

print(person)  # 输出: John Doe, 123 Main St, Anytown
print(cloned_person)  # 输出: John Doe, 456 Elm St, Anytown