Prototype Pattern

prototype.py

from copy import deepcopy


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

    def register_object(self, name, obj):
        '''Store an object so it can be cloned later'''
        self._objects[name] = obj

    def unregister_object(self, name):
        '''Removes an object from our store'''
        del self._objects[name]

    def clone(self, name, **attr):
        '''clone a registered object and add/replace attributes'''
        obj = deepcopy(self._objects[name])
        obj.__dict__.update(attr)
        return obj


class Test:
    first_name = None


prototype = Prototype()
test1 = Test()
test1.first_name = "John"
print(test1.first_name)
prototype.register_object('John', test1)
test2 = prototype.clone('John', first_name='Sam')
print(test2.first_name)