GoF design pattern with Python - Prototype

prototype.py

# -*- coding: utf-8 -*-

import copy

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

	def register_object(self, name, obj):
		"""Register an object"""
		self._objects[name] = obj

	def unregister_object(self, name):
		"""Unregister an object"""
		del self._objects[name]

	def clone(self, name, **attr):
		"""Clone a registered object and update inner attributes dictionary"""
		obj = copy.deepcopy(self._objects.get(name))
		obj.__dict__.update(attr)
		return obj

def main():
	class A:
		pass

	a = A()
	prototype = Prototype()
	prototype.register_object('a', a)
	b = prototype.clone('a', a=1, b=2, c=3)

	print(a)
	print(b.a, b.b, b.c)

if __name__ == '__main__':
	main()