import weakref
import copy 

class Card(object):

	_CardPool = weakref.WeakValueDictionary()

	def __new__(cls, value, suit, **kwargs):
		obj = Card._CardPool.get(value + suit, None)
		if not obj:
			obj = object.__new__(cls)
			obj.value, obj.suit = value, suit
			Card._CardPool[value + suit] = obj
		return obj


class MyObj(object):
	def __init__(self, value, suit):
		super(MyObj, self).__setattr__('_internal', Card(value, suit))

	def __setattr__(self, name, new_value):
		vals = self._internal.__dict__
		if name in vals.keys():
			vals = vals.copy()
			vals[name] = new_value
			card = Card(**vals)
			super(MyObj, self).__setattr__('_internal', card)
		else:
			super(MyObj, self).__setattr__(name, new_value)

	def __getattr__(self, name):
		try:
			return getattr(self._internal, name)
		except AttributeError:
			raise AttributeError("'MyObj' object has no attribute '%s'" % name)