Friendpaste

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

_instances = {}

class Wrapper(object):

    def __new__(cls, **kwargs):
        instance = object.__new__(cls)
        instance.__init__(**kwargs)
        if instance.uuid in _instances:
            cached = _instances[instance.uuid]
            for attr in kwargs.items():
                setattr(cached, *attr)
            return cached
        else:
            _instances[instance.uuid] = instance
            return instance

    @property
    def uuid(self):
        raise NotImplementedError()

class Test(Wrapper):

    def __init__(self, name=None):
        self.name = name

    @property
    def uuid(self):
        return self.name

id(Test(name='toto')) == Test(name='toto')
t1 = Test(name='toto')
t2 = Test(name='toto')

print id(t1) == id(t2)
t1.name = 'tata'
print t2.name