Uhm? If I pass different parameters I want to have different instances. The Singleton behaviour is recovered only when I pass always the same arguments, in particular when I pass 0-arguments:
>>> class Foobar: ... __metaclass__ = Memoize ... >>> Foobar() <__main__.Foobar object at 0xb7defbcc> >>> Foobar() <__main__.Foobar object at 0xb7defbcc> >>> Foobar() <__main__.Foobar object at 0xb7defbcc> Of course if for Singleton you mean "whatever I pass to the constructor it must always return the same instance" then this pattern is not a Singleton. This is why I call it memoize ;) -- http://mail.python.org/mailman/listinfo/python-list
