class Memo(type):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.__cache = {}
def __new__(cls, *args, **kwargs):
return type.__new__(cls, *args, **kwargs)
def __call__(self, _id, *args, **kwargs):
if _id not in self.__cache:
self.__cache[_id] = super().__call__(_id, *args, **kwargs)
else:
print("Existing Instance")
return self.__cache[_id]
class Foo(metaclass=Memo):
def __init__(self, _id, *args, **kwargs):
self.id = _id
def test():
first = Foo(_id="first")
second = Foo(_id="first")
print(id(first) == id(second))
if __name__ == '__main__':
test()
