Multiple constructors with different number of arguments

Here is a version that does not leak memory and supports wrapping multiple classes.

Metaclass:

import weakrefclass MyMeta(type):    def __init__(self, *args, **kwargs):        self.__instances = {}        super(MyMeta, self).__init__(*args, **kwargs)    def get_instances(self):        retu list(self.__instances.values())    def delete(self, id_instance):