python 任何Borg子类的所有实例都将从cmd2源代码L＃1456共享状态

Posted 2021-05-09

class Borg(object):
    '''All instances of any Borg subclass will share state.
    from Python Cookbook, 2nd Ed., recipe 6.16'''
    _shared_state = {}
    def __new__(cls, *a, **k):
        obj = object.__new__(cls, *a, **k)
        obj.__dict__ = cls._shared_state
        return obj