A thread safe implementation of singleton pattern in Python. Based on tornado.ioloop.IOLoop.instance() approach.singleton.py �Eb�U �Q;a�U import threading # Based on tornado.ioloop.IOLoop.instance() approach. # See https://github.com/facebook/tornado class SingletonMixin(object): __singleton_lock = threading.Lock() __singleton_instance = None @classmethod def instance(cls): if not cls.__singleton_instance: with cls.__singleton_lock: if not cls.__singleton_instance: cls.__singleton_instance = cls() return cl
