Singleton Pattern in Python

single.py

class HTTPClient(object):
    _inst = None
    def __new__(cls):
        if cls._inst:
            return cls._inst
        else:
            o = super(HTTPClient, cls).__new__(cls)
            cls._inst = o
            return o

if __name__ == '__main__' :
    obj1 = HTTPClient()
    obj2 = HTTPClient()
    assert(obj1, obj2)