import socketimport contextlib@contextlib.contextmanagerdef con(host,port):    sk = socket.socket()    sk.bind((host,port))    sk.listen(5)    try:        print ("auto connect")        yield        print ("============")    finally:        print ("finally close")        sk.close()with con(‘127.0.0.1‘,8888) as sock:    print ("sock auto close")
执行结果：

auto connectsock auto close============finally close