How to use the ctpwrapper.MdApiPy function in ctpwrapper

:param tcp:
    :return:
    """
    host_schema = urllib.parse.urlparse(tcp)

    ip = host_schema.hostname
    port = host_schema.port

    with closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as sock:
        if sock.connect_ex((ip, port)) == 0:
            return True  # OPEN
        else:
            return False  # closed


class Md(MdApiPy):
    """
    """

    def __init__(self, broker_id, investor_id, password, request_id=1):

        self.broker_id = broker_id
        self.investor_id = investor_id
        self.password = password
        self.request_id = request_id

    def OnRspError(self, pRspInfo, nRequestID, bIsLast):

        self.ErrorRspInfo(pRspInfo, nRequestID)

    def ErrorRspInfo(self, info, request_id):
        """