def begin_packet(self, packet_type):
        self._type = packet_type
        self._pos = 8
Similar to self._send, but doesn't try to initiate a connection,
dataset/ETHPy150Open denisenkom/pytds/pytds/tds.py/_TdsWriter.begin_packet--crossover with--dataset/ETHPy150Open basho/riak-python-client/riak/transports/tcp/connection.py/TcpConnection._non_connect_send_msg