如何在Python中从套接字读取原始字节？

我有一个Android Java应用程序通过套接字发送字节，该套接字连接到在Python中运行服务器的主机。我需要接收这些字节，因为它们是从python套接字发送的。我看到在Python中，“ socket.recv”仅返回一个字符串。当我从Java应用程序发送ASCII字符串时，我能够在python服务器中正确接收数据，但是当我使用java字节发送二进制数据时，我看到接收到的数据并不相同。我需要在Python中接收原始字节，才能使协议正常工作。请指出正确的方向。

在套接字上发送数据的代码段：

private void sendFrameMessage(byte[] data) {
        byte[] lengthInfo = new byte[4];
        Log.v(TAG, "sendFrameMessage");

        for(int i=0; i<data.length; i++) {
            Log.v(TAG, String.format("data[%d] = %d", i, data[i]));
        }

        try {
            lengthInfo[0] = (byte) data.length;
            lengthInfo[1] = (byte) (data.length >> 8);
            lengthInfo[2] = (byte) (data.length >> 16);
            lengthInfo[3] = (byte) (data.length >> 24);
            DataOutputStream dos;
            dos = new DataOutputStream(mSocket.getOutputStream());
            dos.write(lengthInfo, 0, 4);
            dos.write(data, 0, data.length);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

接收方的Python代码

def recvFrameMessage(self, s):
        recv_count = 4;
        data = s.recv(recv_count)
        if data == 0:
            return None
        total_rx = len(data)
        lenInfo = data
        while total_rx < recv_count:
            data = s.recv(recv_count - total_rx)
            if data == 0:
                return None
            total_rx += len(data)
            lenInfo = lenInfo + data

        recv_count = self.decodeFrameLen(lenInfo)
        logger.info("length = %d" % recv_count)

        data = s.recv(recv_count)
        total_rx = len(data)
        msg = data
        while total_rx < recv_count:
            data = s.recv(recv_count - total_rx)
            if data == 0:
                return None            
            total_rx += len(data)
            msg = msg + data
        logger.info("msg = " + msg)
        for i in range(0, len(msg)-1):
            logger.info("msg[%d] = %s" % (i, msg[i]))
        return msg