def send(socket, data, num_bytes=20):
    """Send data to specified socket.


    :param socket: open socket instance
    :param data: data to send
    :param num_bytes: number of bytes to read

    :return: received data
    """
    pickled_data = pickle.dumps(data, -1)
    length = str(len(pickled_data)).zfill(num_bytes)
    socket.sendall(length.encode())
    socket.sendall(pickled_data)