Join bytes in Python

def run_server():
    HOST = ''
    PORT = 11000
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.bind((HOST, PORT))
    s.listen(10)

    while True:
        conn, addr = s.accept()
        print("{0} - ".format(get_counter()) + 'Connection from : {0}'.format(addr))

        data_recv=conn.recv(1024)
        data=bytearray()

        conn.settimeout(1)

        while len(data_recv)&gt;0:
            data.extend(data_recv)
            try:
                data_recv=conn.recv(1024)
            except socket.timeout:
                break

        data=str(data)
        if data=="1":
            message=get_message1()
            conn.sendall(message)
        conn.close()

References :

http://stackoverflow.com/questions/9099145/where-are-python-bytearrays-used