How do I send a message to all client threads in my TCP IP server in Python? -

i'm trying build tcp ip server in python. goal run commands on clients. run command you'll have type "cmd command" in server. i've never worked threads before , can't seem find out how send command want execute client threads. point me in right direction?

my code far:

    import socket     import sys     thread import *      host = ''     port = 8884     clients = 0     connected_id = ""      s = socket.socket(socket.af_inet, socket.sock_stream)     print 'socket created'      # bind socket local host , port     try:         s.bind((host, port))     except socket.error, msg:         print 'bind failed. error code : ' + str(msg[0]) + ' message ' + msg[1]         sys.exit()      print 'socket binded'      # start listening on socket     s.listen(10)     print 'socket listening'       # function handling connections.     def clientthread(conn):         # sending message connected client         conn.sendall('hello')  # send takes string         global clients         # loop until disconnect         while true:             # receiving client             data = conn.recv(1024)             if data.lower().find("id=-1") != -1:                 clients += 1                 print("new client id set " + str(clients))                 conn.sendall("sid=" + str(clients))             if not data:                 break          # if client disconnects         conn.close()      def addclientsthread(sock):         # start new thread takes 1st argument function name run, second tuple of arguments function         conn, addr = sock.accept()         print('client connected on ' + addr[0])         start_new_thread(clientthread, (conn,))      def sendallclients(message):          # send msg clients         tmp = 0      # keep talking clients     start_new_thread(addclientsthread, (s,))     usr_input = ""     while str(usr_input) != "q":         # stuff         usr_input = raw_input("enter 'q' quit")         if usr_input.find("cmd") == 0:             sendallclients(usr_input[3:])         if usr_input.find("hi") == 0:             sendallclients("hey")     s.close() 

first make clients list :

my_clients = []  

then modify addclientsthread add new clients list :

def addclientsthread(sock):      global my_clients     conn, addr = sock.accept()     my_clients += [conn]     print('client connected on ' + addr[0])     start_new_thread(clientthread, (conn,)) 

next iterate on my_clients in sendallclients function :

def sendallclients(message):      client in my_clients :          client.send(message) 

now clients should receive message