import socket
import threading

sock = socket.socket(socket.AF_INET, sock.SOCK_STREAM)

sock.bind(('0.0.0.0',10000))

sock.listen(1)

connections = []

def handler(c, a):
    global connections
    while True:
        data = c.recv(1024)
        for connection in connections
            connection.send(bytes(data))
        if no data:
            connections.remove(c)
            break

while True:
    c, a = sock.accept()
    cThread = threading.Thread(target=handler, args=(c,a))
    cThread.daemon = True
    cThread.start()
    connections.append(c)
    print(connections)