sending a list over python3 socket

Question

I have been trying for 2 days to send a list with 40,000 items which each have 3 items inside of them(its just a list in a list). I am trying to get a server to send over the list to a client so they can render it using pygame. unfortuanatly I am bad a research and existing properly so nothing has worked. I have tried pickle and json. I might have done them wrong tho.

/server.py

def threaded_client(conn):
     while True:
        conn.send(json.dumps(cubes).encode())
def  stuffs():
    while True:
        cubes = Sgeneration.cubes.list
        s.listen()
        conn,data = s.accept()
        if not conn in humans:
            humans.append(conn)
            start_new_thread(threaded_client,(conn,))
        Sgeneration.generate.draw(gameDisplay)
        pygame.display.update()
stuffs()

/generation.py

def draw(window):
    global cubes
    g = s.recv(4096)
    g = json.loads(data)

    print(type(g))
    for x in g.get("a"):
        pygame.draw.rect(window,x[2],[(x[0]*distance+offset[0]),x[1]*distance+offset[1],distance,distance])

Answer 1

I fixed it. what I did was only send the entire thing at the begging of the connection. I also sent it in small portions. When I transmitted back to every client I only sent the stuff that had changed. This suprisingly worked. took a while.