Python Server Client WinError 10057

Question

I'm making a server and client in Python 3.3 using the socket module. My server code is working fine, but this client code is returning an error. Here's the code:

import socket
import sys
import os

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
server_address = ('192.168.1.5', 4242)
sock.bind(server_address)

while True:
    command = sock.recv(1024)
    try:
        os.system(command)
        sock.send("yes")
    except:
        sock.send("no")

And here's the error:

Error in line: command = sock.recv(1024)
OSError: [WinError 10057] A request to send or receive data was disallowed because the socket is not connected  and (when sending on a datagram socket using a sendto call) no address was supplied

What on earth is going on?

Solution

It looks like you're confused about when you actually connect to the server, so just remember that you always bind to a local port first. Therefore, this line:

server_address = ('192.168.1.5', 4242)

Should actually read:

server_address = ('', 4242)

Then, before your infinite loop, put in the following line of code:

sock.connect(('192.168.1.5', 4242))

And you should be good to go. Good luck!

EDIT: I suppose I should be more careful with the term "always." In this case, you want to bind to a local socket first.