server.py

# Echo server program
import socket
import sys

HOST = socket.gethostname()
PORT = 50007
RUN = True

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((HOST, PORT))
s.listen(1)
conn, addr = s.accept()
print 'Connected by', addr

grid = [0,0,0, 0,0,0, 0,0,0]
# Draw grid
def drawGrid():
    for y in xrange(0, 3):
        for x in xrange(0, 3):
            if x != 0: print("|"),
            if grid[3*y+x] == 1: print("X"),
            elif grid[3*y+x] == 2: print("O"),
            else: print(" "),
        print"\n"
# Update grid
def updateGrid(userIn, player):
    if userIn == None:
        userIn = sys.stdin.readline()
        print # solves a formatting issue
    if userIn == "kill\n":
        print "Bye!"
        conn.sendall("kill\n")
        conn.close()
        sys.exit()
    elif userIn == "reset\n":
        print "Restarting game!"
        for i in xrange(0,9):
            grid[i] = 0
    else:
        try:
            x = int(userIn[0])
            y = int(userIn[2])
            msg = userIn[4:]
            loc = (y-1)*3 + (x-1)
            if grid[loc] == 0 and loc<10:
                grid[loc] = player
            else:
                print("This field is no good, you dummy!\n>>"),
                return None
            if len(msg)>2: print "Player says: %s" % msg
        except:
            print("Whoops, I could not parse that! Please try again.\n>>"),
            return None
    return userIn

while RUN:
    drawGrid()
    data = conn.recv(1024)
    updateGrid(data, 2)
    print "Your turn, sir:"
    drawGrid()
    print(">>"),
    userIn = updateGrid(None, 1)
    while userIn == None:
        userIn = updateGrid(None, 1)
    conn.sendall(userIn)

conn.close()