Programa Juego del gato en python

from Tkinter import *
import tkMessageBox
import tkSimpleDialog


def bloq():
    for i in range(0, 9):
        lisb[i].config(state="disable")


def inij():
    for i in range(0, 9):
        lisb[i].config(state="normal")
        lisb[i].config(bg="lightgray")
        lisb[i].config(text="")
        tab[i] = "N"
    global nomj1, nomj2  # indica a que variables queremos acceder
    nomj1 = tkSimpleDialog.askstring("Jugador", "Nombre del jugador 1: ")
    nomj2 = tkSimpleDialog.askstring("Jugador", "Nombre del jugador 2: ")
    turj.set("Turno: " + nomj1)


def cam(num):
    global turno, nomj1, nomj2
    if tab[num] == "N" and turno == 0:
        lisb[num].config(text="X")
        lisb[num].config(bg="pink")
        tab[num] = "X"
        turno = 1
        turj.set("Turno: " + nomj2)
    elif tab[num] == "N" and turno == 1:
        lisb[num].config(text="O")
        lisb[num].config(bg="lightblue")
        tab[num] = "O"
        turno = 0
        turj.set("Turno: " + nomj1)
    lisb[num].config(state="disable")
    verif()


def verif():
    if (tab[0] == "X" and tab[1] == "X" and tab[2] == "X") or (tab[3] == "X" and tab[4] == "X" and tab[5] == "X") or (
                tab[6] == "X" and tab[7] == "X" and tab[8] == "X"):
        bloq()
        tkMessageBox.showinfo("Ganaste", "Ganaste jugador: " + nomj1)
    elif (tab[0] == "X" and tab[3] == "X" and tab[6] == "X") or (tab[1] == "X" and tab[4] == "X" and tab[7] == "X") or (
                tab[2] == "X" and tab[5] == "X" and tab[8] == "X"):
        bloq()
        tkMessageBox.showinfo("Ganaste", "Ganaste jugador: " + nomj1)
    elif (tab[0] == "X" and tab[4] == "X" and tab[8] == "X") or (tab[2] == "X" and tab[4] == "X" and tab[6] == "X"):
        bloq()
        tkMessageBox.showinfo("Ganaste", "Ganaste jugador: " + nomj1)
    elif (tab[0] == "O" and tab[1] == "O" and tab[2] == "O") or (tab[3] == "O" and tab[4] == "O" and tab[5] == "O") or (
                tab[6] == "O" and tab[7] == "O" and tab[8] == "O"):
        bloq()
        tkMessageBox.showinfo("Ganaste", "Ganaste jugador: " + nomj2)
    elif (tab[0] == "O" and tab[3] == "O" and tab[6] == "O") or (tab[1] == "O" and tab[4] == "O" and tab[7] == "O") or (
                tab[2] == "O" and tab[5] == "O" and tab[8] == "O"):
        bloq()
        tkMessageBox.showinfo("Ganaste", "Ganaste jugador: " + nomj2)
    elif (tab[0] == "O" and tab[4] == "O" and tab[8] == "O") or (tab[2] == "O" and tab[4] == "O" and tab[6] == "O"):
        bloq()
        tkMessageBox.showinfo("Ganaste", "Ganaste jugador: " + nomj2)


ven = Tk()
ven.geometry("370x460")
ven.title("Juego del gato")
turno = 0

nomj1 = ""
nomj2 = ""

lisb = []
tab = []
turj = StringVar()

for i in range(0, 9):
    tab.append("N")

b0 = Button(ven, width=9, height=3, relief=SOLID, command=lambda: cam(0))
lisb.append(b0)
b0.place(x=50, y=50)
b1 = Button(ven, width=9, height=3, relief=SOLID,  command=lambda: cam(1))
lisb.append(b1)
b1.place(x=150, y=50)
b2 = Button(ven, width=9, height=3, relief=SOLID,  command=lambda: cam(2))
lisb.append(b2)
b2.place(x=250, y=50)
b3 = Button(ven, width=9, height=3, relief=SOLID,  command=lambda: cam(3))
lisb.append(b3)
b3.place(x=50, y=150)
b4 = Button(ven, width=9, height=3, relief=SOLID,  command=lambda: cam(4))
lisb.append(b4)
b4.place(x=150, y=150)
b5 = Button(ven, width=9, height=3, relief=SOLID,  command=lambda: cam(5))
lisb.append(b5)
b5.place(x=250, y=150)
b6 = Button(ven, width=9, height=3, relief=SOLID,  command=lambda: cam(6))
lisb.append(b6)
b6.place(x=50, y=250)
b7 = Button(ven, width=9, height=3, relief=SOLID,  command=lambda: cam(7))
lisb.append(b7)
b7.place(x=150, y=250)
b8 = Button(ven, width=9, height=3, relief=SOLID,  command=lambda: cam(8))
lisb.append(b8)
b8.place(x=250, y=250)
tue = Label(ven, textvariable=turj).place(x=140, y=10)
bini = Button(ven, bg='pink', fg='black', text='Iniciar juego', width=20, height=2,
              command=inij).place(x=130, y=360)
bloq()

linea = Canvas(ven, width=310, height=10)
linea.place(x=30, y=120)
linea.create_line(310, 0, 0, 0, width=25, fill='purple')
l2 = Canvas(ven, width=310, height=10)
l2.place(x=30, y=220)
l2.create_line(310, 0, 0, 0, width=25, fill='purple')
l3 = Canvas(ven, width=10, height=310)
l3.place(x=130, y=25)
l3.create_line(0, 310, 0, 0, width=25, fill='purple')
l4 = Canvas(ven, width=10, height=310)
l4.place(x=230, y=25)
l4.create_line(0, 310, 0, 0, width=25, fill='purple')

ven.mainloop()