Крестики - нолики на tkinter

from tkinter import *

flag = False
winner = False


def hod():
    global flag
    flag = not flag
    if flag:
        return 'x'
    else:
        return 'o'


def f():

    xo = Tk()
    but = Button(xo, text=" ", width=10, height=5, font="Arial 16",
                 bg="White", fg="Black", command=lambda: p(but))

    but2 = Button(xo, text=" ", width=10, height=5, font="Arial 16",
                  bg="White", fg="Black", command=lambda: p(but2))

    but3 = Button(xo, text=" ", width=10, height=5, font="Arial 16",
                  bg="White", fg="Black", command=lambda: p(but3))

    but4 = Button(xo, text=" ", width=10, height=5, font="Arial 16",
                  bg="White", fg="Black", command=lambda: p(but4))

    but5 = Button(xo, text=" ", width=10, height=5, font="Arial 16",
                  bg="White", fg="Black", command=lambda: p(but5))

    but6 = Button(xo, text=" ", width=10, height=5, font="Arial 16",
                  bg="White", fg="Black", command=lambda: p(but6))

    but7 = Button(xo, text=" ", width=10, height=5, font="Arial 16",
                  bg="White", fg="Black", command=lambda: p(but7))

    but8 = Button(xo, text=" ", width=10, height=5, font="Arial 16",
                  bg="White", fg="Black", command=lambda: p(but8))

    but9 = Button(xo, text=" ", width=10, height=5, font="Arial 16",
                  bg="White", fg="Black", command=lambda: p(but9))

    but.grid(row=1, column=1)
    but2.grid(row=1, column=2)
    but3.grid(row=1, column=3)
    but4.grid(row=2, column=1)
    but5.grid(row=2, column=2)
    but6.grid(row=2, column=3)
    but7.grid(row=3, column=1)
    but8.grid(row=3, column=2)
    but9.grid(row=3, column=3)

    def p(button):
        if button["text"] == " " and not winner:
            button["text"] = hod()
            win()

    def win():
        global winner

        if but['text'] == but2['text'] == but3['text'] and but['text'] != ' ':
            but['bg'] = 'red'
            but2['bg'] = 'red'
            but3['bg'] = 'red'
            winner = True

        if but4['text'] == but5['text'] == but6['text'] and but4['text'] != ' ':
            but4['bg'] = 'red'
            but5['bg'] = 'red'
            but6['bg'] = 'red'
            winner = True

        if but7['text'] == but8['text'] == but9['text'] and but7['text'] != ' ':
            but7['bg'] = 'red'
            but8['bg'] = 'red'
            but9['bg'] = 'red'
            winner = True

        if but['text'] == but4['text'] == but7['text'] and but['text'] != ' ':
            but['bg'] = 'red'
            but4['bg'] = 'red'
            but7['bg'] = 'red'
            winner = True

        if but2['text'] == but5['text'] == but8['text'] and but2['text'] != ' ':
            but2['bg'] = 'red'
            but5['bg'] = 'red'
            but8['bg'] = 'red'
            winner = True

        if but3['text'] == but6['text'] == but9['text'] and but3['text'] != ' ':
            but3['bg'] = 'red'
            but6['bg'] = 'red'
            but9['bg'] = 'red'
            winner = True

        if but['text'] == but5['text'] == but9['text'] and but['text'] != ' ':
            but['bg'] = 'red'
            but5['bg'] = 'red'
            but9['bg'] = 'red'
            winner = True

        if but3['text'] == but5['text'] == but7['text'] and but3['text'] != ' ':
            but3['bg'] = 'red'
            but5['bg'] = 'red'
            but7['bg'] = 'red'
            winner = True

    xo.mainloop()


f()