Kamień, Papier, Nożyce

import random
import sys

symbols = ['Papier', 'Kamień', 'Nożyce']

def start_game():
    print('Witaj w grze Kamień, papier, nożyce.')
    player_choice = input('Podaj symbol(Kamień[K], Papier[P], Nożyce[N]): ')
    cpu_choice = random.choice(symbols)
    print('Twoj przeciwnik wybral:', cpu_choice)

    who_win(cpu_choice ,player_choice)

def who_win(cpu_choice, player_choice):
    if cpu_choice == player_choice:
        result = 'tie'
    if player_choice == 'K':
        if cpu_choice == 'Papier':
            result = 'lose'
        elif cpu_choice == 'Nożyce':
            result = 'win'
    if player_choice == 'P':
        if cpu_choice == 'Kamień':
            result = 'win'
        elif cpu_choice == 'Nożyce':
            result = 'lose'
    if player_choice == 'N':
        if cpu_choice == 'Kamień':
            result = 'lose'
        elif cpu_choice == 'Papier':
            result = 'win'

    wynik(result)

def wynik(result):
    player_score = 0
    cpu_score = 0
    if result == 'tie':
        print('Remis.')
    elif result == 'lose':
        print('Przegrałeś')
        cpu_score += 1
    elif result == 'win':
        print('Wygrałeś')
        player_score += 1

    print('Komputer:',cpu_score, 'Gracz:', player_score)
    play_again()

def play_again():
    play_again = input('Jeżeli chcesz zagrać ponownie napisz T, w przeciwnym razie napisz N: ')
    if play_again == 'T':
        print('**********************************************')
        start_game()
    elif play_again == 'N':
        sys.exit()

start_game()