Kamień, Papier, Nożyce

import sys
import random
import time

options = ['Papier', 'Kamień', 'Nożyce']
player_score = 0
cpu_score = 0

def get_winner(choice_one, choice_two):
    if choice_one == choice_two:
        result = 'tie'
    elif choice_one == options[1] and choice_two == options[0]:
        result = 'cpu_won'
    elif choice_one == options[1] and choice_two == options[2]:
        result = 'player_won'
    elif choice_one == options[0] and choice_two == options[1]:
        result = 'player_won'
    elif choice_one == options[0] and choice_two == options[2]:
        result = 'cpu_won'
    elif choice_one == options[2] and choice_two == options[1]:
        result = 'cpu_won'
    elif choice_one == options[2] and choice_two == options[0]:
        result = 'player_won'
    return result

def start_game():
    print('Kamień, Papier, Nożyce.')
    start = input("By rozpocząć gre wpisz 'start', by wyłaczyć wpisz 'zakoncz': ")
    if start == 'start' or start == 'START':
        player_select()
    elif start == 'zakoncz' or start == 'ZAKONCZ':
        sys.exit()
    else:
        print('Spróbuj ponownie. Słowo powinno być wpisane wielkimi lub małymi literami bez polskich znaków.')
        start_game()

def player_select():
    player_choice = input('Wybierz: {}, {} lub {}: '.format(options[0], options[1], options[2]))
    if player_choice == options[0] or player_choice == options[1] or player_choice == options[2]:
        cpu_select()
    else:
        print('Zła nazwa symbolu. Nazwa powinna być wpisana wielką literą z polskimi znakami.')
        player_select()

    return player_choice

def cpu_select():
    cpu_choice = random.choice(options)
    print('Twój przeciwnik wybrał:')
    time.sleep(0.5)
    print(cpu_choice)
    game_result()

    return cpu_choice

def game_result():
    result = get_winner(player_choice, cpu_choice)
    if result == 'player_won':
        print('Wygrałeś.')
        player_score += 1
    elif result == 'cpu_won':
        print('Przegrałeś.')
        cpu_score += 1
    else:
        print('Remis.')

    score_board = 'Wynik: Gracz: ' + str(player_score) + ' Komputer: ' + str(cpu_score)
    print(score_board)
    end_game()

def end_game():
    play_again = input('Gramy ponownie? Wpisz tak lub nie: ')
    if play_again == 'Tak' or play_again == 'tak':
        print('Gramy dalej.')
        game()
    elif play_again == 'Nie' or play_again == 'nie':
        print('Dziękujemy za grę.')
        sys.exit()
    else:
        print('Spróbuj ponownie.')
        end_game()

    return score_board


while True:
    start_game()