def change_name(id, name):
    game.name = name

def play_function(game):
    input = TextBox((400, 100, 250, 30), command=change_name, clear_on_enter=True, inactive_on_enter=False)
    while game.name is None:
        game.screen.fill(pg.Color('black'))
        name_text = label.Label(game, 400, 10, content='Enter name: ', color='white', size=40)
        name_text.draw()
        input.update()
        input.draw(game.screen)
        events = pg.event.get()
        for event in events:
            input.get_event(event)
        pg.display.update()
        game.clock.tick(config.fps)