求助：AttributeError: 'Event' object has no attribute 'key'

用python3.0和pycharm编程，代码如下：

import sys

import pygame

def check_event(ship):
    """响应按键和鼠标事件"""
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_RIGHT:
                ship.moving_right = True
            elif event.key == pygame.K_LEFT:
                ship.moving_left = True
        elif event.key == pygame.KEYUP:
            if event.key == pygame.K_RIGHT:
                ship.moving_right = False
            elif event.key == pygame.K_LEFT:
                ship.moving_left = False


def update_screen(ai_settings, screen, ship):
    """更新屏幕上的图像，并切换到新屏幕"""
    screen.fill(ai_settings.bg_color)
    ship.blitme()

    # 让最近绘制的屏幕可见
    pygame.display.flip()