《python编程从入门到实践》书中的外星人入侵小游戏报错

Question

使用该书发布的附件中的参考代码在Pyhton3.7 Pycharm2019.2.4（最新版本）的环境下运行，出现报错如下：

Traceback (most recent call last):
File "F:/python_work/AI/Alien_Invasion.py", line 25, in <module>

run_game()

File "F:/python_work/AI/Alien_Invasion.py", line 21, in run_game

gf.check_evnets(ship)

AttributeError: module 'game_functions' has no attribute 'check_evnets'

使用的相关具体代码如下：（并没有贴settings.py和bullet.py）

alien_invasion.py

import pygame
from pygame.sprite import Group

from settings import Settings
from ship import Ship
import game_functions as gf

def run_game():
    # Initialize pygame, settings, and screen object.
    pygame.init()
    ai_settings = Settings()
    screen = pygame.display.set_mode(
        (ai_settings.screen_width, ai_settings.screen_height))
    pygame.display.set_caption("Alien Invasion")
    
    # Set the background color.
    bg_color = (230, 230, 230)
    
    # Make a ship.
    ship = Ship(ai_settings, screen)
    # Make a group to store bullets in.
    bullets = Group()

    # Start the main loop for the game.
    while True:
        gf.check_events(ai_settings, screen, ship, bullets)
        ship.update()
        gf.update_bullets(bullets)
        gf.update_screen(ai_settings, screen, ship, bullets)

run_game()

game_functions.py

import sys

import pygame

from bullet import Bullet


def check_keydown_events(event, ai_settings, screen, ship, bullets):
    """Respond to keypresses."""
    if event.key == pygame.K_RIGHT:
        ship.moving_right = True
    elif event.key == pygame.K_LEFT:
        ship.moving_left = True
    elif event.key == pygame.K_SPACE:
        fire_bullet(ai_settings, screen, ship, bullets)


def check_keyup_events(event, ship):
    """Respond to key releases."""
    if event.key == pygame.K_RIGHT:
        ship.moving_right = False
    elif event.key == pygame.K_LEFT:
        ship.moving_left = False


def check_events(ai_settings, screen, ship, bullets):
    """Respond to keypresses and mouse events."""
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
        elif event.type == pygame.KEYDOWN:
            check_keydown_events(event, ai_settings, screen, ship, bullets)
        elif event.type == pygame.KEYUP:
            check_keyup_events(event, ship)


def fire_bullet(ai_settings, screen, ship, bullets):
    """Fire a bullet, if limit not reached yet."""
    # Create a new bullet, add to bullets group.
    if len(bullets) < ai_settings.bullets_allowed:
        new_bullet = Bullet(ai_settings, screen, ship)
        bullets.add(new_bullet)


def update_screen(ai_settings, screen, ship, bullets):
    """Update images on the screen, and flip to the new screen."""
    # Redraw the screen, each pass through the loop.
    screen.fill(ai_settings.bg_color)

    # Redraw all bullets, behind ship and aliens.
    for bullet in bullets.sprites():
        bullet.draw_bullet()
    ship.blitme()

    # Make the most recently drawn screen visible.
    pygame.display.flip()


def update_bullets(bullets):
    """Update position of bullets, and get rid of old bullets."""
    # Update bullet positions.
    bullets.update()

    # Get rid of bullets that have disappeared.
    for bullet in bullets.copy():
        if bullet.rect.bottom <= 0:
            bullets.remove(bullet)

ship.py

import pygame

class Ship():

    def __init__(self, ai_settings, screen):
        """Initialize the ship, and set its starting position."""
        self.screen = screen
        self.ai_settings = ai_settings

        # Load the ship image, and get its rect.
        self.image = pygame.image.load('images/ship.bmp')
        self.rect = self.image.get_rect()
        self.screen_rect = screen.get_rect()

        # Start each new ship at the bottom center of the screen.
        self.rect.centerx = self.screen_rect.centerx
        self.rect.bottom = self.screen_rect.bottom
        
        # Store a decimal value for the ship's center.
        self.center = float(self.rect.centerx)
        
        # Movement flags.
        self.moving_right = False
        self.moving_left = False
        
    def update(self):
        """Update the ship's position, based on movement flags."""
        # Update the ship's center value, not the rect.
        if self.moving_right and self.rect.right < self.screen_rect.right:
            self.center += self.ai_settings.ship_speed_factor
        if self.moving_left and self.rect.left > 0:
            self.center -= self.ai_settings.ship_speed_factor
            
        # Update rect object from self.center.
        self.rect.centerx = self.center

    def blitme(self):
        """Draw the ship at its current location."""
        self.screen.blit(self.image, self.rect)

请问各位这个问题该怎么解决？感谢！

Answer 1

check_evnets => check_events typo