'pygame.Surface' object has no attribute 'alien_speed'，完全按照教程写的，不知道哪错了?

Question

Traceback (most recent call last):
  File "C:\Virtual Hard Drive D\Python project\venv\ALIEN INVASION\alien_invasion.py", line 52, in <module>
    ai.run_game()
  File "C:\Virtual Hard Drive D\Python project\venv\ALIEN INVASION\alien_invasion.py", line 20, in run_game
    self.ship.update()
  File "C:\Virtual Hard Drive D\Python project\venv\ALIEN INVASION\ship.py", line 19, in update
    self.x += self.settings.ship_speed
AttributeError: 'pygame.Surface' object has no attribute 'ship_speed'

无法正常读取 setting.py 中的 ship_speed 取值，我将 ship.py 中的 self.x += self.settings.ship_speed 改成 self.x += 1 ，外星人群就可以正常右移了，请问是哪里出现问题了？

import sys
import pygame
from settings import Settings
from ship import Ship

class AlienInvasion:
    def __init__(self):
        pygame.init()   # 初始化背景设置
        self.settings = Settings()
        self.settings = pygame.display.set_mode((self.settings.screen_width,self.settings.screen_height))
        self.screen = pygame.display.set_mode((1200,800))
        pygame.display.set_caption("Alien Invasion")
        self.ship = Ship(self)
        self.bg_color = (230,230,230)

    def run_game(self):
        while True:
            self._check_events()
            self._update_screen()
            self.ship.update()

    def _check_events(self):
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                sys.exit()
            elif event.type == pygame.KEYDOWN:
                self._check_keydown_events(event)
            elif event.type == pygame.KEYUP:
                self._check_keyup_events(event)

    def _check_keydown_events(self,event):
        if event.key == pygame.K_RIGHT:
            self.ship.moving_right = True
        elif event.key == pygame.K_LEFT:
            self.ship.moving_left = True
        elif event.key == pygame.K_q:
            sys.exit()

    def _check_keyup_events(self,event):
        if event.key == pygame.K_RIGHT:
            self.ship.moving_right = False
        elif event.key == pygame.K_LEFT:
            self.ship.moving_left = False

    def _update_screen(self):
        self.screen.fill(self.bg_color)
        self.ship.blitme()
        pygame.display.flip()

if __name__ == '__main__':
     ai = AlienInvasion()
     ai.run_game()

class Settings:

    def __init__(self):
        self.screen_width = 1200
        self.screen_height = 800
        self.bg_color = (230, 230, 230)
        self.ship_speed = 1.5

class Ship:
    def __init__(self, ai_game):
        self.screen = ai_game.screen
        self.settings = ai_game.settings
        self.screen_rect = ai_game.screen.get_rect()

        self.image = pygame.image.load('images/ship.png')
        self.rect = self.image.get_rect()
        self.x = float(self.rect.x)

        self.rect.midbottom = self.screen_rect.midbottom
        self.moving_right = False
        self.moving_left = False

    def update(self):
        if self.moving_right and self.rect.right < self.screen_rect.right:
            self.x += self.settings.ship_speed
        if self.moving_left and self.rect.left > 0:
            self.x -= self.settings.ship_speed
        self.rect.x = self.x

    def blitme(self):
        self.screen.blit(self.image, self.rect)

Answer 1

class AlienInvasion:
    def __init__(self):
        pygame.init()   # 初始化背景设置
        self.settings = Settings()
        self.settings = pygame.display.set_mode((self.settings.screen_width,self.settings.screen_height))
        

self.settings被覆盖了？

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