text: import pygame
  
  class Ship:
      def __init__(self, ai_game):
          # initial settings
          self.screen = ai_game.screen
          self.settings = ai_game.settings
          self.screen_rect = ai_game.screen.get_rect()
          # load the ship
          self.image = pygame.image.load('images/ship.bmp')
          self.rect = self.image.get_rect()
  
          self.rect.midbottom = self.screen_rect.midbottom
          self.x = float(self.rect.x)
  
          self.moving_right = False
          self.moving_left = False
  
      def update(self):
          """update ship's position"""
          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)